HightLight particular Row in QStandardItemModel QTableView

[rex]

Hello every one i am working a data representing software where i show some pressure type data in a QTableView.. I have written a function to tell if the pressure data has exceeded the limits which is set by the user in the GUI. But i wanted to highlight the QTableView Cell which has crossed the limit. I could not find out how to hightlight. Can some one pls help me out with this problem i don't know how to hightlight the a particular row data in table view.. The Data in the Table View is refreshed every 3 seconds.

for(int kt=0; kt<pressuredata.count(); kt++)
	 {
		 if((maxval < pressuredata.at(kt).toFloat())||(minval > pressuredata.at(kt).toFloat()))
			{
					qLed2_2->setColor(Qt::red);
					label_9->setText("Pressure Limit Excceded");
					setlimiflag =1;
                                        limitposi = kt;
					break;
			}			
 
		  else	
			   setlimiflag =0;

for(int kt=0; kt<pressuredata.count(); kt++)
	 {
		 if((maxval < pressuredata.at(kt).toFloat())||(minval > pressuredata.at(kt).toFloat()))
			{
					qLed2_2->setColor(Qt::red);
					label_9->setText("Pressure Limit Excceded");
					setlimiflag =1;
                                        limitposi = kt;
					break;
			}			

		  else	
			   setlimiflag =0;

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I am thinking the position kt can be used to highlight the particular row in the table view which is out of limits.. Give me some suggestions on how i could go about this. and how should i highlight a row in QTableView. ??

Regards

[aamer4yu]

You can set background color for all columns in the row u want.
Other way is to use a delegate. In delegate you can check for a condition and then paint accordingly

[Octal]

Currently, I see two ways of doing this :

try setting the Qt::BackgroundRole of the designated cell in your model.

Otherwise, you could try defining your own delegate (QStyledItemDelegate) and overriding the

QStyledItemDelegate::paint

QStyledItemDelegate::paint

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method to highlight your cell :

void MyDelegate::::paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const 
{
    int value = index.model()->data().toInt();
    if (value > max)
    {
        painter->fillRect(option.rect, Qt::red);
    }
}

void MyDelegate::::paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const 
{
    int value = index.model()->data().toInt();
    if (value > max)
    {
        painter->fillRect(option.rect, Qt::red);
    }
}

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(didn't try the code).

[rex]

thank you so much i will try it Octal. i will read upon Qt::BackgroundRole too.

regards

---

Added after 1 17 minutes:

Hey i tried looking at the code but din't understand how to use it exactly. . This is what i am to doing after retrieving the data from the db to update the table and show a Red QLed when there is some data out of limit. But i wanted to highlight the cells of the crossed limits. i could't figureout how to use it.

void datadisplay::Updatetable()
{
	QStandardItemModel *model ;
	model = new QStandardItemModel();
	model->clear();
// Data is appended to pressuredata every second from the db.
 for(int i=0;i< pressuredata.count(); i++)
			 {
                 		QStandardItem *item = new QStandardItem(pressuredata.at(i));
        			model->setItem(i, 0, item);
 
		     	 }
         model->setHeaderData(0, Qt::Horizontal, tr("ID"));
	 model->setHeaderData(1, Qt::Horizontal, tr("Pressure"));
	 model->setHeaderData(2, Qt::Horizontal, tr("RAW"));
 
	 tableView->setModel(model);	
	 tableView->setAlternatingRowColors(true);
 
 
for(int kt=0; kt<pressuredata.count(); kt++)   //QVector<QString> pressuredata;
	 {
		 if((maxval < pressuredata.at(kt).toFloat())||(minval > pressuredata.at(kt).toFloat()))
			{
					qLed2_2->setColor(Qt::red);
					label_9->setText("Pressure Limit Excceded");
					setlimiflag =1;
				//	limtposi = kt;
					break;
			}			
 
		  else	
			   setlimiflag =0;
}

void datadisplay::Updatetable()
{
	QStandardItemModel *model ;
	model = new QStandardItemModel();
	model->clear();
// Data is appended to pressuredata every second from the db.
 for(int i=0;i< pressuredata.count(); i++)
			 {
                 		QStandardItem *item = new QStandardItem(pressuredata.at(i));
        			model->setItem(i, 0, item);
						
		     	 }
         model->setHeaderData(0, Qt::Horizontal, tr("ID"));
	 model->setHeaderData(1, Qt::Horizontal, tr("Pressure"));
	 model->setHeaderData(2, Qt::Horizontal, tr("RAW"));
	 
	 tableView->setModel(model);	
	 tableView->setAlternatingRowColors(true);


for(int kt=0; kt<pressuredata.count(); kt++)   //QVector<QString> pressuredata;
	 {
		 if((maxval < pressuredata.at(kt).toFloat())||(minval > pressuredata.at(kt).toFloat()))
			{
					qLed2_2->setColor(Qt::red);
					label_9->setText("Pressure Limit Excceded");
					setlimiflag =1;
				//	limtposi = kt;
					break;
			}			

		  else	
			   setlimiflag =0;
}

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can you guide me to how to use the code you suggested .,.

regards

[Octal]

Examine this code :

#include "mainwindow.h"
 
#include <QtGui>
#include <QTime>
 
static const int Rows = 5;
static const int Columns = 5;
static const int Max = 55;
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    view = new QTableView;
    model = new QStandardItemModel(Rows, Columns, this);
 
    setCentralWidget(view);
    qsrand(QTime::currentTime().msec());
    setupModel();
    checkLimits();
}
 
MainWindow::~MainWindow()
{
 
}
 
void MainWindow::setupModel()
{
    for (int i = 0; i < Rows; ++i)
    {
        for (int j = 0; j < Columns; ++j)
        {
            int v = qrand() % 100;
            model->setData(model->index(i, j), v);
        }
    }
    view->setModel(model);
}
 
void MainWindow::checkLimits()
{
    for (int i = 0; i < model->rowCount(); ++i)
    {
        for (int j = 0; j < model->columnCount(); ++j)
        {
            int value = model->item(i, j)->text().toInt();
            if (value > Max)
            {
                model->setData(model->index(i, j), Qt::red, Qt::BackgroundRole);
            }
        }
    }
}

#include "mainwindow.h"

#include <QtGui>
#include <QTime>

static const int Rows = 5;
static const int Columns = 5;
static const int Max = 55;

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    view = new QTableView;
    model = new QStandardItemModel(Rows, Columns, this);

    setCentralWidget(view);
    qsrand(QTime::currentTime().msec());
    setupModel();
    checkLimits();
}

MainWindow::~MainWindow()
{

}

void MainWindow::setupModel()
{
    for (int i = 0; i < Rows; ++i)
    {
        for (int j = 0; j < Columns; ++j)
        {
            int v = qrand() % 100;
            model->setData(model->index(i, j), v);
        }
    }
    view->setModel(model);
}

void MainWindow::checkLimits()
{
    for (int i = 0; i < model->rowCount(); ++i)
    {
        for (int j = 0; j < model->columnCount(); ++j)
        {
            int value = model->item(i, j)->text().toInt();
            if (value > Max)
            {
                model->setData(model->index(i, j), Qt::red, Qt::BackgroundRole);
            }
        }
    }
}

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in setupModel, I'm putting some random datas into a QStandardItemModel. Then, in checkLimits function, I'm checking each cell, and setting the corresponding Qt::BackgroundRole to Qt::red if the value exceeded the limit.

this is the BackgroundRole approach described above.

[rex]

Thank you so much for the help Octal.. That solved my problem.. The Cells in which the data is above the limit is highlighted.

Regards