How to show progess in a QTreeView item ?

[wysota]

There is no real progressbar. But you can access the value displayed using a line similar to this one:

int progress = index.data(Qt::DisplayRole).toInt();

int progress = index.data(Qt::DisplayRole).toInt();

To copy to clipboard, switch view to plain text mode 

In your case you might want to substitute index with item approach receiving:

int progress = item->data(Qt::DisplayRole).toInt();

int progress = item->data(Qt::DisplayRole).toInt();

To copy to clipboard, switch view to plain text mode 

[coderbob]

Thank you for the response Wysota,

So if I wanted to update it continuously with progress I would need to access it with?

item->setData(1,Qt::DisplayRole,updatingValue);

item->setData(1,Qt::DisplayRole,updatingValue);

To copy to clipboard, switch view to plain text mode 

Bob

[wysota]

Yes, that's correct.

[coderbob]

Using the example from jpn I call

tree.topLevelItem(1)->setData(1,Qt::DisplayRole,50);

tree.topLevelItem(1)->setData(1,Qt::DisplayRole,50);

To copy to clipboard, switch view to plain text mode 

and then

qDebug() << tree.topLevelItem(1)->data(1,Qt::DisplayRole).toInt();

qDebug() << tree.topLevelItem(1)->data(1,Qt::DisplayRole).toInt();

To copy to clipboard, switch view to plain text mode 

to confirm the value has changed but I do not get an update in the GUI displayed progress column. Do I need to also call a repaint or some other event?

Bob

[jpn]

The example generates dummy progress values. Substitute

int progress = (index.row() != 0 ? 100 / index.row() : 0);

int progress = (index.row() != 0 ? 100 / index.row() : 0);

To copy to clipboard, switch view to plain text mode 

with

int progress = index.data(Qt::DisplayRole).toInt();

int progress = index.data(Qt::DisplayRole).toInt();

To copy to clipboard, switch view to plain text mode 

in ItemDelegate::paint().

[coderbob]

Thank you Wysota and jpn,

One last question on this subject, in jpn's example the maximum size is set

opt.maximum = 100;

opt.maximum = 100;

To copy to clipboard, switch view to plain text mode 

Is there a way to set a different maximum for each item?

Bob

[jpn]

You could use for example custom roles. Qt::UserRole is the first role that can be used for application-specific purposes:

// define custom roles
const int MinimumRole = Qt::UserRole;
const int MaximumRole = MinimumRole + 1;
 
// set data for custom roles
item->setData(column, MinimumRole, minimum);
item->setData(column, MaximumRole, maximum);
 
// get data for custom roles
opt.minimum = index.data(MinimumRole).toInt();
opt.maximum = index.data(MaximumRole).toInt();

// define custom roles
const int MinimumRole = Qt::UserRole;
const int MaximumRole = MinimumRole + 1;

// set data for custom roles
item->setData(column, MinimumRole, minimum);
item->setData(column, MaximumRole, maximum);

// get data for custom roles
opt.minimum = index.data(MinimumRole).toInt();
opt.maximum = index.data(MaximumRole).toInt();

To copy to clipboard, switch view to plain text mode 

[wysota]

You could even add a ValueRole and then use DisplayRole for something else (like displaying some text).

[fruzzo]

the examples in this 3D are about Qt4, is it? there is a way to do the same thing (a progress bar in a colum of a QListView) for Qt 3.3.5?

[marcel]

Yes, the thread is about Qt 4.
In Qt 3 you cannot do it like that. You can instead subclass QListViewItem and paint the progress yourself.
See Q3ListViewItem::paintCell()

[fruzzo]

Yes, the thread is about Qt 4.
In Qt 3 you cannot do it like that. You can instead subclass QListViewItem and paint the progress yourself.
See Q3ListViewItem::paintCell()

ok thanxs...do you know if there are some examples about this?

[marcel]

Well, no examples that I know of, but you can play with it.
Basically you could keep the progress value in your item subclass and just consider it when doing the repainting. It shouldn't be that hard - you have the painter, the width and height of the cell... Just paint a rectangle with the width of progressValue*cellWidth/100 in the cell.

[fruzzo]

Well, no examples that I know of, but you can play with it.
Basically you could keep the progress value in your item subclass and just consider it when doing the repainting. It shouldn't be that hard - you have the painter, the width and height of the cell... Just paint a rectangle with the width of progressValue*cellWidth/100 in the cell.

well...I modified the paincell for myListyViewItem to create a progress bar like I want.
now I want update the progress bar for each row of the list every 1 second.
Any idea to do this ask???
I thought to create for each item a qtimer that every second update ther percent of the progress and call the paintcell but I don't know how call well the paintcell function.

[marcel]

I thought to create for each item a qtimer that every second update ther percent of the progress a call the paintcell but I don't know how call well the paintcell function.

That's not really good. Why not create a single timer, on whose timeout() you will update all items.
You can call either one of the Q3ListView::updateContents() functions or Q3ListView::repaintItem() for all items.

[fruzzo]

That's not really good. Why not create a single timer, on whose timeout() you will update all items.
You can call either one of the Q3ListView::updateContents() functions or Q3ListView::repaintItem() for all items.

ok ... I try...and now that I have a myListViewItem how can I iterate the listview to modify each item? The QLIstViewItemIterator is seem to don't work.

[marcel]

ok ... I try...and now that I have a myListViewItem how can I iterate the listview to modify each item? The QLIstViewItemIterator is seem to don't work.

How come it doesn't work?
This is the example from Assistant:

QList<Q3ListViewItem *> lst;
 Q3ListViewItemIterator it(myListView);
 while (it.current()) {
     if (it.current()->isSelected())
         lst.append(it.current());
     ++it;
 }

QList<Q3ListViewItem *> lst;
 Q3ListViewItemIterator it(myListView);
 while (it.current()) {
     if (it.current()->isSelected())
         lst.append(it.current());
     ++it;
 }

To copy to clipboard, switch view to plain text mode 

So, it pretty much should work.

[THRESHE]

It appears that style sheets can not be used with QItemDelegate. Is it so ? If it is how can I apply styles to my widgets ?
Thanks

[jpn]

It appears that style sheets can not be used with QItemDelegate. Is it so ?

That's right, unfortunately. Luckily Qt 4.4 will introduce QStyledItemDelegate.

[THRESHE]

But QStyle can be used for styling or not ? And if it can is it much harder to use QStyle instead style sheets ? Thanks

[jpn]

But QStyle can be used for styling or not ? And if it can is it much harder to use QStyle instead style sheets ?

Sure it can. Well, writing a custom QStyle subclass is same as painting stuff by hand whereas style sheets are way more abstract way to style applications. I suggest you take a sneak peak to src/gui/styles/qxxxstyle.cpp what it looks like to implement a custom style.