我们在 Fabric.js 中有画布修改事件吗? [英] Do we have canvas Modified Event in Fabric.js?

问题描述

在 Fabric.js 中，我们有对象修改事件，例如 object:modified.整个画布是否有类似的事件.

In Fabric.js we have Object modified events like object:modified. Do we have similar event for the entire canvas.

实际上我正在尝试实现撤消和重做功能.如果画布上发生任何事情，我会将画布保存为 JSON，然后再次加载以进行撤消功能.

Actually I am trying to implement undo and redo features. I am saving the canvas as JSON if something happens on it and loading it again for undo feature.

对于 Fabric.js 中的这个特性，我们有什么更好的解决方案吗?

Do we have any better solution for this features in Fabric.js?

推荐答案

不要忘记检查添加/删除的对象.你可以这样实现它:

Don't forget to check for added/removed objects too. You could implement it like this:

var canvasModifiedCallback = function() {
console.log('canvas modified!');
};

canvas.on('object:added', canvasModifiedCallback);
canvas.on('object:removed', canvasModifiedCallback);
canvas.on('object:modified', canvasModifiedCallback);

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