
在本文中,我们将学习如何在 FabricJS 中禁用画布的交互性。每个对象之上的交互层是 FabricJS 的独特功能之一。一旦我们初始化了画布,就可以选择对象、拖动它们或操作组选择。但是,所有这一切都可以通过将交互属性指定为 False 来撤消。
语法
new fabric.Canvas(element: HTMLElement|String, { interactive : Boolean }: Object)参数
元素 - 此参数是
选项(可选) - 此参数是一个对象,它提供对我们的画布进行额外的定制。使用此参数,可以更改与画布相关的颜色、光标、边框宽度等属性,以及许多其他属性,其中 Interactive 是我们可以决定是否需要交互式画布的属性。该属性的默认值为 True。
示例 1
启用交互属性时
启用交互性后,我们可以自由拖动对象、选择它们并根据需要操作它们。我们可以在下面的代码示例中看到 -
<!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>Disabling the interactivity of canvas</h2>
<p>Here you can drag the object and manipulate them freely as we have set the <b>interactive</b> property to True. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas", {
interactive: true,
});
// Creating an instance of the fabric.Rect class
var obj1 = new fabric.Rect({
left: 170,
top: 90,
width: 60,
height: 80,
fill: "#966fd6",
angle: 90,
});
var obj2 = new fabric.Rect({
left: 200,
top: 120,
width: 60,
height: 80,
fill: "#ffa343",
angle: 56,
});
// Adding it to the canvas
canvas.add(obj1);
canvas.add(obj2);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>示例 2
将交互键传递给类
让我们看一个代码示例,了解如何禁用画布的交互性。我们可以为交互属性分配一个 False 值,这将消除画布中对象顶部的交互层。
<!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>Disabling the interactivity of canvas</h2>
<p>Here you cannot select an area around the objects and manipulate them freely, as we have set the <b>interactive</b> property as False. </b>
</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas", {
interactive: false,
});
// Creating an instance of the fabric.Rect class
var obj1 = new fabric.Rect({
left: 170,
top: 90,
width: 60,
height: 80,
fill: "#966fd6",
angle: 90,
});
var obj2 = new fabric.Rect({
left: 200,
top: 120,
width: 60,
height: 80,
fill: "#ffa343",
angle: 56,
});
// Adding it to the canvas
canvas.add(obj1);
canvas.add(obj2);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>










