自定义控件文本框

Question

对于我的画布元素，我使用库Fabric.js。我尝试添加自定义功能和图标，我需要一点帮助。在Fabric的官方网站上，你可以看到开发文档。我已经阅读了文档，并在笔中编写了此程序(见剪辑)

var canvas = this.__canvas = new fabric.Canvas('c');
// create a rect object
var deleteIcon = "data:image/svg+xml,%3C%3Fxml version='1.0' encoding='utf-8'%3F%3E%3C!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.1//EN' 'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd'%3E%3Csvg version='1.1' id='Ebene_1' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' x='0px' y='0px' width='595.275px' height='595.275px' viewBox='200 215 230 470' xml:space='preserve'%3E%3Ccircle style='fill:%23F44336;' cx='299.76' cy='439.067' r='218.516'/%3E%3Cg%3E%3Crect x='267.162' y='307.978' transform='matrix(0.7071 -0.7071 0.7071 0.7071 -222.6202 340.6915)' style='fill:white;' width='65.545' height='262.18'/%3E%3Crect x='266.988' y='308.153' transform='matrix(0.7071 0.7071 -0.7071 0.7071 398.3889 -83.3116)' style='fill:white;' width='65.544' height='262.179'/%3E%3C/g%3E%3C/svg%3E";
var cloneIcon = "data:image/svg+xml,%3C%3Fxml version='1.0' encoding='iso-8859-1'%3F%3E%3Csvg version='1.1' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' viewBox='0 0 55.699 55.699' width='100px' height='100px' xml:space='preserve'%3E%3Cpath style='fill:%23010002;' d='M51.51,18.001c-0.006-0.085-0.022-0.167-0.05-0.248c-0.012-0.034-0.02-0.067-0.035-0.1 c-0.049-0.106-0.109-0.206-0.194-0.291v-0.001l0,0c0,0-0.001-0.001-0.001-0.002L34.161,0.293c-0.086-0.087-0.188-0.148-0.295-0.197 c-0.027-0.013-0.057-0.02-0.086-0.03c-0.086-0.029-0.174-0.048-0.265-0.053C33.494,0.011,33.475,0,33.453,0H22.177 c-3.678,0-6.669,2.992-6.669,6.67v1.674h-4.663c-3.678,0-6.67,2.992-6.67,6.67V49.03c0,3.678,2.992,6.669,6.67,6.669h22.677 c3.677,0,6.669-2.991,6.669-6.669v-1.675h4.664c3.678,0,6.669-2.991,6.669-6.669V18.069C51.524,18.045,51.512,18.025,51.51,18.001z M34.454,3.414l13.655,13.655h-8.985c-2.575,0-4.67-2.095-4.67-4.67V3.414z M38.191,49.029c0,2.574-2.095,4.669-4.669,4.669H10.845 c-2.575,0-4.67-2.095-4.67-4.669V15.014c0-2.575,2.095-4.67,4.67-4.67h5.663h4.614v10.399c0,3.678,2.991,6.669,6.668,6.669h10.4 v18.942L38.191,49.029L38.191,49.029z M36.777,25.412h-8.986c-2.574,0-4.668-2.094-4.668-4.669v-8.985L36.777,25.412z M44.855,45.355h-4.664V26.412c0-0.023-0.012-0.044-0.014-0.067c-0.006-0.085-0.021-0.167-0.049-0.249 c-0.012-0.033-0.021-0.066-0.036-0.1c-0.048-0.105-0.109-0.205-0.194-0.29l0,0l0,0c0-0.001-0.001-0.002-0.001-0.002L22.829,8.637 c-0.087-0.086-0.188-0.147-0.295-0.196c-0.029-0.013-0.058-0.021-0.088-0.031c-0.086-0.03-0.172-0.048-0.263-0.053 c-0.021-0.002-0.04-0.013-0.062-0.013h-4.614V6.67c0-2.575,2.095-4.67,4.669-4.67h10.277v10.4c0,3.678,2.992,6.67,6.67,6.67h10.399 v21.616C49.524,43.26,47.429,45.355,44.855,45.355z'/%3E%3C/svg%3E%0A"
var deleteImg = document.createElement('img');
deleteImg.src = deleteIcon;
var cloneImg = document.createElement('img');
cloneImg.src = cloneIcon;
fabric.Object.prototype.transparentCorners = false;
fabric.Object.prototype.cornerColor = 'blue';
fabric.Object.prototype.cornerStyle = 'circle';

var rect = new fabric.Rect({
left: 100,
top: 50,
fill: 'yellow',
width: 200,
height: 100,
objectCaching: false,
stroke: 'lightgreen',
strokeWidth: 4,
});
canvas.add(rect);
canvas.setActiveObject(rect);

function renderIcon(icon) {
return function renderIcon(ctx, left, top, styleOverride, fabricObject) {
var size = this.cornerSize;
ctx.save();
ctx.translate(left, top);
ctx.rotate(fabric.util.degreesToRadians(fabricObject.angle));
ctx.drawImage(icon, -size/2, -size/2, size, size);
ctx.restore();
}
}
fabric.Object.prototype.controls.deleteControl = new fabric.Control({
x: 0.5,
y: -0.5,
offsetY: -16,
offsetX: 16,
cursorStyle: 'pointer',
mouseUpHandler: deleteObject,
render: renderIcon(deleteImg),
cornerSize: 24
});
fabric.Object.prototype.controls.clone = new fabric.Control({
x: -0.5,
y: -0.5,
offsetY: -16,
offsetX: -16,
cursorStyle: 'pointer',
mouseUpHandler: cloneObject,
render: renderIcon(cloneImg),
cornerSize: 24
});

function deleteObject(eventData, transform) {
var target = transform.target;
var canvas = target.canvas;
canvas.remove(target);
canvas.requestRenderAll();
}
function cloneObject(eventData, transform) {
var target = transform.target;
var canvas = target.canvas;
target.clone(function(cloned) {
cloned.left += 10;
cloned.top += 10;
canvas.add(cloned);
});
}
var text = new fabric.Textbox('Add Icons', {
cursorColor :"blue",
top:200,
left:150,
lockMovementY: false,
height: 200,
});
canvas.add(text);
canvas.setActiveObject(text);

<script src="https://unpkg.com/fabric@latest/dist/fabric.js"></script>
<canvas id="c" width="400" height="300" style="border:1px solid #ccc"></canvas>

但是代码只对形状起作用，对文本框不起作用我已经寻找了一个解决方案，但不能找到这个。谁能帮我这个忙?

Answer 1

文本框原型本身具有controls属性。您还需要将新的deleteControl属性添加到Textbox.prototype.controls中，其内容如下

fabric.Textbox.prototype.controls.deleteControl = new fabric.Control({
// ...
})