QStyleHintReturn 类提供返回比基本数据类型更多的样式提示。 更多...
头: | #include <QStyleHintReturn> |
qmake: | QT += widgets |
继承者: |
enum | HintReturnType { SH_Default, SH_Mask, SH_Variant } |
enum | StyleOptionType { Type } |
enum | StyleOptionVersion { Version } |
QStyleHintReturn (int version = QStyleOption::Version, int type = SH_Default) |
int | type |
int | version |
T | qstyleoption_cast (const QStyleHintReturn * hint ) |
T | qstyleoption_cast (QStyleHintReturn * hint ) |
QStyleHintReturn and its subclasses are used to pass information from a style back to the querying widget. This is most useful when the return value from QStyle::styleHint () does not provide enough detail; for example, when a mask is to be returned.
常量 | 值 | 描述 |
---|---|---|
QStyleHintReturn::SH_Default
|
0xf000
|
QStyleHintReturn |
QStyleHintReturn::SH_Mask
|
0xf001
|
QStyle::SH_RubberBand_Mask QStyle::SH_FocusFrame_Mask |
QStyleHintReturn::SH_Variant
|
0xf002
|
QStyle::SH_TextControl_FocusIndicatorTextCharFormat |
This enum is used to hold information about the type of the style option, and is defined for each QStyleHintReturn 子类。
常量 | 值 | 描述 |
---|---|---|
QStyleHintReturn::Type
|
SH_Default
|
提供样式选项的类型 ( SH_Default 对于此类)。 |
类型内部使用通过 QStyleHintReturn ,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 QStyleHintReturn 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 QStyleHintReturn 子类。
常量 | 值 | 描述 |
---|---|---|
QStyleHintReturn::Version
|
1
|
1 |
版本的使用通过 QStyleHintReturn 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 .
Constructs a QStyleHintReturn with version version and type type .
The version has no special meaning for QStyleHintReturn; it can be used by subclasses to distinguish between different version of the same hint type.
另请参阅 QStyleOption::version and QStyleOption::type .
This variable holds the type of the style hint container
另请参阅 HintReturnType .
This variable holds the version of the style hint return container
This value can be used by subclasses to implement extensions without breaking compatibility. If you use qstyleoption_cast <T>(), you normally do not need to check it.
返回 T 或
nullptr
从属
type
and
version
of
hint
.
范例:
int MyStyle::styleHint(StyleHint stylehint, const QStyleOption *opt, const QWidget *widget, QStyleHintReturn* returnData) const; { if (stylehint == SH_RubberBand_Mask) { const QStyleHintReturnMask *maskReturn = qstyleoption_cast<const QStyleHintReturnMask *>(hint); if (maskReturn) { ... } } ... }
另请参阅 QStyleHintReturn::type and QStyleHintReturn::version .
这是重载函数。
返回 T 或
nullptr
depending on the type of
hint
.