80 lines
2.9 KiB
Vue
80 lines
2.9 KiB
Vue
<script setup lang="ts">
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import type { StateEffect, Text } from '@codemirror/state'
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import type { EditorView } from '@codemirror/view'
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import { EditorState } from '@codemirror/state'
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import { computed, onBeforeUnmount, onMounted, ref, watch } from 'vue'
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import { createEditorView } from '../editor'
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import { activeTab, attachView, editorStateOf, noteRefOf, revealPending, storeViewState, ws } from '../workspace'
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const host = ref<HTMLElement>()
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const tab = computed(activeTab)
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let view: EditorView
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// 当前显示的笔记（以身份对象标识，重命名后不变）及各笔记的滚动位置。
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// 优先用滚动快照（锚定文档位置）：重设状态后视口外的行高会重新估算，单靠 scrollTop 会偏移几行；
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// 快照只对同一文档有效，笔记在后台被外部修改时退回 scrollTop
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interface ScrollPosition {
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doc: Text
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snapshot: StateEffect<unknown>
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top: number
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}
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let shown: { path: string } | undefined
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const scrollPositions = new WeakMap<object, ScrollPosition>()
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function show() {
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const path = ws.active
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const ref = path ? noteRefOf(path) : undefined
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const state = path ? editorStateOf(path) : undefined
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if (shown && shown !== ref) {
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storeViewState(shown.path, view.state)
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scrollPositions.set(shown, { doc: view.state.doc, snapshot: view.scrollSnapshot(), top: view.scrollDOM.scrollTop })
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}
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if (!ref || !state) {
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shown = undefined
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return
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}
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// 切换笔记，或该笔记的状态在别处被整体替换（如恢复草稿）时才重设
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if (shown !== ref || state.doc !== view.state.doc) {
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view.setState(state)
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const pos = scrollPositions.get(ref)
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// 等一帧：v-show 在此回调之后才取消 display:none，隐藏状态下无法滚动和聚焦
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requestAnimationFrame(() => {
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if (shown !== ref || revealPending(view, ref.path)) return
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if (pos?.doc === view.state.doc) view.dispatch({ effects: pos.snapshot })
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else view.scrollDOM.scrollTop = pos?.top ?? 0
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})
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}
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shown = ref
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}
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onMounted(() => {
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view = createEditorView(host.value!, EditorState.create())
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attachView(view)
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document.fonts.addEventListener('loadingdone', measure)
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show()
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})
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function measure() {
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view.requestMeasure()
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}
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onBeforeUnmount(() => {
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document.fonts.removeEventListener('loadingdone', measure)
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if (shown) storeViewState(shown.path, view.state)
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attachView(null)
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view.destroy()
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})
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watch(() => [ws.active, tab.value?.status, ws.view, ws.images], () => {
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show(); requestAnimationFrame(() => view.requestMeasure())
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}, { flush: 'post' })
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</script>
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<template>
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<div class="rm-editor-pane">
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<div v-show="tab && tab.status !== 'loading' && tab.status !== 'error'" ref="host" class="rm-editor-host" />
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<div v-if="!tab" class="rm-empty">
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<p>选择或新建一篇笔记</p>
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</div>
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<div v-else-if="tab.status === 'error'" class="rm-empty">
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<p>笔记打开失败</p>
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</div>
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</div>
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</template>
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