Qt-interest Archive, December 2006
Updating QTableItem's the smart way
Message 1 in thread
Pretty sure I'm doing this right.
I've got a subclassed QTableItem, which I use to change the font style &
color, etc.
If the status of the cell changes (which would warrant a different
color), I simply delete the QTableItem and create a new one w/ the right
colors. Seems like a roundabout way to do it, but I can't think of any
other way.
table_item::table_item( QTable* t, EditType et, QColor c, QColor f,
const QString txt ) : QTableItem( t, et, txt )
{
color = c;
fnt_color = f;
text = txt;
}
table_item::~table_item()
{
}
int table_item::alignment() const
{
return Qt::AlignLeft;
}
void table_item::paint( QPainter* p, const QColorGroup &cg, const QRect
&cr, bool selected )
{
QColorGroup g(cg);
QColor txt_c( 255, 255, 255 );
// txt_c.setNamedColor( "FFFFFF" );
g.setColor( QColorGroup::Base, color );
g.setColor( QColorGroup::Text, fnt_color );
p->setPen( Qt::white );
QFont f( "Tahoma", 10, QFont::Bold );
p->setFont( f );
QTableItem::paint( p, g, cr, selected );
}
This is essentially how I create a cell:
void trdview::insert_cell( int col, QString t, int trd )
{
QPainter p( tbl );
QColorGroup cg;
cg.setColor( QColorGroup::Background, Qt::red );
cg.setColor( QColorGroup::Text, Qt::green );
QRect rect = tbl->cellRect( 0, col );
QColor c( 232, 232, 232 );
c.setNamedColor( "#003366" );
QColor f( 255, 255, 255 );
table_item *temp;
temp = new table_item( tbl, QTableItem::Never, c, f, t );
temp->paint( &p, cg, rect, FALSE );
tbl->setItem( 0, col, temp );
}
and an update one:
void trdview::update_cell( int row, int col, QString t, int trd )
{
QPainter p( tbl );
QColorGroup cg;
cg.setColor( QColorGroup::Background, Qt::red );
cg.setColor( QColorGroup::Text, Qt::green );
QRect rect = tbl->cellRect( row, col );
QColor c( 0, 0, 0 );
c.setNamedColor( "#003366" ); // couldn't find the RGB code,
use HEX
QColor f( 255, 255, 255 );
f.setNamedColor( "#FFFF66" ); // couldn't find the RGB code,
use HEX
QTableItem *old = tbl->item( row, col );
tbl->takeItem( old );
delete old;
table_item *temp;
temp = new table_item( tbl, QTableItem::Never, c, f, t );
temp->paint( &p, cg, rect, FALSE );
tbl_trades->setItem( row, col, temp );
}
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Message 2 in thread
Paul England a écrit :
> Pretty sure I'm doing this right.
> I've got a subclassed QTableItem, which I use to change the font style &
> color, etc.
> If the status of the cell changes (which would warrant a different
> color), I simply delete the QTableItem and create a new one w/ the right
> colors. Seems like a roundabout way to do it, but I can't think of any
> other way.
>
> table_item::table_item( QTable* t, EditType et, QColor c, QColor f,
> const QString txt ) : QTableItem( t, et, txt )
> {
> color = c;
> fnt_color = f;
> text = txt;
> }
>
> table_item::~table_item()
> {
>
> }
>
> int table_item::alignment() const
> {
> return Qt::AlignLeft;
> }
>
> void table_item::paint( QPainter* p, const QColorGroup &cg, const QRect
> &cr, bool selected )
> {
> QColorGroup g(cg);
> QColor txt_c( 255, 255, 255 );
> // txt_c.setNamedColor( "FFFFFF" );
>
> g.setColor( QColorGroup::Base, color );
> g.setColor( QColorGroup::Text, fnt_color );
>
> p->setPen( Qt::white );
> QFont f( "Tahoma", 10, QFont::Bold );
> p->setFont( f );
> QTableItem::paint( p, g, cr, selected );
> }
>
> This is essentially how I create a cell:
>
> void trdview::insert_cell( int col, QString t, int trd )
> {
> QPainter p( tbl );
> QColorGroup cg;
> cg.setColor( QColorGroup::Background, Qt::red );
> cg.setColor( QColorGroup::Text, Qt::green );
>
> QRect rect = tbl->cellRect( 0, col );
> QColor c( 232, 232, 232 );
> c.setNamedColor( "#003366" );
>
> QColor f( 255, 255, 255 );
>
> table_item *temp;
> temp = new table_item( tbl, QTableItem::Never, c, f, t );
> temp->paint( &p, cg, rect, FALSE );
> tbl->setItem( 0, col, temp );
> }
>
> and an update one:
>
> void trdview::update_cell( int row, int col, QString t, int trd )
> {
> QPainter p( tbl );
> QColorGroup cg;
> cg.setColor( QColorGroup::Background, Qt::red );
> cg.setColor( QColorGroup::Text, Qt::green );
>
> QRect rect = tbl->cellRect( row, col );
> QColor c( 0, 0, 0 );
> c.setNamedColor( "#003366" ); // couldn't find the RGB code,
> use HEX
> QColor f( 255, 255, 255 );
> f.setNamedColor( "#FFFF66" ); // couldn't find the RGB code,
> use HEX
>
> QTableItem *old = tbl->item( row, col );
> tbl->takeItem( old );
> delete old;
>
> table_item *temp;
> temp = new table_item( tbl, QTableItem::Never, c, f, t );
> temp->paint( &p, cg, rect, FALSE );
> tbl_trades->setItem( row, col, temp );
> }
Hi,
Why don't you just add a method to your own table item class
implementation?
You could just do the following once done:
table_item *cell = dynamic_cast<table_item*>(tbl->item(row, col));
if(cell)
cell->setNewColors(color, fontColor);
BTW, why are you calling those paints on the newly created cells? I
don't see their use -but maybe I missed something, sorry in this case ;)
Regards,
Denys
PS Sorry for the spam Paul, I forgot to answer to the qt-interest :-/
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