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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <vector>
#include "base/observer_list.h"
#include "ui/app_list/app_list_export.h"
#include "ui/app_list/app_list_item_list_observer.h"
#include "ui/app_list/app_list_item_observer.h"
#include "ui/gfx/image/image_skia.h"
namespace gfx {
class Rect;
namespace app_list {
class AppListItem;
class AppListItemList;
class APP_LIST_EXPORT FolderImageObserver {
// Called when the folder icon has changed.
virtual void OnFolderImageUpdated() {}
virtual ~FolderImageObserver() {}
// The icon for an app list folder, dynamically generated by drawing the
// folder's items inside a circle. Automatically keeps itself up to date, and
// notifies observers when it changes.
class APP_LIST_EXPORT FolderImage : public AppListItemListObserver,
public AppListItemObserver {
explicit FolderImage(AppListItemList* item_list);
~FolderImage() override;
// Generates the folder's icon from the icons of the items in the item list,
// and notifies observers that the icon has changed.
void UpdateIcon();
const gfx::ImageSkia& icon() const { return icon_; }
// Returns the icon of one of the top items with |item_index|.
const gfx::ImageSkia& GetTopIcon(size_t item_index) const;
// Calculates the top item icons' bounds inside |folder_icon_bounds|.
// Returns the bounds of top item icons in sequence of top left, top right,
// bottom left, bottom right.
static std::vector<gfx::Rect> GetTopIconsBounds(
const gfx::Rect& folder_icon_bounds);
// Returns the target icon bounds for |item| to fly back to its parent folder
// icon in animation UI. If |item| is one of the top item icon, this will
// match its corresponding top item icon in the folder icon. Otherwise,
// the target icon bounds is centered at the |folder_icon_bounds| with
// the same size of the top item icon.
// The Rect returned is in the same coordinates of |folder_icon_bounds|.
gfx::Rect GetTargetIconRectInFolderForItem(
AppListItem* item,
const gfx::Rect& folder_icon_bounds) const;
void AddObserver(FolderImageObserver* observer);
void RemoveObserver(FolderImageObserver* observer);
// AppListItemObserver overrides:
void ItemIconChanged() override;
// AppListItemListObserver overrides:
void OnListItemAdded(size_t index, AppListItem* item) override;
void OnListItemRemoved(size_t index, AppListItem* item) override;
void OnListItemMoved(size_t from_index,
size_t to_index,
AppListItem* item) override;
// Updates the folder's icon from the icons of |top_items_| and calls
// OnFolderImageUpdated. Does not refresh the |top_items_| list, so should
// only be called if the |item_list_| has not been changed (see UpdateIcon).
void RedrawIconAndNotify();
// The icon image.
gfx::ImageSkia icon_;
// List of top-level app list items (to display small in the icon).
AppListItemList* item_list_;
// Top items for generating folder icon.
std::vector<AppListItem*> top_items_;
base::ObserverList<FolderImageObserver> observers_;
} // namespace app_list