QStyleOptionHeader Class
The QStyleOptionHeader class is used to describe the parameters for drawing a header. 更多...
| 头文件: | #include <QStyleOptionHeader> |
| qmake: | QT += widgets |
| 基类: | QStyleOption |
公有类型
| enum | SectionPosition { Beginning, Middle, End, OnlyOneSection } |
| enum | SelectedPosition { NotAdjacent, NextIsSelected, PreviousIsSelected, NextAndPreviousAreSelected } |
| enum | SortIndicator { None, SortUp, SortDown } |
| enum | StyleOptionType { Type } |
| enum | StyleOptionVersion { Version } |
公有函数
| QStyleOptionHeader() | |
| QStyleOptionHeader(const QStyleOptionHeader &other) |
- 2 个公有函数继承自 QStyleOption
公有变量
| QIcon | icon |
| Qt::Alignment | iconAlignment |
| Qt::Orientation | orientation |
| SectionPosition | position |
| int | section |
| SelectedPosition | selectedPosition |
| SortIndicator | sortIndicator |
| QString | text |
| Qt::Alignment | textAlignment |
- 8 个公有变量继承自 QStyleOption
详细描述
The QStyleOptionHeader class is used to describe the parameters for drawing a header.
QStyleOptionHeader contains all the information that QStyle functions need to draw the item views' header pane, header sort arrow, and header label.
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.
成员类型
enum QStyleOptionHeader::SectionPosition
This enum lets you know where the section's position is in relation to the other sections.
| Constant | Value | Description |
|---|---|---|
QStyleOptionHeader::Beginning | 0 | At the beginining of the header |
QStyleOptionHeader::Middle | 1 | In the middle of the header |
QStyleOptionHeader::End | 2 | At the end of the header |
QStyleOptionHeader::OnlyOneSection | 3 | Only one header section |
参见 position.
enum QStyleOptionHeader::SelectedPosition
This enum lets you know where the section's position is in relation to the selected section.
| Constant | Value | Description |
|---|---|---|
QStyleOptionHeader::NotAdjacent | 0 | Not adjacent to the selected section |
QStyleOptionHeader::NextIsSelected | 1 | The next section is selected |
QStyleOptionHeader::PreviousIsSelected | 2 | The previous section is selected |
QStyleOptionHeader::NextAndPreviousAreSelected | 3 | Both the next and previous section are selected |
参见 selectedPosition.
enum QStyleOptionHeader::SortIndicator
Indicates which direction the sort indicator should be drawn
| Constant | Value | Description |
|---|---|---|
QStyleOptionHeader::None | 0 | No sort indicator is needed |
QStyleOptionHeader::SortUp | 1 | Draw an up indicator |
QStyleOptionHeader::SortDown | 2 | Draw a down indicator |
参见 sortIndicator.
enum QStyleOptionHeader::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 |
|---|---|---|
QStyleOptionHeader::Type | SO_Header | The type of style option provided (SO_Header 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 QStyleOptionHeader::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 |
|---|---|---|
QStyleOptionHeader::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
QStyleOptionHeader::QStyleOptionHeader()
Constructs a QStyleOptionHeader, initializing the members variables to their default values.
QStyleOptionHeader::QStyleOptionHeader(const QStyleOptionHeader &other)
Constructs a copy of the other style option.
成员变量
QIcon QStyleOptionHeader::icon
This variable holds the icon of the header
The default value is an empty icon, i.e. an icon with neither a pixmap nor a filename.
Qt::Alignment QStyleOptionHeader::iconAlignment
This variable holds the alignment flags for the icon of the header
The default value is Qt::AlignLeft.
Qt::Orientation QStyleOptionHeader::orientation
This variable holds the header's orientation (horizontal or vertical)
The default orientation is Qt::Horizontal
SectionPosition QStyleOptionHeader::position
This variable holds the section's position in relation to the other sections
The default value is QStyleOptionHeader::Beginning.
int QStyleOptionHeader::section
This variable holds which section of the header is being painted
The default value is 0.
SelectedPosition QStyleOptionHeader::selectedPosition
This variable holds the section's position in relation to the selected section
The default value is QStyleOptionHeader::NotAdjacent
SortIndicator QStyleOptionHeader::sortIndicator
This variable holds the direction the sort indicator should be drawn
The default value is QStyleOptionHeader::None.
QString QStyleOptionHeader::text
This variable holds the text of the header
The default value is an empty string.
Qt::Alignment QStyleOptionHeader::textAlignment
This variable holds the alignment flags for the text of the header
The default value is Qt::AlignLeft.