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10630476
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0
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9
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2012-05-17T05:46:32.020
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2012-05-22T07:03:31.783
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2012-05-22T07:03:31.783
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447144
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447144
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10630360
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2
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7
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text
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You should use <a href="http://doc.qt.nokia.com/4.7-snapshot/stylesheet-reference.html" rel="nofollow">Qt Style Sheet</a>, which allows us to customize UI of many controls to give unique look and feel across platforms. <a href="http://doc.qt.nokia.com/4.7-snapshot/stylesheet-examples.html#customizing-qprogressbar" rel="nofollow">Check this</a>. Create a new simple Qt Gui project, open UI Form editor and add a Progress Bar control from under 'Display Widgets' in tool window. Now write following code in constructor of <code>MainWindow</code>.. <pre><code>MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); // Customize progress-bar's style.. QString style = "QProgressBar {border: 2px solid grey; border-radius: 5px; text-align: center;}"; style += "QProgressBar::chunk {background-color: #CD96CD; width: 10px; margin: 0.5px;}"; // Assuming objectName is 'progressBar'.. ui->progressBar->setStyleSheet(style); } </code></pre> Compile and run. If you just want to change that single <code>QProgressBar</code> control, then above method is sufficient, but if you want to apply styles at application level (say all <code>QProgressBar</code> controls and some other controls), then proper way is to create a <code>*.css</code> file, write styles using <a href="http://doc.qt.nokia.com/4.7-snapshot/stylesheet-reference.html" rel="nofollow">Qt Style Sheet Reference</a> and then read that file in Qt and call <code>QApplication::setStyleSheet(QString style)</code>. Besides, style sheet uses the same syntax as CSS and also supports various selectors. Edit: I agree that above method works only with controls and not delegates. I found something for delegates also. Try following <code>paint</code> function. <pre><code>void ProgressBarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const { if (index.column() == 2) { QProgressBar renderer; int progressPercentage = index.model()->data(index, Qt::DisplayRole).toInt(); // Customize style using style-sheet.. QString style = "QProgressBar { border: 2px solid grey; border-radius: 5px; }"; style += "QProgressBar::chunk { background-color: #05B8CC; width: 20px; }"; renderer.resize(option.rect.size()); renderer.setMinimum(0); renderer.setMaximum(100); renderer.setValue(progressPercentage); renderer.setStyleSheet(style); painter->save(); painter->translate(option.rect.topLeft()); renderer.render(painter); painter->restore(); } else QStyledItemDelegate::paint(painter, option, index); } </code></pre> So here the point is that instead of using <code>QStyleOption</code>, we can use directly the control itself as a renderer. Hope this helps..
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