QCheckBox ¶

概要 ¶

详细描述 ¶

A QCheckBox is an option button that can be switched on (checked) or off (unchecked). Checkboxes are typically used to represent features in an application that can be enabled or disabled without affecting others. Different types of behavior can be implemented. For example, a QButtonGroup can be used to group check buttons logically, allowing exclusive checkboxes. However, QButtonGroup does not provide any visual representation.

The image below further illustrates the differences between exclusive and non-exclusive checkboxes.

Whenever a checkbox is checked or cleared, it emits the signal stateChanged() . Connect to this signal if you want to trigger an action each time the checkbox changes state. You can use isChecked() to query whether or not a checkbox is checked.

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 checking nor unchecking a checkbox. If you need this third state, enable it with setTristate() , and use checkState() to query the current toggle state.

就像 QPushButton , a checkbox displays text, and optionally a small icon. The icon is set with setIcon() . The text can be set in the constructor or with setText() . A shortcut key can be specified by preceding the preferred character with an ampersand. For example:

checkbox = QCheckBox("C&ase sensitive", self)
											

In this example, the shortcut is Alt+A 。见 QShortcut documentation for details. To display an actual ampersand, use ‘&&’.

重要继承函数： text() , setText() , text() , pixmap(), setPixmap(), accel(), setAccel(), isToggleButton(), setDown() , isDown() , isOn(), checkState() , autoRepeat() , isExclusiveToggle(), group() , setAutoRepeat() , toggle() , pressed() , released() , clicked() , toggled() , checkState() ，和 stateChanged() .

另请参阅

QAbstractButton QRadioButton GUI Design Handbook: Check Box

class QCheckBox ( [ parent=None ] ) ¶

QCheckBox(text[, parent=None])

param parent

QWidget

param text

unicode

Constructs a checkbox with the given parent , but with no text.

parent 被传递给 QAbstractButton 构造函数。

Constructs a checkbox with the given parent and text .

parent 被传递给 QAbstractButton 构造函数。

PySide2.QtWidgets.QCheckBox. checkState ( ) ¶

返回类型

CheckState

Returns the checkbox’s check state. If you do not need tristate support, you can also use isChecked() , which returns a boolean.

另请参阅

setCheckState() CheckState

PySide2.QtWidgets.QCheckBox. initStyleOption ( option ) ¶

参数

option – QStyleOptionButton

初始化 option 采用值来自此 QCheckBox . This method is useful for subclasses that require a QStyleOptionButton , but do not want to fill in all the information themselves.

另请参阅

initFrom()

PySide2.QtWidgets.QCheckBox. isTristate ( ) ¶

返回类型

bool

PySide2.QtWidgets.QCheckBox. setCheckState ( state ) ¶

参数

state – CheckState

Sets the checkbox’s check state to state . If you do not need tristate support, you can also use setChecked() , which takes a boolean.

另请参阅

checkState() CheckState

PySide2.QtWidgets.QCheckBox. setTristate ( [ y=true ] ) ¶

参数

y – bool

另请参阅

isTristate()

PySide2.QtWidgets.QCheckBox. stateChanged ( arg__1 ) ¶

参数

arg__1 – int