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

Yash001

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

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

what do you give as paramter for ShowDataRecoveryInformDialog?

Yash001

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

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

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

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

Hi,

Why not use this rather than m_mainWindow ?

mrjj

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

in your dialog so you forward parent to base?

Yash001

@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

Can you show your complete code for your MainWindow ?

It looks like you are modifying the wrong file.

Yash001

@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

@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

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

@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

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

Yash001

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

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

Yash001

@mrjj May be. It is qt default function.

mrjj

@Yash001
yeah its a windows flag.

Yash001

@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?