自定义WPF Popup控件
Posted sntetwt
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解决问题
1、WPF Popup 不随着 Window 一起移动的问题
2、WPF Popup 总是显示在最前面
引用命名空间
xmlns:ctrl="clr-namespace:Micro.UI.Controls"
XAML
<ctrl:uiPopup x:Name="canvas" VerticalOffset="-410" IsOpen="True" AllowsTransparency="True" PopupAnimation="Fade"> </ctrl:uiPopup>
C#
using System; using System.Runtime.InteropServices; using System.Windows; using System.Windows.Controls; using System.Windows.Threading; using System.Windows.Interop; using System.Windows.Media; using System.Windows.Controls.Primitives; namespace Micro.UI.Controls public class uiPopup : Popup /// <summary> /// 是否窗口随动,默认为随动(true) /// </summary> public bool IsPositionUpdate get return (bool)GetValue(IsPositionUpdateProperty); set SetValue(IsPositionUpdateProperty, value); public static readonly DependencyProperty IsPositionUpdateProperty = DependencyProperty.Register("IsPositionUpdate", typeof(bool), typeof(uiPopup), new PropertyMetadata(true, new PropertyChangedCallback(IsPositionUpdateChanged))); private static void IsPositionUpdateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) (d as uiPopup).pup_Loaded(d as uiPopup, null); /// <summary> /// 加载窗口随动事件 /// </summary> public uiPopup() this.Loaded += pup_Loaded; /// <summary> /// 加载窗口随动事件 /// </summary> private void pup_Loaded(object sender, RoutedEventArgs e) Popup pup = sender as Popup; var win = VisualTreeHelper.GetParent(pup); while (win != null && (win as Window) == null) win = VisualTreeHelper.GetParent(win); if ((win as Window) != null) (win as Window).LocationChanged -= PositionChanged; (win as Window).SizeChanged -= PositionChanged; if (IsPositionUpdate) (win as Window).LocationChanged += PositionChanged; (win as Window).SizeChanged += PositionChanged; /// <summary> /// 刷新位置 /// </summary> private void PositionChanged(object sender, EventArgs e) try var method = typeof(Popup).GetMethod("UpdatePosition", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance); if (this.IsOpen) method.Invoke(this, null); catch return; //是否最前默认为非最前(false) public static DependencyProperty TopmostProperty = Window.TopmostProperty.AddOwner(typeof(Popup), new FrameworkPropertyMetadata(false, OnTopmostChanged)); public bool Topmost get return (bool)GetValue(TopmostProperty); set SetValue(TopmostProperty, value); private static void OnTopmostChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) (obj as uiPopup).UpdateWindow(); /// <summary> /// 重写拉开方法,置于非最前 /// </summary> /// <param name="e"></param> protected override void OnOpened(EventArgs e) UpdateWindow(); /// <summary> /// 刷新Popup层级 /// </summary> private void UpdateWindow() var hwnd = ((HwndSource)PresentationSource.FromVisual(this.Child)).Handle; RECT rect; if (NativeMethods.GetWindowRect(hwnd, out rect)) NativeMethods.SetWindowPos(hwnd, Topmost ? -1 : -2, rect.Left, rect.Top, (int)this.Width, (int)this.Height, 0); [StructLayout(LayoutKind.Sequential)] public struct RECT public int Left; public int Top; public int Right; public int Bottom; #region P/Invoke imports & definitions public static class NativeMethods [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect); [DllImport("user32", EntryPoint = "SetWindowPos")] internal static extern int SetWindowPos(IntPtr hWnd, int hwndInsertAfter, int x, int y, int cx, int cy, int wFlags); #endregion
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