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The QPalette class contains color groups for each widget state. More...
#include <QPalette>
Inherited by QColorGroup.
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:
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 QApplication::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.
See also QApplication::setPalette(), QWidget::setPalette(), and QColor.
| Constant | Value | Description |
|---|---|---|
| QPalette::Disabled | 1 | |
| QPalette::Active | 0 | |
| QPalette::Inactive | 2 | |
| QPalette::Normal | Active | synonym for Active |
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| QPalette::Background | Window | This value is obsolete.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::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);
Constructs a palette object that uses the application's default palette.
See also QApplication::setPalette() and QApplication::palette().
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.
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.
Constructs a palette from a button color and a window. The other colors are automatically calculated, based on these colors.
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.
Constructs a copy of p.
This constructor is fast thanks to implicit sharing.
Destroys the palette.
Returns the alternate base brush of the current color group.
See also ColorRole and brush().
Returns the base brush of the current color group.
See also ColorRole and brush().
Returns the bright text foreground brush of the current color group.
See also ColorRole and brush().
Returns the brush in the specified color group, used for the given color role.
See also color(), setBrush(), and ColorRole.
This is an overloaded member function, provided for convenience.
Returns the brush that has been set for the given color role in the current ColorGroup.
See also color(), setBrush(), and ColorRole.
Returns the button brush of the current color group.
See also ColorRole and brush().
Returns the button text foreground brush of the current color group.
See also ColorRole and brush().
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.
Returns the color in the specified color group, used for the given color role.
See also brush(), setColor(), and ColorRole.
This is an overloaded member function, provided for convenience.
Returns the color that has been set for the given color role in the current ColorGroup.
See also brush() and ColorRole.
Returns the palette's current color group.
See also setCurrentColorGroup().
Returns the dark brush of the current color group.
See also ColorRole and brush().
Returns the highlight brush of the current color group.
See also ColorRole and brush().
Returns the highlighted text brush of the current color group.
See also ColorRole and brush().
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().
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==().
Returns true (usually quickly) if color group cg1 is equal to cg2; otherwise returns false.
Returns the light brush of the current color group.
See also ColorRole and brush().
Returns the unvisited link text brush of the current color group.
See also ColorRole and brush().
Returns the visited link text brush of the current color group.
See also ColorRole and brush().
Returns the mid brush of the current color group.
See also ColorRole and brush().
Returns the midlight brush of the current color group.
See also ColorRole and brush().
Returns a new QPalette that has attributes copied from other.
Sets the brush for the given color role to the specified brush for all groups in the palette.
See also brush(), setColor(), and ColorRole.
This is an overloaded member function, provided for convenience.
Sets the brush in the specified color group, used for the given color role, to brush.
See also brush(), setColor(), and ColorRole.
Sets the brush in the specified color group, used for the given color role, to the specified solid color.
See also setBrush(), color(), and ColorRole.
This is an overloaded member function, provided for convenience.
Sets the color used for the given color role, in all color groups, to the specified solid color.
See also brush(), setColor(), and ColorRole.
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.
Set the palette's current color group to cg.
See also currentColorGroup().
Returns the shadow brush of the current color group.
See also ColorRole and brush().
Returns the text foreground brush of the current color group.
See also ColorRole and brush().
Returns the window (general background) brush of the current color group.
See also ColorRole and brush().
Returns the window text (general foreground) brush of the current color group.
See also ColorRole and brush().
Returns the palette as a QVariant
Returns true (slowly) if this palette is different from p; otherwise returns false (usually quickly).
Assigns p to this palette and returns a reference to this palette.
This operation is fast thanks to implicit sharing.
Returns true (usually quickly) if this palette is equal to p; otherwise returns false (slowly).
This is an overloaded member function, provided for convenience.
Writes the palette, p to the stream s and returns a reference to the stream.
See also Format of the QDataStream operators.
This is an overloaded member function, provided for convenience.
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.
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