398 lines
15 KiB
C++
398 lines
15 KiB
C++
/*
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* Copyright 2006-2007 Aaron Seigo <aseigo@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 <QtCore/QObject>
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#include <QFont>
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#include <QFontMetrics>
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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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/**
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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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* Accessed via Plasma::Theme::defaultTheme() e.g:
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* \code
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* QString imagePath = Plasma::Theme::defaultTheme()->imagePath("widgets/clock")
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* \endcode
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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)
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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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HighlightColor = 1, /**< the text higlight color to be used by items resting
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on the background */
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BackgroundColor = 2, /**< the default background color */
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ButtonTextColor = 4, /** text color for buttons */
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ButtonBackgroundColor = 8, /** background color for buttons*/
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LinkColor = 16, /** color for clickable links */
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VisitedLinkColor = 32, /** color visited clickable links */
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ButtonHoverColor = 64, /** color for hover effect on buttons */
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ButtonFocusColor = 128, /** color for focus effect on buttons */
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ViewTextColor = 256, /** text color for views */
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ViewBackgroundColor = 512, /** background color for views */
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ViewHoverColor = 1024, /** color for hover effect on view */
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ViewFocusColor = 2048 /** color for focus effect on view */
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};
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enum FontRole {
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DefaultFont = 0, /**< The standard text font */
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DesktopFont, /**< The standard text font */
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SmallestFont /**< The smallest readable font */
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};
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/**
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* Singleton pattern accessor
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**/
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static Theme *defaultTheme();
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/**
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* Default constructor. Usually you want to use the singleton instead.
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* @see defaultTheme
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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. Usually you want to use the singleton instead.
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* @see defaultTheme
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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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* @return a list of all known themes
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* @since 4.3
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*/
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static KPluginInfo::List listThemeInfo();
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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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Q_INVOKABLE 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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Q_INVOKABLE QString wallpaperPath(const QSize &size = QSize()) 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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Q_INVOKABLE 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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Q_INVOKABLE 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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*/
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Q_INVOKABLE QColor color(ColorRole role) const;
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/**
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* Sets the default font to be used with themed items. Defaults to
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* the application wide default font.
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*
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* @param font the new font
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* @param role which role (usage pattern) to set the font for
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*/
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Q_INVOKABLE void setFont(const QFont &font, FontRole role = DefaultFont);
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/**
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* Returns the font to be used by themed items
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*
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* @param role which role (usage pattern) to get the font for
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*/
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Q_INVOKABLE QFont font(FontRole role) const;
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/**
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* @return the font metrics for the font to be used by themed items
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*/
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Q_INVOKABLE QFontMetrics fontMetrics() const;
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/**
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* @return true if the window manager effects (e.g. translucency, compositing) is active or not
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*/
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Q_INVOKABLE bool windowTranslucencyEnabled() 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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* @return true if the native widget styles should be used instead of themed
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* widgets. Defaults is false.
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*/
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bool useNativeWidgetStyle() 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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Q_INVOKABLE 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 the default homepage to use in conjunction with the branding svg content
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* @since 4.7
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*/
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QUrl homepage() const;
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/**
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* @return the default tool tip delay; -1 means "no tooltips"
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*/
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int toolTipDelay() 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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public Q_SLOTS:
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/**
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* Notifies the Theme object that the theme settings have changed
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* and should be read from the config file
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**/
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void settingsChanged();
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private:
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friend class ThemeSingleton;
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friend class ThemePrivate;
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ThemePrivate *const d;
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Q_PRIVATE_SLOT(d, void compositingChanged(bool))
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Q_PRIVATE_SLOT(d, void colorsChanged())
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Q_PRIVATE_SLOT(d, void blurBehindChanged(bool blur))
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Q_PRIVATE_SLOT(d, void settingsFileChanged(const QString &))
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Q_PRIVATE_SLOT(d, void scheduledCacheUpdate())
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Q_PRIVATE_SLOT(d, void onAppExitCleanup())
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Q_PRIVATE_SLOT(d, void notifyOfChanged())
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};
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} // Plasma namespace
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#endif // multiple inclusion guard
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