bar.js
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import { on, off } from 'element-ui/src/utils/dom';
import { renderThumbStyle, BAR_MAP } from './util';
/* istanbul ignore next */
export default {
name: 'Bar',
props: {
vertical: Boolean,
size: String,
move: Number
},
computed: {
bar() {
return BAR_MAP[this.vertical ? 'vertical' : 'horizontal'];
},
wrap() {
return this.$parent.wrap;
}
},
render(h) {
const { size, move, bar } = this;
return (
<div
class={ ['el-scrollbar__bar', 'is-' + bar.key] }
onMousedown={ this.clickTrackHandler } >
<div
ref="thumb"
class="el-scrollbar__thumb"
onMousedown={ this.clickThumbHandler }
style={ renderThumbStyle({ size, move, bar }) }>
</div>
</div>
);
},
methods: {
clickThumbHandler(e) {
// prevent click event of right button
if (e.ctrlKey || e.button === 2) {
return;
}
this.startDrag(e);
this[this.bar.axis] = (e.currentTarget[this.bar.offset] - (e[this.bar.client] - e.currentTarget.getBoundingClientRect()[this.bar.direction]));
},
clickTrackHandler(e) {
const offset = Math.abs(e.target.getBoundingClientRect()[this.bar.direction] - e[this.bar.client]);
const thumbHalf = (this.$refs.thumb[this.bar.offset] / 2);
const thumbPositionPercentage = ((offset - thumbHalf) * 100 / this.$el[this.bar.offset]);
this.wrap[this.bar.scroll] = (thumbPositionPercentage * this.wrap[this.bar.scrollSize] / 100);
},
startDrag(e) {
e.stopImmediatePropagation();
this.cursorDown = true;
on(document, 'mousemove', this.mouseMoveDocumentHandler);
on(document, 'mouseup', this.mouseUpDocumentHandler);
document.onselectstart = () => false;
},
mouseMoveDocumentHandler(e) {
if (this.cursorDown === false) return;
const prevPage = this[this.bar.axis];
if (!prevPage) return;
const offset = ((this.$el.getBoundingClientRect()[this.bar.direction] - e[this.bar.client]) * -1);
const thumbClickPosition = (this.$refs.thumb[this.bar.offset] - prevPage);
const thumbPositionPercentage = ((offset - thumbClickPosition) * 100 / this.$el[this.bar.offset]);
this.wrap[this.bar.scroll] = (thumbPositionPercentage * this.wrap[this.bar.scrollSize] / 100);
},
mouseUpDocumentHandler(e) {
this.cursorDown = false;
this[this.bar.axis] = 0;
off(document, 'mousemove', this.mouseMoveDocumentHandler);
document.onselectstart = null;
}
},
destroyed() {
off(document, 'mouseup', this.mouseUpDocumentHandler);
}
};