[Solved]Get value of checkbox in a qtableview

[toho71]

Hello
I need some help to get the checked value in a tableview.

My code looks like this
@ QModelIndexList selectedList= ui->testTable->selectionModel()->selectedRows(5);//colum som läggs till listan
QModelIndex index = ui->testTable->currentIndex();

QBrush cyan;
cyan.setColor(Qt::cyan);
cyan.setStyle(Qt::SolidPattern);

foreach (index,selectedList )
{
    if (dataModel->data(index))
      dataModel->setData(index, cyan, Qt::BackgroundRole);
}

@

But i need to loop thrue the hole datamodel and check every box.

A hint someone

[giesbert]

Hi,

from your code, it's not clear what you want to achieve. It does not fir to the question.
Inside the code, you iterate all selected cells in column 5 and set the background color. Where comes the checked state into the game?

[andre]

If you want to query the checked state of a model, simply use the correct data role Qt::CheckStateRole, which returns a QVariant containing a Qt::CheckState.

However, it seems that you want to simply try to modify the rendering of checked items to give them a background color. That can be done more efficiently using a [[doc:QItemDelegate]].

[toho71]

bq. However, it seems that you want to simply try to modify the rendering of checked items to give them a background color. That can be done more efficiently using a QItemDelegate.

I want to check the state of the checkbox and it is in the 5 th column.
if the state is true/checked I want to change color of that row.

And i also want to se the total rows in the model.
Is it possible.

I'd like some simple exampels if there are some around.

[goetz]

For the background, use a [[Doc:QStyledItemDelegate]] subclass, as Andre suggested. Override the paint() method, check the row/column and data and put the changed background into the options and call the base class implementation in the end:

@
void MyItemDelegate::paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index )
{
QStyleOptionViewItemV4 newOption(option);
if(index.row() == 5) {
if(index.data(Qt::CheckStateRole) == Qt::Checked) {
newOption.backgroundBrush = QBrush(Qt::yellow);
}
}
QStyledItemDelegate::paint(painter, newOption, index);
}
@

(Brain to terminal, code is not tested)

You get the total number of rows using model->rowCount().

[toho71]

Thanks I'll try

[toho71]

Yes i worked but i want to loop thru the datamodel and check all checkboxes.
I thought i did that with my foreach but sometimes i got the right rowcount and the loop dosent work and sometimes i go thru the loop but only on one row.

[goetz]

The loop is executed by the view, it calls the delegate with the needed indexes.

[toho71]

I'll explain this in a new way.
After i put all my values in the model()(QStandardItemModel)
I put the model in the tableview.

When this is done I try to loop thru the datamodel and tries to check if the

@item->setFlags(Qt::ItemIsEnabled|Qt::ItemIsUserCheckable);
@
is checked.

If so I want to change color of that row.

thats why I want to loop thru this.

I'm sure that this is a simple task but I'm stuck now

[andre]

OK, so you want to color a complete row based on a set of conditions. Sounds like a job for a proxy model to me.

Something like:

@
//hightlightproxy.h
//in Qt 4.8, you should use QIdentityProxyModel (I think it is called, please check).

#if QT_VERSION >= 0x040800
#include <QIndentityProxy>
class HighLightProxy : public QIdentityProxyModel
{
typedef baseClass QIdentityProxyModel;
#else
#include <QSortFilterProxyModel>
class HighLightProxy : public QSortFilterProxyModel
{
typedef baseClass QSortFilterProxyModel;
#endif
Q_OBJECT

public:
HighLightProxy(QObject* parent = 0);

void setRow(int row);
void setCheckColumn(column);
void setHighlightBrush(const QBrush& brush);

virtual QVariant data(const QModelIndex & index, int role = Qt::DisplayRole ) const;

private:
int m_row;
int m_checkColumn;
QBrush m_brush;
}
@

@
//hightlightproxy.cpp
HighLightProxy::HighLightProxy(QObject* parent) :
baseClass(parent),
m_row(-1),
m_checkColumn(-1)
{}

QVariant HighLightProxy::data(const QModelIndex & index, int role ) const
{
if (!index.isValid())
return QVariant();

//lets assume you are not talking about a tree-type model here, and ignore parents
if (index.row() == m_row && role == Qt::BackGroundRole) {
//check the checkstate
if (m_checkColumn > -1) {
QModelIndex sIndex = sourceModel()->index(m_row, m_checkColumn);
if (sIndex.data(Qt::CheckStateRole).toInt() == Qt::Checked) {
return m_highlightBrush;
}
}
}
return baseClass::data(index, role);
}

//implementation of setters declared in header is trivial and thus not shown.
@

Note: written in forum editor, not complete, nor tested in a compiler.

[toho71]

I'll try this but I'm stuck with how to loop thru the tableview or datamodel to.
@foreach(datamodel,???)
{
code.....
]
@
A simpel loop but Not in my head for the moment.

pls help

[andre]

With the approach above, you don't need to loop through the view or the model.

[toho71]

Thanks for the code and its OK

No problems after a while.