91 lines
3.5 KiB
C#
91 lines
3.5 KiB
C#
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using System.Collections.Generic;
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using System.Linq;
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using System.Windows;
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using System.Windows.Media;
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namespace DMS.WPF.Helper
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{
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public static class VisualTreeFinder
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{
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/// <summary>
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/// (按名称查找) 在可视化树中查找指定名称的特定类型 T 的子元素。
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/// </summary>
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/// <typeparam name="T">要查找的元素的类型，必须是 FrameworkElement。</typeparam>
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/// <param name="parent">要开始查找的父元素。</param>
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/// <param name="name">要查找的元素的 Name 属性。</param>
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/// <returns>找到的第一个匹配的元素，如果未找到则返回 null。</returns>
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public static T FindVisualChildByName<T>(DependencyObject parent, string name) where T : FrameworkElement
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{
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if (parent == null || string.IsNullOrEmpty(name))
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return null;
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int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
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for (int i = 0; i < childrenCount; i++)
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{
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var child = VisualTreeHelper.GetChild(parent, i);
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// 检查当前子元素是否是我们要找的目标
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if (child is T frameworkElement && frameworkElement.Name == name)
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{
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return frameworkElement;
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}
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// 如果不是，则递归进入子元素的子级中查找
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var result = FindVisualChildByName<T>(child, name);
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if (result != null)
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{
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// 如果在子级中找到了，立即返回结果，停止继续搜索
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return result;
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}
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}
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return null;
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}
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/// <summary>
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/// (非泛型) 查找指定元素的所有可视化子元素。
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/// </summary>
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/// <param name="parent">要开始查找的父元素。</param>
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/// <returns>一个包含所有找到的子元素的 IEnumerable<DependencyObject> 集合。</returns>
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public static IEnumerable<DependencyObject> FindAllVisualChildren(DependencyObject parent)
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{
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if (parent == null)
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yield break;
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int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
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for (int i = 0; i < childrenCount; i++)
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{
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DependencyObject child = VisualTreeHelper.GetChild(parent, i);
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// 先返回直接子元素
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yield return child;
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// 然后递归查找并返回其所有子元素
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foreach (DependencyObject nestedChild in FindAllVisualChildren(child))
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{
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yield return nestedChild;
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}
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}
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}
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/// <summary>
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/// (泛型) 查找指定元素的可视化子元素中所有符合条件的特定类型 T 的元素。
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/// </summary>
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/// <typeparam name="T">要查找的子元素的类型，必须是 DependencyObject。</typeparam>
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/// <param name="parent">要开始查找的父元素。</param>
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/// <returns>一个包含所有找到的子元素的 IEnumerable<T> 集合。</returns>
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public static IEnumerable<T> FindVisualChildren<T>(DependencyObject parent) where T : DependencyObject
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{
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// 复用 FindAllVisualChildren 的逻辑，避免代码重复
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foreach (var child in FindAllVisualChildren(parent))
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{
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if (child is T typedChild)
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{
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yield return typedChild;
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}
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}
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}
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}
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}
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