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316 lines
9.6 KiB
316 lines
9.6 KiB
3 years ago
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<template>
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<view class="">
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<view class="u-navbar" :style="[navbarStyle]" :class="{ 'u-navbar-fixed': isFixed, 'u-border-bottom': borderBottom }">
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<view class="u-status-bar" :style="{ height: statusBarHeight + 'px' }"></view>
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<view class="u-navbar-inner" :style="[navbarInnerStyle]">
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<view class="u-back-wrap" v-if="isBack" @tap="goBack">
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<view class="u-icon-wrap">
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<u-icon :name="backIconName" :color="backIconColor" :size="backIconSize"></u-icon>
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</view>
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<view class="u-icon-wrap u-back-text u-line-1" v-if="backText" :style="[backTextStyle]">{{ backText }}</view>
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</view>
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<view class="u-navbar-content-title" v-if="title" :style="[titleStyle]">
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<view
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class="u-title u-line-1"
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:style="{
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color: titleColor,
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fontSize: titleSize + 'rpx',
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fontWeight: titleBold ? 'bold' : 'normal'
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}">
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{{ title }}
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</view>
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</view>
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<view class="u-slot-content">
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<slot></slot>
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</view>
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<view class="u-slot-right">
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<slot name="right"></slot>
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</view>
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</view>
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</view>
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<!-- 解决fixed定位后导航栏塌陷的问题 -->
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<view class="u-navbar-placeholder" v-if="isFixed && !immersive" :style="{ width: '100%', height: Number(navbarHeight) + statusBarHeight + 'px' }"></view>
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</view>
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</template>
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<script>
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// 获取系统状态栏的高度
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let systemInfo = uni.getSystemInfoSync();
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let menuButtonInfo = {};
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// 如果是小程序，获取右上角胶囊的尺寸信息，避免导航栏右侧内容与胶囊重叠(支付宝小程序非本API，尚未兼容)
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// #ifdef MP-WEIXIN || MP-BAIDU || MP-TOUTIAO || MP-QQ
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menuButtonInfo = uni.getMenuButtonBoundingClientRect();
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// #endif
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/**
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* navbar 自定义导航栏
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* @description 此组件一般用于在特殊情况下，需要自定义导航栏的时候用到，一般建议使用uniapp自带的导航栏。
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* @tutorial https://www.uviewui.com/components/navbar.html
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* @property {String Number} height 导航栏高度(不包括状态栏高度在内，内部自动加上)，注意这里的单位是px（默认44）
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* @property {String} back-icon-color 左边返回图标的颜色（默认#606266）
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* @property {String} back-icon-name 左边返回图标的名称，只能为uView自带的图标（默认arrow-left）
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* @property {String Number} back-icon-size 左边返回图标的大小，单位rpx（默认30）
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* @property {String} back-text 返回图标右边的辅助提示文字
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* @property {Object} back-text-style 返回图标右边的辅助提示文字的样式，对象形式（默认{ color: '#606266' }）
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* @property {String} title 导航栏标题，如设置为空字符，将会隐藏标题占位区域
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* @property {String Number} title-width 导航栏标题的最大宽度，内容超出会以省略号隐藏，单位rpx（默认250）
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* @property {String} title-color 标题的颜色（默认#606266）
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* @property {String Number} title-size 导航栏标题字体大小，单位rpx（默认32）
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* @property {Function} custom-back 自定义返回逻辑方法
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* @property {String Number} z-index 固定在顶部时的z-index值（默认980）
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* @property {Boolean} is-back 是否显示导航栏左边返回图标和辅助文字（默认true）
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* @property {Object} background 导航栏背景设置，见官网说明（默认{ background: '#ffffff' }）
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* @property {Boolean} is-fixed 导航栏是否固定在顶部（默认true）
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* @property {Boolean} immersive 沉浸式，允许fixed定位后导航栏塌陷，仅fixed定位下生效（默认false）
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* @property {Boolean} border-bottom 导航栏底部是否显示下边框，如定义了较深的背景颜色，可取消此值（默认true）
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* @example <u-navbar back-text="返回" title="剑未配妥，出门已是江湖"></u-navbar>
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*/
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export default {
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name: "u-navbar",
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props: {
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// 导航栏高度，单位px，非rpx
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height: {
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type: [String, Number],
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default: ''
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},
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// 返回箭头的颜色
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backIconColor: {
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type: String,
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default: '#606266'
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},
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// 左边返回的图标
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backIconName: {
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type: String,
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default: 'nav-back'
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},
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// 左边返回图标的大小，rpx
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backIconSize: {
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type: [String, Number],
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default: '44'
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},
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// 返回的文字提示
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backText: {
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type: String,
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default: ''
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},
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// 返回的文字的 样式
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backTextStyle: {
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type: Object,
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default () {
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return {
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color: '#606266'
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}
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}
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},
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// 导航栏标题
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title: {
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type: String,
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default: ''
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},
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// 标题的宽度，如果需要自定义右侧内容，且右侧内容很多时，可能需要减少这个宽度，单位rpx
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titleWidth: {
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type: [String, Number],
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default: '250'
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},
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// 标题的颜色
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titleColor: {
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type: String,
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default: '#606266'
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},
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// 标题字体是否加粗
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titleBold: {
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type: Boolean,
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default: false
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},
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// 标题的字体大小
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titleSize: {
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type: [String, Number],
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default: 32
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},
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isBack: {
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type: [Boolean, String],
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default: true
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},
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// 对象形式，因为用户可能定义一个纯色，或者线性渐变的颜色
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background: {
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type: Object,
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default () {
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return {
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background: '#ffffff'
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}
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}
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},
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// 导航栏是否固定在顶部
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isFixed: {
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type: Boolean,
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default: true
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},
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// 是否沉浸式，允许fixed定位后导航栏塌陷，仅fixed定位下生效
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immersive: {
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type: Boolean,
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default: false
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},
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// 是否显示导航栏的下边框
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borderBottom: {
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type: Boolean,
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default: true
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},
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zIndex: {
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type: [String, Number],
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default: ''
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},
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// 自定义返回逻辑
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customBack: {
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type: Function,
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default: null
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}
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},
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data() {
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return {
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menuButtonInfo: menuButtonInfo,
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statusBarHeight: systemInfo.statusBarHeight
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};
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},
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computed: {
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// 导航栏内部盒子的样式
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navbarInnerStyle() {
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let style = {};
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// 导航栏宽度，如果在小程序下，导航栏宽度为胶囊的左边到屏幕左边的距离
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style.height = this.navbarHeight + 'px';
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// // 如果是各家小程序，导航栏内部的宽度需要减少右边胶囊的宽度
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// #ifdef MP
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let rightButtonWidth = systemInfo.windowWidth - menuButtonInfo.left;
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style.marginRight = rightButtonWidth + 'px';
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// #endif
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return style;
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},
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// 整个导航栏的样式
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navbarStyle() {
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let style = {};
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style.zIndex = this.zIndex ? this.zIndex : this.$u.zIndex.navbar;
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// 合并用户传递的背景色对象
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Object.assign(style, this.background);
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return style;
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},
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// 导航中间的标题的样式
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titleStyle() {
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let style = {};
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// #ifndef MP
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style.left = (systemInfo.windowWidth - uni.upx2px(this.titleWidth)) / 2 + 'px';
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style.right = (systemInfo.windowWidth - uni.upx2px(this.titleWidth)) / 2 + 'px';
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// #endif
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// #ifdef MP
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// 此处是为了让标题显示区域即使在小程序有右侧胶囊的情况下也能处于屏幕的中间，是通过绝对定位实现的
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let rightButtonWidth = systemInfo.windowWidth - menuButtonInfo.left;
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style.left = (systemInfo.windowWidth - uni.upx2px(this.titleWidth)) / 2 + 'px';
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style.right = rightButtonWidth - (systemInfo.windowWidth - uni.upx2px(this.titleWidth)) / 2 + rightButtonWidth +
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'px';
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// #endif
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style.width = uni.upx2px(this.titleWidth) + 'px';
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return style;
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},
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// 转换字符数值为真正的数值
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navbarHeight() {
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// #ifdef APP-PLUS || H5
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return this.height ? this.height : 44;
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// #endif
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// #ifdef MP
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// 小程序特别处理，让导航栏高度 = 胶囊高度 + 两倍胶囊顶部与状态栏底部的距离之差(相当于同时获得了导航栏底部与胶囊底部的距离)
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// 此方法有缺陷，暂不用(会导致少了几个px)，采用直接固定值的方式
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// return menuButtonInfo.height + (menuButtonInfo.top - this.statusBarHeight) * 2;//导航高度
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let height = systemInfo.platform == 'ios' ? 44 : 48;
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return this.height ? this.height : height;
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// #endif
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}
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},
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created() {},
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methods: {
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goBack() {
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// 如果自定义了点击返回按钮的函数，则执行，否则执行返回逻辑
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if (typeof this.customBack === 'function') {
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// 在微信，支付宝等环境(H5正常)，会导致父组件定义的customBack()函数体中的this变成子组件的this
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// 通过bind()方法，绑定父组件的this，让this.customBack()的this为父组件的上下文
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this.customBack.bind(this.$u.$parent.call(this))();
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} else {
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uni.navigateBack();
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}
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}
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}
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};
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</script>
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<style scoped lang="scss">
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@import "../../libs/css/style.components.scss";
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.u-navbar {
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width: 100%;
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}
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.u-navbar-fixed {
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position: fixed;
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left: 0;
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right: 0;
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top: 0;
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z-index: 991;
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}
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.u-status-bar {
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width: 100%;
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}
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.u-navbar-inner {
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@include vue-flex;
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justify-content: space-between;
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position: relative;
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align-items: center;
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}
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.u-back-wrap {
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@include vue-flex;
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align-items: center;
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flex: 1;
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flex-grow: 0;
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padding: 14rpx 14rpx 14rpx 24rpx;
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}
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.u-back-text {
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padding-left: 4rpx;
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font-size: 30rpx;
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}
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.u-navbar-content-title {
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@include vue-flex;
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align-items: center;
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justify-content: center;
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flex: 1;
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position: absolute;
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left: 0;
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right: 0;
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height: 60rpx;
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text-align: center;
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flex-shrink: 0;
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}
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.u-navbar-centent-slot {
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flex: 1;
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}
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.u-title {
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line-height: 60rpx;
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font-size: 32rpx;
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flex: 1;
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}
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.u-navbar-right {
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flex: 1;
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@include vue-flex;
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align-items: center;
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justify-content: flex-end;
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}
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.u-slot-content {
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flex: 1;
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@include vue-flex;
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align-items: center;
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}
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</style>
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