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> Unreal Engine API Reference > Runtime > SlateCore > Widgets > EInvalidateWidgetReason

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EInvalidateWidgetReason

The different types of invalidation that are possible for a widget.

Windows

MacOS

Linux

References

Module	SlateCore
Header	/Engine/Source/Runtime/SlateCore/Public/Widgets/InvalidateWidgetReason.h
Include	#include "Widgets/InvalidateWidgetReason.h"

Syntax

enum EInvalidateWidgetReason
{
    None                   = 0,
    Layout                 = 1 << 0,
    Paint                  = 1 << 1,
    Volatility             = 1 << 2,
    ChildOrder             = 1 << 3,
    RenderTransform        = 1 << 4,
    Visibility             = 1 << 5,
    PaintAndVolatility     = Paint | Volatility,
    LayoutAndVolatility    = Layout | Volatility,
}

Values

Name	Description
None
Layout	Use Layout invalidation if your widget needs to change desired size.
Paint	Use when the painting of widget has been altered, but nothing affecting sizing.
Volatility	Use if just the volatility of the widget has been adjusted.
ChildOrder	A child was added or removed. (this implies layout)
RenderTransform	A Widgets render transform changed
Visibility	Changing visibility (this implies layout)
PaintAndVolatility	Use Paint invalidation if you're changing a normal property involving painting or sizing.
LayoutAndVolatility	Use Layout invalidation if you're changing a normal property involving painting or sizing.

Remarks

The different types of invalidation that are possible for a widget.

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