QStyleOptionViewItem class is used to describe the parameters used to draw an item in a view widget. 更多...
| 头： | #include <QStyleOptionViewItem> |
| qmake: | QT += widgets |
| 继承： | QStyleOption |
| enum | Position { Left, Right, Top, Bottom } |
| enum | StyleOptionType { Type } |
| enum | StyleOptionVersion { Version } |
| enum | ViewItemFeature { None, WrapText, Alternate, HasCheckIndicator, HasDisplay, HasDecoration } |
| flags | ViewItemFeatures |
| enum | ViewItemPosition { Invalid, Beginning, Middle, End, OnlyOne } |
| QStyleOptionViewItem () | |
| QStyleOptionViewItem (const QStyleOptionViewItem & other ) |
| QBrush | backgroundBrush |
| Qt::CheckState | checkState |
| Qt::Alignment | decorationAlignment |
| Position | decorationPosition |
| QSize | decorationSize |
| Qt::Alignment | displayAlignment |
| ViewItemFeatures | features |
| QFont | font |
| QIcon | icon |
| QModelIndex | index |
| bool | showDecorationSelected |
| QString | text |
| Qt::TextElideMode | textElideMode |
| ViewItemPosition | viewItemPosition |
QStyleOptionViewItem class is used to describe the parameters used to draw an item in a view widget.
QStyleOptionViewItem contains all the information that QStyle functions need to draw the items for Qt's model/view classes.
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.
对于可以如何使用样式选项的演示范例，见 样式 范例。
另请参阅 QStyleOption and 模型/视图编程 .
This enum describes the position of the item's decoration.
| 常量 | 值 | 描述 |
|---|---|---|
QStyleOptionViewItem::Left
|
0
|
On the left of the text. |
QStyleOptionViewItem::Right
|
1
|
On the right of the text. |
QStyleOptionViewItem::Top
|
2
|
Above the text. |
QStyleOptionViewItem::Bottom
|
3
|
Below the text. |
另请参阅 decorationPosition .
This enum is used to hold information about the type of the style option, and is defined for each QStyleOption 子类。
| 常量 | 值 | 描述 |
|---|---|---|
QStyleOptionViewItem::Type
|
SO_ViewItem
|
提供样式选项的类型 ( SO_ViewItem 对于此类)。 |
类型内部使用通过 QStyleOption ，其子类，和 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.
另请参阅 StyleOptionVersion .
This enum is used to hold information about the version of the style option, and is defined for each QStyleOption 子类。
| 常量 | 值 | 描述 |
|---|---|---|
QStyleOptionViewItem::Version
|
4
|
4 |
版本的使用通过 QStyleOption 子类以实现扩展在不破坏兼容性的情况下。若使用 qstyleoption_cast (), you normally do not need to check it.
另请参阅 StyleOptionType .
This enum describes the different types of features an item can have.
| 常量 | 值 | 描述 |
|---|---|---|
QStyleOptionViewItem::None
|
0x00
|
Indicates a normal item. |
QStyleOptionViewItem::WrapText
|
0x01
|
Indicates an item with wrapped text. |
QStyleOptionViewItem::Alternate
|
0x02
|
Indicates that the item's background is rendered using alternateBase. |
QStyleOptionViewItem::HasCheckIndicator
|
0x04
|
Indicates that the item has a check state indicator. |
QStyleOptionViewItem::HasDisplay
|
0x08
|
Indicates that the item has a display role. |
QStyleOptionViewItem::HasDecoration
|
0x10
|
Indicates that the item has a decoration role. |
The ViewItemFeatures type is a typedef for QFlags <ViewItemFeature>. It stores an OR combination of ViewItemFeature values.
This enum is used to represent the placement of the item on a row. This can be used to draw items differently depending on their placement, for example by putting rounded edges at the beginning and end, and straight edges in between.
| 常量 | 值 | 描述 |
|---|---|---|
QStyleOptionViewItem::Invalid
|
0
|
The ViewItemPosition is unknown and should be disregarded. |
QStyleOptionViewItem::Beginning
|
1
|
The item appears at the beginning of the row. |
QStyleOptionViewItem::Middle
|
2
|
The item appears in the middle of the row. |
QStyleOptionViewItem::End
|
3
|
The item appears at the end of the row. |
QStyleOptionViewItem::OnlyOne
|
4
|
The item is the only one on the row, and is therefore both at the beginning and the end. |
构造 QStyleOptionViewItem , initializing the members variables to their default values.
构造副本为 other 样式选项。
QBrush that should be used to paint the view items background.
If this view item is checkable, i.e., ViewItemFeature::HasCheckIndicator is true,
checkState
is true if the item is checked; otherwise, it is false.
This variable holds the alignment of the decoration for the item
默认值为 Qt::AlignLeft .
This variable holds the position of the decoration for the item
默认值为 Left .
另请参阅 Position .
This variable holds the size of the decoration for the item
默认值为 QSize (-1, -1)，即：无效尺寸。
另请参阅 decorationAlignment and decorationPosition .
This variable holds the alignment of the display value for the item
默认值为 Qt::AlignLeft .
This variable holds a bitwise OR of the features that describe this view item
另请参阅 ViewItemFeature .
This variable holds the font used for the item
By default, the application's default font is used.
另请参阅 QFont .
The icon (if any) to be drawn in the view item.
The model index that is to be drawn.
This variable holds whether the decoration should be highlighted on selected items
If this option is true, the branch and any decorations on selected items should be highlighted, indicating that the item is selected; otherwise, no highlighting is required. The default value is false.
另请参阅 QStyle::SH_ItemView_ShowDecorationSelected and QAbstractItemView .
The text (if any) to be drawn in the view item.
where ellipsis should be added for text that is too long to fit into an item
默认值为 Qt::ElideMiddle , i.e. the ellipsis appears in the middle of the text.
另请参阅 Qt::TextElideMode and QStyle::SH_ItemView_EllipsisLocation .
Gives the position of this view item relative to other items. See the ViewItemPosition enum for the details.
