Maybe I wasn't clear: the second item has the longest string and I would expect the QTreeWidget to grow to show the whole string.
I added an example with the content of the QTreeWidget.
Any ideas why it doesn't resize to the longest string?


Qt Code: 
  1. #include <QVBoxLayout>
  2. #include <QLineEdit>
  3. #include <QTreeWidget>
  4. #include <QLineEdit>
  5. #include <QTreeWidget>
  6.  
  7. MyWidget::MyWidget(QWidget *parent)
  8. 	: QWidget(parent)
  9. {
  10. 	setWindowFlags(Qt::Popup | Qt::FramelessWindowHint);
  11.  
  12. 	QVBoxLayout *vBoxLayout = new QVBoxLayout(this);
  13. 	vBoxLayout->setContentsMargins(1, 1, 0, 0);
  14. 	QLineEdit *mLineEdit = new QLineEdit;
  15.  
  16. 	vBoxLayout->addWidget(mLineEdit);
  17.  
  18. 	QTreeWidget *treeWidget = new QTreeWidget;
  20. 	item->setText(0, "The quick brown fox jumps over the lazy dog");
  21. 	treeWidget->addTopLevelItem(item);
  23. 	item2->setText(0, "The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog");
  24. 	treeWidget->addTopLevelItem(item2);
  26. 	item3->setText(0, "The quick brown");
  27. 	treeWidget->addTopLevelItem(item3);
  28.  
  29.  
  30. 	treeWidget->setWindowFlags(Qt::Popup);
  31. 	treeWidget->setFocusPolicy(Qt::NoFocus);
  32. 	treeWidget->setMouseTracking(true);
  33. 	treeWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  34.  
  35. 	treeWidget->setColumnCount(1);
  36. 	treeWidget->setUniformRowHeights(true);
  37. 	treeWidget->setRootIsDecorated(false);
  38. 	treeWidget->setEditTriggers(QTreeWidget::NoEditTriggers);
  39. 	treeWidget->setSelectionBehavior(QTreeWidget::SelectRows);
  40. 	treeWidget->setFrameStyle(QFrame::Box | QFrame::Plain);
  41. 	treeWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  42. 	treeWidget->header()->hide();
  43. 	treeWidget->resizeColumnToContents(0);
  44.  
  45. 	mLineEdit->installEventFilter(this);
  46. 	vBoxLayout->addWidget(treeWidget);
  47. 	connect(mLineEdit, SIGNAL(textChanged(const QString&)), this, SLOT(updateList(const QString&)));
  48. 	connect(treeWidget, SIGNAL(itemClicked( QTreeWidgetItem*, int)), SLOT(updateLineEdit(QTreeWidgetItem*, int)));
  49. 	move(QCursor::pos());
  50. 	show();
  51. 	mLineEdit->setFocus();
  52. 	setLayout(vBoxLayout);
  53. 	layout()->setSizeConstraint(QLayout::SetFixedSize);
  54. }
To copy to clipboard, switch view to plain text mode