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Problem assigning event handlers to TasksListControl
#1 Posted : Tuesday, July 16, 2013 11:02:47 AM

Posts: 14


I have run into some trouble with TasksListControl.

I am assigning some events for drag&drop, double click and a contextmenu there. For this I am following the pattern to subscribe to TemplateApplied and then in the LoadingRow-Eventhandler I have:

TasksListControl chartRow = (e.Row as TasksListControl);
chartRow.MouseDoubleClick += new MouseButtonEventHandler(taskbar_MouseDoubleClick);
chartRow.MouseRightButtonDown += new MouseButtonEventHandler(taskbar_MouseRightButtonDown);
chartRow.AllowDrop = true;
chartRow.DragOver += new DragEventHandler(ChartRow_DragOver);
chartRow.Drop += new DragEventHandler(ChartRow_Drop);
ContextMenu cm = new ContextMenu();
MenuItem menuItem = new MenuItem();
menuItem.Header = "Do something";
menuItem.Click += new RoutedEventHandler(MenuItem_Click);
chartRow.SetValue(ContextMenuService.ContextMenuProperty, cm);

But the events never get fired and the context menu never appears.
Unless I also add

chartRow.Background = new SolidColorBrush(Colors.WhiteSmoke);

The color does not matter. The events fire and the context menu appears.

When I reset Background to NULL afterwards all is gone again.

Any ideas?

This is the FlexyGantt XAML:

<gantt:FlexyGantt Name="gantt"
Grid.Row="2" Grid.Column="0" Margin="0,0,0,0"
VerticalAlignment="Stretch" HorizontalAlignment="Stretch"
ItemsSource="{Binding Source={StaticResource RentalAgreementProvider}}"
ItemTemplate="{StaticResource TreeTemplate}"
TaskListBinding="{Binding Bars}"
TaskStartTimeBinding="{Binding StartTime}"
TaskEndTimeBinding="{Binding EndTime}"
CustomSourceListViewTemplate="{StaticResource flexyGanttTableTemplate}"
<Grid Height="18" Margin="0,0,1,0">
<MenuItem Header="Gehe zu..." Click="TaskMenuItem_Click" DataContext="{Binding}" />
<Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
Fill="{Binding Status, Converter={StaticResource BarFillStyleSelector}}"
Stroke="{Binding Status, Converter={StaticResource BarStrokeStyleSelector}}" StrokeThickness="1"
RadiusX="2" RadiusY="2"
<TextBlock Text="{Binding Status}" HorizontalAlignment="Center" VerticalAlignment="Center" FontWeight="Bold" Foreground="Silver" FontSize="10" />
<!--<Rectangle x:Name="taskBar" HorizontalAlignment="Stretch" Fill="{StaticResource TaskItemBarFill}" Stroke="{StaticResource TaskItemBarStroke}" StrokeThickness="1" RadiusX="4" RadiusY="4" />-->
<!-- Include a thumb with name "dragThumb" to enable drag-moving the task functionality.-->
<!-- ZIndex=2 ensures this is drawn above the Rectangle -->
<Thumb x:Name="dragThumb" Canvas.ZIndex="2" Style="{StaticResource TransparentThumb}" />
<!-- Include a thumb with name "resizeThumb" to enable resizing the task functionality -->
<!-- ZIndex=3 ensures this is drawn above the dragThumb -->
<Thumb x:Name="resizeThumb" Canvas.ZIndex="3" HorizontalAlignment="Right" Cursor="SizeWE" Style="{StaticResource TransparentThumb}" Width="3" />
Bala - RadiantQ
#2 Posted : Wednesday, July 17, 2013 7:26:08 AM

Posts: 393

Could you please try to reproduce this issue in ..Samples\FlexyGantt\UserInteraction\AddTaskHereContextMenu sample and send it to us?
#3 Posted : Wednesday, April 23, 2014 3:06:53 AM

Posts: 14


Some time has passed and while the workaround with the background color worked, I came across the same problem.

I took a look at "AddTaskHereContextMenu" where everything works fine.

So I investigated the differences and came up with the following:
DataGrid.xaml populates alternate row coloring and this adds the dropable- and contextmenuable- behaviour! Remove DataGrid.xaml from "AddTaskHereContextMenu" and it no longer works. Adding it to my projects on the other hand makes everything to work like a charm without having to set an "overwrite" color for every row in code.

As I can live with the solution I am not sure if you would like to make DnD and ContextMenu work without that.

Best regards,
Raja - RadiantQ
#4 Posted : Wednesday, April 23, 2014 7:18:34 AM

Posts: 314


Thanks for the update. We will make a note of this and in future add support for this without the DataGrid.xaml.
Thanks & Regards,
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