EM_Task/TraceInsights/Public/Insights/ViewModels/TooltipDrawState.h

// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "Fonts/SlateFontInfo.h"
#include "Math/Color.h"

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struct FDrawContext;
struct FSlateBrush;

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class TRACEINSIGHTS_API FTooltipDrawState
{
public:
    static constexpr float BorderX            = 6.0f;
    static constexpr float BorderY            = 3.0f;
    static constexpr float MinWidth           = 128.0f;
    static constexpr float MinHeight          = 0.0f;

    static constexpr float DefaultTitleHeight = 14.0f;
    static constexpr float DefaultLineHeight  = 14.0f;
    static constexpr float NameValueDX        = 2.0f;

    static FLinearColor DefaultTitleColor;
    static FLinearColor DefaultNameColor;
    static FLinearColor DefaultValueColor;

private:
    enum class FDrawTextType
    {
        Misc,
        Title,
        Name,   // X is computed at Draw (right aligned at ValueOffsetX)
        Value,  // X is computed at Draw (left aligned at ValueOffsetX + NameValueDX)
    };

    struct FDrawTextInfo
    {
        float X;  // relative X position of text inside tooltip
        float Y;  // relative Y position of text inside tooltip
        FVector2D TextSize;
        FString Text;
        FLinearColor Color;
        FDrawTextType Type;
    };

public:
    FTooltipDrawState();
    ~FTooltipDrawState();

    void Reset();

    void ResetContent();
    void AddTitle(const FString& Title);
    void AddTitle(const FString& Title, const FLinearColor& Color);
    void AddNameValueTextLine(const FString& Name, const FString& Value);
    void AddTextLine(const FString& Text, const FLinearColor& Color);
    void AddTextLine(const float X, const float Y, const FString& Text, const FLinearColor& Color);
    void UpdateLayout();  // updates ValueOffsetX and DesiredSize

    const FLinearColor& GetBackgroundColor() const { return BackgroundColor; }
    void SetBackgroundColor(const FLinearColor& InBackgroundColor) { BackgroundColor = InBackgroundColor; }

    float GetOpacity() const { return Opacity; }
    void SetOpacity(const float InOpacity) { Opacity = InOpacity; }

    float GetDesiredOpacity() const { return DesiredOpacity; }
    void SetDesiredOpacity(const float InDesiredOpacity) { DesiredOpacity = InDesiredOpacity; }

    const FVector2D& GetSize() const { return Size; }
    const FVector2D& GetDesiredSize() const { return DesiredSize; }

    void Update();  // updates current Opacity and Size

    const FVector2D& GetPosition() const { return Position; }
    void SetPosition(const FVector2D& MousePosition, const float MinX, const float MaxX, const float MinY, const float MaxY);
    void SetPosition(const float PosX, const float PosY)
    {
        Position.X = PosX;
        Position.Y = PosY;
    }

    void Draw(const FDrawContext& DrawContext) const;

private:
    const FSlateBrush* WhiteBrush;
    const FSlateFontInfo Font;

    FLinearColor BackgroundColor;

    FVector2D Size;
    FVector2D DesiredSize;

    FVector2D Position;

    float ValueOffsetX;
    float NewLineY;

    float Opacity;
    float DesiredOpacity;

    TArray<FDrawTextInfo> Texts;
};

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