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

3 files changed, 7 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/android/LayerAndroid.h b/WebCore/platform/graphics/android/LayerAndroid.h
index b74a8c8..712d699 100644
--- a/WebCore/platform/graphics/android/LayerAndroid.h
+++ b/WebCore/platform/graphics/android/LayerAndroid.h
@@ -135,6 +135,10 @@ public:
     void setForegroundClip(const SkRect& clip) {
         m_foregroundClip = clip;
     }
+
+    // Return the foreground clip offset by the position of the layer.
+    SkRect foregroundClip() const { return m_foregroundClip; }
+
     bool contentIsScrollable() const;
 
     // Returns true if the content position has changed.
diff --git a/WebCore/platform/graphics/android/android_graphics.cpp b/WebCore/platform/graphics/android/android_graphics.cpp
index fafd3df..a5dafda 100644
--- a/WebCore/platform/graphics/android/android_graphics.cpp
+++ b/WebCore/platform/graphics/android/android_graphics.cpp
@@ -140,7 +140,9 @@ bool CursorRing::setup()
         m_rings.clear();
         m_rings.append(m_bounds);
     }
+    m_absBounds = m_node->bounds(m_frame);
     m_bounds.inflate(SkScalarCeil(CURSOR_RING_OUTER_DIAMETER));
+    m_absBounds.inflate(SkScalarCeil(CURSOR_RING_OUTER_DIAMETER));
     if (!m_node->hasCursorRing() || (m_node->isPlugin() && m_node->isFocus()))
         return false;
     m_flavor = NORMAL_FLAVOR;
diff --git a/WebCore/platform/graphics/android/android_graphics.h b/WebCore/platform/graphics/android/android_graphics.h
index dbf1978..46c60e8 100644
--- a/WebCore/platform/graphics/android/android_graphics.h
+++ b/WebCore/platform/graphics/android/android_graphics.h
@@ -71,6 +71,7 @@ private:
     WebViewCore* m_viewImpl; // copy for convenience
     WTF::Vector<IntRect> m_rings;
     IntRect m_bounds;
+    IntRect m_absBounds;
     const CachedRoot* m_root;
     const CachedFrame* m_frame;
     const CachedNode* m_node;