How to stop multiple appearance of a widget

[jpn]

....and you are still creating the dialog again and again.
You do not want to create a new instance of the dialog every time the button is pressed.

CPT::CPT(QWidget *parent):QWidget(parent)
{
	createFind(); // create the dialog ONLY ONCE
	QPushButton *findbox=new QPushButton();
	QObject::connect(findbox,SIGNAL(clicked()),this,SLOT(find()));
}
 
void CPT::find()
{
	// set your defaults here
	fwin->show();
	fwin->activateWindow();
	fwin->raise();
}
 
void CPT::createFind()
{
	fwin = new QWidget;
	// ...
}

CPT::CPT(QWidget *parent):QWidget(parent)
{
	createFind(); // create the dialog ONLY ONCE
	QPushButton *findbox=new QPushButton();
	QObject::connect(findbox,SIGNAL(clicked()),this,SLOT(find()));
}

void CPT::find()
{
	// set your defaults here
	fwin->show();
	fwin->activateWindow();
	fwin->raise();
}

void CPT::createFind()
{
	fwin = new QWidget;
	// ...
}

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[Sarma]

sir,
Thank you very much. It is working well. Now I got the point. I was creating an instance of the window everytime I click the button. But here I got a doubt. We are creating the instance of the findbox in the application even before clicking it. Now for any reason if we donot click the button , doesn't that cause memory wastage? Kindly rectify my doubt.

Thanks once again for this useful post,
Sarma.

[fullmetalcoder]

sir,
Thank you very much. It is working well. Now I got the point. I was creating an instance of the window everytime I click the button. But here I got a doubt. We are creating the instance of the findbox in the application even before clicking it. Now for any reason if we donot click the button , doesn't that cause memory wastage? Kindly rectify my doubt.

Thanks once again for this useful post,
Sarma.

No memory leaks caused provided you use destructor wisely to free all used memory...

[jpn]

We are creating the instance of the findbox in the application even before clicking it. Now for any reason if we donot click the button , doesn't that cause memory wastage?

Since you don't supply any parent for the widget, it doesn't get destroyed automatically. So you will have to delete it in the descructor.
A widget without a parent is always an independent window.. But why don't you just use a modeless dialog? Then you could pass your window as a parent, the dialog would show up centered to your window, and it would get automatically deleted..