CODEWITHSUNDEEP
javascripthtmlcsscanvasfabricjs
almog kashany
almog kashany

Reputation: 71

FabricJS - Why after updating text inside group, the group width does not automatically adjust its width accordingly

Seen Behavior

I have an issue with updating canvas elements inside a group after initialization. I created a basic app that on initialization creates a group containing several elements: font icon(text object), title, description and rect in order to create a border for the group.

Is there any way to solve this problem that dosen't require me to remove and re add the group back to the canvas? after reading faricjs documentation canvas.renderAll should be enough what am i missing?

Expected Behavior

The Group object that is rendered to the DOM needs to adjust its width according to the new width of the text object in the DOM. Essentially re-render this individual group object without causing a full re-render of all the other objects in the canvas.

Issue Reproduction Demo

I was able to reproduce the issue here: http://jsfiddle.net/almogKashany/k6f758nm/

Using setTimeout I update the title of the group but the title of the group does not update (even after calling group.setCoords or canvas.renderAll)

SOLUTION

Thanks to @Durga

http://jsfiddle.net/gyfxckzp/

Upvotes: 5

Views: 2818

Answers (1)

Durga
Durga

Reputation: 15604

Call addWithUpdate after changing width of rect or text value, so it will recalculate the group dimension.

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>

Upvotes: 7

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