我在fabricjs画布上的事件有两天了。我猜这是关于fabricjs的。我发现了问题,但是我不明白为什么这是一个问题。
我有一个鼠标事件和两个调用函数clip1和clip2的按钮(单击事件)。
clip1和clip2之间的区别:clip1使用this.canvas和clip2创建一个新的canvas。似乎button1 click事件会将其自身注册到画布的所有事件。像个虫子,对吗?
.HTML
<canvas id="c" width="800" height="800" style="border:1px solid #000"></canvas>
<img src="../../clips/kupurFirst.jpg" id="my-image1" hidden>
<button (click)="clip1()">Clip1 </button>
<button (click)="clip2()">Clip2</button>
.TS
import { Component, OnInit } from '@angular/core';
@Component({
moduleId: module.id,
selector: 'app-fabric',
templateUrl: 'fabric.component.html',
styleUrls: ['fabric.component.css']
})
export class FabricComponent implements OnInit {
public canvas: any;
public src: string;
constructor() { }
ngOnInit() {
this.canvas = new fabric.Canvas('c');
this.src = "../../clips/kupurSecond.jpg";
loadCanvas(this.src, this.canvas);
// Works normally until click event (clip1) fires
this.canvas.on('mouse:down', function (event) {
console.log("Down");
});
}
// Problem with this.canvas
public clip1() {
loadCanvas(this.src, this.canvas);
this.canvas.clipTo = function (ctx) {
console.log("clip1");
};
}
// No problem with new canvas element
public clip2() {
var canvas = new fabric.Canvas('c');
loadCanvas(this.src, canvas);
canvas.clipTo = (ctx) => {
console.log("clip2");
};
}
}
var loadCanvas = (src: string, canvas: any) => {
fabric.Image.fromURL(src, (oImg) => {
canvas.add(oImg);
}, { hasControls: false, selectable: false, evented: false, strokeDashArray: [2, 2], opacity: 1 });
}
我找到了解决方案。看起来并不完美,但对我有用:
this.canvas.clipTo = null; // Prevents fire of clipTo function at every event.
我将此行放入新按钮(函数)中,并将其命名为“撤消”。
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我来说两句