index.js
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import { VantComponent } from '../common/component';
import { touch } from '../mixins/touch';
import { addUnit } from '../common/utils';
VantComponent({
mixins: [touch],
props: {
disabled: Boolean,
useButtonSlot: Boolean,
activeColor: String,
inactiveColor: String,
max: {
type: Number,
value: 100
},
min: {
type: Number,
value: 0
},
step: {
type: Number,
value: 1
},
value: {
type: Number,
value: 0
},
barHeight: {
type: null,
value: '2px'
}
},
watch: {
value(value) {
this.updateValue(value, false);
}
},
created() {
this.updateValue(this.data.value);
},
methods: {
onTouchStart(event) {
if (this.data.disabled)
return;
this.touchStart(event);
this.startValue = this.format(this.data.value);
this.dragStatus = 'start';
},
onTouchMove(event) {
if (this.data.disabled)
return;
if (this.dragStatus === 'start') {
this.$emit('drag-start');
}
this.touchMove(event);
this.dragStatus = 'draging';
this.getRect('.van-slider').then((rect) => {
const diff = this.deltaX / rect.width * 100;
this.newValue = this.startValue + diff;
this.updateValue(this.newValue, false, true);
});
},
onTouchEnd() {
if (this.data.disabled)
return;
if (this.dragStatus === 'draging') {
this.updateValue(this.newValue, true);
this.$emit('drag-end');
}
},
onClick(event) {
if (this.data.disabled)
return;
const { min } = this.data;
this.getRect('.van-slider').then((rect) => {
const value = (event.detail.x - rect.left) / rect.width * this.getRange() + min;
this.updateValue(value, true);
});
},
updateValue(value, end, drag) {
value = this.format(value);
const { barHeight, min } = this.data;
const width = `${((value - min) * 100) / this.getRange()}%`;
this.setData({
value,
barStyle: `
width: ${width};
height: ${addUnit(barHeight)};
${drag ? 'transition: none;' : ''}
`,
});
if (drag) {
this.$emit('drag', { value });
}
if (end) {
this.$emit('change', value);
}
},
getRange() {
const { max, min } = this.data;
return max - min;
},
format(value) {
const { max, min, step } = this.data;
return Math.round(Math.max(min, Math.min(value, max)) / step) * step;
}
}
});