CODEWITHSUNDEEP
uwpuwp-xaml
Soumya Mahunt
Soumya Mahunt

Reputation: 2792

How to restrict drag-drop action to one app

I am adding storage items to DataPackage when UIElement drag starts, but the problem is if I drag it to other apps or to Windows desktop, Windows interferes with drop action. Is there any way I can restrict the DataPackage to be only read by my app??

Upvotes: 1

Views: 333

Answers (1)

Anran Zhang
Anran Zhang

Reputation: 7727

In UWP, you can write data to DragItemsStartingEventArgs.Data in the DragItemsStarting event. You are writing StorageItem. When dragging to the desktop, the system will call the corresponding default processing method. This behavior is a system behavior, and the UWP application cannot prevent it.

If your purpose is just to drag the tab and create a new window, you don’t need to write data to DataPackage, just let it be processed inside the application, and listen to the DragItemsCompleted event.

private void Tabs_DragItemsStarting(object sender, DragItemsStartingEventArgs e)
{
    //get file
    e.Items.Add(myFile);
}

private void Tabs_DragItemsCompleted(ListViewBase sender, DragItemsCompletedEventArgs args)
{
    var items = args.Items;
    if (items.Count > 0)
    {
        foreach (var item in items)
        {
            if(item is StorageFile file)
            {
                // create new window
            }
        }
    }
}

If the data is written to DataPackage, it means that the party that obtains the data processes the data (such as a desktop or other software), and this process application cannot interfere.

Thanks.

Upvotes: 1

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