<template>
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<transition name="viewer-fade">
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<div tabindex="-1" ref="el-image-viewer__wrapper" class="el-image-viewer__wrapper" :style="{ 'z-index': viewerZIndex }">
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<div class="el-image-viewer__mask" @click.self="handleMaskClick"></div>
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<!-- CLOSE -->
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<span class="el-image-viewer__btn el-image-viewer__close" @click="hide">
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<i class="el-icon-close"></i>
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</span>
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<!-- ARROW -->
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<template v-if="!isSingle">
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<span
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class="el-image-viewer__btn el-image-viewer__prev"
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:class="{ 'is-disabled': !infinite && isFirst }"
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@click="prev">
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<i class="el-icon-arrow-left"/>
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</span>
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<span
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class="el-image-viewer__btn el-image-viewer__next"
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:class="{ 'is-disabled': !infinite && isLast }"
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@click="next">
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<i class="el-icon-arrow-right"/>
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</span>
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</template>
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<!-- ACTIONS -->
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<div class="el-image-viewer__btn el-image-viewer__actions">
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<div class="el-image-viewer__actions__inner">
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<i class="el-icon-zoom-out" @click="handleActions('zoomOut')"></i>
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<i class="el-icon-zoom-in" @click="handleActions('zoomIn')"></i>
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<i class="el-image-viewer__actions__divider"></i>
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<i :class="mode.icon" @click="toggleMode"></i>
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<i class="el-image-viewer__actions__divider"></i>
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<i class="el-icon-refresh-left" @click="handleActions('anticlocelise')"></i>
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<i class="el-icon-refresh-right" @click="handleActions('clocelise')"></i>
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</div>
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</div>
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<!-- CANVAS -->
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<div class="el-image-viewer__canvas">
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<img
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v-for="(url, i) in urlList"
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v-if="i === index"
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ref="img"
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class="el-image-viewer__img"
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:key="url"
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:src="currentImg"
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:style="imgStyle"
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@load="handleImgLoad"
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@error="handleImgError"
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@mousedown="handleMouseDown">
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</div>
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</div>
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</transition>
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</template>
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<script>
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import { on, off } from 'element-ui/src/utils/dom';
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import { rafThrottle, isFirefox } from 'element-ui/src/utils/util';
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import { PopupManager } from 'element-ui/src/utils/popup';
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const Mode = {
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CONTAIN: {
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name: 'contain',
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icon: 'el-icon-full-screen'
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},
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ORIGINAL: {
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name: 'original',
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icon: 'el-icon-c-scale-to-original'
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}
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};
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const mousewheelEventName = isFirefox() ? 'DOMMouseScroll' : 'mousewheel';
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export default {
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name: 'elImageViewer',
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props: {
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urlList: {
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type: Array,
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default: () => []
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},
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zIndex: {
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type: Number,
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default: 2000
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},
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onSwitch: {
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type: Function,
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default: () => {}
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},
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onClose: {
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type: Function,
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default: () => {}
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},
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initialIndex: {
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type: Number,
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default: 0
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},
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appendToBody: {
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type: Boolean,
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default: true
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},
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maskClosable: {
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type: Boolean,
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default: true
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}
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},
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data() {
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return {
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index: this.initialIndex,
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isShow: false,
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infinite: true,
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loading: false,
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mode: Mode.CONTAIN,
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transform: {
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scale: 1,
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deg: 0,
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offsetX: 0,
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offsetY: 0,
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enableTransition: false
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}
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};
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},
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computed: {
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isSingle() {
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return this.urlList.length <= 1;
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},
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isFirst() {
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return this.index === 0;
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},
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isLast() {
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return this.index === this.urlList.length - 1;
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},
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currentImg() {
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return this.urlList[this.index];
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},
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imgStyle() {
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const { scale, deg, offsetX, offsetY, enableTransition } = this.transform;
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const style = {
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transform: `scale(${scale}) rotate(${deg}deg)`,
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transition: enableTransition ? 'transform .3s' : '',
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'margin-left': `${offsetX}px`,
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'margin-top': `${offsetY}px`
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};
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if (this.mode === Mode.CONTAIN) {
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style.maxWidth = style.maxHeight = '100%';
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}
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return style;
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},
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viewerZIndex() {
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const nextZIndex = PopupManager.nextZIndex();
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return this.zIndex > nextZIndex ? this.zIndex : nextZIndex;
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}
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},
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watch: {
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index: {
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handler: function(val) {
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this.reset();
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this.onSwitch(val);
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}
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},
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currentImg(val) {
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this.$nextTick(_ => {
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const $img = this.$refs.img[0];
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if (!$img.complete) {
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this.loading = true;
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}
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});
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}
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},
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methods: {
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hide() {
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this.deviceSupportUninstall();
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this.onClose();
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},
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deviceSupportInstall() {
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this._keyDownHandler = e => {
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e.stopPropagation();
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const keyCode = e.keyCode;
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switch (keyCode) {
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// ESC
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case 27:
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this.hide();
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break;
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// SPACE
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case 32:
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this.toggleMode();
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break;
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// LEFT_ARROW
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case 37:
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this.prev();
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break;
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// UP_ARROW
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case 38:
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this.handleActions('zoomIn');
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break;
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// RIGHT_ARROW
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case 39:
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this.next();
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break;
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// DOWN_ARROW
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case 40:
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this.handleActions('zoomOut');
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break;
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}
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};
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this._mouseWheelHandler = rafThrottle(e => {
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const delta = e.wheelDelta ? e.wheelDelta : -e.detail;
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if (delta > 0) {
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this.handleActions('zoomIn', {
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zoomRate: 0.015,
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enableTransition: false
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});
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} else {
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this.handleActions('zoomOut', {
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zoomRate: 0.015,
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enableTransition: false
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});
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}
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});
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on(document, 'keydown', this._keyDownHandler);
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on(document, mousewheelEventName, this._mouseWheelHandler);
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},
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deviceSupportUninstall() {
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off(document, 'keydown', this._keyDownHandler);
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off(document, mousewheelEventName, this._mouseWheelHandler);
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this._keyDownHandler = null;
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this._mouseWheelHandler = null;
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},
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handleImgLoad(e) {
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this.loading = false;
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},
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handleImgError(e) {
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this.loading = false;
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e.target.alt = '加载失败';
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},
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handleMouseDown(e) {
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if (this.loading || e.button !== 0) return;
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const { offsetX, offsetY } = this.transform;
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const startX = e.pageX;
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const startY = e.pageY;
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this._dragHandler = rafThrottle(ev => {
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this.transform.offsetX = offsetX + ev.pageX - startX;
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this.transform.offsetY = offsetY + ev.pageY - startY;
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});
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on(document, 'mousemove', this._dragHandler);
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on(document, 'mouseup', ev => {
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off(document, 'mousemove', this._dragHandler);
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});
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e.preventDefault();
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},
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handleMaskClick() {
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if (this.maskClosable) {
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this.hide();
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}
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},
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reset() {
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this.transform = {
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scale: 1,
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deg: 0,
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offsetX: 0,
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offsetY: 0,
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enableTransition: false
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};
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},
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toggleMode() {
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if (this.loading) return;
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const modeNames = Object.keys(Mode);
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const modeValues = Object.values(Mode);
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const index = modeValues.indexOf(this.mode);
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const nextIndex = (index + 1) % modeNames.length;
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this.mode = Mode[modeNames[nextIndex]];
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this.reset();
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},
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prev() {
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if (this.isFirst && !this.infinite) return;
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const len = this.urlList.length;
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this.index = (this.index - 1 + len) % len;
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},
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next() {
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if (this.isLast && !this.infinite) return;
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const len = this.urlList.length;
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this.index = (this.index + 1) % len;
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},
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handleActions(action, options = {}) {
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if (this.loading) return;
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const { zoomRate, rotateDeg, enableTransition } = {
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zoomRate: 0.2,
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rotateDeg: 90,
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enableTransition: true,
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...options
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};
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const { transform } = this;
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switch (action) {
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case 'zoomOut':
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if (transform.scale > 0.2) {
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transform.scale = parseFloat((transform.scale - zoomRate).toFixed(3));
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}
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break;
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case 'zoomIn':
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transform.scale = parseFloat((transform.scale + zoomRate).toFixed(3));
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break;
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case 'clocelise':
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transform.deg += rotateDeg;
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break;
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case 'anticlocelise':
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transform.deg -= rotateDeg;
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break;
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}
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transform.enableTransition = enableTransition;
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}
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},
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mounted() {
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this.deviceSupportInstall();
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if (this.appendToBody) {
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document.body.appendChild(this.$el);
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}
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// add tabindex then wrapper can be focusable via Javascript
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// focus wrapper so arrow key can't cause inner scroll behavior underneath
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this.$refs['el-image-viewer__wrapper'].focus();
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},
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destroyed() {
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// if appendToBody is true, remove DOM node after destroy
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if (this.appendToBody && this.$el && this.$el.parentNode) {
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this.$el.parentNode.removeChild(this.$el);
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}
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}
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};
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</script>
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