QStyleOptionViewItem 类

QStyleOptionViewItem 类是用于绘制视图 Widget 中项的描述参数。 更多...

头: #include <QStyleOptionViewItem>
qmake: QT += widgets
继承: QStyleOption

公共类型

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 }

公共函数

QStyleOptionViewItem (const QStyleOptionViewItem & other )
QStyleOptionViewItem ()

公共变量

QBrush backgroundBrush
Qt::CheckState checkState
Qt::Alignment decorationAlignment
QStyleOptionViewItem::Position decorationPosition
QSize decorationSize
Qt::Alignment displayAlignment
QStyleOptionViewItem::ViewItemFeatures features
QFont font
QIcon icon
QModelIndex index
bool showDecorationSelected
QString text
Qt::TextElideMode textElideMode
QStyleOptionViewItem::ViewItemPosition viewItemPosition

详细描述

QStyleOptionViewItem 包含所有信息当 QStyle 函数需要为 Qt 模型/视图类绘制项。

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 .

成员类型文档编制

enum QStyleOptionViewItem:: Position

This enum describes the position of the item's decoration.

常量 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 .

enum QStyleOptionViewItem:: StyleOptionType

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

常量 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 .

enum QStyleOptionViewItem:: 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 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 (),通常不需要校验它。

另请参阅 StyleOptionType .

enum QStyleOptionViewItem:: ViewItemFeature
flags QStyleOptionViewItem:: ViewItemFeatures

This enum describes the different types of features an item can have.

常量 描述
QStyleOptionViewItem::None 0x00 指示正常项。
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.

enum QStyleOptionViewItem:: ViewItemPosition

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 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.

成员函数文档编制

QStyleOptionViewItem:: QStyleOptionViewItem (const QStyleOptionViewItem & other )

构造副本为 other 样式选项。

QStyleOptionViewItem:: QStyleOptionViewItem ()

Constructs a QStyleOptionViewItem, initializing the members variables to their default values.

成员变量文档编制

QBrush QStyleOptionViewItem:: backgroundBrush

The QBrush that should be used to paint the view items background.

Qt::CheckState QStyleOptionViewItem:: checkState

If this view item is checkable, i.e., ViewItemFeature::HasCheckIndicator is true, checkState is true if the item is checked; otherwise, it is false.

Qt::Alignment QStyleOptionViewItem:: decorationAlignment

This variable holds the alignment of the decoration for the item

默认值为 Qt::AlignLeft .

QStyleOptionViewItem::Position QStyleOptionViewItem:: decorationPosition

This variable holds the position of the decoration for the item

默认值为 Left .

另请参阅 Position .

QSize QStyleOptionViewItem:: decorationSize

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 .

Qt::Alignment QStyleOptionViewItem:: displayAlignment

This variable holds the alignment of the display value for the item

默认值为 Qt::AlignLeft .

QStyleOptionViewItem::ViewItemFeatures QStyleOptionViewItem:: features

This variable holds a bitwise OR of the features that describe this view item

另请参阅 ViewItemFeature .

QFont QStyleOptionViewItem:: font

This variable holds the font used for the item

By default, the application's default font is used.

另请参阅 QFont .

QIcon QStyleOptionViewItem:: icon

视图项要绘制的图标 (若有的话)。

QModelIndex QStyleOptionViewItem:: index

要绘制的模型索引。

bool QStyleOptionViewItem:: showDecorationSelected

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 .

QString QStyleOptionViewItem:: text

The text (if any) to be drawn in the view item.

Qt::TextElideMode QStyleOptionViewItem:: textElideMode

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 .

QStyleOptionViewItem::ViewItemPosition QStyleOptionViewItem:: viewItemPosition

Gives the position of this view item relative to other items. See the ViewItemPosition enum for the details.