--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/platform/Scrollbar.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,518 @@
+/*
+ * Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "Scrollbar.h"
+
+#include "AccessibilityScrollbar.h"
+#include "AXObjectCache.h"
+#include "EventHandler.h"
+#include "Frame.h"
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "PlatformMouseEvent.h"
+#include "ScrollbarClient.h"
+#include "ScrollbarTheme.h"
+
+#include <algorithm>
+
+using namespace std;
+
+#if PLATFORM(CHROMIUM) && OS(LINUX)
+// The position of the scrollbar thumb affects the appearance of the steppers, so
+// when the thumb moves, we have to invalidate them for painting.
+#define THUMB_POSITION_AFFECTS_BUTTONS
+#endif
+
+namespace WebCore {
+
+#if !PLATFORM(GTK) && !PLATFORM(EFL)
+PassRefPtr<Scrollbar> Scrollbar::createNativeScrollbar(ScrollbarClient* client, ScrollbarOrientation orientation, ScrollbarControlSize size)
+{
+ return adoptRef(new Scrollbar(client, orientation, size));
+}
+#endif
+
+int Scrollbar::maxOverlapBetweenPages()
+{
+ static int maxOverlapBetweenPages = ScrollbarTheme::nativeTheme()->maxOverlapBetweenPages();
+ return maxOverlapBetweenPages;
+}
+
+Scrollbar::Scrollbar(ScrollbarClient* client, ScrollbarOrientation orientation, ScrollbarControlSize controlSize,
+ ScrollbarTheme* theme)
+ : m_client(client)
+ , m_orientation(orientation)
+ , m_controlSize(controlSize)
+ , m_theme(theme)
+ , m_visibleSize(0)
+ , m_totalSize(0)
+ , m_currentPos(0)
+ , m_dragOrigin(0)
+ , m_lineStep(0)
+ , m_pageStep(0)
+ , m_pixelStep(1)
+ , m_hoveredPart(NoPart)
+ , m_pressedPart(NoPart)
+ , m_pressedPos(0)
+ , m_enabled(true)
+ , m_scrollTimer(this, &Scrollbar::autoscrollTimerFired)
+ , m_overlapsResizer(false)
+ , m_suppressInvalidation(false)
+{
+ if (!m_theme)
+ m_theme = ScrollbarTheme::nativeTheme();
+
+ m_theme->registerScrollbar(this);
+
+ // FIXME: This is ugly and would not be necessary if we fix cross-platform code to actually query for
+ // scrollbar thickness and use it when sizing scrollbars (rather than leaving one dimension of the scrollbar
+ // alone when sizing).
+ int thickness = m_theme->scrollbarThickness(controlSize);
+ Widget::setFrameRect(IntRect(0, 0, thickness, thickness));
+}
+
+Scrollbar::~Scrollbar()
+{
+ stopTimerIfNeeded();
+
+ m_theme->unregisterScrollbar(this);
+}
+
+bool Scrollbar::setValue(int v)
+{
+ v = max(min(v, m_totalSize - m_visibleSize), 0);
+ if (value() == v)
+ return false; // Our value stayed the same.
+ setCurrentPos(v);
+ return true;
+}
+
+void Scrollbar::setProportion(int visibleSize, int totalSize)
+{
+ if (visibleSize == m_visibleSize && totalSize == m_totalSize)
+ return;
+
+ m_visibleSize = visibleSize;
+ m_totalSize = totalSize;
+
+ updateThumbProportion();
+}
+
+void Scrollbar::setSteps(int lineStep, int pageStep, int pixelsPerStep)
+{
+ m_lineStep = lineStep;
+ m_pageStep = pageStep;
+ m_pixelStep = 1.0f / pixelsPerStep;
+}
+
+bool Scrollbar::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
+{
+#if HAVE(ACCESSIBILITY)
+ if (AXObjectCache::accessibilityEnabled()) {
+ if (parent() && parent()->isFrameView()) {
+ Document* document = static_cast<FrameView*>(parent())->frame()->document();
+ AXObjectCache* cache = document->axObjectCache();
+ AccessibilityScrollbar* axObject = static_cast<AccessibilityScrollbar*>(cache->getOrCreate(ScrollBarRole));
+ axObject->setScrollbar(this);
+ cache->postNotification(axObject, document, AXObjectCache::AXValueChanged, true);
+ }
+ }
+#endif
+
+ float step = 0;
+ if ((direction == ScrollUp && m_orientation == VerticalScrollbar) || (direction == ScrollLeft && m_orientation == HorizontalScrollbar))
+ step = -1;
+ else if ((direction == ScrollDown && m_orientation == VerticalScrollbar) || (direction == ScrollRight && m_orientation == HorizontalScrollbar))
+ step = 1;
+
+ if (granularity == ScrollByLine)
+ step *= m_lineStep;
+ else if (granularity == ScrollByPage)
+ step *= m_pageStep;
+ else if (granularity == ScrollByDocument)
+ step *= m_totalSize;
+ else if (granularity == ScrollByPixel)
+ step *= m_pixelStep;
+
+ float newPos = m_currentPos + step * multiplier;
+ float maxPos = m_totalSize - m_visibleSize;
+ return setCurrentPos(max(min(newPos, maxPos), 0.0f));
+}
+
+void Scrollbar::updateThumb()
+{
+#ifdef THUMB_POSITION_AFFECTS_BUTTONS
+ invalidate();
+#else
+ theme()->invalidateParts(this, ForwardTrackPart | BackTrackPart | ThumbPart);
+#endif
+}
+
+void Scrollbar::updateThumbPosition()
+{
+ updateThumb();
+}
+
+void Scrollbar::updateThumbProportion()
+{
+ updateThumb();
+}
+
+void Scrollbar::paint(GraphicsContext* context, const IntRect& damageRect)
+{
+ if (context->updatingControlTints() && theme()->supportsControlTints()) {
+ invalidate();
+ return;
+ }
+
+ if (context->paintingDisabled() || !frameRect().intersects(damageRect))
+ return;
+
+ if (!theme()->paint(this, context, damageRect))
+ Widget::paint(context, damageRect);
+}
+
+void Scrollbar::autoscrollTimerFired(Timer<Scrollbar>*)
+{
+ autoscrollPressedPart(theme()->autoscrollTimerDelay());
+}
+
+static bool thumbUnderMouse(Scrollbar* scrollbar)
+{
+ int thumbPos = scrollbar->theme()->trackPosition(scrollbar) + scrollbar->theme()->thumbPosition(scrollbar);
+ int thumbLength = scrollbar->theme()->thumbLength(scrollbar);
+ return scrollbar->pressedPos() >= thumbPos && scrollbar->pressedPos() < thumbPos + thumbLength;
+}
+
+void Scrollbar::autoscrollPressedPart(double delay)
+{
+ // Don't do anything for the thumb or if nothing was pressed.
+ if (m_pressedPart == ThumbPart || m_pressedPart == NoPart)
+ return;
+
+ // Handle the track.
+ if ((m_pressedPart == BackTrackPart || m_pressedPart == ForwardTrackPart) && thumbUnderMouse(this)) {
+ theme()->invalidatePart(this, m_pressedPart);
+ setHoveredPart(ThumbPart);
+ return;
+ }
+
+ // Handle the arrows and track.
+ if (scroll(pressedPartScrollDirection(), pressedPartScrollGranularity()))
+ startTimerIfNeeded(delay);
+}
+
+void Scrollbar::startTimerIfNeeded(double delay)
+{
+ // Don't do anything for the thumb.
+ if (m_pressedPart == ThumbPart)
+ return;
+
+ // Handle the track. We halt track scrolling once the thumb is level
+ // with us.
+ if ((m_pressedPart == BackTrackPart || m_pressedPart == ForwardTrackPart) && thumbUnderMouse(this)) {
+ theme()->invalidatePart(this, m_pressedPart);
+ setHoveredPart(ThumbPart);
+ return;
+ }
+
+ // We can't scroll if we've hit the beginning or end.
+ ScrollDirection dir = pressedPartScrollDirection();
+ if (dir == ScrollUp || dir == ScrollLeft) {
+ if (m_currentPos == 0)
+ return;
+ } else {
+ if (m_currentPos == maximum())
+ return;
+ }
+
+ m_scrollTimer.startOneShot(delay);
+}
+
+void Scrollbar::stopTimerIfNeeded()
+{
+ if (m_scrollTimer.isActive())
+ m_scrollTimer.stop();
+}
+
+ScrollDirection Scrollbar::pressedPartScrollDirection()
+{
+ if (m_orientation == HorizontalScrollbar) {
+ if (m_pressedPart == BackButtonStartPart || m_pressedPart == BackButtonEndPart || m_pressedPart == BackTrackPart)
+ return ScrollLeft;
+ return ScrollRight;
+ } else {
+ if (m_pressedPart == BackButtonStartPart || m_pressedPart == BackButtonEndPart || m_pressedPart == BackTrackPart)
+ return ScrollUp;
+ return ScrollDown;
+ }
+}
+
+ScrollGranularity Scrollbar::pressedPartScrollGranularity()
+{
+ if (m_pressedPart == BackButtonStartPart || m_pressedPart == BackButtonEndPart || m_pressedPart == ForwardButtonStartPart || m_pressedPart == ForwardButtonEndPart)
+ return ScrollByLine;
+ return ScrollByPage;
+}
+
+void Scrollbar::moveThumb(int pos)
+{
+ // Drag the thumb.
+ int thumbPos = theme()->thumbPosition(this);
+ int thumbLen = theme()->thumbLength(this);
+ int trackLen = theme()->trackLength(this);
+ int maxPos = trackLen - thumbLen;
+ int delta = pos - m_pressedPos;
+ if (delta > 0)
+ delta = min(maxPos - thumbPos, delta);
+ else if (delta < 0)
+ delta = max(-thumbPos, delta);
+ if (delta)
+ setCurrentPos(static_cast<float>(thumbPos + delta) * maximum() / (trackLen - thumbLen));
+}
+
+bool Scrollbar::setCurrentPos(float pos)
+{
+ if (pos == m_currentPos)
+ return false;
+
+ int oldValue = value();
+ int oldThumbPos = theme()->thumbPosition(this);
+ m_currentPos = pos;
+ updateThumbPosition();
+ if (m_pressedPart == ThumbPart)
+ setPressedPos(m_pressedPos + theme()->thumbPosition(this) - oldThumbPos);
+
+ if (value() != oldValue && client())
+ client()->valueChanged(this);
+ return true;
+}
+
+void Scrollbar::setHoveredPart(ScrollbarPart part)
+{
+ if (part == m_hoveredPart)
+ return;
+
+ if ((m_hoveredPart == NoPart || part == NoPart) && theme()->invalidateOnMouseEnterExit())
+ invalidate(); // Just invalidate the whole scrollbar, since the buttons at either end change anyway.
+ else if (m_pressedPart == NoPart) { // When there's a pressed part, we don't draw a hovered state, so there's no reason to invalidate.
+ theme()->invalidatePart(this, part);
+ theme()->invalidatePart(this, m_hoveredPart);
+ }
+ m_hoveredPart = part;
+}
+
+void Scrollbar::setPressedPart(ScrollbarPart part)
+{
+ if (m_pressedPart != NoPart)
+ theme()->invalidatePart(this, m_pressedPart);
+ m_pressedPart = part;
+ if (m_pressedPart != NoPart)
+ theme()->invalidatePart(this, m_pressedPart);
+ else if (m_hoveredPart != NoPart) // When we no longer have a pressed part, we can start drawing a hovered state on the hovered part.
+ theme()->invalidatePart(this, m_hoveredPart);
+}
+
+bool Scrollbar::mouseMoved(const PlatformMouseEvent& evt)
+{
+ if (m_pressedPart == ThumbPart) {
+ if (theme()->shouldSnapBackToDragOrigin(this, evt))
+ setCurrentPos(m_dragOrigin);
+ else {
+ moveThumb(m_orientation == HorizontalScrollbar ?
+ convertFromContainingWindow(evt.pos()).x() :
+ convertFromContainingWindow(evt.pos()).y());
+ }
+ return true;
+ }
+
+ if (m_pressedPart != NoPart)
+ m_pressedPos = (orientation() == HorizontalScrollbar ? convertFromContainingWindow(evt.pos()).x() : convertFromContainingWindow(evt.pos()).y());
+
+ ScrollbarPart part = theme()->hitTest(this, evt);
+ if (part != m_hoveredPart) {
+ if (m_pressedPart != NoPart) {
+ if (part == m_pressedPart) {
+ // The mouse is moving back over the pressed part. We
+ // need to start up the timer action again.
+ startTimerIfNeeded(theme()->autoscrollTimerDelay());
+ theme()->invalidatePart(this, m_pressedPart);
+ } else if (m_hoveredPart == m_pressedPart) {
+ // The mouse is leaving the pressed part. Kill our timer
+ // if needed.
+ stopTimerIfNeeded();
+ theme()->invalidatePart(this, m_pressedPart);
+ }
+ }
+
+ setHoveredPart(part);
+ }
+
+ return true;
+}
+
+bool Scrollbar::mouseExited()
+{
+ setHoveredPart(NoPart);
+ return true;
+}
+
+bool Scrollbar::mouseUp()
+{
+ setPressedPart(NoPart);
+ m_pressedPos = 0;
+ stopTimerIfNeeded();
+
+ if (parent() && parent()->isFrameView())
+ static_cast<FrameView*>(parent())->frame()->eventHandler()->setMousePressed(false);
+
+ return true;
+}
+
+bool Scrollbar::mouseDown(const PlatformMouseEvent& evt)
+{
+ // Early exit for right click
+ if (evt.button() == RightButton)
+ return true; // FIXME: Handled as context menu by Qt right now. Should just avoid even calling this method on a right click though.
+
+ setPressedPart(theme()->hitTest(this, evt));
+ int pressedPos = (orientation() == HorizontalScrollbar ? convertFromContainingWindow(evt.pos()).x() : convertFromContainingWindow(evt.pos()).y());
+
+ if ((m_pressedPart == BackTrackPart || m_pressedPart == ForwardTrackPart) && theme()->shouldCenterOnThumb(this, evt)) {
+ setHoveredPart(ThumbPart);
+ setPressedPart(ThumbPart);
+ m_dragOrigin = m_currentPos;
+ int thumbLen = theme()->thumbLength(this);
+ int desiredPos = pressedPos;
+ // Set the pressed position to the middle of the thumb so that when we do the move, the delta
+ // will be from the current pixel position of the thumb to the new desired position for the thumb.
+ m_pressedPos = theme()->trackPosition(this) + theme()->thumbPosition(this) + thumbLen / 2;
+ moveThumb(desiredPos);
+ return true;
+ } else if (m_pressedPart == ThumbPart)
+ m_dragOrigin = m_currentPos;
+
+ m_pressedPos = pressedPos;
+
+ autoscrollPressedPart(theme()->initialAutoscrollTimerDelay());
+ return true;
+}
+
+void Scrollbar::setFrameRect(const IntRect& rect)
+{
+ // Get our window resizer rect and see if we overlap. Adjust to avoid the overlap
+ // if necessary.
+ IntRect adjustedRect(rect);
+ bool overlapsResizer = false;
+ ScrollView* view = parent();
+ if (view && !rect.isEmpty() && !view->windowResizerRect().isEmpty()) {
+ IntRect resizerRect = view->convertFromContainingWindow(view->windowResizerRect());
+ if (rect.intersects(resizerRect)) {
+ if (orientation() == HorizontalScrollbar) {
+ int overlap = rect.right() - resizerRect.x();
+ if (overlap > 0 && resizerRect.right() >= rect.right()) {
+ adjustedRect.setWidth(rect.width() - overlap);
+ overlapsResizer = true;
+ }
+ } else {
+ int overlap = rect.bottom() - resizerRect.y();
+ if (overlap > 0 && resizerRect.bottom() >= rect.bottom()) {
+ adjustedRect.setHeight(rect.height() - overlap);
+ overlapsResizer = true;
+ }
+ }
+ }
+ }
+ if (overlapsResizer != m_overlapsResizer) {
+ m_overlapsResizer = overlapsResizer;
+ if (view)
+ view->adjustScrollbarsAvoidingResizerCount(m_overlapsResizer ? 1 : -1);
+ }
+
+ Widget::setFrameRect(adjustedRect);
+}
+
+void Scrollbar::setParent(ScrollView* parentView)
+{
+ if (!parentView && m_overlapsResizer && parent())
+ parent()->adjustScrollbarsAvoidingResizerCount(-1);
+ Widget::setParent(parentView);
+}
+
+void Scrollbar::setEnabled(bool e)
+{
+ if (m_enabled == e)
+ return;
+ m_enabled = e;
+ invalidate();
+}
+
+bool Scrollbar::isWindowActive() const
+{
+ return m_client && m_client->isActive();
+}
+
+void Scrollbar::invalidateRect(const IntRect& rect)
+{
+ if (suppressInvalidation())
+ return;
+ if (m_client)
+ m_client->invalidateScrollbarRect(this, rect);
+}
+
+IntRect Scrollbar::convertToContainingView(const IntRect& localRect) const
+{
+ if (m_client)
+ return m_client->convertFromScrollbarToContainingView(this, localRect);
+
+ return Widget::convertToContainingView(localRect);
+}
+
+IntRect Scrollbar::convertFromContainingView(const IntRect& parentRect) const
+{
+ if (m_client)
+ return m_client->convertFromContainingViewToScrollbar(this, parentRect);
+
+ return Widget::convertFromContainingView(parentRect);
+}
+
+IntPoint Scrollbar::convertToContainingView(const IntPoint& localPoint) const
+{
+ if (m_client)
+ return m_client->convertFromScrollbarToContainingView(this, localPoint);
+
+ return Widget::convertToContainingView(localPoint);
+}
+
+IntPoint Scrollbar::convertFromContainingView(const IntPoint& parentPoint) const
+{
+ if (m_client)
+ return m_client->convertFromContainingViewToScrollbar(this, parentPoint);
+
+ return Widget::convertFromContainingView(parentPoint);
+}
+
+}