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> Unreal Engine API Reference > Plugins > ModelingComponents > Mechanics > URectangleMarqueeMechanic

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URectangleMarqueeMechanic

Mechanic for a rectangle "marquee" selection.

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Inheritance Hierarchy

UObjectBase

UObjectBaseUtility

UObject

UInteractionMechanic

URectangleMarqueeMechanic

References

Module	ModelingComponents
Header	/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Mechanics/RectangleMarqueeMechanic.h
Include	#include "Mechanics/RectangleMarqueeMechanic.h"

Syntax

UCLASS()
class URectangleMarqueeMechanic :
public UInteractionMechanic,
public IClickDragBehaviorTarget

Remarks

Mechanic for a rectangle "marquee" selection. It creates and maintains the 2D rectangle associated with a mouse drag. It does not test against any scene geometry, nor does it maintain any sort of list of selected objects.

When using this mechanic, you should call Render() on it in the tool's Render() call so that it can cache necessary camera state, and DrawHUD() in the tool's DrawHUD() call so that it can draw the box.

Attach to the mechanic's delegates and use the passed rectangle to test against your geometry.

Variables

	Name	Description
FInputCapturePr...	BasePriority
bool	bUseExternalClickDragBehavior	If true, then the URectangleMarqueeMechanic will not create an internal UClickDragInputBehavior in Setup(), allowing the client to control the marquee with an external InputBehavior that uses the marquee mechanic as it's IClickDragBehaviorTarget.
FCameraRectangl...	CameraRectangle
TObjectPtr< UCl...	ClickDragBehavior
OnDragRectangle...	OnDragRectangleChanged
double	OnDragRectangleChangedDeferredThreshold	If the computation time for a single call to OnDragRectangleChanged ever exceeds this threshold then future calls to this function (in the current drag sequence) will be deferred until the mouse button is released.
OnDragRectangle...	OnDragRectangleFinished
FSimpleMulticas...	OnDragRectangleStarted	Called when user starts dragging a new rectangle.

Functions

	Name	Description
void	DrawHUD ( FCanvas* Canvas, IToolsContextRenderAPI* Render... )
TPair< FInpu...	GetPriorityRange()	Gets the current priority range used by behaviors in the mechanic, higher priority to lower.
bool	IsEnabled()
void	SetBasePriority ( const FInputCapturePriority& Prior... )	Sets the base priority so that users can make sure that their own behaviors are higher priority.
void	SetIsEnabled ( bool bOn )

Overridden from UInteractionMechanic

		Name	Description
	void	Render ( IToolsContextRenderAPI* Render... )	Allow the Mechanic to do any custom drawing (ie via PDI/RHI)
	void	Setup ( UInteractiveTool* ParentTool )	UInteractionMechanic.

Typedefs

Name	Description
OnDragRectangleChangedEvent	Called as the user drags the other corner of the rectangle around.
OnDragRectangleFinishedEvent	Called once the user lets go of the mouse button after dragging out a rectangle.