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 UI_APP_LIST_PAGINATION_CONTROLLER_H_ 6 #define UI_APP_LIST_PAGINATION_CONTROLLER_H_ 7 8 #include "ui/app_list/app_list_export.h" 9 10 namespace gfx { 11 class Vector2d; 12 class Rect; 13 } 14 15 namespace ui { 16 class GestureEvent; 17 } 18 19 namespace app_list { 20 21 class PaginationModel; 22 23 // Receives user scroll events from various sources (mouse wheel, touchpad, 24 // touch gestures) and manipulates a PaginationModel as necessary. 25 class APP_LIST_EXPORT PaginationController { 26 public: 27 enum ScrollAxis { SCROLL_AXIS_HORIZONTAL, SCROLL_AXIS_VERTICAL }; 28 29 // Creates a PaginationController. Does not take ownership of |model|. The 30 // |model| is required to outlive this PaginationController. |scroll_axis| 31 // specifies the axis in which the pages will scroll. 32 PaginationController(PaginationModel* model, ScrollAxis scroll_axis); 33 scroll_axis()34 ScrollAxis scroll_axis() const { return scroll_axis_; } 35 36 // Handles a mouse wheel or touchpad scroll event in the area represented by 37 // the PaginationModel. |offset| is the number of units scrolled in each axis. 38 // Returns true if the event was captured and there was some room to scroll. 39 bool OnScroll(const gfx::Vector2d& offset); 40 41 // Handles a touch gesture event in the area represented by the 42 // PaginationModel. Returns true if the event was captured. 43 bool OnGestureEvent(const ui::GestureEvent& event, const gfx::Rect& bounds); 44 45 private: 46 PaginationModel* pagination_model_; // Not owned. 47 ScrollAxis scroll_axis_; 48 }; 49 50 } // namespace app_list 51 52 #endif // UI_APP_LIST_PAGINATION_CONTROLLER_H_ 53