QCheckBox(3qt)

NAME
QCheckBox - Check box with a text label

#include <qcheckbox.h>

Inherits QButton.

  Public Members
QCheckBox ( QWidget * parent, const char * name=0 )
QCheckBox ( const QString & text, QWidget * parent, const char * name=0 )
bool isChecked () const
void setChecked ( bool check )
void setNoChange ()
void setTristate ( bool y=TRUE )
bool isTristate () const

  Important Inherited Members
QString text () const
virtual void setText ( const QString & text )
QString text () const
const QPixmap* pixmap () const
virtual void setPixmap ( const QPixmap & pixmap )
int accel () const
virtual void setAccel ( int key )
bool isToggleButton () const
virtual void setDown ( bool enable )
bool isDown () const
bool isOn () const
bool autoRepeat () const
bool isExclusiveToggle () const
QButtonGroup* group () const
virtual void setAutoRepeat ( bool enable )
void toggle ()
void pressed ()
void released ()
void clicked ()
void toggled ( bool on )
void stateChanged ( int state )

  Properties
Type | Name | READ | WRITE | Options
bool | checked | isChecked | setChecked
bool | tristate | isTristate | setTristate

DESCRIPTION
The QCheckBox widget provides a check box with a text label.

QCheckBox and QRadioButton are both option buttons. That is, they can be switched on (checked) or off (unchecked). The classes differ in how the choices for the user are restricted. Radio buttons define a "one of many" choice, while check-boxes provide "many of many" choices.

While it is technically possible to implement radio-behaviour with check boxes and vice versa, it's strongly recommended to stick with the well-known semantics. Otherwise your users would be pretty confused.

Use QButtonGroup to group check-buttons visually.

Whenver a check box is checked or cleared, it emits the signal toggled(). Connect to this signal if you want to trigger an action each time the box changes state. Otherwise, use isChecked() to query whether or not a particular check box is selected.

In addition to the usual checked and unchecked states, QCheckBox optionally provides a third state to indicate "no change". This is useful whenever you need to give the user the option of neither setting nor unsetting an option. If you need that third state, enable it with setTristate() and use state() to query the current toggle state. When a tristate box changes state, it emits the stateChanged() signal.

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See also QButton, QRadioButton and Fowler: Check Box.

Examples: xform/xform.cpp i18n/main.cpp

MEMBER FUNCTION DOCUMENTATION

QCheckBox::QCheckBox ( QWidget * parent, const char * name=0 )
Constructs a check box with no text.

The parent and name arguments are sent to the QWidget constructor.

QCheckBox::QCheckBox ( const QString & text, QWidget * parent, const char * name=0 )
Constructs a check box with a text.

The parent and name arguments are sent to the QWidget constructor.

void QCheckBox::drawButton ( QPainter * paint ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.

Reimplemented from QButton.

void QCheckBox::drawButtonLabel ( QPainter * p ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.

Reimplemented from QButton.

bool QCheckBox::isChecked () const
Returns TRUE if the check box is checked, or FALSE if it is not checked.

See also setChecked().

Examples: xform/xform.cpp

bool QCheckBox::isTristate () const
Returns TRUE if the checkbox is a tristate checkbox. Otherwise returns FALSE.

See also setTristate().

void QCheckBox::resizeEvent ( QResizeEvent * ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.

Reimplemented from QWidget.

void QCheckBox::setChecked ( bool check )
Checks the check box if check is TRUE, or unchecks it if check is FALSE.

See also isChecked().

void QCheckBox::setNoChange ()
Sets the checkbox into the "no change" state.

See also setTristate().

void QCheckBox::setTristate ( bool y=TRUE )
Makes the check box a tristate check box if y is TRUE. A tristate check box provides an additional state NoChange.

Use tristate check boxes whenever you need to give the user the option of neither setting nor unsetting an option. A typical example is the "Italic" check box in the font dialog of a word processor when the marked text is partially Italic and partially not.

See also isTristate(), setNoChange(), stateChanged() and state().

QSize QCheckBox::sizeHint () const [virtual]
Reimplemented for internal reasons; the API is not affected.

Reimplemented from QWidget.

QSizePolicy QCheckBox::sizePolicy () const [virtual]
Reimplemented for internal reasons; the API is not affected.

Reimplemented from QWidget.

void QCheckBox::updateMask () [virtual protected]
Reimplemented for internal reasons; the API is not affected.

Reimplemented from QWidget.

SEE ALSO
http://doc.trolltech.com/qcheckbox.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
Copyright 1992-2001 Trolltech AS, http://www.trolltech.com. See the license file included in the distribution for a complete license statement.

AUTHOR
Generated automatically from the source code.

BUGS
If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html. Good bug reports make our job much simpler. Thank you.

In case of content or formattting problems with this manual page, please report them to qt-bugs@trolltech.com. Please include the name of the manual page (qcheckbox.3qt) and the Qt version (2.3.0).