<template> 
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    <view class="u-navbar"> 
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        <view 
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            class="u-navbar__placeholder" 
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            v-if="fixed && placeholder" 
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            :style="{ 
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                height: $u.addUnit($u.getPx(height) + $u.sys().statusBarHeight,'px'), 
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            }" 
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        ></view> 
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        <view :class="[fixed && 'u-navbar--fixed']"> 
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            <u-status-bar 
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                v-if="safeAreaInsetTop" 
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                :bgColor="bgColor" 
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            ></u-status-bar> 
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            <view 
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                class="u-navbar__content" 
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                :class="[border && 'u-border-bottom']" 
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                :style="{ 
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                    height: $u.addUnit(height), 
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                    backgroundColor: bgColor, 
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                }" 
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            > 
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                <view 
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                    class="u-navbar__content__left" 
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                    hover-class="u-navbar__content__left--hover" 
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                    hover-start-time="150" 
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                    @tap="leftClick" 
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                > 
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                    <slot name="left"> 
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                        <u-icon 
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                            v-if="leftIcon" 
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                            :name="leftIcon" 
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                            :size="leftIconSize" 
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                            :color="leftIconColor" 
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                        ></u-icon> 
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                        <text 
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                            v-if="leftText" 
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                            :style="{ 
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                                color: leftIconColor 
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                            }" 
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                            class="u-navbar__content__left__text" 
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                        >{{ leftText }}</text> 
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                    </slot> 
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                </view> 
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                <slot name="center"> 
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                    <text 
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                        class="u-line-1 u-navbar__content__title" 
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                        :style="[{ 
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                            width: $u.addUnit(titleWidth), 
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                        }, $u.addStyle(titleStyle)]" 
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                    >{{ title }}</text> 
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                </slot> 
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                <view 
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                    class="u-navbar__content__right" 
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                    v-if="$slots.right || rightIcon || rightText" 
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                    @tap="rightClick" 
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                > 
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                    <slot name="right"> 
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                        <u-icon 
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                            v-if="rightIcon" 
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                            :name="rightIcon" 
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                            size="20" 
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                        ></u-icon> 
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                        <text 
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                            v-if="rightText" 
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                            class="u-navbar__content__right__text" 
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                        >{{ rightText }}</text> 
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                    </slot> 
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                </view> 
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            </view> 
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        </view> 
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    </view> 
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</template> 
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<script> 
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    import props from './props.js'; 
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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uni-app带的导航栏。 
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     * @tutorial https://www.uviewui.com/components/navbar.html 
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     * @property {Boolean}            safeAreaInsetTop    是否开启顶部安全区适配  (默认 true ) 
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     * @property {Boolean}            placeholder            固定在顶部时,是否生成一个等高元素,以防止塌陷 (默认 false ) 
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     * @property {Boolean}            fixed                导航栏是否固定在顶部 (默认 false ) 
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     * @property {Boolean}            border                导航栏底部是否显示下边框 (默认 false ) 
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     * @property {String}            leftIcon            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}            leftText            左边的提示文字 
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     * @property {String}            rightText            右边的提示文字 
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     * @property {String}            rightIcon            右边返回图标的名称,只能为uView自带的图标 
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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}            bgColor                导航栏背景设置 (默认 '#ffffff' ) 
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     * @property {String | Number}    titleWidth            导航栏标题的最大宽度,内容超出会以省略号隐藏 (默认 '400rpx' ) 
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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)(默认 '44px' ) 
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     * @property {String | Number}    leftIconSize        左侧返回图标的大小(默认 20px ) 
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     * @property {String | Number}    leftIconColor        左侧返回图标的颜色(默认 #303133 ) 
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     * @property {Boolean}            autoBack            点击左侧区域(返回图标),是否自动返回上一页(默认 false ) 
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     * @property {Object | String}    titleStyle            标题的样式,对象或字符串 
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     * @event {Function} leftClick        点击左侧区域 
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     * @event {Function} rightClick        点击右侧区域 
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     * @example <u-navbar title="剑未配妥,出门已是江湖" left-text="返回" right-text="帮助" @click-left="onClickBack" @click-right="onClickRight"></u-navbar> 
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     */ 
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    export default { 
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        name: 'u-navbar', 
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        mixins: [uni.$u.mpMixin, uni.$u.mixin, props], 
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        data() { 
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            return { 
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            } 
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        }, 
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        methods: { 
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            // 点击左侧区域 
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            leftClick() { 
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                // 如果配置了autoBack,自动返回上一页 
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                this.$emit('leftClick') 
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                if(this.autoBack) { 
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                    uni.navigateBack() 
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                } 
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            }, 
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            // 点击右侧区域 
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            rightClick() { 
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                this.$emit('rightClick') 
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            }, 
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        } 
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    } 
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</script> 
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<style lang="scss" scoped> 
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    @import "../../libs/css/components.scss"; 
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    .u-navbar { 
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        &--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: 11; 
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        } 
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        &__content { 
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            @include flex(row); 
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            align-items: center; 
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            height: 44px; 
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            background-color: #9acafc; 
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            position: relative; 
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            justify-content: center; 
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            &__left, 
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            &__right { 
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                padding: 0 13px; 
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                position: absolute; 
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                top: 0; 
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                bottom: 0; 
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                @include flex(row); 
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                align-items: center; 
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            } 
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            &__left { 
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                left: 0; 
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                &--hover { 
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                    opacity: 0.7; 
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                } 
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                &__text { 
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                    font-size: 15px; 
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                    margin-left: 3px; 
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                } 
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            } 
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            &__title { 
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                text-align: center; 
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                font-size: 16px; 
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                color: $u-main-color; 
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            } 
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            &__right { 
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                right: 0; 
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                &__text { 
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                    font-size: 15px; 
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                    margin-left: 3px; 
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                } 
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            } 
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        } 
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    } 
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</style> 
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