QSpacerItem Class
The QSpacerItem class provides blank space in a layout. 更多...
| 头文件: | #include <QSpacerItem> |
| qmake: | QT += widgets |
| 基类: | QLayoutItem |
公有函数
| QSpacerItem(int w, int h, QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum) | |
| ~QSpacerItem() | |
| void | changeSize(int w, int h, QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum) |
| QSizePolicy | sizePolicy() const |
重新实现的公有函数
| virtual Qt::Orientations | expandingDirections() const override |
| virtual QRect | geometry() const override |
| virtual bool | isEmpty() const override |
| virtual QSize | maximumSize() const override |
| virtual QSize | minimumSize() const override |
| virtual void | setGeometry(const QRect &r) override |
| virtual QSize | sizeHint() const override |
| virtual QSpacerItem * | spacerItem() override |
- 17 个公有函数继承自 QLayoutItem
详细描述
The QSpacerItem class provides blank space in a layout.
Normally, you don't need to use this class directly. Qt's built-in layout managers provide the following functions for manipulating empty space in layouts:
参见 QLayout, QWidgetItem, and QLayoutItem::spacerItem().
成员函数
QSpacerItem::QSpacerItem(int w, int h, QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)
Constructs a spacer item with preferred width w, preferred height h, horizontal size policy hPolicy and vertical size policy vPolicy.
The default values provide a gap that is able to stretch if nothing else wants the space.
QSpacerItem::~QSpacerItem()
Destructor.
void QSpacerItem::changeSize(int w, int h, QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)
Changes this spacer item to have preferred width w, preferred height h, horizontal size policy hPolicy and vertical size policy vPolicy.
The default values provide a gap that is able to stretch if nothing else wants the space.
Note that if changeSize() is called after the spacer item has been added to a layout, it is necessary to invalidate the layout in order for the spacer item's new size to take effect.
参见 QSpacerItem::invalidate().
[override virtual] Qt::Orientations QSpacerItem::expandingDirections() const
重新实现 QLayoutItem::expandingDirections().
[override virtual] QRect QSpacerItem::geometry() const
重新实现 QLayoutItem::geometry().
参见 setGeometry().
[override virtual] bool QSpacerItem::isEmpty() const
重新实现 QLayoutItem::isEmpty().
Returns true.
[override virtual] QSize QSpacerItem::maximumSize() const
重新实现 QLayoutItem::maximumSize().
[override virtual] QSize QSpacerItem::minimumSize() const
重新实现 QLayoutItem::minimumSize().
[override virtual] void QSpacerItem::setGeometry(const QRect &r)
重新实现 QLayoutItem::setGeometry().
参见 geometry().
[override virtual] QSize QSpacerItem::sizeHint() const
重新实现 QLayoutItem::sizeHint().
QSizePolicy QSpacerItem::sizePolicy() const
Returns the size policy of this item.
This function was introduced in Qt 5.5.
[override virtual] QSpacerItem *QSpacerItem::spacerItem()
重新实现 QLayoutItem::spacerItem().
Returns a pointer to this object.