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// Copyright (c) 2010 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.


#import <Cocoa/Cocoa.h>

#include "base/scoped_nsobject.h"
#include "third_party/skia/include/core/SkBitmap.h"

// There are several dialogs that display tabular data with one SkBitmap
// per row. This class converts these SkBitmaps to NSImages on demand, and
// caches the results.
class TableRowNSImageCache {
   // Interface this cache expects for its table model.
   class Table {
     // Returns the number of rows in the table.
     virtual int RowCount() const = 0;

     // Returns the icon of the |row|th row.
     virtual SkBitmap GetIcon(int row) const = 0;

  // |model| must outlive the cache.
  explicit TableRowNSImageCache(Table* model);

  // Lazily converts the image at the given row and caches it in |icon_images_|.
  NSImage* GetImageForRow(int row);

  // Call these functions every time the table changes, to update the cache.
  void OnModelChanged();
  void OnItemsChanged(int start, int length);
  void OnItemsAdded(int start, int length);
  void OnItemsRemoved(int start, int length);

  // The table model we query for row count and icons.
  Table* model_;  // weak

  // Stores strong NSImage refs for icons. If an entry is NULL, it will be
  // created in GetImageForRow().
  scoped_nsobject<NSPointerArray> icon_images_;


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