[Qt-interest] Event handling in QListWidget

[Malyushytsky, Alex]

I see a few problems here. It looks like you are trying to do two things:
a) populate QListWidget
b) connect QListWidget instance with some slots

So your code should be re-writen like:

listWidget = new QListWidget(this);

// a) insert your items. There are a few different ways to do it:

// 1 way
// In this case You need to insert QListWidgetItem into QListWidget (this code is absent in your example).
// To do this you MUST create it with  new, otherwise this item will be deleted as soon Item is out of scope:

QListWidgetItem *Item = new QListWidgetItem(this);
Item ->setText(tr("Item1"));
listWidget->insertItem( 0, Item); // insert

// 2 way
// If you don't need to set some specific to QListWidgetItem* properties you might not need QlistWidgetItem pointer,
// so you can just use QListWidget::addItem

QString label ( tr( "Item2" ) );
listWidget->addItem (label );

// for more ways, see documentation



// b) connecting signals to your slots
// You should review Signals and Slots information in QT documenntation, cause it looks like you misunderstand it
// I would use signal itemPressed, depending on your needs you might use itemClicked
// the difference is Pressed means item was clicked and mouse button was released over the items.

connect(listWidget, // object (instance) - signal sender
SIGNAL( itemPressed ( QListWidgetItem*  ) ), // signal declaration - No Item (object) there
this, // object (instance) slot owner ( signal reciever )
SLOT( ItemDisplay1( QListWidgetItem* ) ); // slot declaration - No Item (object) there

// connect(listWidget, SIGNAL( itemPressed ( QListWidgetItem*  ) ), this, SLOT( ItemDisplay1( QListWidgetItem* ) );
//

a) and b) sections are independent, you don't need pointers to QListWidgetItem to connect QListWidget signal to your slot,
 so you can remove section a) from here and popluate populate listWidget later.

Hope this help,

Alex Malyushytsky


________________________________________
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Ravi_Kalepalli
Sent: Thursday, February 05, 2009 2:39 AM
To: qt-interest at trolltech.com
Subject: [Qt-interest] Event handling in QListWidget

Hi All,

I am constructing listwidget for handling events using signal and slot.
When I am using
listWidget = new QListWidget(this);
QListWidgetItem Item(listWidget);
connect(listWidget,SIGNAL(itemPressed(Item)),this, SLOT(ItemDisplay1(Item )));
* void itemClicked ( QListWidgetItem * item )
* void itemDoubleClicked ( QListWidgetItem * item )
* void itemPressed ( QListWidgetItem * item )

What I want is if I click any item in the widget slot is not getting executed


void Mediagallery::ItemDisplay1(QListWidgetItem * item )
      {
      QMessageBox msgBox;
       msgBox.setText("The document has been modified.");
       msgBox.exec();
      }

Please suggest me.

Thanks and Regards

Ravi Kalepalli
Telephone: 080-67807807
Mobile: 98807 24688



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