看见的行为
初始化后,我在更新组内的画布元素时遇到问题。我创建了一个基本应用程序,该应用程序在初始化时会创建一个包含几个元素的组:字体图标(文本对象),标题,描述和矩形,以便为该组创建边框。
是否有解决此问题的方法,不需要我删除该组并将其重新添加到画布上?阅读faricjs文档canvas.renderAll
后,我应该缺少什么?
预期行为
呈现给DOM的Group对象需要根据DOM中文本对象的新宽度来调整其宽度。本质上是重新渲染该单个组对象,而不会导致画布中所有其他对象的完全重新渲染。
问题复制演示
我能够在此处复制问题:http://jsfiddle.net/almogKashany/k6f758nm/
使用setTimeout
我更新了组的标题,但是组的标题没有更新(即使在调用group.setCoords
或canvas.renderAll
之后]
SOLUTION
感谢@Durga
更改了rect或文本值的宽度后调用addWithUpdate,因此它将重新计算组尺寸。
DEMO
var canvas = new fabric.StaticCanvas('c', {
renderOnAddRemove: false
});
var leftBoxIconWidth = 70;
var placeholderForIcon = new fabric.Text('ICON', {
fontSize: 20,
fontWeight: 400,
fontFamily: 'Roboto-Medium',
left: 10,
top: 20,
originX: 'left',
lineHeight: '1',
width: 50,
height: 30,
backgroundColor: 'brown'
});
var title = new fabric.Text('', {
fontSize: 20,
fontWeight: 400,
fontFamily: 'Roboto-Medium',
left: leftBoxIconWidth,
top: 5,
originX: 'left',
lineHeight: '1',
});
var description = new fabric.Text('', {
fontSize: 20,
fontWeight: 400,
fontFamily: 'Roboto-Medium',
left: leftBoxIconWidth,
top: 25,
originX: 'left',
lineHeight: '1',
});
title.set({
text: 'init title'
});
description.set({
text: 'init description'
});
var groupRect = new fabric.Rect({
left: 0,
top: 0,
width: Math.max(title.width, description.width) + leftBoxIconWidth, // 70 is placeholder for icon
height: 70,
strokeWidth: 3,
stroke: '#f44336',
fill: '#999',
originX: 'left',
originY: 'top',
rx: 7,
ry: 7,
})
let card = new fabric.Group([groupRect, title, description, placeholderForIcon]);
canvas.add(card);
canvas.requestRenderAll();
setTimeout(function() {
title.set({
text: 'change title after first render and more a lot text text text text'
});
groupRect.set({
width: Math.max(title.width, description.width) + leftBoxIconWidth
})
card.addWithUpdate();
// here missing how to update group/rect inside group width after title changed
// to update canvas well
canvas.requestRenderAll();
}, 2000)
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.4.0/fabric.min.js"></script>
<canvas id="c" width="500" height="500" style="border:1px solid #ccc"></canvas>