1 // Copyright (c) 2012 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 8 #import <Cocoa/Cocoa.h> 9 10 #include "base/mac/scoped_nsobject.h" 11 12 namespace gfx { 13 class ImageSkia; 14 } 15 16 // There are several dialogs that display tabular data with one SkBitmap 17 // per row. This class converts these SkBitmaps to NSImages on demand, and 18 // caches the results. 19 class TableRowNSImageCache { 20 public: 21 // Interface this cache expects for its table model. 22 class Table { 23 public: 24 // Returns the number of rows in the table. 25 virtual int RowCount() const = 0; 26 27 // Returns the icon of the |row|th row. 28 virtual gfx::ImageSkia GetIcon(int row) const = 0; 29 30 protected: ~Table()31 virtual ~Table() {} 32 }; 33 34 // |model| must outlive the cache. 35 explicit TableRowNSImageCache(Table* model); 36 ~TableRowNSImageCache(); 37 38 // Lazily converts the image at the given row and caches it in |icon_images_|. 39 NSImage* GetImageForRow(int row); 40 41 // Call these functions every time the table changes, to update the cache. 42 void OnModelChanged(); 43 void OnItemsChanged(int start, int length); 44 void OnItemsAdded(int start, int length); 45 void OnItemsRemoved(int start, int length); 46 47 private: 48 // The table model we query for row count and icons. 49 Table* model_; // weak 50 51 // Stores strong NSImage refs for icons. If an entry is NULL, it will be 52 // created in GetImageForRow(). 53 base::scoped_nsobject<NSPointerArray> icon_images_; 54 }; 55 56 #endif // CHROME_BROWSER_UI_COCOA_TABLE_ROW_NSIMAGE_CACHE_H_ 57