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

#pragma once

#include "CoreMinimal.h"
#include "SLeafWidget.h"

class FPluginHost;
/**
 * 
 */
class ARONA_API SPianoKey : public SLeafWidget
{
public:
	SLATE_BEGIN_ARGS(SPianoKey)
		{
		}
	SLATE_ATTRIBUTE(float, KeyHeight)
	SLATE_ATTRIBUTE(float, KeyWidth)

	SLATE_END_ARGS()

	/** Constructs this widget with InArgs */
	void Construct(const FArguments& InArgs, FPluginHost* InPluginHost);


	virtual int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const override;
	virtual FVector2D ComputeDesiredSize(float LayoutScaleMultiplier) const override;

	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;
private:
	int32 HeightToNoteNumber(float Height) const;
	float WidthToVelocity(float Width) const;

	int32 LastNoteNumber = -1;
	FPluginHost* PluginHost = nullptr;
	TAttribute<float> KeyHeight; // 白键高度
	TAttribute<float> KeyWidth;
};