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

问题

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.

回答1:

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!

回答2:

Use the following after InitializeComponent()

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

回答3:

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;
    }

回答4:

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

来源：https://stackoverflow.com/questions/1130949/wpf-c-disable-drag-drop-for-textboxes

标签

wpf

textbox

drag-and-drop