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我在fabric.js中有一个“双面”画布。它们都是从JSON字符串加载的。 我有一个函数来适应画布的窗口大小,这也调整了每个对象的大小。问题是当一个JSON中有一个imageblob时,它需要更多时间来加载。所以当我打电话给我的功能时,我最终会看到一个画布上的所有对象,而另一个画布上却没有。我已经完成了setTimeout,但这不是最好的解决方案。如何在没有settimeout的情况下在同一时间调整所有内容?这里是我的功能从JSON异步渲染Fabric.js
function fitWindow(){
var windowWidth = $("#wrapper").innerWidth();
var originalWidth = canvas.getWidth();
var originalHeight = canvas.getHeight();
var newWidth = windowWidth-30;
var newHeight = (originalHeight/originalWidth)* newWidth;
canvas.setWidth(newWidth);
canvas.setHeight(newHeight);
var myScale = originalWidth/newWidth;
var objects = canvas.getObjects();
for (var i in objects) {
var scaleX = objects[i].get('scaleX');
var scaleY = objects[i].get('scaleY');
var left = objects[i].get('left');
var top = objects[i].get('top');
var tempScaleX = scaleX * (1/myScale);
var tempScaleY = scaleY * (1/myScale);
var tempLeft = left * (1/myScale);
var tempTop = top * (1/myScale);
objects[i].set('scaleX',tempScaleX);
objects[i].set('scaleY',tempScaleY);
objects[i].set('left',tempLeft);
objects[i].set('top',tempTop);
objects[i].setCoords();
}
canvas.renderAll();
var ojS = canvas.toObject(['name']);
var savedCanvas = JSON.stringify(ojS);
canvas.clear();
canvas.loadFromJSON(canvas2, canvas.renderAll.bind(canvas));
setTimeout(function(){
var objects2 = canvas.getObjects();
for (var k in objects2) {
var scaleX2 = objects2[k].get('scaleX');
var scaleY2 = objects2[k].get('scaleY');
var left2 = objects2[k].get('left');
var top2 = objects2[k].get('top');
var tempScaleX2 = scaleX2 * (1/myScale);
var tempScaleY2 = scaleY2 * (1/myScale);
var tempLeft2 = left2 * (1/myScale);
var tempTop2 = top2 * (1/myScale);
objects2[k].set('scaleX',tempScaleX2);
objects2[k].set('scaleY',tempScaleY2);
objects2[k].set('left',tempLeft2);
objects2[k].set('top',tempTop2);
objects2[k].setCoords();
}
canvas.renderAll();
var ojS2 = canvas.toObject(['name']);
canvas2 = JSON.stringify(ojS2);
canvas.clear();
canvas.loadFromJSON(savedCanvas, canvas.renderAll.bind(canvas));
canvas.renderAll();
},100);
}