No fill option in QColorDialog

[Qt Enthusiast]

When I click on the empty boxes in Custom color . it is changing to white . Am I missing something

[raven-worx]

@mrjj
ok, so meaning transparency?

This should be somewhat possible with:

colorDialog->setOption( QColorDialog::ShowAlphaChannel, true );

[mrjj]

@raven-worx
No, it means set to no color.
Like if for painter, then clear the fill color so it dont fill. ( is my guess :)

[Qt Enthusiast]

if i have square in QGraphicsView and if I use this no color , the fill color of box should be set to its background just like clearing the box color fill color . Am I clear or shall I send a image for the same

[mrjj]

@Qt-Enthusiast
Those white colors are custom colors :)
Its not for no color.

[raven-worx]

@mrjj
and whats the difference between "no fill" and "transparancy" then?!

[mrjj]

@raven-worx
You are right,
its should give same effect ?

But im not sure user will intuitively think, "ahh
if i lower Alpha to zero, it get rid of fill" :)

[Qt Enthusiast]

Can someone write the code

[mrjj]

@Qt-Enthusiast
Hi
@raven-worx showed you what to add to your color dialog.
colorDialog->setOption( QColorDialog::ShowAlphaChannel, true );
Then you get Alpha value.
User can set to zero and you get a transparent color which should look the same as no color.

[Qt Enthusiast]

This is my code
can some one guide me how to do it here

connect(this, SIGNAL(clicked(const QModelIndex&)), this, SLOT(clickedActivated(const QModelIndex&)));
}

void myView::clickedActivated(const QModelIndex& index)
{
if (index.column() == 1 ) {
QColorDialog* colorDialog = new QColorDialog;
colorDialog->setOption(QColorDialog::ShowAlphaChannel, true );
QColor color = QColorDialog::getColor();
d_model->setData(index,color,Qt::DecorationRole);

}

as I am getting compiltation error

[raven-worx]

@Qt-Enthusiast

QColorDialog colorDialog;
colorDialog.setOption(QColorDialog::ShowAlphaChannel, true );
colorDialog.exec();
QColor color = colorDialog.getColor();
if( color.isValid() )
   d_model->setData(index,color,Qt::DecorationRole);

[Qt Enthusiast]

I am using qt.4.3.3 I am getting following compliation error

error: ?class QColorDialog? has no member named ?setOption?
colorDialog.setOption(QColorDialog::ShowAlphaChannel, true );
error: ?ShowAlphaChannel? is not a member of ?QColorDialog?
colorDialog.setOption(QColorDialog::ShowAlphaChannel, true );

my code is

void myInstView::clickedActivated(const QModelIndex& index)
{
if (index.column() == 1 ) {
QColorDialog colorDialog;
colorDialog.setOption(QColorDialog::ShowAlphaChannel, true );
colorDialog.exec();
QColor color = colorDialog.getColor();
if( color.isValid() )
model->setData(index,color,Qt::DecorationRole);
}

}
}

[raven-worx]

@Qt-Enthusiast
it seems it is only available since Qt 4.5

[Qt Enthusiast]

Can there be any alternative to it

[mrjj]

@Qt-Enthusiast
Nope.
Fast way is to make new button or menu
that clear the color on the selected item.