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Found 1 result

  1. I'm building my first Phaser game and stumbled upon a conceptual issue I'm not sure how to solve best. Sometimes I want to wait for a tween to finish before I run the next bit, e.g. in a match 3 game I'd want to remove the matched blocks before dropping the rest and so on. Here's a snippet to illustrate how I've found it done in simple examples. function removeBlocks() { var duration = 1000; game.add.tween(...).to(..., duration, ...).onComplete(...); ...}function dropBlocks() { ...}removeBlocks();game.time.events.add(1000, dropBlocks);This works but there's an implicit dependency between the duration of the tween and the timer and any code run in the onComplete callback will race dropBlocks. The former could be fixed by passing the duration around but that's an implementation detail of removeBlocks that nothing else should depend on. The obvious way to make the dependency explicit is to use the onComplete callback. However, that means either passing dropBlocks to removeBlocks or exposing the tween to add the onComplete outside. Alternatively, one could introduce an onBlocksRemoved event that's triggered in the onComplete callback and add removeBlocks as a one-time listener. That hides the tween completely but feels like abusing the event system if this is the only callback and means writing code in the wrong order: game.onBlocksRemoved.add(dropBlocks);removeBlocks();Instead I'm currently returning a promise. function removeBlocks() { var tween = game.add.tween(...).to(...); var promise = new Promise(function (resolve) { tween.onComplete.add(function () { resolve(); }); });}removeBlocks() .then(dropBlocks) .then(...);I do like this solution a lot more than the alternatives because it hides the tween while making chained events readable but promises are usually defined by resolving to a value which is something I don't have or need. That may be a hint at me misusing promises here. I'd love to hear your opinion on my approach and some open questions / thoughts. 1. Is there an obvious solution that I'm missing because I'm still new to the framework? 2. When I'm tweening several things at once I could use Promise.all to continue once all tweens have finished but that might be me overthinking something simple.