FKeyAreaLayout::FKeyAreaLayout(FSequencerDisplayNode& InNode, int32 InSectionIndex)
{
TotalHeight = 0.f;
float LastPadding = 0.f;
auto SetupKeyArea = [&](FSequencerDisplayNode& Node){
if (Node.GetType() == ESequencerNode::KeyArea)
{
Elements.Add(FKeyAreaLayoutElement::FromKeyAreaNode(StaticCastSharedRef<FSectionKeyAreaNode>(Node.AsShared()), InSectionIndex, TotalHeight));
}
else if (!Node.IsExpanded())
{
Elements.Add(FKeyAreaLayoutElement::FromGroup(Node.UpdateKeyGrouping(InSectionIndex), TotalHeight, Node.GetNodeHeight()));
}
};
// First, layout the parent
{
FSequencerDisplayNode* LayoutNode = &InNode;
if (InNode.GetType() == ESequencerNode::Track)
{
TSharedPtr<FSequencerDisplayNode> KeyAreaNode = static_cast<FTrackNode&>(InNode).GetTopLevelKeyNode();
if (KeyAreaNode.IsValid())
{
LayoutNode = KeyAreaNode.Get();
}
}
SetupKeyArea(*LayoutNode);
LastPadding = LayoutNode->GetNodePadding().Bottom;
TotalHeight += LayoutNode->GetNodeHeight() + LastPadding;
}
// Then any children
InNode.TraverseVisible_ParentFirst([&](FSequencerDisplayNode& Node){
TotalHeight += Node.GetNodePadding().Top;
SetupKeyArea(Node);
LastPadding = Node.GetNodePadding().Bottom;
TotalHeight += Node.GetNodeHeight() + LastPadding;
return true;
}, false);
// Remove the padding from the bottom
TotalHeight -= LastPadding;
}
FSectionLayout::FSectionLayout(FSequencerDisplayNode& InNode, int32 InSectionIndex)
{
float VerticalOffset = 0.f;
auto SetupKeyArea = [&](FSequencerDisplayNode& Node){
if (Node.GetType() == ESequencerNode::KeyArea)
{
Elements.Add(FSectionLayoutElement::FromKeyAreaNode(
StaticCastSharedRef<FSequencerSectionKeyAreaNode>(Node.AsShared()),
InSectionIndex,
VerticalOffset
));
}
else if (Node.GetType() == ESequencerNode::Track && static_cast<FSequencerTrackNode&>(Node).GetTopLevelKeyNode().IsValid())
{
Elements.Add(FSectionLayoutElement::FromTrack(
StaticCastSharedRef<FSequencerTrackNode>(Node.AsShared()),
InSectionIndex,
VerticalOffset
));
}
else if (!Node.IsExpanded())
{
Elements.Add(FSectionLayoutElement::FromGroup(
Node.AsShared(),
Node.UpdateKeyGrouping(InSectionIndex),
VerticalOffset
));
}
else
{
// It's benign space
Elements.Add(FSectionLayoutElement::EmptySpace(
Node.AsShared(),
VerticalOffset
));
}
};
// First, layout the parent
{
VerticalOffset += InNode.GetNodePadding().Top;
SetupKeyArea(InNode);
VerticalOffset += InNode.GetNodeHeight() + InNode.GetNodePadding().Bottom;
}
// Then any children
InNode.TraverseVisible_ParentFirst([&](FSequencerDisplayNode& Node){
VerticalOffset += Node.GetNodePadding().Top;
SetupKeyArea(Node);
VerticalOffset += Node.GetNodeHeight() + Node.GetNodePadding().Bottom;
return true;
}, false);
}