tdebase/twin/lib/kdecorationfactory.h

/*****************************************************************
This file is part of the KDE project.

Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>

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******************************************************************/

#ifndef KDECORATIONFACTORY_H
#define KDECORATIONFACTORY_H

#include "kdecoration.h"

class KDecoration;
class KDecorationBridge;
class KDecorationFactoryPrivate;

class KWIN_EXPORT KDecorationFactory
    : public KDecorationDefines
    {
    public:
	/**
	 * Constructor. Called after loading the decoration plugin. All global
	 * initialization of the plugin should be done in the factory constructor.
	 */
        KDecorationFactory();
	/**
	 * Destructor. Called before unloading the decoration plugin. All global
	 * cleanup of the plugin should be done in the factory destructor.
	 */
        virtual ~KDecorationFactory();
	/**
	 * This function must be reimplemented to create decoration objects.
	 * The argument should be passed to the KDecoration constructor, the second
	 * KDecoration argument should be this factory object.
	 */
        virtual KDecoration* createDecoration( KDecorationBridge* bridge ) = 0;
	/**
	 * This function is called when the configuration settings changed.
	 * The argument specifies what has changed, using the SettingXXX masks.
	 * It should be determined whether the decorations need to be completely
	 * remade, in which case true should be returned, or whether only e.g.
	 * a repaint will be sufficient, in which case false should be returned,
	 * and resetDecorations() can be called to reset all decoration objects.
	 * Note that true should be returned only when really necessary.
	 */
        virtual bool reset( unsigned long changed ); // returns true if the decoration needs to be recreated

        /**
         * Reimplement this function if your decoration supports more border sizes than
         * the default one (BorderNormal). The returned list must contain all supported
         * sizes, ordered from the smallest to the largest one. By default, only
         * BorderNormal is returned.
         */        
        virtual TQValueList< BorderSize > borderSizes() const;

        virtual bool supports( Ability ability );
        
        virtual void checkRequirements( KDecorationProvides* provides );
	/**
	 * Returns the KDecorationOptions object, which is used to access
	 * configuration settings for the decoration.
	 */
        const KDecorationOptions* options(); // convenience
        /**
         * Returns true if the given decoration object still exists. This is necessary
         * e.g. when calling KDecoration::showWindowMenu(), which may cause the decoration
         * to be destroyed. Note that this function is reliable only if called immediately
         * after such actions.
         */
        bool exists( const KDecoration* deco ) const;
        /**
         * @internal
         */
        void addDecoration( KDecoration* );
        /**
         * @internal
         */
        void removeDecoration( KDecoration* );
    protected:
	/**
	 * Convenience function that calls KDecoration::reset() for all decoration
	 * objects.
	 */
        void resetDecorations( unsigned long changed ); // convenience
        /**
         * This function has the same functionality like KDecoration::windowType().
         * It can be used in createDecoration() to return different KDecoration
         * inherited classes depending on the window type, as at that time
         * KDecoration::windowType() is not available yet. The additional argument
         * is the one passed to createDecoration().
         */
        NET::WindowType windowType( unsigned long supported_types, KDecorationBridge* bridge ) const;
    private:
        TQValueList< KDecoration* > _decorations;
        KDecorationFactoryPrivate* d;
    };
    
inline const KDecorationOptions* KDecorationFactory::options()
    {
    return KDecoration::options();
    }
    
#endif