QStyleHintReturn 類

QStyleHintReturn 類提供返迴比基本數據類型更多的樣式提示。更多...

頭：	#include <QStyleHintReturn>
qmake:	QT += widgets
繼承者：	QStyleHintReturnMask and QStyleHintReturnVariant

所有成員列錶，包括繼承成員

公共類型

enum	HintReturnType { SH_Default, SH_Mask, SH_Variant }
enum	StyleOptionType { Type }
enum	StyleOptionVersion { Version }

公共函數

QStyleHintReturn (int version = QStyleOption::Version, int type = SH_Default)

公共變量

int	type
int	version

T	qstyleoption_cast (const QStyleHintReturn * hint )
T	qstyleoption_cast (QStyleHintReturn * hint )

詳細描述

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.

成員類型文檔編製

enum QStyleHintReturn:: HintReturnType

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

enum QStyleHintReturn:: StyleOptionType

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

常量	值	描述
`QStyleHintReturn::Type`	`SH_Default`	提供樣式選項的類型 ( SH_Default 對於此類)。

類型內部使用通過 QStyleHintReturn ，其子類，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.

另請參閱 StyleOptionVersion .

enum QStyleHintReturn:: StyleOptionVersion

This enum is used to hold information about the version of the style option, and is defined for each QStyleHintReturn 子類。

常量	值	描述
`QStyleHintReturn::Version`	`1`	1

版本的使用通過 QStyleHintReturn 子類以實現擴展在不破壞兼容性的情況下。若使用 qstyleoption_cast ()，通常不需要校驗它。

另請參閱 StyleOptionType .

成員函數文檔編製

QStyleHintReturn:: QStyleHintReturn ( int version = QStyleOption::Version, int type = SH_Default)

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.

另請參閱 QStyleOption::version and QStyleOption::type .

成員變量文檔編製

int QStyleHintReturn:: type

This variable holds the type of the style hint container

另請參閱 HintReturnType .

int QStyleHintReturn:: version

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.

相關非成員

template <typename T> T qstyleoption_cast (const QStyleHintReturn * hint )

返迴 T 或 nullptr 從屬 type and version of hint .

範例：

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) {
            ...
        }
    }
    ...
}

另請參閱 QStyleHintReturn::type and QStyleHintReturn::version .

template <typename T> T qstyleoption_cast ( QStyleHintReturn * hint )

這是重載函數。

返迴 T 或 nullptr 從屬類型對於 hint .