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59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.
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#include "Designer/SDisappearingBar.h"
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#define LOCTEXT_NAMESPACE "UMG"
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/////////////////////////////////////////////////////
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// SDisappearingBar
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void SDisappearingBar::Construct(const FArguments& InArgs)
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{
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FadeCurve = FCurveSequence(0, 0.25f);
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ColorAndOpacity = TAttribute<FLinearColor>::Create(TAttribute<FLinearColor>::FGetter::CreateSP(this, &SDisappearingBar::GetFadeColorAndOpacity));
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ChildSlot
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[
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InArgs._Content.Widget
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];
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}
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void SDisappearingBar::OnDragEnter( const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent )
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{
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if ( !FadeCurve.IsAtEnd() )
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{
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// Play the curve forward to fade the bar out
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if ( FadeCurve.IsInReverse() && FadeCurve.IsPlaying() )
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{
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FadeCurve.Reverse();
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}
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else if ( !FadeCurve.IsPlaying() )
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{
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FadeCurve.Play( this->AsShared() );
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}
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}
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}
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void SDisappearingBar::OnDragLeave( const FDragDropEvent& DragDropEvent )
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{
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if ( !FadeCurve.IsAtStart() )
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{
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// Play the curve in reverse to fade the bar back in
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if ( !FadeCurve.IsInReverse() && FadeCurve.IsPlaying() )
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{
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FadeCurve.Reverse();
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}
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else if ( !FadeCurve.IsPlaying() )
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{
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FadeCurve.PlayReverse( this->AsShared() );
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}
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}
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}
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FLinearColor SDisappearingBar::GetFadeColorAndOpacity() const
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{
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return FLinearColor(1, 1, 1, 1 - FadeCurve.GetLerp());
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}
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#undef LOCTEXT_NAMESPACE
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