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 UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_ 6 #define UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_ 7 8 #include <string> 9 10 #include "base/strings/string16.h" 11 #include "base/time/time.h" 12 #include "ui/views/background.h" 13 #include "ui/views/controls/button/label_button.h" 14 15 namespace views { 16 17 class MenuButtonListener; 18 19 //////////////////////////////////////////////////////////////////////////////// 20 // 21 // MenuButton 22 // 23 // A button that shows a menu when the left mouse button is pushed 24 // 25 //////////////////////////////////////////////////////////////////////////////// 26 class VIEWS_EXPORT MenuButton : public LabelButton { 27 public: 28 static const char kViewClassName[]; 29 30 // How much padding to put on the left and right of the menu marker. 31 static const int kMenuMarkerPaddingLeft; 32 static const int kMenuMarkerPaddingRight; 33 34 // Create a Button. 35 MenuButton(ButtonListener* listener, 36 const base::string16& text, 37 MenuButtonListener* menu_button_listener, 38 bool show_menu_marker); 39 virtual ~MenuButton(); 40 show_menu_marker()41 bool show_menu_marker() const { return show_menu_marker_; } set_menu_marker(const gfx::ImageSkia * menu_marker)42 void set_menu_marker(const gfx::ImageSkia* menu_marker) { 43 menu_marker_ = menu_marker; 44 } menu_marker()45 const gfx::ImageSkia* menu_marker() const { return menu_marker_; } 46 menu_offset()47 const gfx::Point& menu_offset() const { return menu_offset_; } set_menu_offset(int x,int y)48 void set_menu_offset(int x, int y) { menu_offset_.SetPoint(x, y); } 49 50 // Activate the button (called when the button is pressed). 51 virtual bool Activate(); 52 53 // Overridden from View: 54 virtual gfx::Size GetPreferredSize() const OVERRIDE; 55 virtual const char* GetClassName() const OVERRIDE; 56 virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE; 57 virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE; 58 virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE; 59 virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE; 60 virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE; 61 virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE; 62 virtual bool OnKeyReleased(const ui::KeyEvent& event) OVERRIDE; 63 virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE; 64 65 protected: 66 // Paint the menu marker image. 67 void PaintMenuMarker(gfx::Canvas* canvas); 68 69 // Overridden from LabelButton: 70 virtual gfx::Rect GetChildAreaBounds() OVERRIDE; 71 72 // True if the menu is currently visible. 73 bool menu_visible_; 74 75 // Offset of the associated menu position. 76 gfx::Point menu_offset_; 77 78 private: 79 friend class TextButtonBackground; 80 81 // Compute the maximum X coordinate for the current screen. MenuButtons 82 // use this to make sure a menu is never shown off screen. 83 int GetMaximumScreenXCoordinate(); 84 85 // We use a time object in order to keep track of when the menu was closed. 86 // The time is used for simulating menu behavior for the menu button; that 87 // is, if the menu is shown and the button is pressed, we need to close the 88 // menu. There is no clean way to get the second click event because the 89 // menu is displayed using a modal loop and, unlike regular menus in Windows, 90 // the button is not part of the displayed menu. 91 base::TimeTicks menu_closed_time_; 92 93 // Our listener. Not owned. 94 MenuButtonListener* listener_; 95 96 // Whether or not we're showing a drop marker. 97 bool show_menu_marker_; 98 99 // The down arrow used to differentiate the menu button from normal 100 // text buttons. 101 const gfx::ImageSkia* menu_marker_; 102 103 // If non-null the destuctor sets this to true. This is set while the menu is 104 // showing and used to detect if the menu was deleted while running. 105 bool* destroyed_flag_; 106 107 DISALLOW_COPY_AND_ASSIGN(MenuButton); 108 }; 109 110 } // namespace views 111 112 #endif // UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_ 113