TwoStateControl.h

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#pragma once
 
namespace Gorgon { namespace UI {
    
    class TwoStateControl {
    public:
        TwoStateControl() : StateChangingEvent(this) { }
        
        virtual ~TwoStateControl() { }
        
        TwoStateControl &operator =(bool value) { SetState(value); return *this; }
        
        explicit operator bool() const { return GetState(); }
        
        bool operator !() const { return !GetState(); }
        
        bool Check() { return SetState(true); }
        
        bool Clear() { return SetState(false); }
        
        bool ForceCheck() { return SetState(true, true); }
        
        bool ForceClear() { return SetState(false, true); }
        
        bool Toggle() { return SetState(!GetState()); }
        
        virtual bool GetState() const = 0;
        
        virtual bool SetState(bool value, bool force = false) = 0;
        
        Event<TwoStateControl, bool /*new state*/, bool & /* allow */> StateChangingEvent;
        
    protected:
        
    };
 
} }