BindableWidget.cs

Siirry tämän tiedoston dokumentaatioon.

using System;
 
namespace Jypeli.Widgets
{
    public abstract class BindableWidget : Widget
    {
        private bool updateSet = false;
 
        public Meter Meter { get; private set; }
 
        public bool Bound { get; private set; }
 
        public BindableWidget( Animation animation )
            : base( animation )
        {
            CreateInnerMeter();
        }
 
        public BindableWidget( double width, double height )
            : base( width, height )
        {
            CreateInnerMeter();
        }
 
        public BindableWidget( double width, double height, Shape shape )
            : base( width, height, shape )
        {
            CreateInnerMeter();
        }
 
        public BindableWidget( ILayout layout )
            : base( layout )
        {
            CreateInnerMeter();
        }
 
        private void CreateInnerMeter()
        {
            Bound = false;
            UnsetChangedEvent();
            Meter = new DoubleMeter( 0, 0, 100 );
            SetChangedEvent();
            Game.AssertInitialized( UpdateValue );
        }
 
        protected void SetChangedEvent()
        {
            if ( updateSet ) return;
 
            if ( Meter is IntMeter ) ( (IntMeter)Meter ).Changed += UpdateIntValue;
            else if ( Meter is DoubleMeter ) ( (DoubleMeter)Meter ).Changed += UpdateDoubleValue;
            else throw new InvalidOperationException( "Meter is of unknown type!" );
 
            updateSet = true;
        }
 
        protected void UnsetChangedEvent()
        {
            if ( !updateSet ) return;
 
            if ( Meter is IntMeter ) ( (IntMeter)Meter ).Changed -= UpdateIntValue;
            else if ( Meter is DoubleMeter ) ( (DoubleMeter)Meter ).Changed -= UpdateDoubleValue;
            else throw new InvalidOperationException( "Meter is of unknown type!" );
 
            updateSet = false;
        }
 
        public virtual void BindTo( Meter meter )
        {
            UnsetChangedEvent();
            Meter = meter;
            Bound = true;
            SetChangedEvent();
            UpdateValue();
        }
 
        public virtual void Unbind()
        {
            CreateInnerMeter();
        }
 
        private void UpdateIntValue( int oldValue, int newValue )
        {
            UpdateValue();
        }
 
        private void UpdateDoubleValue( double oldValue, double newValue )
        {
            UpdateValue();
        }
 
        protected abstract void UpdateValue();
    }
}