<template>
    <view class="u-section">
        <view class="u-section__title" :style="{
            fontWeight: bold ? 'bold' : 'normal',
            color: color,
            fontSize: fontSize + 'rpx',
            paddingLeft: showLine ? (fontSize * 0.7) + 'rpx' : 0
        }" :class="{
            'u-section--line': showLine
        }">
            <view class="u-section__title__icon-wrap u-flex" :style="[lineStyle]" v-if="showLine">
                <u-icon top="0" name="column-line" :size="fontSize * 1.25" bold :color="lineColor ? lineColor : color"></u-icon>
            </view>
            <text class="u-flex u-section__title__text">{{title}}</text>
        </view>
        <view class="u-section__right-info" v-if="right || $slots.right" :style="{
            color: subColor
        }" @tap="rightClick"> 
            <slot name="right" v-if="$slots.right" />
            <block v-else>
                {{subTitle}}
                <view class="u-section__right-info__icon-arrow u-flex" v-if="arrow">
                    <u-icon name="arrow-right" size="24" :color="subColor"></u-icon>
                </view>
            </block>
        </view>
    </view>
</template>

<script>
    /**
     * section 查看更多
     * @description 该组件一般用于分类信息有很多,但是限于篇幅只能列出一部分,让用户通过"查看更多"获得更多信息的场景,实际效果见演示。
     * @tutorial https://www.uviewui.com/components/section.html
     * @property {String} title 左边主标题
     * @property {String} sub-title 右边副标题(默认更多)
     * @property {Boolean} right 是否显示右边的内容(默认true)
     * @property {Boolean} showLine 是否显示左边的竖条(默认true)
     * @property {Boolean} arrow 是否显示右边箭头(默认true)
     * @property {String Number} font-size 主标题的字体大小(默认28)
     * @property {Boolean} bold 主标题是否加粗(默认true)
     * @property {String} color 主标题颜色(默认#303133)
     * @event {Function} click 组件右侧的内容被点击时触发,用于跳转"更多"
     * @example <u-section title="今日热门" :right="false"></u-section>
     */
    export default {
        name: "u-section",
        props: {
            // 标题信息
            title: {
                type: String,
                default: ''
            },
            // 右边副标题内容
            subTitle: {
                type: String,
                default: '更多'
            },
            // 是否显示右边的内容
            right: {
                type: Boolean,
                default: true
            },
            fontSize: {
                type: [Number, String],
                default: 28
            },
            // 主标题是否加粗
            bold: {
                type: Boolean,
                default: true
            },
            // 主标题的颜色
            color: {
                type: String,
                default: '#303133'
            },
            // 右边副标题的颜色
            subColor: {
                type: String,
                default: '#909399'
            },
            // 是否显示左边的竖条
            showLine: {
                type: Boolean,
                default: true
            },
            // 左边竖线的颜色
            lineColor: {
                type: String,
                default: ''
            },
            // 是否显示右边箭头
            arrow: {
                type: Boolean,
                default: true
            },
        },
        computed: {
            // 左边竖条的样式
            lineStyle() {
                // 由于安卓和iOS的,需要稍微调整绝对定位的top值,才能让左边的竖线和右边的文字垂直居中
                return {
                    // 由于竖线为字体图标,具有比实际线宽更宽的宽度,所以也需要根据字体打下动态调整
                    left: -(Number(this.fontSize) * 0.9) + 'rpx',
                    top: -(Number(this.fontSize) * (this.$u.os() == 'ios' ? 0.14 : 0.15)) + 'rpx',
                }
            }
        },
        methods: {
            rightClick() {
                this.$emit('click');
            }
        }
    }
</script>

<style lang="scss" scoped>
    @import "../../libs/css/style.components.scss";
    
    .u-section {
        @include vue-flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
        
        &__title {
            position: relative;
            font-size: 28rpx;
            padding-left: 20rpx;
            @include vue-flex;
            align-items: center;
            
            &__icon-wrap {
                position: absolute;
            }
            
            &__text {
                line-height: 1;
            }
        }
        
        &__right-info {
            color: $u-tips-color;
            font-size: 26rpx;
            @include vue-flex;
            align-items: center;
            
            &__icon-arrow {
                margin-left: 6rpx;
            }
        }
    }
</style>