123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
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/******************************************************************************
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* QSkinny - Copyright (C) 2016 Uwe Rathmann
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* This file may be used under the terms of the QSkinny License, Version 1.0
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*****************************************************************************/
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#ifndef QSK_OBJECT_TREE_H
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#define QSK_OBJECT_TREE_H 1
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#include "QskGlobal.h"
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#include "QskControl.h"
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#include "QskWindow.h"
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#include <QVariant>
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namespace QskObjectTree
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{
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class Visitor
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{
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public:
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virtual bool visitDown( QObject* object ) = 0;
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virtual bool visitUp( const QObject* object ) = 0;
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};
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QSK_EXPORT QObjectList childNodes( const QObject* );
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QSK_EXPORT QObject* parentNode( const QObject* );
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QSK_EXPORT bool isRoot( const QObject* );
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void traverseDown( QObject* object, Visitor& visitor );
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void traverseUp( QObject* object, Visitor& visitor );
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template< class T >
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class ResolveVisitor : public Visitor
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{
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public:
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ResolveVisitor( const char* propertyName ):
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m_propertyName( propertyName )
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{
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}
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inline const T& resolveValue() const
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{
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return m_value;
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}
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void setResolveValue( const T& value )
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{
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m_value = value;
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}
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virtual bool visitDown( QObject* object ) override final
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{
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if ( QskControl* control = qobject_cast< QskControl* >( object ) )
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return setImplicitValue( control, m_value );
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if ( QskWindow* window = qobject_cast< QskWindow* >( object ) )
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return setImplicitValue( window, m_value );
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return !setProperty( object, m_propertyName.constData(), m_value );
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}
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virtual bool visitUp( const QObject* object ) override final
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{
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if ( isRoot( object ) )
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return true;
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if ( const QskControl* control = qobject_cast< const QskControl* >( object ) )
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{
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m_value = value( control );
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return true;
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}
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if ( const QskWindow* window = qobject_cast< const QskWindow* >( object ) )
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{
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m_value = value( window );
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return true;
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}
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return getProperty( object, m_propertyName, m_value );
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}
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private:
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inline bool getProperty(
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const QObject* object, const char* name, T& value ) const
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{
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if ( !m_propertyName.isEmpty() )
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{
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const QVariant v = object->property( name );
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if ( v.canConvert< T >() )
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{
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value = qvariant_cast< T >( v );
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return true;
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}
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}
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return false;
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}
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inline bool setProperty(
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QObject* object, const char* name, const T& value ) const
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{
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T oldValue;
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if ( !getProperty( object, name, oldValue ) || oldValue == value )
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return false;
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object->setProperty( name, value );
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return true;
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}
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virtual bool setImplicitValue( QskControl*, const T& ) = 0;
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virtual bool setImplicitValue( QskWindow*, const T& ) = 0;
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virtual T value( const QskControl* ) const = 0;
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virtual T value( const QskWindow* ) const = 0;
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private:
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const QByteArray m_propertyName;
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T m_value;
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};
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}
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#endif
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