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Drag-and-drop widget is not not working for Win32 applicaiton in administrative mode

Shyam Butani 190 Reputation points
2024-08-28T06:00:31.62+00:00

Hello,

I'm creating Win32 application with XAML island. I want to allow drag-and-drop of UI element. Below is the code to give an idea of what I'm trying to do. Basically, I want to drag TextBlock and drop on Canvas.

This is working as expected for normal launch, but if I launch in administrative mode, it's crashing when I try to drag the TextBlock.

Can you please help me understand the reason and possible fix to this issue?

TextBlock* tb1, * tb2;
Canvas* z1;
StackPanel* xc;

void DragStarting([[maybe_unused]] UIElement const& pSender, DragStartingEventArgs const& pArgs) noexcept
{
    pArgs.Data().SetText(pSender.try_as<FrameworkElement>().Name());
}

void DragOver(const winrt::Windows::Foundation::IInspectable pSender, DragEventArgs const& pArgs) noexcept
{
    pArgs.AcceptedOperation(DataPackageOperation::Move);
}

void Drop(const winrt::Windows::Foundation::IInspectable pSender, DragEventArgs const& pArgs) noexcept
{
        uint32_t index;

    if (pArgs.DataView().Contains(StandardDataFormats::Text())) {

        if ((*xc).Children().IndexOf(*tb1, index)) {

            (*xc).Children().RemoveAt(index);
            (*z1).Children().Append(*tb1);
        }
    }
}


int CALLBACK WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nCmdShow)
{
    // ... create window and xaml island ...

    // Add UI elements for drag and drop

    Windows::UI::Xaml::Controls::StackPanel xamlContainer;

    Canvas zone;
    Windows::UI::Xaml::Controls::TextBlock textblock;
    Windows::UI::Xaml::Controls::TextBlock textblock1;

    tb1 = &textblock;
    tb2 = &textblock1;
    z1 = &zone;
    xc = &xamlContainer;

    textblock.Text(L"Drag this...");
    textblock.Name(L"textblock");
    textblock.CanDrag(true);
    textblock.DragStarting(DragStarting);

    xamlContainer.Children().Append(textblock);

    textblock1.Text(L"Drop here...");
    textblock.Name(L"textblock1");
    zone.Children().Append(textblock1);
    zone.Margin({ 100, 100, 100, 100 });
    zone.AllowDrop(true);
    zone.DragOver(DragOver);
    zone.Drop(Drop);
    xamlContainer.Children().Append(zone);

    // ... Message loop ...

    return 0;
}

Thanks.

Windows App SDK
Windows App SDK
A set of Microsoft open-source libraries, frameworks, components, and tools to be used in apps to access Windows platform functionality on many versions of Windows. Previously known as Project Reunion.
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