plasma-framework/corona.h

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/*
* Copyright 2007 Aaron Seigo <aseigo@kde.org>
* Copyright 2007 Matt Broadstone <mbroadst@gmail.com>
*
* 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_CORONA_H
#define PLASMA_CORONA_H
#include <QtGui/QGraphicsScene>
#include <plasma/applet.h>
#include <plasma/plasma.h>
#include <plasma/plasma_export.h>
class QGraphicsGridLayout;
namespace Plasma
{
class Containment;
class CoronaPrivate;
/**
* @class Corona plasma/corona.h <Plasma/Corona>
*
* @short A QGraphicsScene for Plasma::Applets
*/
class PLASMA_EXPORT Corona : public QGraphicsScene
{
Q_OBJECT
//typedef QHash<QString, QList<Plasma::Applet*> > layouts;
public:
explicit Corona(QObject * parent = 0);
~Corona();
/**
* Sets the mimetype of Drag/Drop items. Default is
* text/x-plasmoidservicename
*/
void setAppletMimeType(const QString &mimetype);
/**
* The current mime type of Drag/Drop items.
*/
QString appletMimeType();
/**
* @return all containments on this Corona
*/
QList<Containment*> containments() const;
/**
* Clear the Corona from all applets.
*/
void clearContainments();
/**
* Returns the config file used to store the configuration for this Corona
*/
KSharedConfig::Ptr config() const;
/**
* Adds a Containment to the Corona
*
* @param name the plugin name for the containment, as given by
* KPluginInfo::pluginName(). If an empty string is passed in, the defalt
* containment plugin will be used (usually DesktopContainment). If the
* string literal "null" is passed in, then no plugin will be loaded and
* a simple Containment object will be created instead.
* @param args argument list to pass to the containment
*
* @return a pointer to the containment on success, or 0 on failure
*/
Containment *addContainment(const QString &name, const QVariantList &args = QVariantList());
/**
* Returns the Containment, if any, for a given physical screen
*
* @param screen number of the physical screen to locate
*/
Containment *containmentForScreen(int screen) const;
/**
* Adds a widget in the topleft quadrant in the scene. Widgets in the topleft quadrant are
* normally never shown unless you specifically aim a view at it, which makes it ideal for
* toplevel views etc.
* @param widget the widget to add.
*/
void addOffscreenWidget(QGraphicsWidget *widget);
/**
* Removes a widget from the topleft quadrant in the scene.
* @param widget the widget to remove.
*/
void removeOffscreenWidget(QGraphicsWidget *widget);
/**
* Returns the number of screens available to plasma.
* Subclasses should override this method as the default
* implementation returns a meaningless value.
*/
virtual int numScreens() const;
/**
* Returns the geometry of a given screen.
* Valid screen ids are 0 to numScreen()-1, or -1 for the full desktop geometry.
* Subclasses should override this method as the default
* implementation returns a meaningless value.
*/
virtual QRect screenGeometry(int id) const;
/**
* Returns the available region for a given screen.
* The available region excludes panels and similar windows.
* Valid screen ids are 0 to numScreens()-1.
* By default this method returns a rectangular region
* equal to screenGeometry(id); subclasses that need another
* behavior should override this method.
*/
virtual QRegion availableScreenRegion(int id) const;
/**
* Reccomended position for a popup window like a menu or a tooltip
* given its size
* @param s size of the popup
* @returns reccomended position
*/
QPoint popupPosition(const QGraphicsItem *item, const QSize &s);
public Q_SLOTS:
/**
* Initializes the layout from a config file. This will first clear any existing
* Containments, load a layout from the requested configuration file, request the
* default layout if needed and update immutability.
*
* @param config the name of the config file to load from,
* or the default config file if QString()
*/
void initializeLayout(const QString &config = QString());
/**
* Load applet layout from a config file. The results will be added to the
* current set of Containments.
*
* @param config the name of the config file to load from,
* or the default config file if QString()
*/
void loadLayout(const QString &config = QString());
/**
* Save applets layout to file
* @arg config the file to save to, or the default config file if QString()
*/
void saveLayout(const QString &config = QString()) const;
/**
* @return The type of immutability of this Corona
*/
ImmutabilityType immutability() const;
/**
* Sets the immutability type for this Corona (not immutable,
* user immutable or system immutable)
* @arg immutable the new immutability type of this applet
*/
void setImmutability(const ImmutabilityType immutable);
/**
* Schedules a flush-to-disk synchronization of the configuration state
* at the next convenient moment.
*/
void requestConfigSync();
Q_SIGNALS:
/**
* This signal indicates a new containment has been added to
* the Corona
*/
void containmentAdded(Plasma::Containment *containment);
/**
* This signal indicates that a containment has been newly
* associated (or dissociated) with a physical screen.
*
* @param wasScreen the screen it was associated with
* @param isScreen the screen it is now associated with
* @param containment the containment switching screens
*/
void screenOwnerChanged(int wasScreen, int isScreen, Plasma::Containment *containment);
/**
* This signal indicates that an application launch, window
* creation or window focus event was triggered. This is used, for instance,
* to ensure that the Dashboard view in Plasma hides when such an event is
* triggered by an item it is displaying.
*/
void releaseVisualFocus();
/**
* This signal indicates that the configuration file was flushed to disc.
*/
void configSynced();
/**
* This signal inicates that a change in available screen goemetry occured.
*/
void availableScreenRegionChanged();
protected:
/**
* Loads the default (system wide) layout for this user
**/
virtual void loadDefaultLayout();
/**
* Loads a containment with delayed initialization, primarily useful
* for implementations of loadDefaultLayout. The caller is responsible
* for all initializating, saving and notification of a new containment.
*
* @param name the plugin name for the containment, as given by
* KPluginInfo::pluginName(). If an empty string is passed in, the defalt
* containment plugin will be used (usually DesktopContainment). If the
* string literal "null" is passed in, then no plugin will be loaded and
* a simple Containment object will be created instead.
* @param args argument list to pass to the containment
*
* @return a pointer to the containment on success, or 0 on failure
**/
Containment *addContainmentDelayed(const QString &name,
const QVariantList &args = QVariantList());
//Reimplemented from QGraphicsScene
void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
private:
CoronaPrivate *const d;
Q_PRIVATE_SLOT(d, void containmentDestroyed(QObject*))
Q_PRIVATE_SLOT(d, void offscreenWidgetDestroyed(QObject *))
Q_PRIVATE_SLOT(d, void syncConfig())
friend class CoronaPrivate;
};
} // namespace Plasma
#endif