UIScroller.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "UIControl.hpp"
 
namespace CeresEngine {
 
    class UIScrollView;
 
    class UIScroller : public UIControl {
        using super = UIControl;
 
    private:
        double mValue = 0.0;
 
        double mRelativeSize = 0.0;
 
        bool mVertical = true;
 
    private:
        struct DragState {
            UIPoint startPoint;
 
            double startValue;
        };
 
        Optional<DragState> mDragState;
 
    public:
        Event<void()> didScroll;
 
    public:
        explicit UIScroller();
        explicit UIScroller(bool isVertical);
 
    public:
        [[nodiscard]] double getValue() const noexcept { return mValue; }
 
        [[nodiscard]] double getRelativeSize() const noexcept { return mRelativeSize; }
 
        void setValueAndSize(double value, double relativeSize);
 
    public:
        void draw(UIGraphicsContext& context, const UIRect& dirtyRect) override;
 
    public: // UIResponder
        void mouseDown(const UIMouseEvent& event) override;
 
        void mouseUp(const UIMouseEvent& event) override;
 
        void mouseDragged(const CeresEngine::UIMouseEvent &event) override;
 
    protected:
        virtual UIRect getKnobSlotRect() const;
 
        virtual UIRect getKnobRect() const;
 
        virtual void drawKnob(UIGraphicsContext& context, const UIRect& knobRect);
 
        virtual void drawKnobSlot(UIGraphicsContext& context, const UIRect& knobSlotRect);
 
    public:
        static const UIFloatAppearanceProperty scrollerSizeProperty;
 
        static const UIColorAppearanceProperty scrollerSlotColorProperty;
 
        static const UIFloatAppearanceProperty scrollerSlotRadiusProperty;
 
        static const UIColorAppearanceProperty scrollerKnobColorProperty;
 
        static const UIFloatAppearanceProperty scrollerKnobRadiusProperty;
    };
 
} // namespace CeresEngine