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| 1 part of sprites; |
| 2 |
| 3 typedef void ImageMapCallback(ImageMap preloader); |
| 4 |
| 5 class ImageMap { |
| 6 |
| 7 Map<String, Image> _images; |
| 8 |
| 9 int _totalNumImages = 0; |
| 10 int _numLoadedImages = 0; |
| 11 |
| 12 ImageMapCallback _callback; |
| 13 |
| 14 ImageMap(List<String> urls, ImageMapCallback this._callback) { |
| 15 _images = new Map(); |
| 16 _totalNumImages = urls.length; |
| 17 urls.forEach(_addURL); |
| 18 } |
| 19 |
| 20 void _addURL(String url) { |
| 21 image_cache.load(url, (Image image) { |
| 22 // Store reference to image |
| 23 _images[url] = image; |
| 24 |
| 25 // Check if all images are loaded |
| 26 _numLoadedImages++; |
| 27 if (_numLoadedImages==_totalNumImages) { |
| 28 // Everything loaded, make callback |
| 29 _callback(this); |
| 30 } |
| 31 }); |
| 32 } |
| 33 |
| 34 Image getImage(String url) => _images[url]; |
| 35 |
| 36 Image operator [](String url) => _images[url]; |
| 37 } |
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