Widget Reference

Reference for UDraggableWindow (/Script/DraggableWindowUMG.DraggableWindow). Property names and defaults were read from the plugin (v3.3.4) via Unreal MCP.

Class diagram

Overview

flowchart LR
  Parent["«UserWidget» UUserWidget"]
  Window["«DraggableWindow» UDraggableWindow"]
  Enum["«enum» EOperatingSystemWindowStartupState<br/>Default · StartMinimized · StartMaximized"]

  Parent --> Window
  Window -->|CreateDraggableWindow| Enum

UDraggableWindow members

Properties and Blueprint-callable functions on UDraggableWindow (from plugin v3.3.4):

flowchart TB
  Window["UDraggableWindow<br/>bEnableDrag · bEnableResizing · bEnableMaximizing · ResizeMinWidth · ResizeMaxWidth · ResizeMinHeight · ResizeMaxHeight · DragKey · bIsMaximized<br/>CreateDraggableWindow() · CreateDraggableWindowFromWidget() · AddContentWidget() · AddContentWidgetClass() · GetChildWidget() · UpdateWindowSize() · CenterWindowToScreen() · ToggleMaximize() · CloseWindow() · ApplyWindowStartupState() · OnCloseWindow() · OnDragStart() · OnResizeStart()"]

Blueprint events (On Close Window, On Drag Start, On Resize Start, etc.) are listed in Blueprint events below.

Enums

EOperatingSystemWindowStartupState

Used by Create Draggable Window nodes when spawning at runtime.

Value	Effect
Default	Normal visible window
Start Minimized	Fires On Start Minimized
Start Maximized	Opens maximized (requires resizing enabled)

Properties (class defaults)

Property	Type	Default	Description
Enable Drag	Boolean	`true`	Allow dragging from WindowTitleBorderWidget
Enable Resizing	Boolean	`true`	Allow resize drag from ResizeAreaWidget
Enable Maximizing	Boolean	`true`	Allow Toggle Maximize (requires resizing)
Maximize Taskbar Offset	Float	—	Bottom inset when maximized (taskbar clearance)
Resize Min Width	Float	`640`	Minimum width in pixels
Resize Max Width	Float	`480`	Maximum width in pixels
Resize Min Height	Float	—	Minimum height in pixels
Resize Max Height	Float	—	Maximum height in pixels
Drag Key	Key	Left Mouse Button	Input key for drag / resize
Is Maximized	Boolean	`false`	Runtime state (read-only)

Bind these in your Draggable Window subclass (names are case-sensitive):

Binding name	Widget type	Purpose
WindowTitleBorderWidget	Border	Drag handle + title area
ChildWidgetCanvas	Canvas Panel	Hosts child content
ResizeAreaWidget	Border	Bottom-right resize grip (optional)

Blueprint API

Static — spawn at runtime

Function	Description
Create Draggable Window (Child Widget Class)	Spawns window from class + optional child widget class
Create Draggable Window (Child Widget Reference)	Spawns window and attaches an existing User Widget instance

Common parameters: Start Size, Resize Width (min X, max Y), Resize Height, Center To Screen, Can Drag, Can Resize, Window Startup State.

Instance — content and layout

Function	Description
Add Content Widget	Attach an existing User Widget to ChildWidgetCanvas
Add Content Widget Class	Create and attach a widget from class
Get Child Widget	Returns the active content widget
Update Window Size	Set size in pixels (`FVector2D`)
Center Window To Screen	Re-center (ignored when maximized)
Toggle Maximize	Maximize or restore
Close Window	Removes from parent; fires On Close Window

C++ also exposes SetWindowTitle, SetPosition, and GetWindowPosition.

Blueprint events

Event	When it fires
On Close Window	Window closed via Close Window
On Set Window Title	Title text updated
On Content Widget Added	New child attached
On Drag Start	Drag began (requires Enable Drag)
On Resize Start	Resize began (requires Enable Resizing)
On Start Minimized	Spawned with Start Minimized
On Window Maximize Toggled	Maximize / restore

Content paths

Item	Location
Content root	`DraggableWindowUMG/`
Sample window	`WBP_DraggableWindow`
Demo level	`DemoLevel`
Sample HUD	`WBP_DraggableWindowSampleHUD`

C++ module

Add to your .Build.cs:

PrivateDependencyModuleNames.AddRange(new string[] { "DraggableWindowUMG" });

Include #include "DraggableWindow.h" and call UDraggableWindow::CreateDraggableWindow(...).