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Using Dart's factory constructor feature to implement the singleton pattern
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| class DialogWindow extends Sprite { | |
| ResourceManager _resourceManager; | |
| static DialogWindow Instance; | |
| // factory constructor to ensure that there is always only one instance of DialogWindow | |
| factory DialogWindow(resourceManager) { | |
| return Instance != null ? Instance : new DialogWindow._internal(resourceManager); | |
| } | |
| DialogWindow._internal(this._resourceManager) { | |
| ... // initialization logic here | |
| Instance = this; | |
| } | |
| ... // rest of the class | |
| } |
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