v1.4.3 - 垂直虚拟滚动优化

src/components/GanttLinks.vue

@@ -24,6 +24,7 @@ interface Props {
   width: number
   height: number
   offsetLeft?: number // Canvas 在全局坐标系中的偏移量（用于虚拟渲染）
+  offsetTop?: number // Canvas 在垂直方向的偏移量（用于虚拟渲染）
   highlightedTaskId: number | null
   highlightedTaskIds: Set<number>
   hoveredTaskId: number | null
@@ -36,6 +37,7 @@ const props = withDefaults(defineProps<Props>(), {
   verticalLines: () => [],
   showVerticalLines: true,
   offsetLeft: 0,
+  offsetTop: 0,
 })
 
 // Canvas 引用
@@ -124,6 +126,8 @@ const drawLinks = () => {
   // 虚拟渲染：计算 Canvas 覆盖的范围
   const canvasStartX = props.offsetLeft
   const canvasEndX = props.offsetLeft + displayWidth
+  const canvasStartY = props.offsetTop
+  const canvasEndY = props.offsetTop + displayHeight
 
   // 定义线条数据类型
   interface LineData {
@@ -157,16 +161,6 @@ const drawLinks = () => {
         continue
       }
 
-      // 虚拟渲染：跳过不在 Canvas 覆盖范围内的关系线
-      // 如果起点和终点都在 Canvas 外，跳过
-      const fromX = fromBar.left + fromBar.width
-      const toX = toBar.left
-      const lineMinX = Math.min(fromX, toX)
-      const lineMaxX = Math.max(fromX, toX)
-      if (lineMaxX < canvasStartX || lineMinX > canvasEndX) {
-        continue // 完全在 Canvas 外，跳过
-      }
-
       // 判断高亮状态
       const fromIsPrimary = props.highlightedTaskId === predecessorId
       const toIsPrimary = props.highlightedTaskId === task.id
@@ -189,11 +183,26 @@ const drawLinks = () => {
       const globalX2 = toBar.left
       const globalY2 = toBar.top + toBar.height / 2 + toYOffset
 
+      // 虚拟渲染：跳过不在 Canvas 覆盖范围内的关系线
+      // 如果起点和终点都在 Canvas 外，跳过
+      const lineMinX = Math.min(globalX1, globalX2)
+      const lineMaxX = Math.max(globalX1, globalX2)
+      const lineMinY = Math.min(globalY1, globalY2)
+      const lineMaxY = Math.max(globalY1, globalY2)
+      if (
+        lineMaxX < canvasStartX ||
+        lineMinX > canvasEndX ||
+        lineMaxY < canvasStartY ||
+        lineMinY > canvasEndY
+      ) {
+        continue // 完全在 Canvas 外，跳过
+      }
+
       // 转换为 Canvas 局部坐标
       const x1 = globalX1 - props.offsetLeft
-      const y1 = globalY1
+      const y1 = globalY1 - props.offsetTop
       const x2 = globalX2 - props.offsetLeft
-      const y2 = globalY2
+      const y2 = globalY2 - props.offsetTop
 
       const c1x = x1 + 40
       const c1y = y1
@@ -369,6 +378,7 @@ watch(
     () => props.verticalLines,
     () => props.showVerticalLines,
     () => props.offsetLeft, // 监听虚拟渲染的偏移量变化
+    () => props.offsetTop,
   ],
   () => {
     // 使用 RAF 调度重绘，合并连续的多次变化为单次绘制
@@ -430,7 +440,7 @@ defineExpose({
       top: 0,
       width: `${width}px`,
       height: `${height}px`,
-      transform: `translateX(${offsetLeft}px)`,
+      transform: `translate(${offsetLeft}px, ${offsetTop}px)`,
       zIndex: highlightedTaskId !== null ? 1001 : 25,
       pointerEvents: 'none',
     }"

src/components/Timeline.vue

@@ -746,12 +746,12 @@ const debounce = <T extends (...args: unknown[]) => void>(func: T, wait: number)
 // 优化的滚动处理器（增加防抖时间到 50ms）
 const debouncedUpdatePositions = debounce(() => {
   computeAllMilestonesPositions()
-}, 50)
+}, 200)
 
 // 虚拟渲染：防抖更新 Canvas 位置（滚动时触发）
 const debouncedUpdateCanvasPosition = debounce(() => {
   updateSvgSize() // 重新计算 Canvas 位置和尺寸
-}, 50)
+}, 200)
 
 // 防抖更新纵向滚动位置
 const debouncedUpdateVerticalScroll = debounce((scrollTop: number) => {
@@ -1972,17 +1972,20 @@ const svgHeight = ref(0)
 const canvasWidth = ref(0)
 const canvasHeight = ref(0)
 const canvasOffsetLeft = ref(0) // Canvas 在全局坐标系中的偏移量
+const canvasOffsetTop = ref(0)
 
 // 虚拟渲染 Canvas 的安全宽度（防止超过浏览器限制）
 // 可根据实际需求调整：
 // - 5000: 最小内存 (~30MB)，适合低端设备，但滚动时更频繁更新
 // - 10000: 平衡选择 (~60MB)，覆盖小时视图 10 天，周视图 2 年
 const SAFE_CANVAS_WIDTH = 5000 // 平衡性能和覆盖范围
+const SAFE_CANVAS_HEIGHT = 5000
 
 function updateSvgSize() {
   if (bodyContentRef.value) {
     // 获取 bodyContent 的总宽度和可视区域宽度
     const totalWidth = bodyContentRef.value.offsetWidth
+    const totalHeight = contentHeight.value
 
     // 使用已经维护的 timelineScrollLeft，而不是从 DOM 重新读取
     // 因为 handleTimelineScroll 已经实时更新了这个值
@@ -2009,9 +2012,23 @@ function updateSvgSize() {
 
     canvasOffsetLeft.value = idealOffsetLeft
 
+    const clampedHeight = Math.min(totalHeight, SAFE_CANVAS_HEIGHT)
+    canvasHeight.value = clampedHeight
     svgWidth.value = canvasWidth.value
-    svgHeight.value = contentHeight.value
+    svgHeight.value = clampedHeight
-    canvasHeight.value = contentHeight.value
+
+    const scrollTop = timelineBodyScrollTop.value
+    const bufferTop = clampedHeight / 3
+    let idealOffsetTop = Math.max(0, scrollTop - bufferTop)
+
+    if (totalHeight <= clampedHeight) {
+      idealOffsetTop = 0
+    } else {
+      const maxOffsetTop = totalHeight - clampedHeight
+      idealOffsetTop = Math.min(idealOffsetTop, maxOffsetTop)
+    }
+
+    canvasOffsetTop.value = idealOffsetTop
   }
 }
 
@@ -2035,7 +2052,9 @@ function handleBarMounted(payload: {
       height: payload.height,
     },
   }
-  updateSvgSize()
+  setTimeout(() => {
+    updateSvgSize()
+  }, 200)
 }
 
 // 向上传递 TaskBar 拖拽/拉伸事件
@@ -2200,6 +2219,8 @@ const handleTaskListVerticalScroll = (event: CustomEvent) => {
   // 立即更新纵向滚动位置（用于虚拟滚动计算）
   timelineBodyScrollTop.value = scrollTop
 
+  debouncedUpdateCanvasPosition()
+
   if (timelineBodyElement.value && Math.abs(timelineBodyElement.value.scrollTop - scrollTop) > 1) {
     // 使用更精确的比较，避免1px以内的细微差异导致的循环触发
     timelineBodyElement.value.scrollTop = scrollTop
@@ -2216,6 +2237,8 @@ const handleTimelineBodyScroll = (event: Event) => {
   // 立即更新纵向滚动位置（用于虚拟滚动计算）
   timelineBodyScrollTop.value = scrollTop
 
+  debouncedUpdateCanvasPosition()
+
   // 拖拽时不同步滚动事件，避免性能问题
   if (isDragging.value) return
 
@@ -2830,7 +2853,7 @@ watch([timelineData, timelineContainerWidth], () => {
     nextTick(() => {
       setTimeout(() => {
         updateSvgSize()
-      }, 50)
+      }, 200)
     })
     taskBarRenderTimer = null
   }, 100)
@@ -3368,6 +3391,7 @@ const handleAddSuccessor = (task: Task) => {
           :width="canvasWidth"
           :height="canvasHeight"
           :offset-left="canvasOffsetLeft"
+          :offset-top="canvasOffsetTop"
           :highlighted-task-id="highlightedTaskId"
           :highlighted-task-ids="highlightedTaskIds"
           :hovered-task-id="hoveredTaskId"

src/composables/useI18n.ts

@@ -240,6 +240,29 @@ const messages = {
       },
     },
     disableTaskbarFocusMode: '关闭聚焦功能',
+    dataSourceAlreadyLoaded: '{name} 已是当前数据源',
+    dataSourceLoadSuccess: '已加载 {name}',
+    dataSourceLoadFailed: '{name} 加载失败',
+    dataSourceSwitch: {
+      title: '数据源切换',
+      subtitle: '对比常规与超大数据集的初始化体验',
+      loading: '数据加载中，请稍候...',
+      alreadyLoaded: '{name} 已是当前数据源',
+      loadSuccess: '已加载 {name}',
+      loadFailed: '{name} 加载失败',
+      sources: {
+        normal: {
+          label: '常规数据源',
+          description: 'data.json · 含完整前/后置依赖，适合功能演示',
+          badge: 'data.json',
+        },
+        large: {
+          label: '超大数据源',
+          description: 'data-large-1m.json · 百万级任务，验证虚拟渲染性能',
+          badge: 'data-large-1m.json',
+        },
+      },
+    },
   },
   'en-US': {
     dateNotSet: 'Not set',
@@ -478,6 +501,29 @@ const messages = {
       },
     },
     disableTaskbarFocusMode: 'Disable Focus Mode',
+    dataSourceAlreadyLoaded: '{name} is already active',
+    dataSourceLoadSuccess: '{name} loaded successfully',
+    dataSourceLoadFailed: '{name} failed to load',
+    dataSourceSwitch: {
+      title: 'Data Sources',
+      subtitle: 'Compare default vs. mega dataset initialization',
+      loading: 'Loading data, please wait…',
+      alreadyLoaded: '{name} is already active',
+      loadSuccess: '{name} loaded successfully',
+      loadFailed: '{name} failed to load',
+      sources: {
+        normal: {
+          label: 'Standard Dataset',
+          description: 'data.json · Full predecessor graph for feature demos',
+          badge: 'data.json',
+        },
+        large: {
+          label: 'Massive Dataset',
+          description: 'data-large-1m.json · Million-level tasks to stress virtual rendering',
+          badge: 'data-large-1m.json',
+        },
+      },
+    },
   },
 }