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_COCOA_TABLE_ROW_NSIMAGE_CACHE_H_ 6 #define CHROME_BROWSER_UI_COCOA_TABLE_ROW_NSIMAGE_CACHE_H_ 7 #pragma once 8 9 #import <Cocoa/Cocoa.h> 10 11 #include "base/memory/scoped_nsobject.h" 12 13 class SkBitmap; 14 15 // There are several dialogs that display tabular data with one SkBitmap 16 // per row. This class converts these SkBitmaps to NSImages on demand, and 17 // caches the results. 18 class TableRowNSImageCache { 19 public: 20 // Interface this cache expects for its table model. 21 class Table { 22 public: 23 // Returns the number of rows in the table. 24 virtual int RowCount() const = 0; 25 26 // Returns the icon of the |row|th row. 27 virtual SkBitmap GetIcon(int row) const = 0; 28 29 protected: 30 virtual ~Table() {} 31 }; 32 33 // |model| must outlive the cache. 34 explicit TableRowNSImageCache(Table* model); 35 ~TableRowNSImageCache(); 36 37 // Lazily converts the image at the given row and caches it in |icon_images_|. 38 NSImage* GetImageForRow(int row); 39 40 // Call these functions every time the table changes, to update the cache. 41 void OnModelChanged(); 42 void OnItemsChanged(int start, int length); 43 void OnItemsAdded(int start, int length); 44 void OnItemsRemoved(int start, int length); 45 46 private: 47 // The table model we query for row count and icons. 48 Table* model_; // weak 49 50 // Stores strong NSImage refs for icons. If an entry is NULL, it will be 51 // created in GetImageForRow(). 52 scoped_nsobject<NSPointerArray> icon_images_; 53 }; 54 55 #endif // CHROME_BROWSER_UI_COCOA_TABLE_ROW_NSIMAGE_CACHE_H_ 56 57
