PySide6.QtWidgets.QAbstractButton

class QAbstractButton

The QAbstractButton class is the abstract base class of button widgets, providing functionality common to buttons. More…

Inheritance diagram of PySide6.QtWidgets.QAbstractButton

Inherited by: QToolButton, QRadioButton, QPushButton, QCommandLinkButton, QCheckBox

Synopsis

Properties

Methods

Virtual methods

Slots

Signals

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

This class implements an abstract button. Subclasses of this class handle user actions, and specify how the button is drawn.

QAbstractButton provides support for both push buttons and checkable (toggle) buttons. Checkable buttons are implemented in the QRadioButton and QCheckBox classes. Push buttons are implemented in the QPushButton and QToolButton classes; these also provide toggle behavior if required.

Any button can display a label containing text and an icon. setText() sets the text; setIcon() sets the icon. If a button is disabled, its label is changed to give the button a “disabled” appearance.

If the button is a text button with a string containing an ampersand (’&’), QAbstractButton automatically creates a shortcut key. For example:

button = QPushButton(tr("Rock and Roll"), self)

The Alt+C shortcut is assigned to the button, i.e., when the user presses Alt+C the button will call animateClick() . See the QShortcut documentation for details. To display an actual ampersand, use ‘&&’.

You can also set a custom shortcut key using the setShortcut() function. This is useful mostly for buttons that do not have any text, and therefore can’t have any automatic shortcut.

button.setIcon(QIcon(":/images/print.png"))
button.setShortcut(tr("Alt+F7"))

All the buttons provided by Qt ( QPushButton , QToolButton , QCheckBox , and QRadioButton ) can display both text and icons .

A button can be made the default button in a dialog by means of setDefault() and setAutoDefault() .

QAbstractButton provides most of the states used for buttons:

  • isDown() indicates whether the button is pressed down.

  • isChecked() indicates whether the button is checked. Only checkable buttons can be checked and unchecked (see below).

  • isEnabled() indicates whether the button can be pressed by the user.

    Note

    As opposed to other widgets, buttons derived from QAbstractButton accept mouse and context menu events when disabled.

  • setAutoRepeat() sets whether the button will auto-repeat if the user holds it down. autoRepeatDelay and autoRepeatInterval define how auto-repetition is done.

  • setCheckable() sets whether the button is a toggle button or not.

The difference between isDown() and isChecked() is as follows. When the user clicks a toggle button to check it, the button is first pressed then released into the checked state. When the user clicks it again (to uncheck it), the button moves first to the pressed state, then to the unchecked state ( isChecked() and isDown() are both false).

QAbstractButton provides four signals:

  1. pressed() is emitted when the left mouse button is pressed while the mouse cursor is inside the button.

  2. released() is emitted when the left mouse button is released.

  3. clicked() is emitted when the button is first pressed and then released, when the shortcut key is typed, or when click() or animateClick() is called.

  4. toggled() is emitted when the state of a toggle button changes.

To subclass QAbstractButton , you must reimplement at least paintEvent() to draw the button’s outline and its text or pixmap. It is generally advisable to reimplement sizeHint() as well, and sometimes hitButton() (to determine whether a button press is within the button). For buttons with more than two states (like tri-state buttons), you will also have to reimplement checkStateSet() and nextCheckState() .

See also

QButtonGroup

Note

Properties can be used directly when from __feature__ import true_property is used or via accessor functions otherwise.

property autoExclusiveᅟ: bool

This property holds whether auto-exclusivity is enabled.

If auto-exclusivity is enabled, checkable buttons that belong to the same parent widget behave as if they were part of the same exclusive button group. In an exclusive button group, only one button can be checked at any time; checking another button automatically unchecks the previously checked one.

The property has no effect on buttons that belong to a button group.

autoExclusive is off by default, except for radio buttons.

See also

QRadioButton

Access functions:
property autoRepeatᅟ: bool

This property holds whether autoRepeat is enabled.

If autoRepeat is enabled, then the pressed() , released() , and clicked() signals are emitted at regular intervals when the button is down. autoRepeat is off by default. The initial delay and the repetition interval are defined in milliseconds by autoRepeatDelay and autoRepeatInterval .

Note: If a button is pressed down by a shortcut key, then auto-repeat is enabled and timed by the system and not by this class. The pressed() , released() , and clicked() signals will be emitted like in the normal case.

Access functions:
property autoRepeatDelayᅟ: int

This property holds the initial delay of auto-repetition.

If autoRepeat is enabled, then autoRepeatDelay defines the initial delay in milliseconds before auto-repetition kicks in.

Access functions:
property autoRepeatIntervalᅟ: int

This property holds the interval of auto-repetition.

If autoRepeat is enabled, then autoRepeatInterval defines the length of the auto-repetition interval in millisecons.

Access functions:
property checkableᅟ: bool

This property holds whether the button is checkable.

By default, the button is not checkable.

See also

checked

Access functions:
property checkedᅟ: bool

This property holds whether the button is checked.

Only checkable buttons can be checked. By default, the button is unchecked.

See also

checkable

Access functions:
property downᅟ: bool

This property holds whether the button is pressed down.

If this property is true, the button is pressed down. The signals pressed() and clicked() are not emitted if you set this property to true. The default is false.

Access functions:
property iconᅟ: QIcon

This property holds the icon shown on the button.

The icon’s default size is defined by the GUI style, but can be adjusted by setting the iconSize property.

Access functions:
property iconSizeᅟ: QSize

This property holds the icon size used for this button..

The default size is defined by the GUI style. This is a maximum size for the icons. Smaller icons will not be scaled up.

Access functions:
property shortcutᅟ: QKeySequence

This property holds the mnemonic associated with the button.

Access functions:
property textᅟ: str

This property holds the text shown on the button.

If the button has no text, the text() function will return an empty string.

If the text contains an ampersand character (’&’), a shortcut is automatically created for it. The character that follows the ‘&’ will be used as the shortcut key. Any previous shortcut will be overwritten or cleared if no shortcut is defined by the text. See the QShortcut documentation for details. To display an actual ampersand, use ‘&&’.

There is no default text.

Access functions:
__init__([parent=None])
Parameters:

parent – QWidget

Constructs an abstract button with a parent.

animateClick()

Performs an animated click: the button is pressed immediately, and released 100ms later.

Calling this function again before the button is released resets the release timer.

All signals associated with a click are emitted as appropriate.

This function does nothing if the button is setEnabled()

See also

click()

autoExclusive()
Return type:

bool

See also

setAutoExclusive()

Getter of property autoExclusiveᅟ .

autoRepeat()
Return type:

bool

See also

setAutoRepeat()

Getter of property autoRepeatᅟ .

autoRepeatDelay()
Return type:

int

See also

setAutoRepeatDelay()

Getter of property autoRepeatDelayᅟ .

autoRepeatInterval()
Return type:

int

See also

setAutoRepeatInterval()

Getter of property autoRepeatIntervalᅟ .

checkStateSet()

This virtual handler is called when setChecked() is used, unless it is called from within nextCheckState() . It allows subclasses to reset their intermediate button states.

See also

nextCheckState()

click()

Performs a click.

All the usual signals associated with a click are emitted as appropriate. If the button is checkable, the state of the button is toggled.

This function does nothing if the button is setEnabled()

See also

animateClick()

clicked([checked=false])
Parameters:

checked – bool

This signal is emitted when the button is activated (i.e., pressed down then released while the mouse cursor is inside the button), when the shortcut key is typed, or when click() or animateClick() is called. Notably, this signal is not emitted if you call setDown() , setChecked() or toggle() .

If the button is checkable, checked is true if the button is checked, or false if the button is unchecked.

group()
Return type:

QButtonGroup

Returns the group that this button belongs to.

If the button is not a member of any QButtonGroup , this function returns None.

See also

QButtonGroup

hitButton(pos)
Parameters:

pos – QPoint

Return type:

bool

Returns true if pos is inside the clickable button rectangle; otherwise returns false.

By default, the clickable area is the entire widget. Subclasses may reimplement this function to provide support for clickable areas of different shapes and sizes.

icon()
Return type:

QIcon

See also

setIcon()

Getter of property iconᅟ .

iconSize()
Return type:

QSize

See also

setIconSize()

Getter of property iconSizeᅟ .

isCheckable()
Return type:

bool

Getter of property checkableᅟ .

isChecked()
Return type:

bool

Getter of property checkedᅟ .

isDown()
Return type:

bool

Getter of property downᅟ .

nextCheckState()

This virtual handler is called when a button is clicked. The default implementation calls setChecked (! isChecked() ) if the button isCheckable() . It allows subclasses to implement intermediate button states.

See also

checkStateSet()

pressed()

This signal is emitted when the button is pressed down.

released()

This signal is emitted when the button is released.

setAutoExclusive(arg__1)
Parameters:

arg__1 – bool

See also

autoExclusive()

Setter of property autoExclusiveᅟ .

setAutoRepeat(arg__1)
Parameters:

arg__1 – bool

See also

autoRepeat()

Setter of property autoRepeatᅟ .

setAutoRepeatDelay(arg__1)
Parameters:

arg__1 – int

See also

autoRepeatDelay()

Setter of property autoRepeatDelayᅟ .

setAutoRepeatInterval(arg__1)
Parameters:

arg__1 – int

See also

autoRepeatInterval()

Setter of property autoRepeatIntervalᅟ .

setCheckable(arg__1)
Parameters:

arg__1 – bool

See also

isCheckable()

Setter of property checkableᅟ .

setChecked(arg__1)
Parameters:

arg__1 – bool

See also

isChecked()

Setter of property checkedᅟ .

setDown(arg__1)
Parameters:

arg__1 – bool

See also

isDown()

Setter of property downᅟ .

setIcon(icon)
Parameters:

icon – QIcon

See also

icon()

Setter of property iconᅟ .

setIconSize(size)
Parameters:

size – QSize

See also

iconSize()

Setter of property iconSizeᅟ .

setShortcut(key)
Parameters:

key – Key

setShortcut(key)
Parameters:

key – QKeySequence

See also

shortcut()

Setter of property shortcutᅟ .

setText(text)
Parameters:

text – str

See also

text()

Setter of property textᅟ .

shortcut()
Return type:

QKeySequence

See also

setShortcut()

Getter of property shortcutᅟ .

text()
Return type:

str

See also

setText()

Getter of property textᅟ .

toggle()

Toggles the state of a checkable button.

See also

checked

toggled(checked)
Parameters:

checked – bool

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

This signal is emitted whenever a checkable button changes its state. checked is true if the button is checked, or false if the button is unchecked.

This may be the result of a user action, click() slot activation, or because setChecked() is called.

The states of buttons in exclusive button groups are updated before this signal is emitted. This means that slots can act on either the “off” signal or the “on” signal emitted by the buttons in the group whose states have changed.

For example, a slot that reacts to signals emitted by newly checked buttons but which ignores signals from buttons that have been unchecked can be implemented using the following pattern:

def reactToToggle(self, checked):

   if checked:
      # Examine the new button states.
      ...

Button groups can be created using the QButtonGroup class, and updates to the button states monitored with the buttonClicked() signal.

See also

checked clicked()

Notification signal of property checkedᅟ .