WPF/C#: Disable Drag & Drop for TextBoxes?

Question

Does anyone have an idea how I can disable Drag & Drop for all my TextBox Elements? I found something here, but that would need me to run a loop for all Elements.

Answer 1

Use the following after InitializeComponent()

DataObject.AddCopyingHandler(textboxName, (sender, e) => { if (e.IsDragDrop) e.CancelCommand(); });

Answer 2

You can easily wrap what this article describes into a attached property/behaviours...

ie. TextBoxManager.AllowDrag="False" (For more information check out these 2 CodeProject articles - Drag and Drop Sample and Glass Effect Samplelink text)

Or try out the new Blend SDK's Behaviors

UPDATE

• Also read this article by Bill Kempf about attached behaviors
• And as kek444 pointed out in the comments, you then just create a default style for textbxo whit this attached property set!

Answer 3

Personally I created a custom TextBox control that does not allow drag as follows:

/// <summary>
/// Represents a <see cref="TextBox"/> control that does not allow drag on its contents.
/// </summary>
public class NoDragTextBox:TextBox
{
    /// <summary>
    /// Initializes a new instance of the <see cref="NoDragTextBox"/> class.
    /// </summary>
    public NoDragTextBox()
    {
        DataObject.AddCopyingHandler(this, NoDragCopyingHandler);
    }

    private void NoDragCopyingHandler(object sender, DataObjectCopyingEventArgs e)
    {
        if (e.IsDragDrop)
        {
            e.CancelCommand();
        }
    }
}

Instead of using TextBox use local:NoDragTextBox where "local" being the alias to the location of the NoDragTextBox assembly. The same above logic also can be extended to prevent Copy/Paste on TextBox .

For more info check the reference to the above code at http://jigneshon.blogspot.be/2013/10/c-wpf-snippet-disabling-dragging-from.html

Answer 4

Create your owner user control ex MyTextBox: TextBox and override:

    protected override void OnDragEnter(DragEventArgs e)
    {
        e.Handled = true;
    }

    protected override void OnDrop(DragEventArgs e)
    {
        e.Handled = true;
    }


    protected override void OnDragOver(DragEventArgs e)
    {
        e.Handled = true;
    }