QPaintWidget Class Reference

Represent area where actual canvas painting is performed.

Qt defines paintEvent virtual method where all painting should be done. At this moment QPainter object is created which then used in TVirtualPadPainter API.

Definition at line 21 of file QPaintWidget.h.

Signals
void	CanvasStatusEvent (const QString &msg)

Public Member Functions
	QPaintWidget (QWidget *parent=nullptr)
	Constructor.
virtual	~QPaintWidget ()
	Destructor.
TCanvas *	getCanvas ()
	returns canvas shown in the widget
QPainter *	getPainter () const
void	SetCanvas (TCanvas *canv)
void	SetShowToolTip (bool on)

Protected Member Functions
void	enterEvent (QEnterEvent *event) override
	Enter event handler.
bool	event (QEvent *event) override
	Generic event handler.
void	leaveEvent (QEvent *event) override
	Leave event handler.
void	mouseDoubleClickEvent (QMouseEvent *event) override
	Mouse double click event handler.
void	mouseMoveEvent (QMouseEvent *event) override
	Mouse move event handler.
void	mousePressEvent (QMouseEvent *event) override
	Mouse press event handler.
void	mouseReleaseEvent (QMouseEvent *event) override
	Mouse release event handler.
void	paintEvent (QPaintEvent *event) override
	Paint event handler.
void	resizeEvent (QResizeEvent *event) override
	Resize event handler.
QPoint	scaledMousePoint (QMouseEvent *event)
	Convert mouse event position to canvas coordinates.
double	scaledPosition (int p)
void	wheelEvent (QWheelEvent *event) override
	Wheel event handler.

Protected Attributes
TCanvas *	fCanvas = nullptr
	canvas shown in the widget
bool	fMaskDoubleClick = false
QPainter *	fPainter = nullptr
	temporary painter created inside paintEvent handler
double	fQtScalingfactor = 1.
bool	fShowEventStatus = true
bool	fShowToolTip = false

#include </github/home/ROOT-CI/src/gui/qt6canvas/src/QPaintWidget.h>

Inheritance diagram for QPaintWidget:

Constructor & Destructor Documentation

QPaintWidget()

QPaintWidget::QPaintWidget

(

QWidget *

parent = nullptr

)

Constructor.

Definition at line 44 of file QPaintWidget.cpp.

~QPaintWidget()

QPaintWidget::~QPaintWidget ( )

virtual

Destructor.

Definition at line 66 of file QPaintWidget.cpp.

Member Function Documentation

CanvasStatusEvent

void QPaintWidget::CanvasStatusEvent ( const QString & msg )

signal

enterEvent()

void QPaintWidget::enterEvent ( QEnterEvent * event )

overrideprotected

Enter event handler.

Definition at line 289 of file QPaintWidget.cpp.

event()

bool QPaintWidget::event ( QEvent * event )

overrideprotected

Generic event handler.

Used to handle tooltip event - if configured

Definition at line 85 of file QPaintWidget.cpp.

getCanvas()

TCanvas * QPaintWidget::getCanvas ( )

inline

returns canvas shown in the widget

Definition at line 30 of file QPaintWidget.h.

getPainter()

QPainter * QPaintWidget::getPainter ( ) const

inline

Definition at line 32 of file QPaintWidget.h.

leaveEvent()

void QPaintWidget::leaveEvent ( QEvent * event )

overrideprotected

Leave event handler.

Definition at line 299 of file QPaintWidget.cpp.

mouseDoubleClickEvent()

void QPaintWidget::mouseDoubleClickEvent ( QMouseEvent * event )

overrideprotected

Mouse double click event handler.

Definition at line 243 of file QPaintWidget.cpp.

mouseMoveEvent()

void QPaintWidget::mouseMoveEvent ( QMouseEvent * event )

overrideprotected

Mouse move event handler.

Definition at line 181 of file QPaintWidget.cpp.

mousePressEvent()

void QPaintWidget::mousePressEvent ( QMouseEvent * event )

overrideprotected

Mouse press event handler.

Definition at line 152 of file QPaintWidget.cpp.

mouseReleaseEvent()

void QPaintWidget::mouseReleaseEvent ( QMouseEvent * event )

overrideprotected

Mouse release event handler.

Definition at line 217 of file QPaintWidget.cpp.

paintEvent()

void QPaintWidget::paintEvent ( QPaintEvent * event )

overrideprotected

Paint event handler.

Only inside this method painting on QWidget is allowed For this temporary QPainter object is created and assigned to fPainter Any attempt to paint outside this method will be blocked - while fPainter will be 0

Definition at line 133 of file QPaintWidget.cpp.

resizeEvent()

void QPaintWidget::resizeEvent ( QResizeEvent * event )

overrideprotected

Resize event handler.

Definition at line 117 of file QPaintWidget.cpp.

scaledMousePoint()

QPoint QPaintWidget::scaledMousePoint ( QMouseEvent * event )

protected

Convert mouse event position to canvas coordinates.

Definition at line 73 of file QPaintWidget.cpp.

scaledPosition()

double QPaintWidget::scaledPosition ( int p )

inlineprotected

Definition at line 56 of file QPaintWidget.h.

SetCanvas()

void QPaintWidget::SetCanvas ( TCanvas * canv )

inline

Definition at line 34 of file QPaintWidget.h.

SetShowToolTip()

void QPaintWidget::SetShowToolTip ( bool on )

inline

Definition at line 36 of file QPaintWidget.h.

wheelEvent()

void QPaintWidget::wheelEvent ( QWheelEvent * event )

overrideprotected

Wheel event handler.

Definition at line 271 of file QPaintWidget.cpp.

Member Data Documentation

fCanvas

TCanvas* QPaintWidget::fCanvas = nullptr

protected

canvas shown in the widget

Definition at line 60 of file QPaintWidget.h.

fMaskDoubleClick

bool QPaintWidget::fMaskDoubleClick = false

protected

Definition at line 66 of file QPaintWidget.h.

fPainter

QPainter* QPaintWidget::fPainter = nullptr

protected

temporary painter created inside paintEvent handler

Definition at line 62 of file QPaintWidget.h.

fQtScalingfactor

double QPaintWidget::fQtScalingfactor = 1.

protected

Definition at line 64 of file QPaintWidget.h.

fShowEventStatus

bool QPaintWidget::fShowEventStatus = true

protected

Definition at line 67 of file QPaintWidget.h.

fShowToolTip

bool QPaintWidget::fShowToolTip = false

protected

Definition at line 68 of file QPaintWidget.h.