[Interest] The touch screen events are block after deleteLater function
g.scarpelli at u-tech.it
g.scarpelli at u-tech.it
Thu Feb 16 10:53:06 CET 2023
Hi,
I am development my application with the qt 5.15 (c++ code) .The my application is implement using objects are child of the QWidget class. Every time that I open a child class connect the closing signal at the slot to parent class to delete the object child :
PARENT CLASS :
windows = new ChildClass ( ) ;
connect (childClass,&childClass::signalClose,parentClass,&parentClass::closeChildClass);
windows-> showFullScreen ( ) ;
CHILD CLASS :
emit signalClose ( ) ;
PARENT CLASS :
slot closeChildClass :
windows-> deleteLater ( ) ;
I have Implement a application to execute this simple code, if I can keep press the touch screen with my finger when the application execute the windows-> deleteLater ( ) instruction, the touch screen is freeze, I don't can to press the button of the my application with the display touch. While if I connect the mouse I can press the button correctly, but if to press button with the finger not spring the &QPushButton::released event. If I can to active &QPushButton::released event with mouse, means that my application is not block and the button is enabled. If I comment the windows-> deleteLater ( ) instruction I don't this problem. Afer that problem occurred if I restart the application it work correctly, without power off the pc, so the display touch work correcty.
Can you help me ?
This problem blocking the release the my application !
Thanks
----------------------- home.h -------------------------`
#ifndef HOME_H
#define HOME_H
#include <QWidget>
//---------------------
//INCLUDE VALIDI PER TUTTE LE FINESTRE
#include <QScreen>
#include <QDebug>
#include <QTimer>
#include <QDateTime>
#include <QFile>
#include <QJsonDocument>
#include <QJsonValue>
#include <QJsonArray>
#include <QJsonObject>
#include <QFileInfo>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>
#include <QMessageLogContext>
#include <QLoggingCategory>
//---------------------
#include "lavaggio.h"
#include <QtGui>
#include <QPainter>
#include <QStyleOption>
#include <QDir>
namespace Ui {
class Home;
}
class Home : public QWidget
{
Q_OBJECT
public:
explicit Home ( Init *tmp_init = nullptr, QWidget *parent = nullptr ) ;
~Home();
protected:
void paintEvent(QPaintEvent *)
{
QStyleOption opt;
opt.init(this);
QPainter p(this);
style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
}
signals :
public slots :
void openAvvioLavaggio();
void closeAvvioLavaggio();
private slots:
private :
Ui::Home *ui ;
Lavaggio *window = nullptr ;
} ;
#endif // HOME_H
----------------------- home.cpp -------------------------
Home::Home (Init * tmp_init , QWidget * parent ) :
QWidget ( parent ) ,
ui ( new Ui::Home )
{
qDebug ( ) << "Load Home" ;
ui->setupUi(this);
this -> setWindowFlags ( Qt::Window | Qt::CustomizeWindowHint ) ;
connect(ui->btn_avvio_lavaggio, &QPushButton::released, this, &Home::openAvvioLavaggio);
}
void Home::openAvvioLavaggio(){
qDebug ( ) <<"Start 'wash'.";
// creo istanza oggetto finestra Avvio Lavaggio
window= new Lavaggio();
//collego slot-signal all'eventi di chiusura del widget
// Note : time to execute this instruction about 500ms
connect(window,&Lavaggio::closeLavaggio,this,&Home::closeAvvioLavaggio);
//visualizzo schermata Avvio Lavaggio
window->showFullScreen();
// Remove the 'stays on top hint'
this -> setWindowFlags ( Qt::Window | Qt::CustomizeWindowHint ) ;
}
void Home::closeAvvioLavaggio()
{
qDebug ( ) <<"closeAvvioLavaggio";
//scollego slot-signal all'eventi di chiusura del widget
disconnect(window,&Lavaggio::closeLavaggio,this,&Home::closeAvvioLavaggio);
window->deleteLater();
window = nullptr ;
}
----------------------- lavaggio.h -------------------------
#ifndef LAVAGGIO_H
#define LAVAGGIO_H
#include <QWidget>
//---------------------
//INCLUDE VALIDI PER TUTTE LE FINESTRE
#include <QScreen>
#include <QDebug>
#include <QTimer>
#include <QDateTime>
#include <QProcess>
#include <QFile>
#include <QJsonDocument>
#include <QJsonValue>
#include <QJsonArray>
#include <QJsonObject>
#include <QFileInfo>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>
#include <QSqlRecord>
#include <QtGui>
#include <QPainter>
#include <QStyleOption>
//---------------------
#include "pagamentolavaggioasciugatura.h"
#include "messagebox.h"
#include "ChooseTypeWash.h"
#include "laundrysettings.h"
#include "laundryapp.h"
namespace Ui {
class Lavaggio;
}
class Lavaggio : public QWidget
{
Q_OBJECT
public:
explicit Lavaggio( QWidget *parent = nullptr);
~Lavaggio();
protected:
void paintEvent(QPaintEvent *)
{
QStyleOption opt;
opt.init(this);
QPainter p(this);
style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
}
signals :
// Close the window
void closeLavaggio ( ) ;
private slots:
// Exit from screen
void exitWash ( ) ;
private:
Ui::Lavaggio *ui;
} ;
#endif // LAVAGGIO_H
----------------------- lavaggio.cpp -------------------------
Lavaggio::Lavaggio ( QWidget *parent ) :
QWidget(parent),
ui(new Ui::Lavaggio)
{
qDebug ( ) <<"Load Lavaggio";
//--------------------------------------
//CARICAMENTO GRAFICA
//avvio caricamento grafica
ui->setupUi(this);
// --------------------------------------
// PERSONALIZZAZIONE GRAFICA
// queste impostazioni grafiche devono valere per tutte le finestre
// per eliminare la toolbar
// Note: Time to execute this instruction about 500ms
this->setWindowFlags(Qt::Window | Qt::CustomizeWindowHint | Qt::WindowStaysOnTopHint );
connect(ui->btn_indietro, &QPushButton::released, this, &Lavaggio::exitWash);
}
void Lavaggio::exitWash ( ) {
qDebug ( ) <<"Check Exit wash" ;
qDebug ( ) << "Exit -> wash" ;
emit closeLavaggio ( ) ;
close ( ) ;
}
[microtechsrl_1486503464_F.png]
*-*-*-*-*-*-*-*-*-*-*-*-*
Dot. Gianmarco Scarpelli
Microtech Srl
Via Mameli, 94
53043 Chiusi (Si)
http://www.microtechsrl.net
Tel +39 0578 294621
Fax +39 0578 1900218
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