787 lines
28 KiB
C++
787 lines
28 KiB
C++
/*
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* Copyright 2006-2007 by Aaron Seigo <aseigo@kde.org>
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* Copyright 2007 by Riccardo Iaconelli <riccardo@kde.org>
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* Copyright 2008 by Ménard Alexis <darktears31@gmail.com>
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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 as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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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/QGraphicsItem>
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#include <QtGui/QWidget>
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#include <QtGui/QGraphicsWidget>
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#include <KDE/KConfigGroup>
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#include <KDE/KGenericFactory>
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#include <KDE/KPluginInfo>
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#include <KDE/KShortcut>
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#include <plasma/configxml.h>
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#include <plasma/packagestructure.h>
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#include <plasma/plasma.h>
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#include <plasma/animator.h>
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class KConfigDialog;
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class QGraphicsView;
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class KActionCollection;
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namespace Plasma
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{
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class Containment;
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class DataEngine;
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class Package;
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class AppletPrivate;
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/**
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* @short The base Applet class
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*
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* Applet provides several important roles for add-ons widgets in Plasma.
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*
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* First, it is the base class for the plugin system and therefore is the
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* interface to applets for host applications. It also handles the life time
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* management of data engines (e.g. all data engines accessed via
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* Applet::dataEngine(const QString&) are properly deref'd on Applet
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* destruction), background painting (allowing for consistent and complex
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* look and feel in just one line of code for applets), loading and starting
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* of scripting support for each applet, providing access to the associated
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* plasmoid package (if any) and access to configuration data.
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*
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* See techbase.kde.org for tutorial on writing Applets using this class.
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*/
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class PLASMA_EXPORT Applet : public QGraphicsWidget
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{
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Q_OBJECT
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Q_PROPERTY(bool hasConfigurationInterface READ hasConfigurationInterface)
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Q_PROPERTY(QString name READ name)
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Q_PROPERTY(QString category READ category)
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Q_PROPERTY(ImmutabilityType immutability READ immutability WRITE setImmutability)
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Q_PROPERTY(bool hasFailedToLaunch READ hasFailedToLaunch WRITE setFailedToLaunch)
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Q_PROPERTY(bool configurationRequired READ configurationRequired WRITE setConfigurationRequired)
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Q_PROPERTY(QRectF geometry READ geometry WRITE setGeometry)
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Q_PROPERTY(bool shouldConserveResources READ shouldConserveResources)
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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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* Description on how draw a background for the applet
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*/
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enum BackgroundHint { NoBackground = 0 /** Not drawing a background under the applet, the applet has its own implementation */,
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StandardBackground = 1 /** The standard background from the theme is drawn */,
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TranslucentBackground = 2 /** An alternate version of the background is drawn, usually more translucent */,
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ShadowedBackground = 4 /** The applet has a drop shadow */,
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DefaultBackground = StandardBackground | ShadowedBackground /** Default settings: both standard background and shadow */
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};
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Q_DECLARE_FLAGS(BackgroundHints, BackgroundHint)
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~Applet();
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/**
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* @return a package structure representing a Theme
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*/
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static PackageStructure::Ptr packageStructure();
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/**
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* @return the id of this applet
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*/
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uint id() const;
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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 config() const;
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/**
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* Returns a config group with the name provided. This ensures
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* that the group name is properly namespaced to avoid collision
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* with other applets that may be sharing this config file
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*
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* @param group the name of the group to access
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**/
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KConfigGroup config(const QString &group) const;
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/**
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* Saves state information about this applet that will
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* be accessed when next instantiated in the restore(KConfigGroup&) method.
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*
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* This method does not need to be reimplmented by Applet
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* subclasses, but can be useful for Applet specializations
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* (such as Containment) to do so.
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*
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* Applet subclasses may instead want to reimplement saveState().
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**/
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virtual void save(KConfigGroup &group) const;
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/**
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* Restores state information about this applet saved previously
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* in save(KConfigGroup&).
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*
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* This method does not need to be reimplmented by Applet
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* subclasses, but can be useful for Applet specializations
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* (such as Containment) to do so.
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**/
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virtual void restore(KConfigGroup &group);
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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 globalConfig() const;
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/**
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* Returns the config skeleton object from this applet's package,
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* if any.
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*
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* @return config skeleton object, or 0 if none
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**/
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ConfigXml* configScheme() const;
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/**
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* Loads the given DataEngine
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*
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* Tries to load the data engine given by @p name. Each engine is
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* only loaded once, and that instance is re-used on all subsequent
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* requests.
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*
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* If the data engine was not found, an invalid data engine is returned
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* (see DataEngine::isValid()).
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*
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* Note that you should <em>not</em> delete the returned engine.
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*
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* @param name Name of the data engine to load
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* @return pointer to the data engine if it was loaded,
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* or an invalid data engine if the requested engine
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* could not be loaded
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*/
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Q_INVOKABLE DataEngine* dataEngine(const QString& name) const;
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/**
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* Accessor for the associated Package object if any.
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* Generally, only Plasmoids come in a Package.
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*
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* @return the Package object, or 0 if none
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**/
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const Package* package() const;
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/**
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* Returns the view this widget is visible on
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*/
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QGraphicsView *view() const;
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/**
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* Maps a QRect from a view's coordinates to local coordinates.
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* @param view the view from which rect should be mapped
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* @param rect the rect to be mapped
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*/
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QRectF mapFromView(const QGraphicsView *view, const QRect &rect) const;
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/**
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* Maps a QRectF from local coordinates to a view's coordinates.
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* @param view the view to which rect should be mapped
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* @param rect the rect to be mapped
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*/
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QRect mapToView(const QGraphicsView *view, const QRectF &rect) const;
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/**
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* Reccomended position for a popup window like a menu or a tooltip
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* given its size
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* @param s size of the popup
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* @returns reccomended position
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*/
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QPoint popupPosition(const QSize &s) const;
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/**
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* Called when any of the geometry constraints have been updated.
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* This method calls constraintsEvent, which may be reimplemented,
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* once the Applet has been prepared for updating the constraints.
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*
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* @param constraints the type of constraints that were updated
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*/
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void updateConstraints(Plasma::Constraints constraints = Plasma::AllConstraints);
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/**
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* Returns the current form factor the applet is being displayed in.
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*
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* @see Plasma::FormFactor
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*/
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virtual 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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*
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* @see Plasma::Location
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*/
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virtual Location location() const;
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/**
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* @return the preferred aspect ratio mode for placement and resizing
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*/
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Plasma::AspectRatioMode aspectRatioMode() const;
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/**
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* Sets the preferred aspect ratio mode for placement and resizing
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*/
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void setAspectRatioMode(Plasma::AspectRatioMode);
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/**
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* Returns a list of all known applets.
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*
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* @param category Only applets matchin this category will be returned.
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* Useful in conjunction with knownCategories.
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* If "Misc" is passed in, then applets without a
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* Categories= entry are also returned.
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* If an empty string is passed in, all applets are
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* returned.
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* @param parentApp the application to filter applets on. Uses the
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* X-KDE-ParentApp entry (if any) in the plugin info.
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* The default value of QString() will result in a
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* list containing only applets not specifically
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* registered to an application.
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* @return list of applets
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**/
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static KPluginInfo::List listAppletInfo(const QString &category = QString(),
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const QString &parentApp = QString());
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/**
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* Returns a list of all known applets associated with a certain mimetype.
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*
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* @return list of applets
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**/
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static KPluginInfo::List listAppletInfoForMimetype(const QString &mimetype);
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/**
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* Returns a list of all the categories used by
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* installed applets.
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*
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* @param parentApp the application to filter applets on. Uses the
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* X-KDE-ParentApp entry (if any) in the plugin info.
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* The default value of QString() will result in a
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* list containing only applets not specifically
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* registered to an application.
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* @return list of categories
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* @param visibleOnly true if it should only return applets that are marked as visible
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*/
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static QStringList listCategories(const QString &parentApp = QString(), bool visibleOnly = true);
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/**
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* Attempts to load an applet
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*
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* Returns a pointer to the applet if successful.
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* 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 appletId unique ID to assign the applet, or zero to have one
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* assigned automatically.
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* @param args to send the applet extra arguments
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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* load(const QString &name, uint appletId = 0,
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const QVariantList& args = QVariantList());
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/**
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* Attempts to load an applet
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*
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* Returns a pointer to the applet if successful.
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* 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 appletId unique ID to assign the applet, or zero to have one
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* assigned automatically.
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* @param args to send the applet extra arguments
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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* load(const KPluginInfo& info, uint appletId = 0,
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const QVariantList& args = QVariantList());
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/**
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* Get the category of the given applet
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*
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* @param applet a KPluginInfo object for the applet
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*/
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static QString category(const KPluginInfo& applet);
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/**
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* Get the category of the given applet
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*
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* @param appletName the name of the applet
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*/
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static QString category(const QString& appletName);
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/**
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* This method is called when the interface should be painted.
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*
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* @param painter the QPainter to use to do the paintiner
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* @param option the style options object
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* @param contentsRect the rect to paint within; automatically adjusted for
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* the background, if any
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**/
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virtual void paintInterface(QPainter *painter,
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const QStyleOptionGraphicsItem *option,
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const QRect& contentsRect);
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/**
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* Returns the user-visible name for the applet, as specified in the
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* .desktop file.
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*
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* @return the user-visible name for the applet.
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**/
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QString name() const;
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/**
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* @return the font currently set for this widget
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**/
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QFont font() const;
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/**
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* Returns the plugin name for the applet
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*/
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QString pluginName() const;
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/**
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* Whether the applet should conserve resources. If true, try to avoid doing stuff which
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* is computationally heavy. Try to conserve power and resources.
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*
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* @return true if it should conserve resources, false if it does not.
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*/
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bool shouldConserveResources() const;
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/**
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* Returns the icon related to this applet
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**/
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QString icon() const;
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/**
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* Returns the category the applet is in, as specified in the
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* .desktop file.
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*/
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QString category() const;
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/**
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* @return The type of immutability of this applet
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*/
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ImmutabilityType immutability() const;
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void paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
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/**
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* If for some reason, the applet fails to get up on its feet (the
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* library couldn't be loaded, necessary hardware support wasn't found,
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* etc..) this method returns true
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**/
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bool hasFailedToLaunch() const;
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/**
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* @return true if the applet currently needs to be configured,
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* otherwise, false
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*/
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bool configurationRequired() const;
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/**
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* @return true if this plasmoid provides a GUI configuration
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**/
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bool hasConfigurationInterface() const;
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/**
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* Returns a list of context-related QAction instances.
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*
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* This is used e.g. within the \a DesktopView to display a
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* contextmenu.
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*
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* @return A list of actions. The default implementation returns an
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* empty list.
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**/
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virtual QList<QAction*> contextualActions();
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/**
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* Returns the QAction with the given name from our collection
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*/
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QAction* action(QString name) const;
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/**
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* Adds the action to our collection under the given name
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*/
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void addAction(QString name, QAction *action);
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/**
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* Sets the BackgroundHints for this applet @see BackgroundHint
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*
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* @param hints the BackgroundHint combination for this applet
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*/
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void setBackgroundHints(const BackgroundHints hints);
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/**
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* @return BackgroundHints flags combination telling if the standard background is shown
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* and if it has a drop shadow
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*/
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BackgroundHints backgroundHints() const;
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/**
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* @return true if this Applet is currently being used as a Containment, false otherwise
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*/
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bool isContainment() const;
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/**
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* @return a rect of the applet in screen coordinates.
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*/
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QRect screenRect() const;
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/**
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* Reimplemented from QGraphicsItem
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**/
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int type() const;
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enum { Type = Plasma::AppletType };
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/**
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* @return the Containment, if any, this applet belongs to
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**/
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Containment* containment() const;
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/**
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* Sets the global shorcut to associate with this widget.
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*/
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void setGlobalShortcut(const KShortcut &shortcut);
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/**
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* @return the global shortcut associated with this wiget, or
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* an empty shortcut if no global shortcut is associated.
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*/
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KShortcut globalShortcut() const;
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/**
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* associate actions with this widget, including ones added after this call.
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* needed to make keyboard shortcuts work.
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*/
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virtual void addAssociatedWidget(QWidget *widget);
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/**
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* un-associate actions from this widget, including ones added after this call.
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* needed to make keyboard shortcuts work.
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*/
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virtual void removeAssociatedWidget(QWidget *widget);
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/**
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* @param parent the QGraphicsItem this applet is parented to
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* @param serviceId the name of the .desktop file containing the
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* information about the widget
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* @param 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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explicit Applet(QGraphicsItem* parent = 0,
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const QString& serviceId = QString(),
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uint appletId = 0);
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Q_SIGNALS:
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/**
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* This signal indicates that an application launch, window
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* creation or window focus event was triggered. This is used, for instance,
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* to ensure that the Dashboard view in Plasma hides when such an event is
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* triggered by an item it is displaying.
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*/
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void releaseVisualFocus();
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/**
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* Emitted whenever the applet makes a geometry change, so that views
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* can coordinate themselves with these changes if they desire.
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*/
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void geometryChanged();
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/**
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* Emitted when an applet has changed values in its configuration
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* and wishes for them to be saved at the next save point. As this implies
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* disk activity, this signal should be used with care.
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*
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* @note This does not need to be emitted from saveState by individual
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* applets.
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*/
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void configNeedsSaving();
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/**
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* Emitted when activation is requested due to, for example, a global
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* keyboard shortcut. By default the wiget is given focus.
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*/
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void activate();
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public Q_SLOTS:
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/**
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* Sets the immutability type for this applet (not immutable, user immutable or system immutable)
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* @arg immutable the new immutability type of this applet
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*/
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void setImmutability(const ImmutabilityType immutable);
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/**
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* Destroys the applet; it will be removed nicely and deleted.
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* Its configuration will also be deleted.
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*/
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virtual void destroy();
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/**
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* Lets the user interact with the plasmoid options.
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* Called when the user selects the configure entry
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* from the context menu.
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*
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* Unless there is good reason for overriding this method,
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* Applet subclasses should actually override createConfigurationInterface
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* instead. A good example of when this isn't plausible is
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* when using a dialog prepared by another library, such
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* as KPropertiesDialog from libkfile.
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*/
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virtual void showConfigurationInterface();
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/**
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* Causes this applet to raise above all other applets.
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*/
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void raise();
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/**
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* Causes this applet to lower below all the other applets.
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*/
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void lower();
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/**
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* Sends all pending contraints updates to the applet. Will usually
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* be called automatically, but can also be called manually if needed.
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*/
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void flushPendingConstraintsEvents();
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/**
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* This method is called once the applet is loaded and added to a Corona.
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* If the applet requires a QGraphicsScene or has an particularly intensive
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* set of initialization routines to go through, consider implementing it
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* in this method instead of the constructor.
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**/
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virtual void init();
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protected:
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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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* @param parent a QObject parent; you probably want to pass in 0
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* @param 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 QVariantList& args);
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/**
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* Call this method when the applet fails to launch properly. An
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* optional reason can be provided.
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*
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* Not that all children items will be deleted when this method is
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* called. If you have pointers to these items, you will need to
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* reset them after calling this method.
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*
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* @param failed true when the applet failed, false when it succeeded
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* @param reason an optional reason to show the user why the applet
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* failed to launch
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**/
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void setFailedToLaunch(bool failed, const QString& reason = QString());
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|
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/**
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* When called, the Applet should write any information needed as part
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* of the Applet's running state to the configuration object in config()
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* and/or globalConfig().
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*
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* Applets that always sync their settings/state with the config
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* objects when these settings/states change do not need to reimplement
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* this method.
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**/
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virtual void saveState(KConfigGroup &config) const;
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|
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/**
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* Sets whether or not this applet provides a user interface for
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* configuring the applet.
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*
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* It defaults to false, and if true is passed in you should
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* also reimplement createConfigurationInterface()
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*
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* @param hasInterface whether or not there is a user interface available
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**/
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void setHasConfigurationInterface(bool hasInterface);
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/**
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* When the applet needs to be configured before being usable, this
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* method can be called to show a standard interface prompting the user
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* to configure the applet
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|
*
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|
* Not that all children items will be deleted when this method is
|
|
* called. If you have pointers to these items, you will need to
|
|
* reset them after calling this method.
|
|
*
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* @param needsConfiguring true if the applet needs to be configured,
|
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* or false if it doesn't
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*/
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void setConfigurationRequired(bool needsConfiguring, const QString& reason = QString());
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/**
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* Reimplement this method so provide a configuration interface,
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* parented to the supplied widget. Ownership of the widgets is passed
|
|
* to the parent widget.
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*
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* @param parent the dialog which is the parent of the configuration
|
|
* widgets
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|
*/
|
|
virtual void createConfigurationInterface(KConfigDialog *parent);
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|
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/**
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* Sets whether or not this Applet is acting as a Containment
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|
*/
|
|
void setIsContainment(bool isContainment);
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|
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/**
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* Called when any of the geometry constraints have been updated.
|
|
*
|
|
* This is always called prior to painting and should be used as an
|
|
* opportunity to layout the widget, calculate sizings, etc.
|
|
*
|
|
* Do not call update() from this method; an update() will be triggered
|
|
* at the appropriate time for the applet.
|
|
*
|
|
* @param constraints the type of constraints that were updated
|
|
* @property constraint
|
|
*/
|
|
virtual void constraintsEvent(Plasma::Constraints constraints);
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|
|
/**
|
|
* Register the widgets that manage mouse clicks but you still want
|
|
* to be able to drag the applet around when holding the mouse pointer
|
|
* on that widget.
|
|
*
|
|
* Calling this results in an eventFilter being places on the widget.
|
|
*
|
|
* @param item the item to watch for mouse move
|
|
*/
|
|
void registerAsDragHandle(QGraphicsItem *item);
|
|
|
|
/**
|
|
* Unregister a widget registered with registerAsDragHandle.
|
|
*
|
|
* @param item the item to unregister
|
|
*/
|
|
void unregisterAsDragHandle(QGraphicsItem *item);
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|
|
/**
|
|
* @param item the item to look for if it is registered or not
|
|
* @return true if it is registered, false otherwise
|
|
*/
|
|
bool isRegisteredAsDragHandle(QGraphicsItem *item);
|
|
|
|
/**
|
|
* @internal event filter; used for focus watching
|
|
**/
|
|
bool eventFilter( QObject *o, QEvent *e );
|
|
|
|
/**
|
|
* @internal scene event filter; used to manage applet dragging
|
|
*/
|
|
bool sceneEventFilter ( QGraphicsItem * watched, QEvent * event );
|
|
|
|
/**
|
|
* @internal manage the mouse movement to drag the applet around
|
|
*/
|
|
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
|
|
|
|
/**
|
|
* @internal manage the mouse movement to drag the applet around
|
|
*/
|
|
void mousePressEvent(QGraphicsSceneMouseEvent *event);
|
|
|
|
/**
|
|
* Reimplemented from QGraphicsItem
|
|
*/
|
|
void focusInEvent(QFocusEvent *event);
|
|
|
|
/**
|
|
* Reimplemented from QGraphicsItem
|
|
*/
|
|
void resizeEvent(QGraphicsSceneResizeEvent *event);
|
|
|
|
/**
|
|
* Reimplemented from QGraphicsItem
|
|
*/
|
|
QVariant itemChange(GraphicsItemChange change, const QVariant &value);
|
|
|
|
/**
|
|
* Reimplemented from QGraphicsItem
|
|
*/
|
|
bool sceneEvent(QEvent *event);
|
|
|
|
/**
|
|
* Reimplemented from QGraphicsItem
|
|
*/
|
|
QPainterPath shape() const;
|
|
|
|
/**
|
|
* Reimplemented from QGraphicsLayoutItem
|
|
*/
|
|
QSizeF sizeHint(Qt::SizeHint which, const QSizeF & constraint = QSizeF()) const;
|
|
|
|
/**
|
|
* Reimplemented from QObject
|
|
*/
|
|
void timerEvent (QTimerEvent *event);
|
|
|
|
private:
|
|
Q_PRIVATE_SLOT(d, void setFocus())
|
|
Q_PRIVATE_SLOT(d, void checkImmutability())
|
|
Q_PRIVATE_SLOT(d, void themeChanged())
|
|
Q_PRIVATE_SLOT(d, void appletAnimationComplete(QGraphicsItem *item, Plasma::Animator::Animation anim))
|
|
Q_PRIVATE_SLOT(d, void selectItemToDestroy())
|
|
|
|
/**
|
|
* Reimplemented from QGraphicsItem
|
|
**/
|
|
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
|
|
|
|
AppletPrivate* const d;
|
|
|
|
//Corona needs to access setFailedToLaunch and init
|
|
friend class Corona;
|
|
friend class CoronaPrivate;
|
|
friend class Containment;
|
|
friend class ContainmentPrivate;
|
|
friend class AppletScript;
|
|
friend class AppletHandle;
|
|
friend class AppletPrivate;
|
|
};
|
|
|
|
} // Plasma namespace
|
|
|
|
Q_DECLARE_OPERATORS_FOR_FLAGS(Plasma::Applet::BackgroundHints)
|
|
|
|
/**
|
|
* Register an applet when it is contained in a loadable module
|
|
*/
|
|
#define K_EXPORT_PLASMA_APPLET(libname, classname) \
|
|
K_PLUGIN_FACTORY(factory, registerPlugin<classname>();) \
|
|
K_EXPORT_PLUGIN(factory("plasma_applet_" #libname))
|
|
|
|
#endif // multiple inclusion guard
|