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feat(Rate): optimize touchmove gesture (#4336)
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import { createNamespace, addUnit } from '../utils'; | ||
import { preventDefault } from '../utils/dom/event'; | ||
import { TouchMixin } from '../mixins/touch'; | ||
import Icon from '../icon'; | ||
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const [createComponent, bem] = createNamespace('rate'); | ||
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function getRateStatus(value, index, allowHalf) { | ||
if (value >= index) { | ||
return 'full'; | ||
} | ||
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if (value + 0.5 >= index && allowHalf) { | ||
return 'half'; | ||
} | ||
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return 'void'; | ||
} | ||
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export default createComponent({ | ||
mixins: [TouchMixin], | ||
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props: { | ||
size: [Number, String], | ||
gutter: [Number, String], | ||
readonly: Boolean, | ||
disabled: Boolean, | ||
allowHalf: Boolean, | ||
value: { | ||
type: Number, | ||
default: 0 | ||
}, | ||
icon: { | ||
type: String, | ||
default: 'star' | ||
}, | ||
voidIcon: { | ||
type: String, | ||
default: 'star-o' | ||
}, | ||
color: { | ||
type: String, | ||
default: '#ffd21e' | ||
}, | ||
voidColor: { | ||
type: String, | ||
default: '#c7c7c7' | ||
}, | ||
disabledColor: { | ||
type: String, | ||
default: '#bdbdbd' | ||
}, | ||
count: { | ||
type: Number, | ||
default: 5 | ||
} | ||
}, | ||
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computed: { | ||
list() { | ||
const list = []; | ||
for (let i = 1; i <= this.count; i++) { | ||
list.push(getRateStatus(this.value, i, this.allowHalf)); | ||
} | ||
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return list; | ||
}, | ||
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sizeWithUnit() { | ||
return addUnit(this.size); | ||
}, | ||
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gutterWithUnit() { | ||
return addUnit(this.gutter); | ||
} | ||
}, | ||
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methods: { | ||
select(index) { | ||
if (!this.disabled && !this.readonly && index !== this.value) { | ||
this.$emit('input', index); | ||
this.$emit('change', index); | ||
} | ||
}, | ||
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onTouchStart(event) { | ||
if (this.readonly || this.disabled) { | ||
return; | ||
} | ||
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this.touchStart(event); | ||
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const rects = this.$refs.items.map(item => item.getBoundingClientRect()); | ||
const ranges = []; | ||
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rects.forEach((rect, index) => { | ||
if (this.allowHalf) { | ||
ranges.push( | ||
{ score: index + 0.5, left: rect.left }, | ||
{ score: index + 1, left: rect.left + rect.width / 2 } | ||
); | ||
} else { | ||
ranges.push({ score: index + 1, left: rect.left }); | ||
} | ||
}); | ||
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this.ranges = ranges; | ||
}, | ||
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onTouchMove(event) { | ||
if (this.readonly || this.disabled) { | ||
return; | ||
} | ||
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this.touchMove(event); | ||
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if (this.direction === 'horizontal') { | ||
preventDefault(event); | ||
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const { clientX } = event.touches[0]; | ||
this.select(this.getScoreByPosition(clientX)); | ||
} | ||
}, | ||
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getScoreByPosition(x) { | ||
for (let i = this.ranges.length - 1; i > 0; i--) { | ||
if (x > this.ranges[i].left) { | ||
return this.ranges[i].score; | ||
} | ||
} | ||
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return this.allowHalf ? 0.5 : 1; | ||
}, | ||
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renderStar(status, index) { | ||
const { icon, color, count, voidIcon, disabled, voidColor, disabledColor } = this; | ||
const score = index + 1; | ||
const isFull = status === 'full'; | ||
const isVoid = status === 'void'; | ||
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let style; | ||
if (this.gutterWithUnit && score !== count) { | ||
style = { paddingRight: this.gutterWithUnit }; | ||
} | ||
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return ( | ||
<div | ||
ref="items" | ||
refInFor | ||
key={index} | ||
role="radio" | ||
style={style} | ||
tabindex="0" | ||
aria-setsize={count} | ||
aria-posinset={score} | ||
aria-checked={String(!isVoid)} | ||
class={bem('item')} | ||
> | ||
<Icon | ||
size={this.sizeWithUnit} | ||
name={isFull ? icon : voidIcon} | ||
class={bem('icon')} | ||
data-score={score} | ||
color={disabled ? disabledColor : isFull ? color : voidColor} | ||
onClick={() => { | ||
this.select(score); | ||
}} | ||
/> | ||
{this.allowHalf && ( | ||
<Icon | ||
size={this.sizeWithUnit} | ||
name={isVoid ? voidIcon : icon} | ||
class={bem('icon', 'half')} | ||
data-score={score - 0.5} | ||
color={disabled ? disabledColor : isVoid ? voidColor : color} | ||
onClick={() => { | ||
this.select(score - 0.5); | ||
}} | ||
/> | ||
)} | ||
</div> | ||
); | ||
} | ||
}, | ||
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render() { | ||
return ( | ||
<div | ||
class={bem()} | ||
tabindex="0" | ||
role="radiogroup" | ||
onTouchstart={this.onTouchStart} | ||
onTouchmove={this.onTouchMove} | ||
> | ||
{this.list.map((status, index) => this.renderStar(status, index))} | ||
</div> | ||
); | ||
} | ||
}); |
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