Highlighting the border of cell in Table

Hi all,

i want to highlight the boundry of a cell in a table instead of changing the background, same as it happens in excel.

how can i do it ??

For example with a custom delegate.
Inherit QItemDelegate and override drawFocus().

can u explain a bit more ... i m new to qt and not able to get how to do it.

i made a new class QGrid inherited QTablewidget in it.

now how to get the individual cell dimension in it.

rect is a inherited function of QTableWidget, but not of QTableWidgetItem, so how to get the dim. of cell.

//class declaration.

Code:

---

class QGrid : public QTableWidget
{
public:
QGrid(int x,int y,QWidget *parent = 0);
}

---

//implementation

Code:

---

QGrid *table = new QGrid(5,5); //this creates a table
 
for(int i=0;i<5;i++)
{
	for(int j =0;j<5;j++)
	{
		QTableWidgetItem *t = new QTableWidgetItem;
		t->setText("");
		table->setItem(j,i,t);
	}
}

---

where can i get the cell dimensions to make the boundry darker if selected.

if i m going wrong .... please correct it ...

Create a new class which inherits QItemDelegate, and override:

Quote:

---

void QItemDelegate::drawFocus ( QPainter * painter, const QStyleOptionViewItem & option, const QRect & rect ) const [virtual protected]
Renders the region within the rectangle specified by rect, indicating that it has the focus, using the given painter and style option.

---

At simplest possible, the implementation of drawFocus() could look something like this:

Code:

---

void GridDelegate::drawFocus(QPainter* painter, const QStyleOptionViewItem &option, const QRect &rect) const
{
	if (option.state & QStyle::State_HasFocus)
	{
		QPen pen(Qt::black);
		pen.setWidth(3);
		painter->setPen(pen);
		painter->drawRect(rect);
	}
}

---

Note: above code snippet is just a dummy example for you to get started. I suggest you to take a quick look at QItemDelegate sources, there you will get a neat reference from.. :)

Then, for example in the constructor of Grid, you would set the item delegate to the one you created:

Code:

---

setItemDelegate(new GridDelegate(this));

---

hi jpn,
today i m finally done with the border highlighting part. Thanks a lot for help.

But there is one more thing that is happening. i want that only the border is highlighted and not the background turns blue. i used the paint function and overrided it in my class's .cpp file. now one problem occurs.
the paint function paints the table created to white and not the color i selected. also it suppresses the effect of the drawFocus function and no focus is seen in the table.

i tried using palette in the table but can't make it work.

can u suggest somethng in that.

my code is as follows.

Code:

---

//griddelegate.h
class GridDelegate : public QItemDelegate 
{
 
public:
 
	GridDelegate(QObject *parent = 0);
 
	void drawFocus(QPainter* painter, 
			const QStyleOptionViewItem &option, 
		const QRect &rect) const;
 
	void paint(QPainter * painter, 
			const QStyleOptionViewItem & option, 
				const QModelIndex & index ) const;
 
 
};

---

Code:

---

//griddelegate.cpp
 
#include <QtGui>
#include <GridDelegate.h>
 
GridDelegate::GridDelegate(QObject *parent) : QItemDelegate(parent)
{
 
}
 
void GridDelegate::paint(QPainter * painter, 
			const QStyleOptionViewItem & option, 
				const QModelIndex & index ) const
{
 
	if (option.state & QStyle::State_Selected)
	{	
		QBrush brsh(Qt::red);
		painter->setBrush(brsh);
	}
	else if (option.state & QStyle::State_HasFocus)
	{
		QBrush brsh1(Qt::red);
		painter->setBrush(brsh1);
	}
 
}
 
void GridDelegate::drawFocus(QPainter* painter, 
							 const QStyleOptionViewItem &option, 
							 const QRect &rect) const
 
{
    if (option.state & QStyle::State_HasFocus)
 
    {
 
        QPen pen(Qt::black);
 
        pen.setWidth(3);
 
        painter->setPen(pen);
 
        painter->drawRect(rect);
 
    } else
		if (option.state & QStyle::State_Active)
 
    {
 
        QPen pen(Qt::green);
 
        pen.setWidth(5);
 
        painter->setPen(pen);
 
        painter->drawRect(rect);
 
    } else
		if (option.state & QStyle::State_KeyboardFocusChange)
 
    {
 
        QPen pen(Qt::black);
 
        pen.setWidth(5);
 
        painter->setPen(pen);
 
        painter->drawRect(rect);
 
    }
}

---

in the constructor of my main program, i merely call the setItemDelegate function as suggested by u.

Thanx buddy... i was able to set the background color by using palette.... thanx a lot ...:D

one more problem jpn,

i want to set one cell, say (0,0), as default if the form opens. i was able to set focus on the cell by function, setCurrentCell(0,0), but not able to draw that default focus (thicken the boundry) how can it be done ??

http://img99.imageshack.us/img99/1673/temp3dv.th.jpg


Right now the window looks like above ... as i select the events in the left pane .... the table in the right pane opens up with the cell (0,0) selected ... it is indicated by the blue color.... as i had changed the palette ... now when i want the boundry of the selected cell must also get thick, as it is the behaviour i had made on click of mouse or selection by keyboard.

please help....

Try setting the focus to your table widget during the startup:

Code:

---

table->setFocus(Qt::ActiveWindowFocusReason);

---

thanx jpn,
it works now by with setCurrentCell ...:p