SNaBorderedWindow: self-contained drag via real layout position

Plugins/NaWidgets/Source/NaWidgets/NaWidgets.Build.cs

@@ -38,7 +38,8 @@ public NaWidgets(ReadOnlyTargetRules Target) : base(Target)
 				"CoreUObject",
 				"Engine",
 				"Slate",
-				"SlateCore"
+				"SlateCore",
+				"UMG"
 				// ... add private dependencies that you statically link with here ...	
 			}
 			);

Plugins/NaWidgets/Source/NaWidgets/Private/Widgets/WindowWidgets/NaBorderedWindow.cpp

@@ -0,0 +1,62 @@
+// By Sodium
+
+#include "Widgets/WindowWidgets/NaBorderedWindow.h"
+
+TSharedRef<SWidget> UNaBorderedWindow::RebuildWidget()
+{
+	TSharedPtr<SWidget> ContentSlate;
+	if (Content)
+		ContentSlate = Content->TakeWidget();
+
+	SAssignNew(BorderedWindow, SNaBorderedWindow)
+		.Params(&Params)
+		.MinBodySize(MinBodySize)
+		.MaxBodySize(MaxBodySize)
+		.Content(ContentSlate);
+
+	return BorderedWindow.ToSharedRef();
+}
+
+void UNaBorderedWindow::ReleaseSlateResources(bool bReleaseChildren)
+{
+	Super::ReleaseSlateResources(bReleaseChildren);
+	BorderedWindow.Reset();
+}
+
+void UNaBorderedWindow::SynchronizeProperties()
+{
+	Super::SynchronizeProperties();
+	if (BorderedWindow.IsValid())
+	{
+		BorderedWindow->UpdateImages(Params);
+		BorderedWindow->SetBorderWidths(Params.BorderTop, Params.BorderBottom, Params.BorderLeft, Params.BorderRight);
+		BorderedWindow->SetBodySize(Params.BodySize);
+	}
+}
+
+const FText UNaBorderedWindow::GetPaletteCategory()
+{
+	return FText::FromString(TEXT("NaWidgets"));
+}
+
+void UNaBorderedWindow::SetBodySize(FVector2D NewSize)
+{
+	Params.BodySize = NewSize;
+	if (BorderedWindow.IsValid())
+		BorderedWindow->SetBodySize(NewSize);
+}
+
+void UNaBorderedWindow::SetBorderWidths(float Top, float Bottom, float Left, float Right)
+{
+	Params.BorderTop    = Top;
+	Params.BorderBottom = Bottom;
+	Params.BorderLeft   = Left;
+	Params.BorderRight  = Right;
+	if (BorderedWindow.IsValid())
+		BorderedWindow->SetBorderWidths(Top, Bottom, Left, Right);
+}
+
+FVector2D UNaBorderedWindow::GetBodySize() const
+{
+	return Params.BodySize;
+}

Plugins/NaWidgets/Source/NaWidgets/Private/Widgets/WindowWidgets/SNaBorderedWindow.cpp

@@ -0,0 +1,264 @@
+// By Sodium
+
+#include "Widgets/WindowWidgets/SNaBorderedWindow.h"
+#include "SlateOptMacros.h"
+#include "Widgets/Images/SImage.h"
+#include "Widgets/SCanvas.h"
+#include "Widgets/Layout/SBox.h"
+#include "Widgets/SNullWidget.h"
+#include "Styling/CoreStyle.h"
+
+static FSlateBrush MakeBorderedWindowBrush(UObject* ResourceObj, FVector2D Size)
+{
+	FSlateBrush Brush = *FCoreStyle::Get().GetDefaultBrush();
+	Brush.SetResourceObject(ResourceObj);
+	Brush.SetImageSize(Size);
+	Brush.Tiling = ESlateBrushTileType::NoTile;
+	return Brush;
+}
+
+BEGIN_SLATE_FUNCTION_BUILD_OPTIMIZATION
+void SNaBorderedWindow::Construct(const FArguments& InArgs)
+{
+	if (InArgs._Params.Get())
+		Params = *InArgs._Params.Get();
+	MinBodySize = InArgs._MinBodySize.Get();
+	MaxBodySize = InArgs._MaxBodySize.Get();
+	ContentWidget = InArgs._Content.Get();
+
+	// Initialize brushes from params
+	BrushTopLeft     = MakeBorderedWindowBrush(Params.ImageTopLeft,     FVector2D(Params.BorderLeft,  Params.BorderTop));
+	BrushTop         = MakeBorderedWindowBrush(Params.ImageTop,         FVector2D(Params.BodySize.X,  Params.BorderTop));
+	BrushTopRight    = MakeBorderedWindowBrush(Params.ImageTopRight,    FVector2D(Params.BorderRight, Params.BorderTop));
+	BrushLeft        = MakeBorderedWindowBrush(Params.ImageLeft,        FVector2D(Params.BorderLeft,  Params.BodySize.Y));
+	BrushCenter      = MakeBorderedWindowBrush(Params.ImageCenter,      Params.BodySize);
+	BrushRight       = MakeBorderedWindowBrush(Params.ImageRight,       FVector2D(Params.BorderRight, Params.BodySize.Y));
+	BrushBottomLeft  = MakeBorderedWindowBrush(Params.ImageBottomLeft,  FVector2D(Params.BorderLeft,  Params.BorderBottom));
+	BrushBottom      = MakeBorderedWindowBrush(Params.ImageBottom,      FVector2D(Params.BodySize.X,  Params.BorderBottom));
+	BrushBottomRight = MakeBorderedWindowBrush(Params.ImageBottomRight, FVector2D(Params.BorderRight, Params.BorderBottom));
+
+	// Create image sub-widgets
+	SAssignNew(ImgTopLeft,     SImage).Image(&BrushTopLeft);
+	SAssignNew(ImgTop,         SImage).Image(&BrushTop);
+	SAssignNew(ImgTopRight,    SImage).Image(&BrushTopRight);
+	SAssignNew(ImgLeft,        SImage).Image(&BrushLeft);
+	SAssignNew(ImgCenter,      SImage).Image(&BrushCenter);
+	SAssignNew(ImgRight,       SImage).Image(&BrushRight);
+	SAssignNew(ImgBottomLeft,  SImage).Image(&BrushBottomLeft);
+	SAssignNew(ImgBottom,      SImage).Image(&BrushBottom);
+	SAssignNew(ImgBottomRight, SImage).Image(&BrushBottomRight);
+
+	RebuildLayout();
+}
+END_SLATE_FUNCTION_BUILD_OPTIMIZATION
+
+void SNaBorderedWindow::RebuildLayout()
+{
+	// Update brush sizes to match current params
+	BrushTopLeft.SetImageSize(FVector2D(Params.BorderLeft,  Params.BorderTop));
+	BrushTop.SetImageSize(FVector2D(Params.BodySize.X,  Params.BorderTop));
+	BrushTopRight.SetImageSize(FVector2D(Params.BorderRight, Params.BorderTop));
+	BrushLeft.SetImageSize(FVector2D(Params.BorderLeft,  Params.BodySize.Y));
+	BrushCenter.SetImageSize(Params.BodySize);
+	BrushRight.SetImageSize(FVector2D(Params.BorderRight, Params.BodySize.Y));
+	BrushBottomLeft.SetImageSize(FVector2D(Params.BorderLeft,  Params.BorderBottom));
+	BrushBottom.SetImageSize(FVector2D(Params.BodySize.X,  Params.BorderBottom));
+	BrushBottomRight.SetImageSize(FVector2D(Params.BorderRight, Params.BorderBottom));
+
+	const FVector2D TotalSize(
+		Params.BorderLeft + Params.BodySize.X + Params.BorderRight,
+		Params.BorderTop  + Params.BodySize.Y + Params.BorderBottom
+	);
+
+	// Slot positions
+	const FVector2D PosTopLeft    (0.f,                                    0.f);
+	const FVector2D PosTop        (Params.BorderLeft,                      0.f);
+	const FVector2D PosTopRight   (Params.BorderLeft + Params.BodySize.X,  0.f);
+	const FVector2D PosLeft       (0.f,                                    Params.BorderTop);
+	const FVector2D PosCenter     (Params.BorderLeft,                      Params.BorderTop);
+	const FVector2D PosRight      (Params.BorderLeft + Params.BodySize.X,  Params.BorderTop);
+	const FVector2D PosBottomLeft (0.f,                                    Params.BorderTop + Params.BodySize.Y);
+	const FVector2D PosBottom     (Params.BorderLeft,                      Params.BorderTop + Params.BodySize.Y);
+	const FVector2D PosBottomRight(Params.BorderLeft + Params.BodySize.X,  Params.BorderTop + Params.BodySize.Y);
+
+	// Slot sizes
+	const FVector2D SzCornerTL(Params.BorderLeft,  Params.BorderTop);
+	const FVector2D SzTop     (Params.BodySize.X,  Params.BorderTop);
+	const FVector2D SzCornerTR(Params.BorderRight, Params.BorderTop);
+	const FVector2D SzLeft    (Params.BorderLeft,  Params.BodySize.Y);
+	const FVector2D SzCenter  (Params.BodySize);
+	const FVector2D SzRight   (Params.BorderRight, Params.BodySize.Y);
+	const FVector2D SzCornerBL(Params.BorderLeft,  Params.BorderBottom);
+	const FVector2D SzBottom  (Params.BodySize.X,  Params.BorderBottom);
+	const FVector2D SzCornerBR(Params.BorderRight, Params.BorderBottom);
+
+	// Optional content widget placed over the center area
+	const TSharedRef<SWidget> CenterContent = ContentWidget.IsValid()
+		? ContentWidget.ToSharedRef()
+		: SNullWidget::NullWidget;
+
+	// Rebuild canvas with updated absolute positions/sizes
+	SAssignNew(Canvas, SCanvas)
+		+ SCanvas::Slot().Position(PosTopLeft).Size(SzCornerTL)    [ImgTopLeft.ToSharedRef()]
+		+ SCanvas::Slot().Position(PosTop).Size(SzTop)             [ImgTop.ToSharedRef()]
+		+ SCanvas::Slot().Position(PosTopRight).Size(SzCornerTR)   [ImgTopRight.ToSharedRef()]
+		+ SCanvas::Slot().Position(PosLeft).Size(SzLeft)           [ImgLeft.ToSharedRef()]
+		+ SCanvas::Slot().Position(PosCenter).Size(SzCenter)       [ImgCenter.ToSharedRef()]
+		+ SCanvas::Slot().Position(PosRight).Size(SzRight)         [ImgRight.ToSharedRef()]
+		+ SCanvas::Slot().Position(PosBottomLeft).Size(SzCornerBL) [ImgBottomLeft.ToSharedRef()]
+		+ SCanvas::Slot().Position(PosBottom).Size(SzBottom)       [ImgBottom.ToSharedRef()]
+		+ SCanvas::Slot().Position(PosBottomRight).Size(SzCornerBR)[ImgBottomRight.ToSharedRef()]
+		+ SCanvas::Slot().Position(PosCenter).Size(SzCenter)       [CenterContent];
+
+	// Outer canvas: its single slot's position is driven by WindowPosition so that
+	// dragging changes the real layout position, moving all children with it.
+	SAssignNew(OuterCanvas, SCanvas)
+		+ SCanvas::Slot()
+		  .Position(TAttribute<FVector2D>::CreateSP(this, &SNaBorderedWindow::GetWindowPosition))
+		  .Size(TotalSize)
+		  [
+			SNew(SBox)
+			.WidthOverride(TotalSize.X)
+			.HeightOverride(TotalSize.Y)
+			[
+				Canvas.ToSharedRef()
+			]
+		  ];
+
+	ChildSlot
+	[
+		OuterCanvas.ToSharedRef()
+	];
+}
+
+FVector2D SNaBorderedWindow::ClampBodySize(FVector2D Size) const
+{
+	return FVector2D(
+		FMath::Clamp(Size.X, MinBodySize.X, MaxBodySize.X),
+		FMath::Clamp(Size.Y, MinBodySize.Y, MaxBodySize.Y)
+	);
+}
+
+void SNaBorderedWindow::SetBodySize(FVector2D NewSize)
+{
+	Params.BodySize = ClampBodySize(NewSize);
+	RebuildLayout();
+}
+
+void SNaBorderedWindow::SetBorderWidths(float Top, float Bottom, float Left, float Right)
+{
+	Params.BorderTop    = Top;
+	Params.BorderBottom = Bottom;
+	Params.BorderLeft   = Left;
+	Params.BorderRight  = Right;
+	RebuildLayout();
+}
+
+void SNaBorderedWindow::UpdateImages(const FNaBorderedWindowParams& NewParams)
+{
+	Params = NewParams;
+	BrushTopLeft.SetResourceObject(Params.ImageTopLeft);
+	BrushTop.SetResourceObject(Params.ImageTop);
+	BrushTopRight.SetResourceObject(Params.ImageTopRight);
+	BrushLeft.SetResourceObject(Params.ImageLeft);
+	BrushCenter.SetResourceObject(Params.ImageCenter);
+	BrushRight.SetResourceObject(Params.ImageRight);
+	BrushBottomLeft.SetResourceObject(Params.ImageBottomLeft);
+	BrushBottom.SetResourceObject(Params.ImageBottom);
+	BrushBottomRight.SetResourceObject(Params.ImageBottomRight);
+	RebuildLayout();
+}
+
+FReply SNaBorderedWindow::OnMouseButtonDown(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
+{
+	if (MouseEvent.GetEffectingButton() == EKeys::LeftMouseButton)
+	{
+		const FVector2D LocalPos = MyGeometry.AbsoluteToLocal(MouseEvent.GetScreenSpacePosition());
+		const EWindowRegion Region = GetRegionAtPosition(MyGeometry, LocalPos);
+
+		if (Region == EWindowRegion::TopBorder)
+		{
+			bIsDragging = true;
+			DragStartPosition = MouseEvent.GetScreenSpacePosition();
+			DragStartWindowPosition = WindowPosition;
+			return FReply::Handled().CaptureMouse(SharedThis(this));
+		}
+		else if (Region == EWindowRegion::BottomRightCorner)
+		{
+			bIsResizing = true;
+			DragStartPosition = LocalPos;
+			DragStartBodySize = Params.BodySize;
+			return FReply::Handled().CaptureMouse(SharedThis(this));
+		}
+	}
+
+	return FReply::Unhandled();
+}
+
+FReply SNaBorderedWindow::OnMouseButtonUp(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
+{
+	if (MouseEvent.GetEffectingButton() == EKeys::LeftMouseButton)
+	{
+		if (bIsDragging || bIsResizing)
+		{
+			bIsDragging = false;
+			bIsResizing = false;
+			return FReply::Handled().ReleaseMouseCapture();
+		}
+	}
+
+	return FReply::Unhandled();
+}
+
+FReply SNaBorderedWindow::OnMouseMove(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
+{
+	if (bIsResizing)
+	{
+		const FVector2D CurrentPos = MyGeometry.AbsoluteToLocal(MouseEvent.GetScreenSpacePosition());
+		const FVector2D Delta = CurrentPos - DragStartPosition;
+
+		FVector2D NewBodySize = DragStartBodySize + Delta;
+		Params.BodySize = ClampBodySize(NewBodySize);
+		RebuildLayout();
+		return FReply::Handled();
+	}
+	else if (bIsDragging)
+	{
+		const FVector2D Delta = MouseEvent.GetScreenSpacePosition() - DragStartPosition;
+		WindowPosition = DragStartWindowPosition + Delta;
+		OuterCanvas->Invalidate(EInvalidateWidgetReason::Layout);
+		return FReply::Handled();
+	}
+
+	return FReply::Unhandled();
+}
+
+SNaBorderedWindow::EWindowRegion SNaBorderedWindow::GetRegionAtPosition(
+	const FGeometry& MyGeometry, const FVector2D& LocalPosition) const
+{
+	// Bottom-right corner
+	if (LocalPosition.X >= Params.BorderLeft + Params.BodySize.X &&
+		LocalPosition.Y >= Params.BorderTop  + Params.BodySize.Y)
+	{
+		return EWindowRegion::BottomRightCorner;
+	}
+
+	// Top border (excluding corners)
+	if (LocalPosition.Y < Params.BorderTop &&
+		LocalPosition.X >= Params.BorderLeft &&
+		LocalPosition.X <  Params.BorderLeft + Params.BodySize.X)
+	{
+		return EWindowRegion::TopBorder;
+	}
+
+	// Center
+	if (LocalPosition.X >= Params.BorderLeft &&
+		LocalPosition.X <  Params.BorderLeft + Params.BodySize.X &&
+		LocalPosition.Y >= Params.BorderTop  &&
+		LocalPosition.Y <  Params.BorderTop  + Params.BodySize.Y)
+	{
+		return EWindowRegion::Center;
+	}
+
+	return EWindowRegion::None;
+}

Plugins/NaWidgets/Source/NaWidgets/Public/Widgets/WindowWidgets/NaBorderedWindow.h

@@ -0,0 +1,50 @@
+// By Sodium
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Components/Widget.h"
+#include "Widgets/WindowWidgets/SNaBorderedWindow.h"
+#include "NaBorderedWindow.generated.h"
+
+/**
+ * UMG wrapper for SNaBorderedWindow.
+ * Exposes the 9-part bordered window widget for use in UMG and Blueprints.
+ */
+UCLASS()
+class NAWIDGETS_API UNaBorderedWindow : public UWidget
+{
+	GENERATED_BODY()
+
+public:
+	/** Image and size configuration for all 9 parts. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Appearance")
+	FNaBorderedWindowParams Params;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Sizing")
+	FVector2D MinBodySize = FVector2D(50.f, 50.f);
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Sizing")
+	FVector2D MaxBodySize = FVector2D(1000.f, 1000.f);
+
+	/** Optional widget placed over the center body area. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Content")
+	UWidget* Content = nullptr;
+
+	UFUNCTION(BlueprintCallable, Category = "Bordered Window")
+	void SetBodySize(FVector2D NewSize);
+
+	UFUNCTION(BlueprintCallable, Category = "Bordered Window")
+	void SetBorderWidths(float Top, float Bottom, float Left, float Right);
+
+	UFUNCTION(BlueprintCallable, Category = "Bordered Window")
+	FVector2D GetBodySize() const;
+
+	TSharedPtr<SNaBorderedWindow> BorderedWindow;
+
+protected:
+	virtual TSharedRef<SWidget> RebuildWidget() override;
+	virtual void ReleaseSlateResources(bool bReleaseChildren) override;
+	virtual void SynchronizeProperties() override;
+	virtual const FText GetPaletteCategory() override;
+};