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How to create a Textbox with crosshair cursor on moving objects using FabricJS?
In this tutorial, we are going to create a Textbox with a crosshair cursor on moving objects using FabricJS. Crosshair is one of the native cursor styles available which can be used in the FabricJS canvas too. FabricJS provides various types of cursors like default, all-scroll, crosshair, col-resize, row-resize, etc., which are reusing the native cursor underhood. The moveCursor property sets the style of the cursor when the object is moved around in the canvas.
Syntax
new fabric.Textbox(text: String, { moveCursor: String }: Object)
Parameters
-
text ? This parameter accepts a String which is the text string that we want to display inside our textbox.
-
options (optional) ? This parameter is an Object which provides additional customizations to our textbox. Using this parameter colour, cursor, stroke width and a lot of other properties can be changed related to the object of which moveCursor is a property.
Options Keys
-
moveCursor ? This property accepts a String which allows us to set the default cursor value when moving this textbox object on the canvas. The value determines the type of the cursor to be used on moving the canvas object.
Example 1: Default Cursor Value
By default, when we move around a textbox object in the canvas, the cursor type is move. Let's see a code example to understand this.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>Default cursor value when object is moved around the canvas</h2>
<p>Move the cursor around the textbox object and observe that the default cursor style is "move"</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiate a textbox object
var textbox = new fabric.Textbox("Stay hungry. Stay foolish.", {
backgroundColor: "#fffff0",
width: 400,
left: 110,
top: 70,
fill: "#e1a95f",
strokeWidth: 2,
stroke: "#a40000",
textAlign: "center",
});
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
Example 2: Using Crosshair Cursor
In this example, we are passing the moveCursor key to the textbox class with the value as "crosshair". This will make sure that as we move around our object in the canvas, the cursor value is crosshair.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>Passing the moveCursor property as key with a value</h2>
<p>Move the cursor around the textbox object and observe that now the cursor style has changed to "crosshair"</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiate a textbox object
var textbox = new fabric.Textbox("Stay hungry. Stay foolish.", {
backgroundColor: "#fffff0",
width: 300,
left: 110,
top: 70,
fill: "#e1a95f",
strokeWidth: 2,
stroke: "#a40000",
textAlign: "center",
moveCursor: "crosshair",
});
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
Key Points
- The default moveCursor value is "move" for textbox objects
- The moveCursor property only affects the cursor when moving the object, not when hovering
- Other cursor values like "pointer", "grab", "all-scroll" can also be used
- This property applies to all FabricJS objects, not just textboxes
Conclusion
The moveCursor property in FabricJS allows you to customize the cursor style when moving objects on the canvas. Setting it to "crosshair" provides precise visual feedback during object manipulation.
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