3.Popup 消息弹出框
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
<<strong>Popup</strong> 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 : <strong>Popup</strong>
{
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));
}
来源:https://www.cnblogs.com/MingQiu/p/18005673
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