Working on new root canvas stuff

Source/Integration/RootCanvas.cpp

@@ -0,0 +1,101 @@
+////////////////////////////////////////////////////////////
+//
+// RootCanvas.cpp
+//
+////////////////////////////////////////////////////////////
+
+#include "RootCanvas.h"
+#include "Common.h"
+#include "Blueprint/UserWidget.h"
+
+UlxRootCanvasSlot::UlxRootCanvasSlot(const FObjectInitializer& ObjectInitializer)
+	: Super(ObjectInitializer)
+{
+	// Children of the root canvas default to filling the parent,
+	// matching the viewport's "stretch" behavior. Individual widgets
+	// can still override anchors/offsets after being added.
+	SetAnchors(FAnchors(0.0f, 0.0f, 1.0f, 1.0f));
+	SetOffsets(FMargin(0.0f, 0.0f, 0.0f, 0.0f));
+}
+
+UClass* UlxRootCanvasPanel::GetSlotClass() const
+{
+	return UlxRootCanvasSlot::StaticClass();
+}
+
+UlxRootCanvasSlot *UlxRootCanvasPanel::GetRootCanvasSlot(UUserWidget *Widget, ElxSuccessOrWrongType &Result)
+{
+	if (IsValid(Widget))
+	{
+		if (UlxRootCanvasSlot *Slot = Cast<UlxRootCanvasSlot>(Widget->Slot))
+		{
+			Result = ElxSuccessOrWrongType::Success;
+			return Slot;
+		}
+	}
+	Result = ElxSuccessOrWrongType::WrongType;
+	return nullptr;
+}
+
+UlxRootCanvasSlot* UlxRootCanvasPanel::AddChildToRootCanvas(UWidget* Content)
+{
+	return Cast<UlxRootCanvasSlot>(Super::AddChild(Content));
+}
+
+int32 UlxRootCanvasPanel::GetMaxZOrder() const
+{
+	int32 MaxZOrder = 0;
+	for (UPanelSlot *PanelSlot : Slots)
+	{
+		UlxRootCanvasSlot *TypedSlot = Cast<UlxRootCanvasSlot>(PanelSlot);
+		check(TypedSlot);
+		MaxZOrder = FMath::Max(MaxZOrder, TypedSlot->GetZOrder());
+	}
+	return MaxZOrder;
+}
+
+TArray<UlxRootCanvasSlot*> UlxRootCanvasPanel::GetSortedUserWidgets()
+{
+	TArray<UlxRootCanvasSlot*> Result;
+	Result.Reserve(Slots.Num());
+	for (UPanelSlot *PanelSlot : Slots)
+	{
+		UlxRootCanvasSlot *TypedSlot = Cast<UlxRootCanvasSlot>(PanelSlot);
+		check(TypedSlot);
+		if (Cast<UUserWidget>(TypedSlot->Content) == nullptr) continue;
+		Result.Add(TypedSlot);
+	}
+	Result.StableSort([](const UlxRootCanvasSlot &A, const UlxRootCanvasSlot &B)
+	{
+		return A.GetZOrder() > B.GetZOrder();
+	});
+	return Result;
+}
+
+
+void UlxRootCanvasPanel::SetWidgetWindowManagement(class UUserWidget *Widget,
+		bool ShowPointer, bool BlockInput, bool EnableEnhancedInput, bool BringToFront, UWidget *DesiredFocusWidget)
+{
+	if (!IsValid(Widget))
+	{
+		UE_LOG(LogLuprexIntegration, Error, TEXT("ManageRootWidget called with an invalid widget."));
+		return;
+	}
+	UlxRootCanvasSlot *Slot = Cast<UlxRootCanvasSlot>(Widget->Slot);
+	if (Slot == nullptr)
+	{
+		UE_LOG(LogLuprexIntegration, Error, TEXT("Widget is not yet a root widget, use 'AddWidgetToRoot' first"));
+		return;
+	}
+	UlxRootCanvasPanel *Panel = Cast<UlxRootCanvasPanel>(Slot->Parent);
+	check(Panel);
+	Slot->ShowPointer = ShowPointer;
+	Slot->BlockInput = BlockInput;
+	Slot->EnableEnhancedInput = EnableEnhancedInput;
+	Widget->SetDesiredFocusWidget(DesiredFocusWidget);
+	if (BringToFront)
+	{
+		Slot->SetZOrder(Panel->GetMaxZOrder() + 1);
+	}
+}
+