content/browser/web_contents/aura/gesture_nav_simple.h

   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   ~GestureNavSimple() override;
  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   gfx::Rect GetVisibleBounds() const override;
  39   // Returns true if the scroll update was consumed.
  40   bool OnOverscrollUpdate(float delta_x, float delta_y) override;
  41   void OnOverscrollComplete(OverscrollMode overscroll_mode) override;
  42   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_