Scroll with Layers in views::ScrollView

ui/views/view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
 
 #include "ui/views/view.h"
 
 #include <algorithm>
 #include <cmath>
@@ skipping 428 matching lines @@
     OnEnabledChanged();
   }
 }
 
 void View::OnEnabledChanged() {
   SchedulePaint();
 }
 
 // Transformations -------------------------------------------------------------
 
 gfx::Transform View::GetTransform() const {

[tapted, 2016/08/05 07:12:31]

This is new since patchset 8 too. Without it events are incorrectly offset when
the view has scrolled. Included test coverage.

-  return layer() ? layer()->transform() : gfx::Transform();
+  if (!layer())
+    return gfx::Transform();
+
+  gfx::Transform transform = layer()->transform();
+  gfx::ScrollOffset scroll_offset = layer()->CurrentScrollOffset();
+  transform.Translate(-scroll_offset.x(), -scroll_offset.y());
+  return transform;
 }
 
 void View::SetTransform(const gfx::Transform& transform) {
   if (transform.IsIdentity()) {
     if (layer()) {
       layer()->SetTransform(transform);
       if (!paint_to_layer_)
         DestroyLayer();
     } else {
       // Nothing.
@@ skipping 1959 matching lines @@
   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   gfx::Point widget_location(event.location());
   ConvertPointToWidget(this, &widget_location);
   widget->RunShellDrag(this, data, widget_location, drag_operations, source);
   // WARNING: we may have been deleted.
   return true;
 }
 
 }  // namespace views