QwtPlotScaleEventDispatcher类 参考

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

#include <qwt_plot_scale_event_dispatcher.h>

类 QwtPlotScaleEventDispatcher 继承关系图:

类
class	PrivateData

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

Public 成员函数
	QwtPlotScaleEventDispatcher (QwtPlot *plot, QObject *par=nullptr)
	Constructor
	~QwtPlotScaleEventDispatcher () override
	Destructor
bool	isEnable () const
	Check if enabled

静态 Public 成员函数
static QwtAxisId	findAxisIdByScaleWidget (const QwtPlot *plot, const QwtScaleWidget *scaleWidget)
	Find axis ID corresponding to QwtScaleWidget

Protected 成员函数
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)

详细描述

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.

构造及析构函数说明

QwtPlotScaleEventDispatcher()

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

explicit

Constructor

参数

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

Destructor

成员函数说明

findAxisIdByScaleWidget()

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

static

Find axis ID corresponding to QwtScaleWidget

参数

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

返回

Axis ID, returns QwtAxis::AxisPositions if not found

isEnable()

bool QwtPlotScaleEventDispatcher::isEnable

(

)

const

Check if enabled

返回

True if enabled

setEnable

void QwtPlotScaleEventDispatcher::setEnable ( bool  on = true )

slot

Set enabled state

参数

[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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该类的文档由以下文件生成:

• /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