73 lines
2.3 KiB
C
73 lines
2.3 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 __GUI_EXPRESSION_H__
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#define __GUI_EXPRESSION_H__
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#include <NsCore/Noesis.h>
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#include <NsGui/DependencySystemApi.h>
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#include <NsCore/BaseComponent.h>
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#include <NsCore/ReflectionDeclare.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 DependencyObject;
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class DependencyProperty;
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////////////////////////////////////////////////////////////////////////////////////////////////////
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enum BeforeSetAction
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{
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/// Execute method and delete expression (updating cached value). This is the common return
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/// value for expressions that do not require the BeforeSet call
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BeforeSetAction_Delete = 0,
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BeforeSetAction_Default = 0,
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/// Execute method and update cached value (keep expression)
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BeforeSetAction_Maintain = 1
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};
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NS_WARNING_PUSH
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NS_MSVC_WARNING_DISABLE(4251 4275)
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Base implementation for all expressions.
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///
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/// https://msdn.microsoft.com/en-us/library/system.windows.expression.aspx
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////////////////////////////////////////////////////////////////////////////////////////////////////
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class NS_GUI_DEPENDENCYSYSTEM_API Expression: public BaseComponent
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{
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public:
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Expression();
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virtual ~Expression();
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/// Evaluates expression when applied to the specified target object
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virtual Ptr<BaseComponent> Evaluate() const;
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/// Applies expression to a new target, cloning the expression itself if necessary
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virtual Ptr<Expression> Reapply(DependencyObject* targetObject,
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const DependencyProperty* targetProperty) const;
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/// Executes the set
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virtual BeforeSetAction BeforeSet(DependencyObject* obj, const DependencyProperty* dp,
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const void* value, bool valueHasChanged);
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/// Executed after set is completed and the property changed has been notified
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virtual void AfterSet(DependencyObject* obj, const DependencyProperty* dp,
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const void* value, bool valueHasChanged);
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NS_DECLARE_REFLECTION(Expression, BaseComponent)
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};
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NS_WARNING_POP
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}
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#endif
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