54 lines
2.0 KiB
C
54 lines
2.0 KiB
C
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// NoesisGUI - http://www.noesisengine.com
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// Copyright (c) 2013 Noesis Technologies S.L. All Rights Reserved.
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////////////////////////////////////////////////////////////////////////////////////////////////////
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#ifndef __CORE_IVALUECONVERTER_H__
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#define __CORE_IVALUECONVERTER_H__
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#include <NsCore/Noesis.h>
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#include <NsCore/Interface.h>
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namespace Noesis
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{
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template<class T> class Ptr;
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class BaseComponent;
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Provides a way to apply custom logic to a binding.
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////////////////////////////////////////////////////////////////////////////////////////////////////
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NS_INTERFACE IValueConverter: public Interface
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{
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/// The data binding engine calls this method when it propagates a value from the binding
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/// source to the binding target.
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///
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/// Return *DependencyProperty.UnsetValue* to indicate that the converter produced no value and
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/// that the fallback (if available) or default value should be used instead.
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///
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/// Return *Binding.DoNothing* to indicate that the binding should not transfer the value or use
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/// the fallback or default value.
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virtual bool TryConvert(BaseComponent* value, const Type* targetType, BaseComponent* parameter,
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Ptr<BaseComponent>& result) = 0;
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/// The data binding engine calls this method when it propagates a value from the binding
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/// target to the binding source.
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///
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/// Return *Binding.DoNothing* to indicate that no value should be set on the source property.
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///
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/// Return *DependencyProperty.UnsetValue* to indicate that the converter is unable to provide
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/// a value for the source property, and no value will be set to it.
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virtual bool TryConvertBack(BaseComponent* value, const Type* targetType,
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BaseComponent* parameter, Ptr<BaseComponent>& result) = 0;
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NS_IMPLEMENT_INLINE_REFLECTION_(IValueConverter, Interface)
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};
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}
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#endif
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