WPF + PRISM如何将弹出窗口的所有者作为主窗口

Question

我无法将弹出窗口的所有者设置为应用程序主窗口。

在这里，我做了什么。

1. 创建一个带有自定义PopupWindow的主窗口。

   <Window x:Class="MainWindow" 
       ... 
   
       <Window.Resources> 
        <Style x:Key="MessageWindowStyle" TargetType="{x:Type Window}"> 
         <Setter Property="Background" Value="Transparent" /> 
         <Setter Property="WindowStyle" Value="None" /> 
         <Setter Property="ResizeMode" Value="NoResize" /> 
         <Setter Property="BorderThickness" Value="1" /> 
         <Setter Property="SnapsToDevicePixels" Value="True" /> 
         <Setter Property="ShowInTaskbar" Value="False"/> 
         <Setter Property="AllowsTransparency" Value="True"/> 
        </Style> 
       </Window.Resources> 
   
       <i:Interaction.Triggers> 
        <interactionRequest:InteractionRequestTrigger SourceObject="{Binding MessageRequest, Mode=OneWay}"> 
         <interactionRequest:PopupWindowAction IsModal="True" CenterOverAssociatedObject="True" WindowStyle="{StaticResource MessageWindowStyle}" > 
          <interactionRequest:PopupWindowAction.WindowContent> 
           <controls:PageCustomPopup /> 
          </interactionRequest:PopupWindowAction.WindowContent> 
         </interactionRequest:PopupWindowAction> 
        </interactionRequest:InteractionRequestTrigger> 
       </i:Interaction.Triggers> 
   
       ... 
   </Window> 
   

2. PageCustomPopup.xaml

这是弹出窗口基本XAML。

<UserControl x:Class="PageCustomPopup" 
     ... 
    </UserControl> 

PageCustomPopup.xaml.cs

在该页面代码隐藏，我试图设置父，被装载在弹出窗口时。但它抛出异常。

public partial class PageCustomPopup : UserControl, InteractionRequestAware, INotifyPropertyChanged 
    { 
     public PageCustomPopup() 
     { 
      Loaded += (sender, args) => 
      { 
       try 
       { 
        var parentWindow = this.Parent as Window; 
        if (parentWindow != null) 
        { 
         // This line fails with "Cannot set the Owner after the window is displayed." 
         //parentWindow.Owner = Application.Current.MainWindow; 

         // First, default to the main window's dimensions 
         parentWindow.Width = Application.Current.MainWindow.Width; 
         parentWindow.Height = Application.Current.MainWindow.Height; 
         parentWindow.Left = Application.Current.MainWindow.Left; 
         parentWindow.Top = Application.Current.MainWindow.Top; 
        } 
       } 
      } 
     } 
    } 

主窗口后面的代码。

public InteractionRequest<Notification> MessageRequest { get; private set; } 

public MainWindow() 
{ 
    ... 

    MessageRequest = new InteractionRequest<Notification>(); 

    ... 
} 

void Button_OnClick(object sender, EventArgs e) 
{ 
    MessageRequest.Raise(new Notification(){ Title = "Title Text", Content = "Message to Display"}); 
} 

当显示自定义弹出窗口，它正确地显示在主窗口的中心。

但问题是，当所有的窗口都被最小化时，如果点击任务栏上的应用程序图标，应用程序主窗口将显示出来并显示。无法选择任何东西。

弹出式窗口被隐藏起来，不能放到前面。

将Popup窗口放在前面的唯一方法是使用“Alt + Tab”键。

我的问题是，如何将自定义弹出窗口的所有者设置为Application.Current.MainWindow？ 这样，通过选择任务栏图标或Alt + Tab，显示主窗口和弹出窗口。

Answer 1

在，如果你不希望使用预览版的同时，你可以自己实现从PopupWindowAction得出：

public class PopupChildWindowAction : PopupWindowAction 
{ 
    public static readonly DependencyProperty WindowOwnerProperty = DependencyProperty.Register(
     "WindowOwner", typeof (Window), typeof (PopupChildWindowAction), new PropertyMetadata(default(Window))); 

    public Window WindowOwner 
    { 
     get { return (Window) GetValue(WindowOwnerProperty); } 
     set { SetValue(WindowOwnerProperty, value); } 
    } 

    protected override Window GetWindow(INotification notification) 
    { 
     Window wrapperWindow; 
     if (this.WindowContent != null) 
     { 
      wrapperWindow = this.CreateWindow(); 
      if (wrapperWindow == null) 
       throw new NullReferenceException("CreateWindow cannot return null"); 
      wrapperWindow.Owner = WindowOwner; 
      wrapperWindow.DataContext = (object)notification; 
      wrapperWindow.Title = notification.Title; 
      this.PrepareContentForWindow(notification, wrapperWindow); 
     } 
     else 
      wrapperWindow = this.CreateDefaultWindow(notification); 
     if (this.WindowStyle != null) 
      wrapperWindow.Style = this.WindowStyle; 
     return wrapperWindow; 
    } 
} 

用法：

<i:Interaction.Triggers> 
    <interactionRequest:InteractionRequestTrigger SourceObject="{Binding MessageRequest, Mode=OneWay}"> 
     <local:PopupChildWindowAction IsModal="True" CenterOverAssociatedObject="True" WindowStyle="{StaticResource MessageWindowStyle}" 
             WindowOwner="{Binding ElementName=MyMainWindow}"> 
      <interactionRequest:PopupWindowAction.WindowContent> 
       <local:PageCustomPopup /> 
      </interactionRequest:PopupWindowAction.WindowContent> 
     </local:PopupChildWindowAction> 
    </interactionRequest:InteractionRequestTrigger> 
</i:Interaction.Triggers> 

Answer 2

正如错误所述，您设置的属性太晚了。你在Loaded事件中设置它，所以窗口已经加载。您需要在显示窗口之前设置它。只是你知道，这已经在最新的Prism for WPF预览中得到了修复。

如果你想升级你的NuGets使用最新的预览。以下是修复列表：

https://github.com/PrismLibrary/Prism/wiki/Release-Notes--Jan-10,-2016#prism-for-wpf-611-pre2

Answer 3

刚刚更新@索博尔奇的回答：。实际上，我发现我的PRISM版本中没有一些功能。另外，微不足道的是，我的对话框样式并未保留，所以这段代码解决了我的问题。

protected override Window GetWindow(INotification notification) 
     { 
      Window wrapperWindow; 
      if (this.WindowContent != null) 
      { 
       wrapperWindow = new Window(); 
       if (wrapperWindow == null) 
        throw new NullReferenceException("CreateWindow cannot return null"); 
       wrapperWindow.Owner = WindowOwner; 
       wrapperWindow.DataContext = (object)notification; 
       wrapperWindow.Title = notification.Title; 
       this.PrepareContentForWindow(notification, wrapperWindow); 
      } 
      else 
       wrapperWindow = this.CreateDefaultWindow(notification); 
      return wrapperWindow; 
     } 

下面的一组线没有编制，因为（可能是由于不同版本的PRISM的asselblies的）。所以我用wrapperWindow = new Window（）初始化，并在行为类中的Loaded事件上应用样式，如下所示。

AssociatedObject.Loaded += (sender, e) => 
      { 
       // get the window 
       Window window = Window.GetWindow((UserControl)sender); 
       if (window != null) 
       { 
        window.WindowStyle = WindowStyle.None; 
        window.ResizeMode = ResizeMode.NoResize; 
        window.Background = Brushes.Transparent; 
        window.WindowStartupLocation = WindowStartupLocation.CenterOwner; 
       } 
      }; 

我不得不也改变了XAML一部分，因为我的主要windnow元素名称不可用

<presentBehaviors:PopupChildWindowAction IsModal="False" CenterOverAssociatedObject="True" WindowOwner="{Binding RelativeSource={RelativeSource AncestorType=Window}}">