/* * Copyright 2006-2007 Aaron Seigo * * 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_THEME_H #define PLASMA_THEME_H #include #include #include #include #include #include namespace Plasma { class ThemePrivate; /** * @class Theme plasma/theme.h * * @short Interface to the Plasma theme * * Accessed via Plasma::Theme::defaultTheme() e.g: * \code * QString imagePath = Plasma::Theme::defaultTheme()->imagePath("widgets/clock") * \endcode * * Plasma::Theme provides access to a common and standardized set of graphic * elements stored in SVG format. This allows artists to create single packages * of SVGs that will affect the look and feel of all workspace components. * * Plasma::Svg uses Plasma::Theme internally to locate and load the appropriate * SVG data. Alternatively, Plasma::Theme can be used directly to retrieve * file system paths to SVGs by name. */ class PLASMA_EXPORT Theme : public QObject { Q_OBJECT Q_PROPERTY(QString themeName READ themeName) public: enum ColorRole { TextColor = 0, /**< the text color to be used by items resting on the background */ HighlightColor = 1, /**< the text higlight color to be used by items resting on the background */ BackgroundColor = 2, /**< the default background color */ ButtonTextColor = 4, /** text color for buttons */ ButtonBackgroundColor = 8, /** background color for buttons*/ LinkColor = 16, /** color for clickable links */ VisitedLinkColor = 32, /** color visited clickable links */ ButtonHoverColor = 64, /** color for hover effect on buttons */ ButtonFocusColor = 128, /** color for focus effect on buttons */ ViewTextColor = 256, /** text color for views */ ViewBackgroundColor = 512, /** background color for views */ ViewHoverColor = 1024, /** color for hover effect on view */ ViewFocusColor = 2048 /** color for focus effect on view */ }; enum FontRole { DefaultFont = 0, /**< The standard text font */ DesktopFont, /**< The standard text font */ SmallestFont /**< The smallest readable font */ }; /** * Singleton pattern accessor **/ static Theme *defaultTheme(); /** * Default constructor. Usually you want to use the singleton instead. * @see defaultTheme * @param parent the parent object */ explicit Theme(QObject *parent = 0); /** * Construct a theme. Usually you want to use the singleton instead. * @see defaultTheme * @param themeName the name of the theme to create * @param parent the parent object * @since 4.3 */ explicit Theme(const QString &themeName, QObject *parent = 0); ~Theme(); /** * @return a list of all known themes * @since 4.3 */ static KPluginInfo::List listThemeInfo(); /** * Sets the current theme being used. */ void setThemeName(const QString &themeName); /** * @return the name of the theme. */ QString themeName() const; /** * Retrieve the path for an SVG image in the current theme. * * @param name the name of the file in the theme directory (without the * ".svg" part or a leading slash) * @return the full path to the requested file for the current theme */ Q_INVOKABLE QString imagePath(const QString &name) const; /** * Retrieves the path for the script file that contains a given * Javascript animation. * @param the name of the animation * @return the full path to the script file, or an emptry string on failure * @since 4.5 */ Q_INVOKABLE QString animationPath(const QString &name) const; /** * Retrieves the default wallpaper associated with this theme. * * @param size the target height and width of the wallpaper; if an invalid size * is passed in, then a default size will be provided instead. * @return the full path to the wallpaper image */ Q_INVOKABLE QString wallpaperPath(const QSize &size = QSize()) const; /** * Checks if this theme has an image named in a certain way * * @param name the name of the file in the theme directory (without the * ".svg" part or a leading slash) * @return true if the image exists for this theme */ Q_INVOKABLE bool currentThemeHasImage(const QString &name) const; /** * Returns the color scheme configurationthat goes along this theme. * This can be used with KStatefulBrush and KColorScheme to determine * the proper colours to use along with the visual elements in this theme. */ Q_INVOKABLE KSharedConfigPtr colorScheme() const; /** * Returns the text color to be used by items resting on the background * * @param role which role (usage pattern) to get the color for */ Q_INVOKABLE QColor color(ColorRole role) const; /** * Sets the default font to be used with themed items. Defaults to * the application wide default font. * * @param font the new font * @param role which role (usage pattern) to set the font for */ Q_INVOKABLE void setFont(const QFont &font, FontRole role = DefaultFont); /** * Returns the font to be used by themed items * * @param role which role (usage pattern) to get the font for */ Q_INVOKABLE QFont font(FontRole role) const; /** * Returns the font metrics for the font to be used by themed items */ Q_INVOKABLE QFontMetrics fontMetrics() const; /** * Returns if the window manager effects (e.g. translucency, compositing) is active or not */ Q_INVOKABLE bool windowTranslucencyEnabled() const; /** * Tells the theme whether to follow the global settings or use application * specific settings * * @param useGlobal pass in true to follow the global settings */ void setUseGlobalSettings(bool useGlobal); /** * @return true if the global settings are followed, false if application * specific settings are used. */ bool useGlobalSettings() const; /** * @return true if the native widget styles should be used instead of themed * widgets. Defaults is false. */ bool useNativeWidgetStyle() const; /** * Provides a Plasma::Theme-themed stylesheet for hybrid (web / native Plasma) widgets. * * You can use this method to retrieve a basic default stylesheet, or to theme your * custom stylesheet you use for example in Plasma::WebView. The QString you can pass * into this method does not have to be a valid stylesheet, in fact you can use this * method to replace color placeholders with the theme's color in any QString. * * In order to use this method with a custom stylesheet, just put for example %textcolor * in your QString and it will be replaced with the theme's text (or foreground) color. * * Just like in many other methods for retrieving theme information, do not forget to * update your stylesheet upon the themeChanged() signal. * * The following tags will be replaced by corresponding colors from Plasma::Theme: * * %textcolor * %backgroundcolor * %buttonbackgroundcolor * * %link * %activatedlink * %hoveredlink * %visitedlink * * %fontfamily * %fontsize * %smallfontsize * * @param css a stylesheet to theme, leave empty for a default stylesheet containing * theming for some commonly used elements, body text and links, for example. * * @return a piece of CSS that sets the most commonly used style elements to a theme * matching Plasma::Theme. * * @since 4.5 */ Q_INVOKABLE QString styleSheet(const QString &css = QString()) const; /** * This is an overloaded member provided to check with file timestamp * where cache is still valid. * * @param key the name to use in the cache for this image * @param pix the pixmap object to populate with the resulting data if found * @param lastModified if non-zero, the time stamp is also checked on the file, * and must be newer than the timestamp to be loaded * * @return true when pixmap was found and loaded from cache, false otherwise * @since 4.3 **/ bool findInCache(const QString &key, QPixmap &pix, unsigned int lastModified = 0); /** * Insert specified pixmap into the cache. * If the cache already contains pixmap with the specified key then it is * overwritten. * * @param key the name to use in the cache for this pixmap * @param pix the pixmap data to store in the cache **/ void insertIntoCache(const QString& key, const QPixmap& pix); /** * Insert specified pixmap into the cache. * If the cache already contains pixmap with the specified key then it is * overwritten. * The actual insert is delayed for optimization reasons and the id * parameter is used to discard repeated inserts in the delay time, useful * when for instance the graphics to inser comes from a quickly resizing * object: the frames between the start and destination sizes aren't * useful in the cache and just cause overhead. * * @param key the name to use in the cache for this pixmap * @param pix the pixmap data to store in the cache * @param id a name that identifies the caller class of this function in an unique fashion. * This is needed to limit disk writes of the cache. * If an image with the same id changes quickly, * only the last size where insertIntoCache was called is actually stored on disk * @since 4.3 **/ void insertIntoCache(const QString& key, const QPixmap& pix, const QString& id); /** * Sets the maximum size of the cache (in kilobytes). If cache gets bigger * the limit then some entries are removed * Setting cache limit to 0 disables automatic cache size limiting. * * Note that the cleanup might not be done immediately, so the cache might * temporarily (for a few seconds) grow bigger than the limit. **/ void setCacheLimit(int kbytes); /** * Tries to load the rect of a sub element from a disk cache * * @param image path of the image we want to check * @param element sub element we want to retrieve * @param rect output parameter of the element rect found in cache * if not found or if we are sure it doesn't exist it will be QRect() * @return true if the element was found in cache or if we are sure the element doesn't exist **/ bool findInRectsCache(const QString &image, const QString &element, QRectF &rect) const; /** * Returns a list of all keys of cached rects for the given image. * * @param image path of the image for which the keys should be returned * * @return a QStringList whose elements are the entry keys in the rects cache * * @since 4.6 */ QStringList listCachedRectKeys(const QString &image) const; /** * Inserts a rectangle of a sub element of an image into a disk cache * * @param image path of the image we want to insert information * @param element sub element we want insert the rect * @param rect element rectangle **/ void insertIntoRectsCache(const QString& image, const QString &element, const QRectF &rect); /** * Discards all the information about a given image from the rectangle disk cache * * @param image the path to the image the cache is assoiated with **/ void invalidateRectsCache(const QString &image); /** * Frees up memory used by cached information for a given image without removing * the permenant record of it on disk. * @see invalidateRectsCache * * @param image the path to the image the cache is assoiated with */ void releaseRectsCache(const QString &image); /** * @return the default homepage to use in conjunction with the branding svg content * @since 4.7 */ KUrl homepage() const; Q_SIGNALS: /** * Emitted when the user changes the theme. SVGs should be reloaded at * that point */ void themeChanged(); public Q_SLOTS: /** * Notifies the Theme object that the theme settings have changed * and should be read from the config file **/ void settingsChanged(); private: friend class ThemeSingleton; friend class ThemePrivate; ThemePrivate *const d; Q_PRIVATE_SLOT(d, void compositingChanged(bool)) Q_PRIVATE_SLOT(d, void colorsChanged()) Q_PRIVATE_SLOT(d, void blurBehindChanged(bool blur)) Q_PRIVATE_SLOT(d, void settingsFileChanged(const QString &)) Q_PRIVATE_SLOT(d, void scheduledCacheUpdate()) Q_PRIVATE_SLOT(d, void onAppExitCleanup()) }; } // Plasma namespace #endif // multiple inclusion guard