Draggable region support for frameless app window on CrOS.

ui/aura/window.h

 // 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.
 
 #ifndef UI_AURA_WINDOW_H_
 #define UI_AURA_WINDOW_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/string16.h"
 #include "ui/aura/aura_export.h"
 #include "ui/aura/client/window_types.h"
 #include "ui/base/events.h"
 #include "ui/base/gestures/gesture_types.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/compositor/layer_delegate.h"
 #include "ui/compositor/layer_owner.h"
 #include "ui/compositor/layer_type.h"
 #include "ui/gfx/insets.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/rect.h"
 
 class SkCanvas;
+class SkRegion;
 
 namespace gfx {
 class Display;
 }
 
 namespace ui {
 class Layer;
 class Texture;
 class Transform;
 }
@@ skipping 217 matching lines @@
   // Sets the window to grab hits for an area extending |insets| pixels inside
   // its bounds (even if that inner region overlaps a child window). This can be
   // used to create an invisible non-client area that overlaps the client area.
   void set_hit_test_bounds_override_inner(const gfx::Insets& insets) {
     hit_test_bounds_override_inner_ = insets;
   }
   gfx::Insets hit_test_bounds_override_inner() const {
     return hit_test_bounds_override_inner_;
   }
 
+  // The region specified can be used to drag the window.
+  // The window will take the ownership of the specified region.
+  void SetDraggableRegion(SkRegion* region);

[Ben Goodger (Google), 2012/08/17 17:10:24]

Aura is agnostic of things that relate specifically to a window manager, such as
draggable regions. This type of thing really belongs in Ash.

+
   // Returns true if the |point_in_root| in root window's coordinate falls
   // within this window's bounds. Returns false if the window is detached
   // from root window.
   bool ContainsPointInRoot(const gfx::Point& point_in_root) const;
 
   // Returns true if relative-to-this-Window's-origin |local_point| falls
   // within this Window's bounds.
   bool ContainsPoint(const gfx::Point& local_point) const;
 
   // Returns true if the mouse pointer at relative-to-this-Window's-origin
   // |local_point| can trigger an event for this Window.
   // TODO(beng): A Window can supply a hit-test mask to cause some portions of
   // itself to not trigger events, causing the events to fall through to the
   // Window behind.
   bool HitTest(const gfx::Point& local_point);
 
   // Returns the Window that most closely encloses |local_point| for the
   // purposes of event targeting.
-  Window* GetEventHandlerForPoint(const gfx::Point& local_point);
+  Window* GetEventHandlerForPoint(const gfx::Point& local_point,
+                                  ui::EventType event_type);
 
   // Returns the topmost Window with a delegate containing |local_point|.
   Window* GetTopWindowContainingPoint(const gfx::Point& local_point);
 
   // Returns this window's toplevel window (the highest-up-the-tree anscestor
   // that has a delegate set).  The toplevel window may be |this|.
   Window* GetToplevelWindow();
 
   // Claims or relinquishes the claim to focus.
   void Focus();
@@ skipping 78 matching lines @@
   // Updates the visible state of the layer, but does not make visible-state
   // specific changes. Called from Show()/Hide().
   void SetVisible(bool visible);
 
   // Schedules a paint for the Window's entire bounds.
   void SchedulePaint();
 
   // Gets a Window (either this one or a subwindow) containing |local_point|.
   // If |return_tightest| is true, returns the tightest-containing (i.e.
   // furthest down the hierarchy) Window containing the point; otherwise,
-  // returns the loosest.  If |for_event_handling| is true, then hit-test masks
-  // are honored; otherwise, only bounds checks are performed.
+  // returns the loosest.  If |event_type| is provided (!ET_UNKNOWN), then
+  // hit-test masks are honored; otherwise, only bounds checks are performed.
   Window* GetWindowForPoint(const gfx::Point& local_point,
                             bool return_tightest,
-                            bool for_event_handling);
+                            ui::EventType event_type);
 
   // Implementation of RemoveChild(). If |child| is being removed as the result
   // of an add, |new_parent| is the new parent |child| is going to be parented
   // to.
   void RemoveChildImpl(Window* child, Window* new_parent);
 
   // Called when this window's parent has changed.
   void OnParentChanged();
 
   // Determines the real location for stacking |child| and invokes
@@ skipping 75 matching lines @@
   void* user_data_;
 
   // Makes the window pass all events through to any windows behind it.
   bool ignore_events_;
 
   // See set_hit_test_outer_override().
   gfx::Insets hit_test_bounds_override_outer_mouse_;
   gfx::Insets hit_test_bounds_override_outer_touch_;
   gfx::Insets hit_test_bounds_override_inner_;
 
+  // Region that can be used to drag the window.
+  scoped_ptr<SkRegion> draggable_region_;
+
   ObserverList<WindowObserver> observers_;
 
   // Value struct to keep the name and deallocator for this property.
   // Key cannot be used for this purpose because it can be char* or
   // WindowProperty<>.
   struct Value {
     const char* name;
     intptr_t value;
     PropertyDeallocator deallocator;
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_H_