QCPLayout Class Reference

Inheritance diagram for QCPLayout:

Public Member Functions
	QCPLayout ()
void	clear ()
virtual QCPLayoutElement *	elementAt (int index) const =0
virtual int	elementCount () const =0
virtual QList< QCPLayoutElement * >	elements (bool recursive) const override
bool	remove (QCPLayoutElement *element)
bool	removeAt (int index)
virtual void	simplify ()
virtual bool	take (QCPLayoutElement *element)=0
virtual QCPLayoutElement *	takeAt (int index)=0
virtual void	update (UpdatePhase phase) override
Public Member Functions inherited from QCPLayoutElement
	QCPLayoutElement (QCustomPlot *parentPlot=nullptr)
QCP::MarginSides	autoMargins () const
QCPLayout *	layout () const
QCPMarginGroup *	marginGroup (QCP::MarginSide side) const
QHash< QCP::MarginSide, QCPMarginGroup * >	marginGroups () const
QMargins	margins () const
virtual QSize	maximumOuterSizeHint () const
QSize	maximumSize () const
QMargins	minimumMargins () const
virtual QSize	minimumOuterSizeHint () const
QSize	minimumSize () const
QRect	outerRect () const
QRect	rect () const
virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=nullptr) const override
void	setAutoMargins (QCP::MarginSides sides)
void	setMarginGroup (QCP::MarginSides sides, QCPMarginGroup *group)
void	setMargins (const QMargins &margins)
void	setMaximumSize (const QSize &size)
void	setMaximumSize (int width, int height)
void	setMinimumMargins (const QMargins &margins)
void	setMinimumSize (const QSize &size)
void	setMinimumSize (int width, int height)
void	setOuterRect (const QRect &rect)
void	setSizeConstraintRect (SizeConstraintRect constraintRect)
SizeConstraintRect	sizeConstraintRect () const
Public Member Functions inherited from QCPLayerable
	QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=nullptr)
bool	antialiased () const
QCPLayer *	layer () const
QCPLayerable *	parentLayerable () const
QCustomPlot *	parentPlot () const
bool	realVisibility () const
void	setAntialiased (bool enabled)
bool	setLayer (const QString &layerName)
Q_SLOT bool	setLayer (QCPLayer *layer)
void	setVisible (bool on)
bool	visible () const
Public Member Functions inherited from QObject
	QObject (QObject *parent)
QBindable< QString >	bindableObjectName ()
bool	blockSignals (bool block)
const QObjectList &	children () const const
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const
void	deleteLater ()
void	destroyed (QObject *obj)
bool	disconnect (const char *signal, const QObject *receiver, const char *method) const const
bool	disconnect (const QObject *receiver, const char *method) const const
void	dumpObjectInfo () const const
void	dumpObjectTree () const const
QList< QByteArray >	dynamicPropertyNames () const const
virtual bool	event (QEvent *e)
virtual bool	eventFilter (QObject *watched, QEvent *event)
T	findChild (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (Qt::FindChildOptions options) const const
bool	inherits (const char *className) const const
void	installEventFilter (QObject *filterObj)
bool	isQuickItemType () const const
bool	isWidgetType () const const
bool	isWindowType () const const
void	killTimer (int id)
virtual const QMetaObject *	metaObject () const const
void	moveToThread (QThread *targetThread)
QString	objectName () const const
void	objectNameChanged (const QString &objectName)
QObject *	parent () const const
QVariant	property (const char *name) const const
	Q_CLASSINFO (Name, Value)
	Q_EMIT Q_EMIT
	Q_ENUM (...)
	Q_ENUM_NS (...)
	Q_ENUMS (...)
	Q_FLAG (...)
	Q_FLAG_NS (...)
	Q_FLAGS (...)
	Q_GADGET Q_GADGET
	Q_GADGET_EXPORT (EXPORT_MACRO)
	Q_INTERFACES (...)
	Q_INVOKABLE Q_INVOKABLE
	Q_MOC_INCLUDE Q_MOC_INCLUDE
	Q_NAMESPACE Q_NAMESPACE
	Q_NAMESPACE_EXPORT (EXPORT_MACRO)
	Q_OBJECT Q_OBJECT
	Q_PROPERTY (...)
	Q_REVISION Q_REVISION
	Q_SET_OBJECT_NAME (Object)
	Q_SIGNAL Q_SIGNAL
	Q_SIGNALS Q_SIGNALS
	Q_SLOT Q_SLOT
	Q_SLOTS Q_SLOTS
T	qobject_cast (const QObject *object)
T	qobject_cast (QObject *object)
	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT
void	removeEventFilter (QObject *obj)
void	setObjectName (const QString &name)
void	setObjectName (QAnyStringView name)
void	setParent (QObject *parent)
bool	setProperty (const char *name, const QVariant &value)
bool	setProperty (const char *name, QVariant &&value)
bool	signalsBlocked () const const
int	startTimer (int interval, Qt::TimerType timerType)
int	startTimer (std::chrono::milliseconds interval, Qt::TimerType timerType)
QThread *	thread () const const

Protected Member Functions
void	adoptElement (QCPLayoutElement *el)
QVector< int >	getSectionSizes (QVector< int > maxSizes, QVector< int > minSizes, QVector< double > stretchFactors, int totalSize) const
void	releaseElement (QCPLayoutElement *el)
void	sizeConstraintsChanged () const
virtual void	updateLayout ()
Protected Member Functions inherited from QCPLayoutElement
virtual void	applyDefaultAntialiasingHint (QCPPainter *painter) const override
virtual int	calculateAutoMargin (QCP::MarginSide side)
virtual void	draw (QCPPainter *painter) override
virtual void	layoutChanged ()
virtual void	parentPlotInitialized (QCustomPlot *parentPlot) override
Protected Member Functions inherited from QCPLayerable
void	applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const
virtual QRect	clipRect () const
virtual void	deselectEvent (bool *selectionStateChanged)
void	initializeParentPlot (QCustomPlot *parentPlot)
virtual void	mouseDoubleClickEvent (QMouseEvent *event, const QVariant &details)
virtual void	mouseMoveEvent (QMouseEvent *event, const QPointF &startPos)
virtual void	mousePressEvent (QMouseEvent *event, const QVariant &details)
virtual void	mouseReleaseEvent (QMouseEvent *event, const QPointF &startPos)
bool	moveToLayer (QCPLayer *layer, bool prepend)
virtual void	selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged)
virtual QCP::Interaction	selectionCategory () const
void	setParentLayerable (QCPLayerable *parentLayerable)
virtual void	wheelEvent (QWheelEvent *event)
Protected Member Functions inherited from QObject
virtual void	childEvent (QChildEvent *event)
virtual void	connectNotify (const QMetaMethod &signal)
virtual void	customEvent (QEvent *event)
virtual void	disconnectNotify (const QMetaMethod &signal)
bool	isSignalConnected (const QMetaMethod &signal) const const
int	receivers (const char *signal) const const
QObject *	sender () const const
int	senderSignalIndex () const const
virtual void	timerEvent (QTimerEvent *event)

Static Protected Member Functions
static QSize	getFinalMaximumOuterSize (const QCPLayoutElement *el)
static QSize	getFinalMinimumOuterSize (const QCPLayoutElement *el)

Additional Inherited Members
Public Types inherited from QCPLayoutElement
enum	SizeConstraintRect { scrInnerRect , scrOuterRect }
enum	UpdatePhase { upPreparation , upMargins , upLayout }
Public Types inherited from QObject
typedef	QObjectList
Properties inherited from QObject
	objectName
Signals inherited from QCPLayerable
void	layerChanged (QCPLayer *newLayer)
Static Public Member Functions inherited from QObject
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)
bool	disconnect (const QMetaObject::Connection &connection)
bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *method)
bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method)
bool	disconnect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method)
QString	tr (const char *sourceText, const char *disambiguation, int n)
Protected Attributes inherited from QCPLayoutElement
QCP::MarginSides	mAutoMargins
QHash< QCP::MarginSide, QCPMarginGroup * >	mMarginGroups
QMargins	mMargins
QSize	mMaximumSize
QMargins	mMinimumMargins
QSize	mMinimumSize
QRect	mOuterRect
QCPLayout *	mParentLayout
QRect	mRect
SizeConstraintRect	mSizeConstraintRect
Protected Attributes inherited from QCPLayerable
bool	mAntialiased
QCPLayer *	mLayer
QPointer< QCPLayerable >	mParentLayerable
QCustomPlot *	mParentPlot
bool	mVisible

Detailed Description

The abstract base class for layouts.

This is an abstract base class for layout elements whose main purpose is to define the position and size of other child layout elements. In most cases, layouts don't draw anything themselves (but there are exceptions to this, e.g. QCPLegend).

QCPLayout derives from QCPLayoutElement, and thus can itself be nested in other layouts.

QCPLayout introduces a common interface for accessing and manipulating the child elements. Those functions are most notably elementCount, elementAt, takeAt, take, simplify, removeAt, remove and clear. Individual subclasses may add more functions to this interface which are more specialized to the form of the layout. For example, QCPLayoutGrid adds functions that take row and column indices to access cells of the layout grid more conveniently.

Since this is an abstract base class, you can't instantiate it directly. Rather use one of its subclasses like QCPLayoutGrid or QCPLayoutInset.

For a general introduction to the layout system, see the dedicated documentation page The Layout System.

Definition at line 1341 of file qcustomplot.h.

Constructor & Destructor Documentation

QCPLayout()

QCPLayout::QCPLayout ( )

explicit

Creates an instance of QCPLayout and sets default values. Note that since QCPLayout is an abstract base class, it can't be instantiated directly.

Definition at line 3666 of file qcustomplot.cpp.

Member Function Documentation

adoptElement()

void QCPLayout::adoptElement ( QCPLayoutElement * el )

protected

Associates el with this layout. This is done by setting the QCPLayoutElement::layout, the QCPLayerable::parentLayerable and the QObject parent to this layout.

Further, if el didn't previously have a parent plot, calls QCPLayerable::initializeParentPlot on el to set the paret plot.

This method is used by subclass specific methods that add elements to the layout. Note that this method only changes properties in el. The removal from the old layout and the insertion into the new layout must be done additionally.

Definition at line 3831 of file qcustomplot.cpp.

clear()

void QCPLayout::clear

(

)

Removes and deletes all layout elements in this layout. Finally calls simplify to make sure all empty cells are collapsed.

See also

remove, removeAt

Definition at line 3776 of file qcustomplot.cpp.

elementAt()

virtual QCPLayoutElement * QCPLayout::elementAt ( int index ) const

pure virtual

Returns the element in the cell with the given index. If index is invalid, returns nullptr.

Note that even if index is valid, the respective cell may be empty in some layouts (e.g. QCPLayoutGrid), so this function may return nullptr in those cases. You may use this function to check whether a cell is empty or not.

See also

elements, elementCount, takeAt

Implemented in QCPLayoutGrid, and QCPLayoutInset.

elementCount()

virtual int QCPLayout::elementCount ( ) const

pure virtual

Returns the number of elements/cells in the layout.

See also

elements, elementAt

Implemented in QCPLayoutGrid, and QCPLayoutInset.

elements()

QList< QCPLayoutElement * > QCPLayout::elements ( bool recursive ) const

overridevirtual

Returns a list of all child elements in this layout element. If recursive is true, all sub-child elements are included in the list, too.

Warning

There may be nullptr entries in the returned list. For example, QCPLayoutGrid may have empty cells which yield nullptr at the respective index.

Reimplemented from QCPLayoutElement.

Reimplemented in QCPLayoutGrid.

Definition at line 3697 of file qcustomplot.cpp.

getFinalMaximumOuterSize()

QSize QCPLayout::getFinalMaximumOuterSize ( const QCPLayoutElement * el )

staticprotected

This is a helper function for the implementation of subclasses.

It returns the maximum size that should finally be used for the outer rect of the passed layout element el.

It takes into account whether a manual maximum size is set (QCPLayoutElement::setMaximumSize), which size constraint is set (QCPLayoutElement::setSizeConstraintRect), as well as the maximum size hint, if no manual maximum size was set (QCPLayoutElement::maximumOuterSizeHint).

Definition at line 4045 of file qcustomplot.cpp.

getFinalMinimumOuterSize()

QSize QCPLayout::getFinalMinimumOuterSize ( const QCPLayoutElement * el )

staticprotected

This is a helper function for the implementation of subclasses.

It returns the minimum size that should finally be used for the outer rect of the passed layout element el.

It takes into account whether a manual minimum size is set (QCPLayoutElement::setMinimumSize), which size constraint is set (QCPLayoutElement::setSizeConstraintRect), as well as the minimum size hint, if no manual minimum size was set (QCPLayoutElement::minimumOuterSizeHint).

Definition at line 4020 of file qcustomplot.cpp.

getSectionSizes()

QVector< int > QCPLayout::getSectionSizes ( QVector< int > maxSizes, QVector< int > minSizes, QVector< double > stretchFactors, int totalSize ) const

protected

This is a helper function for the implementation of updateLayout in subclasses.

It calculates the sizes of one-dimensional sections with provided constraints on maximum section sizes, minimum section sizes, relative stretch factors and the final total size of all sections.

The QVector entries refer to the sections. Thus all QVectors must have the same size.

maxSizes gives the maximum allowed size of each section. If there shall be no maximum size imposed, set all vector values to Qt's QWIDGETSIZE_MAX.

minSizes gives the minimum allowed size of each section. If there shall be no minimum size imposed, set all vector values to zero. If the minSizes entries add up to a value greater than totalSize, sections will be scaled smaller than the proposed minimum sizes. (In other words, not exceeding the allowed total size is taken to be more important than not going below minimum section sizes.)

stretchFactors give the relative proportions of the sections to each other. If all sections shall be scaled equally, set all values equal. If the first section shall be double the size of each individual other section, set the first number of stretchFactors to double the value of the other individual values (e.g. {2, 1, 1, 1}).

totalSize is the value that the final section sizes will add up to. Due to rounding, the actual sum may differ slightly. If you want the section sizes to sum up to exactly that value, you could distribute the remaining difference on the sections.

The return value is a QVector containing the section sizes.

Definition at line 3896 of file qcustomplot.cpp.

releaseElement()

void QCPLayout::releaseElement ( QCPLayoutElement * el )

protected

Disassociates el from this layout. This is done by setting the QCPLayoutElement::layout and the QCPLayerable::parentLayerable to zero. The QObject parent is set to the parent QCustomPlot.

This method is used by subclass specific methods that remove elements from the layout (e.g. take or takeAt). Note that this method only changes properties in el. The removal from the old layout must be done additionally.

Definition at line 3855 of file qcustomplot.cpp.

remove()

bool QCPLayout::remove

(

QCPLayoutElement *

element

)

Removes and deletes the provided element. Returns true on success. If element is not in the layout, returns false.

This function internally uses takeAt to remove the element from the layout and then deletes the element. Note that some layouts don't remove the respective cell right away but leave an empty cell after successful removal of the layout element. To collapse empty cells, use simplify.

See also

removeAt, take

Definition at line 3760 of file qcustomplot.cpp.

removeAt()

bool QCPLayout::removeAt

(

int

index

)

Removes and deletes the element at the provided index. Returns true on success. If index is invalid or points to an empty cell, returns false.

This function internally uses takeAt to remove the element from the layout and then deletes the returned element. Note that some layouts don't remove the respective cell right away but leave an empty cell after successful removal of the layout element. To collapse empty cells, use simplify.

See also

remove, takeAt

Definition at line 3739 of file qcustomplot.cpp.

simplify()

void QCPLayout::simplify ( )

virtual

Simplifies the layout by collapsing empty cells. The exact behavior depends on subclasses, the default implementation does nothing.

Not all layouts need simplification. For example, QCPLayoutInset doesn't use explicit simplification while QCPLayoutGrid does.

Reimplemented in QCPLayoutGrid, and QCPLayoutInset.

Definition at line 3724 of file qcustomplot.cpp.

sizeConstraintsChanged()

void QCPLayout::sizeConstraintsChanged ( ) const

protected

Subclasses call this method to report changed (minimum/maximum) size constraints.

If the parent of this layout is again a QCPLayout, forwards the call to the parent's sizeConstraintsChanged. If the parent is a QWidget (i.e. is the QCustomPlot::plotLayout of QCustomPlot), calls QWidget::updateGeometry, so if the QCustomPlot widget is inside a Qt QLayout, it may update itself and resize cells accordingly.

Definition at line 3794 of file qcustomplot.cpp.

take()

virtual bool QCPLayout::take ( QCPLayoutElement * element )

pure virtual

Removes the specified element from the layout and returns true on success.

If the element isn't in this layout, returns false.

Note that some layouts don't remove the respective cell right away but leave an empty cell after successful removal of the layout element. To collapse empty cells, use simplify.

See also

takeAt

Implemented in QCPLayoutGrid, and QCPLayoutInset.

takeAt()

virtual QCPLayoutElement * QCPLayout::takeAt ( int index )

pure virtual

Removes the element with the given index from the layout and returns it.

If the index is invalid or the cell with that index is empty, returns nullptr.

Note that some layouts don't remove the respective cell right away but leave an empty cell after successful removal of the layout element. To collapse empty cells, use simplify.

See also

elementAt, take

Implemented in QCPLayoutGrid, and QCPLayoutInset.

update()

void QCPLayout::update ( UpdatePhase phase )

overridevirtual

If phase is upLayout, calls updateLayout, which subclasses may reimplement to reposition and resize their cells.

Finally, the call is propagated down to all child QCPLayoutElements.

For details about this method and the update phases, see the documentation of QCPLayoutElement::update.

Reimplemented from QCPLayoutElement.

Definition at line 3679 of file qcustomplot.cpp.

updateLayout()

void QCPLayout::updateLayout ( )

protectedvirtual

Subclasses reimplement this method to update the position and sizes of the child elements/cells via calling their QCPLayoutElement::setOuterRect. The default implementation does nothing.

The geometry used as a reference is the inner rect of this layout. Child elements should stay within that rect.

getSectionSizes may help with the reimplementation of this function.

See also

update

Reimplemented in QCPLayoutGrid, and QCPLayoutInset.

Definition at line 3814 of file qcustomplot.cpp.

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

• qcustomplot.h
• qcustomplot.cpp