void UCanvasPanelSlot::PostEditChangeChainProperty(struct FPropertyChangedChainEvent& PropertyChangedEvent)
{
SynchronizeProperties();
static FName AnchorsProperty(TEXT("Anchors"));
FEditPropertyChain::TDoubleLinkedListNode* AnchorNode = PropertyChangedEvent.PropertyChain.GetHead()->GetNextNode();
if ( !AnchorNode )
{
return;
}
FEditPropertyChain::TDoubleLinkedListNode* LayoutDataNode = AnchorNode->GetNextNode();
if ( !LayoutDataNode )
{
return;
}
UProperty* AnchorProperty = LayoutDataNode->GetValue();
if ( AnchorProperty && AnchorProperty->GetFName() == AnchorsProperty )
{
RebaseLayout();
}
Super::PostEditChangeProperty(PropertyChangedEvent);
}
void USizeBoxSlot::BuildSlot(TSharedRef<SBox> InSizeBox)
{
SizeBox = InSizeBox;
SynchronizeProperties();
SizeBox->SetContent(Content ? Content->TakeWidget() : SNullWidget::NullWidget);
}
void UCanvasPanelSlot::BuildSlot(TSharedRef<SConstraintCanvas> Canvas)
{
Slot = &Canvas->AddSlot()
[
Content == nullptr ? SNullWidget::NullWidget : Content->TakeWidget()
];
SynchronizeProperties();
}
/**
* Synchronizes a DFM tree with a VMT tree.
* @param dfmres DFM tree.
* @param vmtdir VMT tree.
**/
void synchronize(DFMData& dfmres, const VMTDir& vmtdir)
{
std::vector<std::string*> objectnames;
std::deque<DFMResource*> dfms;
fill(dfmres, dfms);
std::for_each(dfms.begin(), dfms.end(), SynchronizeName(vmtdir));
std::for_each(dfms.begin(), dfms.end(), SynchronizeClassName(vmtdir));
std::for_each(dfms.begin(), dfms.end(), SynchronizeProperties(vmtdir, dfmres));
}
void UCanvasPanelSlot::RebaseLayout(bool PreserveSize)
{
// Ensure we have a parent canvas
if ( UCanvasPanel* Canvas = Cast<UCanvasPanel>(Parent) )
{
FGeometry Geometry;
if ( Canvas->GetGeometryForSlot(this, Geometry) )
{
// Calculate the default anchor offset, ie where would this control be laid out if no offset were provided.
FVector2D CanvasSize = Canvas->GetCanvasWidget()->GetCachedGeometry().Size;
FMargin AnchorPositions = FMargin(
LayoutData.Anchors.Minimum.X * CanvasSize.X,
LayoutData.Anchors.Minimum.Y * CanvasSize.Y,
LayoutData.Anchors.Maximum.X * CanvasSize.X,
LayoutData.Anchors.Maximum.Y * CanvasSize.Y);
FVector2D DefaultAnchorPosition = FVector2D(AnchorPositions.Left, AnchorPositions.Top);
// Determine the amount that would be offset from the anchor position if alignment was applied.
FVector2D AlignmentOffset = LayoutData.Alignment * PreEditGeometry.Size;
FVector2D MoveDelta = Geometry.Position - PreEditGeometry.Position;
// Determine where the widget's new position needs to be to maintain a stable location when the anchors change.
FVector2D LeftTopDelta = PreEditGeometry.Position - DefaultAnchorPosition;
const bool bAnchorsMoved = PreEditLayoutData.Anchors.Minimum != LayoutData.Anchors.Minimum || PreEditLayoutData.Anchors.Maximum != LayoutData.Anchors.Maximum;
const bool bMoved = PreEditLayoutData.Offsets.Left != LayoutData.Offsets.Left || PreEditLayoutData.Offsets.Top != LayoutData.Offsets.Top;
if ( bAnchorsMoved )
{
// Adjust the size to remain constant
if ( !LayoutData.Anchors.IsStretchedHorizontal() && PreEditLayoutData.Anchors.IsStretchedHorizontal() )
{
// Adjust the position to remain constant
LayoutData.Offsets.Left = LeftTopDelta.X + AlignmentOffset.X;
LayoutData.Offsets.Right = PreEditGeometry.Size.X;
}
else if ( !PreserveSize && LayoutData.Anchors.IsStretchedHorizontal() && !PreEditLayoutData.Anchors.IsStretchedHorizontal() )
{
// Adjust the position to remain constant
LayoutData.Offsets.Left = 0;
LayoutData.Offsets.Right = 0;
}
else if ( LayoutData.Anchors.IsStretchedHorizontal() )
{
// Adjust the position to remain constant
LayoutData.Offsets.Left = LeftTopDelta.X;
LayoutData.Offsets.Right = AnchorPositions.Right - ( AnchorPositions.Left + LayoutData.Offsets.Left + PreEditGeometry.Size.X );
}
else
{
// Adjust the position to remain constant
LayoutData.Offsets.Left = LeftTopDelta.X + AlignmentOffset.X;
}
if ( !LayoutData.Anchors.IsStretchedVertical() && PreEditLayoutData.Anchors.IsStretchedVertical() )
{
// Adjust the position to remain constant
LayoutData.Offsets.Top = LeftTopDelta.Y + AlignmentOffset.Y;
LayoutData.Offsets.Bottom = PreEditGeometry.Size.Y;
}
else if ( !PreserveSize && LayoutData.Anchors.IsStretchedVertical() && !PreEditLayoutData.Anchors.IsStretchedVertical() )
{
// Adjust the position to remain constant
LayoutData.Offsets.Top = 0;
LayoutData.Offsets.Bottom = 0;
}
else if ( LayoutData.Anchors.IsStretchedVertical() )
{
// Adjust the position to remain constant
LayoutData.Offsets.Top = LeftTopDelta.Y;
LayoutData.Offsets.Bottom = AnchorPositions.Bottom - ( AnchorPositions.Top + LayoutData.Offsets.Top + PreEditGeometry.Size.Y );
}
else
{
// Adjust the position to remain constant
LayoutData.Offsets.Top = LeftTopDelta.Y + AlignmentOffset.Y;
}
}
else if ( DesiredPosition.IsSet() )
{
FVector2D NewLocalPosition = DesiredPosition.GetValue();
LayoutData.Offsets.Left = NewLocalPosition.X - AnchorPositions.Left;
LayoutData.Offsets.Top = NewLocalPosition.Y - AnchorPositions.Top;
if ( LayoutData.Anchors.IsStretchedHorizontal() )
{
LayoutData.Offsets.Right -= LayoutData.Offsets.Left - PreEditLayoutData.Offsets.Left;
}
else
{
LayoutData.Offsets.Left += AlignmentOffset.X;
}
if ( LayoutData.Anchors.IsStretchedVertical() )
{
LayoutData.Offsets.Bottom -= LayoutData.Offsets.Top - PreEditLayoutData.Offsets.Top;
}
else
{
LayoutData.Offsets.Top += AlignmentOffset.Y;
}
DesiredPosition.Reset();
}
else if ( bMoved )
{
//LayoutData.Offsets.Left += LeftTopDelta.X;
//LayoutData.Offsets.Top += LeftTopDelta.Y;
LayoutData.Offsets.Left -= DefaultAnchorPosition.X;
LayoutData.Offsets.Top -= DefaultAnchorPosition.Y;
// If the slot is stretched horizontally we need to move the right side as it no longer represents width, but
// now represents margin from the right stretched side.
if ( LayoutData.Anchors.IsStretchedHorizontal() )
{
//LayoutData.Offsets.Right = PreEditLayoutData.Offsets.Top;
}
else
{
LayoutData.Offsets.Left += AlignmentOffset.X;
}
// If the slot is stretched vertically we need to move the bottom side as it no longer represents width, but
// now represents margin from the bottom stretched side.
if ( LayoutData.Anchors.IsStretchedVertical() )
{
//LayoutData.Offsets.Bottom -= MoveDelta.Y;
}
else
{
LayoutData.Offsets.Top += AlignmentOffset.Y;
}
}
}
// Apply the changes to the properties.
SynchronizeProperties();
}
}