接到个需求希望不需要点击图片可以直接进行放大、旋转等操作,
el-image 有个组件是image-viewer 基于改组件进行了部分修改
image-viewer组件滚动放大是基于document绑定的事件,这样会导致右侧内容过长出现滚动条的时候,用鼠标滚轮滚动右侧内容,左侧图片会跟着相应的放大缩小,导致用户体验不佳,做了如下修改:
将鼠标滚动事件基于document改为基于el-image-viewer__wrapper
image-viewer .el-image-viewer__wrapper样式设置了position:fixed固定定位,导致拖动图片的时候容器区域会占据右侧的区域,做了如下修改:
将 .el-image-viewer__wrapper的固定定位改为绝对定位,把.el-image-viewer__img基于.el-image-viewer__canvas这个盒子进行绝对定位
完整代码如下:
<template>
<transition name="viewer-fade">
<div tabindex="-1" ref="el-image-viewer__wrapper" class="el-image-viewer__wrapper" :style="{ 'z-index': viewerZIndex }">
<div class="el-image-viewer__mask" @click.self="handleMaskClick"></div>
<!-- CLOSE -->
<span class="el-image-viewer__btn el-image-viewer__close" @click="hide">
<i class="el-icon-close"></i>
</span>
<!-- ARROW -->
<template v-if="!isSingle">
<span
class="el-image-viewer__btn el-image-viewer__prev"
:class="{ 'is-disabled': !infinite && isFirst }"
@click="prev">
<i class="el-icon-arrow-left"/>
</span>
<span
class="el-image-viewer__btn el-image-viewer__next"
:class="{ 'is-disabled': !infinite && isLast }"
@click="next">
<i class="el-icon-arrow-right"/>
</span>
</template>
<!-- ACTIONS -->
<div class="el-image-viewer__btn el-image-viewer__actions">
<div class="el-image-viewer__actions__inner">
<i class="el-icon-zoom-out" @click="handleActions('zoomOut')"></i>
<i class="el-icon-zoom-in" @click="handleActions('zoomIn')"></i>
<i class="el-image-viewer__actions__divider"></i>
<i :class="mode.icon" @click="toggleMode"></i>
<i class="el-image-viewer__actions__divider"></i>
<i class="el-icon-refresh-left" @click="handleActions('anticlocelise')"></i>
<i class="el-icon-refresh-right" @click="handleActions('clocelise')"></i>
</div>
</div>
<!-- CANVAS -->
<div class="el-image-viewer__canvas">
<img
v-for="(url, i) in urlList"
v-if="i === index"
ref="img"
class="el-image-viewer__img"
:key="url"
:src="currentImg"
:style="imgStyle"
@load="handleImgLoad"
@error="handleImgError"
@mousedown="handleMouseDown">
</div>
</div>
</transition>
</template>
<script>
import { on, off } from 'element-ui/src/utils/dom';
import { rafThrottle, isFirefox } from 'element-ui/src/utils/util';
import { PopupManager } from 'element-ui/src/utils/popup';
const Mode = {
CONTAIN: {
name: 'contain',
icon: 'el-icon-full-screen'
},
ORIGINAL: {
name: 'original',
icon: 'el-icon-c-scale-to-original'
}
};
const mousewheelEventName = isFirefox() ? 'DOMMouseScroll' : 'mousewheel';
export default {
name: 'elImageViewer',
props: {
urlList: {
type: Array,
default: () => []
},
zIndex: {
type: Number,
default: 2000
},
onSwitch: {
type: Function,
default: () => {}
},
onClose: {
type: Function,
default: () => {}
},
initialIndex: {
type: Number,
default: 0
},
appendToBody: {
type: Boolean,
default: true
},
maskClosable: {
type: Boolean,
default: true
}
},
data() {
return {
index: this.initialIndex,
isShow: false,
infinite: true,
loading: false,
mode: Mode.CONTAIN,
transform: {
scale: 1,
deg: 0,
offsetX: 0,
offsetY: 0,
enableTransition: false
}
};
},
computed: {
isSingle() {
return this.urlList.length <= 1;
},
isFirst() {
return this.index === 0;
},
isLast() {
return this.index === this.urlList.length - 1;
},
currentImg() {
return this.urlList[this.index];
},
imgStyle() {
const { scale, deg, offsetX, offsetY, enableTransition } = this.transform;
const style = {
transform: `scale(${scale}) rotate(${deg}deg)`,
transition: enableTransition ? 'transform .3s' : '',
'margin-left': `${offsetX}px`,
'margin-top': `${offsetY}px`
};
if (this.mode === Mode.CONTAIN) {
style.maxWidth = style.maxHeight = '100%';
}
return style;
},
viewerZIndex() {
const nextZIndex = PopupManager.nextZIndex();
return this.zIndex > nextZIndex ? this.zIndex : nextZIndex;
}
},
watch: {
index: {
handler: function(val) {
this.reset();
this.onSwitch(val);
}
},
currentImg(val) {
this.$nextTick(_ => {
const $img = this.$refs.img[0];
if (!$img.complete) {
this.loading = true;
}
});
}
},
methods: {
hide() {
this.deviceSupportUninstall();
this.onClose();
},
deviceSupportInstall() {
this._keyDownHandler = e => {
e.stopPropagation();
const keyCode = e.keyCode;
switch (keyCode) {
// ESC
case 27:
this.hide();
break;
// SPACE
case 32:
this.toggleMode();
break;
// LEFT_ARROW
case 37:
this.prev();
break;
// UP_ARROW
case 38:
this.handleActions('zoomIn');
break;
// RIGHT_ARROW
case 39:
this.next();
break;
// DOWN_ARROW
case 40:
this.handleActions('zoomOut');
break;
}
};
this._mouseWheelHandler = rafThrottle(e => {
const delta = e.wheelDelta ? e.wheelDelta : -e.detail;
if (delta > 0) {
this.handleActions('zoomIn', {
zoomRate: 0.015,
enableTransition: false
});
} else {
this.handleActions('zoomOut', {
zoomRate: 0.015,
enableTransition: false
});
}
});
on(document, 'keydown', this._keyDownHandler);
// on(document, mousewheelEventName, this._mouseWheelHandler);
// 将鼠标滚动事件基于document改为基于el-image-viewer__wrapper
if (this.$refs['el-image-viewer__wrapper']) {
on(this.$refs['el-image-viewer__wrapper'], mousewheelEventName, this._mouseWheelHandler);
}
},
deviceSupportUninstall() {
off(document, 'keydown', this._keyDownHandler);
off(document, mousewheelEventName, this._mouseWheelHandler);
this._keyDownHandler = null;
this._mouseWheelHandler = null;
},
handleImgLoad(e) {
this.loading = false;
},
handleImgError(e) {
this.loading = false;
e.target.alt = '加载失败';
},
handleMouseDown(e) {
if (this.loading || e.button !== 0) return;
const { offsetX, offsetY } = this.transform;
const startX = e.pageX;
const startY = e.pageY;
this._dragHandler = rafThrottle(ev => {
this.transform.offsetX = offsetX + ev.pageX - startX;
this.transform.offsetY = offsetY + ev.pageY - startY;
});
on(document, 'mousemove', this._dragHandler);
on(document, 'mouseup', ev => {
off(document, 'mousemove', this._dragHandler);
});
e.preventDefault();
},
handleMaskClick() {
if (this.maskClosable) {
this.hide();
}
},
reset() {
this.transform = {
scale: 1,
deg: 0,
offsetX: 0,
offsetY: 0,
enableTransition: false
};
},
toggleMode() {
if (this.loading) return;
const modeNames = Object.keys(Mode);
const modeValues = Object.values(Mode);
const index = modeValues.indexOf(this.mode);
const nextIndex = (index + 1) % modeNames.length;
this.mode = Mode[modeNames[nextIndex]];
this.reset();
},
prev() {
if (this.isFirst && !this.infinite) return;
const len = this.urlList.length;
this.index = (this.index - 1 + len) % len;
},
next() {
if (this.isLast && !this.infinite) return;
const len = this.urlList.length;
this.index = (this.index + 1) % len;
},
handleActions(action, options = {}) {
if (this.loading) return;
const { zoomRate, rotateDeg, enableTransition } = {
zoomRate: 0.2,
rotateDeg: 90,
enableTransition: true,
...options
};
const { transform } = this;
switch (action) {
case 'zoomOut':
if (transform.scale > 0.2) {
transform.scale = parseFloat((transform.scale - zoomRate).toFixed(3));
}
break;
case 'zoomIn':
transform.scale = parseFloat((transform.scale + zoomRate).toFixed(3));
break;
case 'clocelise':
transform.deg += rotateDeg;
break;
case 'anticlocelise':
transform.deg -= rotateDeg;
break;
}
transform.enableTransition = enableTransition;
}
},
mounted() {
this.deviceSupportInstall();
if (this.appendToBody) {
document.body.appendChild(this.$el);
}
// add tabindex then wrapper can be focusable via Javascript
// focus wrapper so arrow key can't cause inner scroll behavior underneath
this.$refs['el-image-viewer__wrapper'].focus();
},
destroyed() {
// if appendToBody is true, remove DOM node after destroy
if (this.appendToBody && this.$el && this.$el.parentNode) {
this.$el.parentNode.removeChild(this.$el);
}
}
};
</script>
<style scoped>
.el-image-viewer__wrapper{
position: absolute;
}
.el-image-viewer__mask{
background: inherit;
}
.el-image-viewer__close{
display: none;
}
.el-image-viewer__actions{
height: 30px;
width: 200px;
}
.el-image-viewer__actions__inner{
font-size: 18px;
}
.el-image-viewer__canvas{
overflow: hidden;
position: relative;
}
.el-image-viewer__img{
position: absolute;
}
</style>
vue文件中进行引用:
appendToBody:true表示将该组件放置于body层(body就是他的父),false表示放置在正常盒子里(imgCont-div是他的父)
<div class="imgCont" ref="imgCont">
<ElImageViewer
:appendToBody="false"
ref="elImageViewer"
:url-list="[imgUrl]"
></ElImageViewer>
</div>
appendToBody:true 代码效果图:
appendToBody:false 代码效果图:
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