QSize QDockWidgetLayout::sizeFromContent(const QSize &content, bool floating) const { QSize result = content; if (verticalTitleBar) { result.setHeight(qMax(result.height(), minimumTitleWidth())); result.setWidth(qMax(content.width(), 0)); } else { result.setHeight(qMax(result.height(), 0)); result.setWidth(qMax(content.width(), minimumTitleWidth())); } QDockWidget *w = qobject_cast<QDockWidget*>(parentWidget()); const bool nativeDeco = nativeWindowDeco(floating); int fw = floating && !nativeDeco ? w->style()->pixelMetric(QStyle::PM_DockWidgetFrameWidth, 0, w) : 0; const int th = titleHeight(); if (!nativeDeco) { if (verticalTitleBar) result += QSize(th + 2*fw, 2*fw); else result += QSize(2*fw, th + 2*fw); } result.setHeight(qMin(result.height(), (int) QWIDGETSIZE_MAX)); result.setWidth(qMin(result.width(), (int) QWIDGETSIZE_MAX)); if (content.width() < 0) result.setWidth(-1); if (content.height() < 0) result.setHeight(-1); int left, top, right, bottom; w->getContentsMargins(&left, &top, &right, &bottom); //we need to substract the contents margin (it will be added by the caller) QSize min = w->minimumSize() - QSize(left + right, top + bottom); QSize max = w->maximumSize() - QSize(left + right, top + bottom); /* A floating dockwidget will automatically get its minimumSize set to the layout's minimum size + deco. We're *not* interested in this, we only take minimumSize() into account if the user set it herself. Otherwise we end up expanding the result of a calculation for a non-floating dock widget to a floating dock widget's minimum size + window decorations. */ uint explicitMin = 0; uint explicitMax = 0; if (w->d_func()->extra != 0) { explicitMin = w->d_func()->extra->explicitMinSize; explicitMax = w->d_func()->extra->explicitMaxSize; } if (!(explicitMin & Qt::Horizontal) || min.width() == 0) min.setWidth(-1); if (!(explicitMin & Qt::Vertical) || min.height() == 0) min.setHeight(-1); if (!(explicitMax & Qt::Horizontal)) max.setWidth(QWIDGETSIZE_MAX); if (!(explicitMax & Qt::Vertical)) max.setHeight(QWIDGETSIZE_MAX); return result.boundedTo(max).expandedTo(min); }