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// Copyright (c) 2011 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.
#ifndef CHROME_BROWSER_UI_COCOA_TABLE_ROW_NSIMAGE_CACHE_H_
#define CHROME_BROWSER_UI_COCOA_TABLE_ROW_NSIMAGE_CACHE_H_
#pragma once
#import <Cocoa/Cocoa.h>
#include "base/memory/scoped_nsobject.h"
class SkBitmap;
// 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 {
public:
// Interface this cache expects for its table model.
class Table {
public:
// 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;
protected:
virtual ~Table() {}
};
// |model| must outlive the cache.
explicit TableRowNSImageCache(Table* model);
~TableRowNSImageCache();
// 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);
private:
// 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_;
};
#endif // CHROME_BROWSER_UI_COCOA_TABLE_ROW_NSIMAGE_CACHE_H_
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