如何防止 Popup 失去焦点？

Question

我在 ItemsControl. 的数据模板中定义了一个 Combobox 这个 ComboBox 中定义了一个 Button。在 Button_Click 事件中，应显示 Popup。此 Popup 包含自定义 UserControl，其中定义了一些控件。

这是我解释问题之前的代码：

<ComboBox x:Name="cb" HorizontalAlignment="Center" Grid.Column="2" Width="140" Visibility="{Binding HasCombobox, Converter={StaticResource BoolToVis}}">
    <ComboBox.ItemsSource>
       <CompositeCollection>
           <CollectionContainer Collection="{Binding Source={StaticResource cvs}}" />
           <ComboBoxItem>
              <Button Click="Button_Click" Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}" Content="{x:Static prop:Resources.INSERT_BTN}"/>
           </ComboBoxItem>
       </CompositeCollection>
    </ComboBox.ItemsSource>
</ComboBox>

这是 Button_Click 事件：

private void Button_Click(object sender, RoutedEventArgs e)
{
    Button s = sender as Button;
    var popup = new System.Windows.Controls.Primitives.Popup();
    popup.AllowsTransparency = true;
    popup.Child = new myCustomView();
    popup.PlacementTarget = s;
    popup.Placement = System.Windows.Controls.Primitives.PlacementMode.Top;
    popup.IsOpen = true;
    popup.StaysOpen = true;
}

问题是当我单击 myCustomView 中定义的任何控件时，Popup 失去焦点并关闭。我怎样才能强制它保持打开状态？

编辑 1：

因为 myCustomView 有自己的 ViewModel 我试图通过将 IsOpen 属性绑定到像这样查看模型：

popup.DataContext = myCustomViewModel;
Binding b = new Binding();
b.Source = myCustomViewModel;
b.Path = new PropertyPath("stayOpened");
b.Mode = BindingMode.TwoWay;
b.UpdateSourceTrigger = UpdateSourceTrigger.Default;
BindingOperations.SetBinding(popup, Popup.IsOpenProperty, b);
// BindingOperations.SetBinding(popup, Popup.StaysOpenProperty, b);  tried both IsOpened and StaysOpen

但是焦点开关仍然让我很不爽 Popup。

Answer 1

您可以像这样将 Popup.StaysOpen 设置为 true

<Popup StaysOpen="True"/>

Answer 2

您可以将 PlacementTarget 设置为父级 ItemsControl，然后设置 Popup 的 VerticalOffset 和 HorizontalOffset 属性以指定其确切位置在屏幕上，例如：

private void btn_Click(object sender, RoutedEventArgs e)
{
    Button s = sender as Button;
    System.Windows.Controls.Primitives.Popup popup = new System.Windows.Controls.Primitives.Popup();
    popup.AllowsTransparency = true;
    popup.Child = new myCustomView();
    //some stuff needed to recognise which button was pressed
    popup.PlacementTarget = ic; //<-- "ic" is the name of the parent ItemsControl
    Point p = s.TranslatePoint(new Point(0, 0), ic);
    popup.VerticalOffset = p.Y; //adjust this value to fit your requirements
    popup.HorizontalOffset = p.X; //adjust this value to fit your requirements
    popup.IsOpen = true;
    popup.StaysOpen = true;
}

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