// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "SChildWindowTitleBar.h"
#include "SCompoundWidget.h"
#include "SConstraintCanvas.h"

class IChildWindow;
class SChildWindowTitleBar;
class SNativeChildWindow;
class SHorizontalBox;

/**
 * 
 */
class ARONA_API SChildWindow : public SCompoundWidget
{
public:
	SLATE_BEGIN_ARGS(SChildWindow):
		_Title(),
		_BorderSize(2),
		_ResizeHandleSize(16)
		{
		}
	

	SLATE_ARGUMENT(TSharedPtr<IChildWindow>, Content)
	SLATE_ARGUMENT(FString, Title)
	SLATE_ARGUMENT(FVector2D, BorderSize)
	SLATE_ARGUMENT(bool, IsSingletonWindow)
	SLATE_ARGUMENT(FVector2D, ResizeHandleSize)

	SLATE_EVENT(FSimpleDelegate, OnClose)
	SLATE_EVENT(FWindowVector2fEvent, OnWindowMove)
	SLATE_EVENT(FWindowVector2fEvent, OnWindowResize)
	SLATE_END_ARGS()

	/** Constructs this widget with InArgs */
	void Construct(const FArguments& InArgs, SConstraintCanvas::FSlot* InSlot);

	virtual FReply OnMouseButtonDown(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;
	virtual FReply OnMouseButtonUp(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;
	virtual FReply OnMouseMove(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;

	void MoveWindow(FVector2f Position); // 相对于父窗口的位置
	static float GetTitleBarHeight();
	void MoveWindowDelta(FVector2f Delta);
	void ResizeWindow(FVector2f Size); // 相对于父窗口的大小

	SConstraintCanvas::FSlot* GetSlot() const { return Slot; }

	FVector2f GetWindowSize() const { return Slot->GetOffset().GetDesiredSize2f(); }
	void SetOnWindowResize(FWindowVector2fEvent InOnWindowResize) { OnWindowResize = InOnWindowResize; }
	FWindowVector2fEvent& GetOnWindowResize() { return OnWindowResize; }
	void OnMaximize(bool bArg);

	TSharedPtr<IChildWindow> Content;
private:
	void OnCloseClicked();
	SConstraintCanvas::FSlot* Slot = nullptr;
	FSimpleDelegate OnClose;
	FWindowVector2fEvent OnWindowMove;
	FWindowVector2fEvent OnWindowResize;
	FVector2D BorderSize;
	FVector2D ResizeHandleSize;
	FVector2D BeginResizePos;
	FMargin LastMargin;
	FMargin BeginResizeMargin;
	bool IsSingletonWindow = false;
	bool IsOnResize = false;
	
	TSharedPtr<SChildWindowTitleBar> TitleBar;
};