FGeometry ComputeMenuPlacement(const FGeometry& AllottedGeometry, const FVector2D& PopupDesiredSize, EMenuPlacement PlacementMode)
{
// Compute the popup size, offset, and anchor rect in local space
const FPopupPlacement Placement(AllottedGeometry, PopupDesiredSize, PlacementMode);
// ask the application to compute the proper desktop offset for the anchor. This requires the offsets to be in desktop space.
const FVector2D NewPositionDesktopSpace = FSlateApplication::Get().CalculatePopupWindowPosition(
TransformRect(AllottedGeometry.GetAccumulatedLayoutTransform(), Placement.AnchorLocalSpace),
TransformVector(AllottedGeometry.GetAccumulatedLayoutTransform(), Placement.LocalPopupSize),
Placement.Orientation);
// transform the desktop offset into local space and use that as the layout transform for the child content.
return AllottedGeometry.MakeChild(
Placement.LocalPopupSize,
FSlateLayoutTransform(TransformPoint(Inverse(AllottedGeometry.GetAccumulatedLayoutTransform()), NewPositionDesktopSpace)));
}
void SInvalidationPanel::Tick( const FGeometry& AllottedGeometry, const double InCurrentTime, const float InDeltaTime )
{
if ( GetCanCache() )
{
const bool bWasCachingNeeded = bNeedsCaching;
if ( bNeedsCaching == false )
{
if ( bCacheRelativeTransforms )
{
// If the container we're in has changed in either scale or the rotation matrix has changed,
if ( AllottedGeometry.GetAccumulatedLayoutTransform().GetScale() != LastAllottedGeometry.GetAccumulatedLayoutTransform().GetScale() ||
AllottedGeometry.GetAccumulatedRenderTransform().GetMatrix() != LastAllottedGeometry.GetAccumulatedRenderTransform().GetMatrix() )
{
InvalidateCache();
}
}
else
{
// If the container we're in has changed in any way we need to invalidate for sure.
if ( AllottedGeometry.GetAccumulatedLayoutTransform() != LastAllottedGeometry.GetAccumulatedLayoutTransform() ||
AllottedGeometry.GetAccumulatedRenderTransform() != LastAllottedGeometry.GetAccumulatedRenderTransform() )
{
InvalidateCache();
}
}
if ( AllottedGeometry.GetLocalSize() != LastAllottedGeometry.GetLocalSize() )
{
InvalidateCache();
}
}
LastAllottedGeometry = AllottedGeometry;
// TODO We may be double pre-passing here, if the invalidation happened at the end of last frame,
// we'll have already done one pre-pass before getting here.
if ( bNeedsCaching )
{
SlatePrepass(AllottedGeometry.Scale);
CachePrepass(SharedThis(this));
}
}
}
FGeometry SMenuAnchor::ComputeMenuPlacement( const FGeometry& AllottedGeometry, const FVector2D& PopupDesiredSize, EMenuPlacement PlacementMode )
{
// Compute the popup size, offset, and anchor rect in local space
const FVector2D PopupSizeLocalSpace = (PlacementMode == MenuPlacement_ComboBox || PlacementMode == MenuPlacement_ComboBoxRight)
? FVector2D( FMath::Max( AllottedGeometry.Size.X, PopupDesiredSize.X ), PopupDesiredSize.Y )
: PopupDesiredSize;
const FVector2D OffsetLocalSpace = GetMenuOffsetForPlacement(AllottedGeometry, PlacementMode, PopupSizeLocalSpace);
const FSlateRect AnchorLocalSpace = FSlateRect::FromPointAndExtent(OffsetLocalSpace, AllottedGeometry.Size);
const EOrientation Orientation = (PlacementMode == MenuPlacement_MenuRight || PlacementMode == MenuPlacement_MenuLeft) ? Orient_Horizontal : Orient_Vertical;
// ask the application to compute the proper desktop offset for the anchor. This requires the offsets to be in desktop space.
const FVector2D NewPositionDesktopSpace = FSlateApplication::Get().CalculatePopupWindowPosition(
TransformRect(AllottedGeometry.GetAccumulatedLayoutTransform(), AnchorLocalSpace),
TransformVector(AllottedGeometry.GetAccumulatedLayoutTransform(), PopupSizeLocalSpace),
Orientation );
// transform the desktop offset into local space and use that as the layout transform for the child content.
return AllottedGeometry.MakeChild(
PopupSizeLocalSpace,
FSlateLayoutTransform(TransformPoint(Inverse(AllottedGeometry.GetAccumulatedLayoutTransform()), NewPositionDesktopSpace)));
}
void SMenuAnchor::Tick( const FGeometry& AllottedGeometry, const double InCurrentTime, const float InDeltaTime )
{
TSharedPtr<SWindow> PopupWindow = PopupWindowPtr.Pin();
if ( PopupWindow.IsValid() && IsOpenViaCreatedWindow() )
{
// Figure out where our attached pop-up window should be placed.
const FVector2D PopupContentDesiredSize = PopupWindow->GetContent()->GetDesiredSize();
FGeometry PopupGeometry = ComputeMenuPlacement( AllottedGeometry, PopupContentDesiredSize, Placement.Get() );
const FVector2D NewPosition = PopupGeometry.LocalToAbsolute(FVector2D::ZeroVector);
// For the CreateWindow case, don't transform the size; it will always use the ApplicationScale
const FVector2D NewSize = PopupGeometry.GetLocalSize();
const FSlateRect NewShape = FSlateRect( NewPosition.X, NewPosition.Y, NewPosition.X + NewSize.X, NewPosition.Y + NewSize.Y );
// We made a window for showing the popup.
// Update the window's position!
if (false /*PopupWindow->IsMorphing()*/ )
{
if( NewShape != PopupWindow->GetMorphTargetShape() )
{
// Update the target shape
PopupWindow->UpdateMorphTargetShape( NewShape );
// Set size immediately if not morphing size
if(!PopupWindow->IsMorphingSize())
{
PopupWindow->ReshapeWindow( PopupWindow->GetPositionInScreen(), NewSize );
}
}
}
else
{
const FVector2D WindowPosition = PopupWindow->GetPositionInScreen();
const FVector2D WindowSize = PopupWindow->GetSizeInScreen();
if ( NewPosition != WindowPosition || NewSize != WindowSize )
{
#if PLATFORM_LINUX
// @FIXME: for some reason, popups reshaped here do not trigger OnWindowMoved() callback,
// so we manually set cached position to where we expect it to be. Note the order of operations - (before Reshape) -
// still giving the callback a chance to change it.
// This needs to be investigated (tracked as TTP #347674).
PopupWindow->SetCachedScreenPosition( NewPosition );
#endif // PLATFORM_LINUX
PopupWindow->ReshapeWindow( NewShape );
}
}
}
else if (PopupWindow.IsValid() && IsOpenAndReusingWindow())
{
// Ideally, do this in OnArrangeChildren(); currently not possible because OnArrangeChildren()
// can be called in DesktopSpace or WindowSpace, and we will not know which version of the Window
// geometry to use. Tick() is always in DesktopSpace, so cache the solution here and just use
// it in OnArrangeChildren().
const FPopupPlacement LocalPlacement(AllottedGeometry, Children[1].GetWidget()->GetDesiredSize(), Placement.Get());
const FSlateRect WindowRectLocalSpace = TransformRect(Inverse(AllottedGeometry.GetAccumulatedLayoutTransform()), PopupWindow->GetClientRectInScreen());
const FVector2D FittedPlacement = ComputePopupFitInRect(
LocalPlacement.AnchorLocalSpace,
FSlateRect(LocalPlacement.LocalPopupOffset, LocalPlacement.LocalPopupOffset + LocalPlacement.LocalPopupSize),
LocalPlacement.Orientation, WindowRectLocalSpace);
LocalPopupPosition = FittedPlacement;
ScreenPopupPosition = AllottedGeometry.GetAccumulatedLayoutTransform().TransformPoint(LocalPopupPosition);
}
/** The tick is ending, so the window was not dismissed this tick. */
bDismissedThisTick = false;
}
/** SWidget interface */
virtual int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const override
{
// First paint the background
{
LayerId = PaintBackground(AllottedGeometry, MyClippingRect, OutDrawElements, LayerId);
LayerId++;
}
FArrangedChildren ArrangedChildren(EVisibility::Visible);
ArrangeChildren(AllottedGeometry, ArrangedChildren);
// Draw the child nodes
// When drawing a marquee, need a preview of what the selection will be.
const auto* SelectionToVisualize = &(SelectionManager.SelectedNodes);
FGraphPanelSelectionSet SelectionPreview;
if (Marquee.IsValid())
{
ApplyMarqueeSelection(Marquee, SelectionManager.SelectedNodes, SelectionPreview);
SelectionToVisualize = &SelectionPreview;
}
int32 NodesLayerId = LayerId;
for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
{
FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
TSharedRef<SWorldTileItem> ChildNode = StaticCastSharedRef<SWorldTileItem>(CurWidget.Widget);
ChildNode->bAffectedByMarquee = SelectionToVisualize->Contains(ChildNode->GetObjectBeingDisplayed());
LayerId = CurWidget.Widget->Paint(Args.WithNewParent(this), CurWidget.Geometry, MyClippingRect, OutDrawElements, NodesLayerId, InWidgetStyle, ShouldBeEnabled(bParentEnabled));
ChildNode->bAffectedByMarquee = false;
}
// Draw editable world bounds
if (!WorldModel->IsSimulating())
{
float ScreenSpaceSize = FLevelCollectionModel::EditableAxisLength()*GetZoomAmount()*2.f;
FVector2D PaintSize = FVector2D(ScreenSpaceSize, ScreenSpaceSize);
FVector2D PaintPosition = GraphCoordToPanelCoord(FVector2D::ZeroVector) - (PaintSize*0.5f);
float Scale = 0.2f; // Scale down drawing border
FSlateLayoutTransform LayoutTransform(Scale, AllottedGeometry.GetAccumulatedLayoutTransform().GetTranslation() + PaintPosition);
FSlateRenderTransform RenderTransform(Scale, AllottedGeometry.GetAccumulatedRenderTransform().GetTranslation() + PaintPosition);
FPaintGeometry EditableArea(LayoutTransform, RenderTransform, PaintSize/Scale);
FLinearColor PaintColor = FLinearColor::Yellow;
PaintColor.A = 0.4f;
FSlateDrawElement::MakeBox(
OutDrawElements,
++LayerId,
EditableArea,
FEditorStyle::GetBrush(TEXT("Graph.CompactNode.ShadowSelected")),
MyClippingRect,
ESlateDrawEffect::None,
PaintColor
);
}
// Draw the marquee selection rectangle
PaintMarquee(AllottedGeometry, MyClippingRect, OutDrawElements, ++LayerId);
// Draw the software cursor
PaintSoftwareCursor(AllottedGeometry, MyClippingRect, OutDrawElements, ++LayerId);
if(WorldModel->IsSimulating())
{
// Draw a surrounding indicator when PIE is active, to make it clear that the graph is read-only, etc...
FSlateDrawElement::MakeBox(
OutDrawElements,
LayerId,
AllottedGeometry.ToPaintGeometry(),
FEditorStyle::GetBrush(TEXT("Graph.PlayInEditor")),
MyClippingRect
);
}
// Draw observer location
{
FVector ObserverPosition;
FRotator ObserverRotation;
if (WorldModel->GetObserverView(ObserverPosition, ObserverRotation))
{
FVector2D ObserverPositionScreen = GraphCoordToPanelCoord(FVector2D(ObserverPosition.X, ObserverPosition.Y));
const FSlateBrush* CameraImage = FEditorStyle::GetBrush(TEXT("WorldBrowser.SimulationViewPositon"));
FPaintGeometry PaintGeometry = AllottedGeometry.ToPaintGeometry(
ObserverPositionScreen - CameraImage->ImageSize*0.5f,
CameraImage->ImageSize
);
FSlateDrawElement::MakeRotatedBox(
OutDrawElements,
++LayerId,
PaintGeometry,
CameraImage,
MyClippingRect,
ESlateDrawEffect::None,
FMath::DegreesToRadians(ObserverRotation.Yaw),
CameraImage->ImageSize*0.5f,
FSlateDrawElement::RelativeToElement
);
}
FVector PlayerPosition;
FRotator PlayerRotation;
if (WorldModel->GetPlayerView(PlayerPosition, PlayerRotation))
{
FVector2D PlayerPositionScreen = GraphCoordToPanelCoord(FVector2D(PlayerPosition.X, PlayerPosition.Y));
const FSlateBrush* CameraImage = FEditorStyle::GetBrush(TEXT("WorldBrowser.SimulationViewPositon"));
FPaintGeometry PaintGeometry = AllottedGeometry.ToPaintGeometry(
PlayerPositionScreen - CameraImage->ImageSize*0.5f,
CameraImage->ImageSize
);
FSlateDrawElement::MakeRotatedBox(
OutDrawElements,
++LayerId,
PaintGeometry,
CameraImage,
MyClippingRect,
ESlateDrawEffect::None,
FMath::DegreesToRadians(PlayerRotation.Yaw),
CameraImage->ImageSize*0.5f,
FSlateDrawElement::RelativeToElement,
FLinearColor(FColorList::Orange)
);
}
}
LayerId = PaintScaleRuler(AllottedGeometry, MyClippingRect, OutDrawElements, LayerId);
return LayerId;
}
int32 SSlider::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
// we draw the slider like a horizontal slider regardless of the orientation, and apply a render transform to make it display correctly.
// However, the AllottedGeometry is computed as it will be rendered, so we have to use the "horizontal orientation" when doing drawing computations.
const float AllottedWidth = Orientation == Orient_Horizontal ? AllottedGeometry.GetLocalSize().X : AllottedGeometry.GetLocalSize().Y;
const float AllottedHeight = Orientation == Orient_Horizontal ? AllottedGeometry.GetLocalSize().Y : AllottedGeometry.GetLocalSize().X;
float HandleRotation;
FVector2D HandleTopLeftPoint;
FVector2D SliderStartPoint;
FVector2D SliderEndPoint;
// calculate slider geometry as if it's a horizontal slider (we'll rotate it later if it's vertical)
const FVector2D HandleSize = Style->NormalThumbImage.ImageSize;
const FVector2D HalfHandleSize = 0.5f * HandleSize;
const float Indentation = IndentHandle.Get() ? HandleSize.X : 0.0f;
const float SliderLength = AllottedWidth - Indentation;
const float SliderPercent = ValueAttribute.Get();
const float SliderHandleOffset = SliderPercent * SliderLength;
const float SliderY = 0.5f * AllottedHeight;
HandleRotation = 0.0f;
HandleTopLeftPoint = FVector2D(SliderHandleOffset - ( HandleSize.X * SliderPercent ) + 0.5f * Indentation, SliderY - HalfHandleSize.Y);
SliderStartPoint = FVector2D(HalfHandleSize.X, SliderY);
SliderEndPoint = FVector2D(AllottedWidth - HalfHandleSize.X, SliderY);
FSlateRect RotatedClippingRect = MyClippingRect;
FGeometry SliderGeometry = AllottedGeometry;
// rotate the slider 90deg if it's vertical. The 0 side goes on the bottom, the 1 side on the top.
if (Orientation == Orient_Vertical)
{
// Do this by translating along -X by the width of the geometry, then rotating 90 degreess CCW (left-hand coords)
FSlateRenderTransform SlateRenderTransform = TransformCast<FSlateRenderTransform>(Concatenate(Inverse(FVector2D(AllottedWidth, 0)), FQuat2D(FMath::DegreesToRadians(-90.0f))));
// create a child geometry matching this one, but with the render transform.
SliderGeometry = AllottedGeometry.MakeChild(
FVector2D(AllottedWidth, AllottedHeight),
FSlateLayoutTransform(),
SlateRenderTransform, FVector2D::ZeroVector);
// The clipping rect is already given properly in window space. But we do not support layout rotations, so our local space rendering cannot
// get the clipping rect into local space properly for the local space clipping we do in the shader.
// Thus, we transform the clip coords into local space manually, UNDO the render transform so it will clip properly,
// and then bring the clip coords back into window space where DrawElements expect them.
RotatedClippingRect = TransformRect(
Concatenate(
Inverse(SliderGeometry.GetAccumulatedLayoutTransform()),
Inverse(SlateRenderTransform),
SliderGeometry.GetAccumulatedLayoutTransform()),
MyClippingRect);
}
const bool bEnabled = ShouldBeEnabled(bParentEnabled);
const ESlateDrawEffect::Type DrawEffects = bEnabled ? ESlateDrawEffect::None : ESlateDrawEffect::DisabledEffect;
// draw slider bar
auto BarTopLeft = FVector2D(SliderStartPoint.X, SliderStartPoint.Y - Style->BarThickness * 0.5f);
auto BarSize = FVector2D(SliderEndPoint.X - SliderStartPoint.X, Style->BarThickness);
FSlateDrawElement::MakeBox(
OutDrawElements,
LayerId,
SliderGeometry.ToPaintGeometry(BarTopLeft, BarSize),
LockedAttribute.Get() ? &Style->DisabledBarImage : &Style->NormalBarImage,
RotatedClippingRect,
DrawEffects,
SliderBarColor.Get().GetColor(InWidgetStyle) * InWidgetStyle.GetColorAndOpacityTint()
);
++LayerId;
// draw slider thumb
FSlateDrawElement::MakeBox(
OutDrawElements,
LayerId,
SliderGeometry.ToPaintGeometry(HandleTopLeftPoint, Style->NormalThumbImage.ImageSize),
LockedAttribute.Get() ? &Style->DisabledThumbImage : &Style->NormalThumbImage,
RotatedClippingRect,
DrawEffects,
SliderHandleColor.Get().GetColor(InWidgetStyle) * InWidgetStyle.GetColorAndOpacityTint()
);
return LayerId;
}