DragDropManager get KeyPress during Dragging

[Benedikt]

Hey,

I am using a DragDropManager to drag images from a itemscontrol onto a table.
Now I want to rotate the image, if the user presses the Key "R" during Dragging.

But I dont get it to work.
All Input Bindings on the Window and DataTemplate did not fire.
Does anyone have an idea to achieve what I want?

DragDropManager.AddDragInitializeHandler(icImages, OnDragInitialize);

private void OnDragInitialize(object sender, DragInitializeEventArgs e)
        {
          
            clsImage imageData = (clsImage)((FrameworkElement)e.OriginalSource).DataContext;

            DragDropData dragData = new DragDropData
            {
                ImageData = imageData ,
                Column = Column
            };

            e.Data = dragData;
            e.DragVisual = new ContentControl { ContentTemplate = LayoutRoot.Resources["ImageTemplate"] as DataTemplate, Content = imageData };
            e.AllowedEffects = DragDropEffects.All;

            e.Handled = true;
        }

            <DataTemplate x:Key="ImageTemplate">
                <Grid>
                    <telerik:RadSvgImage
                        UriSource="{Binding file}"
                        HorizontalAlignment="Left"
                        SizeType="ContentToSizeStretch"
                        OverrideColor="{Binding ImageColor}"
                        />
                </Grid>
            </DataTemplate>

[Stenly]

Hello Benedikt,

When a drag operation is undergoing, the DragVisual element is hosted in a native WPF Window element, which when dragged will not raise any keyboard events.

With this in mind, such a behavior can be achieved with a bit of custom code, as well as attaching a global keyboard hook, in order to intercept when a keyboard key is pressed while dragging.

The following StackOverflow's thread contains a code snippet about the global keyboard hook:

Using global keyboard hook (WH_KEYBOARD_LL) in WPF / C# - Stack Overflow

I have attached a test application, which contains the implementation of the above suggestions. 

The produced behavior is as follows:

I hope the provided information and example will be of help to you.

Regards,
Stenly
Progress Telerik

[Benedikt]

Hi Stenly,

great explanation and thank you for your example.
This works great and does exactly what I wanted.

Thank you very much.
Greetings