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 CONTENT_BROWSER_WEB_CONTENTS_AURA_GESTURE_NAV_SIMPLE_H_ 6 #define CONTENT_BROWSER_WEB_CONTENTS_AURA_GESTURE_NAV_SIMPLE_H_ 7 8 #include "base/memory/scoped_ptr.h" 9 #include "content/browser/renderer_host/overscroll_controller_delegate.h" 10 11 namespace gfx { 12 class Transform; 13 } 14 15 namespace ui { 16 class Layer; 17 } 18 19 namespace content { 20 21 class ArrowLayerDelegate; 22 class WebContentsImpl; 23 24 // A simple delegate for the overscroll controller that paints an arrow on top 25 // of the web-contents as a hint for pending navigations from overscroll. 26 class GestureNavSimple : public OverscrollControllerDelegate { 27 public: 28 explicit GestureNavSimple(WebContentsImpl* web_contents); 29 virtual ~GestureNavSimple(); 30 31 private: 32 void ApplyEffectsAndDestroy(const gfx::Transform& transform, float opacity); 33 void AbortGestureAnimation(); 34 void CompleteGestureAnimation(); 35 bool ApplyEffectsForDelta(float delta_x); 36 37 // OverscrollControllerDelegate: 38 virtual gfx::Rect GetVisibleBounds() const OVERRIDE; 39 // Returns true if the scroll update was consumed. 40 virtual bool OnOverscrollUpdate(float delta_x, float delta_y) OVERRIDE; 41 virtual void OnOverscrollComplete(OverscrollMode overscroll_mode) OVERRIDE; 42 virtual void OnOverscrollModeChange(OverscrollMode old_mode, 43 OverscrollMode new_mode) OVERRIDE; 44 45 WebContentsImpl* web_contents_; 46 scoped_ptr<ui::Layer> clip_layer_; 47 scoped_ptr<ui::Layer> arrow_; 48 scoped_ptr<ArrowLayerDelegate> arrow_delegate_; 49 float completion_threshold_; 50 51 DISALLOW_COPY_AND_ASSIGN(GestureNavSimple); 52 }; 53 54 } // namespace content 55 56 #endif // CONTENT_BROWSER_WEB_CONTENTS_AURA_GESTURE_NAV_SIMPLE_H_ 57