- A+
所属分类：.NET技术
Popup 是一个用于显示临时性内容的控件，它可以在应用程序的其他内容之上显示一个弹出窗口。它通常用于实现下拉菜单、工具提示、通知消息等功能。
主要属性为：
Child：获取或设置 Popup控件的内容。
IsOpen：获取或设置一个值，该值指示Popup 是否可见
Placement:获取或设置 Popup 控件打开时的控件方向，并指定Popup 控件在与屏幕边界重叠时的控件行为
PlacementTarget：获取或设置当打开 Popup 控件时该控件相对于其放置的元素。
PopupAnimation：获取或设置Popup 控件的打开和关闭动画。
StaysOpen：获取或设置一个值，该值指示当 Popup 控件焦点不再对准时，是否关闭该控件。
案例：
PopupBox.xaml
<Popup x:Class="WPF.Common.Dialog.PopupBox" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:WPF.Common.Dialog" mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"> <Grid> <Border x:Name="border" Background="Gray" CornerRadius="8" MinHeight="35" Width="400" Height="100"> <TextBlock TextWrapping="WrapWithOverflow" Foreground="White" Margin="10" FontSize="18" HorizontalAlignment="Center" VerticalAlignment="Center" Text="{Binding Path=Message,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=local:PopupBox},UpdateSourceTrigger=PropertyChanged}"/> </Border> </Grid> </Popup>
PopupBox.xaml.cs
/// <summary> /// PopupBox.xaml 的交互逻辑 /// </summary> public partial class PopupBox : Popup { private static PopupBox dialog = new PopupBox(); private static DispatcherTimer timer = new DispatcherTimer(); public PopupBox() { InitializeComponent(); } /// <summary> /// 弹出对话框 /// </summary> /// <param name="message">消息</param> /// <param name="owner">所属窗体对象</param> /// <param name="seconds">对话框隐藏倒计时（秒）</param> public static void Show(string message, Window owner = null, int seconds = 1) { try { Application.Current.Dispatcher.Invoke(new Action(() => { if (owner == null) { owner = Application.Current.MainWindow; } dialog.Message = message; dialog.PlacementTarget = owner; dialog.Placement = PlacementMode.Center; dialog.StaysOpen = true; dialog.AllowsTransparency = true; dialog.VerticalOffset = owner.ActualHeight / 3; dialog.Opacity = 0.9; dialog.IsOpen = true; timer.Tick -= Timer_Tick; timer.Tick += Timer_Tick; timer.Interval = new TimeSpan(0, 0, seconds); timer.Start(); })); } catch { } } private static void Timer_Tick(object sender, EventArgs e) { timer.Stop(); Task.Run(() => { try { for (int i = 0; i < 100; i++) { Thread.Sleep(5); if (Application.Current == null) return; Application.Current.Dispatcher.Invoke(() => { dialog.Opacity -= 0.01; }); } Application.Current.Dispatcher.Invoke(() => { dialog.IsOpen = false; dialog.Message = string.Empty; }); } catch { } }); } /// <summary> /// 依赖属性--透明度 /// </summary> public new double Opacity { get { return (double)GetValue(OpacityProperty); } set { SetValue(OpacityProperty, value); } } public static new readonly DependencyProperty OpacityProperty = DependencyProperty.Register("Opacity", typeof(double), typeof(PopupBox), new PropertyMetadata(1.0, new PropertyChangedCallback(OnOpacityPropertyChangedCallback))); private static void OnOpacityPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e) { if (!(d is PopupBox box)) return; if (!(e.NewValue is double v)) return; box.border.Opacity = v;//赋值新的透明度 } /// <summary> /// 依赖属性--消息 /// </summary> public string Message { get { return (string)GetValue(MessageProperty); } set { SetValue(MessageProperty, value); } } public static readonly DependencyProperty MessageProperty = DependencyProperty.Register("Message", typeof(string), typeof(PopupBox), new PropertyMetadata(string.Empty)); }
