SchemeManager
#include <schememanager.h>
Public Types | |
enum | BackgroundRole { NormalBackground = 0 , AlternateBackground = 1 , ActiveBackground = 2 , LinkBackground = 3 , VisitedBackground = 4 , NegativeBackground = 5 , NeutralBackground = 6 , PositiveBackground = 7 } |
enum | ColorSet { View , Window , Button , Selection , Tooltip , Complementary } |
enum | DecorationRole { FocusColor , HoverColor } |
enum | ForegroundRole { NormalText = 0 , InactiveText = 1 , ActiveText = 2 , LinkText = 3 , VisitedText = 4 , NegativeText = 5 , NeutralText = 6 , PositiveText = 7 } |
enum | ShadeRole { LightShade , MidlightShade , MidShade , DarkShade , ShadowShade } |
Public Member Functions | |
SchemeManager (const SchemeManager &) | |
SchemeManager (QPalette::ColorGroup, ColorSet=View, KSharedConfigPtr=KSharedConfigPtr()) | |
QBrush | background (BackgroundRole=NormalBackground) const |
QBrush | decoration (DecorationRole) const |
QBrush | foreground (ForegroundRole=NormalText) const |
SchemeManager & | operator= (const SchemeManager &) |
QColor | shade (ShadeRole) const |
Static Public Member Functions | |
static void | adjustBackground (QPalette &, BackgroundRole newRole=NormalBackground, QPalette::ColorRole color=QPalette::Base, ColorSet set=View, KSharedConfigPtr=KSharedConfigPtr()) |
static void | adjustForeground (QPalette &, ForegroundRole newRole=NormalText, QPalette::ColorRole color=QPalette::Text, ColorSet set=View, KSharedConfigPtr=KSharedConfigPtr()) |
static int | contrast () |
static qreal | contrastF (const KSharedConfigPtr &config=KSharedConfigPtr()) |
static QPalette | createApplicationPalette (const KSharedConfigPtr &config) |
static QColor | shade (const QColor &, ShadeRole) |
static QColor | shade (const QColor &, ShadeRole, qreal contrast, qreal chromaAdjust=0.0) |
Detailed Description
A set of methods used to work with colors.
SchemeManager currently provides access to the system color palette that the user has selected (in the future, it is expected to do more). It greatly expands on QPalette by providing five distinct "sets" with several color choices each, covering background, foreground, and decoration colors.
A SchemeManager instance represents colors corresponding to a "set", where a set consists of those colors used to draw a particular type of element, such as a menu, button, view, selected text, or tooltip. Each set has a distinct set of colors, so you should always use the correct set for drawing and never assume that a particular foreground for one set is the same as the foreground for any other set. Individual colors may be quickly referenced by creating an anonymous instance and invoking a lookup member.
- Note
- The color palettes for the various states of a widget (active, inactive, disabled) may be wildly different. Therefore, it is important to take the state into account. This is why the SchemeManager constructor requires a QPalette::ColorGroup as an argument.
To facilitate working with potentially-varying states, two convenience API's are provided. These are SchemeManager::adjustBackground and its sister SchemeManager::adjustForeground, and the helper class KStatefulBrush.
- See also
- SchemeManager::ColorSet, SchemeManager::ForegroundRole, SchemeManager::BackgroundRole, SchemeManager::DecorationRole, SchemeManager::ShadeRole
Definition at line 52 of file schememanager.h.
Member Enumeration Documentation
◆ BackgroundRole
This enumeration describes the background color being selected from the given set.
Background colors are suitable for drawing under text, and should never be used to draw text. In combination with one of the overloads of SchemeManager::shade, they may be used to generate colors for drawing frames, bevels, and similar decorations.
Enumerator | |
---|---|
NormalBackground | Normal background. |
AlternateBackground | Alternate background; for example, for use in lists. This color may be the same as BackgroundNormal, especially in sets other than View and Window. |
ActiveBackground | Third color; for example, items which are new, active, requesting attention, etc. Alerting the user that a certain field must be filled out would be a good usage (although NegativeBackground could be used to the same effect, depending on what you are trying to achieve). Unlike ActiveText, this should not be used for mouseover effects. |
LinkBackground | Fourth color; corresponds to (unvisited) links. Exactly what this might be used for is somewhat harder to qualify; it might be used for bookmarks, as a 'you can click here' indicator, or to highlight recent content (i.e. in a most-recently-accessed list). |
VisitedBackground | Fifth color; corresponds to visited links. This can also be used to indicate "not recent" content, especially when a color is needed to denote content which is "old" or "archival". |
NegativeBackground | Sixth color; for example, errors, untrusted content, etc. |
NeutralBackground | Seventh color; for example, warnings, secure/encrypted content. |
PositiveBackground | Eigth color; for example, success messages, trusted content. |
Definition at line 123 of file schememanager.h.
◆ ColorSet
This enumeration describes the color set for which a color is being selected.
Color sets define a color "environment", suitable for drawing all parts of a given region. Colors from different sets should not be combined.
Enumerator | |
---|---|
View | Views; for example, frames, input fields, etc. If it contains things that can be selected, it is probably a View. |
Window | Non-editable window elements; for example, menus. If it isn't a Button, View, or Tooltip, it is probably a Window. |
Button | Buttons and button-like controls. In addition to buttons, "button-like" controls such as non-editable dropdowns, scrollbar sliders, slider handles, etc. should also use this role. |
Selection | Selected items in views. Note that unfocused or disabled selections should use the Window role. This makes it more obvious to the user that the view containing the selection does not have input focus. |
Tooltip | Tooltips. The tooltip set can often be substituted for the view set when editing is not possible, but the Window set is deemed inappropriate. "What's This" help is an excellent example, another might be pop-up notifications (depending on taste). |
Complementary | Complementary areas. Some applications want some areas to have a different color scheme. Usually dark areas over a light theme. For instance the fullscreen UI of a picture viewer, or the logout/lock screen of the plasma workspace ask for a dark color scheme even on light themes.
|
Definition at line 63 of file schememanager.h.
◆ DecorationRole
This enumeration describes the decoration color being selected from the given set.
Decoration colors are used to draw decorations (such as frames) for special purposes. Like color shades, they are neither foreground nor background colors. Text should not be painted over a decoration color, and decoration colors should not be used to draw text.
Enumerator | |
---|---|
FocusColor | Color used to draw decorations for items which have input focus. |
HoverColor | Color used to draw decorations for items which will be activated by clicking. |
Definition at line 250 of file schememanager.h.
◆ ForegroundRole
This enumeration describes the foreground color being selected from the given set.
Foreground colors are suitable for drawing text or glyphs (such as the symbols on window decoration buttons, assuming a suitable background brush is used), and should never be used to draw backgrounds.
For window decorations, the following is suggested, but not set in stone:
- Maximize - PositiveText
- Minimize - NeutralText
- Close - NegativeText
- WhatsThis - LinkText
- Sticky - ActiveText
Definition at line 193 of file schememanager.h.
◆ ShadeRole
This enumeration describes the color shade being selected from the given set.
Color shades are used to draw "3d" elements, such as frames and bevels. They are neither foreground nor background colors. Text should not be painted over a shade, and shades should not be used to draw text.
Definition at line 271 of file schememanager.h.
Constructor & Destructor Documentation
◆ SchemeManager() [1/2]
SchemeManager::SchemeManager | ( | const SchemeManager & | other | ) |
Construct a copy of another SchemeManager.
Definition at line 884 of file schememanager.cpp.
◆ ~SchemeManager()
|
virtual |
Definition at line 888 of file schememanager.cpp.
◆ SchemeManager() [2/2]
|
explicit |
Construct a palette from given color set and state, using the colors from the given KConfig (if null, the system colors are used).
Definition at line 898 of file schememanager.cpp.
Member Function Documentation
◆ adjustBackground()
|
static |
Adjust a QPalette by replacing the specified QPalette::ColorRole with the requested background color for all states.
Using this method is safer than replacing individual states, as it insulates you against changes in QPalette::ColorGroup.
- Note
- Although it is possible to replace a foreground color using this method, it's bad usability to do so. Just say "no".
Definition at line 1051 of file schememanager.cpp.
◆ adjustForeground()
|
static |
Adjust a QPalette by replacing the specified QPalette::ColorRole with the requested foreground color for all states.
Using this method is safer than replacing individual states, as it insulates you against changes in QPalette::ColorGroup.
- Note
- Although it is possible to replace a background color using this method, it's bad usability to do so. Just say "no".
Definition at line 1059 of file schememanager.cpp.
◆ background()
QBrush SchemeManager::background | ( | BackgroundRole | role = NormalBackground | ) | const |
Retrieve the requested background brush.
Definition at line 966 of file schememanager.cpp.
◆ contrast()
|
static |
Returns the contrast for borders.
- Returns
- the contrast (between 0 for minimum and 10 for maximum contrast)
Definition at line 947 of file schememanager.cpp.
◆ contrastF()
|
static |
Returns the contrast for borders as a floating point value.
- Parameters
-
config pointer to the config from which to read the contrast setting (the default is to use KSharedConfig::openConfig())
- Returns
- the contrast (between 0.0 for minimum and 1.0 for maximum contrast)
Definition at line 954 of file schememanager.cpp.
◆ createApplicationPalette()
|
static |
Used to obtain the QPalette that will be used to set the application palette from KDE Platform theme.
- Parameters
-
config KConfig from which to load the colors
- Returns
- the QPalette
Definition at line 1067 of file schememanager.cpp.
◆ decoration()
QBrush SchemeManager::decoration | ( | DecorationRole | role | ) | const |
Retrieve the requested decoration brush.
Definition at line 976 of file schememanager.cpp.
◆ foreground()
QBrush SchemeManager::foreground | ( | ForegroundRole | role = NormalText | ) | const |
Retrieve the requested foreground brush.
Definition at line 971 of file schememanager.cpp.
◆ operator=()
SchemeManager & SchemeManager::operator= | ( | const SchemeManager & | other | ) |
Standard assignment operator.
Definition at line 892 of file schememanager.cpp.
◆ shade() [1/3]
Retrieve the requested shade color, using the specified color as the base color and the system contrast setting.
- Note
- Shades are chosen such that all shades would contrast with the base color. This means that if base is very dark, the 'dark' shades will be lighter than the base color, with midlight() == shadow(). Conversely, if the base color is very light, the 'light' shades will be darker than the base color, with light() == mid().
Definition at line 986 of file schememanager.cpp.
◆ shade() [2/3]
|
static |
Retrieve the requested shade color, using the specified color as the base color and the specified contrast.
- Parameters
-
color The base color role The shade role contrast Amount roughly specifying the contrast by which to adjust the base color, between -1.0 and 1.0 (values between 0.0 and 1.0 correspond to the value from SchemeManager::contrastF) chromaAdjust (optional) Amount by which to adjust the chroma of the shade (1.0 means no adjustment)
- Note
- Shades are chosen such that all shades would contrast with the base color. This means that if base is very dark, the 'dark' shades will be lighter than the base color, with midlight() == shadow(). Conversely, if the base color is very light, the 'light' shades will be darker than the base color, with light() == mid().
Definition at line 991 of file schememanager.cpp.
◆ shade() [3/3]
Retrieve the requested shade color, using SchemeManager::background(SchemeManager::NormalBackground) as the base color and the contrast setting from the KConfig used to create this SchemeManager instance (the system contrast setting, if no KConfig was specified).
- Note
- Shades are chosen such that all shades would contrast with the base color. This means that if base is very dark, the 'dark' shades will be lighter than the base color, with midlight() == shadow(). Conversely, if the base color is very light, the 'light' shades will be darker than the base color, with light() == mid().
Definition at line 981 of file schememanager.cpp.
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