/**

 * This file is part of the HTML widget for KDE.

 *

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 * Copyright (C) 2004, 2005, 2006 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 "RenderView.h"

#include "Document.h"

#include "Element.h"

#include "FrameView.h"

#include "Frame.h"

#include "GraphicsContext.h"

#include "RenderLayer.h"

using namespace std;

namespace WebCore {

RenderView::RenderView(Node* node, FrameView* view)

    : RenderBlock(node)

    , m_frameView(view)

    , m_selectionStart(0)

    , m_selectionEnd(0)

    , m_selectionStartPos(-1)

    , m_selectionEndPos(-1)

    , m_printImages(true)

    , m_maximalOutlineSize(0)

    , m_layoutState(0)

    , m_layoutStateDisableCount(0)

{

    // Clear our anonymous bit, set because RenderObject assumes

    // any renderer with document as the node is anonymous.

    setIsAnonymous(false);

    // init RenderObject attributes

    setInline(false);

    // try to contrain the width to the views width

    m_width = 0;

    m_height = 0;

    m_minPrefWidth = 0;

    m_maxPrefWidth = 0;

    setPrefWidthsDirty(true, false);

    setPositioned(true); // to 0,0 :)

    // Create a new root layer for our layer hierarchy.

    m_layer = new (node->document()->renderArena()) RenderLayer(this);

    setHasLayer(true);

}

RenderView::~RenderView()

{

}

void RenderView::calcHeight()

{

    if (!printing() && m_frameView)

        m_height = m_frameView->visibleHeight();

}

void RenderView::calcWidth()

{

    if (!printing() && m_frameView) {

#if PLATFORM(SYMBIAN) 

        calcPrefWidths();

        int minWidth = min(850, m_minPrefWidth);

        m_width = m_frameView->visibleWidth() > minWidth ? m_frameView->visibleWidth() : minWidth;       

#else

        m_width = m_frameView->visibleWidth();

#endif

    } 

    m_marginLeft = 0;

    m_marginRight = 0;

}

void RenderView::calcPrefWidths()

{

    ASSERT(prefWidthsDirty());

    RenderBlock::calcPrefWidths();

    m_maxPrefWidth = m_minPrefWidth;

}

void RenderView::layout()

{

    if (printing())

        m_minPrefWidth = m_maxPrefWidth = m_width;

    bool relayoutChildren = !printing() && (!m_frameView || m_width != m_frameView->visibleWidth() || m_height != m_frameView->visibleHeight());

    if (relayoutChildren)

        setChildNeedsLayout(true, false);

    ASSERT(!m_layoutState);

    LayoutState state;

    // FIXME: May be better to push a clip and avoid issuing offscreen repaints.

    state.m_clipped = false;

    m_layoutState = &state;

    if (needsLayout())

        RenderBlock::layout();

#if PLATFORM(SYMBIAN) 

    int minWidth = min(850, m_minPrefWidth);

    setOverflowWidth(m_frameView->visibleWidth() > minWidth ? m_frameView->visibleWidth() : minWidth);

#else

    // Ensure that docWidth() >= width() and docHeight() >= height().

    setOverflowWidth(m_width);

#endif

    setOverflowHeight(m_height);

    setOverflowWidth(docWidth());

    setOverflowHeight(docHeight());

    ASSERT(m_layoutStateDisableCount == 0);

    ASSERT(m_layoutState == &state);

    m_layoutState = 0;

    setNeedsLayout(false);

}

bool RenderView::absolutePosition(int& xPos, int& yPos, bool fixed) const

{

    if (fixed && m_frameView) {

        xPos = m_frameView->contentsX();

        yPos = m_frameView->contentsY();

    } else

        xPos = yPos = 0;

    return true;

}

void RenderView::paint(PaintInfo& paintInfo, int tx, int ty)

{

    // If we ever require layout but receive a paint anyway, something has gone horribly wrong.

    ASSERT(!needsLayout());

    // Cache the print rect because the dirty rect could get changed during painting.

    if (printing())

        setPrintRect(paintInfo.rect);

    else

        setPrintRect(IntRect());

    paintObject(paintInfo, tx, ty);

}

void RenderView::paintBoxDecorations(PaintInfo& paintInfo, int tx, int ty)

{

    // Check to see if we are enclosed by a transparent layer.  If so, we cannot blit

    // when scrolling, and we need to use slow repaints.

    Element* elt = document()->ownerElement();

    if (view() && elt && elt->renderer()) {

        RenderLayer* layer = elt->renderer()->enclosingLayer();

        if (layer->isTransparent() || layer->transparentAncestor())

            frameView()->setUseSlowRepaints();

    }

    if (elt || (firstChild() && firstChild()->style()->visibility() == VISIBLE) || !view())

        return;

    // This code typically only executes if the root element's visibility has been set to hidden.

    // Only fill with the base background color (typically white) if we're the root document, 

    // since iframes/frames with no background in the child document should show the parent's background.

    if (view()->isTransparent())

        frameView()->setUseSlowRepaints(); // The parent must show behind the child.

    else {

        Color baseColor = frameView()->baseBackgroundColor();

        if (baseColor.alpha() > 0) {

            paintInfo.context->save();

            paintInfo.context->setCompositeOperation(CompositeCopy);

            paintInfo.context->fillRect(paintInfo.rect, baseColor);

            paintInfo.context->restore();

        } else

            paintInfo.context->clearRect(paintInfo.rect);

    }

}

void RenderView::repaintViewRectangle(const IntRect& ur, bool immediate)

{

    if (printing() || ur.width() == 0 || ur.height() == 0)

        return;

    if (!m_frameView)

        return;

    // We always just invalidate the root view, since we could be an iframe that is clipped out

    // or even invisible.

    Element* elt = document()->ownerElement();

    if (!elt)

        m_frameView->repaintRectangle(ur, immediate);

    else if (RenderObject* obj = elt->renderer()) {

        IntRect vr = viewRect();

        IntRect r = intersection(ur, vr);

        // Subtract out the contentsX and contentsY offsets to get our coords within the viewing

        // rectangle.

        r.move(-vr.x(), -vr.y());

        // FIXME: Hardcoded offsets here are not good.

        r.move(obj->borderLeft() + obj->paddingLeft(),

               obj->borderTop() + obj->paddingTop());

        obj->repaintRectangle(r, immediate);

    }

}

void RenderView::computeAbsoluteRepaintRect(IntRect& rect, bool fixed)

{

    if (printing())

        return;

    if (fixed && m_frameView)

        rect.move(m_frameView->contentsX(), m_frameView->contentsY());

}

void RenderView::absoluteRects(Vector<IntRect>& rects, int tx, int ty, bool)

{

    rects.append(IntRect(tx, ty, m_layer->width(), m_layer->height()));

}

RenderObject* rendererAfterPosition(RenderObject* object, unsigned offset)

{

    if (!object)

        return 0;

    RenderObject* child = object->childAt(offset);

    return child ? child : object->nextInPreOrderAfterChildren();

}

IntRect RenderView::selectionRect(bool clipToVisibleContent) const

{

    document()->updateRendering();

    typedef HashMap<RenderObject*, SelectionInfo*> SelectionMap;

    SelectionMap selectedObjects;

    RenderObject* os = m_selectionStart;

    RenderObject* stop = rendererAfterPosition(m_selectionEnd, m_selectionEndPos);

    while (os && os != stop) {

        if ((os->canBeSelectionLeaf() || os == m_selectionStart || os == m_selectionEnd) && os->selectionState() != SelectionNone) {

            // Blocks are responsible for painting line gaps and margin gaps. They must be examined as well.

            selectedObjects.set(os, new SelectionInfo(os, clipToVisibleContent));

            RenderBlock* cb = os->containingBlock();

            while (cb && !cb->isRenderView()) {

                SelectionInfo* blockInfo = selectedObjects.get(cb);

                if (blockInfo)

                    break;

                selectedObjects.set(cb, new SelectionInfo(cb, clipToVisibleContent));

                cb = cb->containingBlock();

            }

        }

        os = os->nextInPreOrder();

    }

    // Now create a single bounding box rect that encloses the whole selection.

    IntRect selRect;

    SelectionMap::iterator end = selectedObjects.end();

    for (SelectionMap::iterator i = selectedObjects.begin(); i != end; ++i) {

        SelectionInfo* info = i->second;

        selRect.unite(info->rect());

        delete info;

    }

    return selRect;

}

void RenderView::setSelection(RenderObject* start, int startPos, RenderObject* end, int endPos)

{

    // Make sure both our start and end objects are defined.

    // Check www.msnbc.com and try clicking around to find the case where this happened.

    if ((start && !end) || (end && !start))

        return;

    // Just return if the selection hasn't changed.

    if (m_selectionStart == start && m_selectionStartPos == startPos &&

        m_selectionEnd == end && m_selectionEndPos == endPos)

        return;

    // Record the old selected objects.  These will be used later

    // when we compare against the new selected objects.

    int oldStartPos = m_selectionStartPos;

    int oldEndPos = m_selectionEndPos;

    // Objects each have a single selection rect to examine.

    typedef HashMap<RenderObject*, SelectionInfo*> SelectedObjectMap;

    SelectedObjectMap oldSelectedObjects;

    SelectedObjectMap newSelectedObjects;

    // Blocks contain selected objects and fill gaps between them, either on the left, right, or in between lines and blocks.

    // In order to get the repaint rect right, we have to examine left, middle, and right rects individually, since otherwise

    // the union of those rects might remain the same even when changes have occurred.

    typedef HashMap<RenderBlock*, BlockSelectionInfo*> SelectedBlockMap;

    SelectedBlockMap oldSelectedBlocks;

    SelectedBlockMap newSelectedBlocks;

    RenderObject* os = m_selectionStart;

    RenderObject* stop = rendererAfterPosition(m_selectionEnd, m_selectionEndPos);

    while (os && os != stop) {

        if ((os->canBeSelectionLeaf() || os == m_selectionStart || os == m_selectionEnd) && os->selectionState() != SelectionNone) {

            // Blocks are responsible for painting line gaps and margin gaps.  They must be examined as well.

            oldSelectedObjects.set(os, new SelectionInfo(os, false));

            RenderBlock* cb = os->containingBlock();

            while (cb && !cb->isRenderView()) {

                BlockSelectionInfo* blockInfo = oldSelectedBlocks.get(cb);

                if (blockInfo)

                    break;

                oldSelectedBlocks.set(cb, new BlockSelectionInfo(cb));

                cb = cb->containingBlock();

            }

        }

        os = os->nextInPreOrder();

    }

    // Now clear the selection.

    SelectedObjectMap::iterator oldObjectsEnd = oldSelectedObjects.end();

    for (SelectedObjectMap::iterator i = oldSelectedObjects.begin(); i != oldObjectsEnd; ++i)

        i->first->setSelectionState(SelectionNone);

    // set selection start and end

    m_selectionStart = start;

    m_selectionStartPos = startPos;

    m_selectionEnd = end;

    m_selectionEndPos = endPos;

    // Update the selection status of all objects between m_selectionStart and m_selectionEnd

    if (start && start == end)

        start->setSelectionState(SelectionBoth);

    else {

        if (start)

            start->setSelectionState(SelectionStart);

        if (end)

            end->setSelectionState(SelectionEnd);

    }

    RenderObject* o = start;

    stop = rendererAfterPosition(end, endPos);

    while (o && o != stop) {

        if (o != start && o != end && o->canBeSelectionLeaf())

            o->setSelectionState(SelectionInside);

        o = o->nextInPreOrder();

    }

    // Now that the selection state has been updated for the new objects, walk them again and

    // put them in the new objects list.

    o = start;

    while (o && o != stop) {

        if ((o->canBeSelectionLeaf() || o == start || o == end) && o->selectionState() != SelectionNone) {

            newSelectedObjects.set(o, new SelectionInfo(o, false));

            RenderBlock* cb = o->containingBlock();

            while (cb && !cb->isRenderView()) {

                BlockSelectionInfo* blockInfo = newSelectedBlocks.get(cb);

                if (blockInfo)

                    break;

                newSelectedBlocks.set(cb, new BlockSelectionInfo(cb));

                cb = cb->containingBlock();

            }

        }

        o = o->nextInPreOrder();

    }

    if (!m_frameView) {

        // We built the maps, but we aren't going to use them.

        // We need to delete the values, otherwise they'll all leak!

        deleteAllValues(oldSelectedObjects);

        deleteAllValues(newSelectedObjects);

        deleteAllValues(oldSelectedBlocks);

        deleteAllValues(newSelectedBlocks);

        return;

    }

    // Have any of the old selected objects changed compared to the new selection?

    for (SelectedObjectMap::iterator i = oldSelectedObjects.begin(); i != oldObjectsEnd; ++i) {

        RenderObject* obj = i->first;

        SelectionInfo* newInfo = newSelectedObjects.get(obj);

        SelectionInfo* oldInfo = i->second;

        if (!newInfo || oldInfo->rect() != newInfo->rect() || oldInfo->state() != newInfo->state() ||

            (m_selectionStart == obj && oldStartPos != m_selectionStartPos) ||

            (m_selectionEnd == obj && oldEndPos != m_selectionEndPos)) {

            m_frameView->updateContents(oldInfo->rect());

            if (newInfo) {

                m_frameView->updateContents(newInfo->rect());

                newSelectedObjects.remove(obj);

                delete newInfo;

            }

        }

        delete oldInfo;

    }

    // Any new objects that remain were not found in the old objects dict, and so they need to be updated.

    SelectedObjectMap::iterator newObjectsEnd = newSelectedObjects.end();

    for (SelectedObjectMap::iterator i = newSelectedObjects.begin(); i != newObjectsEnd; ++i) {

        SelectionInfo* newInfo = i->second;

        m_frameView->updateContents(newInfo->rect());

        delete newInfo;

    }

    // Have any of the old blocks changed?

    SelectedBlockMap::iterator oldBlocksEnd = oldSelectedBlocks.end();

    for (SelectedBlockMap::iterator i = oldSelectedBlocks.begin(); i != oldBlocksEnd; ++i) {

        RenderBlock* block = i->first;

        BlockSelectionInfo* newInfo = newSelectedBlocks.get(block);

        BlockSelectionInfo* oldInfo = i->second;

        if (!newInfo || oldInfo->rects() != newInfo->rects() || oldInfo->state() != newInfo->state()) {

            m_frameView->updateContents(oldInfo->rects());

            if (newInfo) {

                m_frameView->updateContents(newInfo->rects());

                newSelectedBlocks.remove(block);

                delete newInfo;

            }

        }

        delete oldInfo;

    }

    // Any new blocks that remain were not found in the old blocks dict, and so they need to be updated.

    SelectedBlockMap::iterator newBlocksEnd = newSelectedBlocks.end();

    for (SelectedBlockMap::iterator i = newSelectedBlocks.begin(); i != newBlocksEnd; ++i) {

        BlockSelectionInfo* newInfo = i->second;

        m_frameView->updateContents(newInfo->rects());

        delete newInfo;

    }

}

void RenderView::clearSelection()

{

    setSelection(0, -1, 0, -1);

}

void RenderView::selectionStartEnd(int& startPos, int& endPos) const

{

    startPos = m_selectionStartPos;

    endPos = m_selectionEndPos;

}

bool RenderView::printing() const

{

    return document()->printing();

}

void RenderView::updateWidgetPositions()

{

    RenderObjectSet::iterator end = m_widgets.end();

    for (RenderObjectSet::iterator it = m_widgets.begin(); it != end; ++it)

        (*it)->updateWidgetPosition();

}

void RenderView::addWidget(RenderObject* o)

{

    m_widgets.add(o);

}

void RenderView::removeWidget(RenderObject* o)

{

    m_widgets.remove(o);

}

IntRect RenderView::viewRect() const

{

    if (printing())

        return IntRect(0, 0, m_width, m_height);

    if (m_frameView)

        return enclosingIntRect(m_frameView->visibleContentRect());

    return IntRect();

}

int RenderView::docHeight() const

{

    int h;

    if (printing() || !m_frameView)

        h = m_height;

    else

        h = m_frameView->visibleHeight();

    int lowestPos = lowestPosition();

    if (lowestPos > h)

        h = lowestPos;

    // FIXME: This doesn't do any margin collapsing.

    // Instead of this dh computation we should keep the result

    // when we call RenderBlock::layout.

    int dh = 0;

    for (RenderObject* c = firstChild(); c; c = c->nextSibling())

        dh += c->height() + c->marginTop() + c->marginBottom();

    if (dh > h)

        h = dh;

    return h;

}

int RenderView::docWidth() const

{

    int w;

    if (printing() || !m_frameView)

        w = m_width;

    else

        w = m_frameView->visibleWidth();

    int rightmostPos = rightmostPosition();

    if (rightmostPos > w)

        w = rightmostPos;

    for (RenderObject *c = firstChild(); c; c = c->nextSibling()) {

        int dw = c->width() + c->marginLeft() + c->marginRight();

        if (dw > w)

            w = dw;

    }

    return w;

}