QTreeWidget clicked signal

[^NyAw^]

Hi,

I'm having problems to get a signal when I click on a QTreeWidget. The problem is that if no item is selected there is no signal emmited.

I need to know if I clicked on an empy region of the Tree because I have actions that I have to enable or diable depending on the item that is clicked. But if I click out of any item I would all the actions disabled.

Thanks,

[wysota]

Try this:

connect(view->selectionModel(), SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)), this, SLOT(yourSlotGoesHere()));

connect(view->selectionModel(), SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)), this, SLOT(yourSlotGoesHere()));

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Just make sure clicking outside any item clears the selection.

[^NyAw^]

Hi,

I have tryied it. It connects but the signal is only emmited when I click on a item.

[wysota]

Do it lowlevel then. Reimplement the mouseReleaseEvent of the widget and use itemAt() to check the item under cursor.

[^NyAw^]

Hi,

So, have I to inherit from QTreeWidget and reimplement the "mouseReleaseEvent" function?

Thanks,

[^NyAw^]

Hi,

Anyone knows how to make it? Have I to inherit from QTreeWidget and reimplement "mouseReleaseEvent" function or there is another way?

Thanks,

[wysota]

Hmm.... Could you read my last post again?

[^NyAw^]

Hi,

Ok, Ok, so ther isn't another way.

Thanks,

[mkkguru]

i too have a getting same problem related to treewidget item signals ,

QTreeWidgetItem  *plc = new QTreeWidgetItem(ui->treeWidget);
     plc->setText(0,QString("PLC %1").arg(i));
 
  if(plc)
    {
     connect(ui->treeWidget,SIGNAL(itemClicked(QTreeWidgetItem *,int)),this,SLOT(plcconfig()));
   }
 
  QTreeWidgetItem *plcItem = new QTreeWidgetItem(plc);
  plcItem->setText(0, tr("CONFIGURATION"));
  plc->addChild(plcItem);
 
 QTreeWidgetItem *cpuconfig = new QTreeWidgetItem(plcItem);
  cpuconfig->setText(0, tr("CPU CONFIGURATION"));
  plcItem->addChild(cpuconfig);
 
  //  if(cpuconfig)
 // {
 //  connect(ui->treeWidget,SIGNAL(itemClicked(QTreeWidgetItem *,int)),this,SLOT(showCPU()));
// }
 
  QTreeWidgetItem *varconfig = new QTreeWidgetItem(plcItem);
  varconfig->setText(0, tr("VARIABLE CONFIGURATION"));
  plcItem->addChild(varconfig);
 
  QTreeWidgetItem *progconfig = new QTreeWidgetItem(varconfig);
  progconfig->setText(0, tr("PROGRAM VARIABLE CONFIGURATION"));
  varconfig->addChild(progconfig);
 
   if(varconfig)
 {
   connect(ui->treeWidget,SIGNAL(itemClicked(QTreeWidgetItem *,int)),this,SLOT(showpvc()));
  }

QTreeWidgetItem  *plc = new QTreeWidgetItem(ui->treeWidget);
     plc->setText(0,QString("PLC %1").arg(i));

  if(plc)
    {
     connect(ui->treeWidget,SIGNAL(itemClicked(QTreeWidgetItem *,int)),this,SLOT(plcconfig()));
   }

  QTreeWidgetItem *plcItem = new QTreeWidgetItem(plc);
  plcItem->setText(0, tr("CONFIGURATION"));
  plc->addChild(plcItem);

 QTreeWidgetItem *cpuconfig = new QTreeWidgetItem(plcItem);
  cpuconfig->setText(0, tr("CPU CONFIGURATION"));
  plcItem->addChild(cpuconfig);

  //  if(cpuconfig)
 // {
 //  connect(ui->treeWidget,SIGNAL(itemClicked(QTreeWidgetItem *,int)),this,SLOT(showCPU()));
// }

  QTreeWidgetItem *varconfig = new QTreeWidgetItem(plcItem);
  varconfig->setText(0, tr("VARIABLE CONFIGURATION"));
  plcItem->addChild(varconfig);

  QTreeWidgetItem *progconfig = new QTreeWidgetItem(varconfig);
  progconfig->setText(0, tr("PROGRAM VARIABLE CONFIGURATION"));
  varconfig->addChild(progconfig);

   if(varconfig)
 {
   connect(ui->treeWidget,SIGNAL(itemClicked(QTreeWidgetItem *,int)),this,SLOT(showpvc()));
  }

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As iam using above signal when iam cliicking on PROGRAM VARIABLE CONF..... the required window has to opened as below.

void ECLogic::showpvc( )
{
    QTabBar *tab_4=new QTabBar(ui->widgetConf);
      PCD= new programvariableconfiguration(tab_4);
      PCD->setWindowTitle(QString("PVC"));
      tabwidget3->insertTab(0,tab_4,QString("PVC"));
      tab_4->setCurrentIndex(tabwidget3->indexOf(ui->widgetConf));
      tab_4->setTabsClosable(true);
      tab_4->setEnabled(true);
      PCD->show();
}

void ECLogic::showpvc( )
{
    QTabBar *tab_4=new QTabBar(ui->widgetConf);
      PCD= new programvariableconfiguration(tab_4);
      PCD->setWindowTitle(QString("PVC"));
      tabwidget3->insertTab(0,tab_4,QString("PVC"));
      tab_4->setCurrentIndex(tabwidget3->indexOf(ui->widgetConf));
      tab_4->setTabsClosable(true);
      tab_4->setEnabled(true);
      PCD->show();
}

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but my problem is getting the connections to all the treewidggetitems not for the particular....is there any way to get my condtion ....so please suggests me the way to write the code........

[wysota]

You get the pointer to the item in the signal so you can check its contents in the slot.

[mkkguru]

how can i set the pointer to the signal, we can't set values in connect statements.we should use types there.

Try this:

connect(ui.tree, SIGNAL(itemClicked (QTreeWidgetItem*,int)), this, SLOT(showplc()))