int16 FSlateHyperlinkRun::GetBaseLine( float Scale ) const
{
const TSharedRef< FSlateFontMeasure > FontMeasure = FSlateApplication::Get().GetRenderer()->GetFontMeasureService();
return FontMeasure->GetBaseline( Style.TextStyle.Font, Scale ) - FMath::Min(0.0f, Style.TextStyle.ShadowOffset.Y * Scale);
}
int32 FSlateTextUnderlineLineHighlighter::OnPaint(const FPaintArgs& Args, const FTextLayout::FLineView& Line, const float OffsetX, const float Width, const FTextBlockStyle& DefaultStyle, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const
{
TSharedRef<FSlateFontCache> FontCache = FSlateApplication::Get().GetRenderer()->GetFontCache();
const uint16 MaxHeight = FontCache->GetMaxCharacterHeight(FontInfo, AllottedGeometry.Scale);
const int16 Baseline = FontCache->GetBaseline(FontInfo, AllottedGeometry.Scale);
int16 UnderlinePos, UnderlineThickness;
FontCache->GetUnderlineMetrics(FontInfo, AllottedGeometry.Scale, UnderlinePos, UnderlineThickness);
const FVector2D Location(Line.Offset.X + OffsetX, Line.Offset.Y + MaxHeight + Baseline - (UnderlinePos * 0.5f));
const FVector2D Size(Width, FMath::Max<int16>(1, UnderlineThickness));
// The block size and offset values are pre-scaled, so we need to account for that when converting the block offsets into paint geometry
const float InverseScale = Inverse(AllottedGeometry.Scale);
if (Size.X)
{
const FLinearColor LineColorAndOpacity = ColorAndOpacity.GetColor(InWidgetStyle);
const bool ShouldDropShadow = ShadowColorAndOpacity.A > 0.f && ShadowOffset.SizeSquared() > 0.f;
// A negative shadow offset should be applied as a positive offset to the underline to avoid clipping issues
const FVector2D DrawShadowOffset(
(ShadowOffset.X > 0.0f) ? ShadowOffset.X * AllottedGeometry.Scale : 0.0f,
(ShadowOffset.Y > 0.0f) ? ShadowOffset.Y * AllottedGeometry.Scale : 0.0f
);
const FVector2D DrawUnderlineOffset(
(ShadowOffset.X < 0.0f) ? -ShadowOffset.X * AllottedGeometry.Scale : 0.0f,
(ShadowOffset.Y < 0.0f) ? -ShadowOffset.Y * AllottedGeometry.Scale : 0.0f
);
// Draw the optional shadow
if (ShouldDropShadow)
{
FSlateDrawElement::MakeBox(
OutDrawElements,
++LayerId,
AllottedGeometry.ToPaintGeometry(TransformVector(InverseScale, Size), FSlateLayoutTransform(TransformPoint(InverseScale, Location + DrawShadowOffset))),
&UnderlineBrush,
MyClippingRect,
bParentEnabled ? ESlateDrawEffect::None : ESlateDrawEffect::DisabledEffect,
ShadowColorAndOpacity * InWidgetStyle.GetColorAndOpacityTint()
);
}
// Draw underline
FSlateDrawElement::MakeBox(
OutDrawElements,
++LayerId,
AllottedGeometry.ToPaintGeometry(TransformVector(InverseScale, Size), FSlateLayoutTransform(TransformPoint(InverseScale, Location + DrawUnderlineOffset))),
&UnderlineBrush,
MyClippingRect,
bParentEnabled ? ESlateDrawEffect::None : ESlateDrawEffect::DisabledEffect,
LineColorAndOpacity * InWidgetStyle.GetColorAndOpacityTint()
);
}
return LayerId;
}
