QStyleOptionComboBox Class
The QStyleOptionComboBox class is used to describe the parameter for drawing a combobox. 更多...
| 头文件: | #include <QStyleOptionComboBox> |
| qmake: | QT += widgets |
| 基类: | QStyleOptionComplex |
公有类型
| enum | StyleOptionType { Type } |
| enum | StyleOptionVersion { Version } |
公有函数
| QStyleOptionComboBox() | |
| QStyleOptionComboBox(const QStyleOptionComboBox &other) |
- 2 个公有函数继承自 QStyleOption
公有变量
| QIcon | currentIcon |
| QString | currentText |
| bool | editable |
| bool | frame |
| QSize | iconSize |
| QRect | popupRect |
- 2 个公有变量继承自 QStyleOptionComplex
- 8 个公有变量继承自 QStyleOption
详细描述
The QStyleOptionComboBox class is used to describe the parameter for drawing a combobox.
QStyleOptionButton contains all the information that QStyle functions need to draw QComboBox.
For performance reasons, the access to the member variables is direct (i.e., using the . or -> operator). This low-level feel makes the structures straightforward to use and emphasizes that these are simply parameters used by the style functions.
For an example demonstrating how style options can be used, see the Styles example.
参见 QStyleOption, QStyleOptionComplex, and QComboBox.
成员类型
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.
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 | 1 |
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.
参见 StyleOptionType.
成员函数
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.
成员变量
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
参见 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.