main.js
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// reference https://github.com/noeldelgado/gemini-scrollbar/blob/master/index.js
import { addResizeListener, removeResizeListener } from 'element-ui/src/utils/resize-event';
import scrollbarWidth from 'element-ui/src/utils/scrollbar-width';
import { toObject } from 'element-ui/src/utils/util';
import Bar from './bar';
/* istanbul ignore next */
export default {
name: 'ElScrollbar',
components: { Bar },
props: {
native: Boolean,
wrapStyle: {},
wrapClass: {},
viewClass: {},
viewStyle: {},
noresize: Boolean, // 如果 container 尺寸不会发生变化，最好设置它可以优化性能
tag: {
type: String,
default: 'div'
}
},
data() {
return {
sizeWidth: '0',
sizeHeight: '0',
moveX: 0,
moveY: 0
};
},
computed: {
wrap() {
return this.$refs.wrap;
}
},
render(h) {
let gutter = scrollbarWidth();
let style = this.wrapStyle;
if (gutter) {
const gutterWith = `-${gutter}px`;
const gutterStyle = `margin-bottom: ${gutterWith}; margin-right: ${gutterWith};`;
if (Array.isArray(this.wrapStyle)) {
style = toObject(this.wrapStyle);
style.marginRight = style.marginBottom = gutterWith;
} else if (typeof this.wrapStyle === 'string') {
style += gutterStyle;
} else {
style = gutterStyle;
}
}
const view = h(this.tag, {
class: ['el-scrollbar__view', this.viewClass],
style: this.viewStyle,
ref: 'resize'
}, this.$slots.default);
const wrap = (
<div
ref="wrap"
style={ style }
onScroll={ this.handleScroll }
class={ [this.wrapClass, 'el-scrollbar__wrap', gutter ? '' : 'el-scrollbar__wrap--hidden-default'] }>
{ [view] }
</div>
);
let nodes;
if (!this.native) {
nodes = ([
wrap,
<Bar
move={ this.moveX }
size={ this.sizeWidth }></Bar>,
<Bar
vertical
move={ this.moveY }
size={ this.sizeHeight }></Bar>
]);
} else {
nodes = ([
<div
ref="wrap"
class={ [this.wrapClass, 'el-scrollbar__wrap'] }
style={ style }>
{ [view] }
</div>
]);
}
return h('div', { class: 'el-scrollbar' }, nodes);
},
methods: {
handleScroll() {
const wrap = this.wrap;
this.moveY = ((wrap.scrollTop * 100) / wrap.clientHeight);
this.moveX = ((wrap.scrollLeft * 100) / wrap.clientWidth);
},
update() {
let heightPercentage, widthPercentage;
const wrap = this.wrap;
if (!wrap) return;
heightPercentage = (wrap.clientHeight * 100 / wrap.scrollHeight);
widthPercentage = (wrap.clientWidth * 100 / wrap.scrollWidth);
this.sizeHeight = (heightPercentage < 100) ? (heightPercentage + '%') : '';
this.sizeWidth = (widthPercentage < 100) ? (widthPercentage + '%') : '';
}
},
mounted() {
if (this.native) return;
this.$nextTick(this.update);
!this.noresize && addResizeListener(this.$refs.resize, this.update);
},
beforeDestroy() {
if (this.native) return;
!this.noresize && removeResizeListener(this.$refs.resize, this.update);
}
};