<template xlang="wxml" minapp="mpvue">
	<view class="tki-barcode">
		<!-- #ifndef MP-ALIPAY -->
		<canvas class="tki-barcode-canvas" :canvas-id="cid"
			:style="{width:canvasWidth+'px',height:canvasHeight+'px'}" />
		<!-- #endif -->
		<!-- #ifdef MP-ALIPAY -->
		<canvas :id="cid" :width="canvasWidth" :height="canvasHeight" class="tki-barcode-canvas" />
		<!-- #endif -->
		<image v-show="show" :src="result" :style="{width:canvasWidth+'px',height:canvasHeight+'px'}" />
	</view>
</template>

<script>
	// const barcode = require('./barcode.js');
	import barCode from "./barcode.js"
	const opations = {
		// format: "CODE128",//选择要使用的条形码类型 微信支持的条码类型有 code128\code39\ena13\ean8\upc\itf14\
		width: 4, //设置条之间的宽度
		height: 120, //高度
		displayValue: true, //是否在条形码下方显示文字
		// text: "1234567890",//覆盖显示的文本
		textAlign: "center", //设置文本的水平对齐方式
		textPosition: "bottom", //设置文本的垂直位置
		textMargin: 0, //设置条形码和文本之间的间距
		fontSize: 24, //设置文本的大小
		fontColor: "#000000", //设置文本的颜色
		lineColor: "#000000", //设置条形码的颜色
		background: "#FFFFFF", //设置条形码的背景色
		margin: 0, //设置条形码周围的空白边距
		marginTop: undefined, //设置条形码周围的上边距
		marginBottom: undefined, //设置条形码周围的下边距
		marginLeft: undefined, //设置条形码周围的左边距
		marginRight: undefined, //设置条形码周围的右边距
	}
	export default {
		name: "tkiBarcode",
		props: {
			show: {
				type: Boolean,
				default: true
			},
			cid: {
				type: String,
				default: 'tki-barcode-canvas'
			},
			unit: {
				type: String,
				default: 'upx'
			},
			val: {
				type: String,
				default: ''
			},
			format: {
				type: String,
				default: 'CODE128'
			},
			opations: {
				type: Object,
				default: function() {
					return {}
				}
			},
			onval: {
				type: Boolean,
				default: false
			},
			loadMake: {
				type: Boolean,
				default: true
			},
		},
		data() {
			return {
				result: '',
				canvasWidth: 0,
				canvasHeight: 0,
				defaultOpations: Object.assign({}, opations)
			}
		},
		onUnload: function() {},
		methods: {
			_makeCode() {
				let that = this
				// 合并参数
				Object.assign(this.defaultOpations, this.opations)
				if (that.unit == "upx") {
					if (that.defaultOpations.width) {
						that.defaultOpations.width = uni.upx2px(that.defaultOpations.width)
					}
					if (that.defaultOpations.height) {
						that.defaultOpations.height = uni.upx2px(that.defaultOpations.height)
					}
					if (that.defaultOpations.fontSize) {
						that.defaultOpations.fontSize = uni.upx2px(that.defaultOpations.fontSize)
					}
				}
				if (that._empty(that.defaultOpations.text)) {
					that.defaultOpations.text = that.val
				}
				if (that._empty(that.defaultOpations.format)) {
					that.defaultOpations.format = that.format
				}
				// console.log(JSON.stringify(that.defaultOpations))
				new barCode(that, that.cid, that.defaultOpations,
					function(res) { // 生成条形码款高回调
						that.canvasWidth = res.width
						that.canvasHeight = res.height
					},
					function(res) { // 生成条形码的回调
						// 返回值
						that._result(res)
						// 重置默认参数
						that.defaultOpations = opations
					},
				);
			},
			_clearCode() {
				this._result('')
			},
			_saveCode() {
				let that = this;
				if (this.result != "") {
					uni.saveImageToPhotosAlbum({
						filePath: that.result,
						success: function() {
							uni.showToast({
								title: '条形码保存成功',
								icon: 'success',
								duration: 2000
							});
						}
					});
				}
			},
			_result(res) {
				this.result = res;
				this.$emit('result', res)
			},
			_empty(v) {
				let tp = typeof v,
					rt = false;
				if (tp == "number" && String(v) == "") {
					rt = true
				} else if (tp == "undefined") {
					rt = true
				} else if (tp == "object") {
					if (JSON.stringify(v) == "{}" || JSON.stringify(v) == "[]" || v == null) rt = true
				} else if (tp == "string") {
					if (v == "" || v == "undefined" || v == "null" || v == "{}" || v == "[]") rt = true
				} else if (tp == "function") {
					rt = false
				}
				return rt
			}
		},
		watch: {
			val(n, o) {
				if (this.onval) {
					if (n != o && !this._empty(n)) {
						setTimeout(() => {
							this._makeCode()
						}, 0);
					}
				}
			},
			opations: {
				handler(n, o) {
					if (this.onval) {
						if (!this._empty(n)) {
							setTimeout(() => {
								this._makeCode()
							}, 0);
						}
					}
				},
				deep: true
			}
		},
		mounted: function() {
			if (this.loadMake) {
				if (!this._empty(this.val)) {
					setTimeout(() => {
						this._makeCode()
					}, 0);
				}
			}
		},
	}
</script>
<style>
	.tki-barcode {
		text-align: right;
		position: relative;
	}

	.tki-barcode-canvas {
		position: fixed;
		top: -99999upx;
		left: -99999upx;
		z-index: -99999;
	}
</style>
