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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 contain a palette, and all widgets in Qt 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 Motif style, Active and Inactive look the same. In Windows 2000 style and Macintosh Platinum style, the two styles look slightly different.
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 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 a system-supplied color group and modify that as necessary.
You modify a color group by calling the access 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 each ColorRole: background(), foreground(), base(), etc.
You can copy a palette using the copy constructor and test to see if two palettes are identical using isCopyOf().
See also QApplication::setPalette(), QWidget::setPalette(), and QColor.
QPalette::Disabled | |
QPalette::Active | |
QPalette::Inactive | |
QPalette::Normal | synonym for Active |
The ColorRole enum defines the different symbolic color roles used in current GUIs.
The central roles are:
QPalette::Background | A general background color. |
QPalette::Foreground | A general foreground color. |
QPalette::Base | Used as the background color for text entry widgets; usually white or another light color. |
QPalette::Text | The foreground color used with Base. This is usually the same as the Foreground, in which case it must provide good contrast with Background and Base. |
QPalette::Button | The general button background color in which buttons need a background that is different from Background, as in the Macintosh style. |
QPalette::ButtonText | A foreground color used with the Button color. |
There are some color roles used mostly for 3D bevel and shadow effects:
QPalette::Light | Lighter than Button color. |
QPalette::Midlight | Between Button and Light. |
QPalette::Dark | Darker than Button. |
QPalette::Mid | Between Button and Dark. |
QPalette::Shadow | A very dark color. By default, the shadow color is Qt::black. |
All of these are normally derived from Background, 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 Background.
Selected (marked) items have two roles:
QPalette::Highlight | A color to indicate a selected item or the current item. By default, the highlight color is Qt::darkBlue. |
QPalette::HighlightedText | A text color that contrasts with Highlight. By default, the highlighted text color is Qt::white. |
Finally, there is a special role for text that needs to be drawn where Text or Foreground would give poor contrast, such as on pressed push buttons:
QPalette::BrightText | A text color that is very different from Foreground, and contrasts well with e.g. Dark. |
QPalette::Link | A text color used for unvisited hyperlinks. By default, the link color is Qt::blue. |
QPalette::LinkVisited | A text color used for already visited hyperlinks. By default, the linkvisited color is Qt::magenta. |
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.
This image shows most of the color roles in use:
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. Background will be the button color as well.
Constructs a palette from the button color. The other colors are automatically calculated, based on this color. Background will be the button color as well.
Constructs a palette from a button color and a background. The other colors are automatically calculated, based on these colors.
Constructs a palette. You can pass either brushes, pixmaps or plain colors for foreground, button, light, dark, mid, text, bright_text, base and background.
See also QBrush.
Constructs a copy of p.
This constructor is fast (it uses copy-on-write).
Destroys the palette.
Returns the background color of the current color group.
See also ColorRole.
Returns the base color of the current color group.
See also ColorRole.
Returns the bright text foreground color of the current color group.
See also ColorRole.
Returns the brush in color group gr, used for color role cr.
See also color(), setBrush(), and ColorRole.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Returns the brush that has been set for color role r in the current ColorGroup.
See also color(), setBrush(), and ColorRole.
Returns the button color of the current color group.
See also ColorRole.
Returns the button text foreground color of the current color group.
See also ColorRole.
Returns the color in color group gr, used for color role r.
See also brush(), setColor(), and ColorRole.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Returns the color that has been set for color role r in the current ColorGroup.
See also brush() and ColorRole.
Returns the palette's current color group.
Returns the dark color of the current color group.
See also ColorRole.
Returns the foreground color of the current color group.
See also ColorRole.
Returns the highlight color of the current color group.
See also ColorRole.
Returns the highlighted text color of the current color group.
See also ColorRole.
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 color of the current color group.
See also ColorRole.
Returns the unvisited link text color of the current color group.
See also ColorRole.
Returns the visited link text color of the current color group.
See also ColorRole.
Returns the mid color of the current color group.
See also ColorRole.
Returns the midlight color of the current color group.
See also ColorRole.
Returns a new QPalette that has attributes copied from other.
Returns a number that uniquely identifies this QPalette object. The serial number is intended for caching. Its value may not be used for anything other than equality testing.
Note that QPalette uses copy-on-write, and the serial number changes during the lazy copy operation (detach()), not during a shallow copy (copy constructor or assignment).
See also QPixmap, QPixmapCache, and QCache.
Sets the brush used to color role cr and brush brush.
See also brush(), setColor(), and ColorRole.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Sets the brush in color group cg, used for color role cr, to b.
See also brush(), setColor(), and ColorRole.
Sets the brush in color group gr, used for color role r, to the solid color c.
See also setBrush(), color(), and ColorRole.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Sets the brush used for color role r in the current ColorGroup to a solid color c.
See also brush(), setColor(), and ColorRole.
Sets a the group at cg. You can pass either brushes, pixmaps or plain colors for foreground, button, light, dark, mid, text, bright_text, base and background.
See also QBrush.
Set the palette's current color group to cg.
Returns the shadow color of the current color group.
See also ColorRole.
Returns the text foreground color of the current color group.
See also ColorRole.
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 is fast (it uses copy-on-write).
Returns true (usually quickly) if this palette is equal to p; otherwise returns false (slowly).
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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. It behaves essentially like the above function.
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.
Copyright © 2004 Trolltech. | Trademarks | Qt 4.0.0-tp2 |