Manages a legend inside a QCustomPlot. More...

Inheritance diagram for QCPLegend:

Public Types
enum	SelectablePart { spNone = 0x000, spLegendBox = 0x001, spItems = 0x002 }

Signals
void	selectionChanged (QCPLegend::SelectableParts selection)

Public Member Functions
	QCPLegend ()

QPen	borderPen () const

QBrush	brush () const

QFont	font () const

QColor	textColor () const

QSize	iconSize () const

int	iconTextPadding () const

QPen	iconBorderPen () const

SelectableParts	selectableParts () const

SelectableParts	selectedParts () const

QPen	selectedBorderPen () const

QPen	selectedIconBorderPen () const

QBrush	selectedBrush () const

QFont	selectedFont () const

QColor	selectedTextColor () const

void	setBorderPen (const QPen &pen)

void	setBrush (const QBrush &brush)

void	setFont (const QFont &font)

void	setTextColor (const QColor &color)

void	setIconSize (const QSize &size)

void	setIconSize (int width, int height)

void	setIconTextPadding (int padding)

void	setIconBorderPen (const QPen &pen)

void	setSelectableParts (const SelectableParts &selectableParts)

void	setSelectedParts (const SelectableParts &selectedParts)

void	setSelectedBorderPen (const QPen &pen)

void	setSelectedIconBorderPen (const QPen &pen)

void	setSelectedBrush (const QBrush &brush)

void	setSelectedFont (const QFont &font)

void	setSelectedTextColor (const QColor &color)

virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const

QCPAbstractLegendItem *	item (int index) const

QCPPlottableLegendItem *	itemWithPlottable (const QCPAbstractPlottable *plottable) const

int	itemCount () const

bool	hasItem (QCPAbstractLegendItem *item) const

bool	hasItemWithPlottable (const QCPAbstractPlottable *plottable) const

bool	addItem (QCPAbstractLegendItem *item)

bool	removeItem (int index)

bool	removeItem (QCPAbstractLegendItem *item)

void	clearItems ()

QList< QCPAbstractLegendItem * >	selectedItems () const

Public Member Functions inherited from QCPLayoutGrid
	QCPLayoutGrid ()

int	rowCount () const

int	columnCount () const

QList< double >	columnStretchFactors () const

QList< double >	rowStretchFactors () const

int	columnSpacing () const

int	rowSpacing () const

void	setColumnStretchFactor (int column, double factor)

void	setColumnStretchFactors (const QList< double > &factors)

void	setRowStretchFactor (int row, double factor)

void	setRowStretchFactors (const QList< double > &factors)

void	setColumnSpacing (int pixels)

void	setRowSpacing (int pixels)

virtual void	updateLayout ()

virtual int	elementCount () const

virtual QCPLayoutElement *	elementAt (int index) const

virtual QCPLayoutElement *	takeAt (int index)

virtual bool	take (QCPLayoutElement *element)

virtual QList< QCPLayoutElement * >	elements (bool recursive) const

virtual void	simplify ()

virtual QSize	minimumSizeHint () const

virtual QSize	maximumSizeHint () const

QCPLayoutElement *	element (int row, int column) const

bool	addElement (int row, int column, QCPLayoutElement *element)

bool	hasElement (int row, int column)

void	expandTo (int newRowCount, int newColumnCount)

void	insertRow (int newIndex)

void	insertColumn (int newIndex)

Public Member Functions inherited from QCPLayout
	QCPLayout ()

virtual void	update ()

bool	removeAt (int index)

bool	remove (QCPLayoutElement *element)

void	clear ()

Public Member Functions inherited from QCPLayoutElement
	QCPLayoutElement (QCustomPlot *parentPlot=0)

QCPLayout *	layout () const

QRect	rect () const

QRect	outerRect () const

QMargins	margins () const

QMargins	minimumMargins () const

QCP::MarginSides	autoMargins () const

QSize	minimumSize () const

QSize	maximumSize () const

QCPMarginGroup *	marginGroup (QCP::MarginSide side) const

QHash< QCP::MarginSide, QCPMarginGroup * >	marginGroups () const

void	setOuterRect (const QRect &rect)

void	setMargins (const QMargins &margins)

void	setMinimumMargins (const QMargins &margins)

void	setAutoMargins (QCP::MarginSides sides)

void	setMinimumSize (const QSize &size)

void	setMinimumSize (int width, int height)

void	setMaximumSize (const QSize &size)

void	setMaximumSize (int width, int height)

void	setMarginGroup (QCP::MarginSides sides, QCPMarginGroup *group)

Public Member Functions inherited from QCPLayerable
	QCPLayerable (QCustomPlot plot, QString targetLayer="", QCPLayerable parentLayerable=0)

bool	visible () const

QCustomPlot *	parentPlot () const

QCPLayerable *	parentLayerable () const

QCPLayer *	layer () const

bool	antialiased () const

void	setVisible (bool on)

bool	setLayer (QCPLayer *layer)

bool	setLayer (const QString &layerName)

void	setAntialiased (bool enabled)

bool	realVisibility () const

Protected Member Functions
virtual void	parentPlotInitialized (QCustomPlot *parentPlot)

virtual QCP::Interaction	selectionCategory () const

virtual void	applyDefaultAntialiasingHint (QCPPainter *painter) const

virtual void	draw (QCPPainter *painter)

virtual void	selectEvent (QMouseEvent event, bool additive, const QVariant &details, bool selectionStateChanged)

virtual void	deselectEvent (bool *selectionStateChanged)

QPen	getBorderPen () const

QBrush	getBrush () const

Protected Member Functions inherited from QCPLayoutGrid
void	getMinimumRowColSizes (QVector< int > minColWidths, QVector< int > minRowHeights) const

void	getMaximumRowColSizes (QVector< int > maxColWidths, QVector< int > maxRowHeights) const

Protected Member Functions inherited from QCPLayout
void	sizeConstraintsChanged () const

void	adoptElement (QCPLayoutElement *el)

void	releaseElement (QCPLayoutElement *el)

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

Protected Member Functions inherited from QCPLayoutElement
virtual int	calculateAutoMargin (QCP::MarginSide side)

virtual void	mousePressEvent (QMouseEvent *event)

virtual void	mouseMoveEvent (QMouseEvent *event)

virtual void	mouseReleaseEvent (QMouseEvent *event)

virtual void	mouseDoubleClickEvent (QMouseEvent *event)

virtual void	wheelEvent (QWheelEvent *event)

Protected Member Functions inherited from QCPLayerable
virtual QRect	clipRect () const

void	initializeParentPlot (QCustomPlot *parentPlot)

void	setParentLayerable (QCPLayerable *parentLayerable)

bool	moveToLayer (QCPLayer *layer, bool prepend)

void	applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const

Protected Attributes
QPen	mBorderPen

QPen	mIconBorderPen

QBrush	mBrush

QFont	mFont

QColor	mTextColor

QSize	mIconSize

int	mIconTextPadding

SelectableParts	mSelectedParts

SelectableParts	mSelectableParts

QPen	mSelectedBorderPen

QPen	mSelectedIconBorderPen

QBrush	mSelectedBrush

QFont	mSelectedFont

QColor	mSelectedTextColor

Protected Attributes inherited from QCPLayoutGrid
QList< QList< QCPLayoutElement * > >	mElements

QList< double >	mColumnStretchFactors

QList< double >	mRowStretchFactors

int	mColumnSpacing

int	mRowSpacing

Protected Attributes inherited from QCPLayoutElement
QCPLayout *	mParentLayout

QSize	mMinimumSize

QSize	mMaximumSize

QRect	mRect

QRect	mOuterRect

QMargins	mMargins

QMargins	mMinimumMargins

QCP::MarginSides	mAutoMargins

QHash< QCP::MarginSide, QCPMarginGroup * >	mMarginGroups

Protected Attributes inherited from QCPLayerable
bool	mVisible

QCustomPlot *	mParentPlot

QPointer< QCPLayerable >	mParentLayerable

QCPLayer *	mLayer

bool	mAntialiased

Friends
class	QCustomPlot

class	QCPAbstractLegendItem

Detailed Description

Manages a legend inside a QCustomPlot.

A legend is a small box somewhere in the plot which lists plottables with their name and icon.

Normally, the legend is populated by calling QCPAbstractPlottable::addToLegend. The respective legend item can be removed with QCPAbstractPlottable::removeFromLegend. However, QCPLegend also offers an interface to add and manipulate legend items directly: item, itemWithPlottable, itemCount, addItem, removeItem, etc.

The QCPLegend derives from QCPLayoutGrid and as such can be placed in any position a QCPLayoutElement may be positioned. The legend items are themselves QCPLayoutElements which are placed in the grid layout of the legend. QCPLegend only adds an interface specialized for handling child elements of type QCPAbstractLegendItem, as mentioned above. In principle, any other layout elements may also be added to a legend via the normal QCPLayoutGrid interface. However, the QCPAbstractLegendItem-Interface will ignore those elements (e.g. itemCount will only return the number of items with QCPAbstractLegendItems type).

By default, every QCustomPlot has one legend (QCustomPlot::legend) which is placed in the inset layout of the main axis rect (QCPAxisRect::insetLayout). To move the legend to another position inside the axis rect, use the methods of the QCPLayoutInset. To move the legend outside of the axis rect, place it anywhere else with the QCPLayout/QCPLayoutElement interface.

Member Enumeration Documentation

enum QCPLegend::SelectablePart

Defines the selectable parts of a legend

See also: setSelectedParts, setSelectableParts

Enumerator
spNone	`0x000` None
spLegendBox	`0x001` The legend box (frame)
spItems	`0x002` Legend items individually (see selectedItems)

Constructor & Destructor Documentation

QCPLegend::QCPLegend ( )

explicit

Constructs a new QCPLegend instance with parentPlot as the containing plot and default values.

Note that by default, QCustomPlot already contains a legend ready to be used as QCustomPlot::legend

Member Function Documentation

bool QCPLegend::addItem ( QCPAbstractLegendItem * item )

Adds item to the legend, if it's not present already.

Returns true on sucess, i.e. if the item wasn't in the list already and has been successfuly added.

The legend takes ownership of the item.

void QCPLegend::clearItems ( )

Removes all items from the legend.

bool QCPLegend::hasItem ( QCPAbstractLegendItem * item ) const

Returns whether the legend contains itm.

bool QCPLegend::hasItemWithPlottable ( const QCPAbstractPlottable * plottable ) const

Returns whether the legend contains a QCPPlottableLegendItem which is associated with plottable (e.g. a QCPGraph*). If such an item isn't in the legend, returns false.

See also: itemWithPlottable

QCPAbstractLegendItem * QCPLegend::item ( int index ) const

Returns the item with index i.

See also: itemCount

int QCPLegend::itemCount ( ) const

Returns the number of items currently in the legend.

See also: item

QCPPlottableLegendItem * QCPLegend::itemWithPlottable ( const QCPAbstractPlottable * plottable ) const

Returns the QCPPlottableLegendItem which is associated with plottable (e.g. a QCPGraph*). If such an item isn't in the legend, returns 0.

See also: hasItemWithPlottable

bool QCPLegend::removeItem ( int index )

Removes the item with index index from the legend.

Returns true, if successful.

See also: itemCount, clearItems

bool QCPLegend::removeItem ( QCPAbstractLegendItem * item )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Removes item from the legend.

Returns true, if successful.

See also: clearItems

QList< QCPAbstractLegendItem * > QCPLegend::selectedItems ( ) const

Returns the legend items that are currently selected. If no items are selected, the list is empty.

See also: QCPAbstractLegendItem::setSelected, setSelectable

void QCPLegend::selectionChanged ( QCPLegend::SelectableParts selection )

signal

This signal is emitted when the selection state of this legend has changed.

See also: setSelectedParts, setSelectableParts

double QCPLegend::selectTest	(	const QPointF &	pos,
		bool	onlySelectable,
		QVariant *	details = `0`
	)		const

virtual

Layout elements are sensitive to events inside their outer rect. If pos is within the outer rect, this method returns a value corresponding to 0.99 times the parent plot's selection tolerance. However, layout elements are not selectable by default. So if onlySelectable is true, -1.0 is returned.

See QCPLayerable::selectTest for a general explanation of this virtual method.

QCPLayoutElement subclasses may reimplement this method to provide more specific selection test behaviour.

Reimplemented from QCPLayoutElement.

void QCPLegend::setBorderPen ( const QPen & pen )

Sets the pen, the border of the entire legend is drawn with.

void QCPLegend::setBrush ( const QBrush & brush )

Sets the brush of the legend background.

void QCPLegend::setFont ( const QFont & font )

Sets the default font of legend text. Legend items that draw text (e.g. the name of a graph) will use this font by default. However, a different font can be specified on a per-item-basis by accessing the specific legend item.

This function will also set font on all already existing legend items.

See also: QCPAbstractLegendItem::setFont

void QCPLegend::setIconBorderPen ( const QPen & pen )

Sets the pen used to draw a border around each legend icon. Legend items that draw an icon (e.g. a visual representation of the graph) will use this pen by default.

If no border is wanted, set this to Qt::NoPen.

void QCPLegend::setIconSize ( const QSize & size )

Sets the size of legend icons. Legend items that draw an icon (e.g. a visual representation of the graph) will use this size by default.

void QCPLegend::setIconSize	(	int	width,
		int	height
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

void QCPLegend::setIconTextPadding ( int padding )

Sets the horizontal space in pixels between the legend icon and the text next to it. Legend items that draw an icon (e.g. a visual representation of the graph) and text (e.g. the name of the graph) will use this space by default.

void QCPLegend::setSelectableParts ( const SelectableParts & selectable )

Sets whether the user can (de-)select the parts in selectable by clicking on the QCustomPlot surface. (When QCustomPlot::setInteractions contains iSelectLegend.)

However, even when selectable is set to a value not allowing the selection of a specific part, it is still possible to set the selection of this part manually, by calling setSelectedParts directly.

See also: SelectablePart, setSelectedParts

void QCPLegend::setSelectedBorderPen ( const QPen & pen )

When the legend box is selected, this pen is used to draw the border instead of the normal pen set via setBorderPen.

See also: setSelectedParts, setSelectableParts, setSelectedBrush

void QCPLegend::setSelectedBrush ( const QBrush & brush )

When the legend box is selected, this brush is used to draw the legend background instead of the normal brush set via setBrush.

See also: setSelectedParts, setSelectableParts, setSelectedBorderPen

void QCPLegend::setSelectedFont ( const QFont & font )

Sets the default font that is used by legend items when they are selected.

This function will also set font on all already existing legend items.

See also: setFont, QCPAbstractLegendItem::setSelectedFont

void QCPLegend::setSelectedIconBorderPen ( const QPen & pen )

Sets the pen legend items will use to draw their icon borders, when they are selected.

See also: setSelectedParts, setSelectableParts, setSelectedFont

void QCPLegend::setSelectedParts ( const SelectableParts & selected )

Sets the selected state of the respective legend parts described by SelectablePart. When a part is selected, it uses a different pen/font and brush. If some legend items are selected and selected doesn't contain spItems, those items become deselected.

The entire selection mechanism is handled automatically when QCustomPlot::setInteractions contains iSelectLegend. You only need to call this function when you wish to change the selection state manually.

This function can change the selection state of a part even when setSelectableParts was set to a value that actually excludes the part.

emits the selectionChanged signal when selected is different from the previous selection state.

Note that it doesn't make sense to set the selected state spItems here when it wasn't set before, because there's no way to specify which exact items to newly select. Do this by calling QCPAbstractLegendItem::setSelected directly on the legend item you wish to select.

See also: SelectablePart, setSelectableParts, selectTest, setSelectedBorderPen, setSelectedIconBorderPen, setSelectedBrush, setSelectedFont

void QCPLegend::setSelectedTextColor ( const QColor & color )

Sets the default text color that is used by legend items when they are selected.

This function will also set color on all already existing legend items.

See also: setTextColor, QCPAbstractLegendItem::setSelectedTextColor

void QCPLegend::setTextColor ( const QColor & color )

Sets the default color of legend text. Legend items that draw text (e.g. the name of a graph) will use this color by default. However, a different colors can be specified on a per-item-basis by accessing the specific legend item.

This function will also set color on all already existing legend items.

See also: QCPAbstractLegendItem::setTextColor

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

Public Types

Signals

Public Member Functions

Protected Member Functions

Protected Attributes

Friends

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation