231 lines
8.0 KiB
C++
231 lines
8.0 KiB
C++
/*
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* Copyright (C) 2005 by Aaron Seigo <aseigo@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License version 2 as
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* published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef PLASMA_APPLET_H
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#define PLASMA_APPLET_H
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#include <QtGui/QGraphicsItemGroup>
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#include <QtGui/QWidget>
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#include <KPluginInfo>
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#include <KSharedConfig>
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#include <KGenericFactory>
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#include <plasma.h>
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#include <dataengine.h>
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namespace Plasma
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{
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/**
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* @short The base Applet (Plasmoid) class
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*
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*
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*/
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class PLASMA_EXPORT Applet : public QObject, public QGraphicsItemGroup
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{
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Q_OBJECT
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public:
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typedef QList<Applet*> List;
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typedef QHash<QString, Applet*> Dict;
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/**
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* @arg parent the QGraphicsItem this applet is parented to
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* @arg servideId the name of the .desktop file containing the
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* information about the widget
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* @arg appletId a unique id used to differentiate between multiple
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* instances of the same Applet type
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*/
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Applet(QGraphicsItem* parent,
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const QString& serviceId,
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int appletId);
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/**
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* This constructor is to be used with the plugin loading systems
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* found in KPluginInfo and KService. The argument list is expected
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* to have two elements: the KService service ID for the desktop entry
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* and an applet ID which must be a base 10 number.
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*
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* @arg parent a QObject parent; you probably want to pass in 0
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* @arg args a list of strings containing two entries: the service id
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* and the applet id
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*/
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Applet(QObject* parent, const QStringList& args);
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~Applet();
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/**
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* Returns the KConfigGroup to access the applets configuration.
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*
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* This config object will write to an instance
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* specific config file named \<appletname\>\<instanceid\>rc
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* in the Plasma appdata directory.
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**/
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KConfigGroup appletConfig() const;
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/**
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* Returns a KConfigGroup object to be shared by all applets of this
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* type.
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*
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* This config object will write to an applet-specific config object
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* named plasma_\<appletname\>rc in the local config directory.
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*/
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KConfigGroup globalAppletConfig() const;
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/**
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* Ensures that the DataEngine named name is loaded and ready to be used
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*
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* @return returns true on success, false on failure
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*/
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bool loadDataEngine( const QString& name );
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/**
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* called when any of the geometry constraints have been updated
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* this is always called prior to painting and should be used as an
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* opportunity to layout the widget, calculate sizings, etc.
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*
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* Do not call update() from this method; an update() will be triggered
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* at the appropriate time for the applet.
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*
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* @property constraint
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*/
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virtual void constraintsUpdated();
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/**
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* Returns the current form factor the applet is being displayed in.
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* @see Plasma::FormFactor
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*/
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FormFactor formFactor() const;
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/**
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* Returns the location of the scene which is displaying applet.
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* @see Plasma::Location
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*/
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Location location() const;
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/**
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* Returns a maximum size hint based on the Corona's space availability
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* An applet may choose to violate this size hint, but should try and
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* respect it as much as possible.
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*/
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QRectF maxSizeHint() const;
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/**
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* Returns a list of all known applets in a hash keyed by a unique
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* identifier for each applet
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*
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* @return list of applets
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**/
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static KPluginInfo::List knownApplets();
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/**
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* Reimplement this slot to show a configuration dialog and let the user
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* play with the plasmoid options. Called when the user selects the configure entry
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* from the contextual menu.
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*/
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virtual void configureDialog(){}; //default implementation is empty
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/**
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* Attempts to load an applet, returning a pointer to the applet if
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* successful. The caller takes responsibility for the applet, including
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* deleting it when no longer needed.
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*
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* @param name the plugin name, as returned by KPluginInfo::pluginName()
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* @param applet unique ID to assign the applet, or zero to have one
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* assigned automatically.
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* @return a pointer to the loaded applet, or 0 on load failure
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**/
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static Applet* loadApplet(const QString &name, uint appletId = 0);
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/**
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* Attempts to load an applet, returning a pointer to the applet if
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* successful. The caller takes responsibility for the applet, including
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* deleting it when no longer needed.
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*
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* @param info KPluginInfo object for the desired applet
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* @param applet unique ID to assign the applet, or zero to have one
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* assigned automatically.
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* @return a pointer to the loaded applet, or 0 on load failure
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**/
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static Applet* loadApplet(const KPluginInfo* info, uint appletId = 0);
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Q_SIGNALS:
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/**
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* Emit this signal when your applet needs to take (or lose) keyboard
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* focus. This ensures that autohiding elements stay unhidden and other
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* bits of bookkeeping are performed to ensure proper function.
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*
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* If you call watchForFocus on your applet, then this is handled for
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* the applet and it is not necessary to emit the signal directly.
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*
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* @param focus true if the applet is taking keyboard focus, false if
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* it is giving it up
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**/
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void requestFocus( bool focus );
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protected:
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/**
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* Returns the name of the applet. This will be the same for all
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* instances of this applet.
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**/
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QString globalName() const;
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/**
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* Returns a name unique to the insane of this applet. Useful for
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* being able to refer directly to a particular applet. Combines the
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* global name with the applet id
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**/
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QString instanceName() const;
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/**
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* Register widgets that can receive keyboard focus with this method
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* This call results in an eventFilter being places on the widget.
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* @param widget the widget to watch for keyboard focus
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* @param watch whether to start watching the widget, or to stop doing so
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*/
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void watchForFocus( QObject *widget, bool watch = true );
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/**
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* Call this whenever focus is needed or not needed. You do not have to
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* call this method for widgets that have been registered with
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* watchForFocus
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* @see watchForFocus
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* @param focus whether to or not to request focus
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*/
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void needsFocus( bool focus );
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/**
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* @internal event filter; used for focus watching
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**/
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bool eventFilter( QObject *o, QEvent *e );
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private:
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class Private;
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Private* const d;
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};
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} // Plasma namespace
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#define K_EXPORT_PLASMA_APPLET(libname, classname) \
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K_EXPORT_COMPONENT_FACTORY( \
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plasma_applet_##libname, \
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KGenericFactory<classname>("plasma_applet_" #libname))
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#endif // multiple inclusion guard
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