468 lines
17 KiB
C++
468 lines
17 KiB
C++
/*
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* Copyright 2008 by Aaron Seigo <aseigo@kde.org>
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* Copyright 2008 by Petri Damsten <damu@iki.fi>
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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_WALLPAPER_H
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#define PLASMA_WALLPAPER_H
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#include <kplugininfo.h>
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#include <plasma/plasma.h>
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#include <plasma/packagestructure.h>
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#include <plasma/version.h>
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namespace Plasma
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{
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class DataEngine;
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class WallpaperPrivate;
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/**
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* @class Wallpaper plasma/wallpaper.h <Plasma/Wallpaper>
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*
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* @short The base Wallpaper class
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*
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* "Wallpapers" are components that paint the background for Containments that
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* do not provide their own background rendering.
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*
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* Wallpaper plugins are registered using .desktop files. These files should be
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* named using the following naming scheme:
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*
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* plasma-wallpaper-\<pluginname\>.desktop
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*
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* If a wallpaper plugin provides more than on mode (e.g. Single Image, Wallpaper)
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* it should include a Actions= entry in the .desktop file, listing the possible
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* actions. An actions group should be included to provide for translatable names.
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*/
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class PLASMA_EXPORT Wallpaper : public QObject
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{
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Q_OBJECT
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Q_PROPERTY(QRectF boundingRect READ boundingRect WRITE setBoundingRect)
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Q_PROPERTY(QString name READ name)
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Q_PROPERTY(QString pluginName READ pluginName)
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Q_PROPERTY(QString icon READ icon)
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Q_PROPERTY(KServiceAction renderingMode READ renderingMode)
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Q_PROPERTY(QList<KServiceAction> listRenderingModes READ listRenderingModes)
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Q_PROPERTY(bool usingRenderingCache READ isUsingRenderingCache WRITE setUsingRenderingCache)
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public:
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/**
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* Various resize modes supported by the built in image renderer
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*/
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enum ResizeMethod {
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ScaledResize /**< Scales the image to fit the full area*/,
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CenteredResize /**< Centers the image within the area */,
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ScaledAndCroppedResize /**< Scales and crops the image, preserving the aspect ratio */,
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TiledResize /**< Tiles the image to fill the area */,
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CenterTiledResize /**< Tiles the image to fill the area, starting with a centered tile */,
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MaxpectResize /**< Best fit resize */
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};
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Q_ENUMS(ResizeMethod)
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/**
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* Default constructor for an empty or null wallpaper
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*/
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explicit Wallpaper(QObject * parent = 0);
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~Wallpaper();
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/**
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* Returns a list of all known wallpapers.
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*
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* @arg formFactor the format of the wallpaper being search for (e.g. desktop)
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* @return list of wallpapers
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**/
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static KPluginInfo::List listWallpaperInfo(const QString &formFactor = QString());
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/**
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* Returns a list of all known wallapers that can accept the given mimetype
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* @arg mimetype the mimetype to search for
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* @arg formFactor the format of the wallpaper being search for (e.g. desktop)
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* @return list of wallpapers
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*/
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static KPluginInfo::List listWallpaperInfoForMimetype(const QString &mimetype,
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const QString &formFactor = QString());
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/**
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* Attempts to load a wallpaper
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*
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* Returns a pointer to the wallpaper if successful.
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* The caller takes responsibility for the wallpaper, 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 args to send the wallpaper extra arguments
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* @return a pointer to the loaded wallpaper, or 0 on load failure
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**/
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static Wallpaper *load(const QString &name, const QVariantList &args = QVariantList());
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/**
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* Attempts to load a wallpaper
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*
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* Returns a pointer to the wallpaper if successful.
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* The caller takes responsibility for the wallpaper, 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 wallpaper
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* @param args to send the wallpaper extra arguments
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* @return a pointer to the loaded wallpaper, or 0 on load failure
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**/
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static Wallpaper *load(const KPluginInfo &info, const QVariantList &args = QVariantList());
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/**
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* Returns the Package specialization for wallpapers. May be queried for 'preferred'
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* which will return the preferred wallpaper image path given the associated Wallpaper
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* object, if any.
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*
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* @param paper the Wallpaper object to associated the PackageStructure with,
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* which will then use the Wallpaper object to define things such as
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* default size and resize methods.
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*/
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static PackageStructure::Ptr packageStructure(Wallpaper *paper = 0);
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/**
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* Returns the user-visible name for the wallpaper, 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 wallpaper.
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**/
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QString name() const;
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/**
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* Returns the plugin name for the wallpaper
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*/
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QString pluginName() const;
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/**
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* Returns the icon related to this wallpaper
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**/
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QString icon() const;
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/**
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* @return the currently active rendering mode
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*/
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KServiceAction renderingMode() const;
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/**
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* Sets the rendering mode for this wallpaper.
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* @param mode One of the modes supported by the plugin,
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* or an empty string for the default mode.
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*/
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void setRenderingMode(const QString &mode);
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/**
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* Returns modes the wallpaper has, as specified in the
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* .desktop file.
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*/
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QList<KServiceAction> listRenderingModes() const;
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/**
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* @return true if initialized (usually by calling restore), false otherwise
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*/
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bool isInitialized() const;
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/**
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* Returns bounding rectangle
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*/
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QRectF boundingRect() const;
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/**
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* Sets bounding rectangle
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*/
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void setBoundingRect(const QRectF &boundingRect);
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/**
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* This method is called when the wallpaper should be painted.
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*
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* @param painter the QPainter to use to do the painting
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* @param exposedRect the rect to paint within
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**/
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virtual void paint(QPainter *painter, const QRectF &exposedRect) = 0;
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/**
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* This method should be called once the wallpaper is loaded or mode is changed.
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* @param config Config group to load settings
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* @see init
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**/
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void restore(const KConfigGroup &config);
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/**
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* This method is called when settings need to be saved.
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* @param config Config group to save settings
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**/
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virtual void save(KConfigGroup &config);
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/**
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* Returns a widget that can be used to configure the options (if any)
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* associated with this wallpaper. It will be deleted by the caller
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* when it complete. The default implementation returns a null pointer.
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*
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* To signal that settings have changed connect to
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* settingsChanged(bool modified) in @p parent.
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*
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* @code connect(this, SIGNAL(settingsChanged(bool), parent, SLOT(settingsChanged(bool)))
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* @endcode
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*
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* Emit settingsChanged(true) when the settings are changed and false when the original state is restored.
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*
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* Implementation detail note: for best visual results, use a QGridLayout with two columns,
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* with the option labels in column 0
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*/
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virtual QWidget *createConfigurationInterface(QWidget *parent);
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/**
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* Mouse move event. To prevent further propagation of the event,
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* the event must be accepted.
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*
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* @param event the mouse event object
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*/
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virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
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/**
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* Mouse press event. To prevent further propagation of the even,
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* and to receive mouseMoveEvents, the event must be accepted.
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*
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* @param event the mouse event object
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*/
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virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
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/**
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* Mouse release event. To prevent further propagation of the event,
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* the event must be accepted.
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*
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* @param event the mouse event object
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*/
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virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
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/**
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* Mouse wheel event. To prevent further propagation of the event,
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* the event must be accepted.
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*
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* @param event the wheel event object
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*/
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virtual void wheelEvent(QGraphicsSceneWheelEvent *event);
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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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* @since 4.3
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*/
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Q_INVOKABLE DataEngine *dataEngine(const QString &name) const;
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/**
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* @return true if the wallpaper currently needs to be configured,
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* otherwise, false
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* @since 4.3
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*/
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bool configurationRequired() const;
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/**
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* @return true if disk caching is turned on.
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* @since 4.3
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*/
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bool isUsingRenderingCache() const;
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/**
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* Allows one to set rendering hints that may differ from the actualities of the
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* Wallpaper's current state, allowing for better selection of papers from packages,
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* for instance.
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*
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* @arg resizeMethod The resize method to assume will be used for future wallpaper
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* scaling; may later be changed by calls to render()
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*
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* @since 4.3
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*/
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void setResizeMethodHint(Wallpaper::ResizeMethod resizeMethod);
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/*
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* Allows one to set rendering hints that may differ from the actualities of the
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* Wallpaper's current state, allowing for better selection of papers from packages,
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* for instance.
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*
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* @arg targetSize The size to assume will be used for future wallpaper scaling
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*
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* @since 4.3
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*/
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void setTargetSizeHint(const QSizeF &targetSize);
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Q_SIGNALS:
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/**
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* This signal indicates that wallpaper needs to be repainted.
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*/
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void update(const QRectF &exposedArea);
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/**
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* Emitted when the user wants to configure/change the wallpaper.
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* @since 4.3
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*/
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void configureRequested();
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/**
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* Emitted when the state of the wallpaper requiring configuration
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* changes.
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* @since 4.3
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*/
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void configurationRequired(bool needsConfig);
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/**
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* Emitted when the configuration of the wallpaper needs to be saved
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* to disk.
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* @since 4.3
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*/
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void configNeedsSaving();
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/**
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* Emitted when a wallpaper image render is completed.
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* @since 4.3
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*/
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void renderCompleted(const QImage &image);
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/**
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* @internal
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*/
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void renderHintsChanged();
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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 one element: the KService service ID for the desktop entry.
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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 one entry: the service id
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*/
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Wallpaper(QObject *parent, const QVariantList &args);
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/**
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* This method is called once the wallpaper is loaded or mode is changed.
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*
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* The mode can be retrieved using the renderingMode() method.
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*
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* @param config Config group to load settings
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**/
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virtual void init(const KConfigGroup &config);
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/**
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* When the wallpaper needs to be configured before being usable, this
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* method can be called to denote that action is required
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*
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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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* @param reason a translated message for the user explaining that the
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* applet needs configuring; this should note what needs
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* to be configured
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* @since 4.3
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*/
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void setConfigurationRequired(bool needsConfiguring, const QString &reason = QString());
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/**
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* Renders the wallpaper asyncronously with the given parameters. When the rendering is
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* complete, the renderCompleted signal is emitted.
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*
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* @param sourceImagePath the path to the image file on disk. Common image formats such as
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* PNG, JPEG and SVG are supported
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* @param size the size to render the image as
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* @param resizeMethod the method to use when resizing the image to fit size, @see
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* ResizeMethod
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* @param color the color to use to pad the rendered image if it doesn't take up the
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* entire size with the given ResizeMethod
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* @since 4.3
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*/
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void render(const QString &sourceImagePath, const QSize &size,
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Wallpaper::ResizeMethod resizeMethod = ScaledResize,
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const QColor &color = QColor(0, 0, 0));
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/**
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* Sets whether or not to cache on disk the results of calls to render. If the wallpaper
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* changes often or is innexpensive to render, then it's probably best not to cache them.
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*
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* The default is not to cache.
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*
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* @see render
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* @param useCache true to cache rendered papers on disk, false not to cache
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* @since 4.3
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*/
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void setUsingRenderingCache(bool useCache);
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/**
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* Tries to load pixmap with the specified key from cache.
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*
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* @param key the name to use in the cache for this image
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* @param image the image object to populate with the resulting data if found
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* @param lastModified if non-zero, the time stamp is also checked on the file,
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* and must be newer than the timestamp to be loaded
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*
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* @return true when pixmap was found and loaded from cache, false otherwise
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* @since 4.3
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**/
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bool findInCache(const QString &key, QImage &image, unsigned int lastModified = 0);
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/**
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* Insert specified pixmap into the cache if usingRenderingCache.
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* If the cache already contains pixmap with the specified key then it is
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* overwritten.
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*
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* @param key the name use in the cache for this image; if the image is specific
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* to this wallpaper plugin, consider including the name() as part of
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* the cache key to avoid collisions with other plugins.
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* @param image the image to store in the cache; passing in a null image will cause
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* the cached image to be removed from the cache
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*
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* @since 4.3
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**/
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void insertIntoCache(const QString& key, const QImage &image);
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private:
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Q_PRIVATE_SLOT(d, void renderCompleted(int token, const QImage &image,
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const QString &sourceImagePath, const QSize &size,
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int resizeMethod, const QColor &color))
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friend class WallpaperPackage;
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friend class WallpaperPrivate;
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WallpaperPrivate *const d;
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};
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} // Plasma namespace
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/**
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* Register a wallpaper when it is contained in a loadable module
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*/
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#define K_EXPORT_PLASMA_WALLPAPER(libname, classname) \
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K_PLUGIN_FACTORY(factory, registerPlugin<classname>();) \
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K_EXPORT_PLUGIN(factory("plasma_wallpaper_" #libname)) \
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K_EXPORT_PLUGIN_VERSION(PLASMA_VERSION)
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#endif // multiple inclusion guard
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