Prevents panels attached to shelf from docking

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 "ash/wm/drag_details.h"
+#include "ash/wm/window_state.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 {
-namespace wm {
-class WindowState;
-}
 
 // WindowResizer is used by ToplevelWindowEventFilter to handle dragging, moving
 // or resizing a window. All coordinates passed to this are in the parent
 // windows coordinates.
 class ASH_EXPORT WindowResizer {
  public:
   // Constants to identify the type of resize.
   static const int kBoundsChange_None;
   static const int kBoundsChange_Repositions;
   static const int kBoundsChange_Resizes;
 
   // Used to indicate which direction the resize occurs in.
   static const int kBoundsChangeDirection_None;
   static const int kBoundsChangeDirection_Horizontal;
   static const int kBoundsChangeDirection_Vertical;
 
   WindowResizer();
+  WindowResizer(wm::WindowState* window_state);
   virtual ~WindowResizer();
 
   // Returns a bitmask of the kBoundsChange_ values.
   static int GetBoundsChangeForWindowComponent(int component);
 
+  // Returns a bitmask of the kBoundsChange_ values.
+  static int GetPositionChangeDirectionForWindowComponent(int window_component);
+
   // Invoked to drag/move/resize the window. |location| is in the coordinates
   // of the window supplied to the constructor. |event_flags| is the event
   // flags from the event.
   virtual void Drag(const gfx::Point& location, int event_flags) = 0;
 
   // Invoked to complete the drag.
   virtual void CompleteDrag() = 0;
 
   // Reverts the drag.
   virtual void RevertDrag() = 0;
 
   // Returns the target window the resizer was created for.
-  virtual aura::Window* GetTarget() = 0;
+  aura::Window* GetTarget() const {
+    return window_state_ ? window_state_->window() : NULL;
+  }
 
-  // See comment for |Details::initial_location_in_parent|.
-  virtual const gfx::Point& GetInitialLocation() const = 0;
+  // See comment for |DragDetails::initial_location_in_parent|.
+  const gfx::Point& GetInitialLocation() const {
+    return window_state_->drag_details()->initial_location_in_parent;
+  }
+
+  // Drag parameters established when drag starts.
+  const DragDetails& details() const { return *window_state_->drag_details(); }
 
  protected:
-  struct Details {
-    Details();
-    Details(aura::Window* window,
-            const gfx::Point& location,
-            int window_component,
-            aura::client::WindowMoveSource source);
-    ~Details();
-
-    // The window we're resizing.
-    // TODO(oshima): replace this with accessor method to
-    // |window_state->window()|.
-    aura::Window* window;
-
-    // The ash window state for the |window| above.
-    wm::WindowState* window_state;
-
-    // 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.
-    gfx::Rect restore_bounds;
-
-    // Location passed to the constructor, in |window->parent()|'s coordinates.
-    gfx::Point initial_location_in_parent;
-
-    // Initial opacity of the window.
-    float initial_opacity;
-
-    // The component the user pressed on.
-    int window_component;
-
-    // Bitmask of the |kBoundsChange_| constants.
-    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);
+  gfx::Rect CalculateBoundsForDrag(const gfx::Point& location);
 
   static bool IsBottomEdge(int component);
 
+  // WindowState of the drag target.
+  wm::WindowState* window_state_;
+
  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);
+  void AdjustDeltaForTouchResize(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);
+  gfx::Point GetOriginForDrag(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);
+  gfx::Size GetSizeForDrag(int* delta_x, int* delta_y);
 
   // Returns the width of the window.
-  static int GetWidthForDrag(const Details& details,
-                             int min_width,
-                             int* delta_x);
+  int GetWidthForDrag(int min_width, int* delta_x);
 
   // Returns the height of the drag.
-  static int GetHeightForDrag(const Details& details,
-                              int min_height,
-                              int* delta_y);
+  int GetHeightForDrag(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,
     aura::client::WindowMoveSource source);
 
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_RESIZER_H_