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Qt for Android sends MouseReleaseEvent after 1 second without releasing the screen after screen orientation changed

How to handle screen orientation change when progress dialog and background thread active?How do I disable orientation change on Android?How do I change screen orientation in the Android emulator?Sending Email in Android using JavaMail API without using the default/built-in appHow to send an object from one Android Activity to another using Intents?getting the screen density programmatically in android?Get screen width and height in AndroidC++/Qt - Open Dialog from MainWindow -Error LNK2019 - LNK2001: unresolved external symbolQt mousePressEventQt mouseEvent and widget

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1

If I implement in a simple Qt Widget application for Android MousePressEvent() and MouseReleaseEvent() everything seems to work properly first.
If I change the orientation of the screen (e.g. from Portrait to Landscape) the MousePressEvent is still triggered as expected, but the MouseReleaseEvent() is triggered automatically after about 1 second, even if it is not released.
This can be prevented if I move on the touchscreen with less than the second.
With this behavior, even the guesture events won't work anymore after I changed the screen orientation at least one time.
I also receive the following warning in debugger:

W libtest5.so: QMetaObject::invokeMethod: No such method Widget::inputMethodQuery(Qt::InputMethodQuery,QVariant)

I didn't find any help on stackoverflow so far. I tested on different Qt versions up to 5.12 and different Android devices

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QMouseEvent>

MainWindow::MainWindow(QWidget *parent) :
 QMainWindow(parent),
 ui(new Ui::MainWindow)

 ui->setupUi(this);


MainWindow::~MainWindow()

 delete ui;


void MainWindow::mousePressEvent(QMouseEvent *event)

 qDebug() << "press" << event->buttons();


void MainWindow::mouseReleaseEvent(QMouseEvent *event)

 qDebug() << "release" << event->buttons();


void MainWindow::mouseMoveEvent(QMouseEvent *event)

 qDebug() << "move"<< event->buttons();

I expect, that the mouseReleaseEvent is only triggered if I lift my fingers from the screen. Again, this happens only if I changed the orientation of the screen at least once.

android qt events widget

share|improve this question

edited Mar 24 at 19:19

TrebledJ

4,82041434

asked Mar 24 at 18:50

Harald KörtgeHarald Körtge

61

add a comment | 

1

If I implement in a simple Qt Widget application for Android MousePressEvent() and MouseReleaseEvent() everything seems to work properly first.
If I change the orientation of the screen (e.g. from Portrait to Landscape) the MousePressEvent is still triggered as expected, but the MouseReleaseEvent() is triggered automatically after about 1 second, even if it is not released.
This can be prevented if I move on the touchscreen with less than the second.
With this behavior, even the guesture events won't work anymore after I changed the screen orientation at least one time.
I also receive the following warning in debugger:

W libtest5.so: QMetaObject::invokeMethod: No such method Widget::inputMethodQuery(Qt::InputMethodQuery,QVariant)

I didn't find any help on stackoverflow so far. I tested on different Qt versions up to 5.12 and different Android devices

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QMouseEvent>

MainWindow::MainWindow(QWidget *parent) :
 QMainWindow(parent),
 ui(new Ui::MainWindow)

 ui->setupUi(this);


MainWindow::~MainWindow()

 delete ui;


void MainWindow::mousePressEvent(QMouseEvent *event)

 qDebug() << "press" << event->buttons();


void MainWindow::mouseReleaseEvent(QMouseEvent *event)

 qDebug() << "release" << event->buttons();


void MainWindow::mouseMoveEvent(QMouseEvent *event)

 qDebug() << "move"<< event->buttons();

I expect, that the mouseReleaseEvent is only triggered if I lift my fingers from the screen. Again, this happens only if I changed the orientation of the screen at least once.

android qt events widget

share|improve this question

edited Mar 24 at 19:19

TrebledJ

4,82041434

asked Mar 24 at 18:50

Harald KörtgeHarald Körtge

61

add a comment | 

If I implement in a simple Qt Widget application for Android MousePressEvent() and MouseReleaseEvent() everything seems to work properly first.
If I change the orientation of the screen (e.g. from Portrait to Landscape) the MousePressEvent is still triggered as expected, but the MouseReleaseEvent() is triggered automatically after about 1 second, even if it is not released.
This can be prevented if I move on the touchscreen with less than the second.
With this behavior, even the guesture events won't work anymore after I changed the screen orientation at least one time.
I also receive the following warning in debugger:

W libtest5.so: QMetaObject::invokeMethod: No such method Widget::inputMethodQuery(Qt::InputMethodQuery,QVariant)

I didn't find any help on stackoverflow so far. I tested on different Qt versions up to 5.12 and different Android devices

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QMouseEvent>

MainWindow::MainWindow(QWidget *parent) :
 QMainWindow(parent),
 ui(new Ui::MainWindow)

 ui->setupUi(this);


MainWindow::~MainWindow()

 delete ui;


void MainWindow::mousePressEvent(QMouseEvent *event)

 qDebug() << "press" << event->buttons();


void MainWindow::mouseReleaseEvent(QMouseEvent *event)

 qDebug() << "release" << event->buttons();


void MainWindow::mouseMoveEvent(QMouseEvent *event)

 qDebug() << "move"<< event->buttons();

I expect, that the mouseReleaseEvent is only triggered if I lift my fingers from the screen. Again, this happens only if I changed the orientation of the screen at least once.

android qt events widget

share|improve this question

edited Mar 24 at 19:19

TrebledJ

4,82041434

asked Mar 24 at 18:50

Harald KörtgeHarald Körtge

61

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QMouseEvent>

MainWindow::MainWindow(QWidget *parent) :
 QMainWindow(parent),
 ui(new Ui::MainWindow)

 ui->setupUi(this);


MainWindow::~MainWindow()

 delete ui;


void MainWindow::mousePressEvent(QMouseEvent *event)

 qDebug() << "press" << event->buttons();


void MainWindow::mouseReleaseEvent(QMouseEvent *event)

 qDebug() << "release" << event->buttons();


void MainWindow::mouseMoveEvent(QMouseEvent *event)

 qDebug() << "move"<< event->buttons();

android qt events widget

android qt events widget

share|improve this question

edited Mar 24 at 19:19

TrebledJ

4,82041434

asked Mar 24 at 18:50

Harald KörtgeHarald Körtge

61

share|improve this question

edited Mar 24 at 19:19

TrebledJ

4,82041434

asked Mar 24 at 18:50

Harald KörtgeHarald Körtge

61

edited Mar 24 at 19:19

TrebledJ

4,82041434

edited Mar 24 at 19:19

TrebledJ

4,82041434

asked Mar 24 at 18:50

Harald KörtgeHarald Körtge

61

asked Mar 24 at 18:50

Harald KörtgeHarald Körtge

61