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List:       kde-devel
Subject:    QListBox::highlighted() in extended-select mode
From:       Adriaan de Groot <adridg () cs ! kun ! nl>
Date:       2003-02-01 23:58:36
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I'm having a little weirdness with highlighted() in QListBoxes in extended 
select mode. It may just be a documentation issue. The list box starts off 
with no item selected. If I select a single item in the list box, 
highlighted(int) is emitted once. If I now select another single item in the 
list, highlighted() is emitted _twice_, once for the item which was selected 
and is no longer, and once for the new item that is selected. The attached 
tiny program demonstrates this. I understand fully that I can use 
isSelected() to discard the unwanted signal. The docs say:

	The highlighted() signal is emitted when a new item gets highlighted, e.g. 
because the user clicks on it or QListBox::setCurrentItem() is called.

To me, that suggests that it only gets called for the new item, not for the 
old item. My question is: is this intentional? Should there be a note in the 
docs saying "only d00fuses would use highlighted() in conjunction with 
extended selection"? 

-- 
pub  1024D/FEA2A3FE 2002-06-18 Adriaan de Groot <groot@kde.org>
     Key fingerprint = 934E 31AA 80A7 723F 54F9  50ED 76AC EE01 FEA2 A3FE
["t.cpp" (text/x-c++src)]

#include <qapplication.h>
#include <qstring.h>

#include "t.moc"

#include <iostream>

MyWindow::MyWindow(QWidget *parent) : 
	QVBox(parent)
{
	qc = new QListBox(this);
	qc->setSelectionMode(QListBox::Extended);
	ql = new QLabel(this);
	tally = 0;
	boxHighlighted(0);

	for (int i=0; i<6; i++)
	{
		qc->insertItem(QString::fromLatin1("Item %1").arg(i));
	}

	QObject::connect(qc,SIGNAL(highlighted(int)),
		this,SLOT(boxHighlighted(int)));
}

void MyWindow::boxHighlighted(int i)
{
	QString s;
	tally+=i;
	s = QString::fromLatin1("Tally = %1").arg(tally);
	cerr << s << endl;
	ql->setText(s);
}

int main(int argc,char **argv)
{
	QApplication a(argc,argv);
	MyWindow w(0L);
	a.setMainWidget(&w);
	w.show();
	return a.exec();
}

["t.h" (text/x-chdr)]

#include <qlistbox.h>
#include <qvbox.h>
#include <qlabel.h>

class MyWindow : public QVBox
{
Q_OBJECT

public:
	MyWindow(QWidget *parent);

public slots:
	void boxHighlighted(int);

protected:
	QListBox *qc;
	QLabel *ql;
	int tally;
} ;

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