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<script>
import _ from 'underscore';
import { pixeliseValue } from '../../../lib/utils/dom_utils';
import ImageViewer from '../../../content_viewer/viewers/image_viewer.vue';
export default {
components: {
ImageViewer,
},
props: {
newPath: {
type: String,
required: true,
},
oldPath: {
type: String,
required: true,
},
},
data() {
return {
dragging: false,
swipeOldImgInfo: null,
swipeNewImgInfo: null,
swipeMaxWidth: undefined,
swipeMaxHeight: undefined,
swipeBarPos: 1,
swipeWrapWidth: 0,
};
},
computed: {
swipeMaxPixelWidth() {
return pixeliseValue(this.swipeMaxWidth);
},
swipeMaxPixelHeight() {
return pixeliseValue(this.swipeMaxHeight);
},
swipeWrapPixelWidth() {
return pixeliseValue(this.swipeWrapWidth);
},
swipeBarPixelPos() {
return pixeliseValue(this.swipeBarPos);
},
},
beforeDestroy() {
window.removeEventListener('resize', this.resizeThrottled, false);
document.body.removeEventListener('mouseup', this.stopDrag);
document.body.removeEventListener('mousemove', this.dragMove);
},
mounted() {
window.addEventListener('resize', this.resize, false);
},
methods: {
dragMove(e) {
if (!this.dragging) return;
let leftValue = e.pageX - this.$refs.swipeFrame.getBoundingClientRect().left;
const spaceLeft = 20;
const { clientWidth } = this.$refs.swipeFrame;
if (leftValue <= 0) {
leftValue = 0;
} else if (leftValue > clientWidth - spaceLeft) {
leftValue = clientWidth - spaceLeft;
}
this.swipeWrapWidth = (leftValue / clientWidth) * 100;
this.swipeBarPos = leftValue;
},
startDrag() {
this.dragging = true;
document.body.addEventListener('mousemove', this.dragMove);
},
stopDrag() {
this.dragging = false;
document.body.removeEventListener('mousemove', this.dragMove);
},
prepareSwipe() {
if (this.swipeOldImgInfo && this.swipeNewImgInfo) {
// Add 2 for border width
this.swipeMaxWidth =
Math.max(this.swipeOldImgInfo.renderedWidth, this.swipeNewImgInfo.renderedWidth) + 2;
this.swipeMaxHeight =
Math.max(this.swipeOldImgInfo.renderedHeight, this.swipeNewImgInfo.renderedHeight) + 2;
document.body.addEventListener('mouseup', this.stopDrag);
}
},
swipeNewImgLoaded(imgInfo) {
this.swipeNewImgInfo = imgInfo;
this.prepareSwipe();
},
swipeOldImgLoaded(imgInfo) {
this.swipeOldImgInfo = imgInfo;
this.prepareSwipe();
},
resize: _.throttle(function throttledResize() {
this.swipeBarPos = 0;
}, 400),
},
};
</script>
<template>
<div class="swipe view">
<div
ref="swipeFrame"
:style="{
'user-select': dragging ? 'none' : null,
}"
class="swipe-frame"
>
<image-viewer
key="swipeOldImg"
ref="swipeOldImg"
:render-info="false"
:path="oldPath"
class="frame deleted"
@imgLoaded="swipeOldImgLoaded"
/>
<div
ref="swipeWrap"
:style="{
width: `${swipeWrapWidth}%`,
}"
class="swipe-wrap"
>
<image-viewer
key="swipeNewImg"
:render-info="false"
:path="newPath"
:style="{
width: swipeMaxPixelWidth,
}"
class="frame added"
@imgLoaded="swipeNewImgLoaded"
>
<slot slot="image-overlay" name="image-overlay"> </slot>
</image-viewer>
</div>
<span
ref="swipeBar"
:style="{ left: swipeBarPixelPos }"
class="swipe-bar"
@mousedown="startDrag"
@mouseup="stopDrag"
>
<span class="top-handle"></span> <span class="bottom-handle"></span>
</span>
</div>
</div>
</template>
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