QSpacerItem Class
The QSpacerItem class provides blank space in a layout. More...
Header: | #include <QSpacerItem> |
qmake: | QT += widgets |
Inherits: | QLayoutItem |
Public Functions
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 |
Reimplemented Public Functions
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 public functions inherited from QLayoutItem
Detailed Description
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:
Class | Functions |
---|---|
QHBoxLayout | addSpacing(), addStretch(), insertSpacing(), insertStretch() |
QGridLayout | setRowMinimumHeight(), setRowStretch(), setColumnMinimumWidth(), setColumnStretch() |
See also QLayout, QWidgetItem, and QLayoutItem::spacerItem().
Member Function Documentation
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.
See also QSpacerItem::invalidate().
[override virtual]
Qt::Orientations QSpacerItem::expandingDirections() const
Reimplemented from QLayoutItem::expandingDirections().
[override virtual]
QRect QSpacerItem::geometry() const
Reimplemented from QLayoutItem::geometry().
See also setGeometry().
[override virtual]
bool QSpacerItem::isEmpty() const
Reimplemented from QLayoutItem::isEmpty().
Returns true
.
[override virtual]
QSize QSpacerItem::maximumSize() const
Reimplemented from QLayoutItem::maximumSize().
[override virtual]
QSize QSpacerItem::minimumSize() const
Reimplemented from QLayoutItem::minimumSize().
[override virtual]
void QSpacerItem::setGeometry(const QRect &r)
Reimplemented from QLayoutItem::setGeometry().
See also geometry().
[override virtual]
QSize QSpacerItem::sizeHint() const
Reimplemented from 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()
Reimplemented from QLayoutItem::spacerItem().
Returns a pointer to this object.
© The Qt Company Ltd
Licensed under the GNU Free Documentation License, Version 1.3.
https://doc.qt.io/qt-5.9/qspaceritem.html