335 lines
12 KiB
C#
335 lines
12 KiB
C#
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Windows;
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using System.Windows.Interop;
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using System.Windows.Media;
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namespace Wpf.Ui.Extend.Extensions
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{
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public static class VisualExtensions
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{
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/// <summary>
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/// 查找元素的子元素
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/// </summary>
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/// <typeparam name="T">子元素类型</typeparam>
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/// <param name="obj"></param>
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/// <returns></returns>
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public static T FindVisualChild<T>(this DependencyObject obj) where T : DependencyObject
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{
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for (var i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
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{
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var child = VisualTreeHelper.GetChild(obj, i);
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if (child is not null and T)
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return (T)child;
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else
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{
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var childOfChild = FindVisualChild<T>(child);
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if (childOfChild != null)
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return childOfChild;
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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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/// 得到指定元素的集合
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="depObj"></param>
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/// <returns></returns>
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public static IEnumerable<T> FindVisualChildren<T>(this DependencyObject depObj) where T : DependencyObject
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{
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if (depObj != null)
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{
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for (var i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
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{
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var child = VisualTreeHelper.GetChild(depObj, i);
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if (child is not null and T)
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{
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yield return (T)child;
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}
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foreach (var childOfChild in FindVisualChildren<T>(child))
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{
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yield return childOfChild;
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}
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}
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}
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}
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/// <summary>
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/// 获取属性
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/// </summary>
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public static object GetPropertyValue(this object obj, string path)
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{
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if (obj == null) return string.Empty;
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var flag = !string.IsNullOrEmpty(path);
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object result;
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if (flag)
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{
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var property = obj.GetType().GetProperty(path);
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var flag2 = property != null;
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if (flag2)
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{
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try
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{
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result = property.GetValue(obj, null);
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return result;
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}
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catch
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{
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try
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{
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var type = obj.GetType();
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var mInfo = type.GetMethod("get_" + path);
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if (mInfo != null)
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{
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result = mInfo.Invoke(obj, null);
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return result;
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}
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}
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catch { }
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}
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}
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}
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result = obj;
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return result;
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}
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/// <summary>
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/// 利用visualtreehelper寻找对象的子级对象
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="obj"></param>
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/// <returns></returns>
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public static List<T> FindVisualChildrenEx<T>(this DependencyObject obj) where T : DependencyObject
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{
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try
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{
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List<T> TList = [];
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for (var i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
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{
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var child = VisualTreeHelper.GetChild(obj, i);
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if (child is not null and T)
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{
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TList.Add((T)child);
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var childOfChildren = FindVisualChildrenEx<T>(child);
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if (childOfChildren != null)
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{
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TList.AddRange(childOfChildren);
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}
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}
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else
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{
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var childOfChildren = FindVisualChildrenEx<T>(child);
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if (childOfChildren != null)
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{
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TList.AddRange(childOfChildren);
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}
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}
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}
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return TList;
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}
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catch
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{
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return null;
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}
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}
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/// <summary>
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/// 查找元素的父元素
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="i_dp"></param>
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/// <returns></returns>
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public static T FindParent<T>(this DependencyObject i_dp) where T : DependencyObject
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{
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var dobj = (DependencyObject)VisualTreeHelper.GetParent(i_dp);
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if (dobj != null)
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{
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if (dobj is T t)
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{
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return t;
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}
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else
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{
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dobj = FindParent<T>(dobj);
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if (dobj is not null and T)
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{
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return (T)dobj;
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}
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}
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}
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return null;
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}
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public static T FindParent<T>(this DependencyObject i_dp, string elementName) where T : DependencyObject
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{
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var dobj = (DependencyObject)VisualTreeHelper.GetParent(i_dp);
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if (dobj != null)
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{
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if (dobj is T && ((System.Windows.FrameworkElement)(dobj)).Name.Equals(elementName))
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{
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return (T)dobj;
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}
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else
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{
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dobj = FindParent<T>(dobj);
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if (dobj is not null and T)
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{
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return (T)dobj;
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}
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}
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}
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return null;
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}
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public static IntPtr GetHandle(this Visual visual)
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{
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return (PresentationSource.FromVisual(visual) as HwndSource)?.Handle ?? IntPtr.Zero;
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}
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/// <summary>
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/// 查找指定名称的元素
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/// </summary>
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/// <typeparam name="childItem">元素类型</typeparam>
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/// <param name="obj"></param>
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/// <param name="elementName">元素名称，及xaml中的Name</param>
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/// <returns></returns>
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public static childItem FindVisualElement<childItem>(this DependencyObject obj, string elementName) where childItem : DependencyObject
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{
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for (var i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
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{
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var child = VisualTreeHelper.GetChild(obj, i);
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if (child != null && child is childItem && ((System.Windows.FrameworkElement)(child)).Name.Equals(elementName))
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return (childItem)child;
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else
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{
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IEnumerator j = FindVisualChildren<childItem>(child).GetEnumerator();
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while (j.MoveNext())
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{
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var childOfChild = (childItem)j.Current;
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if (childOfChild != null && !(childOfChild as FrameworkElement).Name.Equals(elementName))
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{
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FindVisualElement<childItem>(childOfChild, elementName);
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}
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else
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{
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return childOfChild;
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}
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}
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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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/// 命中测试。根据当前选中元素，查找视觉树父节点与子节点，看是否存在指定类型的元素
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/// </summary>
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/// <typeparam name="T">想命中的元素类型</typeparam>
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/// <param name="dp">当前选中元素</param>
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/// <returns>true：命中成功</returns>
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public static bool HitTest<T>(this DependencyObject dp) where T : DependencyObject
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{
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return FindParent<T>(dp) != null || FindVisualChild<T>(dp) != null;
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}
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public static T FindEqualElement<T>(DependencyObject source, DependencyObject element) where T : DependencyObject
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{
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for (var i = 0; i < VisualTreeHelper.GetChildrenCount(source); i++)
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{
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var child = VisualTreeHelper.GetChild(source, i);
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if (child != null && child is T && child == element)
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{
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return (T)child;
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}
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else
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{
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var childOfChild = FindVisualChild<T>(child);
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if (childOfChild != null)
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{
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return childOfChild;
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}
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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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/// Gets the dependency property according to its name.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="propertyName">Name of the property.</param>
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/// <returns></returns>
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public static DependencyProperty GetDependencyProperty(Type type, string propertyName)
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{
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DependencyProperty prop = null;
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if (type != null)
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{
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var fieldInfo = type.GetField(propertyName + "Property", BindingFlags.Static | BindingFlags.Public);
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if (fieldInfo != null)
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{
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prop = fieldInfo.GetValue(null) as DependencyProperty;
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}
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}
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return prop;
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}
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/// <summary>
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/// Retrieves a <see cref="DependencyProperty"/> using reflection.
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/// </summary>
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/// <param name="o"></param>
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/// <param name="propertyName"></param>
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/// <returns></returns>
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public static DependencyProperty GetDependencyProperty(this DependencyObject o, string propertyName)
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{
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DependencyProperty prop = null;
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if (o != null)
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{
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prop = GetDependencyProperty(o.GetType(), propertyName);
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}
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return prop;
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}
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/// <summary>
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/// 设置 <paramref name="property"/> 只有在没有明确设置的情况下才会使用。
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="o">The object.</param>
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/// <param name="property">The property.</param>
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/// <param name="value">The value.</param>
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/// <returns></returns>
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public static bool SetIfDefault<T>(this DependencyObject o, DependencyProperty property, T value)
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{
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if (o == null) throw new ArgumentNullException("o", "DependencyObject cannot be null");
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if (property == null) throw new ArgumentNullException("property", "DependencyProperty cannot be null");
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if (!property.PropertyType.IsAssignableFrom(typeof(T)))
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{
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throw new ArgumentException(
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string.Format("Expected {0} to be of type {1} but was {2}",
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property.Name, typeof(T).Name, property.PropertyType));
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}
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if (DependencyPropertyHelper.GetValueSource(o, property).BaseValueSource == BaseValueSource.Default)
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{
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o.SetValue(property, value);
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return true;
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}
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return false;
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}
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}
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}
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