src/chrome/browser/ui/panels/panel_resize_controller.h

   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                      panel::ResizingSides sides);
  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   // Resizing at which side?
  47   panel::ResizingSides sides_resized_;
  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_