1 // Copyright 2014 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_VIEWS_PANELS_X11_PANEL_RESIZER_H_ 6 #define CHROME_BROWSER_UI_VIEWS_PANELS_X11_PANEL_RESIZER_H_ 7 8 #include "ui/events/event_handler.h" 9 #include "ui/gfx/point.h" 10 11 namespace aura { 12 class Window; 13 } 14 15 class Panel; 16 17 // EventHandler which implements special handling for resizing panels. Panels 18 // should use X11PanelResizer instead of X11WindowEventFilter. 19 // When resizing a panel: 20 // - The panel bounds should update in sync with the user's mouse movement 21 // during the resize operation. 22 // - The layout of all of the panels should be updated once the resize operation 23 // completes. 24 // X11PanelResizer does not hand off resizing to the window manager because it 25 // is not possible to determine when the window manager has finished resizing. 26 class X11PanelResizer : public ui::EventHandler { 27 public: 28 X11PanelResizer(Panel* panel, aura::Window* window); 29 virtual ~X11PanelResizer(); 30 31 private: 32 enum ResizeState { 33 NOT_RESIZING, 34 35 // The user has clicked on one of the panel's edges. 36 RESIZE_CAN_START, 37 38 // The user has dragged one of the panel's edges far enough for resizing to 39 // begin. 40 RESIZE_IN_PROGRESS 41 }; 42 43 // Called as a result of ET_MOUSE_PRESSED. 44 void OnMousePressed(ui::MouseEvent* event); 45 46 // Called as a result of ET_MOUSE_DRAGGED. 47 void OnMouseDragged(ui::MouseEvent* event); 48 49 // Stops the resize operation if one is in progress. Consumes |event| if it 50 // is not NULL and the resize operation was stopped. 51 void StopResizing(ui::MouseEvent* event, bool canceled); 52 53 // ui::EventHandler: 54 virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE; 55 56 // The panel being resized. 57 Panel* panel_; 58 59 // |panel|'s window. 60 aura::Window* window_; 61 62 ResizeState resize_state_; 63 64 // The edge that the user is resizing. 65 int resize_component_; 66 67 // The location of the mouse click on the window border. 68 gfx::Point initial_press_location_in_screen_; 69 70 DISALLOW_COPY_AND_ASSIGN(X11PanelResizer); 71 }; 72 73 #endif // CHROME_BROWSER_UI_VIEWS_PANELS_X11_PANEL_RESIZER_H_ 74