🎨

src/client/components/global/spacer.vue

@@ -0,0 +1,70 @@
+<template>
+<div ref="root" :class="$style.root" :style="{ padding: margin + 'px' }">
+	<div ref="content" :class="$style.content">
+		<slot></slot>
+	</div>
+</div>
+</template>
+
+<script lang="ts">
+import { defineComponent, onMounted, onUnmounted, ref } from 'vue';
+
+export default defineComponent({
+	props: {
+		contentMax: {
+			type: Number,
+			required: false,
+			default: null,
+		}
+	},
+
+	setup(props, context) {
+		let ro: ResizeObserver;
+		const root = ref<HTMLElement>(null);
+		const content = ref<HTMLElement>(null);
+		const margin = ref(0);
+		const adjust = (rect: { width: number; height: number; }) => {
+			if (rect.width > (props.contentMax || 500)) {
+				margin.value = 32;
+			} else {
+				margin.value = 12;
+			}
+		};
+
+		onMounted(() => {
+			ro = new ResizeObserver((entries) => {
+				adjust({
+					width: entries[0].borderBoxSize[0].inlineSize,
+					height: entries[0].borderBoxSize[0].blockSize,
+				});
+			});
+			ro.observe(root.value);
+
+			if (props.contentMax) {
+				content.value.style.maxWidth = `${props.contentMax}px`;
+			}
+		});
+
+		onUnmounted(() => {
+			ro.disconnect();
+		});
+
+		return {
+			root,
+			content,
+			margin,
+		};
+	},
+});
+</script>
+
+<style lang="scss" module>
+.root {
+	box-sizing: border-box;
+	width: 100%;
+}
+
+.content {
+	margin: 0 auto;
+}
+</style>

src/client/components/index.ts

@@ -14,6 +14,7 @@ import loading from './global/loading.vue';
 import error from './global/error.vue';
 import ad from './global/ad.vue';
 import header from './global/header.vue';
+import spacer from './global/spacer.vue';
 
 export default function(app: App) {
 	app.component('I18n', i18n);
@@ -30,4 +31,5 @@ export default function(app: App) {
 	app.component('MkError', error);
 	app.component('MkAd', ad);
 	app.component('MkHeader', header);
+	app.component('MkSpacer', spacer);
 }