Question

我对WPF很新，并且仍然试图弄清楚它的所有细节;）我有一个奇怪的问题，按钮没有提高其点击事件。我有一个名为PopupButton的UserControl，它基本上是一个点击弹出窗口的按钮。弹出窗口的内容是ContentPresenter，并绑定到PopupButton上名为PopupContentHolder的依赖项属性。然后在主窗体上我有一个DataGrid和DataGridTemplateColumn，在<DataGridTemplateColumn.CellTemplate> <DataTemplate>我放置了我的PopupButton。然后我指定一个带有ItemTemplate的列表框作为我的PopupButton弹出窗口的内容。简单来说，这看起来如下

<DataGrid HorizontalAlignment="Stretch"
        VerticalAlignment="Stretch"
        HorizontalContentAlignment="Stretch"
        ColumnHeaderHeight="40"
        FontSize="11"
        HorizontalScrollBarVisibility="Disabled"
        ItemsSource="{Binding Pocos}"
        RowHeight="30"
        SnapsToDevicePixels="True"
        VerticalScrollBarVisibility="Disabled">
<DataGrid.Columns>
    <DataGridTemplateColumn MinWidth="70" Header="NAme">
        <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
                <controls:PopupButton DoPopupOnMainButton="True"
                                        Foreground="{StaticResource HeaderLinkActiveColor}"
                                        MarkButtonOnPopup="True"
                                        PopupBackground="{StaticResource PopupBackground}"
                                        PopupPadding="5"
                                        ShowDownArrow="False"
                                        Text="Some test button">
                    <controls:PopupButton.PopupContentHolder>
                        <StackPanel>
                            <ListBox Background="Transparent" ItemsSource="{Binding Tenders}">
                                <ListBox.ItemTemplate>
                                    <DataTemplate>
                                        <Button Margin="0,2,0,0"
                                                Click="Button_Click"
                                                Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}},
                                                                    Path=DataContext.SaveCommand}"
                                                Content="{Binding .}"
                                                FontSize="11" />
                                    </DataTemplate>
                                </ListBox.ItemTemplate>
                            </ListBox>
                        </StackPanel>
                    </controls:PopupButton.PopupContentHolder>
                </controls:PopupButton>
            </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
</DataGrid.Columns>

现在问题出在PopupButton中ListBox内的按钮，既没有引发Click事件也没有引发Command。此外，当我将PopupButton放在DataGrid之外时，everythinkg工作得很完美。此外，当我将上面的列表框直接放在网格单元格中然后它工作。也许我的PopupButtonControl有问题。

<UserControl x:Class="WpfApplication1.PopupButton"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         x:Name="userControlRoot"
         Width="Auto"
         Height="Auto">
<UserControl.Resources>
    <BooleanToVisibilityConverter x:Key="BoolToVis" />

    <Storyboard x:Key="PopupCloseStoryBoard">
        <BooleanAnimationUsingKeyFrames Storyboard.TargetName="popup" Storyboard.TargetProperty="IsOpen">
            <DiscreteBooleanKeyFrame KeyTime="0:0:0.1" Value="False" />
        </BooleanAnimationUsingKeyFrames>
    </Storyboard>

    <Storyboard x:Key="PopupOpenStoryBoard">
        <BooleanAnimationUsingKeyFrames Storyboard.TargetName="popup" Storyboard.TargetProperty="IsOpen">
            <DiscreteBooleanKeyFrame KeyTime="0:0:0.0" Value="True" />
        </BooleanAnimationUsingKeyFrames>
    </Storyboard>


</UserControl.Resources>

<Grid>

    <Border x:Name="brdButtonBack"
            Background="Transparent"
            CornerRadius="3,3,0,0"
            Padding="{Binding Padding,
                              ElementName=userControlRoot}" />

    <Button x:Name="btnMain"
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Click="btn_Click"
            Command="{Binding MainCommand,
                              ElementName=userControlRoot}"
            Content="{Binding Text,
                              ElementName=userControlRoot}"
            IsEnabled="{Binding IsEnabled,
                                ElementName=userControlRoot}" />

    <Popup x:Name="popup"
           MinWidth="{Binding ActualWidth,
                              ElementName=userControlRoot}"
           AllowsTransparency="True"
           Placement="Bottom"
           PlacementTarget="{Binding ElementName=brdButtonBack}"
           PopupAnimation="Slide"
           StaysOpen="False">
        <Border Background="{Binding PopupBackground,
                                     ElementName=userControlRoot}"
                BorderBrush="White"
                CornerRadius="0,3,3,3"
                Padding="{Binding PopupPadding,
                                  ElementName=userControlRoot}">

            <ContentPresenter Content="{Binding PopupContentHolder, ElementName=userControlRoot}" />
        </Border>
    </Popup>

</Grid>

我已经简化了控制，但问题也随着该版本重现。控件的代码主要包含依赖属性，唯一的逻辑如下所示

public partial class PopupButton : UserControl
{
    //... dependency properties

    public PopupButton()
    {
        InitializeComponent();
    }

    private void btn_Click(object sender, RoutedEventArgs e)
    {
            Storyboard s = (Storyboard)TryFindResource("PopupOpenStoryBoard");
            s.Begin();
    }

    private void popup_PreviewMouseDown(object sender, MouseButtonEventArgs e)
    {
        //trick to close popup when the button inside is clicked
        //this must be done with storyboard and delay
        //since popup can not be closed before the event reaches clicked
        //button
        if (e.Source is Button)
        {
            Storyboard s = (Storyboard)TryFindResource("PopupCloseStoryBoard");
            s.Begin();
        }
    }
}

有没有人知道它有什么问题？感谢。

Answer 1

我最后通过将PopupButton重写为CustomControl来解决这个问题。在那里，而不是触发StoryBoard来关闭弹出窗口，当单击包含的按钮时，我使用了以下代码

mainPopup.AddHandler(Button.ClickEvent, new RoutedEventHandler(mainPopup_ButtonClick), true);

为主弹出添加按钮单击处理程序，即使事件已由源按钮处理，也会在弹出窗口中调用。

    void mainPopup_ButtonClick(object sender, RoutedEventArgs e)
    {
        MainPopup.IsOpen = false;
    }

有关处理已处理的路由事件here

的详细信息

Answer 2

也许这只是一个错字，因为代码中有一个btn_Click和Button_Click事件处理程序。你介意提供PopupContentHolder的代码还是整个PopupButton类？

在datagrid上弹出的Button不会引发Click事件

2 个答案: