How to delete modeless dialog?

I want to create and show multiple dialog(or widget) on multiple user click.
so I written as:

Code:

---

void MainWindow::onIRSignalReport()
{
   ...
   SignalWindow *pSignalWindow = new SignalWindow();
   pSignalWindow->setSignalFile(fileName);
   pSignalWindow->show();
}

---

onIRSignalReport() getting called on menu item clicks.

lets user clicked multiple times and multiple SignalWindow is displayed.

if user close one of the user window then how I delete that pointer(pSignalWindow ) ?:(

set Qt::WA_DeleteOnClose for your window, e.g.

Code:

---

void MainWindow::onIRSignalReport()
{
   ...
   SignalWindow *pSignalWindow = new SignalWindow();
   pSignalWindow->setAttribute(Qt::WA_DeleteOnClose);
   pSignalWindow->setSignalFile(fileName);
   pSignalWindow->show();
}

---

Thanks spirit.

and, how to close pSignalWindow if application closed?

if I pass this pointer also it is not getting closed.
SignalWindow *pSignalWindow = new SignalWindow((QDialog *)this);

if you close your app, SignalWindow will not be closed, since you have not passed a parent into SignalWindow ctor, line 4 of your code. so, anyway you must to close this window.

Code:

---

void MainWindow::onIRSignalReport()
{
   ...
   SignalWindow *pSignalWindow = new SignalWindow((QDialog *)this);
   pSignalWindow->setAttribute(Qt::WA_DeleteOnClose);
   pSignalWindow->setSignalFile(fileName);
   pSignalWindow->show();
}

---

now I am passing parent, right? but why It is not getting closed?

I don't know, works fine for me. show us main.cpp code.

Code:

---

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
 
	GUIManager * pGUIManager = GUIManager::getInstance(); // GUIManager is a singleton 
	pGUIManager->initialize();
 
	return a.exec();
}
 
bool GUIManager::initialize()
{
   bool result = true; //TODO: may be required.
 
   pMainWindow = new MainWindow;
 
   return result;
}

---

play with this test app
test.h

Code:

---

#ifndef TEST_H
#define TEST_H
 
#include <QDialog>
 
class Test: public QDialog
{
	Q_OBJECT
 
public:
	Test(QWidget *parent = 0);	
 
private slots:
	void addWindowWithParent();
	void addWindowWithoutParent();
 
};
 
#endif//TEST_H

---

test.cpp

Code:

---

#include <QtGui>
#include "test.h"
 
Test::Test(QWidget *parent)
	: QDialog(parent)
{
	QHBoxLayout *hbl = new QHBoxLayout(this);
	QPushButton *pb1 = new QPushButton(tr("Add window with parent"));
	QPushButton *pb2 = new QPushButton(tr("Add window without parent"));
 
	hbl->addWidget(pb1);
	hbl->addWidget(pb2);
 
	connect(pb1, SIGNAL(clicked()), SLOT(addWindowWithParent()));
	connect(pb2, SIGNAL(clicked()), SLOT(addWindowWithoutParent()));
 
	setWindowTitle(tr("main"));
}
 
void Test::addWindowWithParent()
{
	Test *test = new Test(this);
	test->setAttribute(Qt::WA_DeleteOnClose);
	test->move(x() + 40, y() + 40);
	test->setWindowTitle(tr("with parent"));
	test->show();
}
 
void Test::addWindowWithoutParent()
{
	Test *test = new Test();
	test->setAttribute(Qt::WA_DeleteOnClose);
	test->move(x() + 40, y() + 40);
	test->setWindowTitle(tr("without parent"));
	test->show();
}

---

main.cpp

Code:

---

#include <QApplication>
#include "test.h"
 
int main(int argc, char **argv)
{
	QApplication app(argc, argv);
 
	Test test;
	test.show();
 
	return app.exec();
}

---

Hi spirit,
your test app:

closing first window not closing 2nd window.
but, closing 2nd window closing all child window(3rd window onwords).

why it is so?

if you create several windows with a parent and then close a parent window, then all windows will be closed too, but if you create several windows with parent and one (or several) windows without parent and then close a parent, then all windows wich have a parent will be close, but that windows which have not a parent will be stay opened.

I have created several window with parent, but closing first parent not closing child window.
but closing 2nd window closing all child window.

I am using Qt4.3.1

probably, at first you create a window witout parent and then you pressed "Add with parent" button and created a window and so on. so, when you closed first window it was closed, but when you closed second one, automatically all children have been closed too.

fisrt one also created by passing parent, but how this matters.
if I am closing 1st window it should close all child window, no matters 1st window having parent or not. it is matters of 2nd window having parent.

in main.cpp a new window is created, then when you click "Add without parent" and close first window the second will be opened. isn't it?

I have never clicked on "Add without parent"

take a look at video, works fine.