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      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_BOOKMARKS_BOOKMARK_TAB_HELPER_H_
      6 #define CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_TAB_HELPER_H_
      7 
      8 #include "chrome/browser/bookmarks/base_bookmark_model_observer.h"
      9 #include "content/public/browser/web_contents_observer.h"
     10 #include "content/public/browser/web_contents_user_data.h"
     11 
     12 struct BookmarkNodeData;
     13 class BookmarkTabHelperDelegate;
     14 
     15 namespace content {
     16 class WebContents;
     17 }
     18 
     19 // Per-tab class to manage bookmarks.
     20 class BookmarkTabHelper
     21     : public BaseBookmarkModelObserver,
     22       public content::WebContentsObserver,
     23       public content::WebContentsUserData<BookmarkTabHelper> {
     24  public:
     25   // Interface for forwarding bookmark drag and drop to extenstions.
     26   class BookmarkDrag {
     27    public:
     28     virtual void OnDragEnter(const BookmarkNodeData& data) = 0;
     29     virtual void OnDragOver(const BookmarkNodeData& data) = 0;
     30     virtual void OnDragLeave(const BookmarkNodeData& data) = 0;
     31     virtual void OnDrop(const BookmarkNodeData& data) = 0;
     32 
     33    protected:
     34     virtual ~BookmarkDrag() {}
     35   };
     36 
     37   virtual ~BookmarkTabHelper();
     38 
     39   void set_delegate(BookmarkTabHelperDelegate* delegate) {
     40     delegate_ = delegate;
     41   }
     42 
     43   // It is up to callers to call set_bookmark_drag_delegate(NULL) when
     44   // |bookmark_drag| is deleted since this class does not take ownership of
     45   // |bookmark_drag|.
     46   void set_bookmark_drag_delegate(BookmarkDrag* bookmark_drag) {
     47     bookmark_drag_ = bookmark_drag;
     48   }
     49   BookmarkDrag* bookmark_drag_delegate() { return bookmark_drag_; }
     50 
     51   bool is_starred() const { return is_starred_; }
     52 
     53   // Returns true if the bookmark bar should be shown detached.
     54   bool ShouldShowBookmarkBar() const;
     55 
     56  private:
     57   friend class content::WebContentsUserData<BookmarkTabHelper>;
     58 
     59   explicit BookmarkTabHelper(content::WebContents* web_contents);
     60 
     61   // Updates the starred state from the BookmarkModel. If the state has changed,
     62   // the delegate is notified.
     63   void UpdateStarredStateForCurrentURL();
     64 
     65   // Overridden from BaseBookmarkModelObserver:
     66   virtual void BookmarkModelChanged() OVERRIDE;
     67   virtual void Loaded(BookmarkModel* model, bool ids_reassigned) OVERRIDE;
     68   virtual void BookmarkNodeAdded(BookmarkModel* model,
     69                                  const BookmarkNode* parent,
     70                                  int index) OVERRIDE;
     71   virtual void BookmarkNodeRemoved(BookmarkModel* model,
     72                                    const BookmarkNode* parent,
     73                                    int old_index,
     74                                    const BookmarkNode* node) OVERRIDE;
     75   virtual void BookmarkAllNodesRemoved(BookmarkModel* model) OVERRIDE;
     76 
     77   virtual void BookmarkNodeChanged(BookmarkModel* model,
     78                                    const BookmarkNode* node) OVERRIDE;
     79 
     80   // Overridden from content::WebContentsObserver:
     81   virtual void DidNavigateMainFrame(
     82       const content::LoadCommittedDetails& details,
     83       const content::FrameNavigateParams& params) OVERRIDE;
     84 
     85   // Whether the current URL is starred.
     86   bool is_starred_;
     87 
     88   BookmarkModel* bookmark_model_;
     89 
     90   // Our delegate, to notify when the url starred changed.
     91   BookmarkTabHelperDelegate* delegate_;
     92 
     93   // The BookmarkDrag is used to forward bookmark drag and drop events to
     94   // extensions.
     95   BookmarkDrag* bookmark_drag_;
     96 
     97   DISALLOW_COPY_AND_ASSIGN(BookmarkTabHelper);
     98 };
     99 
    100 #endif  // CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_TAB_HELPER_H_
    101