<template>
	<view class="u-keyboard" @touchmove.stop.prevent>
		<view class="u-keyboard-grids">
			<view
				class="u-keyboard-grids-item"
				:class="[btnBgGray(index) ? 'u-bg-gray' : '', index <= 2 ? 'u-border-top' : '', index < 9 ? 'u-border-bottom' : '', (index + 1) % 3 != 0 ? 'u-border-right' : '']"
				:style="[itemStyle(index)]"
				v-for="(item, index) in numList"
				:key="index"
				:hover-class="hoverClass(index)"
				:hover-stay-time="100"
				@tap="keyboardClick(item)"
			>
				<view class="u-keyboard-grids-btn">{{ item }}</view>
			</view>
			<view class="u-keyboard-grids-item u-bg-gray" hover-class="u-hover-class" :hover-stay-time="100" @touchstart.stop="backspaceClick" @touchend="clearTimer">
				<view class="u-keyboard-back u-keyboard-grids-btn"><u-icon name="backspace" :size="38" :bold="true"></u-icon></view>
			</view>
		</view>
	</view>
</template>

<script>
export default {
	props: {
		// 键盘的类型，number-数字键盘，card-身份证键盘
		mode: {
			type: String,
			default: 'number'
		},
		// 是否显示键盘的"."符号
		dotEnabled: {
			type: Boolean,
			default: true
		},
		// 是否打乱键盘按键的顺序
		random: {
			type: Boolean,
			default: false
		}
	},
	data() {
		return {
			backspace: 'backspace', // 退格键内容
			dot: '.', // 点
			timer: null, // 长按多次删除的事件监听
			cardX: 'X' // 身份证的X符号
		};
	},
	computed: {
		// 键盘需要显示的内容
		numList() {
			let tmp = [];
			if (!this.dotEnabled && this.mode == 'number') {
				if (!this.random) {
					return [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
				} else {
					return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, 0]);
				}
			} else if (this.dotEnabled && this.mode == 'number') {
				if (!this.random) {
					return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0];
				} else {
					return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0]);
				}
			} else if (this.mode == 'card') {
				if (!this.random) {
					return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0];
				} else {
					return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0]);
				}
			}
		},
		// 按键的样式，在非乱序&&数字键盘&&不显示点按钮时，index为9时，按键占位两个空间
		itemStyle() {
			return index => {
				let style = {};
				if (this.mode == 'number' && !this.dotEnabled && index == 9) style.flex = '0 0 66.6666666666%';
				return style;
			};
		},
		// 是否让按键显示灰色，只在非乱序&&数字键盘&&且允许点按键的时候
		btnBgGray() {
			return index => {
				if (!this.random && index == 9 && (this.mode != 'number' || (this.mode == 'number' && this.dotEnabled))) return true;
				else return false;
			};
		},
		hoverClass() {
			return index => {
				if(!this.random && index == 9 && (this.mode == 'number' && this.dotEnabled || this.mode == 'card')) return 'u-hover-class';
				else return 'u-keyboard-hover';
			}
		}
	},
	methods: {
		// 点击退格键
		backspaceClick() {
			this.$emit('backspace');
			 clearInterval(this.timer); //再次清空定时器，防止重复注册定时器
		      this.timer = setInterval(() => {
		    	  this.$emit('backspace');
		      }, 250);
		},
		clearTimer() {
			clearInterval(this.timer);
		},
		// 获取键盘显示的内容
		keyboardClick(val) { 
			// 允许键盘显示点模式和触发非点按键时，将内容转为数字类型
			if (this.dotEnabled && val != this.dot && val != this.cardX) val = Number(val);
			this.$emit('change', val);
		}
	}
};
</script>

<style lang="scss" scoped>
.u-keyboard {
	position: relative;
	z-index: 1003;
}

.u-keyboard-grids {
	display: flex;
	flex-wrap: wrap;
}

.u-keyboard-grids-item {
	flex: 0 0 33.3333333333%;
	text-align: center;
	font-size: 50rpx;
	color: #333;
	display: flex;
	align-items: center;
	justify-content: center;
	height: 110rpx;
	font-weight: 500;
}

.u-bg-gray {
	background-color: #e7e6eb;
}

.u-keyboard-back {
	font-size: 36rpx;
}

.u-keyboard-hover {
	background-color: #e7e6eb;
}
</style>
