Default Item View classes and returning data from model

Hello,
I am trying really hard to get some data from item view classes.I have tried to do it with QTreeView or QTreeWidget unsuccesfully so i need your help ! WIth QtreeView i know it has to do something with selectionmodel() and Qtreewidget has selectedItems().

I want to setup this 2 dimensional table at which the user can select a row. After the selection i want to get this selection and read lets say the 5th column which contains an ID that i need.

Things is i have totally failed to do that !
Any idea ?
I am open to other implementations if you think that can be done differently ! Even though i would like to have horizontal headers !

Thank you.

see model-view-programming; we will gladly answer specific questions you have

Ok here it is. Maybe this can be more specific... Last is the part that i have problem and focuses over to the part where i have to move the index i get to the correct column

Code:

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#include <QWidget>
#include <QtGui>
#include "CameraDataBase.h"
 
class QAbstractItemModel;
class QCheckBox;
class QComboBox;
class QGroupBox;
class QLabel;
class QLineEdit;
class QSortFilterProxyModel;
class QTreeView;
 
class cameraDataBaseModel : public QWidget
{
	Q_OBJECT
 
public:
	cameraDataBaseModel(QWidget *parent = 0,CCameraDataBase * cameraDataBase=0);
	~cameraDataBaseModel();
 
	void setSourceModel(QAbstractItemModel *model);
	QAbstractItemModel * setupModel();
	void addCamera(QAbstractItemModel *model, const QString &cameraModel,
					const double &FocalLength, const int &ImageWidth,
					const int &ImageHeight, const int &cameraID);
 
private slots:
		void filterRegExpChanged();
		void filterColumnChanged();
		void sortChanged();
		void accept();
 
private:
	QSortFilterProxyModel *cameraModel;
 
	QTreeView *cameraView;
	QCheckBox *filterCaseSensitivityCheckBox;
	QCheckBox *sortCaseSensitivityCheckBox;
	QLabel *filterPatternLabel;
	QLabel *filterSyntaxLabel;
	QLabel *filterColumnLabel;
	QLineEdit *filterPatternLineEdit;
	QComboBox *filterSyntaxComboBox;
	QDialogButtonBox *buttonBox;
 
	CCameraDataBase * camDataBase;
	QComboBox *filterColumnComboBox;
	QStandardItemModel *model;
 
};
 
#endif // CAMERADATABASEMODEL_H

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Code:

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#include "CameraDataBaseModel.h"
#include <QtGui>
 
cameraDataBaseModel::cameraDataBaseModel(QWidget *parent,CCameraDataBase * cameraDataBase)
: QWidget(parent)
{
	this->camDataBase = cameraDataBase;
 
	this->cameraModel = new QSortFilterProxyModel;
	this->cameraModel->setDynamicSortFilter(true);
 
	this->cameraView = new QTreeView();
	this->cameraView->setRootIsDecorated(false);
	this->cameraView->setAlternatingRowColors(true);
	this->cameraView->setModel(cameraModel);
	this->cameraView->setSortingEnabled(true);
 
	this->setSourceModel(setupModel());
	this->cameraView->hideColumn(4);
 
	this->sortCaseSensitivityCheckBox = new QCheckBox(tr("Case sensitive sorting"));
	this->filterCaseSensitivityCheckBox = new QCheckBox(tr("Case sensitive filter"));
 
	this->filterPatternLineEdit = new QLineEdit;
	this->filterPatternLabel = new QLabel(tr("&Filter pattern:"));
	this->filterPatternLabel->setBuddy(filterPatternLineEdit);
 
	this->filterSyntaxComboBox = new QComboBox;
	this->filterSyntaxComboBox->addItem(tr("Regular expression"), QRegExp::RegExp);
	this->filterSyntaxComboBox->addItem(tr("Wildcard"), QRegExp::Wildcard);
	this->filterSyntaxComboBox->addItem(tr("Fixed string"), QRegExp::FixedString);
	this->filterSyntaxLabel = new QLabel(tr("Filter &syntax:"));
	this->filterSyntaxLabel->setBuddy(filterSyntaxComboBox);
 
	this->filterColumnComboBox = new QComboBox;
	this->filterColumnComboBox->addItem(tr("Camera Model"));
	this->filterColumnComboBox->addItem(tr("Focal Length"));
	this->filterColumnComboBox->addItem(tr("Image Width"));
	this->filterColumnComboBox->addItem(tr("Image Height"));
	this->filterColumnLabel = new QLabel(tr("Filter &column:"));
	this->filterColumnLabel->setBuddy(filterColumnComboBox);
 
	this->buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok
                                      | QDialogButtonBox::Cancel);
 
	connect(filterPatternLineEdit, SIGNAL(textChanged(const QString &)),
		this, SLOT(filterRegExpChanged()));
	connect(filterSyntaxComboBox, SIGNAL(currentIndexChanged(int)),
		this, SLOT(filterRegExpChanged()));
	connect(filterColumnComboBox, SIGNAL(currentIndexChanged(int)),
		this, SLOT(filterColumnChanged()));
	connect(filterCaseSensitivityCheckBox, SIGNAL(toggled(bool)),
		this, SLOT(filterRegExpChanged()));
	connect(sortCaseSensitivityCheckBox, SIGNAL(toggled(bool)),
		this, SLOT(sortChanged()));
 
	connect(this->buttonBox, SIGNAL(accepted()), this, SLOT(accept()));
	connect(this->buttonBox, SIGNAL(rejected()), this, SLOT(close()));
 
	QGridLayout *cameraLayout = new QGridLayout;
	cameraLayout->addWidget(cameraView, 0, 0, 1, 3);
	cameraLayout->addWidget(filterPatternLabel, 1, 0);
	cameraLayout->addWidget(filterPatternLineEdit, 1, 1, 1, 2);
	cameraLayout->addWidget(filterSyntaxLabel, 2, 0);
	cameraLayout->addWidget(filterSyntaxComboBox, 2, 1, 1, 2);
	cameraLayout->addWidget(filterColumnLabel, 3, 0);
	cameraLayout->addWidget(filterColumnComboBox, 3, 1, 1, 2);
	cameraLayout->addWidget(filterCaseSensitivityCheckBox, 4, 0, 1, 2);
	cameraLayout->addWidget(sortCaseSensitivityCheckBox, 4, 2);
	cameraLayout->addWidget(buttonBox,5,2);
	setLayout(cameraLayout);
 
	setWindowTitle(tr("Select Camera"));
	resize(450, 400);
 
	this->cameraView->sortByColumn(2, Qt::AscendingOrder);
	this->filterColumnComboBox->setCurrentIndex(0);
 
	this->filterPatternLineEdit->setText("");
	this->filterCaseSensitivityCheckBox->setChecked(false);
	this->sortCaseSensitivityCheckBox->setChecked(false);
}
 
cameraDataBaseModel::~cameraDataBaseModel()
{
 
}
 
void cameraDataBaseModel::setSourceModel(QAbstractItemModel *model)
{
	cameraModel->setSourceModel(model);
}
 
void cameraDataBaseModel::filterRegExpChanged()
{
	QRegExp::PatternSyntax syntax =
		QRegExp::PatternSyntax(filterSyntaxComboBox->itemData(
		filterSyntaxComboBox->currentIndex()).toInt());
	Qt::CaseSensitivity caseSensitivity =
		filterCaseSensitivityCheckBox->isChecked() ? Qt::CaseSensitive
		: Qt::CaseInsensitive;
 
	QRegExp regExp(filterPatternLineEdit->text(), caseSensitivity, syntax);
	cameraModel->setFilterRegExp(regExp);
}
 
void cameraDataBaseModel::filterColumnChanged()
{
	cameraModel->setFilterKeyColumn(filterColumnComboBox->currentIndex());
}
 
void cameraDataBaseModel::sortChanged()
{
	cameraModel->setSortCaseSensitivity(
		sortCaseSensitivityCheckBox->isChecked() ? Qt::CaseSensitive
		: Qt::CaseInsensitive);
}
 
 
void cameraDataBaseModel::addCamera(QAbstractItemModel *model, const QString &cameraModel,
					const double &FocalLength,const int &ImageWidth, const int &ImageHeight, const int &cameraID)
{
	model->insertRow(0);
	model->setData(model->index(0, 0), cameraModel);
	model->setData(model->index(0, 1), FocalLength);
	model->setData(model->index(0, 2), ImageWidth);
	model->setData(model->index(0, 3), ImageHeight);
	model->setData(model->index(0, 4), cameraID);
}
 
 
QAbstractItemModel * cameraDataBaseModel::setupModel()
{
	model = new QStandardItemModel(0, 5);
 
	model->setHeaderData(0, Qt::Horizontal, QObject::tr("Camera Model"));
	model->setHeaderData(1, Qt::Horizontal, QObject::tr("Focal Length"));
	model->setHeaderData(2, Qt::Horizontal, QObject::tr("Image Width"));
	model->setHeaderData(3, Qt::Horizontal, QObject::tr("Image Height"));
	model->setHeaderData(4, Qt::Horizontal, QObject::tr("Camera ID"));
 
	for (int i =0; i < this->camDataBase->globalCameras.GetSize(); i++)
	{
		addCamera( model, QString::fromUtf8(this->camDataBase->globalCameras.GetAt(i)->getMakeAndModel()),
			this->camDataBase->globalCameras.GetAt(i)->getFocalLength(),
			this->camDataBase->globalCameras.GetAt(i)->getImageWidth(),
			this->camDataBase->globalCameras.GetAt(i)->getImageHeight(), i );
	}
 
	return model;
}
 
void cameraDataBaseModel::accept()
{
    //this where i want to grab the selection of the user and find the Camera ID which is the 4th colum of the model
}

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Here is What i have tried

Code:

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// What i have tried is getting the currentindex() which actually works like a charm 
// from what is see while debugging as i get the row and column select
QModelIndex curIndex = cameraView->currentIndex() ;
 
// Then get the row
 int numRows = curIndex.row();
//move to the column but over here i get an invalid ModelIndex cause i see in debugging r=-1 c=-1 
QModelIndex index = model->index(numRows, 4, curIndex);
 
//then get the data 
QVariant blabla = index.data (Qt::DisplayRole)

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Everything works but the part of moving to the column i want.
So definately there is something wrong over here and i am trying things but cant sort it out :S

Any idea?


PS. Yes i know that this is 99% the same with the example that Trolltech provides about sorting etc...!

From what I understood, you want to get the sibling, not a child of "curIndex". It's easiest to do with QModelIndex::sibling():

Code:

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QModelIndex index = curIndex.sibling(numRows, 4);

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Alternatively you can do similar than you tried, but with correct parent:

Code:

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QModelIndex index = model->index(numRows, 4, curIndex.parent());

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Awesome , this was exactly what i wanted ;)
The sibling thingie makes things much easier but its good to know how to sort it out the way i was trying so i know my mistake :)

Thank you

Is there any way to set some of the colums of my model to not be editable ?
Also my second column contains double variables. When you click to it you get a QDoubleSpinBox but it only allows 2 decimals ! How can i change that to lets say 5 ?

Quote:

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Originally Posted by xerionn

Is there any way to set some of the colums of my model to not be editable ?

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Yes, reimplement QAbstractItemModel::flags() for your model and make sure ItemIsEditable is not returned for indexes from those columns.

Quote:

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Also my second column contains double variables. When you click to it you get a QDoubleSpinBox but it only allows 2 decimals ! How can i change that to lets say 5 ?

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Reimplement either QAbstractItemDelegate::createEditor() or QAbstractItemDelegate::setEditorData().

Quote:

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Originally Posted by wysota

Yes, reimplement QAbstractItemModel::flags() for your model and make sure ItemIsEditable is not returned for indexes from those columns.



Reimplement either QAbstractItemDelegate::createEditor() or QAbstractItemDelegate::setEditorData().

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Hi Wysota,

Sorry to bug you, but I've been trying to use a QtreeView with checkboxes enclosed for each item with not much progress. I followed some thread in the forum and reimplement the flags method in my model class to include ItemIsUserCheckable. Now I can see the checkboxes appear next to each item in the tree. However, I cannot check or uncheck the checkboxes at all. I see some people advice that I should implement the setData() method in my model class but I have no clue on how to do that. Could you shed some light here?

Thanks a lot

What is the base class of your model?