<style lang="less">
    .ui-loading-mask {
        position: fixed;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        z-index: 9992;
    }

    .ui-loading-wrapper {
        position: absolute;
        margin: 0 auto;
        padding: 20rpx 64rpx;
        top: 50%;
        left: 50%;
        max-width: 670rpx;
        line-height: 20px;
        color: #fff;
        border: none;
        border-radius: 5px;
        background-color: rgba(0, 0, 0, 0.8);
        overflow: hidden;
        z-index: 9993;
        transform: translate(-50%, -50%);
    }

    .ui-loading-icon {
        margin: 10rpx auto;
        width: 80rpx;
        height: 80rpx;
        background: transparent
        url(data:image/svg+xml;base64,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)
        no-repeat;
        background-size: 100%;
        animation: ani-loading 1s steps(12, end) infinite;
    }

    .ui-loading {
        margin: 10rpx auto;
        font-size: 16px;
        text-align: center;
        word-break: break-all;
    }

    @keyframes ani-loading {
        0% {
            transform: rotate3d(0, 0, 1, 0deg);
        }
        100% {
            transform: rotate3d(0, 0, 1, 360deg);
        }
    }
</style>

<template lang="wxml">
    <view class="ui-loading-mask" wx:if="{{visible}}" @touchstart.stop="noop">
        <view class="ui-loading-wrapper">
            <view class="ui-loading-icon"></view>
            <view class="ui-loading">
                <text space="nbsp" decode="true">{{content}}</text>
            </view>
        </view>
    </view>
</template>

<script>
    import Wepy from 'wepy';

    export default class UILoading extends Wepy.component {
        constructor() {
            super();
            this.data = this._defaultData();
        }

        methods = {
            noop(e) {
                // Do nothing
                return false;
            }
        };

        _defaultData() {
            return {
                visible: false,
                content: '加载中'
            };
        }

        /**
         * 显示加载对话框。
         * @param {Object | String} options 配置项。
         * @param {String} options.content 提示文本。
         */
        show(options) {
            let conf = this._defaultData();
            if ('string' === typeof options) {
                conf = Object.assign(conf, {
                    content: String(options) || this._defaultData().content
                });
            } else {
                conf = Object.assign(conf, options);
            }

            this.visible = true;
            this.content = conf.content;
            this.$apply();
        }

        /**
         * 隐藏加载对话框。
         */
        hide() {
            const conf = this._defaultData();
            for (let prop in conf) {
                this[prop] = conf[prop];
            }
            this.$apply();
        }
    }
</script>