Hi Gianmarco,
if I understand the code correctly, you depend on signals being fired from a
push button. The Home class doesn't look like a button, so it will never
receive mouse button events.
That's probably why the qDebug() doesn't see any.
You need to intercept the events of that push button:
Unless already enabled, please set the Qt::WA_AcceptTouchEvents attribute on
the button. Install an event filter on the button and qDebug() all incoming
events.
Watch out for TouchBegin, TouchUpdate, TouchEnd. You could intercept and
interpret those and emit an own signal, if the press & release signals don't
get fired correctly.
Brgds
Axel
________________________________
Von: g.scarpe...@u-tech.it <g.scarpe...@u-tech.it>
Gesendet: Donnerstag, 16. Februar 2023 12:41
An: Axel Spoerl <axel.spo...@qt.io>
Cc: interest@qt-project.org <interest@qt-project.org>
Betreff: Re:AW: [Interest] The touch screen events are block after deleteLater
function
Hi Axel ,
Using the qDebug I see and the code below, QEvent::MouseButtonPress never fires
if I press the touch:
----------Home.cpp-------------
bool Home::event ( QEvent * curEvent ) {
if ( curEvent -> type ( ) == QEvent::MouseButtonPress ) {
qDebug ( ) << "Click!" ;
}
return QWidget::event ( curEvent ) ;
}
------------Home.h--------------
...
private:
bool event ( QEvent * curEvent ) override ;
...
I also tried using the setFocus and update function. But I don't solve the
problem. In this way:
void Home::closeAvvioLavaggio()
{
disconnect(window,&Lavaggio::closeLavaggio,this,&Home::closeAvvioLavaggio);
window->deleteLater();
window = nullptr ;
this->setFocus ( ) ;
this->update ( ) ;
}
do you have any suggestion?
Thanks,
Gianmarco
[http://www.marketingaziende.it/sites/default/files/aziende/foto/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
************************
Attenzione: Le informazioni contenute in questo messaggio di posta elettronica
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Qualora doveste ricevere questo messaggio per errore, Vi notifichiamo con la
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*****************************************************
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and/or privileged material, is legally privileged and intended solely for the
recipient. Access to this e-mail by anyone else, use it for any purpose, store,
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strictly prohibited and illegal. If you are not the intended recipient(s),
please do not read this e-mail, delete this message and any attachments from
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*****************************************************
>From "Axel Spoerl" axel.spo...@qt.io
To "interest@qt-project.org" interest@qt-project.org,"g.scarpe...@u-tech.it"
g.scarpe...@u-tech.it
Cc
Date Thu, 16 Feb 2023 10:39:35 +0000
Subject AW: [Interest] The touch screen events are block after deleteLater
function
It's difficult to analyze the problem without seeing the whole code, especially
the graphics layout.
The deleteLater-instruction will cause the object to be deleted, when events
are being processed.
The error could be another widget acquiring focus or overlaying the button,
before the button is released.
When the finger is released, the touch gesture can no longer be attributed to
the button and the release signal is not emitted.
That would explain why it happens on the touch screen, but not with the mouse.
A possible workaround is to connect to the button's pressed signal.
In order to find the issue, you have to implement a helper, listening to all
relevant signals and qDebug() the result.
The screen freeze could be caused by accessing a deleted object, but also by a
blocking infinite loop. Throwing qDebugs in the code will shed more light on
this.
________________________________
Von: Interest <interest-boun...@qt-project.org> im Auftrag von
g.scarpe...@u-tech.it <g.scarpe...@u-tech.it>
Gesendet: Donnerstag, 16. Februar 2023 10:53
An: interest@qt-project.org <interest@qt-project.org>
Betreff: [Interest] The touch screen events are block after deleteLater function
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 ( ) ;
}
[http://www.marketingaziende.it/sites/default/files/aziende/foto/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
************************
Attenzione: Le informazioni contenute in questo messaggio di posta elettronica
sono private e confidenziali, riservate solo all'attenzione del destinatario.
Qualora doveste ricevere questo messaggio per errore, Vi notifichiamo con la
presente che ogni diffusione, riproduzione, distribuzione o utilizzo del
presente messaggio è altamente proibita. Siete pregati di informare il mittente
con un messaggio di risposta e cancellare immediatamente il presente messaggio
ed il suo eventuale contenuto, senza copiarlo o aprirlo.
*****************************************************
This e-mail and any file transmitted with it, which may contain confidential
and/or privileged material, is legally privileged and intended solely for the
recipient. Access to this e-mail by anyone else, use it for any purpose, store,
copy, disclose the contents to any other person totally or partially is
strictly prohibited and illegal. If you are not the intended recipient(s),
please do not read this e-mail, delete this message and any attachments from
your system and contact the sender by reply e-mail or by telephone.
*****************************************************
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