Searching a QTableView for a specific row

[GreyGeek]

Folks,
I am trying to create a method that can take a user's input and scan a QTableView object for a matching value in column 1. So far, my code is:

void supervisormaint::searchNames(){
	QString findName = sui.leSearchText->text().trimmed();	
	QAbstractItemModel *modl = sui.EmployeesView->model();
	QModelIndex curr = sui.EmployeesView->currentIndex();
	int rc = modl->rowCount(curr.parent());
	QString name;
	QVariant vname;
	QModelIndex rIndex;
	for(int row = 0; row < rc; row++){
		rIndex = modl->createIndex (row, 1, 0);
		vname = modl->data(rIndex, 0);
		name = vname.toString();
		if (name.length() > 0 &&  name.contains(findName)  == 0){
			sui.EmployeesView->scrollTo(rIndex);
			return;
		}		
	}
	QMessageBox::information(this,"Name Search:", findName + " NOT found!");				
}

void supervisormaint::searchNames(){
	QString findName = sui.leSearchText->text().trimmed();	
	QAbstractItemModel *modl = sui.EmployeesView->model();
	QModelIndex curr = sui.EmployeesView->currentIndex();
	int rc = modl->rowCount(curr.parent());
	QString name;
	QVariant vname;
	QModelIndex rIndex;
	for(int row = 0; row < rc; row++){
		rIndex = modl->createIndex (row, 1, 0);
		vname = modl->data(rIndex, 0);
		name = vname.toString();
		if (name.length() > 0 &&  name.contains(findName)  == 0){
			sui.EmployeesView->scrollTo(rIndex);
			return;
		}		
	}
	QMessageBox::information(this,"Name Search:", findName + " NOT found!");				
}

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but my stumbling block is

rIndex = modl->createIndex (row, 1, 0);

which returns the compiler error:

'QAbstractItemModel::createIndex' : cannot access protected member declared in class 'QAbstractItemModel'

It appears that modl allows only for a single item index selected by the user.
I couldn't find a method to create an index array which would contain all 451 indexes that the view contains.

How do I do it?

[wysota]

The shortest possible object oriented and nice code would be:

QString findName = sui.leSearchText->text().trimmed();
QAbstractItemModel *modl = sui.EmployeesView->model();
QSortFilterProxyModel proxy;
proxy.setSourceModel(modl);
proxy.setFilterKeyColumn(0);
proxy.setFilterFixedString(findName);
// now the proxy only contains rows that match the name
// let's take the first one and map it to the original model
QModelIndex matchingIndex = proxy.mapToSource(proxy.index(0,0));
if(matchingIndex.isValid(){
  // ...
}

QString findName = sui.leSearchText->text().trimmed();
QAbstractItemModel *modl = sui.EmployeesView->model();
QSortFilterProxyModel proxy;
proxy.setSourceModel(modl);
proxy.setFilterKeyColumn(0);
proxy.setFilterFixedString(findName);
// now the proxy only contains rows that match the name
// let's take the first one and map it to the original model
QModelIndex matchingIndex = proxy.mapToSource(proxy.index(0,0));
if(matchingIndex.isValid(){
  // ...
}

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As for your code - simply substitute createIndex() with index() - you don't need to create an index, just ask the model to give you one.

[GreyGeek]

Wow, wysota, you must do "Mind Melds" with the API
I'm going to give you a new nickname: SPOCK!

Your proxy suggestion was fabulous! Much simpler, more elegant.

Here is the final version:

void supervisormaint::searchNames(){
	QString findName = sui.leSearchText->text().trimmed();	
	QAbstractItemModel *modl = sui.EmployeesView->model();
	QSortFilterProxyModel proxy;
	proxy.setSourceModel(modl);
	proxy.setFilterKeyColumn(1);
	proxy.setFilterFixedString(findName);
	// now the proxy only contains rows that match the name
	// let's take the first one and map it to the original model
	QModelIndex matchingIndex = proxy.mapToSource(proxy.index(0,0));
	if(matchingIndex.isValid()){
		sui.EmployeesView->scrollTo(matchingIndex,QAbstractItemView::EnsureVisible);
	} else {
		QMessageBox::information(this,"Name Search:", "Match not found!");				
	}
}

void supervisormaint::searchNames(){
	QString findName = sui.leSearchText->text().trimmed();	
	QAbstractItemModel *modl = sui.EmployeesView->model();
	QSortFilterProxyModel proxy;
	proxy.setSourceModel(modl);
	proxy.setFilterKeyColumn(1);
	proxy.setFilterFixedString(findName);
	// now the proxy only contains rows that match the name
	// let's take the first one and map it to the original model
	QModelIndex matchingIndex = proxy.mapToSource(proxy.index(0,0));
	if(matchingIndex.isValid()){
		sui.EmployeesView->scrollTo(matchingIndex,QAbstractItemView::EnsureVisible);
	} else {
		QMessageBox::information(this,"Name Search:", "Match not found!");				
	}
}

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[wysota]

Wow, wysota, you must do "Mind Melds" with the API

Thanks. If I only knew what "Mind melds" were To be honest, I look up to the best. Attending Trolltech DevDays in Munich this year (greetings to all the guys and girls (ok, one girl) I met there!) opened my eyes on some issues.

I'm going to give you a new nickname: SPOCK!

I feel my ears growing already. Live long and prosper!

Your proxy suggestion was fabulous! Much simpler, more elegant.

And a bit slower

Note, that you can use the same code to implement a "progressive search" (in the "search when you write" way). You only need to connect a line edit's textChanged() signal to setFilterRegExp() of the proxy model.

[QExcel(&ASAP)]

Hello all. My doubt is that why do we need QModelIndex when we are setting the QSortFilterProxyModel::setSourceModel. I have tried without using QModelIndex and still I am able to find the string.

Qt code:
void filterPane::searchStr()
{
QString m_searchString = ui->cQIconLineEdit->text();
QSortFilterProxyModel proxy;
proxy.setSourceModel(alarmsModel);
proxy.setFilterRegExp(QRegExp(m_searchString, Qt::CaseInsensitive,
QRegExp::FixedString));
proxy.setFilterKeyColumn(2);
proxy.setFilterFixedString(m_searchString);

fp->hideWithEffect();
alarmPage *al = alarmPage::instance(&frame);
al->ui->AlarmsTable->setModel(&proxy);
}