NavigationSplitView.setSidebarWidthFraction
void setSidebarWidthFraction(double fraction)Sets the preferred sidebar width as a fraction of the total width of self.
The preferred width is additionally limited by propertyNavigationSplitView:min-sidebar-width and propertyNavigationSplitView:max-sidebar-width.
The sidebar widget can be allocated with larger width if its own minimum width exceeds the preferred width.
Parameters
fraction | the preferred width fraction |