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<template>
	<view class="fui-digital__roller-wrap">
		<view class="fui-digital__roller" v-for="(items,index) in columns" :key="index" :style="getStyles">
			<!-- #ifndef APP-NVUE -->
			<view class="fui-digital__roller-column"
				:style="{transform:`translate3d(0, -${(keys[index] || 0)* rollHeight}px, 0)`,transitionDuration:`${duration}s`}">
				<text class="fui-digital__roller-item" :class="{'fui-digital__roller-color':!color}"
					v-for="(item,idx) in items" :key="idx"
					:style="{color:color,fontSize:size+'rpx',lineHeight:size+'rpx',fontWeight:fontWeight,height:rollHeight+'px'}">{{item}}</text>
			</view>
			<!-- #endif -->
			<!-- #ifdef APP-NVUE -->
			<view class="fui-digital__roller-column"
				:style="{transform:`translateY(-${(keys[index] || 0) * rollHeight}px)`}">
				<text class="fui-digital__roller-item" v-for="(item,idx) in items" :key="idx"
					:style="{color:getColor,fontSize:size+'rpx',lineHeight:size+'rpx',fontWeight:fontWeight,height:rollHeight+'px'}">{{item}}</text>
			</view>
			<!-- #endif -->
		</view>
	</view>
</template>

<script>
	export default {
		name: 'fui-digital-roller',
		props: {
			value: {
				type: [Number, String],
				default: ''
			},
			color: {
				type: String,
				default: ''
			},
			size: {
				type: [Number, String],
				default: 32
			},
			fontWeight: {
				type: [Number, String],
				default: 400
			},
			width: {
				type: [Number, String],
				default: 0
			},
			height: {
				type: [Number, String],
				default: 32
			},
			duration: {
				type: [Number, String],
				default: 1.2
			}
		},
		computed: {
			getStyles() {
				let styles = `height:${this.rollHeight}px;`;
				if (this.width && this.width != 0) {
					styles += `width:${this.width}rpx;`
				}
				return styles
			},
			getColor() {
				let color = this.color;
				// #ifdef APP-NVUE
				if (!color || color === true) {
					const app = uni && uni.$fui && uni.$fui.color;
					color = (app && app.primary) || '#465CFF';
				}
				// #endif
				return color;
			}
		},
		watch: {
			value(val) {
				this.initColumn(this.value)
			},
			height(val) {
				this.initHeight(val)
			}
		},
		data() {
			return {
				columns: [],
				keys: [],
				rollHeight: 0,
				rows: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
			};
		},
		created() {
			this.initHeight(this.height)
			this.initColumn(this.value)
		},
		methods: {
			initHeight(val) {
				let height = Math.floor(uni.upx2px(val || 0))
				height = height % 2 === 0 ? height : height + 1
				this.rollHeight = height
			},
			initColumn(val) {
				val = val + '';
				let vals = val.split('');
				let digit = vals.length,
					arr = [];
				for (let i = 0; i < digit; i++) {
					if (~this.rows.indexOf(vals[i])) {
						arr.push(this.rows)
					} else {
						arr.push([vals[i]])
					}
				}
				this.columns = arr;
				this.startRoll(vals)
			},
			startRoll(vals) {
				let lengths = this.columns.length,
					indexs = [];

				while (vals.length) {
					let num = vals.pop();
					if (~this.rows.indexOf(num)) {
						indexs.unshift(Number(num))
					} else {
						indexs.unshift(0)
					}
				}
				while (indexs.length < lengths) {
					indexs.unshift(0)
				}
				this.keys = indexs
			}
		}
	}
</script>

<style scoped>
	.fui-digital__roller-wrap {
		/* #ifndef APP-NVUE */
		display: inline-flex;
		/* #endif */
		flex-direction: row;
		justify-content: center;
		align-items: center;
	}

	.fui-digital__roller {
		overflow: hidden;
	}

	.fui-digital__roller-column {
		/* #ifndef APP-NVUE */
		display: flex;
		transform: translate3d(0, 0, 0);
		/* #endif */
		/* #ifdef APP-NVUE */
		transform: translateY(0);
		/* #endif */
		align-items: center;
		justify-content: center;
		flex-direction: column;
		transition-property: transform;
		/* #ifndef APP-NVUE */
		transition-timing-function: cubic-bezier(0, 1, 0, 1);
		/* #endif */
		/* #ifdef APP-NVUE */
		transition-timing-function: ease;
		transition-duration: .8s;
		/* #endif */
	}

	.fui-digital__roller-item {
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		align-items: center;
		justify-content: center;
		text-align: center;
	}

	/* #ifndef APP-NVUE */
	.fui-digital__roller-color {
		color: var(--fui-color-primary, #465CFF) !important;
	}

	/* #endif */
</style>