<template>
    <view class="uni-navbar" :class="{'uni-navbar-fixed':isFixed,'uni-navbar-shadow':hasShadow}" :style="{'background-color':backgroundColor}">
        <uni-status-bar v-if="insertStatusBar"></uni-status-bar>
        <view class="uni-navbar-header" :style="{color:color}">
            <view class="uni-navbar-header-btns" @tap="onClickLeft">
                <view v-if="leftIcon.length">
                    <image class="icon icon-left" src="../../../static/image/icon/icon-down.png"></image>
                </view>
                <view v-if="leftText.length" class="uni-navbar-btn-text" :class="{'uni-navbar-btn-icon-left':!leftIcon.length}">{{leftText}}</view>
                <slot name="left"></slot>
            </view>
            <view class="uni-navbar-container">
                <view v-if="title.length" class="uni-navbar-container-title">{{title}}</view>
                <!-- 标题插槽 -->
                <slot></slot>
            </view>
            <view class="uni-navbar-header-btns" @tap="onClickRight">
                <view v-if="rightIcon.length">
                    <image class="icon icon-right" src="../../../static/image/icon/icon-down.png"></image>
                </view>
                <!-- 优先显示图标 -->
                <view v-if="rightText.length&&!rightIcon.length" class="uni-navbar-btn-text">{{rightText}}</view>
                <slot name="right"></slot>
            </view>
        </view>
    </view>
</template>

<script>
    import uniStatusBar from './uni-status-bar.vue'

    export default {
        components: {
            uniStatusBar,
        },
        props: {
            /**
             * 标题文字
             */
            title: {
                type: String,
                default: ''
            },
            /**
             * 左侧按钮文本
             */
            leftText: {
                type: String,
                default: ''
            },
            /**
             * 右侧按钮文本
             */
            rightText: {
                type: String,
                default: ''
            },
            /**
             * 左侧按钮图标
             */
            leftIcon: {
                type: String,
                default: ''
            },
            /**
             * 右侧按钮图标
             */
            rightIcon: {
                type: String,
                default: ''
            },
            /**
             * 是否固定在顶部
             */
            fixed: {
                type: [Boolean, String],
                default: false
            },
            /**
             * 按钮图标和文字颜色
             */
            color: {
                type: String,
                default: '#000000'
            },
            /**
             * 背景颜色
             */
            backgroundColor: {
                type: String,
                default: '#FFFFFF'
            },
            /**
             * 是否包含状态栏，默认固定在顶部时包含
             */
            statusBar: {
                type: [Boolean, String],
                default: ''
            },
            /**
             * 是否使用阴影，默认根据背景色判断
             */
            shadow: {
                type: String,
                default: ''
            }
        },
        computed: {
            isFixed() {
                return String(this.fixed) === 'true'
            },
            insertStatusBar() {
                switch (String(this.statusBar)) {
                    case 'true':
                        return true
                    case 'false':
                        return false
                    default:
                        return this.isFixed
                }
            },
            hasShadow() {
                var backgroundColor = this.backgroundColor
                switch (String(this.shadow)) {
                    case 'true':
                        return true
                    case 'false':
                        return false
                    default:
                        return backgroundColor !== 'transparent' && backgroundColor.indexOf('rgba') < 0
                }
            }
        },
        methods: {
            /**
             * 左侧按钮点击事件
             */
            onClickLeft() {
                this.$emit('click-left')
            },
            /**
             * 右侧按钮点击事件
             */
            onClickRight() {
                this.$emit('click-right')
            }
        }
    }
</script>

<style>
    .uni-navbar {
        display: block;
        position: relative;
        width: 100%;
        background-color: #FFFFFF;
        overflow: hidden;
    }
    .icon{
        width: 30rpx;
        height: 18rpx;
    }
    .icon-left{
        transform: rotate(90deg);
        margin-left: 10rpx;
    }
    .icon-right{
        transform: rotate(-90deg);
        margin-right: 10rpx;
    }

    .uni-navbar view{
        line-height:44px;
    }

    .uni-navbar-shadow {
        box-shadow: 0 1px 6px #ccc;
    }

    .uni-navbar.uni-navbar-fixed {
        position: fixed;
        z-index: 998;
    }

    .uni-navbar-header {
        display: flex;
        flex-direction: row;
        width: 100%;
        height:44px;
        line-height:44px;
        font-size: 16px;
    }

    .uni-navbar-header .uni-navbar-header-btns{
        display:inline-flex;
        flex-wrap:nowrap;
        flex-shrink:0;
        width: 120upx;
        padding:0 12upx;
    }

    .uni-navbar-header .uni-navbar-header-btns:first-child{
        padding-left:0;
    }
    .uni-navbar-header .uni-navbar-header-btns:last-child{
        width: 60upx;
    }
    .uni-navbar-container{
        width:100%;
        margin:0 10upx;
    }
    .uni-navbar-container-title{
        font-size:30upx;
        text-align:center;
        padding-right: 60upx;
    }
</style>