141 lines
3.2 KiB
Vue
141 lines
3.2 KiB
Vue
import PropTypes from '../_util/vue-types';
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import BaseMixin from '../_util/BaseMixin';
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import classnames from 'classnames';
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import raf from 'raf';
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function noop() {}
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const scrollTo = (element, to, duration) => {
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// jump to target if duration zero
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if (duration <= 0) {
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raf(() => {
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element.scrollTop = to;
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});
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return;
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}
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const difference = to - element.scrollTop;
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const perTick = (difference / duration) * 10;
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raf(() => {
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element.scrollTop += perTick;
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if (element.scrollTop === to) return;
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scrollTo(element, to, duration - 10);
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});
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};
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const Select = {
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mixins: [BaseMixin],
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props: {
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prefixCls: PropTypes.string,
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options: PropTypes.array,
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selectedIndex: PropTypes.number,
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type: PropTypes.string,
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// onSelect: PropTypes.func,
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// onMouseEnter: PropTypes.func,
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},
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data() {
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return {
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active: false,
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};
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},
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mounted() {
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this.$nextTick(() => {
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// jump to selected option
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this.scrollToSelected(0);
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});
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},
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watch: {
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selectedIndex() {
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this.$nextTick(() => {
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// smooth scroll to selected option
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this.scrollToSelected(120);
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});
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},
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},
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methods: {
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onSelect(value) {
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const { type } = this;
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this.__emit('select', type, value);
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},
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onEsc(e) {
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this.__emit('esc', e);
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},
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getOptions() {
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const { options, selectedIndex, prefixCls } = this;
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return options.map((item, index) => {
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const cls = classnames({
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[`${prefixCls}-select-option-selected`]: selectedIndex === index,
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[`${prefixCls}-select-option-disabled`]: item.disabled,
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});
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const onClick = item.disabled
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? noop
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: () => {
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this.onSelect(item.value);
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};
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const onKeyDown = e => {
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if (e.keyCode === 13) onClick();
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else if (e.keyCode === 27) this.onEsc();
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};
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return (
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<li
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role="button"
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onClick={onClick}
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class={cls}
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key={index}
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disabled={item.disabled}
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tabIndex="0"
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onKeydown={onKeyDown}
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>
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{item.value}
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</li>
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);
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});
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},
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handleMouseEnter(e) {
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this.setState({ active: true });
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this.__emit('mouseenter', e);
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},
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handleMouseLeave() {
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this.setState({ active: false });
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},
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scrollToSelected(duration) {
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// move to selected item
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const select = this.$el;
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const list = this.$refs.list;
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if (!list) {
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return;
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}
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let index = this.selectedIndex;
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if (index < 0) {
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index = 0;
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}
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const topOption = list.children[index];
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const to = topOption.offsetTop;
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scrollTo(select, to, duration);
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},
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},
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render() {
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const { prefixCls, options, active } = this;
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if (options.length === 0) {
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return null;
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}
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const cls = {
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[`${prefixCls}-select`]: 1,
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[`${prefixCls}-select-active`]: active,
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};
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return (
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<div class={cls} onMouseenter={this.handleMouseEnter} onMouseleave={this.handleMouseLeave}>
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<ul ref="list">{this.getOptions()}</ul>
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</div>
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);
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},
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};
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export default Select;
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