destroy QHBoxLayout

[maarvi]

hello ever one here is my code i am calling all these statements in my button event handler like this

void analysis::on_pushButton_clicked()
{
 myplot * p = new myplot(gao.structpayloadgraph,gao1.structpayloadgraph, gao.structcol-2, "payload");
 
    myplot * p1 = new myplot(gao.structsessiongraph,gao.structsessiongraph ,gao.structcol-2, "session");
 
 
  QHBoxLayout * layout = new QHBoxLayout;
 ui->horizontalLayout_2->addLayout(layout);
 layout->addWidget(p);
 layout->addWidget(p1);
 
}

void analysis::on_pushButton_clicked()
{
 myplot * p = new myplot(gao.structpayloadgraph,gao1.structpayloadgraph, gao.structcol-2, "payload");

    myplot * p1 = new myplot(gao.structsessiongraph,gao.structsessiongraph ,gao.structcol-2, "session");


  QHBoxLayout * layout = new QHBoxLayout;
 ui->horizontalLayout_2->addLayout(layout);
 layout->addWidget(p);
 layout->addWidget(p1);

}

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myplot is graph plotting class but the problem is that each time i click the button new graph appear and previous remains, like one !st click 2 appear on second they become 4 then 6...... how to i destroy QHBoxLayout in my button event handler

thanks

[Santosh Reddy]

Not sure why you are adding layout to another layout. Add all the plots to a container widget, and delete the container widget as an when required, like this

analysis {
...
private:
	QWidget * container;
}
 
void analysis::analysis()
{
	container= 0;
}
 
void analysis::on_pushButton_clicked()
{
	if(container)
		delete container;
 
	myplot * p = new myplot(gao.structpayloadgraph,gao1.structpayloadgraph, gao.structcol-2, "payload");
	myplot * p1 = new myplot(gao.structsessiongraph,gao.structsessiongraph ,gao.structcol-2, "session");
 
	QHBoxLayout * layout = new QHBoxLayout;
	layout->addWidget(p);
	layout->addWidget(p1);
	container->setLayout(layout);
 
	ui->horizontalLayout_2->addWidget(container);
}

analysis {
...
private:
	QWidget * container;
}

void analysis::analysis()
{
	container= 0;
}

void analysis::on_pushButton_clicked()
{
	if(container)
		delete container;

	myplot * p = new myplot(gao.structpayloadgraph,gao1.structpayloadgraph, gao.structcol-2, "payload");
	myplot * p1 = new myplot(gao.structsessiongraph,gao.structsessiongraph ,gao.structcol-2, "session");

	QHBoxLayout * layout = new QHBoxLayout;
	layout->addWidget(p);
	layout->addWidget(p1);
	container->setLayout(layout);

	ui->horizontalLayout_2->addWidget(container);
}

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[maarvi]

thanks u sir i wrote

while(!ui->horizontalLayout_3->isEmpty())
    { QWidget * w = ui->horizontalLayout_3->takeAt(0)->widget();
              delete w;
          }

while(!ui->horizontalLayout_3->isEmpty())
    { QWidget * w = ui->horizontalLayout_3->takeAt(0)->widget();
              delete w;
          }

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and it worked for me thanks for your help