Method Run

Source/Engine/Platform/SDL/SDLPlatform.Linux.cpp:250–372

[ThreadPoolTask]

        // [ThreadPoolTask]
        bool Run() override
        {
            bool dragWindow = DraggingWindow;

            if (EventQueue == nullptr)
            {
                if (WrappedDataDevice != nullptr)
                    wl_proxy_wrapper_destroy(WrappedDataDevice);
                if (WrappedDataDeviceManager != nullptr)
                    wl_proxy_wrapper_destroy(WrappedDataDeviceManager);
                if (DataDevice != nullptr)
                    wl_data_device_destroy(DataDevice);

                // This seems to throw bogus warnings about wl_data_source still being attached to the queue
                if (EventQueue != nullptr)
                    wl_event_queue_destroy(EventQueue);
                EventQueue = wl_display_create_queue(WaylandDisplay);
                
                WrappedDataDeviceManager = static_cast<wl_data_device_manager*>(wl_proxy_create_wrapper(DataDeviceManager));
                wl_proxy_set_queue(reinterpret_cast<wl_proxy*>(WrappedDataDeviceManager), EventQueue);

                DataDevice = wl_data_device_manager_get_data_device(WrappedDataDeviceManager, Seat);
                wl_data_device_add_listener(DataDevice, &DataDeviceListener, nullptr);
                wl_display_roundtrip(WaylandDisplay);
                wl_data_device_set_user_data(DataDevice, dragWindow ? DragSourceWindow : Window);
                
                WrappedDataDevice = static_cast<wl_data_device*>(wl_proxy_create_wrapper(DataDevice));
                wl_proxy_set_queue(reinterpret_cast<wl_proxy*>(WrappedDataDevice), EventQueue);
            }

            // Offer data for consumption, the data source is destroyed elsewhere
            wl_data_source* dataSource = wl_data_device_manager_create_data_source(WrappedDataDeviceManager);
            wl_data_source* wrappedDataSource = (wl_data_source*)wl_proxy_create_wrapper(dataSource);
            wl_proxy_set_queue(reinterpret_cast<wl_proxy*>(wrappedDataSource), EventQueue);
            if (dragWindow)
            {
                wl_data_source_offer(dataSource, "flaxengine/window");
                wl_data_source_offer(dataSource, "text/plain;charset=utf-8"); // TODO: needs support for custom mime-types in SDL
                wl_data_source_set_actions(dataSource, WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE);
            }
            else
            {
                wl_data_source_offer(dataSource, "text/plain");
                wl_data_source_offer(dataSource, "text/plain;charset=utf-8");
                wl_data_source_set_actions(dataSource, WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE | WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY);
            }
            LinuxDropTextData textData;
            textData.Text = *DraggingData;
            wl_data_source_add_listener(dataSource, &DataSourceListener, &textData);

            // Begin dragging operation
            auto draggedWindow = Window->GetSDLWindow();
            auto dragStartWindow = DragSourceWindow != nullptr ? DragSourceWindow->GetSDLWindow() : draggedWindow;
            wl_surface* originSurface = static_cast<wl_surface*>(SDL_GetPointerProperty(SDL_GetWindowProperties(dragStartWindow), SDL_PROP_WINDOW_WAYLAND_SURFACE_POINTER, nullptr));
            wl_surface* iconSurface = nullptr;
            wl_data_device_start_drag(WrappedDataDevice, dataSource, originSurface, iconSurface, DragSerial);

            Platform::AtomicStore(&StartFlag, 1);