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

Yash001 · wrote on 6 Jun 2018, 18:12

I wanted to open Slash screen before opening our Software and One Dialog box after complete opening of the software.

I have second screen is connected with Laptop. My Visual studio is opened into second screen, whenever I run the code at that time software is open into second screen but the dialog box and SplashScreen is open into the First screen.

how can I set something like both should open wherever the Software is open.
if the software is open into the First screen then I wanted to both dialog and slash screen both should open into the First screen. if the software open into second screen then both should open into second screen.

Here I attach small portion of the code which i wrote for dialog.

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

mrjj · wrote on 6 Jun 2018, 18:26

Hi
Is parent set ?
Normally it opens where ever parent is.

what do you give as paramter for ShowDataRecoveryInformDialog?

Yash001 · 6 Jun 2018, 19:08

Yes I set the parent as m_mainWindow.
/**********************MainWindow/
class MainWindow : public QMainWindow {
Public :
void CreateUI();
private:
MainWindowUI *ui;
};

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),
ui(new MainWindowUI(this))
{
ui->CreateUI();
}

/MainWindowUI*/

class MainWindowUI : public QObject {
MainWindow *m_mainWidnow;
};
void MainWindowUI::CreateUI() {
CreateCentralWidget();
}

void MainWindowUI::CreateCentralWidget(){
ShowDataRecoveryInformDialog (m_mainWidnow);
}

mrjj · wrote on 6 Jun 2018, 19:08

hi
and m_mainWidnow has a value at that point in time ?
To be sure please try

void MainWindowUI::CreateCentralWidget(){
qDebug() << "parent = " << m_mainWidnow;
ShowDataRecoveryInformDialog (m_mainWidnow);
}

Im using 2 monitors at work and it always open on top of parent with no extra effort on my part.

Yash001 · wrote on 6 Jun 2018, 19:25

yes m_mainWindow has value.

I try another thing into ShowDataRecoveryInformDialog Funcation.
Instead of the passing parent as argument. I set the parent with help of setParent property it is work.

Thank you for Help @mrrj

Yash001 · 6 Jun 2018, 19:37

in addition, I try like
QDialog* dialog = OBJ_NAME(new QDialog(m_mainWindow, Qt::SplashScreen), "notes-dialog");
It is also create the same issue.

only setParent is work fine.

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?