--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/WebCore/rendering/RenderBox.cpp Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,2488 @@
+/**
+ * This file is part of the DOM implementation for KDE.
+ *
+ * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+ * (C) 1999 Antti Koivisto (koivisto@kde.org)
+ * (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
+ * (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
+ * Copyright (C) 2005 Apple Computer, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+#include "RenderBox.h"
+
+#include "CachedImage.h"
+#include "Document.h"
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "HTMLElement.h"
+#include "HTMLNames.h"
+#include "Frame.h"
+#include "RenderArena.h"
+#include "RenderFlexibleBox.h"
+#include "RenderLayer.h"
+#include "RenderTableCell.h"
+#include "RenderTheme.h"
+#include "RenderView.h"
+#include <algorithm>
+#include <math.h>
+
+using std::min;
+using std::max;
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+// Used by flexible boxes when flexing this element.
+typedef WTF::HashMap<const RenderBox*, int> OverrideSizeMap;
+static OverrideSizeMap* gOverrideSizeMap = 0;
+
+RenderBox::RenderBox(Node* node)
+ : RenderObject(node)
+ , m_width(0)
+ , m_height(0)
+ , m_x(0)
+ , m_y(0)
+ , m_marginLeft(0)
+ , m_marginRight(0)
+ , m_marginTop(0)
+ , m_marginBottom(0)
+ , m_minPrefWidth(-1)
+ , m_maxPrefWidth(-1)
+ , m_layer(0)
+ , m_inlineBoxWrapper(0)
+{
+}
+
+void RenderBox::setStyle(RenderStyle* newStyle)
+{
+ bool wasFloating = isFloating();
+ bool hadOverflowClip = hasOverflowClip();
+
+ RenderObject::setStyle(newStyle);
+
+ // The root and the RenderView always paint their backgrounds/borders.
+ if (isRoot() || isRenderView())
+ setHasBoxDecorations(true);
+
+ setInline(newStyle->isDisplayInlineType());
+
+ switch (newStyle->position()) {
+ case AbsolutePosition:
+ case FixedPosition:
+ setPositioned(true);
+ break;
+ default:
+ setPositioned(false);
+
+ if (newStyle->isFloating())
+ setFloating(true);
+
+ if (newStyle->position() == RelativePosition)
+ setRelPositioned(true);
+ }
+
+ // We also handle <body> and <html>, whose overflow applies to the viewport.
+ if (!isRoot() && (!isBody() || !document()->isHTMLDocument()) && (isRenderBlock() || isTableRow() || isTableSection())) {
+ // Check for overflow clip.
+ // It's sufficient to just check one direction, since it's illegal to have visible on only one overflow value.
+ if (newStyle->overflowX() != OVISIBLE) {
+ if (!hadOverflowClip)
+ // Erase the overflow
+ repaint();
+ setHasOverflowClip();
+ }
+ }
+
+ if (requiresLayer()) {
+ if (!m_layer) {
+ if (wasFloating && isFloating())
+ setChildNeedsLayout(true);
+ m_layer = new (renderArena()) RenderLayer(this);
+ setHasLayer(true);
+ m_layer->insertOnlyThisLayer();
+ if (parent() && !needsLayout() && containingBlock())
+ m_layer->updateLayerPositions();
+ }
+ } else if (m_layer && !isRoot() && !isRenderView()) {
+ ASSERT(m_layer->parent());
+ RenderLayer* layer = m_layer;
+ m_layer = 0;
+ setHasLayer(false);
+ layer->removeOnlyThisLayer();
+ if (wasFloating && isFloating())
+ setChildNeedsLayout(true);
+ }
+
+ if (m_layer)
+ m_layer->styleChanged();
+
+ // Set the text color if we're the body.
+ if (isBody())
+ document()->setTextColor(newStyle->color());
+
+ if (style()->outlineWidth() > 0 && style()->outlineSize() > maximalOutlineSize(PaintPhaseOutline))
+ static_cast<RenderView*>(document()->renderer())->setMaximalOutlineSize(style()->outlineSize());
+}
+
+RenderBox::~RenderBox()
+{
+}
+
+void RenderBox::destroy()
+{
+ // A lot of the code in this funtion is just pasted into
+ // RenderWidget::destroy. If anything in this function changes,
+ // be sure to fix RenderWidget::destroy() as well.
+
+ if (hasOverrideSize())
+ gOverrideSizeMap->remove(this);
+
+ RenderLayer* layer = m_layer;
+ RenderArena* arena = renderArena();
+
+ // This must be done before we destroy the RenderObject.
+ if (layer)
+ layer->clearClipRect();
+
+ RenderObject::destroy();
+
+ if (layer)
+ layer->destroy(arena);
+}
+
+int RenderBox::minPrefWidth() const
+{
+ if (prefWidthsDirty())
+ const_cast<RenderBox*>(this)->calcPrefWidths();
+
+ return m_minPrefWidth;
+}
+
+int RenderBox::maxPrefWidth() const
+{
+ if (prefWidthsDirty())
+ const_cast<RenderBox*>(this)->calcPrefWidths();
+
+ return m_maxPrefWidth;
+}
+
+int RenderBox::overrideSize() const
+{
+ if (!hasOverrideSize())
+ return -1;
+ return gOverrideSizeMap->get(this);
+}
+
+void RenderBox::setOverrideSize(int s)
+{
+ if (s == -1) {
+ if (hasOverrideSize()) {
+ setHasOverrideSize(false);
+ gOverrideSizeMap->remove(this);
+ }
+ } else {
+ if (!gOverrideSizeMap)
+ gOverrideSizeMap = new OverrideSizeMap();
+ setHasOverrideSize(true);
+ gOverrideSizeMap->set(this, s);
+ }
+}
+
+int RenderBox::overrideWidth() const
+{
+ return hasOverrideSize() ? overrideSize() : m_width;
+}
+
+int RenderBox::overrideHeight() const
+{
+ return hasOverrideSize() ? overrideSize() : m_height;
+}
+
+void RenderBox::setPos(int xPos, int yPos)
+{
+ // Optimize for the case where we don't move at all.
+ if (xPos == m_x && yPos == m_y)
+ return;
+
+ m_x = xPos;
+ m_y = yPos;
+}
+
+int RenderBox::calcBorderBoxWidth(int width) const
+{
+ int bordersPlusPadding = borderLeft() + borderRight() + paddingLeft() + paddingRight();
+ if (style()->boxSizing() == CONTENT_BOX)
+ return width + bordersPlusPadding;
+ return max(width, bordersPlusPadding);
+}
+
+int RenderBox::calcBorderBoxHeight(int height) const
+{
+ int bordersPlusPadding = borderTop() + borderBottom() + paddingTop() + paddingBottom();
+ if (style()->boxSizing() == CONTENT_BOX)
+ return height + bordersPlusPadding;
+ return max(height, bordersPlusPadding);
+}
+
+int RenderBox::calcContentBoxWidth(int width) const
+{
+ if (style()->boxSizing() == BORDER_BOX)
+ width -= (borderLeft() + borderRight() + paddingLeft() + paddingRight());
+ return max(0, width);
+}
+
+int RenderBox::calcContentBoxHeight(int height) const
+{
+ if (style()->boxSizing() == BORDER_BOX)
+ height -= (borderTop() + borderBottom() + paddingTop() + paddingBottom());
+ return max(0, height);
+}
+
+// Hit Testing
+bool RenderBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction action)
+{
+ tx += m_x;
+ ty += m_y;
+
+ // Check kids first.
+ for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
+ // FIXME: We have to skip over inline flows, since they can show up inside table rows
+ // at the moment (a demoted inline <form> for example). If we ever implement a
+ // table-specific hit-test method (which we should do for performance reasons anyway),
+ // then we can remove this check.
+ if (!child->hasLayer() && !child->isInlineFlow() && child->nodeAtPoint(request, result, x, y, tx, ty, action)) {
+ updateHitTestResult(result, IntPoint(x - tx, y - ty));
+ return true;
+ }
+ }
+
+ // Check our bounds next. For this purpose always assume that we can only be hit in the
+ // foreground phase (which is true for replaced elements like images).
+ if (action == HitTestForeground && IntRect(tx, ty, m_width, m_height).contains(x, y)) {
+ updateHitTestResult(result, IntPoint(x - tx, y - ty));
+ return true;
+ }
+
+ return false;
+}
+
+// --------------------- painting stuff -------------------------------
+
+void RenderBox::paint(PaintInfo& paintInfo, int tx, int ty)
+{
+ tx += m_x;
+ ty += m_y;
+
+ // default implementation. Just pass paint through to the children
+ PaintInfo childInfo(paintInfo);
+ childInfo.paintingRoot = paintingRootForChildren(paintInfo);
+ for (RenderObject* child = firstChild(); child; child = child->nextSibling())
+ child->paint(childInfo, tx, ty);
+}
+
+void RenderBox::paintRootBoxDecorations(PaintInfo& paintInfo, int tx, int ty)
+{
+ const BackgroundLayer* bgLayer = style()->backgroundLayers();
+ Color bgColor = style()->backgroundColor();
+ if (document()->isHTMLDocument() && !style()->hasBackground()) {
+ // Locate the <body> element using the DOM. This is easier than trying
+ // to crawl around a render tree with potential :before/:after content and
+ // anonymous blocks created by inline <body> tags etc. We can locate the <body>
+ // render object very easily via the DOM.
+ HTMLElement* body = document()->body();
+ RenderObject* bodyObject = (body && body->hasLocalName(bodyTag)) ? body->renderer() : 0;
+ if (bodyObject) {
+ bgLayer = bodyObject->style()->backgroundLayers();
+ bgColor = bodyObject->style()->backgroundColor();
+ }
+ }
+
+ int w = width();
+ int h = height();
+
+ int rw;
+ int rh;
+ if (view()->frameView()) {
+ rw = view()->frameView()->contentsWidth();
+ rh = view()->frameView()->contentsHeight();
+ } else {
+ rw = view()->width();
+ rh = view()->height();
+ }
+
+ int bx = tx - marginLeft();
+ int by = ty - marginTop();
+ int bw = max(w + marginLeft() + marginRight() + borderLeft() + borderRight(), rw);
+ int bh = max(h + marginTop() + marginBottom() + borderTop() + borderBottom(), rh);
+
+ // CSS2 14.2:
+ // " The background of the box generated by the root element covers the entire canvas."
+ // hence, paint the background even in the margin areas (unlike for every other element!)
+ // I just love these little inconsistencies .. :-( (Dirk)
+ int my = max(by, paintInfo.rect.y());
+
+ paintBackgrounds(paintInfo.context, bgColor, bgLayer, my, paintInfo.rect.height(), bx, by, bw, bh);
+
+ if (style()->hasBorder() && style()->display() != INLINE)
+ paintBorder(paintInfo.context, tx, ty, w, h, style());
+}
+
+void RenderBox::paintBoxDecorations(PaintInfo& paintInfo, int tx, int ty)
+{
+ if (!shouldPaintWithinRoot(paintInfo))
+ return;
+
+ if (isRoot()) {
+ paintRootBoxDecorations(paintInfo, tx, ty);
+ return;
+ }
+
+ int w = width();
+ int h = height() + borderTopExtra() + borderBottomExtra();
+ ty -= borderTopExtra();
+
+ // border-fit can adjust where we paint our border and background. If set, we snugly fit our line box descendants. (The iChat
+ // balloon layout is an example of this).
+ borderFitAdjust(tx, w);
+
+ int my = max(ty, paintInfo.rect.y());
+ int mh;
+ if (ty < paintInfo.rect.y())
+ mh = max(0, h - (paintInfo.rect.y() - ty));
+ else
+ mh = min(paintInfo.rect.height(), h);
+
+ // FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
+ // custom shadows of their own.
+ paintBoxShadow(paintInfo.context, tx, ty, w, h, style());
+
+ // If we have a native theme appearance, paint that before painting our background.
+ // The theme will tell us whether or not we should also paint the CSS background.
+ bool themePainted = style()->hasAppearance() && !theme()->paint(this, paintInfo, IntRect(tx, ty, w, h));
+ if (!themePainted) {
+ // The <body> only paints its background if the root element has defined a background
+ // independent of the body. Go through the DOM to get to the root element's render object,
+ // since the root could be inline and wrapped in an anonymous block.
+ if (!isBody() || !document()->isHTMLDocument() || document()->documentElement()->renderer()->style()->hasBackground())
+ paintBackgrounds(paintInfo.context, style()->backgroundColor(), style()->backgroundLayers(), my, mh, tx, ty, w, h);
+ if (style()->hasAppearance())
+ theme()->paintDecorations(this, paintInfo, IntRect(tx, ty, w, h));
+ }
+
+ // The theme will tell us whether or not we should also paint the CSS border.
+ if ((!style()->hasAppearance() || (!themePainted && theme()->paintBorderOnly(this, paintInfo, IntRect(tx, ty, w, h)))) && style()->hasBorder())
+ paintBorder(paintInfo.context, tx, ty, w, h, style());
+}
+
+void RenderBox::paintBackgrounds(GraphicsContext* context, const Color& c, const BackgroundLayer* bgLayer,
+ int clipY, int clipH, int tx, int ty, int width, int height)
+{
+ if (!bgLayer)
+ return;
+
+ paintBackgrounds(context, c, bgLayer->next(), clipY, clipH, tx, ty, width, height);
+ paintBackground(context, c, bgLayer, clipY, clipH, tx, ty, width, height);
+}
+
+void RenderBox::paintBackground(GraphicsContext* context, const Color& c, const BackgroundLayer* bgLayer,
+ int clipY, int clipH, int tx, int ty, int width, int height)
+{
+ paintBackgroundExtended(context, c, bgLayer, clipY, clipH, tx, ty, width, height);
+}
+
+static void cacluateBackgroundSize(const BackgroundLayer* bgLayer, int& scaledWidth, int& scaledHeight)
+{
+ CachedImage* bg = bgLayer->backgroundImage();
+
+ if (bgLayer->isBackgroundSizeSet()) {
+ Length bgWidth = bgLayer->backgroundSize().width;
+ Length bgHeight = bgLayer->backgroundSize().height;
+
+ if (bgWidth.isPercent())
+ scaledWidth = bgWidth.calcValue(scaledWidth);
+ else if (bgWidth.isFixed())
+ scaledWidth = bgWidth.value();
+ else if (bgWidth.isAuto()) {
+ // If the width is auto and the height is not, we have to use the appropriate
+ // scale to maintain our aspect ratio.
+ if (bgHeight.isPercent()) {
+ int scaledH = bgHeight.calcValue(scaledHeight);
+ scaledWidth = bg->imageSize().width() * scaledH / bg->imageSize().height();
+ } else if (bgHeight.isFixed())
+ scaledWidth = bg->imageSize().width() * bgHeight.value() / bg->imageSize().height();
+ }
+
+ if (bgHeight.isPercent())
+ scaledHeight = bgHeight.calcValue(scaledHeight);
+ else if (bgHeight.isFixed())
+ scaledHeight = bgHeight.value();
+ else if (bgHeight.isAuto()) {
+ // If the height is auto and the width is not, we have to use the appropriate
+ // scale to maintain our aspect ratio.
+ if (bgWidth.isPercent())
+ scaledHeight = bg->imageSize().height() * scaledWidth / bg->imageSize().width();
+ else if (bgWidth.isFixed())
+ scaledHeight = bg->imageSize().height() * bgWidth.value() / bg->imageSize().width();
+ else if (bgWidth.isAuto()) {
+ // If both width and height are auto, we just want to use the image's
+ // intrinsic size.
+ scaledWidth = bg->imageSize().width();
+ scaledHeight = bg->imageSize().height();
+ }
+ }
+ } else {
+ scaledWidth = bg->imageSize().width();
+ scaledHeight = bg->imageSize().height();
+ }
+}
+
+void RenderBox::imageChanged(CachedImage* image)
+{
+ if (!image || !image->canRender() || !parent() || !view())
+ return;
+
+ if (isInlineFlow() || style()->borderImage().image() == image) {
+ repaint();
+ return;
+ }
+
+ bool didFullRepaint = false;
+ IntRect absoluteRect;
+ RenderBox* backgroundRenderer;
+
+ if (isRoot() || (isBody() && document()->isHTMLDocument() && !document()->documentElement()->renderer()->style()->hasBackground())) {
+ // Our background propagates to the root.
+ backgroundRenderer = view();
+
+ int rw;
+ int rh;
+
+ if (FrameView* frameView = static_cast<RenderView*>(backgroundRenderer)->frameView()) {
+ rw = frameView->contentsWidth();
+ rh = frameView->contentsHeight();
+ } else {
+ rw = backgroundRenderer->width();
+ rh = backgroundRenderer->height();
+ }
+ absoluteRect = IntRect(-backgroundRenderer->marginLeft(),
+ -backgroundRenderer->marginTop(),
+ max(backgroundRenderer->width() + backgroundRenderer->marginLeft() + backgroundRenderer->marginRight() + backgroundRenderer->borderLeft() + backgroundRenderer->borderRight(), rw),
+ max(backgroundRenderer->height() + backgroundRenderer->marginTop() + backgroundRenderer->marginBottom() + backgroundRenderer->borderTop() + backgroundRenderer->borderBottom(), rh));
+ } else {
+ backgroundRenderer = this;
+ absoluteRect = borderBox();
+ }
+
+ backgroundRenderer->computeAbsoluteRepaintRect(absoluteRect);
+
+ for (const BackgroundLayer* bgLayer = style()->backgroundLayers(); bgLayer && !didFullRepaint; bgLayer = bgLayer->next()) {
+ if (image == bgLayer->backgroundImage()) {
+ IntRect repaintRect;
+ IntPoint phase;
+ IntSize tileSize;
+ backgroundRenderer->calculateBackgroundImageGeometry(bgLayer, absoluteRect.x(), absoluteRect.y(), absoluteRect.width(), absoluteRect.height(), repaintRect, phase, tileSize);
+ view()->repaintViewRectangle(repaintRect);
+ if (repaintRect == absoluteRect)
+ didFullRepaint = true;
+ }
+ }
+}
+
+void RenderBox::calculateBackgroundImageGeometry(const BackgroundLayer* bgLayer, int tx, int ty, int w, int h, IntRect& destRect, IntPoint& phase, IntSize& tileSize)
+{
+ int pw;
+ int ph;
+ int left = 0;
+ int right = 0;
+ int top = 0;
+ int bottom = 0;
+ int cx;
+ int cy;
+
+ // CSS2 chapter 14.2.1
+
+ if (bgLayer->backgroundAttachment()) {
+ // Scroll
+ if (bgLayer->backgroundOrigin() != BGBORDER) {
+ left = borderLeft();
+ right = borderRight();
+ top = borderTop();
+ bottom = borderBottom();
+ if (bgLayer->backgroundOrigin() == BGCONTENT) {
+ left += paddingLeft();
+ right += paddingRight();
+ top += paddingTop();
+ bottom += paddingBottom();
+ }
+ }
+ cx = tx;
+ cy = ty;
+ pw = w - left - right;
+ ph = h - top - bottom;
+ } else {
+ // Fixed
+ IntRect vr = viewRect();
+ cx = vr.x();
+ cy = vr.y();
+ pw = vr.width();
+ ph = vr.height();
+ }
+
+ int sx = 0;
+ int sy = 0;
+ int cw;
+ int ch;
+ int scaledImageWidth = pw;
+ int scaledImageHeight = ph;
+
+ cacluateBackgroundSize(bgLayer, scaledImageWidth, scaledImageHeight);
+
+ EBackgroundRepeat backgroundRepeat = bgLayer->backgroundRepeat();
+
+ int xPosition = bgLayer->backgroundXPosition().calcMinValue(pw - scaledImageWidth);
+ if (backgroundRepeat == REPEAT || backgroundRepeat == REPEAT_X) {
+ cw = pw + left + right;
+ sx = scaledImageWidth ? scaledImageWidth - (xPosition + left) % scaledImageWidth : 0;
+ } else {
+ cx += max(xPosition + left, 0);
+ sx = -min(xPosition + left, 0);
+ cw = scaledImageWidth + min(xPosition + left, 0);
+ }
+
+ int yPosition = bgLayer->backgroundYPosition().calcMinValue(ph - scaledImageHeight);
+ if (backgroundRepeat == REPEAT || backgroundRepeat == REPEAT_Y) {
+ ch = ph + top + bottom;
+ sy = scaledImageHeight ? scaledImageHeight - (yPosition + top) % scaledImageHeight : 0;
+ } else {
+ cy += max(yPosition + top, 0);
+ sy = -min(yPosition + top, 0);
+ ch = scaledImageHeight + min(yPosition + top, 0);
+ }
+
+ if (!bgLayer->backgroundAttachment()) {
+ sx += max(tx - cx, 0);
+ sy += max(ty - cy, 0);
+ }
+
+ destRect = IntRect(cx, cy, cw, ch);
+ destRect.intersect(IntRect(tx, ty, w, h));
+ phase = IntPoint(sx, sy);
+ tileSize = IntSize(scaledImageWidth, scaledImageHeight);
+}
+
+void RenderBox::paintBackgroundExtended(GraphicsContext* context, const Color& c, const BackgroundLayer* bgLayer, int clipY, int clipH,
+ int tx, int ty, int w, int h, bool includeLeftEdge, bool includeRightEdge)
+{
+ int bLeft = includeLeftEdge ? borderLeft() : 0;
+ int bRight = includeRightEdge ? borderRight() : 0;
+ int pLeft = includeLeftEdge ? paddingLeft() : 0;
+ int pRight = includeRightEdge ? paddingRight() : 0;
+
+ bool clippedToBorderRadius = false;
+ if (style()->hasBorderRadius() && (includeLeftEdge || includeRightEdge)) {
+ context->save();
+ context->addRoundedRectClip(IntRect(tx, ty, w, h),
+ includeLeftEdge ? style()->borderTopLeftRadius() : IntSize(),
+ includeRightEdge ? style()->borderTopRightRadius() : IntSize(),
+ includeLeftEdge ? style()->borderBottomLeftRadius() : IntSize(),
+ includeRightEdge ? style()->borderBottomRightRadius() : IntSize());
+ clippedToBorderRadius = true;
+ }
+
+ if (bgLayer->backgroundClip() != BGBORDER) {
+ // Clip to the padding or content boxes as necessary.
+ bool includePadding = bgLayer->backgroundClip() == BGCONTENT;
+ int x = tx + bLeft + (includePadding ? pLeft : 0);
+ int y = ty + borderTop() + (includePadding ? paddingTop() : 0);
+ int width = w - bLeft - bRight - (includePadding ? pLeft + pRight : 0);
+ int height = h - borderTop() - borderBottom() - (includePadding ? paddingTop() + paddingBottom() : 0);
+ context->save();
+ context->clip(IntRect(x, y, width, height));
+ }
+
+ CachedImage* bg = bgLayer->backgroundImage();
+ bool shouldPaintBackgroundImage = bg && bg->canRender();
+ Color bgColor = c;
+
+ // When this style flag is set, change existing background colors and images to a solid white background.
+ // If there's no bg color or image, leave it untouched to avoid affecting transparency.
+ // We don't try to avoid loading the background images, because this style flag is only set
+ // when printing, and at that point we've already loaded the background images anyway. (To avoid
+ // loading the background images we'd have to do this check when applying styles rather than
+ // while rendering.)
+ if (style()->forceBackgroundsToWhite()) {
+ // Note that we can't reuse this variable below because the bgColor might be changed
+ bool shouldPaintBackgroundColor = !bgLayer->next() && bgColor.isValid() && bgColor.alpha() > 0;
+ if (shouldPaintBackgroundImage || shouldPaintBackgroundColor) {
+ bgColor = Color::white;
+ shouldPaintBackgroundImage = false;
+ }
+ }
+
+ // Only fill with a base color (e.g., white) if we're the root document, since iframes/frames with
+ // no background in the child document should show the parent's background.
+ bool isTransparent = false;
+ if (!bgLayer->next() && isRoot() && !(bgColor.isValid() && bgColor.alpha() > 0) && view()->frameView()) {
+ Node* elt = document()->ownerElement();
+ if (elt) {
+ if (!elt->hasTagName(frameTag)) {
+ // Locate the <body> element using the DOM. This is easier than trying
+ // to crawl around a render tree with potential :before/:after content and
+ // anonymous blocks created by inline <body> tags etc. We can locate the <body>
+ // render object very easily via the DOM.
+ HTMLElement* body = document()->body();
+ isTransparent = !body || !body->hasLocalName(framesetTag); // Can't scroll a frameset document anyway.
+ }
+ } else
+ isTransparent = view()->frameView()->isTransparent();
+
+ if (isTransparent)
+ view()->frameView()->setUseSlowRepaints(); // The parent must show behind the child.
+ }
+
+ // Paint the color first underneath all images.
+ if (!bgLayer->next()) {
+ IntRect rect(tx, clipY, w, clipH);
+ // If we have an alpha and we are painting the root element, go ahead and blend with the base background color.
+ if (isRoot() && (!bgColor.isValid() || bgColor.alpha() < 0xFF) && !isTransparent) {
+ Color baseColor = view()->frameView()->baseBackgroundColor();
+ if (baseColor.alpha() > 0) {
+ context->save();
+ context->setCompositeOperation(CompositeCopy);
+ context->fillRect(rect, baseColor);
+ context->restore();
+ } else
+ context->clearRect(rect);
+ }
+
+ if (bgColor.isValid() && bgColor.alpha() > 0)
+ context->fillRect(rect, bgColor);
+ }
+
+ // no progressive loading of the background image
+ if (shouldPaintBackgroundImage) {
+ IntRect destRect;
+ IntPoint phase;
+ IntSize tileSize;
+
+ calculateBackgroundImageGeometry(bgLayer, tx, ty, w, h, destRect, phase, tileSize);
+ if (!destRect.isEmpty())
+ context->drawTiledImage(bg->image(), destRect, phase, tileSize, bgLayer->backgroundComposite());
+ }
+
+ if (bgLayer->backgroundClip() != BGBORDER)
+ // Undo the background clip
+ context->restore();
+
+ if (clippedToBorderRadius)
+ // Undo the border radius clip
+ context->restore();
+}
+
+#if PLATFORM(MAC)
+void RenderBox::paintCustomHighlight(int tx, int ty, const AtomicString& type, bool behindText)
+{
+ InlineBox* boxWrap = inlineBoxWrapper();
+ RootInlineBox* r = boxWrap ? boxWrap->root() : 0;
+ if (r) {
+ FloatRect rootRect(tx + r->xPos(), ty + r->selectionTop(), r->width(), r->selectionHeight());
+ FloatRect imageRect(tx + m_x, rootRect.y(), width(), rootRect.height());
+ document()->frame()->paintCustomHighlight(type, imageRect, rootRect, behindText, false, node());
+ } else {
+ FloatRect imageRect(tx + m_x, ty + m_y, width(), height());
+ document()->frame()->paintCustomHighlight(type, imageRect, imageRect, behindText, false, node());
+ }
+}
+#endif
+
+IntRect RenderBox::getOverflowClipRect(int tx, int ty)
+{
+ // FIXME: When overflow-clip (CSS3) is implemented, we'll obtain the property
+ // here.
+
+ int bLeft = borderLeft();
+ int bTop = borderTop();
+
+ int clipX = tx + bLeft;
+ int clipY = ty + bTop;
+ int clipWidth = m_width - bLeft - borderRight();
+ int clipHeight = m_height - bTop - borderBottom() + borderTopExtra() + borderBottomExtra();
+
+ // Subtract out scrollbars if we have them.
+ if (m_layer) {
+ clipWidth -= m_layer->verticalScrollbarWidth();
+ clipHeight -= m_layer->horizontalScrollbarHeight();
+ }
+
+ return IntRect(clipX, clipY, clipWidth, clipHeight);
+}
+
+IntRect RenderBox::getClipRect(int tx, int ty)
+{
+ int clipX = tx;
+ int clipY = ty;
+ int clipWidth = m_width;
+ int clipHeight = m_height;
+
+ if (!style()->clipLeft().isAuto()) {
+ int c = style()->clipLeft().calcValue(m_width);
+ clipX += c;
+ clipWidth -= c;
+ }
+
+ if (!style()->clipRight().isAuto())
+ clipWidth -= m_width - style()->clipRight().calcValue(m_width);
+
+ if (!style()->clipTop().isAuto()) {
+ int c = style()->clipTop().calcValue(m_height);
+ clipY += c;
+ clipHeight -= c;
+ }
+
+ if (!style()->clipBottom().isAuto())
+ clipHeight -= m_height - style()->clipBottom().calcValue(m_height);
+
+ return IntRect(clipX, clipY, clipWidth, clipHeight);
+}
+
+int RenderBox::containingBlockWidth() const
+{
+ RenderBlock* cb = containingBlock();
+ if (!cb)
+ return 0;
+ if (shrinkToAvoidFloats())
+ return cb->lineWidth(m_y);
+ return cb->availableWidth();
+}
+
+IntSize RenderBox::offsetForPositionedInContainer(RenderObject* container) const
+{
+ if (!container->isRelPositioned() || !container->isInlineFlow())
+ return IntSize();
+
+ // When we have an enclosing relpositioned inline, we need to add in the offset of the first line
+ // box from the rest of the content, but only in the cases where we know we're positioned
+ // relative to the inline itself.
+
+ IntSize offset;
+ RenderFlow* flow = static_cast<RenderFlow*>(container);
+ int sx;
+ int sy;
+ if (flow->firstLineBox()) {
+ sx = flow->firstLineBox()->xPos();
+ sy = flow->firstLineBox()->yPos();
+ } else {
+ sx = flow->staticX();
+ sy = flow->staticY();
+ }
+
+ if (!hasStaticX())
+ offset.setWidth(sx);
+ // This is not terribly intuitive, but we have to match other browsers. Despite being a block display type inside
+ // an inline, we still keep our x locked to the left of the relative positioned inline. Arguably the correct
+ // behavior would be to go flush left to the block that contains the inline, but that isn't what other browsers
+ // do.
+ else if (!style()->isOriginalDisplayInlineType())
+ // Avoid adding in the left border/padding of the containing block twice. Subtract it out.
+ offset.setWidth(sx - (containingBlock()->borderLeft() + containingBlock()->paddingLeft()));
+
+ if (!hasStaticY())
+ offset.setHeight(sy);
+
+ return offset;
+}
+
+bool RenderBox::absolutePosition(int& xPos, int& yPos, bool fixed) const
+{
+ if (RenderView* v = view()) {
+ if (LayoutState* layoutState = v->layoutState()) {
+ xPos = layoutState->m_offset.width() + m_x;
+ yPos = layoutState->m_offset.height() + m_y;
+ return true;
+ }
+ }
+
+ if (style()->position() == FixedPosition)
+ fixed = true;
+
+ RenderObject* o = container();
+ if (o && o->absolutePosition(xPos, yPos, fixed)) {
+ yPos += o->borderTopExtra();
+
+ if (style()->position() == AbsolutePosition) {
+ IntSize offset = offsetForPositionedInContainer(o);
+ xPos += offset.width();
+ yPos += offset.height();
+ }
+
+ if (o->hasOverflowClip())
+ o->layer()->subtractScrollOffset(xPos, yPos);
+
+ if (!isInline() || isReplaced()) {
+ RenderBlock* cb;
+ if (o->isBlockFlow() && style()->position() != AbsolutePosition && style()->position() != FixedPosition
+ && (cb = static_cast<RenderBlock*>(o))->hasColumns()) {
+ IntRect rect(m_x, m_y, 1, 1);
+ cb->adjustRectForColumns(rect);
+ xPos += rect.x();
+ yPos += rect.y();
+ } else {
+ xPos += m_x;
+ yPos += m_y;
+ }
+ }
+
+ if (isRelPositioned()) {
+ xPos += relativePositionOffsetX();
+ yPos += relativePositionOffsetY();
+ }
+
+ return true;
+ } else {
+ xPos = 0;
+ yPos = 0;
+ return false;
+ }
+}
+
+void RenderBox::dirtyLineBoxes(bool fullLayout, bool /*isRootLineBox*/)
+{
+ if (m_inlineBoxWrapper) {
+ if (fullLayout) {
+ m_inlineBoxWrapper->destroy(renderArena());
+ m_inlineBoxWrapper = 0;
+ } else
+ m_inlineBoxWrapper->dirtyLineBoxes();
+ }
+}
+
+void RenderBox::position(InlineBox* box)
+{
+ if (isPositioned()) {
+ // Cache the x position only if we were an INLINE type originally.
+ bool wasInline = style()->isOriginalDisplayInlineType();
+ if (wasInline && hasStaticX()) {
+ // The value is cached in the xPos of the box. We only need this value if
+ // our object was inline originally, since otherwise it would have ended up underneath
+ // the inlines.
+ setStaticX(box->xPos());
+ setChildNeedsLayout(true, false); // Just go ahead and mark the positioned object as needing layout, so it will update its position properly.
+ } else if (!wasInline && hasStaticY()) {
+ // Our object was a block originally, so we make our normal flow position be
+ // just below the line box (as though all the inlines that came before us got
+ // wrapped in an anonymous block, which is what would have happened had we been
+ // in flow). This value was cached in the yPos() of the box.
+ setStaticY(box->yPos());
+ setChildNeedsLayout(true, false); // Just go ahead and mark the positioned object as needing layout, so it will update its position properly.
+ }
+
+ // Nuke the box.
+ box->remove();
+ box->destroy(renderArena());
+ } else if (isReplaced()) {
+ m_x = box->xPos();
+ m_y = box->yPos();
+ m_inlineBoxWrapper = box;
+ }
+}
+
+void RenderBox::deleteLineBoxWrapper()
+{
+ if (m_inlineBoxWrapper) {
+ if (!documentBeingDestroyed())
+ m_inlineBoxWrapper->remove();
+ m_inlineBoxWrapper->destroy(renderArena());
+ m_inlineBoxWrapper = 0;
+ }
+}
+
+IntRect RenderBox::absoluteClippedOverflowRect()
+{
+ IntRect r = overflowRect(false);
+
+ if (RenderView* v = view())
+ r.move(v->layoutDelta());
+
+ if (style()) {
+ if (style()->hasAppearance())
+ // The theme may wish to inflate the rect used when repainting.
+ theme()->adjustRepaintRect(this, r);
+
+ // FIXME: Technically the outline inflation could fit within the theme inflation.
+ if (!isInline() && continuation())
+ r.inflate(continuation()->style()->outlineSize());
+ else
+ r.inflate(style()->outlineSize());
+ }
+ computeAbsoluteRepaintRect(r);
+ return r;
+}
+
+void RenderBox::computeAbsoluteRepaintRect(IntRect& rect, bool fixed)
+{
+ if (RenderView* v = view()) {
+ if (LayoutState* layoutState = v->layoutState()) {
+ rect.move(m_x, m_y);
+ rect.move(layoutState->m_offset);
+ if (layoutState->m_clipped)
+ rect.intersect(layoutState->m_clipRect);
+ return;
+ }
+ }
+
+ int x = rect.x() + m_x;
+ int y = rect.y() + m_y;
+
+ // Apply the relative position offset when invalidating a rectangle. The layer
+ // is translated, but the render box isn't, so we need to do this to get the
+ // right dirty rect. Since this is called from RenderObject::setStyle, the relative position
+ // flag on the RenderObject has been cleared, so use the one on the style().
+ if (style()->position() == RelativePosition && m_layer)
+ m_layer->relativePositionOffset(x, y);
+
+ if (style()->position() == FixedPosition)
+ fixed = true;
+
+ RenderObject* o = container();
+ if (o) {
+ if (o->isBlockFlow() && style()->position() != AbsolutePosition && style()->position() != FixedPosition) {
+ RenderBlock* cb = static_cast<RenderBlock*>(o);
+ if (cb->hasColumns()) {
+ IntRect repaintRect(x, y, rect.width(), rect.height());
+ cb->adjustRectForColumns(repaintRect);
+ x = repaintRect.x();
+ y = repaintRect.y();
+ rect = repaintRect;
+ }
+ }
+
+ if (style()->position() == AbsolutePosition) {
+ IntSize offset = offsetForPositionedInContainer(o);
+ x += offset.width();
+ y += offset.height();
+ }
+
+ // FIXME: We ignore the lightweight clipping rect that controls use, since if |o| is in mid-layout,
+ // its controlClipRect will be wrong. For overflow clip we use the values cached by the layer.
+ if (o->hasOverflowClip()) {
+ // o->height() is inaccurate if we're in the middle of a layout of |o|, so use the
+ // layer's size instead. Even if the layer's size is wrong, the layer itself will repaint
+ // anyway if its size does change.
+ IntRect boxRect(0, 0, o->layer()->width(), o->layer()->height());
+ o->layer()->subtractScrollOffset(x, y); // For overflow:auto/scroll/hidden.
+ IntRect repaintRect(x, y, rect.width(), rect.height());
+ rect = intersection(repaintRect, boxRect);
+ if (rect.isEmpty())
+ return;
+ } else {
+ rect.setX(x);
+ rect.setY(y);
+ }
+ o->computeAbsoluteRepaintRect(rect, fixed);
+ }
+}
+
+void RenderBox::repaintDuringLayoutIfMoved(const IntRect& rect)
+{
+ int newX = m_x;
+ int newY = m_y;
+ int newWidth = m_width;
+ int newHeight = m_height;
+ if (rect.x() != newX || rect.y() != newY) {
+ // The child moved. Invalidate the object's old and new positions. We have to do this
+ // since the object may not have gotten a layout.
+ m_x = rect.x();
+ m_y = rect.y();
+ m_width = rect.width();
+ m_height = rect.height();
+ repaint();
+ repaintOverhangingFloats(true);
+
+ m_x = newX;
+ m_y = newY;
+ m_width = newWidth;
+ m_height = newHeight;
+ repaint();
+ repaintOverhangingFloats(true);
+ }
+}
+
+int RenderBox::relativePositionOffsetX() const
+{
+ if (!style()->left().isAuto()) {
+ if (!style()->right().isAuto() && containingBlock()->style()->direction() == RTL)
+ return -style()->right().calcValue(containingBlockWidth());
+ return style()->left().calcValue(containingBlockWidth());
+ }
+ if (!style()->right().isAuto())
+ return -style()->right().calcValue(containingBlockWidth());
+ return 0;
+}
+
+int RenderBox::relativePositionOffsetY() const
+{
+ if (!style()->top().isAuto()) {
+ if (!style()->top().isPercent() || containingBlock()->style()->height().isFixed())
+ return style()->top().calcValue(containingBlockHeight());
+ } else if (!style()->bottom().isAuto()) {
+ if (!style()->bottom().isPercent() || containingBlock()->style()->height().isFixed())
+ return -style()->bottom().calcValue(containingBlockHeight());
+ }
+ return 0;
+}
+
+void RenderBox::calcWidth()
+{
+ if (isPositioned()) {
+ calcAbsoluteHorizontal();
+ return;
+ }
+
+ // If layout is limited to a subtree, the subtree root's width does not change.
+ if (node() && view()->frameView() && view()->frameView()->layoutRoot() == node())
+ return;
+
+ // The parent box is flexing us, so it has increased or decreased our
+ // width. Use the width from the style context.
+ if (hasOverrideSize() && parent()->style()->boxOrient() == HORIZONTAL
+ && parent()->isFlexibleBox() && parent()->isFlexingChildren()) {
+ m_width = overrideSize();
+ return;
+ }
+
+ bool inVerticalBox = parent()->isFlexibleBox() && (parent()->style()->boxOrient() == VERTICAL);
+ bool stretching = (parent()->style()->boxAlign() == BSTRETCH);
+ bool treatAsReplaced = isReplaced() && !isInlineBlockOrInlineTable() && (!inVerticalBox || !stretching);
+
+ Length width = (treatAsReplaced) ? Length(calcReplacedWidth(), Fixed) : style()->width();
+
+ RenderBlock* cb = containingBlock();
+ int containerWidth = max(0, containingBlockWidth());
+
+ Length marginLeft = style()->marginLeft();
+ Length marginRight = style()->marginRight();
+
+ if (isInline() && !isInlineBlockOrInlineTable()) {
+ // just calculate margins
+ m_marginLeft = marginLeft.calcMinValue(containerWidth);
+ m_marginRight = marginRight.calcMinValue(containerWidth);
+ if (treatAsReplaced)
+ m_width = max(width.value() + borderLeft() + borderRight() + paddingLeft() + paddingRight(), minPrefWidth());
+
+ return;
+ }
+
+ // Width calculations
+ if (treatAsReplaced)
+ m_width = width.value() + borderLeft() + borderRight() + paddingLeft() + paddingRight();
+ else {
+ // Calculate Width
+ m_width = calcWidthUsing(Width, containerWidth);
+
+ // Calculate MaxWidth
+ if (!style()->maxWidth().isUndefined()) {
+ int maxW = calcWidthUsing(MaxWidth, containerWidth);
+ if (m_width > maxW) {
+ m_width = maxW;
+ width = style()->maxWidth();
+ }
+ }
+
+ // Calculate MinWidth
+ int minW = calcWidthUsing(MinWidth, containerWidth);
+ if (m_width < minW) {
+ m_width = minW;
+ width = style()->minWidth();
+ }
+ }
+
+ if (stretchesToMinIntrinsicWidth()) {
+ m_width = max(m_width, minPrefWidth());
+ width = Length(m_width, Fixed);
+ }
+
+ // Margin calculations
+ if (width.isAuto()) {
+ m_marginLeft = marginLeft.calcMinValue(containerWidth);
+ m_marginRight = marginRight.calcMinValue(containerWidth);
+ } else {
+ m_marginLeft = 0;
+ m_marginRight = 0;
+ calcHorizontalMargins(marginLeft, marginRight, containerWidth);
+ }
+
+ if (containerWidth && containerWidth != (m_width + m_marginLeft + m_marginRight)
+ && !isFloating() && !isInline() && !cb->isFlexibleBox()) {
+ if (cb->style()->direction() == LTR)
+ m_marginRight = containerWidth - m_width - m_marginLeft;
+ else
+ m_marginLeft = containerWidth - m_width - m_marginRight;
+ }
+}
+
+int RenderBox::calcWidthUsing(WidthType widthType, int cw)
+{
+ int width = m_width;
+ Length w;
+ if (widthType == Width)
+ w = style()->width();
+ else if (widthType == MinWidth)
+ w = style()->minWidth();
+ else
+ w = style()->maxWidth();
+
+ if (w.isIntrinsicOrAuto()) {
+ int marginLeft = style()->marginLeft().calcMinValue(cw);
+ int marginRight = style()->marginRight().calcMinValue(cw);
+ if (cw)
+ width = cw - marginLeft - marginRight;
+
+ if (sizesToIntrinsicWidth(widthType)) {
+ width = max(width, minPrefWidth());
+ width = min(width, maxPrefWidth());
+ }
+ } else
+ width = calcBorderBoxWidth(w.calcValue(cw));
+
+ return width;
+}
+
+bool RenderBox::sizesToIntrinsicWidth(WidthType widthType) const
+{
+ // Marquees in WinIE are like a mixture of blocks and inline-blocks. They size as though they're blocks,
+ // but they allow text to sit on the same line as the marquee.
+ if (isFloating() || (isCompact() && isInline())
+ || (isInlineBlockOrInlineTable() && !isHTMLMarquee()))
+ return true;
+
+ // This code may look a bit strange. Basically width:intrinsic should clamp the size when testing both
+ // min-width and width. max-width is only clamped if it is also intrinsic.
+ Length width = (widthType == MaxWidth) ? style()->maxWidth() : style()->width();
+ if (width.type() == Intrinsic)
+ return true;
+
+ // Children of a horizontal marquee do not fill the container by default.
+ // FIXME: Need to deal with MAUTO value properly. It could be vertical.
+ if (parent()->style()->overflowX() == OMARQUEE) {
+ EMarqueeDirection dir = parent()->style()->marqueeDirection();
+ if (dir == MAUTO || dir == MFORWARD || dir == MBACKWARD || dir == MLEFT || dir == MRIGHT)
+ return true;
+ }
+
+ // Flexible horizontal boxes lay out children at their intrinsic widths. Also vertical boxes
+ // that don't stretch their kids lay out their children at their intrinsic widths.
+ if (parent()->isFlexibleBox()
+ && (parent()->style()->boxOrient() == HORIZONTAL || parent()->style()->boxAlign() != BSTRETCH))
+ return true;
+
+ return false;
+}
+
+void RenderBox::calcHorizontalMargins(const Length& marginLeft, const Length& marginRight, int containerWidth)
+{
+ if (isFloating() || isInline()) {
+ // Inline blocks/tables and floats don't have their margins increased.
+ m_marginLeft = marginLeft.calcMinValue(containerWidth);
+ m_marginRight = marginRight.calcMinValue(containerWidth);
+ return;
+ }
+
+ if ((marginLeft.isAuto() && marginRight.isAuto() && m_width < containerWidth)
+ || (!marginLeft.isAuto() && !marginRight.isAuto() && containingBlock()->style()->textAlign() == WEBKIT_CENTER)) {
+ m_marginLeft = max(0, (containerWidth - m_width) / 2);
+ m_marginRight = containerWidth - m_width - m_marginLeft;
+ } else if ((marginRight.isAuto() && m_width < containerWidth)
+ || (!marginLeft.isAuto() && containingBlock()->style()->direction() == RTL && containingBlock()->style()->textAlign() == WEBKIT_LEFT)) {
+ m_marginLeft = marginLeft.calcValue(containerWidth);
+ m_marginRight = containerWidth - m_width - m_marginLeft;
+ } else if ((marginLeft.isAuto() && m_width < containerWidth)
+ || (!marginRight.isAuto() && containingBlock()->style()->direction() == LTR && containingBlock()->style()->textAlign() == WEBKIT_RIGHT)) {
+ m_marginRight = marginRight.calcValue(containerWidth);
+ m_marginLeft = containerWidth - m_width - m_marginRight;
+ } else {
+ // This makes auto margins 0 if we failed a m_width < containerWidth test above (css2.1, 10.3.3).
+ m_marginLeft = marginLeft.calcMinValue(containerWidth);
+ m_marginRight = marginRight.calcMinValue(containerWidth);
+ }
+}
+
+void RenderBox::calcHeight()
+{
+ // Cell height is managed by the table and inline non-replaced elements do not support a height property.
+ if (isTableCell() || (isInline() && !isReplaced()))
+ return;
+
+ if (isPositioned())
+ calcAbsoluteVertical();
+ else {
+ calcVerticalMargins();
+
+ // For tables, calculate margins only.
+ if (isTable())
+ return;
+
+ Length h;
+ bool inHorizontalBox = parent()->isFlexibleBox() && parent()->style()->boxOrient() == HORIZONTAL;
+ bool stretching = parent()->style()->boxAlign() == BSTRETCH;
+ bool treatAsReplaced = isReplaced() && !isInlineBlockOrInlineTable() && (!inHorizontalBox || !stretching);
+ bool checkMinMaxHeight = false;
+
+ // The parent box is flexing us, so it has increased or decreased our height. We have to
+ // grab our cached flexible height.
+ if (hasOverrideSize() && parent()->isFlexibleBox() && parent()->style()->boxOrient() == VERTICAL
+ && parent()->isFlexingChildren())
+ h = Length(overrideSize() - borderTop() - borderBottom() - paddingTop() - paddingBottom(), Fixed);
+ else if (treatAsReplaced)
+ h = Length(calcReplacedHeight(), Fixed);
+ else {
+ h = style()->height();
+ checkMinMaxHeight = true;
+ }
+
+ // Block children of horizontal flexible boxes fill the height of the box.
+ if (h.isAuto() && parent()->isFlexibleBox() && parent()->style()->boxOrient() == HORIZONTAL
+ && parent()->isStretchingChildren()) {
+ h = Length(parent()->contentHeight() - marginTop() - marginBottom() -
+ borderTop() - paddingTop() - borderBottom() - paddingBottom(), Fixed);
+ checkMinMaxHeight = false;
+ }
+
+ int height;
+ if (checkMinMaxHeight) {
+ height = calcHeightUsing(style()->height());
+ if (height == -1)
+ height = m_height;
+ int minH = calcHeightUsing(style()->minHeight()); // Leave as -1 if unset.
+ int maxH = style()->maxHeight().isUndefined() ? height : calcHeightUsing(style()->maxHeight());
+ if (maxH == -1)
+ maxH = height;
+ height = min(maxH, height);
+ height = max(minH, height);
+ } else
+ // The only times we don't check min/max height are when a fixed length has
+ // been given as an override. Just use that. The value has already been adjusted
+ // for box-sizing.
+ height = h.value() + borderTop() + borderBottom() + paddingTop() + paddingBottom();
+
+ m_height = height;
+ }
+
+ // WinIE quirk: The <html> block always fills the entire canvas in quirks mode. The <body> always fills the
+ // <html> block in quirks mode. Only apply this quirk if the block is normal flow and no height
+ // is specified.
+ if (stretchesToViewHeight()) {
+ int margins = collapsedMarginTop() + collapsedMarginBottom();
+ int visHeight = view()->frameView()->visibleHeight();
+ if (isRoot())
+ m_height = max(m_height, visHeight - margins);
+ else {
+ int marginsBordersPadding = margins + parent()->marginTop() + parent()->marginBottom()
+ + parent()->borderTop() + parent()->borderBottom()
+ + parent()->paddingTop() + parent()->paddingBottom();
+ m_height = max(m_height, visHeight - marginsBordersPadding);
+ }
+ }
+}
+
+int RenderBox::calcHeightUsing(const Length& h)
+{
+ int height = -1;
+ if (!h.isAuto()) {
+ if (h.isFixed())
+ height = h.value();
+ else if (h.isPercent())
+ height = calcPercentageHeight(h);
+ if (height != -1) {
+ height = calcBorderBoxHeight(height);
+ return height;
+ }
+ }
+ return height;
+}
+
+int RenderBox::calcPercentageHeight(const Length& height)
+{
+ int result = -1;
+ bool includeBorderPadding = isTable();
+ RenderBlock* cb = containingBlock();
+ if (style()->htmlHacks()) {
+ // In quirks mode, blocks with auto height are skipped, and we keep looking for an enclosing
+ // block that may have a specified height and then use it. In strict mode, this violates the
+ // specification, which states that percentage heights just revert to auto if the containing
+ // block has an auto height.
+ while (!cb->isRenderView() && !cb->isBody() && !cb->isTableCell() && !cb->isPositioned() && cb->style()->height().isAuto())
+ cb = cb->containingBlock();
+ }
+
+ // A positioned element that specified both top/bottom or that specifies height should be treated as though it has a height
+ // explicitly specified that can be used for any percentage computations.
+ bool isPositionedWithSpecifiedHeight = cb->isPositioned() && (!cb->style()->height().isAuto() || (!cb->style()->top().isAuto() && !cb->style()->bottom().isAuto()));
+
+ // Table cells violate what the CSS spec says to do with heights. Basically we
+ // don't care if the cell specified a height or not. We just always make ourselves
+ // be a percentage of the cell's current content height.
+ if (cb->isTableCell()) {
+ result = cb->overrideSize();
+ if (result == -1) {
+ // Normally we would let the cell size intrinsically, but scrolling overflow has to be
+ // treated differently, since WinIE lets scrolled overflow regions shrink as needed.
+ // While we can't get all cases right, we can at least detect when the cell has a specified
+ // height or when the table has a specified height. In these cases we want to initially have
+ // no size and allow the flexing of the table or the cell to its specified height to cause us
+ // to grow to fill the space. This could end up being wrong in some cases, but it is
+ // preferable to the alternative (sizing intrinsically and making the row end up too big).
+ RenderTableCell* cell = static_cast<RenderTableCell*>(cb);
+ if (scrollsOverflowY() && (!cell->style()->height().isAuto() || !cell->table()->style()->height().isAuto()))
+ return 0;
+ return -1;
+ }
+ includeBorderPadding = true;
+ }
+ // Otherwise we only use our percentage height if our containing block had a specified
+ // height.
+ else if (cb->style()->height().isFixed())
+ result = cb->calcContentBoxHeight(cb->style()->height().value());
+ else if (cb->style()->height().isPercent() && !isPositionedWithSpecifiedHeight) {
+ // We need to recur and compute the percentage height for our containing block.
+ result = cb->calcPercentageHeight(cb->style()->height());
+ if (result != -1)
+ result = cb->calcContentBoxHeight(result);
+ } else if (cb->isRenderView() || (cb->isBody() && style()->htmlHacks()) || isPositionedWithSpecifiedHeight) {
+ // Don't allow this to affect the block' m_height member variable, since this
+ // can get called while the block is still laying out its kids.
+ int oldHeight = cb->height();
+ cb->calcHeight();
+ result = cb->contentHeight();
+ cb->setHeight(oldHeight);
+ } else if (cb->isRoot() && isPositioned())
+ // Match the positioned objects behavior, which is that positioned objects will fill their viewport
+ // always. Note we could only hit this case by recurring into calcPercentageHeight on a positioned containing block.
+ result = cb->calcContentBoxHeight(cb->availableHeight());
+
+ if (result != -1) {
+ result = height.calcValue(result);
+ if (includeBorderPadding) {
+ // It is necessary to use the border-box to match WinIE's broken
+ // box model. This is essential for sizing inside
+ // table cells using percentage heights.
+ result -= (borderTop() + paddingTop() + borderBottom() + paddingBottom());
+ result = max(0, result);
+ }
+ }
+ return result;
+}
+
+int RenderBox::calcReplacedWidth() const
+{
+ int width = calcReplacedWidthUsing(style()->width());
+ int minW = calcReplacedWidthUsing(style()->minWidth());
+ int maxW = style()->maxWidth().isUndefined() ? width : calcReplacedWidthUsing(style()->maxWidth());
+
+ return max(minW, min(width, maxW));
+}
+
+int RenderBox::calcReplacedWidthUsing(Length width) const
+{
+ switch (width.type()) {
+ case Fixed:
+ return calcContentBoxWidth(width.value());
+ case Percent: {
+ const int cw = containingBlockWidth();
+ if (cw > 0)
+ return calcContentBoxWidth(width.calcMinValue(cw));
+ }
+ // fall through
+ default:
+ return intrinsicSize().width();
+ }
+ }
+
+int RenderBox::calcReplacedHeight() const
+{
+ int height = calcReplacedHeightUsing(style()->height());
+ int minH = calcReplacedHeightUsing(style()->minHeight());
+ int maxH = style()->maxHeight().isUndefined() ? height : calcReplacedHeightUsing(style()->maxHeight());
+
+ return max(minH, min(height, maxH));
+}
+
+int RenderBox::calcReplacedHeightUsing(Length height) const
+{
+ switch (height.type()) {
+ case Fixed:
+ return calcContentBoxHeight(height.value());
+ case Percent:
+ {
+ RenderObject* cb = isPositioned() ? container() : containingBlock();
+ if (cb->isPositioned() && cb->style()->height().isAuto() && !(cb->style()->top().isAuto() || cb->style()->bottom().isAuto())) {
+ ASSERT(cb->isRenderBlock());
+ RenderBlock* block = static_cast<RenderBlock*>(cb);
+ int oldHeight = block->height();
+ block->calcHeight();
+ int newHeight = block->calcContentBoxHeight(block->contentHeight());
+ block->setHeight(oldHeight);
+ return calcContentBoxHeight(height.calcValue(newHeight));
+ }
+
+ int availableHeight = isPositioned() ? containingBlockHeightForPositioned(cb) : cb->availableHeight();
+
+ // It is necessary to use the border-box to match WinIE's broken
+ // box model. This is essential for sizing inside
+ // table cells using percentage heights.
+ if (cb->isTableCell() && (cb->style()->height().isAuto() || cb->style()->height().isPercent()))
+ return height.calcValue(availableHeight - (borderTop() + borderBottom()
+ + paddingTop() + paddingBottom()));
+
+ return calcContentBoxHeight(height.calcValue(availableHeight));
+ }
+ default:
+ return intrinsicSize().height();
+ }
+}
+
+int RenderBox::availableHeight() const
+{
+ return availableHeightUsing(style()->height());
+}
+
+int RenderBox::availableHeightUsing(const Length& h) const
+{
+ if (h.isFixed())
+ return calcContentBoxHeight(h.value());
+
+ if (isRenderView())
+ return static_cast<const RenderView*>(this)->frameView()->visibleHeight();
+
+ // We need to stop here, since we don't want to increase the height of the table
+ // artificially. We're going to rely on this cell getting expanded to some new
+ // height, and then when we lay out again we'll use the calculation below.
+ if (isTableCell() && (h.isAuto() || h.isPercent()))
+ return overrideSize() - (borderLeft() + borderRight() + paddingLeft() + paddingRight());
+
+ if (h.isPercent())
+ return calcContentBoxHeight(h.calcValue(containingBlock()->availableHeight()));
+
+ return containingBlock()->availableHeight();
+}
+
+void RenderBox::calcVerticalMargins()
+{
+ if (isTableCell()) {
+ m_marginTop = 0;
+ m_marginBottom = 0;
+ return;
+ }
+
+ // margins are calculated with respect to the _width_ of
+ // the containing block (8.3)
+ int cw = containingBlock()->contentWidth();
+
+ m_marginTop = style()->marginTop().calcMinValue(cw);
+ m_marginBottom = style()->marginBottom().calcMinValue(cw);
+}
+
+int RenderBox::staticX() const
+{
+ return m_layer ? m_layer->staticX() : 0;
+}
+
+int RenderBox::staticY() const
+{
+ return m_layer ? m_layer->staticY() : 0;
+}
+
+void RenderBox::setStaticX(int staticX)
+{
+ ASSERT(isPositioned() || isRelPositioned());
+ m_layer->setStaticX(staticX);
+}
+
+void RenderBox::setStaticY(int staticY)
+{
+ ASSERT(isPositioned() || isRelPositioned());
+
+ if (staticY == m_layer->staticY())
+ return;
+
+ m_layer->setStaticY(staticY);
+ setChildNeedsLayout(true, false);
+}
+
+int RenderBox::containingBlockWidthForPositioned(const RenderObject* containingBlock) const
+{
+ if (containingBlock->isInlineFlow()) {
+ ASSERT(containingBlock->isRelPositioned());
+
+ const RenderFlow* flow = static_cast<const RenderFlow*>(containingBlock);
+ InlineFlowBox* first = flow->firstLineBox();
+ InlineFlowBox* last = flow->lastLineBox();
+
+ // If the containing block is empty, return a width of 0.
+ if (!first || !last)
+ return 0;
+
+ int fromLeft;
+ int fromRight;
+ if (containingBlock->style()->direction() == LTR) {
+ fromLeft = first->xPos() + first->borderLeft();
+ fromRight = last->xPos() + last->width() - last->borderRight();
+ } else {
+ fromRight = first->xPos() + first->width() - first->borderRight();
+ fromLeft = last->xPos() + last->borderLeft();
+ }
+
+ return max(0, (fromRight - fromLeft));
+ }
+
+ return containingBlock->width() - containingBlock->borderLeft() - containingBlock->borderRight();
+}
+
+int RenderBox::containingBlockHeightForPositioned(const RenderObject* containingBlock) const
+{
+ return containingBlock->height() - containingBlock->borderTop() - containingBlock->borderBottom();
+}
+
+void RenderBox::calcAbsoluteHorizontal()
+{
+ if (isReplaced()) {
+ calcAbsoluteHorizontalReplaced();
+ return;
+ }
+
+ // QUESTIONS
+ // FIXME 1: Which RenderObject's 'direction' property should used: the
+ // containing block (cb) as the spec seems to imply, the parent (parent()) as
+ // was previously done in calculating the static distances, or ourself, which
+ // was also previously done for deciding what to override when you had
+ // over-constrained margins? Also note that the container block is used
+ // in similar situations in other parts of the RenderBox class (see calcWidth()
+ // and calcHorizontalMargins()). For now we are using the parent for quirks
+ // mode and the containing block for strict mode.
+
+ // FIXME 2: Should we still deal with these the cases of 'left' or 'right' having
+ // the type 'static' in determining whether to calculate the static distance?
+ // NOTE: 'static' is not a legal value for 'left' or 'right' as of CSS 2.1.
+
+ // FIXME 3: Can perhaps optimize out cases when max-width/min-width are greater
+ // than or less than the computed m_width. Be careful of box-sizing and
+ // percentage issues.
+
+ // The following is based off of the W3C Working Draft from April 11, 2006 of
+ // CSS 2.1: Section 10.3.7 "Absolutely positioned, non-replaced elements"
+ // <http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width>
+ // (block-style-comments in this function and in calcAbsoluteHorizontalValues()
+ // correspond to text from the spec)
+
+
+ // We don't use containingBlock(), since we may be positioned by an enclosing
+ // relative positioned inline.
+ const RenderObject* containerBlock = container();
+
+ const int containerWidth = containingBlockWidthForPositioned(containerBlock);
+
+ // To match WinIE, in quirks mode use the parent's 'direction' property
+ // instead of the the container block's.
+ TextDirection containerDirection = (style()->htmlHacks()) ? parent()->style()->direction() : containerBlock->style()->direction();
+
+ const int bordersPlusPadding = borderLeft() + borderRight() + paddingLeft() + paddingRight();
+ const Length marginLeft = style()->marginLeft();
+ const Length marginRight = style()->marginRight();
+ Length left = style()->left();
+ Length right = style()->right();
+
+ /*---------------------------------------------------------------------------*\
+ * For the purposes of this section and the next, the term "static position"
+ * (of an element) refers, roughly, to the position an element would have had
+ * in the normal flow. More precisely:
+ *
+ * * The static position for 'left' is the distance from the left edge of the
+ * containing block to the left margin edge of a hypothetical box that would
+ * have been the first box of the element if its 'position' property had
+ * been 'static' and 'float' had been 'none'. The value is negative if the
+ * hypothetical box is to the left of the containing block.
+ * * The static position for 'right' is the distance from the right edge of the
+ * containing block to the right margin edge of the same hypothetical box as
+ * above. The value is positive if the hypothetical box is to the left of the
+ * containing block's edge.
+ *
+ * But rather than actually calculating the dimensions of that hypothetical box,
+ * user agents are free to make a guess at its probable position.
+ *
+ * For the purposes of calculating the static position, the containing block of
+ * fixed positioned elements is the initial containing block instead of the
+ * viewport, and all scrollable boxes should be assumed to be scrolled to their
+ * origin.
+ \*---------------------------------------------------------------------------*/
+
+ // see FIXME 2
+ // Calculate the static distance if needed.
+ if (left.isAuto() && right.isAuto()) {
+ if (containerDirection == LTR) {
+ // 'staticX' should already have been set through layout of the parent.
+ int staticPosition = staticX() - containerBlock->borderLeft();
+ for (RenderObject* po = parent(); po && po != containerBlock; po = po->parent())
+ staticPosition += po->xPos();
+ left.setValue(Fixed, staticPosition);
+ } else {
+ RenderObject* po = parent();
+ // 'staticX' should already have been set through layout of the parent.
+ int staticPosition = staticX() + containerWidth + containerBlock->borderRight() - po->width();
+ for (; po && po != containerBlock; po = po->parent())
+ staticPosition -= po->xPos();
+ right.setValue(Fixed, staticPosition);
+ }
+ }
+
+ // Calculate constraint equation values for 'width' case.
+ calcAbsoluteHorizontalValues(style()->width(), containerBlock, containerDirection,
+ containerWidth, bordersPlusPadding,
+ left, right, marginLeft, marginRight,
+ m_width, m_marginLeft, m_marginRight, m_x);
+
+ // Calculate constraint equation values for 'max-width' case.
+ if (!style()->maxWidth().isUndefined()) {
+ int maxWidth;
+ int maxMarginLeft;
+ int maxMarginRight;
+ int maxXPos;
+
+ calcAbsoluteHorizontalValues(style()->maxWidth(), containerBlock, containerDirection,
+ containerWidth, bordersPlusPadding,
+ left, right, marginLeft, marginRight,
+ maxWidth, maxMarginLeft, maxMarginRight, maxXPos);
+
+ if (m_width > maxWidth) {
+ m_width = maxWidth;
+ m_marginLeft = maxMarginLeft;
+ m_marginRight = maxMarginRight;
+ m_x = maxXPos;
+ }
+ }
+
+ // Calculate constraint equation values for 'min-width' case.
+ if (!style()->minWidth().isZero()) {
+ int minWidth;
+ int minMarginLeft;
+ int minMarginRight;
+ int minXPos;
+
+ calcAbsoluteHorizontalValues(style()->minWidth(), containerBlock, containerDirection,
+ containerWidth, bordersPlusPadding,
+ left, right, marginLeft, marginRight,
+ minWidth, minMarginLeft, minMarginRight, minXPos);
+
+ if (m_width < minWidth) {
+ m_width = minWidth;
+ m_marginLeft = minMarginLeft;
+ m_marginRight = minMarginRight;
+ m_x = minXPos;
+ }
+ }
+
+ if (stretchesToMinIntrinsicWidth() && m_width < minPrefWidth() - bordersPlusPadding)
+ calcAbsoluteHorizontalValues(Length(minPrefWidth() - bordersPlusPadding, Fixed), containerBlock, containerDirection,
+ containerWidth, bordersPlusPadding,
+ left, right, marginLeft, marginRight,
+ m_width, m_marginLeft, m_marginRight, m_x);
+
+ // Put m_width into correct form.
+ m_width += bordersPlusPadding;
+}
+
+void RenderBox::calcAbsoluteHorizontalValues(Length width, const RenderObject* containerBlock, TextDirection containerDirection,
+ const int containerWidth, const int bordersPlusPadding,
+ const Length left, const Length right, const Length marginLeft, const Length marginRight,
+ int& widthValue, int& marginLeftValue, int& marginRightValue, int& xPos)
+{
+ // 'left' and 'right' cannot both be 'auto' because one would of been
+ // converted to the static postion already
+ ASSERT(!(left.isAuto() && right.isAuto()));
+
+ int leftValue = 0;
+
+ bool widthIsAuto = width.isIntrinsicOrAuto();
+ bool leftIsAuto = left.isAuto();
+ bool rightIsAuto = right.isAuto();
+
+ if (!leftIsAuto && !widthIsAuto && !rightIsAuto) {
+ /*-----------------------------------------------------------------------*\
+ * If none of the three is 'auto': If both 'margin-left' and 'margin-
+ * right' are 'auto', solve the equation under the extra constraint that
+ * the two margins get equal values, unless this would make them negative,
+ * in which case when direction of the containing block is 'ltr' ('rtl'),
+ * set 'margin-left' ('margin-right') to zero and solve for 'margin-right'
+ * ('margin-left'). If one of 'margin-left' or 'margin-right' is 'auto',
+ * solve the equation for that value. If the values are over-constrained,
+ * ignore the value for 'left' (in case the 'direction' property of the
+ * containing block is 'rtl') or 'right' (in case 'direction' is 'ltr')
+ * and solve for that value.
+ \*-----------------------------------------------------------------------*/
+ // NOTE: It is not necessary to solve for 'right' in the over constrained
+ // case because the value is not used for any further calculations.
+
+ leftValue = left.calcValue(containerWidth);
+ widthValue = calcContentBoxWidth(width.calcValue(containerWidth));
+
+ const int availableSpace = containerWidth - (leftValue + widthValue + right.calcValue(containerWidth) + bordersPlusPadding);
+
+ // Margins are now the only unknown
+ if (marginLeft.isAuto() && marginRight.isAuto()) {
+ // Both margins auto, solve for equality
+ if (availableSpace >= 0) {
+ marginLeftValue = availableSpace / 2; // split the diference
+ marginRightValue = availableSpace - marginLeftValue; // account for odd valued differences
+ } else {
+ // see FIXME 1
+ if (containerDirection == LTR) {
+ marginLeftValue = 0;
+ marginRightValue = availableSpace; // will be negative
+ } else {
+ marginLeftValue = availableSpace; // will be negative
+ marginRightValue = 0;
+ }
+ }
+ } else if (marginLeft.isAuto()) {
+ // Solve for left margin
+ marginRightValue = marginRight.calcValue(containerWidth);
+ marginLeftValue = availableSpace - marginRightValue;
+ } else if (marginRight.isAuto()) {
+ // Solve for right margin
+ marginLeftValue = marginLeft.calcValue(containerWidth);
+ marginRightValue = availableSpace - marginLeftValue;
+ } else {
+ // Over-constrained, solve for left if direction is RTL
+ marginLeftValue = marginLeft.calcValue(containerWidth);
+ marginRightValue = marginRight.calcValue(containerWidth);
+
+ // see FIXME 1 -- used to be "this->style()->direction()"
+ if (containerDirection == RTL)
+ leftValue = (availableSpace + leftValue) - marginLeftValue - marginRightValue;
+ }
+ } else {
+ /*--------------------------------------------------------------------*\
+ * Otherwise, set 'auto' values for 'margin-left' and 'margin-right'
+ * to 0, and pick the one of the following six rules that applies.
+ *
+ * 1. 'left' and 'width' are 'auto' and 'right' is not 'auto', then the
+ * width is shrink-to-fit. Then solve for 'left'
+ *
+ * OMIT RULE 2 AS IT SHOULD NEVER BE HIT
+ * ------------------------------------------------------------------
+ * 2. 'left' and 'right' are 'auto' and 'width' is not 'auto', then if
+ * the 'direction' property of the containing block is 'ltr' set
+ * 'left' to the static position, otherwise set 'right' to the
+ * static position. Then solve for 'left' (if 'direction is 'rtl')
+ * or 'right' (if 'direction' is 'ltr').
+ * ------------------------------------------------------------------
+ *
+ * 3. 'width' and 'right' are 'auto' and 'left' is not 'auto', then the
+ * width is shrink-to-fit . Then solve for 'right'
+ * 4. 'left' is 'auto', 'width' and 'right' are not 'auto', then solve
+ * for 'left'
+ * 5. 'width' is 'auto', 'left' and 'right' are not 'auto', then solve
+ * for 'width'
+ * 6. 'right' is 'auto', 'left' and 'width' are not 'auto', then solve
+ * for 'right'
+ *
+ * Calculation of the shrink-to-fit width is similar to calculating the
+ * width of a table cell using the automatic table layout algorithm.
+ * Roughly: calculate the preferred width by formatting the content
+ * without breaking lines other than where explicit line breaks occur,
+ * and also calculate the preferred minimum width, e.g., by trying all
+ * possible line breaks. CSS 2.1 does not define the exact algorithm.
+ * Thirdly, calculate the available width: this is found by solving
+ * for 'width' after setting 'left' (in case 1) or 'right' (in case 3)
+ * to 0.
+ *
+ * Then the shrink-to-fit width is:
+ * min(max(preferred minimum width, available width), preferred width).
+ \*--------------------------------------------------------------------*/
+ // NOTE: For rules 3 and 6 it is not necessary to solve for 'right'
+ // because the value is not used for any further calculations.
+
+ // Calculate margins, 'auto' margins are ignored.
+ marginLeftValue = marginLeft.calcMinValue(containerWidth);
+ marginRightValue = marginRight.calcMinValue(containerWidth);
+
+ const int availableSpace = containerWidth - (marginLeftValue + marginRightValue + bordersPlusPadding);
+
+ // FIXME: Is there a faster way to find the correct case?
+ // Use rule/case that applies.
+ if (leftIsAuto && widthIsAuto && !rightIsAuto) {
+ // RULE 1: (use shrink-to-fit for width, and solve of left)
+ int rightValue = right.calcValue(containerWidth);
+
+ // FIXME: would it be better to have shrink-to-fit in one step?
+ int preferredWidth = maxPrefWidth() - bordersPlusPadding;
+ int preferredMinWidth = minPrefWidth() - bordersPlusPadding;
+ int availableWidth = availableSpace - rightValue;
+ widthValue = min(max(preferredMinWidth, availableWidth), preferredWidth);
+ leftValue = availableSpace - (widthValue + rightValue);
+ } else if (!leftIsAuto && widthIsAuto && rightIsAuto) {
+ // RULE 3: (use shrink-to-fit for width, and no need solve of right)
+ leftValue = left.calcValue(containerWidth);
+
+ // FIXME: would it be better to have shrink-to-fit in one step?
+ int preferredWidth = maxPrefWidth() - bordersPlusPadding;
+ int preferredMinWidth = minPrefWidth() - bordersPlusPadding;
+ int availableWidth = availableSpace - leftValue;
+ widthValue = min(max(preferredMinWidth, availableWidth), preferredWidth);
+ } else if (leftIsAuto && !width.isAuto() && !rightIsAuto) {
+ // RULE 4: (solve for left)
+ widthValue = calcContentBoxWidth(width.calcValue(containerWidth));
+ leftValue = availableSpace - (widthValue + right.calcValue(containerWidth));
+ } else if (!leftIsAuto && widthIsAuto && !rightIsAuto) {
+ // RULE 5: (solve for width)
+ leftValue = left.calcValue(containerWidth);
+ widthValue = availableSpace - (leftValue + right.calcValue(containerWidth));
+ } else if (!leftIsAuto&& !widthIsAuto && rightIsAuto) {
+ // RULE 6: (no need solve for right)
+ leftValue = left.calcValue(containerWidth);
+ widthValue = calcContentBoxWidth(width.calcValue(containerWidth));
+ }
+ }
+
+ // Use computed values to calculate the horizontal position.
+
+ // FIXME: This hack is needed to calculate the xPos for a 'rtl' relatively
+ // positioned, inline containing block because right now, it is using the xPos
+ // of the first line box when really it should use the last line box. When
+ // this is fixed elsewhere, this block should be removed.
+ if (containerBlock->isInline() && containerBlock->style()->direction() == RTL) {
+ const RenderFlow* flow = static_cast<const RenderFlow*>(containerBlock);
+ InlineFlowBox* firstLine = flow->firstLineBox();
+ InlineFlowBox* lastLine = flow->lastLineBox();
+ if (firstLine && lastLine && firstLine != lastLine) {
+ xPos = leftValue + marginLeftValue + lastLine->borderLeft() + (lastLine->xPos() - firstLine->xPos());
+ return;
+ }
+ }
+
+ xPos = leftValue + marginLeftValue + containerBlock->borderLeft();
+}
+
+void RenderBox::calcAbsoluteVertical()
+{
+ if (isReplaced()) {
+ calcAbsoluteVerticalReplaced();
+ return;
+ }
+
+ // The following is based off of the W3C Working Draft from April 11, 2006 of
+ // CSS 2.1: Section 10.6.4 "Absolutely positioned, non-replaced elements"
+ // <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-non-replaced-height>
+ // (block-style-comments in this function and in calcAbsoluteVerticalValues()
+ // correspond to text from the spec)
+
+
+ // We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
+ const RenderObject* containerBlock = container();
+
+ const int containerHeight = containingBlockHeightForPositioned(containerBlock);
+
+ const int bordersPlusPadding = borderTop() + borderBottom() + paddingTop() + paddingBottom();
+ const Length marginTop = style()->marginTop();
+ const Length marginBottom = style()->marginBottom();
+ Length top = style()->top();
+ Length bottom = style()->bottom();
+
+ /*---------------------------------------------------------------------------*\
+ * For the purposes of this section and the next, the term "static position"
+ * (of an element) refers, roughly, to the position an element would have had
+ * in the normal flow. More precisely, the static position for 'top' is the
+ * distance from the top edge of the containing block to the top margin edge
+ * of a hypothetical box that would have been the first box of the element if
+ * its 'position' property had been 'static' and 'float' had been 'none'. The
+ * value is negative if the hypothetical box is above the containing block.
+ *
+ * But rather than actually calculating the dimensions of that hypothetical
+ * box, user agents are free to make a guess at its probable position.
+ *
+ * For the purposes of calculating the static position, the containing block
+ * of fixed positioned elements is the initial containing block instead of
+ * the viewport.
+ \*---------------------------------------------------------------------------*/
+
+ // see FIXME 2
+ // Calculate the static distance if needed.
+ if (top.isAuto() && bottom.isAuto()) {
+ // staticY should already have been set through layout of the parent()
+ int staticTop = staticY() - containerBlock->borderTop();
+ for (RenderObject* po = parent(); po && po != containerBlock; po = po->parent()) {
+ if (!po->isTableRow())
+ staticTop += po->yPos();
+ }
+ top.setValue(Fixed, staticTop);
+ }
+
+
+ int height; // Needed to compute overflow.
+
+ // Calculate constraint equation values for 'height' case.
+ calcAbsoluteVerticalValues(style()->height(), containerBlock, containerHeight, bordersPlusPadding,
+ top, bottom, marginTop, marginBottom,
+ height, m_marginTop, m_marginBottom, m_y);
+
+ // Avoid doing any work in the common case (where the values of min-height and max-height are their defaults).
+ // see FIXME 3
+
+ // Calculate constraint equation values for 'max-height' case.
+ if (!style()->maxHeight().isUndefined()) {
+ int maxHeight;
+ int maxMarginTop;
+ int maxMarginBottom;
+ int maxYPos;
+
+ calcAbsoluteVerticalValues(style()->maxHeight(), containerBlock, containerHeight, bordersPlusPadding,
+ top, bottom, marginTop, marginBottom,
+ maxHeight, maxMarginTop, maxMarginBottom, maxYPos);
+
+ if (height > maxHeight) {
+ height = maxHeight;
+ m_marginTop = maxMarginTop;
+ m_marginBottom = maxMarginBottom;
+ m_y = maxYPos;
+ }
+ }
+
+ // Calculate constraint equation values for 'min-height' case.
+ if (!style()->minHeight().isZero()) {
+ int minHeight;
+ int minMarginTop;
+ int minMarginBottom;
+ int minYPos;
+
+ calcAbsoluteVerticalValues(style()->minHeight(), containerBlock, containerHeight, bordersPlusPadding,
+ top, bottom, marginTop, marginBottom,
+ minHeight, minMarginTop, minMarginBottom, minYPos);
+
+ if (height < minHeight) {
+ height = minHeight;
+ m_marginTop = minMarginTop;
+ m_marginBottom = minMarginBottom;
+ m_y = minYPos;
+ }
+ }
+
+ // Set final height value.
+ m_height = height + bordersPlusPadding;
+}
+
+void RenderBox::calcAbsoluteVerticalValues(Length height, const RenderObject* containerBlock,
+ const int containerHeight, const int bordersPlusPadding,
+ const Length top, const Length bottom, const Length marginTop, const Length marginBottom,
+ int& heightValue, int& marginTopValue, int& marginBottomValue, int& yPos)
+{
+ // 'top' and 'bottom' cannot both be 'auto' because 'top would of been
+ // converted to the static position in calcAbsoluteVertical()
+ ASSERT(!(top.isAuto() && bottom.isAuto()));
+
+ int contentHeight = m_height - bordersPlusPadding;
+
+ int topValue = 0;
+
+ bool heightIsAuto = height.isAuto();
+ bool topIsAuto = top.isAuto();
+ bool bottomIsAuto = bottom.isAuto();
+
+ // Height is never unsolved for tables.
+ if (isTable()) {
+ height.setValue(Fixed, contentHeight);
+ heightIsAuto = false;
+ }
+
+ if (!topIsAuto && !heightIsAuto && !bottomIsAuto) {
+ /*-----------------------------------------------------------------------*\
+ * If none of the three are 'auto': If both 'margin-top' and 'margin-
+ * bottom' are 'auto', solve the equation under the extra constraint that
+ * the two margins get equal values. If one of 'margin-top' or 'margin-
+ * bottom' is 'auto', solve the equation for that value. If the values
+ * are over-constrained, ignore the value for 'bottom' and solve for that
+ * value.
+ \*-----------------------------------------------------------------------*/
+ // NOTE: It is not necessary to solve for 'bottom' in the over constrained
+ // case because the value is not used for any further calculations.
+
+ heightValue = calcContentBoxHeight(height.calcValue(containerHeight));
+ topValue = top.calcValue(containerHeight);
+
+ const int availableSpace = containerHeight - (topValue + heightValue + bottom.calcValue(containerHeight) + bordersPlusPadding);
+
+ // Margins are now the only unknown
+ if (marginTop.isAuto() && marginBottom.isAuto()) {
+ // Both margins auto, solve for equality
+ // NOTE: This may result in negative values.
+ marginTopValue = availableSpace / 2; // split the diference
+ marginBottomValue = availableSpace - marginTopValue; // account for odd valued differences
+ } else if (marginTop.isAuto()) {
+ // Solve for top margin
+ marginBottomValue = marginBottom.calcValue(containerHeight);
+ marginTopValue = availableSpace - marginBottomValue;
+ } else if (marginBottom.isAuto()) {
+ // Solve for bottom margin
+ marginTopValue = marginTop.calcValue(containerHeight);
+ marginBottomValue = availableSpace - marginTopValue;
+ } else {
+ // Over-constrained, (no need solve for bottom)
+ marginTopValue = marginTop.calcValue(containerHeight);
+ marginBottomValue = marginBottom.calcValue(containerHeight);
+ }
+ } else {
+ /*--------------------------------------------------------------------*\
+ * Otherwise, set 'auto' values for 'margin-top' and 'margin-bottom'
+ * to 0, and pick the one of the following six rules that applies.
+ *
+ * 1. 'top' and 'height' are 'auto' and 'bottom' is not 'auto', then
+ * the height is based on the content, and solve for 'top'.
+ *
+ * OMIT RULE 2 AS IT SHOULD NEVER BE HIT
+ * ------------------------------------------------------------------
+ * 2. 'top' and 'bottom' are 'auto' and 'height' is not 'auto', then
+ * set 'top' to the static position, and solve for 'bottom'.
+ * ------------------------------------------------------------------
+ *
+ * 3. 'height' and 'bottom' are 'auto' and 'top' is not 'auto', then
+ * the height is based on the content, and solve for 'bottom'.
+ * 4. 'top' is 'auto', 'height' and 'bottom' are not 'auto', and
+ * solve for 'top'.
+ * 5. 'height' is 'auto', 'top' and 'bottom' are not 'auto', and
+ * solve for 'height'.
+ * 6. 'bottom' is 'auto', 'top' and 'height' are not 'auto', and
+ * solve for 'bottom'.
+ \*--------------------------------------------------------------------*/
+ // NOTE: For rules 3 and 6 it is not necessary to solve for 'bottom'
+ // because the value is not used for any further calculations.
+
+ // Calculate margins, 'auto' margins are ignored.
+ marginTopValue = marginTop.calcMinValue(containerHeight);
+ marginBottomValue = marginBottom.calcMinValue(containerHeight);
+
+ const int availableSpace = containerHeight - (marginTopValue + marginBottomValue + bordersPlusPadding);
+
+ // Use rule/case that applies.
+ if (topIsAuto && heightIsAuto && !bottomIsAuto) {
+ // RULE 1: (height is content based, solve of top)
+ heightValue = contentHeight;
+ topValue = availableSpace - (heightValue + bottom.calcValue(containerHeight));
+ } else if (!topIsAuto && heightIsAuto && bottomIsAuto) {
+ // RULE 3: (height is content based, no need solve of bottom)
+ topValue = top.calcValue(containerHeight);
+ heightValue = contentHeight;
+ } else if (topIsAuto && !heightIsAuto && !bottomIsAuto) {
+ // RULE 4: (solve of top)
+ heightValue = calcContentBoxHeight(height.calcValue(containerHeight));
+ topValue = availableSpace - (heightValue + bottom.calcValue(containerHeight));
+ } else if (!topIsAuto && heightIsAuto && !bottomIsAuto) {
+ // RULE 5: (solve of height)
+ topValue = top.calcValue(containerHeight);
+ heightValue = max(0, availableSpace - (topValue + bottom.calcValue(containerHeight)));
+ } else if (!topIsAuto && !heightIsAuto && bottomIsAuto) {
+ // RULE 6: (no need solve of bottom)
+ heightValue = calcContentBoxHeight(height.calcValue(containerHeight));
+ topValue = top.calcValue(containerHeight);
+ }
+ }
+
+ // Use computed values to calculate the vertical position.
+ yPos = topValue + marginTopValue + containerBlock->borderTop();
+}
+
+void RenderBox::calcAbsoluteHorizontalReplaced()
+{
+ // The following is based off of the W3C Working Draft from April 11, 2006 of
+ // CSS 2.1: Section 10.3.8 "Absolutly positioned, replaced elements"
+ // <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-width>
+ // (block-style-comments in this function correspond to text from the spec and
+ // the numbers correspond to numbers in spec)
+
+ // We don't use containingBlock(), since we may be positioned by an enclosing
+ // relative positioned inline.
+ const RenderObject* containerBlock = container();
+
+ const int containerWidth = containingBlockWidthForPositioned(containerBlock);
+
+ // To match WinIE, in quirks mode use the parent's 'direction' property
+ // instead of the the container block's.
+ TextDirection containerDirection = (style()->htmlHacks()) ? parent()->style()->direction() : containerBlock->style()->direction();
+
+ // Variables to solve.
+ Length left = style()->left();
+ Length right = style()->right();
+ Length marginLeft = style()->marginLeft();
+ Length marginRight = style()->marginRight();
+
+
+ /*-----------------------------------------------------------------------*\
+ * 1. The used value of 'width' is determined as for inline replaced
+ * elements.
+ \*-----------------------------------------------------------------------*/
+ // NOTE: This value of width is FINAL in that the min/max width calculations
+ // are dealt with in calcReplacedWidth(). This means that the steps to produce
+ // correct max/min in the non-replaced version, are not necessary.
+ m_width = calcReplacedWidth() + borderLeft() + borderRight() + paddingLeft() + paddingRight();
+ const int availableSpace = containerWidth - m_width;
+
+ /*-----------------------------------------------------------------------*\
+ * 2. If both 'left' and 'right' have the value 'auto', then if 'direction'
+ * of the containing block is 'ltr', set 'left' to the static position;
+ * else if 'direction' is 'rtl', set 'right' to the static position.
+ \*-----------------------------------------------------------------------*/
+ // see FIXME 2
+ if (left.isAuto() && right.isAuto()) {
+ // see FIXME 1
+ if (containerDirection == LTR) {
+ // 'staticX' should already have been set through layout of the parent.
+ int staticPosition = staticX() - containerBlock->borderLeft();
+ for (RenderObject* po = parent(); po && po != containerBlock; po = po->parent())
+ staticPosition += po->xPos();
+ left.setValue(Fixed, staticPosition);
+ } else {
+ RenderObject* po = parent();
+ // 'staticX' should already have been set through layout of the parent.
+ int staticPosition = staticX() + containerWidth + containerBlock->borderRight() - po->width();
+ for (; po && po != containerBlock; po = po->parent())
+ staticPosition -= po->xPos();
+ right.setValue(Fixed, staticPosition);
+ }
+ }
+
+ /*-----------------------------------------------------------------------*\
+ * 3. If 'left' or 'right' are 'auto', replace any 'auto' on 'margin-left'
+ * or 'margin-right' with '0'.
+ \*-----------------------------------------------------------------------*/
+ if (left.isAuto() || right.isAuto()) {
+ if (marginLeft.isAuto())
+ marginLeft.setValue(Fixed, 0);
+ if (marginRight.isAuto())
+ marginRight.setValue(Fixed, 0);
+ }
+
+ /*-----------------------------------------------------------------------*\
+ * 4. If at this point both 'margin-left' and 'margin-right' are still
+ * 'auto', solve the equation under the extra constraint that the two
+ * margins must get equal values, unless this would make them negative,
+ * in which case when the direction of the containing block is 'ltr'
+ * ('rtl'), set 'margin-left' ('margin-right') to zero and solve for
+ * 'margin-right' ('margin-left').
+ \*-----------------------------------------------------------------------*/
+ int leftValue = 0;
+ int rightValue = 0;
+
+ if (marginLeft.isAuto() && marginRight.isAuto()) {
+ // 'left' and 'right' cannot be 'auto' due to step 3
+ ASSERT(!(left.isAuto() && right.isAuto()));
+
+ leftValue = left.calcValue(containerWidth);
+ rightValue = right.calcValue(containerWidth);
+
+ int difference = availableSpace - (leftValue + rightValue);
+ if (difference > 0) {
+ m_marginLeft = difference / 2; // split the diference
+ m_marginRight = difference - m_marginLeft; // account for odd valued differences
+ } else {
+ // see FIXME 1
+ if (containerDirection == LTR) {
+ m_marginLeft = 0;
+ m_marginRight = difference; // will be negative
+ } else {
+ m_marginLeft = difference; // will be negative
+ m_marginRight = 0;
+ }
+ }
+
+ /*-----------------------------------------------------------------------*\
+ * 5. If at this point there is an 'auto' left, solve the equation for
+ * that value.
+ \*-----------------------------------------------------------------------*/
+ } else if (left.isAuto()) {
+ m_marginLeft = marginLeft.calcValue(containerWidth);
+ m_marginRight = marginRight.calcValue(containerWidth);
+ rightValue = right.calcValue(containerWidth);
+
+ // Solve for 'left'
+ leftValue = availableSpace - (rightValue + m_marginLeft + m_marginRight);
+ } else if (right.isAuto()) {
+ m_marginLeft = marginLeft.calcValue(containerWidth);
+ m_marginRight = marginRight.calcValue(containerWidth);
+ leftValue = left.calcValue(containerWidth);
+
+ // Solve for 'right'
+ rightValue = availableSpace - (leftValue + m_marginLeft + m_marginRight);
+ } else if (marginLeft.isAuto()) {
+ m_marginRight = marginRight.calcValue(containerWidth);
+ leftValue = left.calcValue(containerWidth);
+ rightValue = right.calcValue(containerWidth);
+
+ // Solve for 'margin-left'
+ m_marginLeft = availableSpace - (leftValue + rightValue + m_marginRight);
+ } else if (marginRight.isAuto()) {
+ m_marginLeft = marginLeft.calcValue(containerWidth);
+ leftValue = left.calcValue(containerWidth);
+ rightValue = right.calcValue(containerWidth);
+
+ // Solve for 'margin-right'
+ m_marginRight = availableSpace - (leftValue + rightValue + m_marginLeft);
+ } else {
+ // Nothing is 'auto', just calculate the values.
+ m_marginLeft = marginLeft.calcValue(containerWidth);
+ m_marginRight = marginRight.calcValue(containerWidth);
+ rightValue = right.calcValue(containerWidth);
+ leftValue = left.calcValue(containerWidth);
+ }
+
+ /*-----------------------------------------------------------------------*\
+ * 6. If at this point the values are over-constrained, ignore the value
+ * for either 'left' (in case the 'direction' property of the
+ * containing block is 'rtl') or 'right' (in case 'direction' is
+ * 'ltr') and solve for that value.
+ \*-----------------------------------------------------------------------*/
+ // NOTE: It is not necessary to solve for 'right' when the direction is
+ // LTR because the value is not used.
+ int totalWidth = m_width + leftValue + rightValue + m_marginLeft + m_marginRight;
+ if (totalWidth > containerWidth && (containerDirection == RTL))
+ leftValue = containerWidth - (totalWidth - leftValue);
+
+ // Use computed values to calculate the horizontal position.
+
+ // FIXME: This hack is needed to calculate the xPos for a 'rtl' relatively
+ // positioned, inline containing block because right now, it is using the xPos
+ // of the first line box when really it should use the last line box. When
+ // this is fixed elsewhere, this block should be removed.
+ if (containerBlock->isInline() && containerBlock->style()->direction() == RTL) {
+ const RenderFlow* flow = static_cast<const RenderFlow*>(containerBlock);
+ InlineFlowBox* firstLine = flow->firstLineBox();
+ InlineFlowBox* lastLine = flow->lastLineBox();
+ if (firstLine && lastLine && firstLine != lastLine) {
+ m_x = leftValue + m_marginLeft + lastLine->borderLeft() + (lastLine->xPos() - firstLine->xPos());
+ return;
+ }
+ }
+
+ m_x = leftValue + m_marginLeft + containerBlock->borderLeft();
+}
+
+void RenderBox::calcAbsoluteVerticalReplaced()
+{
+ // The following is based off of the W3C Working Draft from April 11, 2006 of
+ // CSS 2.1: Section 10.6.5 "Absolutly positioned, replaced elements"
+ // <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-height>
+ // (block-style-comments in this function correspond to text from the spec and
+ // the numbers correspond to numbers in spec)
+
+ // We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
+ const RenderObject* containerBlock = container();
+
+ const int containerHeight = containingBlockHeightForPositioned(containerBlock);
+
+ // Variables to solve.
+ Length top = style()->top();
+ Length bottom = style()->bottom();
+ Length marginTop = style()->marginTop();
+ Length marginBottom = style()->marginBottom();
+
+
+ /*-----------------------------------------------------------------------*\
+ * 1. The used value of 'height' is determined as for inline replaced
+ * elements.
+ \*-----------------------------------------------------------------------*/
+ // NOTE: This value of height is FINAL in that the min/max height calculations
+ // are dealt with in calcReplacedHeight(). This means that the steps to produce
+ // correct max/min in the non-replaced version, are not necessary.
+ m_height = calcReplacedHeight() + borderTop() + borderBottom() + paddingTop() + paddingBottom();
+ const int availableSpace = containerHeight - m_height;
+
+ /*-----------------------------------------------------------------------*\
+ * 2. If both 'top' and 'bottom' have the value 'auto', replace 'top'
+ * with the element's static position.
+ \*-----------------------------------------------------------------------*/
+ // see FIXME 2
+ if (top.isAuto() && bottom.isAuto()) {
+ // staticY should already have been set through layout of the parent().
+ int staticTop = staticY() - containerBlock->borderTop();
+ for (RenderObject* po = parent(); po && po != containerBlock; po = po->parent()) {
+ if (!po->isTableRow())
+ staticTop += po->yPos();
+ }
+ top.setValue(Fixed, staticTop);
+ }
+
+ /*-----------------------------------------------------------------------*\
+ * 3. If 'bottom' is 'auto', replace any 'auto' on 'margin-top' or
+ * 'margin-bottom' with '0'.
+ \*-----------------------------------------------------------------------*/
+ // FIXME: The spec. says that this step should only be taken when bottom is
+ // auto, but if only top is auto, this makes step 4 impossible.
+ if (top.isAuto() || bottom.isAuto()) {
+ if (marginTop.isAuto())
+ marginTop.setValue(Fixed, 0);
+ if (marginBottom.isAuto())
+ marginBottom.setValue(Fixed, 0);
+ }
+
+ /*-----------------------------------------------------------------------*\
+ * 4. If at this point both 'margin-top' and 'margin-bottom' are still
+ * 'auto', solve the equation under the extra constraint that the two
+ * margins must get equal values.
+ \*-----------------------------------------------------------------------*/
+ int topValue = 0;
+ int bottomValue = 0;
+
+ if (marginTop.isAuto() && marginBottom.isAuto()) {
+ // 'top' and 'bottom' cannot be 'auto' due to step 2 and 3 combinded.
+ ASSERT(!(top.isAuto() || bottom.isAuto()));
+
+ topValue = top.calcValue(containerHeight);
+ bottomValue = bottom.calcValue(containerHeight);
+
+ int difference = availableSpace - (topValue + bottomValue);
+ // NOTE: This may result in negative values.
+ m_marginTop = difference / 2; // split the difference
+ m_marginBottom = difference - m_marginTop; // account for odd valued differences
+
+ /*-----------------------------------------------------------------------*\
+ * 5. If at this point there is only one 'auto' left, solve the equation
+ * for that value.
+ \*-----------------------------------------------------------------------*/
+ } else if (top.isAuto()) {
+ m_marginTop = marginTop.calcValue(containerHeight);
+ m_marginBottom = marginBottom.calcValue(containerHeight);
+ bottomValue = bottom.calcValue(containerHeight);
+
+ // Solve for 'top'
+ topValue = availableSpace - (bottomValue + m_marginTop + m_marginBottom);
+ } else if (bottom.isAuto()) {
+ m_marginTop = marginTop.calcValue(containerHeight);
+ m_marginBottom = marginBottom.calcValue(containerHeight);
+ topValue = top.calcValue(containerHeight);
+
+ // Solve for 'bottom'
+ // NOTE: It is not necessary to solve for 'bottom' because we don't ever
+ // use the value.
+ } else if (marginTop.isAuto()) {
+ m_marginBottom = marginBottom.calcValue(containerHeight);
+ topValue = top.calcValue(containerHeight);
+ bottomValue = bottom.calcValue(containerHeight);
+
+ // Solve for 'margin-top'
+ m_marginTop = availableSpace - (topValue + bottomValue + m_marginBottom);
+ } else if (marginBottom.isAuto()) {
+ m_marginTop = marginTop.calcValue(containerHeight);
+ topValue = top.calcValue(containerHeight);
+ bottomValue = bottom.calcValue(containerHeight);
+
+ // Solve for 'margin-bottom'
+ m_marginBottom = availableSpace - (topValue + bottomValue + m_marginTop);
+ } else {
+ // Nothing is 'auto', just calculate the values.
+ m_marginTop = marginTop.calcValue(containerHeight);
+ m_marginBottom = marginBottom.calcValue(containerHeight);
+ topValue = top.calcValue(containerHeight);
+ // NOTE: It is not necessary to solve for 'bottom' because we don't ever
+ // use the value.
+ }
+
+ /*-----------------------------------------------------------------------*\
+ * 6. If at this point the values are over-constrained, ignore the value
+ * for 'bottom' and solve for that value.
+ \*-----------------------------------------------------------------------*/
+ // NOTE: It is not necessary to do this step because we don't end up using
+ // the value of 'bottom' regardless of whether the values are over-constrained
+ // or not.
+
+ // Use computed values to calculate the vertical position.
+ m_y = topValue + m_marginTop + containerBlock->borderTop();
+}
+
+IntRect RenderBox::caretRect(int offset, EAffinity affinity, int* extraWidthToEndOfLine)
+{
+ // VisiblePositions at offsets inside containers either a) refer to the positions before/after
+ // those containers (tables and select elements) or b) refer to the position inside an empty block.
+ // They never refer to children.
+ // FIXME: Paint the carets inside empty blocks differently than the carets before/after elements.
+
+ // FIXME: What about border and padding?
+ const int caretWidth = 1;
+ IntRect rect(xPos(), yPos(), caretWidth, m_height);
+ if (offset)
+ rect.move(IntSize(m_width - caretWidth, 0));
+ if (InlineBox* box = inlineBoxWrapper()) {
+ RootInlineBox* rootBox = box->root();
+ int top = rootBox->topOverflow();
+ rect.setY(top);
+ rect.setHeight(rootBox->bottomOverflow() - top);
+ }
+
+ // If height of box is smaller than font height, use the latter one,
+ // otherwise the caret might become invisible.
+ //
+ // Also, if the box is not a replaced element, always use the font height.
+ // This prevents the "big caret" bug described in:
+ // <rdar://problem/3777804> Deleting all content in a document can result in giant tall-as-window insertion point
+ //
+ // FIXME: ignoring :first-line, missing good reason to take care of
+ int fontHeight = style()->font().height();
+ if (fontHeight > rect.height() || !isReplaced() && !isTable())
+ rect.setHeight(fontHeight);
+
+ RenderObject* cb = containingBlock();
+ int cbx, cby;
+ if (!cb || !cb->absolutePosition(cbx, cby))
+ // No point returning a relative position.
+ return IntRect();
+
+ if (extraWidthToEndOfLine)
+ *extraWidthToEndOfLine = xPos() + m_width - rect.right();
+
+ rect.move(cbx, cby);
+ return rect;
+}
+
+int RenderBox::lowestPosition(bool includeOverflowInterior, bool includeSelf) const
+{
+ if (!includeSelf || !m_width)
+ return 0;
+ int bottom = m_height;
+ if (includeSelf && isRelPositioned())
+ bottom += relativePositionOffsetY();
+ return bottom;
+}
+
+int RenderBox::rightmostPosition(bool includeOverflowInterior, bool includeSelf) const
+{
+ if (!includeSelf || !m_height)
+ return 0;
+ int right = m_width;
+ if (includeSelf && isRelPositioned())
+ right += relativePositionOffsetX();
+ return right;
+}
+
+int RenderBox::leftmostPosition(bool includeOverflowInterior, bool includeSelf) const
+{
+ if (!includeSelf || !m_height)
+ return m_width;
+ int left = 0;
+ if (includeSelf && isRelPositioned())
+ left += relativePositionOffsetX();
+ return left;
+}
+
+} // namespace WebCore