1 line
5.2 KiB
JavaScript
1 line
5.2 KiB
JavaScript
import{__decorate}from"tslib";import{SuperComponent,wxComponent}from"../common/src/index";import config from"../common/config";import props from"./props";const{prefix:prefix}=config,name=`${prefix}-picker-item`,ANIMATION_DURATION_BASE=300,ANIMATION_DURATION_MAX=600,INERTIA_TIME=300,INERTIA_DISTANCE=15,VIRTUAL_SCROLL_CONFIG={ENABLE_THRESHOLD:100,BUFFER_COUNT:8,THROTTLE_TIME:16,FAST_SCROLL_BUFFER:12,FAST_SCROLL_THRESHOLD:50},range=function(t,e,i){return Math.min(Math.max(t,e),i)},momentum=(t,e)=>{let i=t;return i=Math.abs(i/e)/.005*(i<0?-1:1),i};let PickerItem=class extends SuperComponent{constructor(){super(...arguments),this.relations={"../picker/picker":{type:"parent"}},this.options={multipleSlots:!0},this.externalClasses=[`${prefix}-class`],this.properties=Object.assign(Object.assign({},props),{useSlots:{type:Boolean,value:!0}}),this.observers={"options, keys"(){this.update()}},this.data={prefix:prefix,classPrefix:name,offset:0,duration:0,value:"",curIndex:0,columnIndex:0,keys:{},formatOptions:props.options.value,enableVirtualScroll:!1,visibleOptions:[],virtualStartIndex:0,virtualOffsetY:0,totalHeight:0,itemHeight:40,visibleItemCount:5,wrapperPaddingY:72},this.lifetimes={created(){this.StartY=0,this.StartOffset=0,this.startTime=0,this._animationTimer=null},detached(){this._animationTimer&&(clearInterval(this._animationTimer),this._animationTimer=null)}},this.methods={onClickItem(t){const{index:e}=t.currentTarget.dataset,{itemHeight:i}=this.data,a=range(e,0,this.getCount()-1);a!==this._selectedIndex&&this.setData({offset:-a*i,curIndex:a,duration:200}),this.updateSelected(a,!0)},onTouchStart(t){this.StartY=t.touches[0].clientY,this.StartOffset=this.data.offset,this.startTime=Date.now(),this.setData({duration:0})},onTouchMove(t){const{StartY:e,StartOffset:i}=this,{itemHeight:a}=this.data,n=t.touches[0].clientY-e,s=range(i+n,-(this.getCount()-1)*a,0);this.setData({offset:s})},onTouchEnd(t){const{offset:e,itemHeight:i,enableVirtualScroll:a,formatOptions:n}=this.data,{startTime:s}=this;if(e===this.StartOffset)return;let o=0;const r=t.changedTouches[0].clientY-this.StartY,l=Date.now()-s;l<300&&Math.abs(r)>15&&(o=momentum(r,l));const d=range(e+o,-this.getCount()*i,0),h=range(Math.round(-d/i),0,this.getCount()-1),u=-h*i,m=Math.abs(u-e)/i,c=Math.min(600,300+30*m),p=Math.abs(o)>3*i?VIRTUAL_SCROLL_CONFIG.FAST_SCROLL_BUFFER:VIRTUAL_SCROLL_CONFIG.BUFFER_COUNT;this._animationTimer&&(clearInterval(this._animationTimer),this._animationTimer=null);const f={offset:u,duration:c,curIndex:h};if(a){const t=Math.floor(Math.abs(e)/i),a=h,s=Math.min(t,a),o=Math.max(t,a),r=Math.max(0,s-p),l=Math.min(n.length,o+this.data.visibleItemCount+p);f.visibleOptions=n.slice(r,l),f.virtualStartIndex=r,f.virtualOffsetY=r*i}this.setData(f,()=>{if(a){const t=this.computeVirtualRange(u,n.length,i,!1);this.setData({visibleOptions:n.slice(t.startIndex,t.endIndex),virtualStartIndex:t.startIndex,virtualOffsetY:t.startIndex*i})}}),h!==this._selectedIndex&&this.updateSelected(h,!0)},formatOption:(t,e,i)=>"function"!=typeof i?t:t.map(t=>i(t,e)),updateSelected(t,e){var i,a,n;const{columnIndex:s,keys:o,formatOptions:r}=this.data;this._selectedIndex=t,this._selectedValue=null===(i=r[t])||void 0===i?void 0:i[null==o?void 0:o.value],this._selectedLabel=null===(a=r[t])||void 0===a?void 0:a[null==o?void 0:o.label],e&&(null===(n=this.$parent)||void 0===n||n.triggerColumnChange({index:t,column:s}))},update(){var t;const{options:e,value:i,keys:a,format:n,columnIndex:s,itemHeight:o,visibleItemCount:r}=this.data,l=this.formatOption(e,s,n),d=l.length,h=d>=VIRTUAL_SCROLL_CONFIG.ENABLE_THRESHOLD;let u=-1;if(d>500){u=null!==(t=new Map(l.map((t,e)=>[t[null==a?void 0:a.value],e])).get(i))&&void 0!==t?t:-1}else u=l.findIndex(t=>t[null==a?void 0:a.value]===i);const m=u>0?u:0,c={formatOptions:l,offset:-m*o,curIndex:m,enableVirtualScroll:h,totalHeight:d*o,wrapperPaddingY:(r-1)/2*o};if(h){const t=this.computeVirtualRange(-m*o,d,o);c.visibleOptions=l.slice(t.startIndex,t.endIndex),c.virtualStartIndex=t.startIndex,c.virtualOffsetY=t.startIndex*o}else c.visibleOptions=l,c.virtualStartIndex=0,c.virtualOffsetY=0;this.setData(c,()=>{this.updateSelected(m,!1)})},computeVirtualRange(t,e,i,a=!1){const n=Math.abs(t),{BUFFER_COUNT:s,FAST_SCROLL_BUFFER:o}=VIRTUAL_SCROLL_CONFIG,{visibleItemCount:r}=this.data,l=a?o:s,d=Math.floor(n/i);return{startIndex:Math.max(0,d-l),endIndex:Math.min(e,d+r+l)}},updateVisibleOptions(t,e=!1){const{formatOptions:i,itemHeight:a,enableVirtualScroll:n}=this.data;if(!n)return;const s=void 0!==t?t:this.data.offset,o=this.computeVirtualRange(s,i.length,a,e);o.startIndex===this.data.virtualStartIndex&&o.endIndex===this.data.virtualStartIndex+this.data.visibleOptions.length||this.setData({visibleOptions:i.slice(o.startIndex,o.endIndex),virtualStartIndex:o.startIndex,virtualOffsetY:o.startIndex*a})},getCount(){var t,e;return null===(e=null===(t=this.data)||void 0===t?void 0:t.options)||void 0===e?void 0:e.length},getCurrentSelected(){var t,e;const{offset:i,itemHeight:a,formatOptions:n,keys:s}=this.data,o=Math.max(0,Math.min(Math.round(-i/a),this.getCount()-1));return{index:o,value:null===(t=n[o])||void 0===t?void 0:t[null==s?void 0:s.value],label:null===(e=n[o])||void 0===e?void 0:e[null==s?void 0:s.label]}}}}};PickerItem=__decorate([wxComponent()],PickerItem);export default PickerItem; |