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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">//
//
//
//
//
//
//
//
//
//
//
//
//
//
&nbsp;
import translateUtil from 'src/utils/transition';
import draggable from './draggable';
&nbsp;
const DEFAULT_ITEM_HEIGHT = 44;
&nbsp;
export default <span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" >{</span></span>
name: 'zan-picker-column',
&nbsp;
props: {
/**
* 每一列可见备选元素的个数
*/
visibileColumnCount: {
type: Number,
default: 5
},
/**
* 该列所有的可选值
*/
values: <span class="fstat-no" title="function not covered" >{</span>
type: Array,
default() {
<span class="cstat-no" title="statement not covered" > r</span>eturn [];
}
},
/**
* 每列添加额外的`className`
*/
className: {
type: String,
default: ''
},
/**
* 行高
*/
itemHeight: {
type: Number,
default: DEFAULT_ITEM_HEIGHT
},
value: {}
},
&nbsp;
data() {
<span class="cstat-no" title="statement not covered" > r</span>eturn {
currentValue: this.value,
currentValues: this.values,
isDragging: false
};
},
&nbsp;
watch: <span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" >{</span></span></span>
values(val) {
<span class="cstat-no" title="statement not covered" > t</span>his.currentValues = val;
},
&nbsp;
currentValues(val) {
<span class="cstat-no" title="statement not covered" > if (this.valueIndex === -1) {</span>
<span class="cstat-no" title="statement not covered" > t</span>his.currentValue = (val || [])[0];
}
},
&nbsp;
currentValue(val) {
<span class="cstat-no" title="statement not covered" > t</span>his.doOnValueChange();
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>his.$emit('change', this);
}
},
&nbsp;
computed: <span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" >{</span></span></span></span>
/**
* picker可见备选元素总高度
*/
visibleContentHeight() {
<span class="cstat-no" title="statement not covered" > r</span>eturn this.itemHeight * this.visibileColumnCount;
},
&nbsp;
/**
* 当前选中值在`values`中的索引
*/
valueIndex() {
<span class="cstat-no" title="statement not covered" > r</span>eturn this.currentValues.indexOf(this.currentValue);
},
&nbsp;
/**
* 计算picker的拖动范围
*/
dragRange() {
<span class="cstat-no" title="statement not covered" > v</span>ar values = this.currentValues;
<span class="cstat-no" title="statement not covered" > v</span>ar visibileColumnCount = this.visibileColumnCount;
<span class="cstat-no" title="statement not covered" > v</span>ar itemHeight = this.itemHeight;
&nbsp;
<span class="cstat-no" title="statement not covered" > r</span>eturn [ -itemHeight * (values.length - Math.ceil(visibileColumnCount / 2)), itemHeight * Math.floor(visibileColumnCount / 2) ];
},
&nbsp;
/**
* 计算`classNames`
*/
classNames() {
<span class="cstat-no" title="statement not covered" > r</span>eturn this.className.split(' ');
}
},
&nbsp;
mounted() {
<span class="cstat-no" title="statement not covered" > t</span>his.initEvents();
<span class="cstat-no" title="statement not covered" > t</span>his.doOnValueChange();
},
&nbsp;
methods: <span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" >{</span></span></span></span>
/**
* 将当前`value`值转换成需要垂直方向需要`translate`的值
*/
value2Translate(value) {
<span class="cstat-no" title="statement not covered" > l</span>et values = this.currentValues;
<span class="cstat-no" title="statement not covered" > l</span>et valueIndex = values.indexOf(value);
<span class="cstat-no" title="statement not covered" > l</span>et offset = Math.floor(this.visibileColumnCount / 2);
<span class="cstat-no" title="statement not covered" > l</span>et itemHeight = this.itemHeight;
&nbsp;
<span class="cstat-no" title="statement not covered" > if (valueIndex !== -1) {</span>
<span class="cstat-no" title="statement not covered" > r</span>eturn (valueIndex - offset) * (-itemHeight);
}
},
&nbsp;
/**
* 根据当前`translate`的值转换成当前选中的`value`
*/
translate2Value(translate) {
<span class="cstat-no" title="statement not covered" > l</span>et itemHeight = this.itemHeight;
<span class="cstat-no" title="statement not covered" > t</span>ranslate = Math.round(translate / itemHeight) * itemHeight;
&nbsp;
<span class="cstat-no" title="statement not covered" > l</span>et index = -(translate - Math.floor(this.visibileColumnCount / 2) * itemHeight) / itemHeight;
&nbsp;
<span class="cstat-no" title="statement not covered" > r</span>eturn this.currentValues[index];
},
&nbsp;
/**
* 初始化拖动事件
*/
initEvents() <span class="cstat-no" title="statement not covered" >{</span>
<span class="cstat-no" title="statement not covered" > v</span>ar el = this.$refs.wrapper;
<span class="cstat-no" title="statement not covered" > v</span>ar dragState = {};
&nbsp;
<span class="cstat-no" title="statement not covered" > v</span>ar velocityTranslate;
<span class="cstat-no" title="statement not covered" > v</span>ar prevTranslate;
<span class="cstat-no" title="statement not covered" > var pickerItems; // eslint-disable-line</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > d</span>raggable(el, {
start: <span class="fstat-no" title="function not covered" >(event) =&gt; {</span>
// 存储当前状态
<span class="cstat-no" title="statement not covered" > d</span>ragState = {
range: this.dragRange,
start: new Date(),
startLeft: event.pageX,
startTop: event.pageY,
startTranslateTop: translateUtil.getElementTranslate(el).top
};
<span class="cstat-no" title="statement not covered" > pickerItems = el.querySelectorAll('.zan-picker-item'); // eslint-disable-line</span>
},
&nbsp;
drag: <span class="fstat-no" title="function not covered" >(event) =&gt; {</span>
<span class="cstat-no" title="statement not covered" > t</span>his.isDragging = true;
&nbsp;
<span class="cstat-no" title="statement not covered" > d</span>ragState.left = event.pageX;
<span class="cstat-no" title="statement not covered" > d</span>ragState.top = event.pageY;
&nbsp;
<span class="cstat-no" title="statement not covered" > l</span>et deltaY = dragState.top - dragState.startTop;
<span class="cstat-no" title="statement not covered" > l</span>et translate = dragState.startTranslateTop + deltaY;
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>ranslateUtil.translateElement(el, null, translate);
&nbsp;
<span class="cstat-no" title="statement not covered" > v</span>elocityTranslate = translate - prevTranslate || translate;
&nbsp;
<span class="cstat-no" title="statement not covered" > p</span>revTranslate = translate;
},
&nbsp;
end: <span class="fstat-no" title="function not covered" >() =&gt; {</span>
<span class="cstat-no" title="statement not covered" > if (this.isDragging) {</span>
<span class="cstat-no" title="statement not covered" > t</span>his.isDragging = false;
&nbsp;
<span class="cstat-no" title="statement not covered" > v</span>ar momentumRatio = 7;
<span class="cstat-no" title="statement not covered" > v</span>ar currentTranslate = translateUtil.getElementTranslate(el).top;
<span class="cstat-no" title="statement not covered" > v</span>ar duration = new Date() - dragState.start;
&nbsp;
<span class="cstat-no" title="statement not covered" > v</span>ar momentumTranslate;
<span class="cstat-no" title="statement not covered" > if (duration &lt; 300) {</span>
<span class="cstat-no" title="statement not covered" > m</span>omentumTranslate = currentTranslate + velocityTranslate * momentumRatio;
}
&nbsp;
<span class="cstat-no" title="statement not covered" > v</span>ar dragRange = dragState.range;
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>his.$nextTick(<span class="fstat-no" title="function not covered" >() =&gt; {</span>
<span class="cstat-no" title="statement not covered" > v</span>ar translate;
<span class="cstat-no" title="statement not covered" > v</span>ar itemHeight = this.itemHeight;
&nbsp;
<span class="cstat-no" title="statement not covered" > if (momentumTranslate) {</span>
<span class="cstat-no" title="statement not covered" > t</span>ranslate = Math.round(momentumTranslate / itemHeight) * itemHeight;
} else {
<span class="cstat-no" title="statement not covered" > t</span>ranslate = Math.round(currentTranslate / itemHeight) * itemHeight;
}
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>ranslate = Math.max(Math.min(translate, dragRange[1]), dragRange[0]);
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>ranslateUtil.translateElement(el, null, translate);
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>his.currentValue = this.translate2Value(translate);
});
}
&nbsp;
<span class="cstat-no" title="statement not covered" > d</span>ragState = {};
}
});
},
&nbsp;
/**
* `value`改变时调用
*/
doOnValueChange() {
<span class="cstat-no" title="statement not covered" > l</span>et value = this.currentValue;
<span class="cstat-no" title="statement not covered" > l</span>et wrapper = this.$refs.wrapper;
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>his.$emit('input', this.currentValue);
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>ranslateUtil.translateElement(wrapper, null, this.value2Translate(value));
}
}
};
&nbsp;
&nbsp;</pre></td></tr>
</table></pre>
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