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      1 // Copyright (c) 2011 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_BOOKMARKS_BOOKMARK_BAR_INSTRUCTIONS_VIEW_H_
      6 #define CHROME_BROWSER_UI_VIEWS_BOOKMARKS_BOOKMARK_BAR_INSTRUCTIONS_VIEW_H_
      7 #pragma once
      8 
      9 #include "ui/base/accessibility/accessible_view_state.h"
     10 #include "views/controls/link.h"
     11 #include "views/view.h"
     12 
     13 namespace views {
     14 class Label;
     15 class Link;
     16 }
     17 
     18 // BookmarkBarInstructionsView is a child of the bookmark bar that is visible
     19 // when the user has no bookmarks on the bookmark bar.
     20 // BookmarkBarInstructionsView shows a description of the bookmarks bar along
     21 // with a link to import bookmarks. Clicking the link results in notifying the
     22 // delegate.
     23 class BookmarkBarInstructionsView : public views::View,
     24                                     public views::LinkController {
     25  public:
     26   // The delegate is notified once the user clicks on the link to import
     27   // bookmarks.
     28   class Delegate {
     29    public:
     30     virtual void ShowImportDialog() = 0;
     31 
     32    protected:
     33     virtual ~Delegate() {}
     34   };
     35 
     36   explicit BookmarkBarInstructionsView(Delegate* delegate);
     37 
     38   // View overrides.
     39   virtual gfx::Size GetPreferredSize() OVERRIDE;
     40   virtual void Layout() OVERRIDE;
     41   virtual void OnThemeChanged() OVERRIDE;
     42   virtual void ViewHierarchyChanged(bool is_add,
     43                                     views::View* parent,
     44                                     views::View* child) OVERRIDE;
     45   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
     46 
     47   // LinkController.
     48   virtual void LinkActivated(views::Link* source, int event_flags) OVERRIDE;
     49 
     50  private:
     51   void UpdateColors();
     52 
     53   Delegate* delegate_;
     54 
     55   views::Label* instructions_;
     56   views::Link* import_link_;
     57 
     58   // The baseline of the child views. This is -1 if none of the views support a
     59   // baseline.
     60   int baseline_;
     61 
     62   // Have the colors of the child views been updated? This is initially false
     63   // and set to true once we have a valid ThemeProvider.
     64   bool updated_colors_;
     65 
     66   DISALLOW_COPY_AND_ASSIGN(BookmarkBarInstructionsView);
     67 };
     68 
     69 #endif  // CHROME_BROWSER_UI_VIEWS_BOOKMARKS_BOOKMARK_BAR_INSTRUCTIONS_VIEW_H_
     70