I have a widget with a QLineEdit and a QTreeWidget in a QVBoxLayout. I would like to size MyWidget to adjust to the longest string in the treeWidget.
Do I need to override sizeHint() or can qt do it somehow? When I type in the QLineEdit, it automatically adjusts the items in QTreeWidget.

Qt Code: 
  1. MyWidget::MyWidget(QWidget *parent) : QWidget(parent)
  2. {
  3. 	setWindowFlags(Qt::Popup | Qt::FramelessWindowHint);
  4.  
  5. 	QVBoxLayout *vBoxLayout = new QVBoxLayout(this);
  6. 	vBoxLayout->setContentsMargins(1, 1, 0, 0);
  7. 	mLineEdit = new QLineEdit;
  8.  
  9. 	vBoxLayout->addWidget(mLineEdit);
  10.  
  11. 	mTreeWidget = new MyTreeWidget;
  12. 	mTreeWidget->setWindowFlags(Qt::Popup);
  13. 	mTreeWidget->setFocusPolicy(Qt::NoFocus);
  14. 	mTreeWidget->setMouseTracking(true);
  15. 	mTreeWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  16.  
  17. 	mTreeWidget->setColumnCount(1);
  18. 	mTreeWidget->setUniformRowHeights(true);
  19. 	mTreeWidget->setRootIsDecorated(false);
  20. 	mTreeWidget->setEditTriggers(QTreeWidget::NoEditTriggers);
  21. 	mTreeWidget->setSelectionBehavior(QTreeWidget::SelectRows);
  22. 	mTreeWidget->setFrameStyle(QFrame::Box | QFrame::Plain);
  23. 	mTreeWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  24. 	mTreeWidget->header()->hide();
  25.         mTreeWidget->resizeColumnToContents(0);
  26.  
  27. 	mLineEdit->installEventFilter(this);
  28. 	vBoxLayout->addWidget(mTreeWidget);
  29. 	connect(mLineEdit, SIGNAL(textChanged(const QString&)), this, SLOT(updateList(const QString&)));
  30. 	connect(mTreeWidget, SIGNAL(itemClicked( QTreeWidgetItem*, int)), SLOT(updateLineEdit(QTreeWidgetItem*, int)));
  31. 	move(QCursor::pos());
  32. 	show();
  33. 	mLineEdit->setFocus();
  34. 	setLayout(vBoxLayout);
  35. 	layout()->setSizeConstraint(QLayout::SetFixedSize);
  36. }
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