WPF ListBox DataTemplate鼠标在里面

Question

I have a ListBox control and some DataTemplates for the ListBox:

<DataTemplate DataType="{x:Type local:LogEntry}" x:Key="lineNumberTemplate">
  <Grid IsSharedSizeScope="True">
    <Grid.ColumnDefinitions>
      <ColumnDefinition SharedSizeGroup="Index" Width="Auto"/>
      <ColumnDefinition/>
    </Grid.ColumnDefinitions>

    <Grid>
      <Rectangle Fill="{Binding Path=LineNumbersBackgroundColor, ElementName=LogViewerProperty}" Opacity="0.4" />
      <TextBlock Grid.Column="0" Margin="5,0,5,0" Style="{StaticResource MyLineNumberText}" x:Name="txtBoxLineNumbers" />
    </Grid>
    <TextBlock Grid.Column="1" Margin="5,0,0,0" Style="{StaticResource MyTextEditor}" />
  </Grid>
</DataTemplate>

<ListBox ItemsSource="{Binding}" x:Name="LogViewer" Background="{Binding Path=TextEditorBackgroundColor, ElementName=LogViewerProperty}" Style="{StaticResource MyListBox}" Foreground="{Binding Path=TextEditorForegroundColor, ElementName=LogViewerProperty}" ItemTemplateSelector="{StaticResource templateSelector}" Loaded="LogViewer_Loaded" SelectionMode="Extended" ItemContainerStyle="{StaticResource LeftAligned}" />

Is it possible when the left mouse button is pressed and the mouse is inside the TextBlock txtBoxLineNumbers to change the ItemContainerStyle in runtime?

All hints are welcome!

Update

Ok, I found a solution:

  var items = (sender as ListBox).SelectedItems;

  foreach (LogEntry item in items)
  {
    ListBoxItem myListBoxItem = (ListBoxItem) (LogViewer.ItemContainerGenerator.ContainerFromItem (item));
    ContentPresenter myContentPresenter = FindVisualChild<ContentPresenter> (myListBoxItem);
    DataTemplate myDataTemplate = myContentPresenter.ContentTemplateSelector.SelectTemplate (myListBoxItem, LogViewer);

    if (!mouseMove && leftMouseButtonDown)
    {
      TextBlock target = (TextBlock) myDataTemplate.FindName ("txtBoxLineNumbers", myContentPresenter);

      if (target.IsMouseOver && leftMouseButtonDown)
      {
        System.Windows.Resources.StreamResourceInfo info = Application.GetResourceStream (new Uri ("/LogViewer;component/Template/RightArrow.cur", UriKind.Relative));
        Cursor = new Cursor (info.Stream);
        fullSelectionBox = true;

        LogViewer.ItemContainerStyle = null;
        break;
      }

      LogViewer.ItemContainerStyle = (Style) FindResource ("LeftAligned");
    }

It seems to work!

Answer 1

Instead of a textblock, you may use a button with control template set to a textblock as below:

                            <Button MouseLeftButtonDown="Button_MouseLeftButtonDown_1">
                            <Button.Template>
                                <ControlTemplate>
                                    <TextBlock Grid.Column="0" Margin="5,0,5,0" Style="{StaticResource MyLineNumberText}" x:Name="txtBoxLineNumbers"/>
                                </ControlTemplate>
                            </Button.Template>
                        </Button>

Then in code behind, you will need:

 private void Button_MouseLeftButtonDown_1(object sender, MouseButtonEventArgs e)
        {
            var textblock = (sender as Button).Template.FindName("txtBoxLineNumbers", (sender as FrameworkElement)) as TextBlock;
            textblock.Text = "Hello World";
        }