import { VantComponent } from '../common/component';
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import { touch } from '../mixins/touch';
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import { canIUseModel } from '../common/version';
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import { getRect, addUnit } from '../common/utils';
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VantComponent({
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mixins: [touch],
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props: {
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range: Boolean,
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disabled: Boolean,
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useButtonSlot: Boolean,
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activeColor: String,
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inactiveColor: String,
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max: {
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type: Number,
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value: 100,
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},
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min: {
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type: Number,
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value: 0,
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},
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step: {
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type: Number,
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value: 1,
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},
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value: {
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type: null,
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value: 0,
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observer(val) {
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if (val !== this.value) {
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this.updateValue(val);
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}
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},
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},
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vertical: Boolean,
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barHeight: null,
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},
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created() {
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this.updateValue(this.data.value);
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},
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methods: {
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onTouchStart(event) {
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if (this.data.disabled)
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return;
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const { index } = event.currentTarget.dataset;
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if (typeof index === 'number') {
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this.buttonIndex = index;
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}
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this.touchStart(event);
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this.startValue = this.format(this.value);
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this.newValue = this.value;
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if (this.isRange(this.newValue)) {
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this.startValue = this.newValue.map((val) => this.format(val));
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}
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else {
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this.startValue = this.format(this.newValue);
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}
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this.dragStatus = 'start';
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},
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onTouchMove(event) {
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if (this.data.disabled)
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return;
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if (this.dragStatus === 'start') {
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this.$emit('drag-start');
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}
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this.touchMove(event);
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this.dragStatus = 'draging';
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getRect(this, '.van-slider').then((rect) => {
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const { vertical } = this.data;
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const delta = vertical ? this.deltaY : this.deltaX;
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const total = vertical ? rect.height : rect.width;
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const diff = (delta / total) * this.getRange();
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if (this.isRange(this.startValue)) {
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this.newValue[this.buttonIndex] =
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this.startValue[this.buttonIndex] + diff;
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}
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else {
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this.newValue = this.startValue + diff;
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}
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this.updateValue(this.newValue, false, true);
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});
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},
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onTouchEnd() {
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if (this.data.disabled)
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return;
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if (this.dragStatus === 'draging') {
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this.updateValue(this.newValue, true);
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this.$emit('drag-end');
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}
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},
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onClick(event) {
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if (this.data.disabled)
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return;
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const { min } = this.data;
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getRect(this, '.van-slider').then((rect) => {
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const { vertical } = this.data;
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const touch = event.touches[0];
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const delta = vertical
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? touch.clientY - rect.top
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: touch.clientX - rect.left;
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const total = vertical ? rect.height : rect.width;
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const value = Number(min) + (delta / total) * this.getRange();
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if (this.isRange(this.value)) {
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const [left, right] = this.value;
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const middle = (left + right) / 2;
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if (value <= middle) {
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this.updateValue([value, right], true);
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}
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else {
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this.updateValue([left, value], true);
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}
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}
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else {
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this.updateValue(value, true);
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}
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});
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},
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isRange(val) {
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const { range } = this.data;
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return range && Array.isArray(val);
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},
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handleOverlap(value) {
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if (value[0] > value[1]) {
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return value.slice(0).reverse();
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}
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return value;
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},
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updateValue(value, end, drag) {
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if (this.isRange(value)) {
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value = this.handleOverlap(value).map((val) => this.format(val));
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}
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else {
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value = this.format(value);
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}
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this.value = value;
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const { vertical } = this.data;
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const mainAxis = vertical ? 'height' : 'width';
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this.setData({
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wrapperStyle: `
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background: ${this.data.inactiveColor || ''};
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${vertical ? 'width' : 'height'}: ${addUnit(this.data.barHeight) || ''};
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`,
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barStyle: `
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${mainAxis}: ${this.calcMainAxis()};
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left: ${vertical ? 0 : this.calcOffset()};
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top: ${vertical ? this.calcOffset() : 0};
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${drag ? 'transition: none;' : ''}
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`,
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});
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if (drag) {
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this.$emit('drag', { value });
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}
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if (end) {
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this.$emit('change', value);
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}
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if ((drag || end) && canIUseModel()) {
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this.setData({ value });
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}
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},
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getScope() {
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return Number(this.data.max) - Number(this.data.min);
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},
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getRange() {
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const { max, min } = this.data;
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return max - min;
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},
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// 计算选中条的长度百分比
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calcMainAxis() {
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const { value } = this;
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const { min } = this.data;
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const scope = this.getScope();
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if (this.isRange(value)) {
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return `${((value[1] - value[0]) * 100) / scope}%`;
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}
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return `${((value - Number(min)) * 100) / scope}%`;
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},
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// 计算选中条的开始位置的偏移量
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calcOffset() {
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const { value } = this;
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const { min } = this.data;
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const scope = this.getScope();
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if (this.isRange(value)) {
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return `${((value[0] - Number(min)) * 100) / scope}%`;
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}
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return '0%';
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},
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format(value) {
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const { max, min, step } = this.data;
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return Math.round(Math.max(min, Math.min(value, max)) / step) * step;
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},
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},
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});
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