+ // Only show scrollbar if the content goes beyond the visible area
+ if (widgetSize.height() > areaSize.height()) {
+ verticalScrollBar()->setEnabled(true);
+ verticalScrollBar()->setPageStep(areaSize.height() / charHeight_);
+ verticalScrollBar()->setRange(0, ((widgetSize.height() - areaSize.height())) / charHeight_ + 1);
+ } else
+ verticalScrollBar()->setEnabled(false);
+
+ // Fill widget background
+ painter.fillRect(event->rect(), palette().color(QPalette::Base));
+
+ if (!data_ || (data_size_ == 0)) {
+ painter.setPen(palette().color(QPalette::Text));
+ QString s = tr("No data available");
+ int x = (areaSize.width() - fontMetrics().boundingRect(s).width()) / 2;
+ int y = areaSize.height() / 2;
+ painter.drawText(x, y, s);
+ return;
+ }
+
+ // Determine first/last line indices