1 files changed, 65 insertions, 0 deletions
diff --git a/chromium/ash/wm/resize_shadow_controller.h b/chromium/ash/wm/resize_shadow_controller.h
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index 00000000000..1eccf4c8364
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+++ b/chromium/ash/wm/resize_shadow_controller.h
@@ -0,0 +1,65 @@
+// 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 ASH_WM_RESIZE_SHADOW_CONTROLLER_H_
+#define ASH_WM_RESIZE_SHADOW_CONTROLLER_H_
+
+#include <map>
+
+#include "ash/ash_export.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/linked_ptr.h"
+#include "ui/aura/window_observer.h"
+
+namespace aura {
+class Window;
+}
+
+namespace ash {
+namespace internal {
+
+class ResizeShadow;
+
+// ResizeShadowController observes changes to resizable windows and shows
+// a resize handle visual effect when the cursor is near the edges.
+class ASH_EXPORT ResizeShadowController : public aura::WindowObserver {
+ public:
+  ResizeShadowController();
+  virtual ~ResizeShadowController();
+
+  // Shows the appropriate shadow for a given |window| and |hit_test| location.
+  void ShowShadow(aura::Window* window, int hit_test);
+
+  // Hides the shadow for a |window|, if it has one.
+  void HideShadow(aura::Window* window);
+
+  ResizeShadow* GetShadowForWindowForTest(aura::Window* window);
+
+  // aura::WindowObserver overrides:
+  virtual void OnWindowBoundsChanged(
+      aura::Window* window,
+      const gfx::Rect& old_bounds,
+      const gfx::Rect& new_bounds) OVERRIDE;
+  virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
+
+ private:
+  typedef std::map<aura::Window*, linked_ptr<ResizeShadow> > WindowShadowMap;
+
+  // Creates a shadow for a given window and returns it.  |window_shadows_|
+  // owns the memory.
+  ResizeShadow* CreateShadow(aura::Window* window);
+
+  // Returns the resize shadow for |window| or NULL if no shadow exists.
+  ResizeShadow* GetShadowForWindow(aura::Window* window);
+
+  WindowShadowMap window_shadows_;
+
+  DISALLOW_COPY_AND_ASSIGN(ResizeShadowController);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_WM_RESIZE_SHADOW_CONTROLLER_H_