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perf(DataGrid): reduce column header clip allocation
Gallery qualification: DataGridShowCase declares 65 DataGrid instances and 210 column declarations, including multiple frozen-column examples with LeftFrozenColumnCount and RightFrozenColumnCount. The optimized path applies to realized DataGridColumnHeader instances that require clipping under frozen columns or header viewport constraints. Operation frequency: column header presenter arrange runs during initial layout, horizontal scrolling, resizing, column width changes, and grid relayout. Previously each clipped header arrange allocated a new RectangleGeometry. Avalonia source basis: Visual.Clip is a styled property registered with AffectsRender, and InvalidateVisual marks the visual dirty (.referenceprojects/Avalonia/src/Avalonia.Base/Visual.cs:52-53,141-149,418-421,446-500). RectangleGeometry.Rect participates in geometry invalidation (.referenceprojects/Avalonia/src/Avalonia.Base/Media/RectangleGeometry.cs:25-33; .referenceprojects/Avalonia/src/Avalonia.Base/Media/Geometry.cs:146-172). Benefit: repeated clipped column header arrange now reuses one RectangleGeometry after first use, reducing repeated clip geometry allocation from 1/clipped header arrange to 0 after first while preserving Clip clearing when clipping is no longer needed. Verification: dotnet build -c Release -f net10.0 tools/performances/AtomUI.Performance/AtomUI.Performance.csproj; dotnet run -c Release -f net10.0 --no-build --project tools/performances/AtomUI.Performance/AtomUI.Performance.csproj -- --verify-datagrid-states; dotnet run -c Release -f net10.0 --no-build --project tools/performances/AtomUI.Performance/AtomUI.Performance.csproj -- --suite datagrid --count 100; git diff --check.
This commit is contained in:
chinboy
@@ -1,7 +1,7 @@
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# DataGrid 性能优化
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> 路线图位置：[`../desktop-controls-optimization-roadmap.md`](../desktop-controls-optimization-roadmap.md) Phase F / Tier 4
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> 状态：T4.1 cell header-state binding + row/row group header pointer handler + core input handler + rows presenter scroll gesture / clip geometry + row gridline / details presenter / cell clip geometry cleanup partial done；T4.2 column filter flyout lifecycle + filter indicator binding + column/group header pointer handler cleanup partial done；T4.3 special column detach lifecycle + row expander details binding partial done；T4.4 column reorder drag indicator render partial done；T4.5 row details presenter measure registration partial done；DataGrid core / row / virtualization 仍待后续专项。
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> 状态：T4.1 cell header-state binding + row/row group header pointer handler + core input handler + rows presenter scroll gesture / clip geometry + row gridline / details presenter / cell clip geometry cleanup partial done；T4.2 column filter flyout lifecycle + filter indicator binding + column/group header pointer handler + column header clip cleanup partial done；T4.3 special column detach lifecycle + row expander details binding partial done；T4.4 column reorder drag indicator render partial done；T4.5 row details presenter measure registration partial done；DataGrid core / row / virtualization 仍待后续专项。
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---
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@@ -15,6 +15,7 @@
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- filter indicator 可见性不再为每个列头创建 3 路 `MultiBinding` + converter，改为列头 DirectProperty + `{TemplateBinding}`。
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- column header hover 不再为每个 realized `DataGridColumnHeader` 注册本地 `PointerEntered` / `PointerExited` handler，改走 Avalonia 的 virtual override 路径。
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- column header press/release/move 不再为每个 realized `DataGridColumnHeader` 注册本地 handler；内部 resize/reorder/sort 逻辑和 `DataGridColumn.HeaderPointerPressed/Released` 转发都改为 class handler。
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- `DataGridColumnHeader` 在 frozen-column 裁剪路径不再每次 header presenter arrange 新建 clip `RectangleGeometry`，改为 header 级复用；不需要裁剪时仍清空 `Clip`。
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- column group header press/release 不再为每个 realized `DataGridColumnGroupHeader` 注册本地 forwarding lambda，改为 class handler 转发到 `DataGridColumnGroupItem.HeaderPointerPressed/Released`。
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- row header press 不再为每个 realized `DataGridRowHeader` 注册本地 `PointerPressed` handler，改为 class handler，同时保留 focus / selection / current slot 行为。
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- row group header press 不再为每个 realized `DataGridRowGroupHeader` 注册本地 `PointerPressed` lambda，改为 class handler，同时保留 current slot 行为。
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@@ -96,6 +97,7 @@ Gallery source：`controlgallery/AtomUIGallery/ShowCases/Views/DataDisplay/DataG
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| Runtime `Filters` collection visibility refresh | binding-path dependent | explicit `CollectionChanged` refresh | correctness path added | 正确性修复；add/clear filter items 均验证 |
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| Column header local hover routed handlers | 2 per realized header | 0 per realized header | 100.00% removed | 结构/分配优化；hover 语义保留在 `OnPointerEntered` / `OnPointerExited` override |
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| Column header local press/release/move handlers | 5 per standard header | 0 per standard header | 100.00% removed | 结构/分配优化；internal handler + public column event forwarding 均迁到 class handler |
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| Column header clip geometry allocation | 1 new `RectangleGeometry` per clipped header arrange | 0 new `RectangleGeometry` per clipped header arrange after first | 100.00% repeated-arrange allocation removed | 结构/分配优化；frozen-column header clip instance 复用、Rect 更新和 clear 已验证 |
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| Column group header forwarding handlers | 2 per group header | 0 per group header | 100.00% removed | 结构/分配优化；Gallery group header 示例有 4 个 group items |
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| Row header local press handler | 1 per row header | 0 per row header | 100.00% removed | 结构/分配优化；行头点击 selection / current slot 语义已验证 |
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| Row group header local press handler | 1 per row group header | 0 per row group header | 100.00% removed | 结构/分配优化；分组头点击 current slot 语义已验证 |
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@@ -569,6 +571,32 @@ Gallery `Grouping table head` 示例声明 4 个 `DataGridColumnGroupItem`，页
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| DataGrid.RowGroups | 10.897 | 2998.9 | 321.0 | 1.0 | smoke 通过；timing 只作异常检查 |
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| DataGrid.GalleryShape | 45.449 | 12482.3 | 1260.0 | 5.0 | smoke 通过；timing 只作异常检查 |
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### 2.20 Column header clip geometry allocation
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本轮优化点：`DataGridColumnHeadersPresenter.EnsureColumnHeaderClip()` 原先只要 scrolling column header 被 frozen columns 或右侧边界裁剪，每次 header presenter arrange 都会创建新的 `RectangleGeometry` 并赋给 `DataGridColumnHeader.Clip`。真实 Gallery `DataGridShowCase` 声明 65 个 `DataGrid`、210 个 column declarations，多个 frozen-column 示例设置 `LeftFrozenColumnCount` / `RightFrozenColumnCount`；水平滚动、窗口尺寸变化、列宽变化和 grid relayout 都会触发 header presenter arrange。
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修复后 `DataGridColumnHeader` 持有一个 `_clipGeometry`，首次需要裁剪时创建，后续只更新 `Rect`；裁剪不再需要或列头进入 frozen 区时仍清空 `Clip`。由于 `Visual.Clip` 换引用会触发 `AffectsRender`，而复用 geometry 只更新 `RectangleGeometry.Rect`，本轮在 `Rect` 变化时显式 `InvalidateVisual()`，保持裁剪刷新语义。
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| 场景 | baseline | optimized | 改善 | 结论 |
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| --- | --- | --- | --- | --- |
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| Column header clip allocation / repeated arrange | 1 new `RectangleGeometry` / clipped header arrange | 0 new `RectangleGeometry` / clipped header arrange after first | 100.00% repeated allocation removed | 有效；每 header 生命周期内从 `N` 次分配降到 `1` 次 |
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| 6-column frozen-header verification pass | 1 new `RectangleGeometry` / clipped scrolling header pass | 0 new `RectangleGeometry` / clipped scrolling header pass after first | 100.00% repeated allocation removed | 结构收益；按验证场景单个 clipped scrolling header 估算 |
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| Clip geometry instance | replaced every arrange | reused across repeated arrange and horizontal offset change | reuse verified | `--verify-datagrid-states` 覆盖 |
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| Clip clear path | assign `Clip = null` | `ClearClipGeometry()` clears `Clip` while keeping reusable cache | 行为保留 | frozen clipping 取消后 `Clip` 清空已验证 |
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当前工作区 smoke：
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| Scenario | ms/item | KB/item | Visual/root | Logical/root | 结论 |
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| --- | ---: | ---: | ---: | ---: | --- |
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| DataGrid.Basic | 16.045 | 2964.7 | 305.0 | 1.0 | smoke 通过；timing 只作异常检查 |
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| DataGrid.Filter.Menu.Closed | 10.194 | 2599.2 | 267.0 | 1.0 | smoke 通过；timing 只作异常检查 |
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| DataGrid.Filter.Tree.Closed | 9.336 | 2596.4 | 267.0 | 1.0 | smoke 通过；timing 只作异常检查 |
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| DataGrid.RowHeaders | 11.296 | 3122.9 | 336.0 | 1.0 | smoke 通过；timing 只作异常检查 |
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| DataGrid.RowDetails.Collapsed | 11.803 | 3041.9 | 320.0 | 1.0 | smoke 通过；timing 只作异常检查 |
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| DataGrid.GroupHeaders | 9.993 | 2592.3 | 266.0 | 1.0 | smoke 通过；timing 只作异常检查 |
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| DataGrid.RowGroups | 11.546 | 2998.7 | 321.0 | 1.0 | smoke 通过；timing 只作异常检查 |
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| DataGrid.GalleryShape | 47.777 | 12479.6 | 1260.0 | 5.0 | smoke 通过；timing 只作异常检查 |
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---
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## 3. 验证
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@@ -585,7 +613,7 @@ dotnet run -c Release -f net10.0 --no-build \
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--verify-datagrid-states
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```
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结果：`DataGrid state verification passed.` 覆盖：无 filter items 不创建 shell、关闭态 filter content lazy、运行时 add/clear filter items 后 indicator 可见性和 flyout shell 同步、realized column header 不再注册本地 hover / press / release / move routed handlers、`HeaderPointerPressed` class handler 转发 exactly once 且 sender 保持为 `DataGridColumn`、realized column group header 不再注册本地 press / release forwarding handlers、group `HeaderPointerPressed` class handler 转发 exactly once 且 sender 保持为 `DataGridColumnGroupItem`、realized row header 不再注册本地 press handler 且左键点击仍选中行并更新 `CurrentSlot`、realized row group header 不再注册本地 press handler 且左键点击仍更新 `CurrentSlot`、realized DataGrid core 不再注册本地 `KeyDown` / `KeyUp` / `GotFocus` / `LostFocus` handlers，且 `GotFocus` 更新 `ContainsFocus`、`Down` key 仍推动 current slot、realized rows presenter 不再注册本地 `ScrollGesture` handler，且滚动手势仍 handled 并更新 `VerticalOffset`、rows presenter clip `RectangleGeometry` 跨重复 arrange 和尺寸变化复用且 `Rect` 会更新、row bottom grid-line clip `RectangleGeometry` 跨重复 arrange 和水平偏移变化复用且 `Rect` 会更新、cell clip `RectangleGeometry` 跨 repeated cells presenter arrange 和水平偏移变化复用且 clipping 取消后清空 `Clip`、details presenter clip `RectangleGeometry` 跨重复 arrange 和水平偏移变化复用且 frozen 模式清空 `Clip`、分组行头内 row header 的 owner/template 顺序不再空引用、DataGridCell 跟随 header sort / reorder state 且 detach 后释放订阅、special columns 在 `Columns.Clear()` 后释放 cached owning grid、column reorder drag indicator 复用 cached render pen 且 foreground 变化后重建、DetailsPresenter `ContentHeight` 改变后触发 measure invalidation、RowExpander checked/details visibility 双向同步和 detach 释放。
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结果：`DataGrid state verification passed.` 覆盖：无 filter items 不创建 shell、关闭态 filter content lazy、运行时 add/clear filter items 后 indicator 可见性和 flyout shell 同步、realized column header 不再注册本地 hover / press / release / move routed handlers、`HeaderPointerPressed` class handler 转发 exactly once 且 sender 保持为 `DataGridColumn`、realized column group header 不再注册本地 press / release forwarding handlers、group `HeaderPointerPressed` class handler 转发 exactly once 且 sender 保持为 `DataGridColumnGroupItem`、realized row header 不再注册本地 press handler 且左键点击仍选中行并更新 `CurrentSlot`、realized row group header 不再注册本地 press handler 且左键点击仍更新 `CurrentSlot`、realized DataGrid core 不再注册本地 `KeyDown` / `KeyUp` / `GotFocus` / `LostFocus` handlers，且 `GotFocus` 更新 `ContainsFocus`、`Down` key 仍推动 current slot、realized rows presenter 不再注册本地 `ScrollGesture` handler，且滚动手势仍 handled 并更新 `VerticalOffset`、rows presenter clip `RectangleGeometry` 跨重复 arrange 和尺寸变化复用且 `Rect` 会更新、row bottom grid-line clip `RectangleGeometry` 跨重复 arrange 和水平偏移变化复用且 `Rect` 会更新、cell clip `RectangleGeometry` 跨 repeated cells presenter arrange 和水平偏移变化复用且 clipping 取消后清空 `Clip`、column header clip `RectangleGeometry` 跨 repeated header presenter arrange 和水平偏移变化复用且 clipping 取消后清空 `Clip`、details presenter clip `RectangleGeometry` 跨重复 arrange 和水平偏移变化复用且 frozen 模式清空 `Clip`、分组行头内 row header 的 owner/template 顺序不再空引用、DataGridCell 跟随 header sort / reorder state 且 detach 后释放订阅、special columns 在 `Columns.Clear()` 后释放 cached owning grid、column reorder drag indicator 复用 cached render pen 且 foreground 变化后重建、DetailsPresenter `ContentHeight` 改变后触发 measure invalidation、RowExpander checked/details visibility 双向同步和 detach 释放。
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```bash
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dotnet run -c Release -f net10.0 --no-build \
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@@ -597,11 +625,11 @@ dotnet run -c Release -f net10.0 --no-build \
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| Scenario | ms/item | KB/item | Visual/root | Logical/root |
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| --- | ---: | ---: | ---: | ---: |
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| DataGrid.Basic | 15.326 | 2964.9 | 305.0 | 1.0 |
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| DataGrid.Filter.Menu.Closed | 10.343 | 2600.7 | 267.0 | 1.0 |
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| DataGrid.Filter.Tree.Closed | 8.870 | 2596.6 | 267.0 | 1.0 |
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| DataGrid.RowHeaders | 10.448 | 3123.2 | 336.0 | 1.0 |
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| DataGrid.RowDetails.Collapsed | 10.622 | 3042.1 | 320.0 | 1.0 |
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| DataGrid.GroupHeaders | 10.193 | 2592.2 | 266.0 | 1.0 |
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| DataGrid.RowGroups | 10.897 | 2998.9 | 321.0 | 1.0 |
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| DataGrid.GalleryShape | 45.449 | 12482.3 | 1260.0 | 5.0 |
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| DataGrid.Basic | 16.045 | 2964.7 | 305.0 | 1.0 |
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| DataGrid.Filter.Menu.Closed | 10.194 | 2599.2 | 267.0 | 1.0 |
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| DataGrid.Filter.Tree.Closed | 9.336 | 2596.4 | 267.0 | 1.0 |
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| DataGrid.RowHeaders | 11.296 | 3122.9 | 336.0 | 1.0 |
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| DataGrid.RowDetails.Collapsed | 11.803 | 3041.9 | 320.0 | 1.0 |
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| DataGrid.GroupHeaders | 9.993 | 2592.3 | 266.0 | 1.0 |
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| DataGrid.RowGroups | 11.546 | 2998.7 | 321.0 | 1.0 |
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| DataGrid.GalleryShape | 47.777 | 12479.6 | 1260.0 | 5.0 |
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@@ -164,7 +164,7 @@ Avalonia 12 控件库研发的成本模型与高频踩雷点（含 `path:line`
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| Data Display | Carousel | Done | [Carousel](Carousel/README.md)；nav/progress/PageTransition 已按需创建，真实 Gallery alloc `6113.86KB -> 5213.10KB`，cold `164.35ms -> 149.05ms`，repeated timing 基本持平 |
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| Data Display | Collapse | Done | [Collapse](Collapse/README.md)；addon、no-arrow、closed content 已按需创建，Gallery repeated mean 提升约 `16.03%` |
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| Data Display | Descriptions | Done | [Descriptions](Descriptions/README.md)；`DescriptionsShowCase` repeated mean `75.84ms -> 68.64ms`，visuals `579 -> 571`；binding/collection/window 订阅生命周期已补齐验证 |
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| Data Display | DataGrid | Partial | [DataGrid](DataGrid/README.md)；filter flyout 内容延迟到首次打开，关闭态过滤菜单项 `7 -> 0`；filter indicator 可见性由 `MultiBinding` 收敛到 `TemplateBinding`；column/group/row header 本地 routed handlers 已收敛（column header hover `2/header -> 0/header`，press/release/move + forwarding `5/header -> 0/header`，group header forwarding `2/header -> 0/header`，row header press `1/header -> 0/header`，row group header press `1/header -> 0/header`）；DataGrid core input handlers `4/grid -> 0/grid`；rows presenter scroll gesture handler `1/presenter -> 0/presenter`；rows presenter clip geometry repeated arrange allocation `1 -> 0` after first；row bottom grid-line clip repeated arrange allocation `1/row -> 0/row` after first；details presenter clip repeated arrange allocation `1/details -> 0/details` after first；cell clip repeated arrange allocation `1/cell -> 0/cell` after first；DataGridCell header-state binding converter 闭包已移除；special columns 在 `Columns.Clear()` 后释放 grid 事件链；列重排拖拽 indicator 复用 dashed `Pen`；DetailsPresenter measure registration 与 RowExpander details binding cleanup 已完成；分组行头内 row header owner/template 顺序空引用已修复 |
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| Data Display | DataGrid | Partial | [DataGrid](DataGrid/README.md)；filter flyout 内容延迟到首次打开，关闭态过滤菜单项 `7 -> 0`；filter indicator 可见性由 `MultiBinding` 收敛到 `TemplateBinding`；column/group/row header 本地 routed handlers 已收敛（column header hover `2/header -> 0/header`，press/release/move + forwarding `5/header -> 0/header`，group header forwarding `2/header -> 0/header`，row header press `1/header -> 0/header`，row group header press `1/header -> 0/header`）；column header clip repeated arrange allocation `1/header -> 0/header` after first；DataGrid core input handlers `4/grid -> 0/grid`；rows presenter scroll gesture handler `1/presenter -> 0/presenter`；rows presenter clip geometry repeated arrange allocation `1 -> 0` after first；row bottom grid-line clip repeated arrange allocation `1/row -> 0/row` after first；details presenter clip repeated arrange allocation `1/details -> 0/details` after first；cell clip repeated arrange allocation `1/cell -> 0/cell` after first；DataGridCell header-state binding converter 闭包已移除；special columns 在 `Columns.Clear()` 后释放 grid 事件链；列重排拖拽 indicator 复用 dashed `Pen`；DetailsPresenter measure registration 与 RowExpander details binding cleanup 已完成；分组行头内 row header owner/template 顺序空引用已修复 |
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| Data Display | Expander | Done | [Expander](Expander/README.md)；closed content/addon/no-arrow slot 已按需创建，Gallery repeated mean 提升约 `18.11%` |
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| Data Display | Empty | Done | [Empty](Empty/README.md)；低风险正确性修复与热路径收敛，Gallery repeated mean 小幅改善，visual tree 不变 |
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| Data Display | GroupBox | Done | [GroupBox](GroupBox/README.md)；header icon presenter 已按需创建，`GroupBoxShowCase` visuals `151 -> 143`，repeated mean `27.79ms -> 26.16ms` |
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@@ -121,7 +121,7 @@
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| 控件 | 状态 | 跨包依赖 |
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| --- | --- | --- |
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| DataGrid | Partial | Primitives.ArrowDecoratedBox, Buttons.Button, TextBlock, Pagination, PopupConfirm, ScrollViewer, Spin, Tooltip.ToolTip, TreeView.TreeViewItemTheme；cell header-state binding / filter flyout lifecycle / filter indicator binding / column/group/row/row group header pointer handler cleanup / core input handler cleanup / rows presenter scroll gesture + clip geometry cleanup / row bottom gridline clip cleanup / details presenter clip cleanup / cell clip cleanup / special column detach lifecycle / column reorder indicator pen cache / details presenter measure registration / row expander details binding 已完成，详见 [DataGrid](DataGrid/README.md) |
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| DataGrid | Partial | Primitives.ArrowDecoratedBox, Buttons.Button, TextBlock, Pagination, PopupConfirm, ScrollViewer, Spin, Tooltip.ToolTip, TreeView.TreeViewItemTheme；cell header-state binding / filter flyout lifecycle / filter indicator binding / column/group/row/row group header pointer handler cleanup / column header clip cleanup / core input handler cleanup / rows presenter scroll gesture + clip geometry cleanup / row bottom gridline clip cleanup / details presenter clip cleanup / cell clip cleanup / special column detach lifecycle / column reorder indicator pen cache / details presenter measure registration / row expander details binding 已完成，详见 [DataGrid](DataGrid/README.md) |
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| DataGridRow / DataGridCell / DataGridColumnHeader 等 ~40 内部子控件 | Pending | 同上 |
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DataGrid 是最重的复合控件，独立子表才是合理的优化粒度。
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@@ -240,7 +240,7 @@ DataGrid 是单文件最复杂的控件之一（~110 个公开类型）。依赖
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| # | 子模块 | 备注 |
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| --- | --- | --- |
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| T4.1 | DataGrid 核心（DataGrid / DataGridRow / DataGridCell / Presenter 系列） | Partial：DataGridCell header sort / reorder state binding converter 闭包已移除，cell clip repeated arrange 分配已收敛；DataGridRowHeader press 本地 handler 已迁到 class handler，且 owner/template 顺序空引用已修复；DataGridRowGroupHeader press 本地 handler 已迁到 class handler；DataGrid core input handlers 已迁到 virtual override；DataGridRowsPresenter scroll gesture handler 已迁到 class handler，presenter clip geometry repeated arrange 分配已收敛；DataGridRow bottom gridline clip repeated arrange 分配已收敛；DataGridDetailsPresenter clip repeated arrange 分配已收敛；DetailsPresenter measure registration 已收敛；DataGrid / DataGridRow / 其他 Presenter / virtualization 仍待专项 |
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| T4.2 | 列模型（DataGridColumn / DataGridColumnHeader / FilterFlyout / SortIndicator） | Partial：filter flyout closed-state 内容已延迟；filter indicator visibility binding 已收敛；column header hover / press / release / move 本地 handler 已清理；column group header press / release forwarding handler 已清理；其余 sort / resize / reorder 仍待专项 |
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| T4.2 | 列模型（DataGridColumn / DataGridColumnHeader / FilterFlyout / SortIndicator） | Partial：filter flyout closed-state 内容已延迟；filter indicator visibility binding 已收敛；column header hover / press / release / move 本地 handler 已清理；column header clip repeated arrange 分配已收敛；column group header press / release forwarding handler 已清理；其余 sort / resize / reorder 仍待专项 |
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| T4.3 | 行展开 / 详情（RowExpander / DetailsPresenter） | Partial：detail / reorder / selection / checkbox / operation columns 的 `Columns.Clear()` detach 事件链已释放；DetailsPresenter `ContentHeight` measure registration 已移到 static constructor；DetailsPresenter clip repeated arrange 分配已收敛且 frozen clear 已验证；RowExpander details visibility binding 已从 `RelayBind` 收敛到 direct observable + detach 释放；其余 row details layout 仍需与 T4.1 协同 |
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| T4.4 | 行重排 / 选择（RowReorder / SelectionColumn） | Partial：column reorder dragging-over indicator 已缓存 dashed `Pen`；拖拽全局订阅仍是 Lifecycle Pairing 重点 |
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| T4.5 | 分组 / 过滤（CollectionView / FilterDescription / GroupDescription） | 数据层成本，不在主题路径上但是真热点 |
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@@ -288,6 +288,7 @@ internal partial class DataGridColumnHeader : ContentControl
|
||||
private bool _areHandlersSuspended;
|
||||
private bool _desiredSeparatorVisibility = true;
|
||||
private INotifyCollectionChanged? _subscribedFilterItems;
|
||||
private RectangleGeometry? _clipGeometry;
|
||||
private static Lazy<Cursor> ResizeCursor = new (() => new Cursor(StandardCursorType.SizeWestEast));
|
||||
|
||||
static DataGridColumnHeader()
|
||||
@@ -329,6 +330,35 @@ internal partial class DataGridColumnHeader : ContentControl
|
||||
SetValueNoCallback(IsSeparatorsVisibleProperty, newVisibility);
|
||||
}
|
||||
}
|
||||
|
||||
internal void UpdateClipGeometry(Rect clipRect)
|
||||
{
|
||||
if (_clipGeometry is null)
|
||||
{
|
||||
_clipGeometry = new RectangleGeometry
|
||||
{
|
||||
Rect = clipRect
|
||||
};
|
||||
}
|
||||
else if (!_clipGeometry.Rect.Equals(clipRect))
|
||||
{
|
||||
_clipGeometry.Rect = clipRect;
|
||||
InvalidateVisual();
|
||||
}
|
||||
|
||||
if (!ReferenceEquals(Clip, _clipGeometry))
|
||||
{
|
||||
Clip = _clipGeometry;
|
||||
}
|
||||
}
|
||||
|
||||
internal void ClearClipGeometry()
|
||||
{
|
||||
if (Clip is not null)
|
||||
{
|
||||
Clip = null;
|
||||
}
|
||||
}
|
||||
|
||||
internal void HandleMouseLeftButtonUpClick(KeyModifiers keyModifiers, ref bool handled)
|
||||
{
|
||||
|
||||
@@ -132,7 +132,7 @@ public sealed class DataGridColumnHeadersPresenter : Panel, IChildIndexProvider
|
||||
if (dataGridColumn.IsLeftFrozen)
|
||||
{
|
||||
columnHeader.Arrange(new Rect(frozenLeftEdge, 0, dataGridColumn.LayoutRoundedWidth, finalSize.Height));
|
||||
columnHeader.Clip = null; // The layout system could have clipped this because it's not aware of our render transform
|
||||
columnHeader.ClearClipGeometry(); // The layout system could have clipped this because it's not aware of our render transform
|
||||
if (DragColumn == dataGridColumn && DragIndicator != null)
|
||||
{
|
||||
dragIndicatorLeftEdge = frozenLeftEdge + DragIndicatorOffset;
|
||||
@@ -174,7 +174,7 @@ public sealed class DataGridColumnHeadersPresenter : Panel, IChildIndexProvider
|
||||
{
|
||||
frozenRightEdge -= dataGridColumn.ActualWidth;
|
||||
columnHeader.Arrange(new Rect(frozenRightEdge, 0, dataGridColumn.LayoutRoundedWidth, finalSize.Height));
|
||||
columnHeader.Clip = null; // The layout system could have clipped this because it's not aware of our render transform
|
||||
columnHeader.ClearClipGeometry(); // The layout system could have clipped this because it's not aware of our render transform
|
||||
columnHeader.IsFrozen = true;
|
||||
columnHeader.FrozenShadowPosition = FrozenColumnShadowPosition.Left;
|
||||
var horizontalScrollBarVisible = OwningGrid.HorizontalScrollBar?.IsVisible ?? false;
|
||||
@@ -241,30 +241,28 @@ public sealed class DataGridColumnHeadersPresenter : Panel, IChildIndexProvider
|
||||
frozenLeftEdge > columnHeaderLeftEdge &&
|
||||
columnHeaderRightEdge > frozenRightEdge)
|
||||
{
|
||||
RectangleGeometry rg = new RectangleGeometry();
|
||||
double xClip = Math.Round(Math.Min(width, frozenLeftEdge - columnHeaderLeftEdge));
|
||||
rg.Rect = new Rect(xClip, 0, Math.Max(0, width - (frozenLeftEdge - columnHeaderLeftEdge) - (columnHeaderRightEdge - frozenRightEdge)), height);
|
||||
columnHeader.Clip = rg;
|
||||
columnHeader.UpdateClipGeometry(new Rect(
|
||||
xClip,
|
||||
0,
|
||||
Math.Max(0, width - (frozenLeftEdge - columnHeaderLeftEdge) - (columnHeaderRightEdge - frozenRightEdge)),
|
||||
height));
|
||||
}
|
||||
else if (columnHeader.OwningColumn != null && !columnHeader.OwningColumn.IsFrozen &&
|
||||
frozenLeftEdge > columnHeaderLeftEdge)
|
||||
{
|
||||
RectangleGeometry rg = new RectangleGeometry();
|
||||
double xClip = Math.Round(Math.Min(width, frozenLeftEdge - columnHeaderLeftEdge));
|
||||
rg.Rect = new Rect(xClip, 0, Math.Max(0, width - xClip), height);
|
||||
columnHeader.Clip = rg;
|
||||
columnHeader.UpdateClipGeometry(new Rect(xClip, 0, Math.Max(0, width - xClip), height));
|
||||
}
|
||||
else if (columnHeader.OwningColumn != null && !columnHeader.OwningColumn.IsFrozen &&
|
||||
columnHeaderRightEdge > frozenRightEdge)
|
||||
{
|
||||
RectangleGeometry rg = new RectangleGeometry();
|
||||
double xClip = Math.Round(Math.Min(width, columnHeaderRightEdge - frozenRightEdge));
|
||||
rg.Rect = new Rect(0, 0, Math.Max(0, width - xClip), height);
|
||||
columnHeader.Clip = rg;
|
||||
columnHeader.UpdateClipGeometry(new Rect(0, 0, Math.Max(0, width - xClip), height));
|
||||
}
|
||||
else
|
||||
{
|
||||
columnHeader.Clip = null;
|
||||
columnHeader.ClearClipGeometry();
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@@ -33,6 +33,7 @@ internal static partial class Program
|
||||
VerifyDataGridRowsPresenterReusesClipGeometry(failures);
|
||||
VerifyDataGridRowReusesBottomGridLineClipGeometry(failures);
|
||||
VerifyDataGridCellsPresenterReusesCellClipGeometry(failures);
|
||||
VerifyDataGridColumnHeadersPresenterReusesHeaderClipGeometry(failures);
|
||||
VerifyDataGridCellHeaderStateBindings(failures);
|
||||
VerifyDataGridSpecialColumnsReleaseGridSubscriptionsOnClear(failures);
|
||||
VerifyDataGridColumnDragIndicatorCachesPen(failures);
|
||||
@@ -645,6 +646,91 @@ internal static partial class Program
|
||||
failures);
|
||||
}
|
||||
|
||||
private static void VerifyDataGridColumnHeadersPresenterReusesHeaderClipGeometry(ICollection<string> failures)
|
||||
{
|
||||
var grid = CreateDataGridShell(8);
|
||||
grid.Width = 260;
|
||||
grid.LeftFrozenColumnCount = 1;
|
||||
grid.RightFrozenColumnCount = 1;
|
||||
var columns = new List<DataGridColumn>();
|
||||
for (var i = 0; i < 6; i++)
|
||||
{
|
||||
var column = new DataGridTextColumn
|
||||
{
|
||||
Header = $"Column {i + 1}",
|
||||
Width = new DataGridLength(120),
|
||||
Binding = new Binding(GetDataGridBindingPath(i))
|
||||
};
|
||||
columns.Add(column);
|
||||
grid.Columns.Add(column);
|
||||
}
|
||||
|
||||
using var realized = RealizeControl(grid);
|
||||
|
||||
Expect(UpdateDataGridHorizontalOffset(grid, 50),
|
||||
"DataGrid should accept a reflected horizontal offset update for column header clip verification.",
|
||||
failures);
|
||||
RefreshLayout(realized.Window);
|
||||
|
||||
var header = GetDataGridColumnHeader(columns[1], failures);
|
||||
if (header is null)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
var firstClip = header.Clip as RectangleGeometry;
|
||||
Expect(firstClip is not null && firstClip.Rect.X > 0,
|
||||
$"DataGrid scrolling column header should be clipped by a RectangleGeometry after horizontal offset. Actual: {header.Clip?.GetType().Name ?? "null"} {firstClip?.Rect}.",
|
||||
failures);
|
||||
if (firstClip is null)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
var firstRect = firstClip.Rect;
|
||||
Expect(firstRect.Height > 0,
|
||||
$"DataGrid scrolling column header clip should have usable bounds. Actual: {firstRect}.",
|
||||
failures);
|
||||
|
||||
foreach (var presenter in GetDataGridColumnHeadersPresenters(grid))
|
||||
{
|
||||
presenter.InvalidateArrange();
|
||||
}
|
||||
RefreshLayout(realized.Window);
|
||||
|
||||
var secondClip = header.Clip as RectangleGeometry;
|
||||
Expect(ReferenceEquals(firstClip, secondClip),
|
||||
"DataGrid column header should reuse its clip RectangleGeometry across repeated header presenter arrange passes.",
|
||||
failures);
|
||||
|
||||
Expect(UpdateDataGridHorizontalOffset(grid, 80),
|
||||
"DataGrid should accept a second horizontal offset update for column header clip verification.",
|
||||
failures);
|
||||
RefreshLayout(realized.Window);
|
||||
|
||||
var scrolledClip = header.Clip as RectangleGeometry;
|
||||
Expect(ReferenceEquals(firstClip, scrolledClip),
|
||||
"DataGrid column header should keep reusing the same clip RectangleGeometry after horizontal offset changes.",
|
||||
failures);
|
||||
Expect(scrolledClip is not null && !scrolledClip.Rect.Equals(firstRect),
|
||||
$"DataGrid reused column header clip geometry should update Rect after horizontal offset changes. Before: {firstRect}, after: {scrolledClip?.Rect}.",
|
||||
failures);
|
||||
|
||||
grid.LeftFrozenColumnCount = 0;
|
||||
grid.RightFrozenColumnCount = 0;
|
||||
grid.Width = 900;
|
||||
UpdateDataGridHorizontalOffset(grid, 0);
|
||||
foreach (var presenter in GetDataGridColumnHeadersPresenters(grid))
|
||||
{
|
||||
presenter.InvalidateArrange();
|
||||
}
|
||||
RefreshLayout(realized.Window);
|
||||
|
||||
Expect(header.Clip is null,
|
||||
"DataGrid column header should clear Clip when frozen-column clipping is no longer needed.",
|
||||
failures);
|
||||
}
|
||||
|
||||
private static void VerifyDataGridCellHeaderStateBindings(ICollection<string> failures)
|
||||
{
|
||||
var grid = CreateDataGridShell(4);
|
||||
@@ -1004,6 +1090,13 @@ internal static partial class Program
|
||||
.ToList();
|
||||
}
|
||||
|
||||
private static List<DataGridColumnHeadersPresenter> GetDataGridColumnHeadersPresenters(Control root)
|
||||
{
|
||||
return root.GetSelfAndVisualDescendants()
|
||||
.OfType<DataGridColumnHeadersPresenter>()
|
||||
.ToList();
|
||||
}
|
||||
|
||||
private static List<DataGridDetailsPresenter> GetDataGridDetailsPresenters(Control root)
|
||||
{
|
||||
return root.GetSelfAndVisualDescendants()
|
||||
|
||||
Reference in New Issue
Block a user