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Traverses and manipulates the MewUI visual tree. Use when understanding element hierarchy, finding parent/child elements, implementing IVisualTreeHost, or working with element lifecycle.
默认使用会先检查来源的 Prompt；你也可以切换为直接命令，或下载本地副本。
决定是否安装前，请先阅读 SKILL.md，以及 SkillsMP 当前展示的配套文件。
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
直接命令不会经过审查 Prompt；运行前请先检查来源。
npx skills add https://github.com/christian289/dotnet-with-claudecode --skill navigating-mewui-tree命令会保持在同一行。复制前请横向滚动并检查完整内容。
想先保存到本地？可下载 SkillsMP 当前能够提供的文件。
WPF IValueConverter rules: MarkupExtension singleton, pure functions, null/UnsetValue handling, TemplateBinding.
WPF Freezable performance rules: Freeze() all Brush/Pen/Geometry; create-and-freeze in constructor, reuse in OnRender.
WPF MVVM layer-separation rules: no System.Windows in ViewModels, BCL-only types, CommunityToolkit.Mvvm base classes. Preloaded into MVVM-related wpf-dev-pack agents.
正在显示 SKILL.md
基于 SOC 职业分类
| name | navigating-mewui-tree |
| description | Traverses and manipulates the MewUI visual tree. Use when understanding element hierarchy, finding parent/child elements, implementing IVisualTreeHost, or working with element lifecycle. |
Element (base)
└─ UIElement (input, visibility, focus)
└─ FrameworkElement (sizing, margin, alignment)
├─ Panel (multi-child: StackPanel, Grid, Canvas, DockPanel)
├─ Control (themed elements: Button, Label, TextBox)
│ ├─ ContentControl (single child: Window)
│ └─ Border (decorator)
└─ ...
// Every element has one parent
Element? parent = element.Parent;
// Multi-child (Panel)
panel.Add(child); // Sets child.Parent = panel
panel.Remove(child); // Sets child.Parent = null
panel.Children; // IReadOnlyList<Element>
// Single-child (ContentControl, Border)
contentControl.Content = child; // Element? type, sets child.Parent
border.Child = child; // UIElement? type
// Find visual root (usually Window)
Element? root = element.FindVisualRoot();
// Check ancestry
bool isChild = element.IsDescendantOf(ancestor);
bool isParent = element.IsAncestorOf(descendant); // Also available
// Find ancestor of type
static T? FindAncestor<T>(Element element) where T : Element
{
for (var cur = element.Parent; cur != null; cur = cur.Parent)
if (cur is T match) return match;
return null;
}
Note: VisualTree.Visit() exists but is internal - use FindVisualRoot/IsDescendantOf for external code.
Interface for elements with children (internal API):
internal interface IVisualTreeHost
{
void VisitChildren(Action<Element> visitor);
}
// Panel implementation
void IVisualTreeHost.VisitChildren(Action<Element> visitor)
{
foreach (var child in _children)
visitor(child);
}
// ContentControl implementation
void IVisualTreeHost.VisitChildren(Action<Element> visitor)
{
if (Content != null) visitor(Content);
}
// Called when element joins/leaves tree
protected virtual void OnVisualRootChanged(Element? oldRoot, Element? newRoot)
{
// newRoot == null: removed from tree
// newRoot is Window: added to tree
}
// Transform to ancestor
var transform = element.TransformToAncestor(ancestor);
// Translate point between elements
Point translated = element.TranslatePoint(localPoint, otherElement);
// Mouse position - use MouseEventArgs.Position property
protected override void OnMouseMove(MouseEventArgs e)
{
Point pos = e.Position; // Position relative to this element
}
Hit testing: See hit-testing.md