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using System;
namespace Xamarin.Forms
{
public abstract class Condition
{
Action<BindableObject, bool, bool> _conditionChanged;
bool _isSealed;
internal Condition()
{
}
internal Action<BindableObject, bool, bool> ConditionChanged
{
get { return _conditionChanged; }
set
{
if (_conditionChanged == value)
return;
if (_conditionChanged != null)
throw new InvalidOperationException("The same condition instance can not be reused");
_conditionChanged = value;
}
}
internal bool IsSealed
{
get { return _isSealed; }
set
{
if (_isSealed == value)
return;
if (!value)
throw new InvalidOperationException("What is sealed can not be unsealed.");
_isSealed = value;
OnSealed();
}
}
internal abstract bool GetState(BindableObject bindable);
internal virtual void OnSealed()
{
}
internal abstract void SetUp(BindableObject bindable);
internal abstract void TearDown(BindableObject bindable);
}
}
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