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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_UI_PANELS_PANEL_RESIZE_CONTROLLER_H_
      6 #define CHROME_BROWSER_UI_PANELS_PANEL_RESIZE_CONTROLLER_H_
      7 
      8 #include <set>
      9 #include "base/basictypes.h"
     10 #include "chrome/browser/ui/panels/panel_constants.h"
     11 #include "ui/gfx/point.h"
     12 #include "ui/gfx/rect.h"
     13 
     14 class Panel;
     15 class PanelManager;
     16 namespace gfx {
     17   class Rect;
     18 }
     19 
     20 // Responsible for handling resize operations initiated for all panels.
     21 class PanelResizeController {
     22  public:
     23   explicit PanelResizeController(PanelManager* panel_manager);
     24 
     25   // Resize the given panel.
     26   // |mouse_location| is in screen coordinate system.
     27   void StartResizing(Panel* panel,
     28                      const gfx::Point& mouse_location,
     29                      int component);
     30   void Resize(const gfx::Point& mouse_location);
     31 
     32   // Returns the panel that was resized.
     33   Panel* EndResizing(bool cancelled);
     34 
     35   // Asynchronous confirmation of panel having been closed.
     36   void OnPanelClosed(Panel* panel);
     37 
     38   bool IsResizing() const { return resizing_panel_ != NULL; }
     39 
     40  private:
     41   PanelManager* panel_manager_;  // Weak, owns us.
     42 
     43   // Panel currently being resized.
     44   Panel* resizing_panel_;
     45 
     46   // The part of the border used to resize the window.
     47   int component_;
     48 
     49   // The mouse location, in screen coordinates, when StartResizing
     50   // previously called.
     51   gfx::Point mouse_location_at_start_;
     52 
     53   // Bounds to restore the panel to if resize is cancelled.
     54   gfx::Rect bounds_at_start_;
     55 
     56   DISALLOW_COPY_AND_ASSIGN(PanelResizeController);
     57 };
     58 
     59 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_RESIZE_CONTROLLER_H_
     60