What is the procedure for combining individual objects into a single, unified group that maintains its structure?

Question

What is the procedure for combining individual objects into a single, unified group that maintains its structure?

I'm currently using fabricjs version 1.7.21 and I have a button that allows me to add text to the canvas. I am wondering how I can add a group of objects, such as multiple editable IText fields (as shown on the right side), to the canvas just like I can with a single IText object.

In simpler terms, I want to be able to add elements similar to those on the right side by clicking a button and then moving them around as a group.

var canvas = new fabric.Canvas("c");
canvas.setHeight(500);
canvas.setWidth(500);

// Add Text
function Addtext() {
  var text = new fabric.IText("Type...", {
    fontSize: 30,
    top: 10,
    left: 10,
    width: 200,
    height: 200,
    textAlign: "center"
  });
  canvas.add(text);
  canvas.setActiveObject(text);
  text.enterEditing();
  text.selectAll();
  text.renderCursorOrSelection(); // or canvas.renderAll();
  canvas.isDrawingMode = false;
}

// Right Side Objects

// Header Constants
const toppers = {
  fontSize: 27,
  hasBorders: true,
  hasControls: false,
  left: 380,
  lockMovementX: true,
  lockMovementY: true,
  lockRotation: true,
  originX: "center",
  originY: "center",
  selectable: true,
  align: "mid",
  centeredScaling: true,
};
const headingOne = {
  lockMovementX: true,
  lockMovementY: true,
  originX: "center",
  originY: "center",
  selectable: true,
  align: "mid",
  fontSize: 14,
  fontStyle: "italic",
  hasBorders: true,
  hasControls: false,
  hasRotatingPoint: false,
  left: 380,
};
const headingTwo = {
  align: "mid",
  centeredScaling: true,
  fontSize: 20,
  hasBorders: true,
  hasControls: false,
  hasRotatingPoint: false,
  lockMovementX: true,
  lockMovementY: true,
  lockRotation: true,
  originX: "center",
  originY: "center",
  selectable: true,

  left: 380,
};

canvas.add(new fabric.IText("Some Text", {
  ...toppers,
  top: 25,
}));
canvas.add(new fabric.IText("Some Text", {
  ...toppers,
  fontWeight: "bold",
  top: 60,
}));
canvas.add(new fabric.IText("Some Text", { 
  ...headingOne,
  top: 90,
}));
canvas.add(new fabric.IText("Some Text", { 
  ...headingTwo,
  top: 110,
}));

canvas {
  border: 1px solid #dddddd;
  margin-top: 10px;
  border-radius: 3px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.7.21/fabric.min.js"></script>
<button onclick="Addtext()">Add Text</button>
<canvas id="c"></canvas>

javascript fabricjs

Answer 1

Answer №1

It seems like you're looking for a way to add a text field to a canvas and bind it to a group using a button. You can achieve this by following the code below:

var canvas = new fabric.Canvas("c");
canvas.setHeight(500);
canvas.setWidth(500);
canvas.isDrawingMode = false;
var myGroupOfText = new fabric.Group();

function Addtext() {
  var text = new fabric.IText("Type...", {
    fontSize: 30,
    top: 10,
    left: 10,
    width: 200,
    height: 200,
    textAlign: "center"
  });
  canvas.add(text);
  myGroupOfText.add(text);      
}

If you want to select the added text automatically, you can use the following code snippet:

canvas.setActiveObject(text);
text.enterEditing();
text.selectAll();

Remember that the 'add' method already includes a call to canvas.renderAll(), so there's no need to include it separately.

It's important not to confuse drawingMode with an imaginary insertionMode. The drawingMode setting in the canvas determines if free drawing is enabled, while re-setting it each time you add an IText is unnecessary unless there are specific constraints.

EDIT : Based on your feedback, you may find the following code useful:

 var canvas = new fabric.Canvas("c");
canvas.setHeight(500);
canvas.setWidth(500);
canvas.isDrawingMode = false;

[...]

function addGroupOfText() {
    var myGroupOfText = new fabric.Group();
    myGroupOfText.setOptions({selectable: true});
    var options = {
        fontSize: 30,
        top: 10,
        left: 10,
        width: 200,
        height: 200,
        textAlign: "center",
        selectable: false,
        fontWeight: normal, // or 'bold', or a number. see docs
        underline: false, // or true
        fontStyle: normal // or 'italic'. see docs
      }
    this.addText(myGroupOfText, options); // repeat this call as many time as needed
}

function addText(group, options) {
  var text = new fabric.IText("Type...", options);
  canvas.add(text);
  group.add(text);      
}

This code allows you to add multiple text fields and customize their options individually. For more information, refer to the documentation links provided. Feel free to ask for clarification in the comments if needed.

Answer 2

It seems like you're looking for a way to add a text field to a canvas and bind it to a group using a button. You can achieve this by following the code below:

var canvas = new fabric.Canvas("c");
canvas.setHeight(500);
canvas.setWidth(500);
canvas.isDrawingMode = false;
var myGroupOfText = new fabric.Group();

function Addtext() {
  var text = new fabric.IText("Type...", {
    fontSize: 30,
    top: 10,
    left: 10,
    width: 200,
    height: 200,
    textAlign: "center"
  });
  canvas.add(text);
  myGroupOfText.add(text);      
}

If you want to select the added text automatically, you can use the following code snippet:

canvas.setActiveObject(text);
text.enterEditing();
text.selectAll();

Remember that the 'add' method already includes a call to canvas.renderAll(), so there's no need to include it separately.

It's important not to confuse drawingMode with an imaginary insertionMode. The drawingMode setting in the canvas determines if free drawing is enabled, while re-setting it each time you add an IText is unnecessary unless there are specific constraints.

EDIT : Based on your feedback, you may find the following code useful:

 var canvas = new fabric.Canvas("c");
canvas.setHeight(500);
canvas.setWidth(500);
canvas.isDrawingMode = false;

[...]

function addGroupOfText() {
    var myGroupOfText = new fabric.Group();
    myGroupOfText.setOptions({selectable: true});
    var options = {
        fontSize: 30,
        top: 10,
        left: 10,
        width: 200,
        height: 200,
        textAlign: "center",
        selectable: false,
        fontWeight: normal, // or 'bold', or a number. see docs
        underline: false, // or true
        fontStyle: normal // or 'italic'. see docs
      }
    this.addText(myGroupOfText, options); // repeat this call as many time as needed
}

function addText(group, options) {
  var text = new fabric.IText("Type...", options);
  canvas.add(text);
  group.add(text);      
}

This code allows you to add multiple text fields and customize their options individually. For more information, refer to the documentation links provided. Feel free to ask for clarification in the comments if needed.

What is the procedure for combining individual objects into a single, unified group that maintains its structure?

Answer №1

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