433 lines
16 KiB
C++
433 lines
16 KiB
C++
/*
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* Copyright 2006-2007 Aaron Seigo <aseigo@kde.org>
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* Copyright 2013 Marco Martin <mart@kde.org>
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*
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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_THEME_H
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#define PLASMA_THEME_H
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#include <QGuiApplication>
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#include <QFont>
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#include <QtCore/QObject>
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#include <kplugininfo.h>
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#include <ksharedconfig.h>
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#include <plasma/plasma_export.h>
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namespace Plasma
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{
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class ThemePrivate;
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class SvgPrivate;
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/**
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* @class Theme plasma/theme.h <Plasma/Theme>
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*
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* @short Interface to the Plasma theme
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*
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*
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* Plasma::Theme provides access to a common and standardized set of graphic
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* elements stored in SVG format. This allows artists to create single packages
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* of SVGs that will affect the look and feel of all workspace components.
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*
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* Plasma::Svg uses Plasma::Theme internally to locate and load the appropriate
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* SVG data. Alternatively, Plasma::Theme can be used directly to retrieve
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* file system paths to SVGs by name.
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*/
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class PLASMA_EXPORT Theme : public QObject
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{
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Q_OBJECT
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Q_PROPERTY(QString themeName READ themeName NOTIFY themeChanged)
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Q_PROPERTY(bool useGlobalSettings READ useGlobalSettings NOTIFY themeChanged)
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Q_PROPERTY(QString wallpaperPath READ wallpaperPath NOTIFY themeChanged)
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//fonts
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Q_PROPERTY(QFont defaultFont READ defaultFont NOTIFY defaultFontChanged)
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Q_PROPERTY(QFont smallestFont READ smallestFont NOTIFY smallestFontChanged)
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// stylesheet
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Q_PROPERTY(QString styleSheet READ styleSheet NOTIFY themeChanged)
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public:
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enum ColorRole {
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TextColor = 0, /**< the text color to be used by items resting on the background */
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BackgroundColor = 1, /**< the default background color */
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HighlightColor = 2, /**< the text highlight color to be used by items resting
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on the background */
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HoverColor = 3, /**< color for hover effect on view */
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FocusColor = 4, /**< color for focus effect on view */
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LinkColor = 5, /**< color for clickable links */
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VisitedLinkColor = 6, /**< color visited clickable links */
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HighlightedTextColor = 7,/**< color contrasting with HighlightColor, to be used for instance with */
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PositiveTextColor = 8, /**< color of foreground objects with a "positive message" connotation (usually green) */
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NeutralTextColor = 9, /**< color of foreground objects with a "neutral message" connotation (usually yellow) */
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NegativeTextColor = 10 /**< color of foreground objects with a "negative message" connotation (usually red) */
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};
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enum ColorGroup {
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NormalColorGroup = 0,
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ButtonColorGroup = 1,
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ViewColorGroup = 2,
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ComplementaryColorGroup = 3
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};
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Q_ENUM(ColorGroup)
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/**
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* Default constructor. It will be the global theme configured in plasmarc
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* @param parent the parent object
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*/
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explicit Theme(QObject *parent = 0);
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/**
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* Construct a theme. It will be a custom theme instance of themeName.
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* @param themeName the name of the theme to create
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* @param parent the parent object
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* @since 4.3
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*/
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explicit Theme(const QString &themeName, QObject *parent = 0);
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~Theme();
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/**
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* Sets the current theme being used.
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*/
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void setThemeName(const QString &themeName);
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/**
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* @return the name of the theme.
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*/
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QString themeName() const;
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/**
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* Retrieve the path for an SVG image in the current theme.
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*
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* @param name the name of the file in the theme directory (without the
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* ".svg" part or a leading slash)
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* @return the full path to the requested file for the current theme
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*/
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QString imagePath(const QString &name) const;
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/**
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* Retrieves the default wallpaper associated with this theme.
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*
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* @param size the target height and width of the wallpaper; if an invalid size
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* is passed in, then a default size will be provided instead.
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* @return the full path to the wallpaper image
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*/
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QString wallpaperPath(const QSize &size = QSize()) const;
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Q_INVOKABLE QString wallpaperPathForSize(int width = -1, int height = -1) const;
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/**
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* Checks if this theme has an image named in a certain way
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*
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* @param name the name of the file in the theme directory (without the
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* ".svg" part or a leading slash)
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* @return true if the image exists for this theme
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*/
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bool currentThemeHasImage(const QString &name) const;
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/**
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* Returns the color scheme configurationthat goes along this theme.
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* This can be used with KStatefulBrush and KColorScheme to determine
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* the proper colours to use along with the visual elements in this theme.
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*/
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KSharedConfigPtr colorScheme() const;
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/**
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* Returns the text color to be used by items resting on the background
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*
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* @param role which role (usage pattern) to get the color for
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* @param group which group we want a color of
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*/
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QColor color(ColorRole role, ColorGroup group = NormalColorGroup) const;
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/**
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* Tells the theme whether to follow the global settings or use application
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* specific settings
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*
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* @param useGlobal pass in true to follow the global settings
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*/
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void setUseGlobalSettings(bool useGlobal);
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/**
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* @return true if the global settings are followed, false if application
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* specific settings are used.
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*/
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bool useGlobalSettings() const;
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/**
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* Provides a Plasma::Theme-themed stylesheet for hybrid (web / native Plasma) widgets.
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*
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* You can use this method to retrieve a basic default stylesheet, or to theme your
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* custom stylesheet you use for example in Plasma::WebView. The QString you can pass
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* into this method does not have to be a valid stylesheet, in fact you can use this
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* method to replace color placeholders with the theme's color in any QString.
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*
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* In order to use this method with a custom stylesheet, just put for example %textcolor
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* in your QString and it will be replaced with the theme's text (or foreground) color.
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*
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* Just like in many other methods for retrieving theme information, do not forget to
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* update your stylesheet upon the themeChanged() signal.
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*
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* The following tags will be replaced by corresponding colors from Plasma::Theme:
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*
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* %textcolor
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* %backgroundcolor
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* %buttonbackgroundcolor
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*
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* %link
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* %activatedlink
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* %hoveredlink
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* %visitedlink
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*
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* %fontfamily
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* %fontsize
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* %smallfontsize
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*
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* @param css a stylesheet to theme, leave empty for a default stylesheet containing
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* theming for some commonly used elements, body text and links, for example.
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*
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* @return a piece of CSS that sets the most commonly used style elements to a theme
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* matching Plasma::Theme.
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*
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* @since 4.5
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*/
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QString styleSheet(const QString &css = QString()) const;
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/**
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* This is an overloaded member provided to check with file timestamp
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* where cache is still valid.
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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 pix the pixmap 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, QPixmap &pix, unsigned int lastModified = 0);
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/**
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* Insert specified pixmap into the cache.
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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 to use in the cache for this pixmap
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* @param pix the pixmap data to store in the cache
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**/
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void insertIntoCache(const QString &key, const QPixmap &pix);
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/**
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* Insert specified pixmap into the cache.
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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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* The actual insert is delayed for optimization reasons and the id
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* parameter is used to discard repeated inserts in the delay time, useful
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* when for instance the graphics to inser comes from a quickly resizing
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* object: the frames between the start and destination sizes aren't
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* useful in the cache and just cause overhead.
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*
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* @param key the name to use in the cache for this pixmap
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* @param pix the pixmap data to store in the cache
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* @param id a name that identifies the caller class of this function in an unique fashion.
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* This is needed to limit disk writes of the cache.
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* If an image with the same id changes quickly,
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* only the last size where insertIntoCache was called is actually stored on disk
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* @since 4.3
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**/
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void insertIntoCache(const QString &key, const QPixmap &pix, const QString &id);
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/**
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* Sets the maximum size of the cache (in kilobytes). If cache gets bigger
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* the limit then some entries are removed
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* Setting cache limit to 0 disables automatic cache size limiting.
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*
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* Note that the cleanup might not be done immediately, so the cache might
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* temporarily (for a few seconds) grow bigger than the limit.
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**/
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void setCacheLimit(int kbytes);
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/**
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* Tries to load the rect of a sub element from a disk cache
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*
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* @param image path of the image we want to check
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* @param element sub element we want to retrieve
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* @param rect output parameter of the element rect found in cache
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* if not found or if we are sure it doesn't exist it will be QRect()
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* @return true if the element was found in cache or if we are sure the element doesn't exist
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**/
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bool findInRectsCache(const QString &image, const QString &element, QRectF &rect) const;
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/**
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* Returns a list of all keys of cached rects for the given image.
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*
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* @param image path of the image for which the keys should be returned
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*
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* @return a QStringList whose elements are the entry keys in the rects cache
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*
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* @since 4.6
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*/
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QStringList listCachedRectKeys(const QString &image) const;
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/**
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* Inserts a rectangle of a sub element of an image into a disk cache
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*
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* @param image path of the image we want to insert information
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* @param element sub element we want insert the rect
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* @param rect element rectangle
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**/
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void insertIntoRectsCache(const QString &image, const QString &element, const QRectF &rect);
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/**
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* Discards all the information about a given image from the rectangle disk cache
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*
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* @param image the path to the image the cache is assoiated with
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**/
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void invalidateRectsCache(const QString &image);
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/**
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* Frees up memory used by cached information for a given image without removing
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* the permenant record of it on disk.
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* @see invalidateRectsCache
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*
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* @param image the path to the image the cache is assoiated with
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*/
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void releaseRectsCache(const QString &image);
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/**
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* @return plugin info for this theme, with informations such as
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* name, description, author, website etc
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* @since 5.0
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*/
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KPluginInfo pluginInfo() const;
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/**
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* @return The default application font
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* @since 5.0
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*/
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QFont defaultFont() const;
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/**
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* @return The smallest readable font
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* @since 5.0
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*/
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QFont smallestFont() const;
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/** This method allows Plasma to enable and disable the background
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* contrast effect for a given theme, improving readability. The
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* value is read from the "enabled" key in the "ContrastEffect"
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* group in the Theme's metadata file.
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* The configuration in the metadata.desktop file of the theme
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* could look like this (for a lighter background):
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* \code
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* [ContrastEffect]
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* enabled=true
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* contrast=0.45
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* intensity=0.45
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* saturation=1.7
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* \endcode
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* @return Whether or not to enable the contrasteffect
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* @since 5.0
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*/
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bool backgroundContrastEnabled() const;
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/** This method allows Plasma to set a background contrast effect
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* for a given theme, improving readability. The value is read
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* from the "contrast" key in the "ContrastEffect" group in the
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* Theme's metadata file.
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* @return The contrast provided to the contrasteffect
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* @since 5.0
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* @see backgroundContrastEnabled
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*/
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qreal backgroundContrast() const;
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/** This method allows Plasma to set a background contrast effect
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* for a given theme, improving readability. The value is read
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* from the "intensity" key in the "ContrastEffect" group in the
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* Theme's metadata file.
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* @return The intensity provided to the contrasteffect
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* @since 5.0
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* @see backgroundContrastEnabled
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*/
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qreal backgroundIntensity() const;
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/** This method allows Plasma to set a background contrast effect
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* for a given theme, improving readability. The value is read
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* from the "saturation" key in the "ContrastEffect" group in the
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* Theme's metadata file.
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* @return The saturation provided to the contrasteffect
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* @since 5.0
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* @see backgroundContrastEnabled
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*/
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qreal backgroundSaturation() const;
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/**
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* Returns the size of the letter "M" as rendered on the screen with the given font.
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* This values gives you a base size that:
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* * scales dependent on the DPI of the screen
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* * Scales with the default font as set by the user
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* You can use it like this in QML Items:
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* \code
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* Item {
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* width: theme.mSize(theme.defaultFont).height
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* height: width
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* }
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* \endcode
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* This allows you to dynamically scale elements of your user interface with different font settings and
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* different physical outputs (with different DPI).
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* @param font The font to use for the metrics.
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* @return The size of the letter "M" as rendered on the screen with the given font.
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* @since 5.0
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*/
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Q_INVOKABLE QSizeF mSize(const QFont &font = QGuiApplication::font()) const;
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QString backgroundPath(const QString &image) const;
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Q_SIGNALS:
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/**
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* Emitted when the user changes the theme. Stylesheet usage, colors, etc. should
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* be updated at this point. However, SVGs should *not* be repainted in response
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* to this signal; connect to Svg::repaintNeeded() instead for that, as Svg objects
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* need repainting not only when themeChanged() is emitted; moreover Svg objects
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* connect to and respond appropriately to themeChanged() internally, emitting
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* Svg::repaintNeeded() at an appropriate time.
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*/
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void themeChanged();
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/** Notifier for change of defaultFont property */
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void defaultFontChanged();
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/** Notifier for change of smallestFont property */
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void smallestFontChanged();
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private:
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friend class SvgPrivate;
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friend class FrameSvg;
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friend class FrameSvgPrivate;
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friend class ThemePrivate;
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ThemePrivate *d;
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};
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} // Plasma namespace
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#endif // multiple inclusion guard
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