Question

我在Combobox的数据模板中定义了ItemsControl.此ComboBox中定义了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。

在解释我的问题之前，这是代码：

<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;
}

问题在于，当我点击myCustomView中定义的任何控件时，Popup会失去焦点并关闭。我该怎么强迫它保持开放？

编辑1：

由于myCustomView有自己的ViewModel，我试图通过将Popup属性绑定到视图模型中的布尔值来阻止IsOpen保持打开状态，如下所示：< / p>

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

但焦点开关仍会杀死我的Popup。

Answer 1

您可以将PlacementTarget设置为父ItemsControl，然后设置VerticalOffset的{{1}}和HorizontalOffset属性，以指定其在Popup上的确切位置屏幕，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;
}

Answer 2

您可以将Popup.StaysOpen设置为true，就像这样

<Popup StaysOpen="True"/>

如何防止Popup失去焦点？

2 个答案: