Modify the size of the fabricjs text box to perfectly match the chosen text

Question

Modify the size of the fabricjs text box to perfectly match the chosen text

I'm currently facing an issue with my code snippet that is supposed to create a new Textbox:

new fabric.Textbox('Add some text')

The problem I'm encountering is that the text box appears too small compared to its content:

https://i.sstatic.net/koqcs.png

If I try setting a fixed width, then I end up with unwanted padding around the text:

new fabric.Textbox('Add some text', {width: 350})

https://i.sstatic.net/NYzX1.png

Is there a way for me to adjust the size of the text box to match the text selection size? I've tried looking for information on how to obtain the selection dimensions but haven't found anything useful so far.

The version of fabric I'm using is 4.0.0-beta.5.

javascript typescript fabricjs

Answer 1

Answer №1

One approach I'm currently using is to gradually increase the width until the text fits on just one line:

const text = new fabric.Textbox("Add some text")

while (text.textLines.length > 1) {
  text.set({width: text.getScaledWidth() + 1})
}

If you have a better solution, feel free to suggest it so that I can update the accepted answer.

[EDIT]

To adjust the text width during text editing:

function adjustTextWidth(evt: fabric.IEvent) {
  if (evt.target instanceof fabric.IText) {
    const text = evt.target.text || ""
    while (evt.target.textLines.length > text.split("\n").length) {
      evt.target.set({width: evt.target.getScaledWidth() + 1})
    }
  }
}

canvas.on("text:changed", adjustTextWidth)

https://i.sstatic.net/CDCtW.gif

[EDIT2]

I came across a more efficient method to achieve my objective:

fabric.Textbox.prototype._wordJoiners = /[]/;

This configuration ensures that spaces are not considered word joiners and text only breaks when the user presses Enter. Additionally, I included a function to adjust the textbox width when text is deleted:

function fitTextboxToContent(text: fabric.IText) {
  const textLinesMaxWidth = text.textLines.reduce((max, _, i) => Math.max(max, text.getLineWidth(i)), 0);
  text.set({width: textLinesMaxWidth});
}

Answer 2

One approach I'm currently using is to gradually increase the width until the text fits on just one line:

const text = new fabric.Textbox("Add some text")

while (text.textLines.length > 1) {
  text.set({width: text.getScaledWidth() + 1})
}

If you have a better solution, feel free to suggest it so that I can update the accepted answer.

[EDIT]

To adjust the text width during text editing:

function adjustTextWidth(evt: fabric.IEvent) {
  if (evt.target instanceof fabric.IText) {
    const text = evt.target.text || ""
    while (evt.target.textLines.length > text.split("\n").length) {
      evt.target.set({width: evt.target.getScaledWidth() + 1})
    }
  }
}

canvas.on("text:changed", adjustTextWidth)

https://i.sstatic.net/CDCtW.gif

[EDIT2]

I came across a more efficient method to achieve my objective:

fabric.Textbox.prototype._wordJoiners = /[]/;

This configuration ensures that spaces are not considered word joiners and text only breaks when the user presses Enter. Additionally, I included a function to adjust the textbox width when text is deleted:

function fitTextboxToContent(text: fabric.IText) {
  const textLinesMaxWidth = text.textLines.reduce((max, _, i) => Math.max(max, text.getLineWidth(i)), 0);
  text.set({width: textLinesMaxWidth});
}

Answer 3

Answer №2

In my quest for information regarding the TextBox feature, I was unable to find any built-in functionality that adjusts the container size based on the text content.

One workaround is to calculate the width of each line and if it falls below a specified maximum value, adjust the Text Box's width accordingly. It may also be necessary to add a slight buffer to ensure proper sizing.

var canvas = new fabric.Canvas("canvas");
var text = new fabric.Textbox("Add some text");

var textSize = 0;
for (var i = 0; i < text._textLines.length; i++) {
  textSize += text.measureLine(i).width;
}

var adjustedTextSize = textSize + 25;
if (adjustedTextSize < 500) {
  text.set({ width: adjustedTextSize });
}

canvas.add(text);
canvas.renderAll();

Take a look at this live example: https://codesandbox.io/s/stackoverflow-60411035-fabric-js-400-beta5-7s7id

It would be beneficial if a property like "max_width" existed for TextBox objects, allowing automatic adjustment of container size based on text length.

Answer 4

In my quest for information regarding the TextBox feature, I was unable to find any built-in functionality that adjusts the container size based on the text content.

One workaround is to calculate the width of each line and if it falls below a specified maximum value, adjust the Text Box's width accordingly. It may also be necessary to add a slight buffer to ensure proper sizing.

var canvas = new fabric.Canvas("canvas");
var text = new fabric.Textbox("Add some text");

var textSize = 0;
for (var i = 0; i < text._textLines.length; i++) {
  textSize += text.measureLine(i).width;
}

var adjustedTextSize = textSize + 25;
if (adjustedTextSize < 500) {
  text.set({ width: adjustedTextSize });
}

canvas.add(text);
canvas.renderAll();

Take a look at this live example: https://codesandbox.io/s/stackoverflow-60411035-fabric-js-400-beta5-7s7id

It would be beneficial if a property like "max_width" existed for TextBox objects, allowing automatic adjustment of container size based on text length.

Modify the size of the fabricjs text box to perfectly match the chosen text

Answer №1

Answer №2

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