How to open dialog box on top of the application if two screen are connected?

SGaist · 6 Jun 2018, 19:47

Hi,

Why not use this rather than m_mainWindow ?

mrjj · 6 Jun 2018, 19:55

@Yash001
and you have like
ShowDataRecoveryInformDialog::ShowDataRecoveryInformDialog(QWidget *parent) : QDialog (parent)

in your dialog so you forward parent to base?

Yash001 · S SGaist 6 Jun 2018, 19:37

@SGaist I already try it but it is not work. i got this error.

Severity Code Description Project File Line Suppression State
Error C2664 'void QWidget::setParent(QWidget *,Qt::WindowFlags)': cannot convert argument 1 from 'MainWindowUI *const ' to 'QWidget *'

SGaist · 6 Jun 2018, 19:58

Can you show your complete code for your MainWindow ?

It looks like you are modifying the wrong file.

Yash001 · M mrjj 6 Jun 2018, 19:37

@mrjj
m_mainWindow is my main Object, it is create the whole application on GUI side by calling createUI funcation.

yes i was try to set the parent as main object.

I make this change and code work perfectly fine. and got the output, which I want.

void MainWindowUI::ShowDataRecoveryInformDialog() {
QDialog dialog = new QDialog( );

dialog->setWindowFlags(Qt::SplashScreen);
dialog->setParent(m_mainWindow);

auto dialogLay = new QVBoxLayout(dialog);
dialogLay->addWidget(PBT("button 1"));
dialogLay->addWidget(PBT("button 2"));
dialog->exec();
}

Yash001 · S SGaist 6 Jun 2018, 19:50

@SGaist by using setParent and set WindowFlag property. i am able to open dialog on top of the Application.

dialog->setWindowFlags(Qt::SplashScreen);
dialog->setParent(m_mainWindow);

Thank you Sir for your help.

mrjj · 6 Jun 2018, 20:02

Ok should be the same as, or else im very wondering

void MainWindowUI::ShowDataRecoveryInformDialog() {
QDialog dialog = new QDialog( m_mainWindow);
dialog->setWindowFlags(Qt::SplashScreen);
auto dialogLay = new QVBoxLayout(dialog);
dialogLay->addWidget(PBT("button 1"));
dialogLay->addWidget(PBT("button 2"));
dialog->exec();
}

Yash001 · 6 Jun 2018, 20:04

@mrjj

I don't know. what is different but now it is work. i did not make any change except setting the property

before:
QDialog *dialog = new QDialog(parent, Qt::SplashScreen);

now :

QDialog* dialog = new QDialog();
dialog->setWindowFlags(Qt::SplashScreen);
dialog->setParent(m_mainWindow);

mrjj · wrote on 6 Jun 2018, 20:04

@Yash001
ok, im not sure either. seems the same :)

Yash001 · 6 Jun 2018, 20:08

I found the different.

it is work fine.

dialog->setWindowFlags(Qt::SplashScreen);
dialog->setParent(m_mainWindow);

it is not work.

dialog->setParent(m_mainWindow);
dialog->setWindowFlags(Qt::SplashScreen);

mrjj · 6 Jun 2018, 20:09

@Yash001
Ok so Qt::SplashScreen does something with parent.

Yash001 · 6 Jun 2018, 20:19

@mrjj May be. It is qt default function.

mrjj · 6 Jun 2018, 21:27

@Yash001
yeah its a windows flag.

Yash001 · 6 Jun 2018, 21:38

@mrjj

dialog->setWindowFlags(Qt::SplashScreen);
dialog->setParent(m_mainWindow);
In this case I got dialog box on top of the screen but it is make another issue

dialog->exec(); is not work as per expectation. without responding the to Dialog user access the other page also.

In other word, user can access both screen Main application as well as Dialog box. how to block access on other widget until get response from the user in dialog box?

mrjj · wrote on 6 Jun 2018, 21:38

Hi
Im not 100% sure Qt::SplashScreen is compatiple with Qt::Dialog flag

Qt::SplashScreen 0x0000000e | Window Indicates that the window is a splash screen. This is the default type for QSplashScreen.

Normally used with QSplashScreen widget.

mrjj · wrote on 6 Jun 2018, 21:42

maybe try with
dialog->setWindowFlags(Qt::Dialog | Qt::SplashScreen);

Yash001 · 6 Jun 2018, 21:55

@mrjj it is create previous issue.

mrjj · wrote on 6 Jun 2018, 21:55

@Yash001
but why you need Qt::SplashScreen ?
and modal dialog ?
cant you just use the dialog ?

JonB · wrote on 6 Jun 2018, 21:59

@Yash001
Similarly to @mrjj , have you considered using QSplashScreen (http://doc.qt.io/qt-5/qsplashscreen.html), maybe it doesn't have these problems?

Yash001 · 6 Jun 2018, 22:09

I am using Qt::SplashScreen because of I wanted show dialog on the top of all screen. This dialog is show whenever specific signal is generated from Hardware Connection. if hardware is connected with PC before opening our Software then dialog will open after Software Open. and control need to transfer on dialog box. (at this time user should not access any other page).

I have not idea what is model Dialog.