Show parent window

[Qt Coder]

Hello All,


I have developed one application,in which I m using 4-5 different screens to navigate.

Now from Mainwindow screen I have activated the another screen,so my mainwindow is now hidden .But in this new screen on one button click event I need to show the mainwindow screen .

How to acheive it???

The code I m using is as follows

in MainWindow.cpp

void MainWindow::f_Open_screen_al()
{	
	screen_al->show();
	screen_al->activateWindow();
}
 
void MainWindow::ShowMainWindow()
{	
	this->activateWindow();
}

void MainWindow::f_Open_screen_al()
{	
	screen_al->show();
	screen_al->activateWindow();
}

void MainWindow::ShowMainWindow()
{	
	this->activateWindow();
}

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and in screen_al.cpp

connect(ui.pushbutton, SIGNAL(clicked()), this->parent(), SLOT(ShowMainWindow()));

connect(ui.pushbutton, SIGNAL(clicked()), this->parent(), SLOT(ShowMainWindow()));

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But No mainwindow is displayed.....

Pls help

[spirit]

try this

void MainWindow::ShowMainWindow()
{
    raise();
    this->activateWindow();
}

void MainWindow::ShowMainWindow()
{
    raise();
    this->activateWindow();
}

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[Qt Coder]

I tried this code

void MainWindow::ShowMainWindow()
{   
    QMessageBox::information(this,"ShowMainWindow","ShowMainWindow");
    raise();
    this->activateWindow();
}

void MainWindow::ShowMainWindow()
{   
    QMessageBox::information(this,"ShowMainWindow","ShowMainWindow");
    raise();
    this->activateWindow();
}

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The QMessageBox is displayed but no child window is closed nor the mainwindow is displayed

For activating the mainWindow I used the code

ui.setupUi(this);

ui.setupUi(this);

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and in ui_mainwindow.h "this" is QMainWindow type

void setupUi(QMainWindow *MainWindow)

void setupUi(QMainWindow *MainWindow)

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what to do now?

[nish]

you said that your main window was hidden? if u called hide() then you should call show() in MainWindow::ShowMainWindow()

try it

void MainWindow::ShowMainWindow()
{   
    show();
}

void MainWindow::ShowMainWindow()
{   
    show();
}

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[Qt Coder]

I want to call one of my mainwindow function on close event of child window ,how to connect this signal..


Previously I tried

connect(this,SIGNAL(destroyed()),this->parent(),SLOT(f_max()));

connect(this,SIGNAL(destroyed()),this->parent(),SLOT(f_max()));

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but as I m closing a child window using

this->close()

this->close()

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so "destroyed event "is not getting triggered ...

[nish]

try these

this->close();
MyMainWindow*p=(MyMainWindow*)this->parent();
p->f_max();

this->close();
MyMainWindow*p=(MyMainWindow*)this->parent();
p->f_max();

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or

void child::closeEvent(QCloseEvent*)
{
 
  MyMainWindow*p=(MyMainWindow*)this->parent();
  p->f_max();
 
}

void child::closeEvent(QCloseEvent*)
{

  MyMainWindow*p=(MyMainWindow*)this->parent();
  p->f_max();

}

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or

MyMainWindow*p=(MyMainWindow*)this->parent();
connect(this,SIGNAL(destroyed()),p,SLOT(f_max()));

MyMainWindow*p=(MyMainWindow*)this->parent();
connect(this,SIGNAL(destroyed()),p,SLOT(f_max()));

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[Qt Coder]

MyMainWindow*p=(MyMainWindow*)this->parent();

MyMainWindow*p=(MyMainWindow*)this->parent();

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In above code ,In place of "MyMainWindow" what should I put?

in mainwindow .h class is decraled as..

class MainWindow : public QMainWindow
{
}

class MainWindow : public QMainWindow
{
}

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cant we connect a close event to parent window function???

I just need to detect the close event of this child window and connect my f_max() function to that signal

[nish]

put MainWindow instead of MyMainWindow and use the closeEvent code i showed u