添加可拖拽UI

ProjectFish/Binaries/Win64/UnrealEditor.modules

@@ -2,7 +2,7 @@
 	"BuildId": "37670630",
 	"Modules": 
 	{
-		"ProjectFish": "UnrealEditor-ProjectFish.dll",
-		"ProjectFishEditor": "UnrealEditor-ProjectFishEditor.dll"
+		"ProjectFish": "UnrealEditor-ProjectFish-0027.dll",
+		"ProjectFishEditor": "UnrealEditor-ProjectFishEditor-0027.dll"
 	}
 }

ProjectFish/Plugins/DeskMode/Binaries/Win64/UnrealEditor.modules

@@ -2,6 +2,6 @@
 	"BuildId": "37670630",
 	"Modules": 
 	{
-		"DeskMode": "UnrealEditor-DeskMode.dll"
+		"DeskMode": "UnrealEditor-DeskMode-0027.dll"
 	}
 }

ProjectFish/Source/ProjectFish/Gameplay/Subsystem/UIManagerSubsystem.cpp

@@ -0,0 +1,16 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "UIManagerSubsystem.h"
+#include "ProjectFish/Widget/DragableUserWidget.h"
+
+
+void UUIManagerSubsystem::AddDragWidget(UDragableUserWidget* UserWidget)
+{
+	DragDropWidget = MakeWeakObjectPtr(UserWidget);
+}
+
+void UUIManagerSubsystem::RemoveDragWidget()
+{
+	DragDropWidget.Reset();
+}

ProjectFish/Source/ProjectFish/Gameplay/Subsystem/UIManagerSubsystem.h

@@ -0,0 +1,28 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Subsystems/GameInstanceSubsystem.h"
+#include "Widgets/SWidget.h"
+#include "Blueprint/UserWidget.h"
+#include "UIManagerSubsystem.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class PROJECTFISH_API UUIManagerSubsystem : public UGameInstanceSubsystem
+{
+	GENERATED_BODY()
+public:
+	
+	UFUNCTION(BlueprintCallable, Category = "UIManagerSubsystem")
+	void AddDragWidget(class UDragableUserWidget* UserWidget);
+	UFUNCTION(BlueprintCallable, Category = "UIManagerSubsystem")
+	void RemoveDragWidget();
+	
+protected:
+	TWeakObjectPtr<class UDragableUserWidget> DragDropWidget;
+	
+};

ProjectFish/Source/ProjectFish/ProjectFish.Build.cs

@@ -9,6 +9,6 @@ public class ProjectFish : ModuleRules
 		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
 		OptimizeCode = CodeOptimization.Never;
         PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine",
-	        "InputCore", "NavigationSystem", "AIModule", "Niagara", "EnhancedInput", "GameplayTags", "DeveloperSettings" });
+	        "InputCore", "NavigationSystem", "AIModule", "Niagara", "EnhancedInput", "GameplayTags", "DeveloperSettings", "UMG", "Slate" ,"SlateCore"});
     }
 }

ProjectFish/Source/ProjectFish/Widget/DragableUserWidget.cpp

@@ -0,0 +1,120 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "DragableUserWidget.h"
+
+#include "Blueprint/WidgetLayoutLibrary.h"
+#include "Components/CanvasPanelSlot.h"
+#include "ProjectFish/Gameplay/Subsystem/UIManagerSubsystem.h"
+
+void UDragableUserWidget::SetWidgetDragable(bool Dragable)
+{
+	bDragable = Dragable;
+}
+
+void UDragableUserWidget::BeginDrag(const FGeometry& InGeometry)
+{
+	bDraging = true;
+	OriginWidgetScreenPos = InGeometry.GetAbsolutePosition();
+	UUIManagerSubsystem* UIManager = GetGameInstance()->GetSubsystem<UUIManagerSubsystem>();
+	UIManager->AddDragWidget(this);
+}
+
+void UDragableUserWidget::EndDrag()
+{
+	//取消拖拽 不处理点击事件
+	bDraging = false;
+	UUIManagerSubsystem* UIManager = GetGameInstance()->GetSubsystem<UUIManagerSubsystem>();
+	UIManager->RemoveDragWidget();
+}
+
+FReply UDragableUserWidget::NativeOnMouseButtonDown(const FGeometry& InGeometry, const FPointerEvent& InMouseEvent)
+{
+	if (bDragable && InMouseEvent.GetEffectingButton() == EKeys::LeftMouseButton)
+	{
+		if (bDraging)
+		{
+			EndDrag();
+			return FReply::Unhandled();
+		}
+		else
+		{
+			BeginDrag(InGeometry);
+			return FReply::Handled();
+		}
+	}
+	else
+	{
+		return Super::NativeOnMouseButtonDown(InGeometry, InMouseEvent);
+	}
+
+}
+
+FReply UDragableUserWidget::NativeOnMouseButtonUp(const FGeometry& InGeometry, const FPointerEvent& InMouseEvent)
+{
+	return Super::NativeOnMouseButtonUp(InGeometry, InMouseEvent);
+}
+
+FReply UDragableUserWidget::NativeOnMouseMove(const FGeometry& InGeometry, const FPointerEvent& InMouseEvent)
+{
+	if (bDraging)
+	{
+		Super::NativeOnMouseMove(InGeometry, InMouseEvent);
+        
+		// 获取鼠标在屏幕空间的绝对坐标
+		FVector2D MouseScreenPos = InMouseEvent.GetScreenSpacePosition();
+        
+		// 获取Widget在屏幕上的实际渲染尺寸
+		
+		FVector2D WidgetAbsoluteSize = InGeometry.GetDrawSize();
+        
+		// 计算Widget中心点应对应的屏幕位置
+		FVector2D DesiredCenter = MouseScreenPos;
+        
+		// 计算新的左上角位置（让中心点对准鼠标）
+		FVector2D NewTopLeft =FVector2D(DesiredCenter.X - WidgetAbsoluteSize.X * 0.5f, DesiredCenter.Y - WidgetAbsoluteSize.Y* 0.5f ); ;
+        
+		// 边界检查
+		FVector2D ViewportSize;
+		if (GEngine && GEngine->GameViewport)
+		{
+			GEngine->GameViewport->GetViewportSize(ViewportSize);
+		}
+		else
+		{
+			ViewportSize = FVector2D(1920, 1080);
+		}
+        
+		// 确保Widget不会完全移出屏幕
+		NewTopLeft.X = FMath::Clamp(NewTopLeft.X, 0.0f, ViewportSize.X - WidgetAbsoluteSize.X);
+		NewTopLeft.Y = FMath::Clamp(NewTopLeft.Y, 0.0f, ViewportSize.Y - WidgetAbsoluteSize.Y);
+        
+		// // 计算相对于原始位置的偏移量
+		// FVector2D ParentAbsolutePosition = FVector2D::ZeroVector;
+		// if (InGeometry.GetParentGeometry().IsValid())
+		// {
+		// 	ParentAbsolutePosition = InGeometry.GetParentGeometry().GetAbsolutePosition();
+		// }
+  //       
+		FVector2D LocalOffset = NewTopLeft - OriginWidgetScreenPos;
+        
+		// 应用变换
+		FWidgetTransform WidgetTransform = GetRenderTransform();
+		WidgetTransform.Translation = LocalOffset/InGeometry.Scale;
+		SetRenderTransform(WidgetTransform);
+
+		// FString Scale = FString::Printf(TEXT("%.0f"), InGeometry.Scale);
+		// UE_LOG(LogTemp, Warning, TEXT("Mouse: %s, CurrentWidgetScreenPos: %s, WidgetAbsoluteSize: %s NewTopLeft : %s LocalOffset : %s Scale = %s"), 
+		// 	   *MouseScreenPos.ToString(), 
+		// 	   *OriginWidgetScreenPos.ToString(), 
+		// 	   *WidgetAbsoluteSize.ToString(),
+		// 	   *NewTopLeft.ToString(),
+		// 	   *LocalOffset.ToString(),
+		// 	   *Scale
+		// 	   );
+        
+		return FReply::Handled();
+	}
+	else
+		return Super::NativeOnMouseMove(InGeometry, InMouseEvent);
+}

ProjectFish/Source/ProjectFish/Widget/DragableUserWidget.h

@@ -0,0 +1,37 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Blueprint/UserWidget.h"
+#include "DragableUserWidget.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class PROJECTFISH_API UDragableUserWidget : public UUserWidget
+{
+	GENERATED_BODY()
+
+public:
+	UFUNCTION(BlueprintCallable, Category = "Dragable Widget")
+	void SetWidgetDragable(bool Dragable);
+	UFUNCTION(BlueprintCallable, Category = "Dragable Widget")
+	void BeginDrag(const FGeometry& InGeometry);
+	UFUNCTION(BlueprintCallable, Category = "Dragable Widget")
+	void EndDrag();
+	
+
+	virtual FReply NativeOnMouseButtonDown( const FGeometry& InGeometry, const FPointerEvent& InMouseEvent ) override; 
+	virtual FReply NativeOnMouseButtonUp( const FGeometry& InGeometry, const FPointerEvent& InMouseEvent ) override;
+	virtual FReply NativeOnMouseMove( const FGeometry& InGeometry, const FPointerEvent& InMouseEvent ) override;
+protected:
+	UPROPERTY(BlueprintReadWrite, EditAnywhere)
+	bool bDragable;
+
+	UPROPERTY(BlueprintReadOnly)
+	bool bDraging;
+
+	FVector2D OriginWidgetScreenPos;
+};