mechanicStore-app/uni_modules/uview-plus/libs/util/gcanvas/env/image.js

let incId = 1;

import GBridge from '../bridge/bridge-weex.js'
const noop = function () { };

class GImage {

    static GBridge = null;

    constructor() {
        this._id = incId++;
        this._width = 0;
        this._height = 0;
        this._src = undefined;
        this._onload = noop;
        this._onerror = noop;
        this.complete = false;
    }

    get width() {
        return this._width;
    }
    set width(v) {
        this._width = v;
    }

    get height() {
        return this._height;
    }

    set height(v) {
        this._height = v;
    }

    get src() {
        return this._src;
    }

    set src(v) {

        if (v.startsWith('//')) {
            v = 'http:' + v;
        }

        this._src = v;
		try {
			GBridge.perloadImage([this._src, this._id], (data) => {
				if (process.env.NODE_ENV === 'development') {
					console.log('****GBridge.perloadImage****')
				}
				if (typeof data === 'string') {
					data = JSON.parse(data);
				}
				
				if (data.error) {
					var evt = { type: 'error', target: this };
					this.onerror(evt);
				} else {
					this.complete = true;
					this.width = typeof data.width === 'number' ? data.width : 0;
					this.height = typeof data.height === 'number' ? data.height : 0;
					var evt = { type: 'load', target: this };
					this.onload(evt);
				}
			});
		} catch (error) {
			console.log('perloadImage fail', error)
		}
    }

    addEventListener(name, listener) {
        if (name === 'load') {
            this.onload = listener;
        } else if (name === 'error') {
            this.onerror = listener;
        }
    }

    removeEventListener(name, listener) {
        if (name === 'load') {
            this.onload = noop;
        } else if (name === 'error') {
            this.onerror = noop;
        }
    }

    get onload() {
        return this._onload;
    }

    set onload(v) {
        this._onload = v;
    }

    get onerror() {
        return this._onerror;
    }

    set onerror(v) {
        this._onerror = v;
    }
}

export default GImage;