SMouseDetector

Overview

SMouseDetector is a compound Slate widget that extends SCompoundWidget. It provides a mechanism for detecting and handling different types of mouse events such as button down, button up, mouse move, double click, drag, hover, and drop. The widget allows users to bind custom event handlers through its constructor arguments.

Properties

Type	Name	Access	Description
`FPointerEventHandler`	OnMouseButtonDown	Public	Handler for mouse button down events.
`FPointerEventHandler`	OnMouseButtonUp	Public	Handler for mouse button up events.
`FPointerEventHandler`	OnMouseMove	Public	Handler for mouse move events.
`FPointerEventHandler`	OnMouseDoubleClick	Public	Handler for mouse double click events.
`FPointerEventHandler`	OnMouseDrag	Public	Handler for mouse drag events.
`FNoReplyPointerEventHandler`	OnMouseHover	Public	Handler for mouse hover events.
`FSimpleNoReplyPointerEventHandler`	OnMouseUnHover	Public	Handler for mouse unhover events.
`FDragDropEventHandler`	OnDragOver	Public	Handler for drag over events.
`FDragDropEventHandler`	OnDrop	Public	Handler for drop events.

Functions

Return Type	Signature	Description
`FReply`	`OnDragDetected(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)`	Handles the detection of a drag event and invokes the bound mouse drag handler if available. Returns `FReply::Unhandled()` otherwise.
`FReply`	`OnDragOver(const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent)`	Handles the detection of a drag over event and invokes the bound drag over handler if available. Returns `FReply::Unhandled()` otherwise.
`FReply`	`OnDrop(const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent)`	Handles the detection of a drop event and invokes the bound drop handler if available. Returns `FReply::Unhandled()` otherwise.

Usage & Implementation Notes

The widget is designed to be used within a Slate UI system.
It requires binding specific mouse event handlers through its constructor arguments.
The widget does not manage memory for the event handlers; they are managed by the user who binds them.

22 May 2026