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