Make touch-resizing windows to screen edge possible

ash/wm/window_resizer.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 ASH_WM_WINDOW_RESIZER_H_
 #define ASH_WM_WINDOW_RESIZER_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "ui/aura/client/window_move_client.h"
 #include "ui/gfx/rect.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ash {
 
 // WindowResizer is used by ToplevelWindowEventFilter to handle dragging, moving
 // or resizing a window. All coordinates passed to this are in the parent
@@ skipping 28 matching lines @@
   virtual void RevertDrag() = 0;
 
   // Returns the target window the resizer was created for.
   virtual aura::Window* GetTarget() = 0;
 
  protected:
   struct Details {
     Details();
     Details(aura::Window* window,
             const gfx::Point& location,
-            int window_component);
+            int window_component,
+            aura::client::WindowMoveSource source);
     ~Details();
 
     // The window we're resizing.
     aura::Window* window;
 
     // Initial bounds of the window in parent coordinates.
     gfx::Rect initial_bounds_in_parent;
 
     // Restore bounds (in screen coordinates) of the window before the drag
     // started. Only set if the window is normal and is being dragged.
@@ skipping 12 matching lines @@
     int bounds_change;
 
     // Bitmask of the |kBoundsChangeDirection_| constants.
     int position_change_direction;
 
     // Bitmask of the |kBoundsChangeDirection_| constants.
     int size_change_direction;
 
     // Will the drag actually modify the window?
     bool is_resizable;
+
+    // Source of the event initiating the drag.
+    aura::client::WindowMoveSource source;
   };
 
   static gfx::Rect CalculateBoundsForDrag(const Details& details,
                                           const gfx::Point& location);
 
   static gfx::Rect AdjustBoundsToGrid(const gfx::Rect& bounds,
                                       int grid_size);
 
   static bool IsBottomEdge(int component);
 
  private:
+  // In case of touch resizing, adjusts deltas so that the border is positioned
+  // just under the touch point.
+  static void AdjustDeltaForTouchResize(const Details& details,
+                                        int* delta_x,
+                                        int* delta_y);
+
   // Returns the new origin of the window. The arguments are the difference
   // between the current location and the initial location.
   static gfx::Point GetOriginForDrag(const Details& details,
                                      int delta_x,
                                      int delta_y);
 
   // Returns the size of the window for the drag.
   static gfx::Size GetSizeForDrag(const Details& details,
                                   int* delta_x,
                                   int* delta_y);
 
   // Returns the width of the window.
   static int GetWidthForDrag(const Details& details,
                              int min_width,
                              int* delta_x);
 
   // Returns the height of the drag.
   static int GetHeightForDrag(const Details& details,
                               int min_height,
                               int* delta_y);
 };
 
 // Creates a WindowResizer for |window|. This can return a scoped_ptr
 // initialized with NULL if |window| should not be resized nor dragged.
 ASH_EXPORT scoped_ptr<WindowResizer> CreateWindowResizer(
     aura::Window* window,
     const gfx::Point& point_in_parent,
-    int window_component);
+    int window_component,
+    aura::client::WindowMoveSource source);
 
 }  // namespace aura
 
 #endif  // ASH_WM_WINDOW_RESIZER_H_