QPalette Class
The QPalette class contains color groups for each widget state. More...
Header: | #include <QPalette> |
qmake: | QT += gui |
Public Types
enum | ColorGroup { Disabled, Active, Inactive, Normal } |
enum | ColorRole { Window, Background, WindowText, Foreground, ..., NoRole } |
Public Functions
QPalette() | |
QPalette(const QColor &button) | |
QPalette(Qt::GlobalColor button) | |
QPalette(const QColor &button, const QColor &window) | |
QPalette(const QBrush &windowText, const QBrush &button, const QBrush &light, const QBrush &dark, const QBrush &mid, const QBrush &text, const QBrush &bright_text, const QBrush &base, const QBrush &window) | |
QPalette(const QPalette &p) | |
QPalette(QPalette &&other) | |
~QPalette() | |
const QBrush & | alternateBase() const |
const QBrush & | background() const |
const QBrush & | base() const |
const QBrush & | brightText() const |
const QBrush & | brush(QPalette::ColorGroup cg, QPalette::ColorRole cr) const |
const QBrush & | brush(QPalette::ColorRole cr) const |
const QBrush & | button() const |
const QBrush & | buttonText() const |
qint64 | cacheKey() const |
const QColor & | color(QPalette::ColorGroup cg, QPalette::ColorRole cr) const |
const QColor & | color(QPalette::ColorRole cr) const |
QPalette::ColorGroup | currentColorGroup() const |
const QBrush & | dark() const |
const QBrush & | foreground() const |
const QBrush & | highlight() const |
const QBrush & | highlightedText() const |
bool | isBrushSet(QPalette::ColorGroup cg, QPalette::ColorRole cr) const |
bool | isCopyOf(const QPalette &p) const |
bool | isEqual(QPalette::ColorGroup cr1, QPalette::ColorGroup cr2) const |
const QBrush & | light() const |
const QBrush & | link() const |
const QBrush & | linkVisited() const |
const QBrush & | mid() const |
const QBrush & | midlight() const |
const QBrush & | placeholderText() const |
QPalette | resolve(const QPalette &other) const |
uint | resolve() const |
void | resolve(uint mask) |
int | serialNumber() const |
void | setBrush(QPalette::ColorRole cr, const QBrush &brush) |
void | setBrush(QPalette::ColorGroup cg, QPalette::ColorRole cr, const QBrush &brush) |
void | setColor(QPalette::ColorGroup cg, QPalette::ColorRole cr, const QColor &color) |
void | setColor(QPalette::ColorRole cr, const QColor &color) |
void | setColorGroup(QPalette::ColorGroup cg, const QBrush &windowText, const QBrush &button, const QBrush &light, const QBrush &dark, const QBrush &mid, const QBrush &text, const QBrush &bright_text, const QBrush &base, const QBrush &window) |
void | setCurrentColorGroup(QPalette::ColorGroup cg) |
const QBrush & | shadow() const |
void | swap(QPalette &other) |
const QBrush & | text() const |
const QBrush & | toolTipBase() const |
const QBrush & | toolTipText() const |
const QBrush & | window() const |
const QBrush & | windowText() const |
QVariant | operator QVariant() const |
bool | operator!=(const QPalette &p) const |
QPalette & | operator=(const QPalette &p) |
QPalette & | operator=(QPalette &&other) |
bool | operator==(const QPalette &p) const |
Static Public Members
const QMetaObject | staticMetaObject |
Related Non-Members
QDataStream & | operator<<(QDataStream &s, const QPalette &p) |
QDataStream & | operator>>(QDataStream &s, QPalette &p) |
Detailed Description
The QPalette class contains color groups for each widget state.
A palette consists of three color groups: Active, Disabled, and Inactive. All widgets in Qt contain a palette and use their palette to draw themselves. This makes the user interface easily configurable and easier to keep consistent.
If you create a new widget we strongly recommend that you use the colors in the palette rather than hard-coding specific colors.
The color groups:
- The Active group is used for the window that has keyboard focus.
- The Inactive group is used for other windows.
- The Disabled group is used for widgets (not windows) that are disabled for some reason.
Both active and inactive windows can contain disabled widgets. (Disabled widgets are often called inaccessible or grayed out.)
In most styles, Active and Inactive look the same.
Colors and brushes can be set for particular roles in any of a palette's color groups with setColor() and setBrush(). A color group contains a group of colors used by widgets for drawing themselves. We recommend that widgets use color group roles from the palette such as "foreground" and "base" rather than literal colors like "red" or "turquoise". The color roles are enumerated and defined in the ColorRole documentation.
We strongly recommend that you use the default palette of the current style (returned by QGuiApplication::palette()) and modify that as necessary. This is done by Qt's widgets when they are drawn.
To modify a color group you call the functions setColor() and setBrush(), depending on whether you want a pure color or a pixmap pattern.
There are also corresponding color() and brush() getters, and a commonly used convenience function to get the ColorRole for the current ColorGroup: window(), windowText(), base(), etc.
You can copy a palette using the copy constructor and test to see if two palettes are identical using isCopyOf().
QPalette is optimized by the use of implicit sharing, so it is very efficient to pass QPalette objects as arguments.
Warning: Some styles do not use the palette for all drawing, for instance, if they make use of native theme engines. This is the case for both the Windows Vista and the macOS styles.
See also QApplication::setPalette(), QWidget::setPalette(), and QColor.
Member Type Documentation
enum QPalette::ColorGroup
Constant | Value | Description |
---|---|---|
QPalette::Disabled | 1 | |
QPalette::Active | 0 | |
QPalette::Inactive | 2 | |
QPalette::Normal | Active | synonym for Active |
enum QPalette::ColorRole
The ColorRole enum defines the different symbolic color roles used in current GUIs.
The central roles are:
Constant | Value | Description |
---|---|---|
QPalette::Window | 10 | A general background color. |
QPalette::Background | Window | This value is obsolete. Use Window instead. |
QPalette::WindowText | 0 | A general foreground color. |
QPalette::Foreground | WindowText | This value is obsolete. Use WindowText instead. |
QPalette::Base | 9 | Used mostly as the background color for text entry widgets, but can also be used for other painting - such as the background of combobox drop down lists and toolbar handles. It is usually white or another light color. |
QPalette::AlternateBase | 16 | Used as the alternate background color in views with alternating row colors (see QAbstractItemView::setAlternatingRowColors()). |
QPalette::ToolTipBase | 18 | Used as the background color for QToolTip and QWhatsThis. Tool tips use the Inactive color group of QPalette, because tool tips are not active windows. |
QPalette::ToolTipText | 19 | Used as the foreground color for QToolTip and QWhatsThis. Tool tips use the Inactive color group of QPalette, because tool tips are not active windows. |
QPalette::PlaceholderText | 20 | Used as the placeholder color for various text input widgets. This enum value has been introduced in Qt 5.12 |
QPalette::Text | 6 | The foreground color used with Base . This is usually the same as the WindowText , in which case it must provide good contrast with Window and Base . |
QPalette::Button | 1 | The general button background color. This background can be different from Window as some styles require a different background color for buttons. |
QPalette::ButtonText | 8 | A foreground color used with the Button color. |
QPalette::BrightText | 7 | A text color that is very different from WindowText , and contrasts well with e.g. Dark . Typically used for text that needs to be drawn where Text or WindowText would give poor contrast, such as on pressed push buttons. Note that text colors can be used for things other than just words; text colors are usually used for text, but it's quite common to use the text color roles for lines, icons, etc. |
There are some color roles used mostly for 3D bevel and shadow effects. All of these are normally derived from Window
, and used in ways that depend on that relationship. For example, buttons depend on it to make the bevels look attractive, and Motif scroll bars depend on Mid
to be slightly different from Window
.
Constant | Value | Description |
---|---|---|
QPalette::Light | 2 | Lighter than Button color. |
QPalette::Midlight | 3 | Between Button and Light . |
QPalette::Dark | 4 | Darker than Button . |
QPalette::Mid | 5 | Between Button and Dark . |
QPalette::Shadow | 11 | A very dark color. By default, the shadow color is Qt::black. |
Selected (marked) items have two roles:
Constant | Value | Description |
---|---|---|
QPalette::Highlight | 12 | A color to indicate a selected item or the current item. By default, the highlight color is Qt::darkBlue. |
QPalette::HighlightedText | 13 | A text color that contrasts with Highlight . By default, the highlighted text color is Qt::white. |
There are two color roles related to hyperlinks:
Constant | Value | Description |
---|---|---|
QPalette::Link | 14 | A text color used for unvisited hyperlinks. By default, the link color is Qt::blue. |
QPalette::LinkVisited | 15 | A text color used for already visited hyperlinks. By default, the linkvisited color is Qt::magenta. |
Note that we do not use the Link
and LinkVisited
roles when rendering rich text in Qt, and that we recommend that you use CSS and the QTextDocument::setDefaultStyleSheet() function to alter the appearance of links. For example:
QTextBrowser browser; QColor linkColor(Qt::red); QString sheet = QString::fromLatin1("a { text-decoration: underline; color: %1 }").arg(linkColor.name()); browser.document()->setDefaultStyleSheet(sheet);
Constant | Value | Description |
---|---|---|
QPalette::NoRole | 17 | No role; this special role is often used to indicate that a role has not been assigned. |
Member Function Documentation
QPalette::QPalette()
Constructs a palette object that uses the application's default palette.
See also QApplication::setPalette() and QApplication::palette().
QPalette::QPalette(const QColor &button)
Constructs a palette from the button color. The other colors are automatically calculated, based on this color. Window
will be the button color as well.
QPalette::QPalette(Qt::GlobalColor button)
Constructs a palette from the button color. The other colors are automatically calculated, based on this color. Window
will be the button color as well.
QPalette::QPalette(const QColor &button, const QColor &window)
Constructs a palette from a button color and a window. The other colors are automatically calculated, based on these colors.
QPalette::QPalette(const QBrush &windowText, const QBrush &button, const QBrush &light, const QBrush &dark, const QBrush &mid, const QBrush &text, const QBrush &bright_text, const QBrush &base, const QBrush &window)
Constructs a palette. You can pass either brushes, pixmaps or plain colors for windowText, button, light, dark, mid, text, bright_text, base and window.
See also QBrush.
QPalette::QPalette(const QPalette &p)
Constructs a copy of p.
This constructor is fast thanks to implicit sharing.
QPalette::QPalette(QPalette &&other)
Move-copy constructor.
QPalette::~QPalette()
Destroys the palette.
const QBrush &QPalette::alternateBase() const
const QBrush &QPalette::background() const
const QBrush &QPalette::base() const
const QBrush &QPalette::brightText() const
const QBrush &QPalette::brush(QPalette::ColorGroup cg, QPalette::ColorRole cr) const
See also setBrush().
const QBrush &QPalette::brush(QPalette::ColorRole cr) const
const QBrush &QPalette::button() const
const QBrush &QPalette::buttonText() const
qint64 QPalette::cacheKey() const
Returns a number that identifies the contents of this QPalette object. Distinct QPalette objects can have the same key if they refer to the same contents.
The cacheKey() will change when the palette is altered.
const QColor &QPalette::color(QPalette::ColorGroup cg, QPalette::ColorRole cr) const
See also setColor().
const QColor &QPalette::color(QPalette::ColorRole cr) const
QPalette::ColorGroup QPalette::currentColorGroup() const
See also setCurrentColorGroup().
const QBrush &QPalette::dark() const
const QBrush &QPalette::foreground() const
const QBrush &QPalette::highlight() const
const QBrush &QPalette::highlightedText() const
bool QPalette::isBrushSet(QPalette::ColorGroup cg, QPalette::ColorRole cr) const
Returns true
if the ColorGroup cg and ColorRole cr has been set previously on this palette; otherwise returns false
.
This function was introduced in Qt 4.2.
See also setBrush().
bool QPalette::isCopyOf(const QPalette &p) const
Returns true
if this palette and p are copies of each other, i.e. one of them was created as a copy of the other and neither was subsequently modified; otherwise returns false
. This is much stricter than equality.
See also operator=() and operator==().
bool QPalette::isEqual(QPalette::ColorGroup cr1, QPalette::ColorGroup cr2) const
const QBrush &QPalette::light() const
const QBrush &QPalette::link() const
const QBrush &QPalette::linkVisited() const
const QBrush &QPalette::mid() const
const QBrush &QPalette::midlight() const
const QBrush &QPalette::placeholderText() const
QPalette QPalette::resolve(const QPalette &other) const
Returns a new QPalette that has attributes copied from other.
uint QPalette::resolve() const
void QPalette::resolve(uint mask)
int QPalette::serialNumber() const
void QPalette::setBrush(QPalette::ColorRole cr, const QBrush &brush)
See also brush().
void QPalette::setBrush(QPalette::ColorGroup cg, QPalette::ColorRole cr, const QBrush &brush)
void QPalette::setColor(QPalette::ColorGroup cg, QPalette::ColorRole cr, const QColor &color)
See also color().
void QPalette::setColor(QPalette::ColorRole cr, const QColor &color)
void QPalette::setColorGroup(QPalette::ColorGroup cg, const QBrush &windowText, const QBrush &button, const QBrush &light, const QBrush &dark, const QBrush &mid, const QBrush &text, const QBrush &bright_text, const QBrush &base, const QBrush &window)
Sets a the group at cg. You can pass either brushes, pixmaps or plain colors for windowText, button, light, dark, mid, text, bright_text, base and window.
See also QBrush.
void QPalette::setCurrentColorGroup(QPalette::ColorGroup cg)
See also currentColorGroup().
const QBrush &QPalette::shadow() const
void QPalette::swap(QPalette &other)
const QBrush &QPalette::text() const
const QBrush &QPalette::toolTipBase() const
const QBrush &QPalette::toolTipText() const
const QBrush &QPalette::window() const
const QBrush &QPalette::windowText() const
QVariant QPalette::operator QVariant() const
Returns the palette as a QVariant
bool QPalette::operator!=(const QPalette &p) const
QPalette &QPalette::operator=(const QPalette &p)
Assigns p to this palette and returns a reference to this palette.
This operation is fast thanks to implicit sharing.
QPalette &QPalette::operator=(QPalette &&other)
Move-assignment operator.
bool QPalette::operator==(const QPalette &p) const
Returns true
(usually quickly) if this palette is equal to p; otherwise returns false
(slowly).
Note: The current ColorGroup is not taken into account when comparing palettes
See also operator!=().
Related Non-Members
QDataStream &operator<<(QDataStream &s, const QPalette &p)
Writes the palette, p to the stream s and returns a reference to the stream.
See also Format of the QDataStream operators.
QDataStream &operator>>(QDataStream &s, QPalette &p)
Reads a palette from the stream, s into the palette p, and returns a reference to the stream.
See also Format of the QDataStream operators.