Enable navigation in scrollable layers.

EventHandler:
  * Added IgnoreClipping in order to touch nodes that are clipped
    out.

android_graphics:
  * Remember the absolute bounds of the node for invals.

RenderBox:
  * Fix a compiler warning.

RenderLayer:
  * Do not record the entire layer contents unless the scroll
    dimensions are larger than the client dimensions.
  * Change isSelfPaintingLayer to check for an overflow clip
    instead of the scrollable dimensions since it can be too
    early to check at this point.

RenderLayerCompositor:
  * Same as RenderLayer for checking the overflow clip.

WebViewCore:
  * Scroll the containing layer to the node bounds and offset the
    mouse position if scrolled.  Once the mouse event is processed,
    restore the layer to 0,0.

CacheBuilder:
  * The body position is no longer used.
  * Do not clip out nodes if the layer is scrollable.

CachedFrame:
  * Add unadjustBounds to restore adjusted bounds to their original
    position (fixed position elements).
  * Call unadjustBounds when a node has been found.  This new set of
    bounds is passed over to WebViewCore to handle clicks.
  * Reject empty node bounds.

CachedLayer:
  * Document adjustBounds and add unadjustBounds.  Add in the scroll
    position to the node bounds.

CachedRoot:
  * Unadjust the mouse bounds.

WebView:
  * Unadjust the mouse bounds and use the absolute bounds of the ring
    during inval.

Bug: 1566791
Change-Id: Ia55f2cbb61869087176d3ff61882e40324614c6a

1 files changed, 14 insertions, 0 deletions

diff --git a/WebCore/page/EventHandler.cpp b/WebCore/page/EventHandler.cpp
index 89e9424..e2fab6e 100644
--- a/WebCore/page/EventHandler.cpp
+++ b/WebCore/page/EventHandler.cpp
@@ -1257,7 +1257,14 @@ bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent)
     }
     m_mouseDownWasInSubframe = false;
 
+#if ENABLE(COMPOSITED_FIXED_ELEMENTS)
+    // Add IgnoreClipping because fixed position elements are moved only on the
+    // UI thread.  Nodes in fixed position elements are clipped out by the view
+    // without IgnoreClipping.
+    HitTestRequest request(HitTestRequest::Active | HitTestRequest::IgnoreClipping);
+#else
     HitTestRequest request(HitTestRequest::Active);
+#endif
     // Save the document point we generate in case the window coordinate is invalidated by what happens 
     // when we dispatch the event.
     IntPoint documentPoint = documentPointForWindowPoint(m_frame, mouseEvent.pos());
@@ -1575,7 +1582,14 @@ bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent)
         return m_lastScrollbarUnderMouse->mouseUp();
     }
 
+#if ENABLE(COMPOSITED_FIXED_ELEMENTS)
+    // Add IgnoreClipping because fixed position elements are moved only on the
+    // UI thread.  Nodes in fixed position elements are clipped out by the view
+    // without IgnoreClipping.
+    HitTestRequest request(HitTestRequest::MouseUp | HitTestRequest::IgnoreClipping);
+#else
     HitTestRequest request(HitTestRequest::MouseUp);
+#endif
     MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);
     Frame* subframe = m_capturingMouseEventsNode.get() ? subframeForTargetNode(m_capturingMouseEventsNode.get()) : subframeForHitTestResult(mev);
     if (m_eventHandlerWillResetCapturingMouseEventsNode)