misskey/src/client/components/ui/select.vue

<template>
<div class="eiipwacr" :class="{ focused, disabled, filled, inline }">
	<div class="icon" ref="icon"><slot name="icon"></slot></div>
	<div class="input" @click="focus">
		<span class="label" ref="label"><slot name="label"></slot></span>
		<div class="prefix" ref="prefix"><slot name="prefix"></slot></div>
		<select ref="input"
			v-model="v"
			:required="required"
			:disabled="disabled"
			@focus="focused = true"
			@blur="focused = false"
		>
			<slot></slot>
		</select>
		<div class="suffix"><slot name="suffix"></slot></div>
	</div>
	<div class="text"><slot name="text"></slot></div>
</div>
</template>

<script lang="ts">
import Vue from 'vue';

export default Vue.extend({
	props: {
		value: {
			required: false
		},
		required: {
			type: Boolean,
			required: false
		},
		disabled: {
			type: Boolean,
			required: false
		},
		inline: {
			type: Boolean,
			required: false,
			default: false
		},
	},
	data() {
		return {
			focused: false
		};
	},
	computed: {
		v: {
			get() {
				return this.value;
			},
			set(v) {
				this.$emit('input', v);
			}
		},
		filled(): boolean {
			return true;
		}
	},
	mounted() {
		if (this.$refs.prefix) {
			this.$refs.label.style.left = (this.$refs.prefix.offsetLeft + this.$refs.prefix.offsetWidth) + 'px';
		}
	},
	methods: {
		focus() {
			this.$refs.input.focus();
		}
	}
});
</script>

<style lang="scss" scoped>
.eiipwacr {
	position: relative;
	margin: 32px 0;

	&:not(.inline):first-child {
		margin-top: 8px;
	}

	&:not(.inline):last-child {
		margin-bottom: 8px;
	}

	> .icon {
		position: absolute;
		top: 0;
		left: 0;
		width: 24px;
		text-align: center;
		line-height: 32px;

		&:not(:empty) + .input {
			margin-left: 28px;
		}
	}

	> .input {
		display: flex;
		position: relative;

		&:before {
			content: '';
			display: block;
			position: absolute;
			bottom: 0;
			left: 0;
			right: 0;
			height: 1px;
			background: var(--inputBorder);
		}

		&:after {
			content: '';
			display: block;
			position: absolute;
			bottom: 0;
			left: 0;
			right: 0;
			height: 2px;
			background: var(--accent);
			opacity: 0;
			transform: scaleX(0.12);
			transition: border 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
			will-change: border opacity transform;
		}

		> .label {
			position: absolute;
			top: 0;
			left: 0;
			pointer-events: none;
			transition: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
			transition-duration: 0.3s;
			font-size: 1em;
			line-height: 32px;
			pointer-events: none;
			//will-change transform
			transform-origin: top left;
			transform: scale(1);
		}

		> select {
			display: block;
			flex: 1;
			width: 100%;
			padding: 0;
			font: inherit;
			font-weight: normal;
			font-size: 1em;
			height: 32px;
			background: none;
			border: none;
			border-radius: 0;
			outline: none;
			box-shadow: none;
			color: var(--fg);

			option,
			optgroup {
				background: var(--bg);
			}
		}

		> .prefix,
		> .suffix {
			display: block;
			align-self: center;
			justify-self: center;
			font-size: 1em;
			line-height: 32px;
			color: rgba(#000, 0.54);
			pointer-events: none;

			&:empty {
				display: none;
			}

			> * {
				display: block;
				min-width: 16px;
			}
		}

		> .prefix {
			padding-right: 4px;
		}

		> .suffix {
			padding-left: 4px;
		}
	}

	> .text {
		margin: 6px 0;
		font-size: 0.8em;

		&:empty {
			display: none;
		}

		* {
			margin: 0;
		}
	}

	&.focused {
		> .input {
			&:after {
				opacity: 1;
				transform: scaleX(1);
			}

			> .label {
				color: var(--accent);
			}
		}
	}

	&.focused,
	&.filled {
		> .input {
			> .label {
				top: -17px;
				left: 0 !important;
				transform: scale(0.75);
			}
		}
	}
}
</style>