Implement CSSOM Smooth Scroll API

Source/core/rendering/RenderListBox.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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.
@@ skipping 81 matching lines @@
     ASSERT(isHTMLSelectElement(element));
 
     if (FrameView* frameView = frame()->view())
         frameView->addScrollableArea(this);
 }
 
 RenderListBox::~RenderListBox()
 {
     setHasVerticalScrollbar(false);
 
-    if (FrameView* frameView = frame()->view())
+    if (FrameView* frameView = frame()->view()) {
         frameView->removeScrollableArea(this);
+        frameView->removeAnimatingScrollableArea(this);
+    }
 }
 
 // FIXME: Instead of this hack we should add a ShadowRoot to <select> with no insertion point
 // to prevent children from rendering.
 bool RenderListBox::isChildAllowed(RenderObject* object, RenderStyle*) const
 {
     return object->isAnonymous() && !object->isRenderFullScreen();
 }
 
 inline HTMLSelectElement* RenderListBox::selectElement() const
@@ skipping 588 matching lines @@
 LayoutUnit RenderListBox::scrollHeight() const
 {
     return std::max(clientHeight(), listHeight());
 }
 
 LayoutUnit RenderListBox::scrollLeft() const
 {
     return 0;
 }
 
-void RenderListBox::setScrollLeft(LayoutUnit)
+void RenderListBox::setScrollLeft(LayoutUnit, ScrollBehavior)
 {
 }
 
 LayoutUnit RenderListBox::scrollTop() const
 {
     return m_indexOffset * itemHeight();
 }
 
-void RenderListBox::setScrollTop(LayoutUnit newTop)
+void RenderListBox::setScrollTop(LayoutUnit newTop, ScrollBehavior scrollBehavior)
 {
+    cancelProgrammaticScrollAnimation();
+
     // Determine an index and scroll to it.
     int index = newTop / itemHeight();
     if (index < 0 || index >= numItems() || index == m_indexOffset)
         return;
 
-    scrollToOffsetWithoutAnimation(VerticalScrollbar, index);
+    if (scrollBehavior == ScrollBehaviorAuto)
+        scrollBehavior = style()->scrollBehavior();
+    if (scrollBehavior == ScrollBehaviorSmooth)
+        programmaticallyScrollSmoothlyToOffset(FloatPoint(0, index));
+    else
+        scrollToOffsetWithoutAnimation(VerticalScrollbar, index);
 }
 
 bool RenderListBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
 {
     if (!RenderBlockFlow::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, hitTestAction))
         return false;
     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
     int size = numItems();
     LayoutPoint adjustedLocation = accumulatedOffset + location();
 
@@ skipping 139 matching lines @@
 }
 
 bool RenderListBox::scrollbarsCanBeActive() const
 {
     RenderView* view = this->view();
     if (!view)
         return false;
     return view->frameView()->scrollbarsCanBeActive();
 }
 
+void RenderListBox::registerForAnimation()
+{
+    frameView()->addAnimatingScrollableArea(this);
+}
+
+void RenderListBox::deregisterForAnimation()
+{
+    if (FrameView* frameView = this->frameView())
+        frameView->removeAnimatingScrollableArea(this);
+}
+
+bool RenderListBox::scheduleAnimation()
+{
+    return frameView()->scheduleAnimation();
+}
+
 IntPoint RenderListBox::minimumScrollPosition() const
 {
     return IntPoint();
 }
 
 IntPoint RenderListBox::maximumScrollPosition() const
 {
     return IntPoint(0, std::max(numItems() - numVisibleItems(), 0));
 }
 
@@ skipping 120 matching lines @@
 {
     return itemBoundingBoxRectInternal(point, listIndexToRenderListBoxIndex(index));
 }
 
 bool RenderListBox::scrollToRevealElementAtListIndex(int index)
 {
     return scrollToRevealElementAtListIndexInternal(listIndexToRenderListBoxIndex(index));
 }
 
 } // namespace WebCore