plasma-framework/containment.h

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/*
* Copyright 2007 by Aaron Seigo <aseigo@kde.org>
*
* This program 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, or
* (at your option) any later version.
*
* This program 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 General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef PLASMA_CONTAINMENT_H
#define PLASMA_CONTAINMENT_H
#include <QtGui/QGraphicsItem>
#include <QtGui/QWidget>
#include <kplugininfo.h>
#include <ksharedconfig.h>
#include <kgenericfactory.h>
#include <plasma/applet.h>
namespace Plasma
{
class DataEngine;
class Package;
/**
* @short The base class for plugins that provide backgrounds and applet grouping containers
*
* Containment objects provide the means to group applets into functional sets.
* They also provide the following:
*
* - drawing of the background image (which can be interactive)
* - form factors (e.g. panel, desktop, full screen, etc)
* - applet layout management
*
* Since containment is actually just a Plasma::Applet, all the techniques used
* for writing the visual presentation of Applets is applicable to Containtments.
* Containments are differentiated from Applets by being marked with the ServiceType
* of Plasma/Containment. Plugins registered with both the Applet and the Containment
* ServiceTypes can be loaded for us in either situation.
*
* See techbase.kde.org for a tutorial on writing Containments using this class.
*/
class PLASMA_EXPORT Containment : public Applet
{
Q_OBJECT
public:
typedef QList<Applet*> List;
typedef QHash<QString, Applet*> Dict;
enum Type { DesktopContainment = 0 /**< A desktop containment */,
PanelContainment /**< A desktop panel */
};
/**
* @arg parent the QGraphicsItem this applet is parented to
* @arg servideId the name of the .desktop file containing the
* information about the widget
* @arg appletId a unique id used to differentiate between multiple
* instances of the same Applet type
*/
explicit Containment(QGraphicsItem* parent = 0,
const QString& serviceId = QString(),
uint containmentId = 0);
/**
* This constructor is to be used with the plugin loading systems
* found in KPluginInfo and KService. The argument list is expected
* to have two elements: the KService service ID for the desktop entry
* and an applet ID which must be a base 10 number.
*
* @arg parent a QObject parent; you probably want to pass in 0
* @arg args a list of strings containing two entries: the service id
* and the applet id
*/
Containment(QObject* parent, const QVariantList& args);
~Containment();
/**
* Reimplemented from Applet
*/
void init();
/**
* Returns the type of containment
*/
virtual Type type();
/**
* Paints a default background image. Nothing fancy, but that's what plugins
* are for. Reimplemented from Applet;
*/
void paintInterface(QPainter *painter,
const QStyleOptionGraphicsItem *option,
const QRect& contentsRect);
/**
* Returns the current form factor the applets in this Containment
* are being displayed in.
*
* @see Plasma::FormFactor
*/
FormFactor formFactor() const;
/**
* Returns the location of this Containment
*
* @see Plasma::Location
*/
Location location() const;
/**
* Returns a list of all known containments.
*
* @param category Only applets matchin this category will be returned.
* Useful in conjunction with knownCategories.
* If "Misc" is passed in, then applets without a
* Categories= entry are also returned.
* If an empty string is passed in, all applets are
* returned.
* @param parentApp the application to filter applets on. Uses the
* X-KDE-ParentApp entry (if any) in the plugin info.
* The default value of QString() will result in a
* list containing only applets not specifically
* registered to an application.
* @return list of applets
**/
static KPluginInfo::List knownContainments(const QString &category = QString(),
const QString &parentApp = QString());
/**
* Returns a list of all known applets associated with a certain mimetype
*
* @return list of applets
**/
static KPluginInfo::List knownContainmentsForMimetype(const QString &mimetype);
/**
* Adds an applet to this Containment
*
* @param name the plugin name for the applet, as given by
* KPluginInfo::pluginName()
* @param args argument list to pass to the plasmoid
* @param id to assign to this applet, or 0 to auto-assign it a new id
* @param geometry where to place the applet, or to auto-place it if an invalid
* is provided
* @param delayedInit if true, init() will not be called on the applet
*
* @return a pointer to the applet on success, or 0 on failure
*/
Applet* addApplet(const QString& name, const QVariantList& args = QVariantList(),
uint id = 0, const QRectF &geometry = QRectF(-1, -1, -1, -1),
bool delayedInit = false);
/**
* @return the applets currently in this Containment
*/
Applet::List applets() const;
/**
* Removes all applets from this Containment
*/
void clearApplets();
/**
* Sets the physical screen this Containment is associated with.
*
* @param screen the screen number this containment is the desktop for, or -1
* if it is not serving as the desktop for any screen
*/
void setScreen(int screen);
/**
* @return the screen number this containment is serving as the desktop for
* or -1 if none
*/
int screen() const;
/**
* @internal
*/
void saveConstraints(KConfigGroup* group) const;
/**
* @internal
*/
void initConstraints(KConfigGroup* group);
/**
* Reimplemented from Applet
*/
QSizeF contentSizeHint() const;
public Q_SLOTS:
/**
* Informs the Corona as to what position it is in. This is informational
* only, as the Corona doesn't change it's actual location. This is,
* however, passed on to Applets that may be managed by this Corona.
*
* @param location the new location of this Corona
*/
void setLocation(Plasma::Location location);
/**
* Sets the form factor for this Corona. This may cause changes in both
* the arrangement of Applets as well as the display choices of individual
* Applets.
*/
void setFormFactor(Plasma::FormFactor formFactor);
protected:
void contextMenuEvent(QGraphicsSceneContextMenuEvent * event);
protected Q_SLOTS:
/**
* @internal
*/
void appletDestroyed(QObject*);
void dropEvent(QGraphicsSceneDragDropEvent* event);
private:
Q_DISABLE_COPY(Containment)
class Private;
Private* const d;
};
} // Plasma namespace
#endif // multiple inclusion guard