ui/views/controls/resize_area.h

   1 // Copyright (c) 2011 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 UI_VIEWS_CONTROLS_RESIZE_AREA_H_
   6 #define UI_VIEWS_CONTROLS_RESIZE_AREA_H_
   7
   8 #include <string>
   9
  10 #include "ui/views/view.h"
  11
  12 namespace views {
  13
  14 class ResizeAreaDelegate;
  15
  16 ////////////////////////////////////////////////////////////////////////////////
  17 //
  18 // An invisible area that acts like a horizontal resizer.
  19 //
  20 ////////////////////////////////////////////////////////////////////////////////
  21 class VIEWS_EXPORT ResizeArea : public View {
  22  public:
  23   static const char kViewClassName[];
  24
  25   explicit ResizeArea(ResizeAreaDelegate* delegate);
  26   ~ResizeArea() override;
  27
  28   // Overridden from views::View:
  29   const char* GetClassName() const override;
  30   gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override;
  31   bool OnMousePressed(const ui::MouseEvent& event) override;
  32   bool OnMouseDragged(const ui::MouseEvent& event) override;
  33   void OnMouseReleased(const ui::MouseEvent& event) override;
  34   void OnMouseCaptureLost() override;
  35   void GetAccessibleState(ui::AXViewState* state) override;
  36
  37  private:
  38   // Report the amount the user resized by to the delegate, accounting for
  39   // directionality.
  40   void ReportResizeAmount(int resize_amount, bool last_update);
  41
  42   // The delegate to notify when we have updates.
  43   ResizeAreaDelegate* delegate_;
  44
  45   // The mouse position at start (in screen coordinates).
  46   int initial_position_;
  47
  48   DISALLOW_COPY_AND_ASSIGN(ResizeArea);
  49 };
  50
  51 }  // namespace views
  52
  53 #endif  // UI_VIEWS_CONTROLS_RESIZE_AREA_H_