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/*
This file is part of the KDE libraries
Copyright (c) 1999 Matthias Hoelzer-Kluepfel <[email protected]>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef KCMODULE_H
#define KCMODULE_H
#include <qwidget.h>
#include <kdelibs_export.h>
class QStringList;
class KAboutData;
class KConfigDialogManager;
class KConfigSkeleton;
class KCModulePrivate;
class KInstance;
/**
* The base class for control center modules.
*
* Starting from KDE 2.0, control center modules are realized as shared
* libraries that are loaded into the control center at runtime.
*
* The module in principle is a simple widget displaying the
* item to be changed. The module has a very small interface.
*
* All the necessary glue logic and the GUI bells and whistles
* are provided by the control center and must not concern
* the module author.
*
* To write a config module, you have to create a library
* that contains at one factory function like this:
*
* \code
* #include <kgenericfactory.h>
*
* typedef KGenericFactory<YourKCModule, QWidget> YourKCModuleFactory;
* K_EXPORT_COMPONENT_FACTORY( yourLibName, YourKCModuleFactory("name_of_the_po_file") );
* \endcode
*
* The parameter "name_of_the_po_file" has to correspond with the messages target
* that you created in your Makefile.am.
*
* See http://developer.kde.org/documentation/other/kcm_howto.html
* for more detailed documentation.
*
* @author Matthias Hoelzer-Kluepfel <[email protected]>
*/
class KDEUI_EXPORT KCModule : public QWidget
{
Q_OBJECT
public:
/**
* An enumeration type for the buttons used by this module.
* You should only use Help, Default and Apply. The rest is obsolete.
*
* @see KCModule::buttons @see KCModule::setButtons
*/
enum Button {Help=1, Default=2, Apply=16,
Reset=4, /* obsolete, do not use! */
Cancel=8, /* obsolete, do not use! */
Ok=32, /* obsolete, do not use! */
SysDefault=64 /* obsolete, do not use! */ };
/*
* Base class for all KControlModules.
* Make sure you have a QStringList argument in your
* implementation.
*/
KCModule(QWidget *parent=0, const char *name=0, const QStringList &args=QStringList() );
KCModule(KInstance *instance, QWidget *parent=0, const QStringList &args=QStringList() );
/*
* Destroys the module.
*/
~KCModule();
/**
* Load the configuration data into the module.
*
* The load method sets the user interface elements of the
* module to reflect the current settings stored in the
* configuration files.
*
* This method is invoked whenever the module should read its configuration
* (most of the times from a config file) and update the user interface.
* This happens when the user clicks the "Reset" button in the control
* center, to undo all of his changes and restore the currently valid
* settings.
*
* If you use KConfigXT, loading is taken care of automatically and
* you do not need to do it manually. However, if you for some reason reimplement it and
* also are using KConfigXT, you must call this function otherwise the loading of KConfigXT
* options will not work.
*
*/
virtual void load();
// ### KDE 4: Call load() automatically through a single-shot timer
// from the constructor // and change documentation
/**
* Save the configuration data.
*
* The save method stores the config information as shown
* in the user interface in the config files.
*
* If necessary, this method also updates the running system,
* e.g. by restarting applications. This normally does not apply for
* KSettings::Dialog modules where the updating is taken care of by
* KSettings::Dispatcher.
*
* save is called when the user clicks "Apply" or "Ok".
*
* If you use KConfigXT, saving is taken care off automatically and
* you do not need to load manually. However, if you for some reason reimplement it and
* also are using KConfigXT, you must call this function, otherwise the saving of KConfigXT
* options will not work. Call it at the very end of your reimplementation, to avoid
* changed() signals getting emitted when you modify widgets.
*/
virtual void save();
/**
* Sets the configuration to sensible default values.
*
* This method is called when the user clicks the "Default"
* button. It should set the display to useful values.
*
* If you use KConfigXT, you do not have to reimplement this function since
* the fetching and settings of default values is done automatically. However, if you
* reimplement and also are using KConfigXT, remember to call the base function at the
* very end of your reimplementation.
*/
virtual void defaults();
/**
* Set the configuration to system default values.
*
* This method is called when the user clicks the "System-Default"
* button. It should set the display to the system default values.
*
* @note The default behavior is to call defaults().
*/
virtual void sysdefaults() { defaults(); }
// KDE 4 deprecate
/**
* Return a quick-help text.
*
* This method is called when the module is docked.
* The quick-help text should contain a short description of the module and
* links to the module's help files. You can use QML formatting tags in the text.
*
* @note make sure the quick help text gets translated (use i18n()).
*/
virtual QString quickHelp() const;
/**
* This is generally only called for the KBugReport.
* If you override you should have it return a pointer to a constant.
*
*
* @returns the KAboutData for this module
*/
virtual const KAboutData *aboutData() const;
/**
* This sets the KAboutData returned by aboutData()
* @since 3.3
*/
void setAboutData( KAboutData* about );
/**
* Indicate which buttons will be used.
*
* The return value is a value or'ed together from
* the Button enumeration type.
*
* @see KCModule::setButtons
*/
int buttons() const { return _btn; }
/**
* Get the RootOnly message for this module.
*
* When the module must be run as root, or acts differently
* for root and a normal user, it is sometimes useful to
* customize the message that appears at the top of the module
* when used as a normal user. This function returns this
* customized message. If none has been set, a default message
* will be used.
*
* @see KCModule::setRootOnlyMsg
*/
QString rootOnlyMsg() const;
/**
* Tell if KControl should show a RootOnly message when run as
* a normal user.
*
* In some cases, the module don't want a RootOnly message to
* appear (for example if it has already one). This function
* tells KControl if a RootOnly message should be shown
*
* @see KCModule::setUseRootOnlyMsg
*/
bool useRootOnlyMsg() const;
KInstance *instance() const;
/**
* @return a list of @ref KConfigDialogManager's in use, if any.
* @since 3.4
*/
const QPtrList<KConfigDialogManager>& configs() const;
protected:
/**
* Adds a KConfigskeleton @p config to watch the widget @p widget
*
* This function is useful if you need to handle multiple configuration files.
*
* @since 3.3
* @return a pointer to the KConfigDialogManager in use
* @param config the KConfigSkeleton to use
* @param widget the widget to watch
*/
KConfigDialogManager* addConfig( KConfigSkeleton *config, QWidget* widget );
/**
* Sets the quick help.
*
* @since 3.3
*/
void setQuickHelp( const QString& help );
signals:
/**
* Indicate that the state of the modules contents has changed.
*
* This signal is emitted whenever the state of the configuration
* shown in the module changes. It allows the control center to
* keep track of unsaved changes.
*/
void changed(bool state);
/**
* Indicate that the module's quickhelp has changed.
*
* Emit this signal whenever the module's quickhelp changes.
* Modules implemented as tabbed dialogs might want to implement
* per-tab quickhelp for example.
*
*/
void quickHelpChanged();
protected slots:
/**
* Calling this slot is equivalent to emitting changed(true).
* @since 3.3
*/
void changed();
/**
* A managed widget was changed, the widget settings and the current
* settings are compared and a corresponding changed() signal is emitted
* @since 3.4
*/
void widgetChanged();
protected:
/**
* Sets the buttons to display.
*
* Help: shows a "Help" button.
* Default: shows a "Use Defaults" button
* Apply: in kcontrol this will show an "Apply" and "Reset" button
* in kcmshell this will show an "Ok", "Apply" and "Cancel" button
*
* If Apply is not specified, kcmshell will show a "Close" button.
*
* @see KCModule::buttons
*/
void setButtons(int btn) { _btn = btn; }
/**
* Sets the RootOnly message.
*
* This message will be shown at the top of the module of the
* corresponding desktop file contains the line X-KDE-RootOnly=true.
* If no message is set, a default one will be used.
*
* @see KCModule::rootOnlyMsg
*/
void setRootOnlyMsg(const QString& msg);
/**
* Change whether or not the RootOnly message should be shown.
*
* Following the value of @p on, the RootOnly message will be
* shown or not.
*
* @see KCModule::useRootOnlyMsg
*/
void setUseRootOnlyMsg(bool on);
/**
* Returns the changed state of automatically managed widgets in this dialog
* @since 3.5
*/
bool managedWidgetChangeState() const;
/**
* Call this method when your manually managed widgets change state between
* changed and not changed
* @since 3.5
*/
void unmanagedWidgetChangeState(bool);
private:
int _btn;
protected:
virtual void virtual_hook( int id, void* data );
private:
KCModulePrivate *d;
/**
* Internal function for initialization of the class.
*/
void init();
};
#endif //KCMODULE_H
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