- Qt 6.12
- Qt Widgets
- C++ Classes
- QStyleOptionComboBox
- Qt 6.12.0 Reference Documentation

# QStyleOptionComboBox Class

The QStyleOptionComboBox class is used to describe the parameter for drawing a combobox. More...

Header: | `#include <QStyleOptionComboBox>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Widgets)` `target_link_libraries(mytarget PRIVATE Qt6::Widgets)`
qmake: | `QT += widgets`
Inherits: | QStyleOptionComplex

- List of all members, including inherited members

## Public Types

enum | StyleOptionType { Type }
enum | StyleOptionVersion { Version }

## Public Functions

| QStyleOptionComboBox()
| QStyleOptionComboBox(const QStyleOptionComboBox &other)
QStyleOptionComboBox & | operator=(const QStyleOptionComboBox &)

## Public Variables

QIcon | currentIcon
QString | currentText
bool | editable
bool | frame
QSize | iconSize
QRect | popupRect
Qt::Alignment | textAlignment

## Detailed Description

QStyleOptionButton contains all the information that QStyle functions need to draw QComboBox.

For performance reasons, there are few member functions and the access to the member variables is direct (i.e., using the `.` or `->` operator). This makes the structures straightforward to use and emphasizes that these are simply parameters used by the style functions.

See also QStyleOption, QStyleOptionComplex, and QComboBox.

## Member Type Documentation

### enum QStyleOptionComboBox::StyleOptionType

This enum is used to hold information about the type of the style option, and is defined for each QStyleOption subclass.

Constant | Value | Description
--- | --- | ---
`QStyleOptionComboBox::Type` | `SO_ComboBox` | The type of style option provided (SO_ComboBox for this class).

The type is used internally by QStyleOption, its subclasses, and qstyleoption_cast() to determine the type of style option. In general you do not need to worry about this unless you want to create your own QStyleOption subclass and your own styles.

See also StyleOptionVersion.

### enum QStyleOptionComboBox::StyleOptionVersion

This enum is used to hold information about the version of the style option, and is defined for each QStyleOption subclass.

Constant | Value | Description
--- | --- | ---
`QStyleOptionComboBox::Version` | `1` | 2

The version is used by QStyleOption subclasses to implement extensions without breaking compatibility. If you use qstyleoption_cast(), you normally do not need to check it.

See also StyleOptionType.

## Member Function Documentation

### QStyleOptionComboBox::QStyleOptionComboBox()

Creates a QStyleOptionComboBox, initializing the members variables to their default values.

### QStyleOptionComboBox::QStyleOptionComboBox(const QStyleOptionComboBox &other)

Constructs a copy of the other style option.

### `[noexcept default]` QStyleOptionComboBox &QStyleOptionComboBox::operator=(const QStyleOptionComboBox &)

Copy-assigns other to this QStyleOptionComboBox instance.

## Member Variable Documentation

### QIcon QStyleOptionComboBox::currentIcon

This variable holds the icon for the current item of the combo box

The default value is an empty icon, i.e. an icon with neither a pixmap nor a filename.

### QString QStyleOptionComboBox::currentText

This variable holds the text for the current item of the combo box

The default value is an empty string.

### bool QStyleOptionComboBox::editable

This variable holds whether or not the combobox is editable or not

the default value is false

See also QComboBox::isEditable().

### bool QStyleOptionComboBox::frame

This variable holds whether the combo box has a frame

The default value is true.

### QSize QStyleOptionComboBox::iconSize

This variable holds the icon size for the current item of the combo box

The default value is QSize(-1, -1), i.e. an invalid size.

### QRect QStyleOptionComboBox::popupRect

This variable holds the popup rectangle for the combobox

The default value is a null rectangle, i.e. a rectangle with both the width and the height set to 0.

This variable is currently unused. You can safely ignore it.

See also QStyle::SC_ComboBoxListBoxPopup.

### Qt::Alignment QStyleOptionComboBox::textAlignment

This variable holds the alignment of the current text in the combo box

The default value is Qt::AlignLeft | Qt::AlignVCenter.