ui/app_list/folder_image.h

   1 // Copyright 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 UI_APP_LIST_FOLDER_IMAGE_H_
   6 #define UI_APP_LIST_FOLDER_IMAGE_H_
   7
   8 #include <vector>
   9
  10 #include "base/observer_list.h"
  11 #include "ui/app_list/app_list_export.h"
  12 #include "ui/app_list/app_list_item_list_observer.h"
  13 #include "ui/app_list/app_list_item_observer.h"
  14 #include "ui/gfx/image/image_skia.h"
  15
  16 namespace gfx {
  17 class Rect;
  18 }
  19
  20 namespace app_list {
  21
  22 class AppListItem;
  23 class AppListItemList;
  24
  25 class APP_LIST_EXPORT FolderImageObserver {
  26  public:
  27   // Called when the folder icon has changed.
  28   virtual void OnFolderImageUpdated() {}
  29
  30  protected:
  31   virtual ~FolderImageObserver() {}
  32 };
  33
  34 // The icon for an app list folder, dynamically generated by drawing the
  35 // folder's items inside a circle. Automatically keeps itself up to date, and
  36 // notifies observers when it changes.
  37 class APP_LIST_EXPORT FolderImage : public AppListItemListObserver,
  38                                     public AppListItemObserver {
  39  public:
  40   explicit FolderImage(AppListItemList* item_list);
  41   ~FolderImage() override;
  42
  43   // Generates the folder's icon from the icons of the items in the item list,
  44   // and notifies observers that the icon has changed.
  45   void UpdateIcon();
  46
  47   const gfx::ImageSkia& icon() const { return icon_; }
  48
  49   // Returns the icon of one of the top items with |item_index|.
  50   const gfx::ImageSkia& GetTopIcon(size_t item_index) const;
  51
  52   // Calculates the top item icons' bounds inside |folder_icon_bounds|.
  53   // Returns the bounds of top item icons in sequence of top left, top right,
  54   // bottom left, bottom right.
  55   static std::vector<gfx::Rect> GetTopIconsBounds(
  56       const gfx::Rect& folder_icon_bounds);
  57
  58   // Returns the target icon bounds for |item| to fly back to its parent folder
  59   // icon in animation UI. If |item| is one of the top item icon, this will
  60   // match its corresponding top item icon in the folder icon. Otherwise,
  61   // the target icon bounds is centered at the |folder_icon_bounds| with
  62   // the same size of the top item icon.
  63   // The Rect returned is in the same coordinates of |folder_icon_bounds|.
  64   gfx::Rect GetTargetIconRectInFolderForItem(
  65       AppListItem* item,
  66       const gfx::Rect& folder_icon_bounds) const;
  67
  68   void AddObserver(FolderImageObserver* observer);
  69   void RemoveObserver(FolderImageObserver* observer);
  70
  71   // AppListItemObserver overrides:
  72   void ItemIconChanged() override;
  73
  74   // AppListItemListObserver overrides:
  75   void OnListItemAdded(size_t index, AppListItem* item) override;
  76   void OnListItemRemoved(size_t index, AppListItem* item) override;
  77   void OnListItemMoved(size_t from_index,
  78                        size_t to_index,
  79                        AppListItem* item) override;
  80
  81  private:
  82   // Updates the folder's icon from the icons of |top_items_| and calls
  83   // OnFolderImageUpdated. Does not refresh the |top_items_| list, so should
  84   // only be called if the |item_list_| has not been changed (see UpdateIcon).
  85   void RedrawIconAndNotify();
  86
  87   // The icon image.
  88   gfx::ImageSkia icon_;
  89
  90   // List of top-level app list items (to display small in the icon).
  91   AppListItemList* item_list_;
  92
  93   // Top items for generating folder icon.
  94   std::vector<AppListItem*> top_items_;
  95
  96   base::ObserverList<FolderImageObserver> observers_;
  97 };
  98
  99 }  // namespace app_list
 100
 101 #endif  // UI_APP_LIST_FOLDER_IMAGE_H_