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 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:
- 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 Motif style, active() and inactive() look the same. In Windows
2000 style and Macintosh Platinum style, the two styles look
slightly different.
There are setActive(), setInactive(), and setDisabled() functions
to modify the palette. (Qt also supports a normal() group; this is
an obsolete alias for active(), supported for backwards
compatibility.)
Colors and brushes can be set for particular roles in any of a
palette's color groups with setColor() and setBrush().
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::palette, QColorGroup, QColor, Widget Appearance and Style, Graphics Classes, Image Processing Classes, and Implicitly and Explicitly Shared Classes.
Member Type Documentation
QPalette::ColorGroup
- QPalette::Disabled
- QPalette::Active
- QPalette::Inactive
- QPalette::NColorGroups
- QPalette::Normal - synonym for Active
Member Function Documentation
QPalette::QPalette ()
Constructs a palette that consists of color groups with only black
colors.
QPalette::QPalette ( const QColor & button )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
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.
QPalette::QPalette ( const QColor & button, const QColor & background )
Constructs a palette from a button color and a background.
The other colors are automatically calculated, based on these
colors.
QPalette::QPalette ( const QColorGroup & active, const QColorGroup & disabled, const QColorGroup & inactive )
Constructs a palette that consists of the three color groups active, disabled and inactive. See the Detailed Description for definitions of the color groups
and QColorGroup::ColorRole for definitions of each color role
in the three groups.
See also QColorGroup and QColorGroup::ColorRole.
QPalette::QPalette ( const QPalette & p )
Constructs a copy of p.
This constructor is fast (it uses copy-on-write).
QPalette::~QPalette ()
Destroys the palette.
const QColorGroup & QPalette::active () const
Returns the active color group of this palette.
See also QColorGroup, setActive(), inactive(), and disabled().
Examples: themes/metal.cpp and themes/wood.cpp.
Returns the brush in color group gr, used for color role r.
See also color(), setBrush(), and QColorGroup::ColorRole.
Returns the color in color group gr, used for color role r.
See also brush(), setColor(), and QColorGroup::ColorRole.
QPalette QPalette::copy () const
Returns a deep copy of this palette.
Warning: This is slower than the copy constructor and assignment
operator and offers no benefits.
const QColorGroup & QPalette::disabled () const
Returns the disabled color group of this palette.
See also QColorGroup, setDisabled(), active(), and inactive().
Examples: themes/metal.cpp and themes/wood.cpp.
const QColorGroup & QPalette::inactive () const
Returns the inactive color group of this palette.
See also QColorGroup, setInactive(), active(), and disabled().
bool QPalette::isCopyOf ( const QPalette & p )
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==().
const QColorGroup & QPalette::normal () const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns the active color group. Use active() instead.
See also setActive() and active().
bool QPalette::operator!= ( const QPalette & p ) const
Returns TRUE (slowly) if this palette is different from p;
otherwise returns FALSE (usually quickly).
QPalette & QPalette::operator= ( const QPalette & p )
Assigns p to this palette and returns a reference to this
palette.
This is fast (it uses copy-on-write).
See also copy().
bool QPalette::operator== ( const QPalette & p ) const
Returns TRUE (usually quickly) if this palette is equal to p;
otherwise returns FALSE (slowly).
int QPalette::serialNumber () const
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.
void QPalette::setActive ( const QColorGroup & g )
Sets the Active color group to g.
See also active(), setDisabled(), setInactive(), and QColorGroup.
Sets the brush in color group gr, used for color role r, to
b.
See also brush(), setColor(), and QColorGroup::ColorRole.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Sets the brush in for color role r in all three color groups to
b.
See also brush(), setColor(), QColorGroup::ColorRole, active(), inactive(), and disabled().
Sets the brush in color group gr, used for color role r, to
the solid color c.
See also setBrush(), color(), and QColorGroup::ColorRole.
Example: themes/themes.cpp.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Sets the brush color used for color role r to color c in all
three color groups.
See also color(), setBrush(), and QColorGroup::ColorRole.
void QPalette::setDisabled ( const QColorGroup & g )
Sets the Disabled color group to g.
See also disabled(), setActive(), and setInactive().
void QPalette::setInactive ( const QColorGroup & g )
Sets the Inactive color group to g.
See also active(), setDisabled(), setActive(), and QColorGroup.
void QPalette::setNormal ( const QColorGroup & cg )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Sets the active color group to cg. Use setActive() instead.
See also setActive() and active().
Related Functions
Writes the palette, p to the stream s and returns a
reference to the stream.
See also Format of the QDataStream operators.
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.
This file is part of the Qt toolkit.
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