QwtPlotScaleEventDispatcher Class Reference

Event filter for parasitic plots, handling axis interactions. More...

#include <qwt_plot_scale_event_dispatcher.h>

Inheritance diagram for QwtPlotScaleEventDispatcher:

Classes
class	PrivateData

Public Slots
void	updateCache ()
	Update cache.
void	setEnable (bool on=true)
	Set enabled state.

Public Member Functions
	QwtPlotScaleEventDispatcher (QwtPlot *plot, QObject *par=nullptr)
	Constructor.
	~QwtPlotScaleEventDispatcher () override
	Destructor.
bool	isEnable () const
	Check if enabled.

Static Public Member Functions
static QwtAxisId	findAxisIdByScaleWidget (const QwtPlot *plot, const QwtScaleWidget *scaleWidget)
	Find axis ID corresponding to QwtScaleWidget.

Protected Member Functions
virtual bool	eventFilter (QObject *obj, QEvent *e) override
void	rebuildCache ()
	Rebuild all cache data; must be called when a new parasite plot is added to cache the plot's axes.
virtual bool	handleMousePress (QwtPlot *bindPlot, QMouseEvent *e)
virtual bool	handleMouseMove (QwtPlot *bindPlot, QMouseEvent *e)
virtual bool	handleMouseRelease (QwtPlot *bindPlot, QMouseEvent *e)
virtual bool	handleWheelEvent (QwtPlot *bindPlot, QWheelEvent *e)
QwtScaleWidget *	findTargetOnScale (const QPoint &pos)

Detailed Description

Event filter for parasitic plots, handling axis interactions.

Since parasitic plots are child windows of host plots, events from multiple parasitic plots' widgets cannot be passed to other parasitic plots' widgets. For example, with 2 parasitic plots, their axis areas overlap. The top-level parasitic plot's axis widget has the same size as the lower-level and host plot's axis widgets. Only the top-level parasitic axis widget receives events. Even if ignored, events only fall to the current parasitic plot window, not the next level's axis widget. This class is designed to solve this problem. Axis actions are executed here as event handlers rather than event propagators.

Constructor & Destructor Documentation

QwtPlotScaleEventDispatcher()

QwtPlotScaleEventDispatcher::QwtPlotScaleEventDispatcher ( QwtPlot *  plot, QObject *  par = nullptr  )

explicit

Constructor.

Parameters

[in]	plot	Plot widget
[in]	par	Parent object

Destructor

Member Function Documentation

findAxisIdByScaleWidget()

QwtAxisId QwtPlotScaleEventDispatcher::findAxisIdByScaleWidget ( const QwtPlot *  plot, const QwtScaleWidget *  scaleWidget  )

static

Find axis ID corresponding to QwtScaleWidget.

Parameters

[in]	plot	QwtPlot pointer
[in]	scaleWidget	QwtScaleWidget to find

Returns

Axis ID, returns QwtAxis::AxisPositions if not found

isEnable()

bool QwtPlotScaleEventDispatcher::isEnable

(

)

const

Check if enabled.

Returns

True if enabled

setEnable

void QwtPlotScaleEventDispatcher::setEnable ( bool  on = true )

slot

Set enabled state.

Parameters

[in]

on

Enable/disable

updateCache

void QwtPlotScaleEventDispatcher::updateCache ( )

slot

Update cache.

Update cache, rebuild if necessary.

Called when cache is dirty or needs refresh.

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

• /home/runner/work/QWT/QWT/src/plot/qwt_plot_scale_event_dispatcher.h
• /home/runner/work/QWT/QWT/src/plot/qwt_plot_scale_event_dispatcher.cpp