Skip to content

Spawn a window at runtime

Spawn a draggable window from game logic instead of placing it in the designer hierarchy.

Example — open settings from a button

flowchart LR
  Btn[Settings button clicked] --> Create[Create Draggable Window]
  Create --> Add[Optional: Add Content Widget]
  Add --> VP[Add to viewport]

Blueprint wiring

On button On Clicked, call Create Draggable Window (Child Widget Class).
Set Window Class to your WBP_DraggableWindow (or subclass).
Set Child Widget Class to the panel you want inside the frame (e.g. settings UI).
Tune Start Size (640×480 is a good default), Center To Screen = true.
Add the returned widget to the viewport (or parent under your HUD root).

Preset parameters

Use case	Start Size	Can Resize	Startup State
Modal dialog	`480×320`	`false`	Default
Full app window	`960×640`	`true`	Default
Tray-style launcher	`320×240`	`true`	Start Minimized

Close handling

Bind On Close Window on your window subclass to play UI sound or refresh HUD state. Call Close Window from a title-bar close button.

// C++ equivalent (minimal)
UDraggableWindow* Window = UDraggableWindow::CreateDraggableWindow(
    this, WindowClass, ChildClass, FVector2D(640.f, 480.f));
if (Window) { Window->AddToViewport(); }

Troubleshooting

Issue	Fix
Window does not drag	Enable Drag = true; WindowTitleBorderWidget bound
Cannot resize	Enable Resizing = true; ResizeAreaWidget bound with Is Variable
Child empty	Pass Child Widget Class or call Add Content Widget after create