The QGraphicsGridLayout class provides a grid layout for managing widgets in Graphics View. 更多...
| 头： | #include <QGraphicsGridLayout> |
| qmake: | QT += widgets |
| Since: | Qt 4.4 |
| 继承： | QGraphicsLayout |
| QGraphicsGridLayout (QGraphicsLayoutItem * parent = nullptr) | |
| virtual | ~QGraphicsGridLayout () |
| void | addItem (QGraphicsLayoutItem * item , int row , int column , int rowSpan , int columnSpan , Qt::Alignment alignment = Qt::Alignment()) |
| void | addItem (QGraphicsLayoutItem * item , int row , int column , Qt::Alignment alignment = Qt::Alignment()) |
| Qt::Alignment | alignment (QGraphicsLayoutItem * item ) const |
| Qt::Alignment | columnAlignment (int column ) const |
| int | columnCount () const |
| qreal | columnMaximumWidth (int column ) const |
| qreal | columnMinimumWidth (int column ) const |
| qreal | columnPreferredWidth (int column ) const |
| qreal | columnSpacing (int column ) const |
| int | columnStretchFactor (int column ) const |
| qreal | horizontalSpacing () const |
| QGraphicsLayoutItem * | itemAt (int row , int column ) const |
| void | removeItem (QGraphicsLayoutItem * item ) |
| Qt::Alignment | rowAlignment (int row ) const |
| int | rowCount () const |
| qreal | rowMaximumHeight (int row ) const |
| qreal | rowMinimumHeight (int row ) const |
| qreal | rowPreferredHeight (int row ) const |
| qreal | rowSpacing (int row ) const |
| int | rowStretchFactor (int row ) const |
| void | setAlignment (QGraphicsLayoutItem * item , Qt::Alignment alignment ) |
| void | setColumnAlignment (int column , Qt::Alignment alignment ) |
| void | setColumnFixedWidth (int column , qreal width ) |
| void | setColumnMaximumWidth (int column , qreal width ) |
| void | setColumnMinimumWidth (int column , qreal width ) |
| void | setColumnPreferredWidth (int column , qreal width ) |
| void | setColumnSpacing (int column , qreal spacing ) |
| void | setColumnStretchFactor (int column , int stretch ) |
| void | setHorizontalSpacing (qreal spacing ) |
| void | setRowAlignment (int row , Qt::Alignment alignment ) |
| void | setRowFixedHeight (int row , qreal height ) |
| void | setRowMaximumHeight (int row , qreal height ) |
| void | setRowMinimumHeight (int row , qreal height ) |
| void | setRowPreferredHeight (int row , qreal height ) |
| void | setRowSpacing (int row , qreal spacing ) |
| void | setRowStretchFactor (int row , int stretch ) |
| void | setSpacing (qreal spacing ) |
| void | setVerticalSpacing (qreal spacing ) |
| qreal | verticalSpacing () const |
| virtual int | count () const override |
| virtual void | invalidate () override |
| virtual QGraphicsLayoutItem * | itemAt (int index ) const override |
| virtual void | removeAt (int index ) override |
| virtual void | setGeometry (const QRectF & rect ) override |
| virtual QSizeF | sizeHint (Qt::SizeHint which , const QSizeF & constraint = QSizeF()) const override |
The QGraphicsGridLayout class provides a grid layout for managing widgets in Graphics View.
最常见方式是使用 QGraphicsGridLayout is to construct an object on the heap with no parent, add widgets and layouts by calling addItem (), and finally assign the layout to a widget by calling QGraphicsWidget::setLayout (). QGraphicsGridLayout automatically computes the dimensions of the grid as you add items.
QGraphicsScene scene; QGraphicsWidget *textEdit = scene.addWidget(new QTextEdit); QGraphicsWidget *pushButton = scene.addWidget(new QPushButton); QGraphicsGridLayout *layout = new QGraphicsGridLayout; layout->addItem(textEdit, 0, 0); layout->addItem(pushButton, 0, 1); QGraphicsWidget *form = new QGraphicsWidget; form->setLayout(layout); scene.addItem(form);
The layout takes ownership of the items. In some cases when the layout item also inherits from QGraphicsItem (譬如 QGraphicsWidget ) there will be a ambiguity in ownership because the layout item belongs to two ownership hierarchies. See the documentation of QGraphicsLayoutItem::setOwnedByLayout () how to handle this. You can access each item in the layout by calling count () 和 itemAt ()。调用 removeAt () will remove an item from the layout, without destroying it.
QGraphicsGridLayout respects each item's size hints and size policies, and when a cell in the grid has more space than the items can fill, each item is arranged according to the layout's alignment for that item. You can set an alignment for each item by calling setAlignment (), and check the alignment for any item by calling alignment (). You can also set the alignment for an entire row or column by calling setRowAlignment () 和 setColumnAlignment () respectively. By default, items are aligned to the top left.
另请参阅 QGraphicsLinearLayout and QGraphicsWidget .
构造 QGraphicsGridLayout 实例。 parent 会被传递给 QGraphicsLayout 的构造函数。
[虚拟]
QGraphicsGridLayout::
~QGraphicsGridLayout
()
销毁 QGraphicsGridLayout 对象。
添加 item to the grid on row and column . You can specify a rowSpan and columnSpan and an optional alignment .
添加 item to the grid on row and column . You can specify an optional alignment for item .
返回对齐方式为 item .
另请参阅 setAlignment ().
返回对齐方式为 column .
另请参阅 setColumnAlignment ().
Returns the number of columns in the grid layout. This is always one more than the index of the last column that is occupied by a layout item (empty columns are counted except for those at the end).
返回最大宽度为 column .
另请参阅 setColumnMaximumWidth ().
Returns the minimum width for column .
另请参阅 setColumnMinimumWidth ().
Returns the preferred width for column .
另请参阅 setColumnPreferredWidth ().
Returns the column spacing for column .
另请参阅 setColumnSpacing ().
Returns the stretch factor for column .
另请参阅 setColumnStretchFactor ().
[override virtual]
int
QGraphicsGridLayout::
count
() const
重实现自 QGraphicsLayout::count ().
Returns the number of layout items in this grid layout.
Returns the default horizontal spacing for the grid layout.
另请参阅 setHorizontalSpacing ().
[override virtual]
void
QGraphicsGridLayout::
invalidate
()
重实现自 QGraphicsLayout::invalidate ().
Returns a pointer to the layout item at ( row , column ).
[override virtual]
QGraphicsLayoutItem
*QGraphicsGridLayout::
itemAt
(
int
index
) const
重实现自 QGraphicsLayout::itemAt ().
Returns the layout item at index , or 0 if there is no layout item at this index.
[override virtual]
void
QGraphicsGridLayout::
removeAt
(
int
index
)
重实现自 QGraphicsLayout::removeAt ().
移除布局项在 index without destroying it. Ownership of the item is transferred to the caller.
另请参阅 addItem ().
移除布局项 item without destroying it. Ownership of the item is transferred to the caller.
另请参阅 addItem ().
Returns the alignment of row .
另请参阅 setRowAlignment ().
Returns the number of rows in the grid layout. This is always one more than the index of the last row that is occupied by a layout item (empty rows are counted except for those at the end).
Returns the maximum height for row, row .
另请参阅 setRowMaximumHeight ().
Returns the minimum height for row, row .
另请参阅 setRowMinimumHeight ().
Returns the preferred height for row, row .
另请参阅 setRowPreferredHeight ().
Returns the row spacing for row .
另请参阅 setRowSpacing ().
Returns the stretch factor for row .
另请参阅 setRowStretchFactor ().
Sets the alignment for item to alignment .
另请参阅 alignment ().
Sets the alignment for column to alignment .
另请参阅 columnAlignment ().
Sets the fixed width of column to width .
Sets the maximum width of column to width .
另请参阅 columnMaximumWidth ().
Sets the minimum width for column to width .
另请参阅 columnMinimumWidth ().
Sets the preferred width for column to width .
另请参阅 columnPreferredWidth ().
Sets the spacing for column to spacing .
另请参阅 columnSpacing ().
设置拉伸因子为 column to stretch .
另请参阅 columnStretchFactor ().
[override virtual]
void
QGraphicsGridLayout::
setGeometry
(const
QRectF
&
rect
)
重实现自 QGraphicsLayoutItem::setGeometry ().
Sets the bounding geometry of the grid layout to rect .
Sets the default horizontal spacing for the grid layout to spacing .
另请参阅 horizontalSpacing ().
Sets the alignment of row to alignment .
另请参阅 rowAlignment ().
Sets the fixed height for row, row ，到 height .
Sets the maximum height for row, row ，到 height .
另请参阅 rowMaximumHeight ().
Sets the minimum height for row, row ，到 height .
另请参阅 rowMinimumHeight ().
Sets the preferred height for row, row ，到 height .
另请参阅 rowPreferredHeight ().
Sets the spacing for row to spacing .
另请参阅 rowSpacing ().
设置拉伸因子为 row to stretch .
另请参阅 rowStretchFactor ().
Sets the grid layout's default spacing, both vertical and horizontal, to spacing .
另请参阅 rowSpacing () 和 columnSpacing ().
Sets the default vertical spacing for the grid layout to spacing .
另请参阅 verticalSpacing ().
[override virtual]
QSizeF
QGraphicsGridLayout::
sizeHint
(
Qt::SizeHint
which
, const
QSizeF
&
constraint
= QSizeF()) const
重实现自 QGraphicsLayoutItem::sizeHint ().
Returns the default vertical spacing for the grid layout.
另请参阅 setVerticalSpacing ().