255 行
8.0 KiB
Plaintext
255 行
8.0 KiB
Plaintext
<template>
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<view ref="pageRef" class="page">
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<text class="tip">半屏弹窗，演示了弹出层内scroll-view滚动到顶时由滚变拖。本效果是通过监听TouchEvent实现，当半屏窗口移动时禁用scroll-view的滚动，避免两者的冲突。</text>
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<button class="bottomButton" @click="switchHalfScreen(true)">打开弹窗</button>
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<view ref="halfScreenRef" class="halfScreen" @touchstart="onHalfTouchStart" @touchmove="onHalfTouchMove"
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@touchend="onHalfTouchEnd">
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<view class="halfTitle">半屏弹窗标题</view>
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<scroll-view ref="halfScrollRef" class="halfScroll" bounces="true" :direction="scrollDirection">
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<view v-for="(item,index) in list" :key="index" class="item">
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half screen content-{{item}}
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</view>
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</scroll-view>
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</view>
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</view>
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</template>
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<script setup lang="uts">
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/**
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* @description: 支持从底部弹出、可拖拽下滑关闭的半屏弹窗，并处理弹窗拖拽与内部滚动的手势协调。
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* @logic: 点击按钮后弹出半屏窗口；当内部 scroll-view 滚动到顶部时，继续下滑会切换为拖拽半屏窗口，松手后根据位移和速度决定回弹或关闭。
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* @optimization: 通过在拖拽过程中动态切换内部 scroll-view 的滚动方向，避免拖拽弹窗与内容滚动同时生效造成手势冲突。
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*/
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const list = ref(['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15'])
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let totalHeight = 0 //总高度
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let halfMove = false //是否Move，响应TouchMove
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let halfScreenY = 0 //响应TouchMove的起始点Y坐标
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let halfOffset = 0 //偏移的位置，translateY
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let halfHeight = 0 //高度
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let lastY = 0 //上次
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let lastY2 = 0 //
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let bAnimation = false //是否动画
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const pageRef = ref<UniElement | null>(null)
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const halfScreenRef = ref<UniElement | null>(null)
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const halfScrollRef = ref<UniScrollViewElement | null>(null)
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const scrollDirection = ref('vertical')
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function onHalfTouchStart(event : TouchEvent) {
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halfScreenRef.value?.style?.setProperty('transition-duration', 0);
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}
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function onHalfTouchMove(e : TouchEvent) {
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if (bAnimation) {//容错处理
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return;
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}
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let top : number = halfScrollRef.value?.scrollTop ?? 0;
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let p = e.touches[0];
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lastY2 = lastY;
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lastY = p.screenY;
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if (top <= 0.01 || halfMove) {
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if (halfScreenY == 0) {
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halfScreenY = p.screenY;
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}
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let offset = p.screenY - halfScreenY;
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if (offset > 0) {//向下滚动
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halfMove = true;
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// #ifdef APP
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//halfScrollRef.value?.setAttribute('scroll-y', 'false');
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halfScrollRef.value?.setAttribute('direction', 'none');
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// #endif
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// #ifdef WEB || MP
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scrollDirection.value = 'none';
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// #endif
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halfScreenRef.value?.style?.setProperty('transform', 'translateY(' + offset.toFixed(2) + 'px)');
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halfOffset = offset;
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} else if (halfOffset > 0) {//向上滚动
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offset = halfScreenY - p.screenY;
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if (offset > halfOffset) {
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offset = 0;
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halfMove = false;
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}
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// #ifdef APP
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//halfScrollRef.value?.setAttribute('scroll-y', 'true');
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halfScrollRef.value?.setAttribute('direction', 'vertical');
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// #endif
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// #ifdef WEB || MP
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scrollDirection.value = 'vertical';
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// #endif
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halfScreenRef.value?.style?.setProperty('transform', 'translateY(' + offset.toFixed(2) + 'px)');
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halfOffset = offset;
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}
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}
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// #ifdef WEB
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e.preventDefault();
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// #endif
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}
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function switchHalfScreen(show : boolean) {
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if (show && ('visible' == halfScreenRef.value?.style?.getPropertyValue('visibility'))) {//容错处理
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console.log('quick click button!!!');
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return;
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}
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halfMove = false;
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// #ifdef APP
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//halfScrollRef.value?.setAttribute('scroll-y', 'true');
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halfScrollRef.value?.setAttribute('direction', 'vertical');
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// #endif
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// #ifdef WEB || MP
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scrollDirection.value = 'vertical';
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// #endif
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halfScreenY = 0;
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halfOffset = 0;
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let top = totalHeight;
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let time = 300;
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if (show) {
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top = totalHeight * 30 / 100; //计算显示的位置
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halfScreenRef.value?.style?.setProperty('visibility', 'visible');
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halfScreenRef.value?.style?.setProperty('transition-timing-function', 'ease-in-out');
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} else {
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halfScreenRef.value?.style?.setProperty('transition-timing-function', 'linear');
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time *= (halfHeight / totalHeight); //计算关闭动画时间
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}
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halfScreenRef.value?.style?.setProperty('transition-duration', time.toFixed(0)+'ms');
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halfScreenRef.value?.style?.setProperty('transition-property', 'top');
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halfScreenRef.value?.style?.setProperty('top', top.toFixed(2)+'px');
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setTimeout(() => {
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if (!show) {
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halfScreenRef.value?.style?.setProperty('visibility', 'hidden');
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halfScreenRef.value?.style?.setProperty('transition-duration', 0);
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halfScreenRef.value?.style?.setProperty('transform', '');
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}
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halfScreenRef.value?.style?.setProperty('transition-property', 'none');
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bAnimation = false;
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}, time)
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bAnimation = true;
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}
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function resumeHalfScreen() {
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let time = 300;//(500*halfOffset/halfHeight).toFixed(0); //回弹动画时间
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halfScreenRef.value?.style?.setProperty('transition-duration', time.toFixed(0)+'ms');
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halfScreenRef.value?.style?.setProperty('transition-timing-function', 'ease-in-out');
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halfScreenRef.value?.style?.setProperty('transition-property', 'transform');
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halfScreenRef.value?.style?.setProperty('transform', 'translateY(0px)');
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halfMove = false;
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// #ifdef APP
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//halfScrollRef.value?.setAttribute('scroll-y', 'true');
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halfScrollRef.value?.setAttribute('direction', 'vertical');
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// #endif
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// #ifdef WEB || MP
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scrollDirection.value = 'vertical';
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// #endif
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halfScreenY = 0;
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halfOffset = 0;
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setTimeout(() => {
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bAnimation = false;
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halfScreenRef.value?.style?.setProperty('transition-property', 'none');
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}, time)
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bAnimation = true;
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}
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function onHalfTouchEnd(event : TouchEvent) {
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halfScreenY = 0;
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if (bAnimation) {//容错处理
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return;
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}
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let top : number = halfScrollRef.value?.scrollTop ?? 0;
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let bHide = (halfHeight - halfOffset) < halfHeight / 4;
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if (bHide) {
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bHide = lastY2 > 0 && lastY2 <= lastY;
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} else if (top <= 0.01) {
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bHide = (lastY - lastY2) > 3; //向下滑动计算加速度判断是否关闭，简单处理未考虑时间
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}
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if (bHide) {
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switchHalfScreen(false);
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} else if (halfOffset > 0) {
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resumeHalfScreen();
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}
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}
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onReady(() => {
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halfScreenRef.value!.getBoundingClientRectAsync()!.then((rect: DOMRect) => {
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halfHeight = rect.height
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});
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pageRef.value!.getBoundingClientRectAsync()!.then((rect: DOMRect) => {
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totalHeight = rect.height
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halfScreenRef.value?.style?.setProperty('top', totalHeight.toFixed(2)+'px');
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});
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})
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onResize(() => {
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halfScreenRef.value?.getBoundingClientRectAsync()!.then((rect: DOMRect) => {
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halfHeight = rect.height
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});
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totalHeight = uni.getWindowInfo().windowHeight;
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halfScreenRef.value?.style?.setProperty('top', totalHeight.toFixed(2)+'px');
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halfScreenRef.value?.style?.setProperty('visibility', 'hidden');
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})
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// #ifndef MP
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onBackPress((): boolean => {
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if('visible' == halfScreenRef.value?.style?.getPropertyValue('visibility')){
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switchHalfScreen(false);
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return true;
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}
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return false;
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})
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// #endif
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</script>
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<style>
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/* #ifdef MP */
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page {
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overflow: hidden
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}
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/* #endif */
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.page {
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flex: 1;
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background-color: darkgrey;
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}
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.tip {
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margin: 10px
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}
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.bottomButton {
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position: absolute;
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width: 100%;
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bottom: 0px;
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/* #ifdef APP */
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padding-bottom: env(safe-area-inset-bottom, 0px);
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/* #endif */
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}
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.halfScreen {
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position: absolute;
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top: 100%;
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width: 100%;
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height: 70%;
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transition-timing-function: ease-in-out;
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/*ease ease-in ease-out ease-in-out linear step-start step-end*/
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transition-property: top;
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transition-duration: 0ms;
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visibility: hidden;
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}
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.halfTitle {
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align-items: center;
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justify-content: center;
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height: 48px;
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background-color: ghostwhite;
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border-radius: 10px 10px 0 0;
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}
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.halfScroll {
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background-color: white;
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flex: 1;
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}
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.item {
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height: 100px;
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}
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</style>
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