chrome/browser/ui/views/frame/browser_root_view.h

   1 // Copyright (c) 2012 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_FRAME_BROWSER_ROOT_VIEW_H_
   6 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_ROOT_VIEW_H_
   7
   8 #include "ui/views/widget/root_view.h"
   9
  10 class BrowserView;
  11 class TabStrip;
  12
  13 namespace ui {
  14 class OSExchangeData;
  15 }
  16
  17 // RootView implementation used by BrowserFrame. This forwards drop events to
  18 // the TabStrip. Visually the tabstrip extends to the top of the frame, but in
  19 // actually it doesn't. The tabstrip is only as high as a tab. To enable
  20 // dropping above the tabstrip BrowserRootView forwards drop events to the
  21 // TabStrip.
  22 class BrowserRootView : public views::internal::RootView {
  23  public:
  24   // Internal class name.
  25   static const char kViewClassName[];
  26
  27   // You must call set_tabstrip before this class will accept drops.
  28   BrowserRootView(BrowserView* browser_view, views::Widget* widget);
  29
  30   // Overridden from views::View:
  31   bool GetDropFormats(
  32       int* formats,
  33       std::set<ui::OSExchangeData::CustomFormat>* custom_formats) override;
  34   bool AreDropTypesRequired() override;
  35   bool CanDrop(const ui::OSExchangeData& data) override;
  36   void OnDragEntered(const ui::DropTargetEvent& event) override;
  37   int OnDragUpdated(const ui::DropTargetEvent& event) override;
  38   void OnDragExited() override;
  39   int OnPerformDrop(const ui::DropTargetEvent& event) override;
  40   const char* GetClassName() const override;
  41   bool OnMouseWheel(const ui::MouseWheelEvent& event) override;
  42
  43  private:
  44   // ui::EventProcessor:
  45   void OnEventProcessingStarted(ui::Event* event) override;
  46
  47   // Returns true if the event should be forwarded to the tabstrip.
  48   bool ShouldForwardToTabStrip(const ui::DropTargetEvent& event);
  49
  50   // Converts the event from the hosts coordinate system to the tabstrips
  51   // coordinate system.
  52   ui::DropTargetEvent* MapEventToTabStrip(
  53       const ui::DropTargetEvent& event,
  54       const ui::OSExchangeData& data);
  55
  56   inline TabStrip* tabstrip() const;
  57
  58   // Returns true if |data| has string contents and the user can "paste and go".
  59   // If |url| is non-null and the user can "paste and go", |url| is set to the
  60   // desired destination.
  61   bool GetPasteAndGoURL(const ui::OSExchangeData& data, GURL* url);
  62
  63   // The BrowserView.
  64   BrowserView* browser_view_;
  65
  66   // If true, drag and drop events are being forwarded to the tab strip.
  67   // This is used to determine when to send OnDragEntered and OnDragExited
  68   // to the tab strip.
  69   bool forwarding_to_tab_strip_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(BrowserRootView);
  72 };
  73
  74 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_ROOT_VIEW_H_