[Qt-interest] Animated QProgressBar in a QTableView

[Brad Howes]

On Sep 1, 2010, at 6:54 PM, Omar AKHAM wrote:

> Hi,
> 
> In QtDesigner, putting a QProgressBar and setting it's min = max = 0, the result is an animated QProgressBar (look like a WaitingBar without progression). How to have it in a QTableView (using a custom delegate) ? I tried to do it, but the ProgressBar is not animated.


Are you emitting the dataChanged() signal from you model so that your row updates and calls your delegate? I've added a simple loading progress bar to a playback utility that works fine, but I just do a QPainter::fill() in the row's rectangle to show the percentage loaded:

void
NameItemDelegate::paint( QPainter* painter, const QStyleOptionViewItem& option,
			
const QModelIndex& index ) const
{
    const FileModel* model = static_cast<const FileModel*>( index.model() );
    const Emitter* emitter = model->getEmitter( index.row() );
    double loadPercentage = emitter->getLoadPercentage();
    if ( loadPercentage ) {
	
QRect rect = option.rect;
	
rect.setWidth( rect.width() * loadPercentage );
	
painter->fillRect( rect, option.palette.highlight() );
    }
    Super::paint( painter, option, index );
}

The loading happens in separate threads (one for each playback channel). The loading thread periodically emits a signal to indicate progress, which ultimate results in the model's dataChanged() signal firing causing the row associated with the loader to redisplay.

Brad

-- 
Brad Howes
Group 42
MIT Lincoln Laboratory • 244 Wood St. • Lexington, MA 02173
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