Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/ScrollableArea.cpp

-/*
- * Copyright (c) 2010, Google Inc. All rights reserved.
- * Copyright (C) 2008, 2011 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:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * 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.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "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 THE COPYRIGHT
- * OWNER 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 "core/platform/ScrollableArea.h"
-
-#include "core/platform/ScrollAnimator.h"
-#include "core/platform/ScrollbarTheme.h"
-#include "core/platform/graphics/GraphicsLayer.h"
-#include "platform/geometry/FloatPoint.h"
-#include "wtf/PassOwnPtr.h"
-
-#include "platform/TraceEvent.h"
-
-static const int kPixelsPerLineStep = 40;
-static const float kMinFractionToStepWhenPaging = 0.875f;
-
-namespace WebCore {
-
-struct SameSizeAsScrollableArea {
-    virtual ~SameSizeAsScrollableArea();
-    void* pointer;
-    unsigned bitfields : 16;
-    IntPoint origin;
-};
-
-COMPILE_ASSERT(sizeof(ScrollableArea) == sizeof(SameSizeAsScrollableArea), ScrollableArea_should_stay_small);
-
-int ScrollableArea::pixelsPerLineStep()
-{
-    return kPixelsPerLineStep;
-}
-
-float ScrollableArea::minFractionToStepWhenPaging()
-{
-    return kMinFractionToStepWhenPaging;
-}
-
-int ScrollableArea::maxOverlapBetweenPages()
-{
-    static int maxOverlapBetweenPages = ScrollbarTheme::theme()->maxOverlapBetweenPages();
-    return maxOverlapBetweenPages;
-}
-
-ScrollableArea::ScrollableArea()
-    : m_constrainsScrollingToContentEdge(true)
-    , m_inLiveResize(false)
-    , m_verticalScrollElasticity(ScrollElasticityNone)
-    , m_horizontalScrollElasticity(ScrollElasticityNone)
-    , m_scrollbarOverlayStyle(ScrollbarOverlayStyleDefault)
-    , m_scrollOriginChanged(false)
-{
-}
-
-ScrollableArea::~ScrollableArea()
-{
-}
-
-ScrollAnimator* ScrollableArea::scrollAnimator() const
-{
-    if (!m_scrollAnimator)
-        m_scrollAnimator = ScrollAnimator::create(const_cast<ScrollableArea*>(this));
-
-    return m_scrollAnimator.get();
-}
-
-void ScrollableArea::setScrollOrigin(const IntPoint& origin)
-{
-    if (m_scrollOrigin != origin) {
-        m_scrollOrigin = origin;
-        m_scrollOriginChanged = true;
-    }
-}
-
-bool ScrollableArea::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
-{
-    ScrollbarOrientation orientation;
-
-    if (direction == ScrollUp || direction == ScrollDown)
-        orientation = VerticalScrollbar;
-    else
-        orientation = HorizontalScrollbar;
-
-    if (!userInputScrollable(orientation))
-        return false;
-
-    float step = 0;
-    switch (granularity) {
-    case ScrollByLine:
-        step = lineStep(orientation);
-        break;
-    case ScrollByPage:
-        step = pageStep(orientation);
-        break;
-    case ScrollByDocument:
-        step = documentStep(orientation);
-        break;
-    case ScrollByPixel:
-    case ScrollByPrecisePixel:
-        step = pixelStep(orientation);
-        break;
-    }
-
-    if (direction == ScrollUp || direction == ScrollLeft)
-        multiplier = -multiplier;
-
-    return scrollAnimator()->scroll(orientation, granularity, step, multiplier);
-}
-
-void ScrollableArea::scrollToOffsetWithoutAnimation(const FloatPoint& offset)
-{
-    scrollAnimator()->scrollToOffsetWithoutAnimation(offset);
-}
-
-void ScrollableArea::scrollToOffsetWithoutAnimation(ScrollbarOrientation orientation, float offset)
-{
-    if (orientation == HorizontalScrollbar)
-        scrollToOffsetWithoutAnimation(FloatPoint(offset, scrollAnimator()->currentPosition().y()));
-    else
-        scrollToOffsetWithoutAnimation(FloatPoint(scrollAnimator()->currentPosition().x(), offset));
-}
-
-void ScrollableArea::notifyScrollPositionChanged(const IntPoint& position)
-{
-    scrollPositionChanged(position);
-    scrollAnimator()->setCurrentPosition(position);
-}
-
-void ScrollableArea::scrollPositionChanged(const IntPoint& position)
-{
-    TRACE_EVENT0("webkit", "ScrollableArea::scrollPositionChanged");
-
-    IntPoint oldPosition = scrollPosition();
-    // Tell the derived class to scroll its contents.
-    setScrollOffset(position);
-
-    Scrollbar* verticalScrollbar = this->verticalScrollbar();
-
-    // Tell the scrollbars to update their thumb postions.
-    if (Scrollbar* horizontalScrollbar = this->horizontalScrollbar()) {
-        horizontalScrollbar->offsetDidChange();
-        if (horizontalScrollbar->isOverlayScrollbar() && !hasLayerForHorizontalScrollbar()) {
-            if (!verticalScrollbar)
-                horizontalScrollbar->invalidate();
-            else {
-                // If there is both a horizontalScrollbar and a verticalScrollbar,
-                // then we must also invalidate the corner between them.
-                IntRect boundsAndCorner = horizontalScrollbar->boundsRect();
-                boundsAndCorner.setWidth(boundsAndCorner.width() + verticalScrollbar->width());
-                horizontalScrollbar->invalidateRect(boundsAndCorner);
-            }
-        }
-    }
-    if (verticalScrollbar) {
-        verticalScrollbar->offsetDidChange();
-        if (verticalScrollbar->isOverlayScrollbar() && !hasLayerForVerticalScrollbar())
-            verticalScrollbar->invalidate();
-    }
-
-    if (scrollPosition() != oldPosition)
-        scrollAnimator()->notifyContentAreaScrolled(scrollPosition() - oldPosition);
-}
-
-bool ScrollableArea::handleWheelEvent(const PlatformWheelEvent& wheelEvent)
-{
-    return scrollAnimator()->handleWheelEvent(wheelEvent);
-}
-
-// NOTE: Only called from Internals for testing.
-void ScrollableArea::setScrollOffsetFromInternals(const IntPoint& offset)
-{
-    setScrollOffsetFromAnimation(offset);
-}
-
-void ScrollableArea::setScrollOffsetFromAnimation(const IntPoint& offset)
-{
-    scrollPositionChanged(offset);
-}
-
-void ScrollableArea::willStartLiveResize()
-{
-    if (m_inLiveResize)
-        return;
-    m_inLiveResize = true;
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->willStartLiveResize();
-}
-
-void ScrollableArea::willEndLiveResize()
-{
-    if (!m_inLiveResize)
-        return;
-    m_inLiveResize = false;
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->willEndLiveResize();
-}
-
-void ScrollableArea::contentAreaWillPaint() const
-{
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->contentAreaWillPaint();
-}
-
-void ScrollableArea::mouseEnteredContentArea() const
-{
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->mouseEnteredContentArea();
-}
-
-void ScrollableArea::mouseExitedContentArea() const
-{
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->mouseEnteredContentArea();
-}
-
-void ScrollableArea::mouseMovedInContentArea() const
-{
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->mouseMovedInContentArea();
-}
-
-void ScrollableArea::mouseEnteredScrollbar(Scrollbar* scrollbar) const
-{
-    scrollAnimator()->mouseEnteredScrollbar(scrollbar);
-}
-
-void ScrollableArea::mouseExitedScrollbar(Scrollbar* scrollbar) const
-{
-    scrollAnimator()->mouseExitedScrollbar(scrollbar);
-}
-
-void ScrollableArea::contentAreaDidShow() const
-{
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->contentAreaDidShow();
-}
-
-void ScrollableArea::contentAreaDidHide() const
-{
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->contentAreaDidHide();
-}
-
-void ScrollableArea::finishCurrentScrollAnimations() const
-{
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->finishCurrentScrollAnimations();
-}
-
-void ScrollableArea::didAddScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
-{
-    if (orientation == VerticalScrollbar)
-        scrollAnimator()->didAddVerticalScrollbar(scrollbar);
-    else
-        scrollAnimator()->didAddHorizontalScrollbar(scrollbar);
-
-    // <rdar://problem/9797253> AppKit resets the scrollbar's style when you attach a scrollbar
-    setScrollbarOverlayStyle(scrollbarOverlayStyle());
-}
-
-void ScrollableArea::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
-{
-    if (orientation == VerticalScrollbar)
-        scrollAnimator()->willRemoveVerticalScrollbar(scrollbar);
-    else
-        scrollAnimator()->willRemoveHorizontalScrollbar(scrollbar);
-}
-
-void ScrollableArea::contentsResized()
-{
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->contentsResized();
-}
-
-bool ScrollableArea::hasOverlayScrollbars() const
-{
-    return (verticalScrollbar() && verticalScrollbar()->isOverlayScrollbar())
-        || (horizontalScrollbar() && horizontalScrollbar()->isOverlayScrollbar());
-}
-
-void ScrollableArea::setScrollbarOverlayStyle(ScrollbarOverlayStyle overlayStyle)
-{
-    m_scrollbarOverlayStyle = overlayStyle;
-
-    if (horizontalScrollbar()) {
-        ScrollbarTheme::theme()->updateScrollbarOverlayStyle(horizontalScrollbar());
-        horizontalScrollbar()->invalidate();
-    }
-
-    if (verticalScrollbar()) {
-        ScrollbarTheme::theme()->updateScrollbarOverlayStyle(verticalScrollbar());
-        verticalScrollbar()->invalidate();
-    }
-}
-
-void ScrollableArea::invalidateScrollbar(Scrollbar* scrollbar, const IntRect& rect)
-{
-    if (scrollbar == horizontalScrollbar()) {
-        if (GraphicsLayer* graphicsLayer = layerForHorizontalScrollbar()) {
-            graphicsLayer->setNeedsDisplay();
-            graphicsLayer->setContentsNeedsDisplay();
-            return;
-        }
-    } else if (scrollbar == verticalScrollbar()) {
-        if (GraphicsLayer* graphicsLayer = layerForVerticalScrollbar()) {
-            graphicsLayer->setNeedsDisplay();
-            graphicsLayer->setContentsNeedsDisplay();
-            return;
-        }
-    }
-    invalidateScrollbarRect(scrollbar, rect);
-}
-
-void ScrollableArea::invalidateScrollCorner(const IntRect& rect)
-{
-    if (GraphicsLayer* graphicsLayer = layerForScrollCorner()) {
-        graphicsLayer->setNeedsDisplay();
-        return;
-    }
-    invalidateScrollCornerRect(rect);
-}
-
-bool ScrollableArea::hasLayerForHorizontalScrollbar() const
-{
-    return layerForHorizontalScrollbar();
-}
-
-bool ScrollableArea::hasLayerForVerticalScrollbar() const
-{
-    return layerForVerticalScrollbar();
-}
-
-bool ScrollableArea::hasLayerForScrollCorner() const
-{
-    return layerForScrollCorner();
-}
-
-void ScrollableArea::serviceScrollAnimations()
-{
-    if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
-        scrollAnimator->serviceScrollAnimations();
-}
-
-IntRect ScrollableArea::visibleContentRect(IncludeScrollbarsInRect scrollbarInclusion) const
-{
-    int verticalScrollbarWidth = 0;
-    int horizontalScrollbarHeight = 0;
-
-    if (scrollbarInclusion == IncludeScrollbars) {
-        if (Scrollbar* verticalBar = verticalScrollbar())
-            verticalScrollbarWidth = !verticalBar->isOverlayScrollbar() ? verticalBar->width() : 0;
-        if (Scrollbar* horizontalBar = horizontalScrollbar())
-            horizontalScrollbarHeight = !horizontalBar->isOverlayScrollbar() ? horizontalBar->height() : 0;
-    }
-
-    return IntRect(scrollPosition().x(),
-                   scrollPosition().y(),
-                   std::max(0, visibleWidth() + verticalScrollbarWidth),
-                   std::max(0, visibleHeight() + horizontalScrollbarHeight));
-}
-
-IntPoint ScrollableArea::clampScrollPosition(const IntPoint& scrollPosition) const
-{
-    return scrollPosition.shrunkTo(maximumScrollPosition()).expandedTo(minimumScrollPosition());
-}
-
-int ScrollableArea::lineStep(ScrollbarOrientation) const
-{
-    return pixelsPerLineStep();
-}
-
-int ScrollableArea::documentStep(ScrollbarOrientation orientation) const
-{
-    return scrollSize(orientation);
-}
-
-float ScrollableArea::pixelStep(ScrollbarOrientation) const
-{
-    return 1;
-}
-
-} // namespace WebCore