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 <memory> 9 10 #include "base/macros.h" 11 #include "chrome/browser/ui/views/frame/browser_view.h" 12 #include "ui/views/widget/root_view.h" 13 14 class ToolbarView; 15 16 namespace ui { 17 class OSExchangeData; 18 } 19 20 // RootView implementation used by BrowserFrame. This forwards drop events to 21 // the TabStrip. Visually the tabstrip extends to the top of the frame, but in 22 // actually it doesn't. The tabstrip is only as high as a tab. To enable 23 // dropping above the tabstrip BrowserRootView forwards drop events to the 24 // TabStrip. 25 class BrowserRootView : public views::internal::RootView { 26 public: 27 struct DropIndex { 28 // The index within the tabstrip to drop on/before (see 29 // |insert_before_index| below). 30 int value = 0; 31 32 // If true, the dropped item should be inserted before |tab_index|. 33 // If false, the dropped item should replace the tab at |tab_index|. 34 bool drop_before = false; 35 36 bool operator==(const DropIndex& other) const { 37 return value == other.value && drop_before == other.drop_before; 38 } 39 }; 40 41 class DropTarget { 42 public: 43 virtual DropIndex GetDropIndex(const ui::DropTargetEvent& event) = 0; 44 virtual views::View* GetViewForDrop() = 0; 45 HandleDragUpdate(const base::Optional<DropIndex> & index)46 virtual void HandleDragUpdate(const base::Optional<DropIndex>& index) {} HandleDragExited()47 virtual void HandleDragExited() {} 48 49 protected: 50 DropTarget() = default; 51 virtual ~DropTarget() = default; 52 53 private: 54 DISALLOW_COPY_AND_ASSIGN(DropTarget); 55 }; 56 57 // Internal class name. 58 static const char kViewClassName[]; 59 60 // You must call set_tabstrip before this class will accept drops. 61 BrowserRootView(BrowserView* browser_view, views::Widget* widget); 62 ~BrowserRootView() override; 63 64 // views::View: 65 bool GetDropFormats(int* formats, 66 std::set<ui::ClipboardFormatType>* format_types) override; 67 bool AreDropTypesRequired() override; 68 bool CanDrop(const ui::OSExchangeData& data) override; 69 void OnDragEntered(const ui::DropTargetEvent& event) override; 70 int OnDragUpdated(const ui::DropTargetEvent& event) override; 71 void OnDragExited() override; 72 int OnPerformDrop(const ui::DropTargetEvent& event) override; 73 const char* GetClassName() const override; 74 bool OnMouseWheel(const ui::MouseWheelEvent& event) override; 75 void OnMouseExited(const ui::MouseEvent& event) override; 76 77 protected: 78 // views::View: 79 void PaintChildren(const views::PaintInfo& paint_info) override; 80 81 private: 82 FRIEND_TEST_ALL_PREFIXES(BrowserRootViewBrowserTest, ClearDropInfo); 83 84 // Used during a drop session of a url. Tracks the position of the drop. 85 struct DropInfo { 86 DropInfo(); 87 ~DropInfo(); 88 89 DropTarget* target = nullptr; 90 91 // Where to drop the url. 92 base::Optional<DropIndex> index; 93 94 // The URL for the drop event. 95 GURL url; 96 97 // Whether the MIME type of the file pointed to by |url| is supported. 98 // TODO(sangwoo108) Try removing this memeber. 99 bool file_supported = true; 100 }; 101 102 // ui::EventProcessor: 103 void OnEventProcessingStarted(ui::Event* event) override; 104 105 // Converts the event from the hosts coordinate system to the view's 106 // coordinate system. 107 DropIndex GetDropIndexForEvent(const ui::DropTargetEvent& event, 108 const ui::OSExchangeData& data, 109 DropTarget* target); 110 111 DropTarget* GetDropTarget(const ui::DropTargetEvent& event); 112 113 // Called to indicate whether the given URL is a supported file. 114 void OnFileSupported(const GURL& url, bool supported); 115 tabstrip()116 TabStrip* tabstrip() { return browser_view_->tabstrip(); } toolbar()117 ToolbarView* toolbar() { return browser_view_->toolbar(); } 118 119 // Returns true if |data| has string contents and the user can "paste and go". 120 // If |url| is non-null and the user can "paste and go", |url| is set to the 121 // desired destination. 122 bool GetPasteAndGoURL(const ui::OSExchangeData& data, GURL* url); 123 124 // The BrowserView. 125 BrowserView* browser_view_ = nullptr; 126 127 // Used to calculate partial offsets in scrolls that occur for a smooth 128 // scroll device. 129 int scroll_remainder_x_ = 0; 130 int scroll_remainder_y_ = 0; 131 132 std::unique_ptr<DropInfo> drop_info_; 133 134 base::WeakPtrFactory<BrowserRootView> weak_ptr_factory_{this}; 135 136 DISALLOW_COPY_AND_ASSIGN(BrowserRootView); 137 }; 138 139 #endif // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_ROOT_VIEW_H_ 140