The QGraphicsLinearLayout class provides a horizontal or vertical layout for managing widgets in Graphics View. More...

#include <qgraphicslinearlayout.h>

Inheritance diagram for QGraphicsLinearLayout:

Public Functions
void	addItem (QGraphicsLayoutItem *item)
	This convenience function is equivalent to calling insertItem(-1, item). More...

void	addStretch (int stretch=1)
	This convenience function is equivalent to calling insertStretch(-1, stretch). More...

Qt::Alignment	alignment (QGraphicsLayoutItem *item) const
	Returns the alignment for item. More...

int	count () const
	Reimplemented Function More...

void	dump (int indent=0) const

void	insertItem (int index, QGraphicsLayoutItem *item)
	Inserts item into the layout at index, or before any item that is currently at index. More...

void	insertStretch (int index, int stretch=1)
	Inserts a stretch of stretch at index, or before any item that is currently at index. More...

void	invalidate ()
	Reimplemented Function More...

QGraphicsLayoutItem *	itemAt (int index) const
	When iterating from 0 and up, it will return the items in the visual arranged order. More...

qreal	itemSpacing (int index) const
	Returns the spacing after item at index. More...

Qt::Orientation	orientation () const
	Returns the layout orientation. More...

	QGraphicsLinearLayout (QGraphicsLayoutItem *parent=0)
	Constructs a QGraphicsLinearLayout instance using Qt::Horizontal orientation. More...

	QGraphicsLinearLayout (Qt::Orientation orientation, QGraphicsLayoutItem *parent=0)
	Constructs a QGraphicsLinearLayout instance. More...

void	removeAt (int index)
	Removes the item at index without destroying it. More...

void	removeItem (QGraphicsLayoutItem *item)
	Removes item from the layout without destroying it. More...

void	setAlignment (QGraphicsLayoutItem *item, Qt::Alignment alignment)
	Sets the alignment of item to alignment. More...

void	setGeometry (const QRectF &rect)
	Reimplemented Function More...

void	setItemSpacing (int index, qreal spacing)
	Sets the spacing after item at index to spacing. More...

void	setOrientation (Qt::Orientation orientation)
	Change the layout orientation to orientation. More...

void	setSpacing (qreal spacing)
	Sets the layout's spacing to spacing. More...

void	setStretchFactor (QGraphicsLayoutItem *item, int stretch)
	Sets the stretch factor for item to stretch. More...

QSizeF	sizeHint (Qt::SizeHint which, const QSizeF &constraint=QSizeF()) const
	Reimplemented Function More...

qreal	spacing () const
	Returns the layout's spacing. More...

int	stretchFactor (QGraphicsLayoutItem *item) const
	Returns the stretch factor for item. More...

virtual	~QGraphicsLinearLayout ()
	Destroys the QGraphicsLinearLayout object. More...

Public Functions inherited from QGraphicsLayout
void	activate ()
	Activates the layout, causing all items in the layout to be immediately rearranged. More...

void	getContentsMargins (qreal left, qreal top, qreal right, qreal bottom) const
	Reimplemented Function More...

bool	isActivated () const
	Returns true if the layout is currently being activated; otherwise, returns false. More...

	QGraphicsLayout (QGraphicsLayoutItem *parent=0)
	Contructs a QGraphicsLayout object. More...

void	setContentsMargins (qreal left, qreal top, qreal right, qreal bottom)
	Sets the contents margins to left, top, right and bottom. More...

virtual void	updateGeometry ()
	Reimplemented Function More...

virtual void	widgetEvent (QEvent *e)
	This virtual event handler receives all events for the managed widget. More...

	~QGraphicsLayout ()
	Destroys the QGraphicsLayout object. More...

Public Functions inherited from QGraphicsLayoutItem
QRectF	contentsRect () const
	Returns the contents rect in local coordinates. More...

QSizeF	effectiveSizeHint (Qt::SizeHint which, const QSizeF &constraint=QSizeF()) const
	Returns the effective size hint for this QGraphicsLayoutItem. More...

QRectF	geometry () const
	Returns the item's geometry (e. More...

QGraphicsItem *	graphicsItem () const
	Returns the QGraphicsItem that this layout item represents. More...

bool	isLayout () const
	Returns true if this QGraphicsLayoutItem is a layout (e.g., is inherited by an object that arranges other QGraphicsLayoutItem objects); otherwise returns false. More...

qreal	maximumHeight () const
	Returns the maximum height. More...

QSizeF	maximumSize () const
	Returns the maximum size. More...

qreal	maximumWidth () const
	Returns the maximum width. More...

qreal	minimumHeight () const
	Returns the minimum height. More...

QSizeF	minimumSize () const
	Returns the minimum size. More...

qreal	minimumWidth () const
	Returns the minimum width. More...

bool	ownedByLayout () const
	Returns whether a layout should delete this item in its destructor. More...

QGraphicsLayoutItem *	parentLayoutItem () const
	Returns the parent of this QGraphicsLayoutItem, or 0 if there is no parent, or if the parent does not inherit from QGraphicsLayoutItem (QGraphicsLayoutItem is often used through multiple inheritance with QObject-derived classes). More...

qreal	preferredHeight () const
	Returns the preferred height. More...

QSizeF	preferredSize () const
	Returns the preferred size. More...

qreal	preferredWidth () const
	Returns the preferred width. More...

	QGraphicsLayoutItem (QGraphicsLayoutItem *parent=0, bool isLayout=false)
	Constructs the QGraphicsLayoutItem object. More...

void	setMaximumHeight (qreal height)
	Sets the maximum height to height. More...

void	setMaximumSize (const QSizeF &size)
	Sets the maximum size to size. More...

void	setMaximumSize (qreal w, qreal h)
	This convenience function is equivalent to calling setMaximumSize(QSizeF(w, h)). More...

void	setMaximumWidth (qreal width)
	Sets the maximum width to width. More...

void	setMinimumHeight (qreal height)
	Sets the minimum height to height. More...

void	setMinimumSize (const QSizeF &size)
	Sets the minimum size to size. More...

void	setMinimumSize (qreal w, qreal h)
	This convenience function is equivalent to calling setMinimumSize(QSizeF(w, h)). More...

void	setMinimumWidth (qreal width)
	Sets the minimum width to width. More...

void	setParentLayoutItem (QGraphicsLayoutItem *parent)
	Sets the parent of this QGraphicsLayoutItem to parent. More...

void	setPreferredHeight (qreal height)
	Sets the preferred height to height. More...

void	setPreferredSize (const QSizeF &size)
	Sets the preferred size to size. More...

void	setPreferredSize (qreal w, qreal h)
	This convenience function is equivalent to calling setPreferredSize(QSizeF(w, h)). More...

void	setPreferredWidth (qreal width)
	Sets the preferred width to width. More...

void	setSizePolicy (const QSizePolicy &policy)
	Sets the size policy to policy. More...

void	setSizePolicy (QSizePolicy::Policy hPolicy, QSizePolicy::Policy vPolicy, QSizePolicy::ControlType controlType=QSizePolicy::DefaultType)
	This function is equivalent to calling setSizePolicy(QSizePolicy(hPolicy, vPolicy, controlType)). More...

QSizePolicy	sizePolicy () const
	Returns the current size policy. More...

virtual	~QGraphicsLayoutItem ()
	Destroys the QGraphicsLayoutItem object. More...

Additional Inherited Members
Static Public Functions inherited from QGraphicsLayout
static bool	instantInvalidatePropagation ()

static void	setInstantInvalidatePropagation (bool enable)

Protected Functions inherited from QGraphicsLayout
void	addChildLayoutItem (QGraphicsLayoutItem *layoutItem)
	This function is a convenience function provided for custom layouts, and will go through all items in the layout and reparent their graphics items to the closest QGraphicsWidget ancestor of the layout. More...

	QGraphicsLayout (QGraphicsLayoutPrivate &, QGraphicsLayoutItem *)

Protected Functions inherited from QGraphicsLayoutItem
	QGraphicsLayoutItem (QGraphicsLayoutItemPrivate &dd)

void	setGraphicsItem (QGraphicsItem *item)
	If the QGraphicsLayoutItem represents a QGraphicsItem, and it wants to take advantage of the automatic reparenting capabilities of QGraphicsLayout it should set this value. More...

void	setOwnedByLayout (bool ownedByLayout)
	Sets whether a layout should delete this item in its destructor or not. More...

Protected Variables inherited from QGraphicsLayoutItem
QScopedPointer< QGraphicsLayoutItemPrivate >	d_ptr

Detailed Description

The QGraphicsLinearLayout class provides a horizontal or vertical layout for managing widgets in Graphics View.

Since: 4.4

The default orientation for a linear layout is Qt::Horizontal. You can choose a vertical orientation either by calling setOrientation(), or by passing Qt::Vertical to QGraphicsLinearLayout's constructor.

The most common way to use QGraphicsLinearLayout 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().

QGraphicsScene scene;
QGraphicsWidget *textEdit = scene.addWidget(new QTextEdit);
QGraphicsWidget *pushButton = scene.addWidget(new QPushButton);
QGraphicsLinearLayout *layout = new QGraphicsLinearLayout;
layout->addItem(textEdit);
layout->addItem(pushButton);
QGraphicsWidget *form = new QGraphicsWidget;
form->setLayout(layout);
scene.addItem(form);

You can add widgets, layouts, stretches (addStretch(), insertStretch() or setStretchFactor()), and spacings (setItemSpacing()) to a linear layout. The layout takes ownership of the items. In some cases when the layout item also inherits from QGraphicsItem (such as 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() and itemAt(). Calling removeAt() or removeItem() will remove an item from the layout, without destroying it.

Size Hints and Size Policies in QGraphicsLinearLayout

QGraphicsLinearLayout respects each item's size hints and size policies, and when the layout contains 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(). By default, items are aligned to the top left.

Spacing within QGraphicsLinearLayout

Between the items, the layout distributes some space. The actual amount of space depends on the managed widget's current style, but the common spacing is 4. You can also set your own spacing by calling setSpacing(), and get the current spacing value by calling spacing(). If you want to configure individual spacing for your items, you can call setItemSpacing().

Stretch Factor in QGraphicsLinearLayout

You can assign a stretch factor to each item to control how much space it will get compared to the other items. By default, two identical widgets arranged in a linear layout will have the same size, but if the first widget has a stretch factor of 1 and the second widget has a stretch factor of 2, the first widget will get 1/3 of the available space, and the second will get 2/3.

QGraphicsLinearLayout calculates the distribution of sizes by adding up the stretch factors of all items, and then dividing the available space accordingly. The default stretch factor is 0 for all items; a factor of 0 means the item does not have any defined stretch factor; effectively this is the same as setting the stretch factor to 1. The stretch factor only applies to the available space in the lengthwise direction of the layout (following its orientation). If you want to control both the item's horizontal and vertical stretch, you can use QGraphicsGridLayout instead.

QGraphicsLinearLayout Compared to Other Layouts

QGraphicsLinearLayout is very similar to QVBoxLayout and QHBoxLayout, but in contrast to these classes, it is used to manage QGraphicsWidget and QGraphicsLayout instead of QWidget and QLayout.

See also: QGraphicsGridLayout, QGraphicsWidget

Definition at line 58 of file qgraphicslinearlayout.h.

Constructors and Destructors

◆ QGraphicsLinearLayout() [1/2]

QGraphicsLinearLayout::QGraphicsLinearLayout ( QGraphicsLayoutItem * parent = 0 )

Constructs a QGraphicsLinearLayout instance using Qt::Horizontal orientation.

parent is passed to QGraphicsLayout's constructor.

Definition at line 200 of file qgraphicslinearlayout.cpp.

     : QGraphicsLayout(*new QGraphicsLinearLayoutPrivate(Qt::Horizontal), parent)
 {
 }

◆ QGraphicsLinearLayout() [2/2]

QGraphicsLinearLayout::QGraphicsLinearLayout	(	Qt::Orientation	orientation,
		QGraphicsLayoutItem *	parent = `0`
	)

Constructs a QGraphicsLinearLayout instance.

You can pass the orientation for the layout, either horizontal or vertical, and parent is passed to QGraphicsLayout's constructor.

Definition at line 191 of file qgraphicslinearlayout.cpp.

     : QGraphicsLayout(*new QGraphicsLinearLayoutPrivate(orientation), parent)
 {
 }

◆ ~QGraphicsLinearLayout()

QGraphicsLinearLayout::~QGraphicsLinearLayout ( )

virtual

Destroys the QGraphicsLinearLayout object.

Definition at line 208 of file qgraphicslinearlayout.cpp.

 {
     for (int i = count() - 1; i >= 0; --i) {
         QGraphicsLayoutItem *item = itemAt(i);
         // The following lines can be removed, but this removes the item
         // from the layout more efficiently than the implementation of
         // ~QGraphicsLayoutItem.
         removeAt(i);
         if (item) {
             item->setParentLayoutItem(0);
             if (item->ownedByLayout())
                 delete item;
         }
     }
 }

Functions

◆ addItem()

void QGraphicsLinearLayout::addItem ( QGraphicsLayoutItem * item )

inline

This convenience function is equivalent to calling insertItem(-1, item).

Definition at line 68 of file qgraphicslinearlayout.h.

68 { insertItem(-1, item); }

QGraphicsLinearLayout::insertItem

void insertItem(int index, QGraphicsLayoutItem *item)

Inserts item into the layout at index, or before any item that is currently at index.

Definition: qgraphicslinearlayout.cpp:273

◆ addStretch()

void QGraphicsLinearLayout::addStretch ( int stretch = 1 )

inline

This convenience function is equivalent to calling insertStretch(-1, stretch).

Definition at line 69 of file qgraphicslinearlayout.h.

69 { insertStretch(-1, stretch); }

QGraphicsLinearLayout::insertStretch

void insertStretch(int index, int stretch=1)

Inserts a stretch of stretch at index, or before any item that is currently at index.

Definition: qgraphicslinearlayout.cpp:299

◆ alignment()

Qt::Alignment QGraphicsLinearLayout::alignment ( QGraphicsLayoutItem * item ) const

Returns the alignment for item.

The default alignment is Qt::AlignTop | Qt::AlignLeft.

The alignment decides how the item is positioned within its assigned space in the case where there's more space available in the layout than the widgets can occupy.

See also: setAlignment()

Definition at line 459 of file qgraphicslinearlayout.cpp.

Referenced by setAlignment().

 {
     Q_D(const QGraphicsLinearLayout);
     return d->engine.alignment(item);
 }

◆ count()

int QGraphicsLinearLayout::count ( ) const

virtual

Reimplemented Function

Implements QGraphicsLayout.

Definition at line 475 of file qgraphicslinearlayout.cpp.

Referenced by ~QGraphicsLinearLayout().

 {
     Q_D(const QGraphicsLinearLayout);
     return d->engine.itemCount();
 }

◆ dump()

void QGraphicsLinearLayout::dump ( int indent = 0 ) const

Warning: This function is not part of the public interface.

Definition at line 557 of file qgraphicslinearlayout.cpp.

Referenced by setGeometry().

 {
 #ifdef QT_DEBUG
     if (qt_graphicsLayoutDebug()) {
         Q_D(const QGraphicsLinearLayout);
         qDebug("%*s%s layout", indent, "",
                d->orientation == Qt::Horizontal ? "Horizontal" : "Vertical");
         d->engine.dump(indent + 1);
     }
 #else
     Q_UNUSED(indent);
 #endif
 }

◆ insertItem()

void QGraphicsLinearLayout::insertItem	(	int	index,
		QGraphicsLayoutItem *	item
	)

Inserts item into the layout at index, or before any item that is currently at index.

See also: addItem(), itemAt(), insertStretch(), setItemSpacing()

Definition at line 273 of file qgraphicslinearlayout.cpp.

 {
     Q_D(QGraphicsLinearLayout);
     if (!item) {
         qWarning("QGraphicsLinearLayout::insertItem: cannot insert null item");
         return;
     }
     if (item == this) {
         qWarning("QGraphicsLinearLayout::insertItem: cannot insert itself");
         return;
     }
     d->addChildLayoutItem(item);
 
     Q_ASSERT(item);
     d->fixIndex(&index);
     d->engine.insertRow(index, d->orientation);
     new QGridLayoutItem(&d->engine, item, d->gridRow(index), d->gridColumn(index), 1, 1, 0, index);
     invalidate();
 }

◆ insertStretch()

void QGraphicsLinearLayout::insertStretch	(	int	index,
		int	stretch = `1`
	)

Inserts a stretch of stretch at index, or before any item that is currently at index.

See also: addStretch(), setStretchFactor(), setItemSpacing(), insertItem()

Definition at line 299 of file qgraphicslinearlayout.cpp.

 {
     Q_D(QGraphicsLinearLayout);
     d->fixIndex(&index);
     d->engine.insertRow(index, d->orientation);
     d->engine.setRowStretchFactor(index, stretch, d->orientation);
     invalidate();
 }

◆ invalidate()

void QGraphicsLinearLayout::invalidate ( )

virtual

Reimplemented Function

Reimplemented from QGraphicsLayout.

Definition at line 547 of file qgraphicslinearlayout.cpp.

Referenced by insertItem(), insertStretch(), removeAt(), removeItem(), setAlignment(), setItemSpacing(), setOrientation(), setSpacing(), and setStretchFactor().

 {
     Q_D(QGraphicsLinearLayout);
     d->engine.invalidate();
     QGraphicsLayout::invalidate();
 }

◆ itemAt()

QGraphicsLayoutItem * QGraphicsLinearLayout::itemAt ( int index ) const

virtual

When iterating from 0 and up, it will return the items in the visual arranged order.

Reimplemented Function

Implements QGraphicsLayout.

Definition at line 488 of file qgraphicslinearlayout.cpp.

Referenced by ~QGraphicsLinearLayout().

 {
     Q_D(const QGraphicsLinearLayout);
     if (index < 0 || index >= d->engine.itemCount()) {
         qWarning("QGraphicsLinearLayout::itemAt: invalid index %d", index);
         return 0;
     }
     QGraphicsLayoutItem *item = 0;
     if (QGridLayoutItem *gridItem = d->engine.itemAt(index))
         item = gridItem->layoutItem();
     return item;
 }

◆ itemSpacing()

qreal QGraphicsLinearLayout::itemSpacing ( int index ) const

Returns the spacing after item at index.

Definition at line 388 of file qgraphicslinearlayout.cpp.

 {
     Q_D(const QGraphicsLinearLayout);
     return d->engine.rowSpacing(index, d->orientation);
 }

◆ orientation()

Qt::Orientation QGraphicsLinearLayout::orientation ( ) const

Returns the layout orientation.

See also: setOrientation()

Definition at line 244 of file qgraphicslinearlayout.cpp.

Referenced by setOrientation().

 {
     Q_D(const QGraphicsLinearLayout);
     return d->orientation;
 }

◆ removeAt()

void QGraphicsLinearLayout::removeAt ( int index )

virtual

Removes the item at index without destroying it.

Ownership of the item is transferred to the caller.

See also: removeItem(), insertItem()

Implements QGraphicsLayout.

Definition at line 331 of file qgraphicslinearlayout.cpp.

Referenced by ~QGraphicsLinearLayout().

 {
     Q_D(QGraphicsLinearLayout);
     if (index < 0 || index >= d->engine.itemCount()) {
         qWarning("QGraphicsLinearLayout::removeAt: invalid index %d", index);
         return;
     }
     if (QGridLayoutItem *gridItem = d->engine.itemAt(index)) {
         if (QGraphicsLayoutItem *layoutItem = gridItem->layoutItem())
             layoutItem->setParentLayoutItem(0);
         d->removeGridItem(gridItem);
         delete gridItem;
         invalidate();
     }
 }

◆ removeItem()

void QGraphicsLinearLayout::removeItem ( QGraphicsLayoutItem * item )

Removes item from the layout without destroying it.

Ownership of item is transferred to the caller.

See also: removeAt(), insertItem()

Definition at line 314 of file qgraphicslinearlayout.cpp.

 {
     Q_D(QGraphicsLinearLayout);
     if (QGridLayoutItem *gridItem = d->engine.findLayoutItem(item)) {
         item->setParentLayoutItem(0);
         d->removeGridItem(gridItem);
         delete gridItem;
         invalidate();
     }
 }

◆ setAlignment()

void QGraphicsLinearLayout::setAlignment	(	QGraphicsLayoutItem *	item,
		Qt::Alignment	alignment
	)

Sets the alignment of item to alignment.

If item's alignment changes, the layout is automatically invalidated.

See also: alignment(), invalidate()

Definition at line 440 of file qgraphicslinearlayout.cpp.

 {
     Q_D(QGraphicsLinearLayout);
     if (this->alignment(item) == alignment)
         return;
     d->engine.setAlignment(item, alignment);
     invalidate();
 }

◆ setGeometry()

void QGraphicsLinearLayout::setGeometry ( const QRectF & rect )

virtual

Reimplemented Function

Reimplemented from QGraphicsLayoutItem.

Definition at line 504 of file qgraphicslinearlayout.cpp.

 {
     Q_D(QGraphicsLinearLayout);
     QGraphicsLayout::setGeometry(rect);
     QRectF effectiveRect = geometry();
     qreal left, top, right, bottom;
     getContentsMargins(&left, &top, &right, &bottom);
     Qt::LayoutDirection visualDir = d->visualDirection();
     d->engine.setVisualDirection(visualDir);
     if (visualDir == Qt::RightToLeft)
         qSwap(left, right);
     effectiveRect.adjust(+left, +top, -right, -bottom);
 #ifdef QT_DEBUG
     if (qt_graphicsLayoutDebug()) {
         static int counter = 0;
         qDebug() << counter++ << "QGraphicsLinearLayout::setGeometry - " << rect;
         dump(1);
     }
 #endif
     d->engine.setGeometries(d->styleInfo(), effectiveRect);
 #ifdef QT_DEBUG
     if (qt_graphicsLayoutDebug()) {
         qDebug() << "post dump";
         dump(1);
     }
 #endif
 }

◆ setItemSpacing()

void QGraphicsLinearLayout::setItemSpacing	(	int	index,
		qreal	spacing
	)

Sets the spacing after item at index to spacing.

Definition at line 379 of file qgraphicslinearlayout.cpp.

 {
     Q_D(QGraphicsLinearLayout);
     d->engine.setRowSpacing(index, spacing, d->orientation);
     invalidate();
 }

◆ setOrientation()

void QGraphicsLinearLayout::setOrientation ( Qt::Orientation orientation )

Change the layout orientation to orientation.

Changing the layout orientation will automatically invalidate the layout.

See also: orientation()

Definition at line 230 of file qgraphicslinearlayout.cpp.

 {
     Q_D(QGraphicsLinearLayout);
     if (orientation != d->orientation) {
         d->engine.transpose();
         d->orientation = orientation;
         invalidate();
     }
 }

◆ setSpacing()

void QGraphicsLinearLayout::setSpacing ( qreal spacing )

Sets the layout's spacing to spacing.

Spacing refers to the vertical and horizontal distances between items.

See also: setItemSpacing(), setStretchFactor(), QGraphicsGridLayout::setSpacing()

Definition at line 353 of file qgraphicslinearlayout.cpp.

 {
     Q_D(QGraphicsLinearLayout);
     if (spacing < 0) {
         qWarning("QGraphicsLinearLayout::setSpacing: invalid spacing %g", spacing);
         return;
     }
     d->engine.setSpacing(spacing, Qt::Horizontal | Qt::Vertical);
     invalidate();
 }

◆ setStretchFactor()

void QGraphicsLinearLayout::setStretchFactor	(	QGraphicsLayoutItem *	item,
		int	stretch
	)

Sets the stretch factor for item to stretch.

If an item's stretch factor changes, this function will invalidate the layout.

Setting stretch to 0 removes the stretch factor from the item, and is effectively equivalent to setting stretch to 1.

See also: stretchFactor()

Definition at line 403 of file qgraphicslinearlayout.cpp.

 {
     Q_D(QGraphicsLinearLayout);
     if (!item) {
         qWarning("QGraphicsLinearLayout::setStretchFactor: cannot assign"
                  " a stretch factor to a null item");
         return;
     }
     if (stretchFactor(item) == stretch)
         return;
     d->engine.setStretchFactor(item, stretch, d->orientation);
     invalidate();
 }

◆ sizeHint()

QSizeF QGraphicsLinearLayout::sizeHint	(	Qt::SizeHint	which,
		const QSizeF &	constraint = `QSizeF()`
	)		const

virtual

Reimplemented Function

Implements QGraphicsLayoutItem.

Definition at line 535 of file qgraphicslinearlayout.cpp.

 {
     Q_D(const QGraphicsLinearLayout);
     qreal left, top, right, bottom;
     getContentsMargins(&left, &top, &right, &bottom);
     const QSizeF extraMargins(left + right, top + bottom);
     return d->engine.sizeHint(d->styleInfo(), which , constraint - extraMargins) + extraMargins;
 }

◆ spacing()

qreal QGraphicsLinearLayout::spacing ( ) const

Returns the layout's spacing.

Spacing refers to the vertical and horizontal distances between items.

See also: setSpacing()

Definition at line 370 of file qgraphicslinearlayout.cpp.

 {
     Q_D(const QGraphicsLinearLayout);
     return d->engine.spacing(d->styleInfo(), d->orientation);
 }

◆ stretchFactor()

int QGraphicsLinearLayout::stretchFactor ( QGraphicsLayoutItem * item ) const

Returns the stretch factor for item.

The default stretch factor is 0, meaning that the item has no assigned stretch factor.

See also: setStretchFactor()

Definition at line 423 of file qgraphicslinearlayout.cpp.

Referenced by setStretchFactor().

 {
     Q_D(const QGraphicsLinearLayout);
     if (!item) {
         qWarning("QGraphicsLinearLayout::setStretchFactor: cannot return"
                  " a stretch factor for a null item");
         return 0;
     }
     return d->engine.stretchFactor(item, d->orientation);
 }

The documentation for this class was generated from the following files:

/src/gui/graphicsview/qgraphicslinearlayout.h
/src/gui/graphicsview/qgraphicslinearlayout.cpp

Public Functions

Additional Inherited Members

Detailed Description

Size Hints and Size Policies in QGraphicsLinearLayout

Spacing within QGraphicsLinearLayout

Stretch Factor in QGraphicsLinearLayout

QGraphicsLinearLayout Compared to Other Layouts

Constructors and Destructors

◆ QGraphicsLinearLayout() [1/2]

◆ QGraphicsLinearLayout() [2/2]

◆ ~QGraphicsLinearLayout()

Functions

◆ addItem()

◆ addStretch()

◆ alignment()

◆ count()

◆ dump()

◆ insertItem()

◆ insertStretch()

◆ invalidate()

◆ itemAt()

◆ itemSpacing()

◆ orientation()

◆ removeAt()

◆ removeItem()

◆ setAlignment()

◆ setGeometry()

◆ setItemSpacing()

◆ setOrientation()

◆ setSpacing()

◆ setStretchFactor()

◆ sizeHint()

◆ spacing()

◆ stretchFactor()