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      1 // Copyright (c) 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_LINK_DISAMBIGUATION_LINK_DISAMBIGUATION_POPUP_H_
      6 #define CHROME_BROWSER_UI_VIEWS_LINK_DISAMBIGUATION_LINK_DISAMBIGUATION_POPUP_H_
      7 
      8 #include "content/public/browser/web_contents_view_delegate.h"
      9 #include "ui/gfx/geometry/rect.h"
     10 
     11 namespace aura {
     12 class Window;
     13 }
     14 
     15 namespace ui {
     16 class MouseEvent;
     17 }
     18 
     19 // Creates a popup with a zoomed bitmap rendered by Blink of an area in web
     20 // |content| that received an ambiguous Gesture event. This allows the user to
     21 // select which of the links their first Gesture event overlapped. The popup
     22 // generates a new Gesture event which is sent back to the provided |callback|.
     23 class LinkDisambiguationPopup {
     24  public:
     25   LinkDisambiguationPopup();
     26   ~LinkDisambiguationPopup();
     27 
     28   // Creates and shows the Popup. |zoomed_bitmap| is the scaled-up image of the
     29   // ambiguous web content. |target_rect| is the original, unzoomed rectangle
     30   // in DIPs in the coordinate system of |content|. We will convert received
     31   // gestures in the popup to the coordinate system of |content| and as an
     32   // offset within |target_rect|, and then call the |callback| with the
     33   // transformed coordinates GestureEvent.
     34   void Show(const SkBitmap& zoomed_bitmap,
     35             const gfx::Rect& target_rect,
     36             const gfx::NativeView content,
     37             const base::Callback<void(ui::GestureEvent*)>& gesture_cb,
     38             const base::Callback<void(ui::MouseEvent*)>& mouse_cb);
     39   void Close();
     40 
     41  private:
     42   class ZoomBubbleView;
     43 
     44   // It is possible that |view_| can be destroyed by its widget instead of
     45   // closed explicitly by us. In that case we need to be notified that it has
     46   // been destroyed so we can invalidate our own pointer to that view.
     47   void InvalidateBubbleView();
     48 
     49   // A non-owning pointer to the calling window that contains the unzoomed web
     50   // content bitmap, that we will be sending the GestureEvents received back to.
     51   const aura::Window* content_;
     52   ZoomBubbleView* view_;
     53 
     54   DISALLOW_COPY_AND_ASSIGN(LinkDisambiguationPopup);
     55 };
     56 
     57 #endif  // CHROME_BROWSER_UI_VIEWS_LINK_DISAMBIGUATION_LINK_DISAMBIGUATION_POPUP_H_
     58