No Keyboard input if QLineEdit on frameless popup window - qt

Question

When a parent widget is defined with:
setWindowFlags(Qt::FramelessWindowHint | Qt::Popup);
Any edit box widget placed on top of it will not receive keyboard input. Mouse will work, right click, context menu, paste will work -- but not direct keyboard input. Any ideas why and how it can be fixed?

Answer 1

As I mentioned previously in a comment I had the same problem but now it is fixed with the following code:
// virtual override
void MyDialog::showEvent( QShowEvent* aShowEvent )
{
QDialog::showEvent( aShowEvent );
activateWindow();
}
After I added the activateWindow() function call I could use QLineEdit on my popup dialog.
I use Visual Studio 2013 and Qt 5.4.1 on Windows 8.1.

Answer 2

#include "StdAfx.h"
#include "qfindedit.h"
QFindEdit::QFindEdit(QWidget *parent)
: QLineEdit(parent)
, m_bEditFocus(true)
{
setPlaceholderText("please input find word");
m_stringListmodel = new QStringListModel(this);
m_pFindWnd = new QListView(this);
//m_pFindWnd->setWindowFlags(Qt::Popup);
m_pFindWnd->setEditTriggers(QAbstractItemView::NoEditTriggers);
m_pFindWnd->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
m_pFindWnd->setSelectionBehavior(QAbstractItemView::SelectRows);
m_pFindWnd->setSelectionMode(QAbstractItemView::SingleSelection);
m_pFindWnd->setParent(0, Qt::Popup);
m_pFindWnd->setFocusPolicy(Qt::NoFocus);
m_pFindWnd->setFocusProxy(this);
connect(this, SIGNAL(textEdited(const QString&)), this, SLOT(textEditedSlot(const QString&)));
QObject::connect(m_pFindWnd, SIGNAL(clicked(QModelIndex)),
this, SLOT(clickedSlot(QModelIndex)));
QObject::connect(this, SIGNAL(activated(QModelIndex)),
m_pFindWnd, SLOT(hide()));
this->installEventFilter(this);
m_pFindWnd->installEventFilter(this);
}
QFindEdit::~QFindEdit()
{
delete m_pFindWnd;
}
QStringList& QFindEdit::stringList()
{
return m_stringList;
}
void QFindEdit::showFindWnd(const QString& text)
{
QStringList sl;
foreach(QString word, m_stringList) {
if (word.contains(text)) {
sl << word;
}
}
if (sl.size() == 0)
{
hideFineWnd();
return;
}
m_stringListmodel->setStringList(sl);
m_pFindWnd->setModel(m_stringListmodel);
m_pFindWnd->resize(rect().width(), 200);
QPoint pTopleft = mapToGlobal(rect().bottomLeft());
m_pFindWnd->move(pTopleft.x(), pTopleft.y());
m_pFindWnd->show();
}
void QFindEdit::textEditedSlot(const QString& text)
{
QString strText = text.trimmed();
if (!strText.isEmpty())
{
showFindWnd(strText);
}
else
{
hideFineWnd();
}
}
void QFindEdit::clickedSlot(QModelIndex modelIndex)
{
setText(m_pFindWnd->model()->data(modelIndex).toString());
hideFineWnd();
}
void QFindEdit::hideFineWnd()
{
m_pFindWnd->hide();
}
bool QFindEdit::eventFilter(QObject *o, QEvent *e)
{
if (m_bEditFocus && (o == this) && e->type() == QEvent::FocusOut)
{
if (m_pFindWnd && m_pFindWnd->isVisible())
return true;
}
if (o != m_pFindWnd)
return __super::eventFilter(o, e);
switch (e->type())
{
case QEvent::KeyPress:
{
QKeyEvent *ke = static_cast<QKeyEvent *>(e);
QModelIndex curIndex = m_pFindWnd->currentIndex();
QModelIndexList selList = m_pFindWnd->selectionModel()->selectedIndexes();
const int key = ke->key();
if ((key == Qt::Key_Up || key == Qt::Key_Down) && selList.isEmpty() && curIndex.isValid() )
{
m_pFindWnd->setCurrentIndex(curIndex);
return true;
}
switch (key)
{
case Qt::Key_End:
case Qt::Key_Home:
if (ke->modifiers() & Qt::ControlModifier)
return false;
break;
case Qt::Key_Up:
if (!curIndex.isValid())
{
int rowCount = m_pFindWnd->model()->rowCount();
QModelIndex lastIndex = m_pFindWnd->model()->index(rowCount - 1, m_pFindWnd->modelColumn());
m_pFindWnd->setCurrentIndex(lastIndex);
return true;
}
else if (curIndex.row() == 0)
{
return true;
}
return false;
case Qt::Key_Down:
if (!curIndex.isValid())
{
QModelIndex firstIndex = m_pFindWnd->model()->index(0, m_pFindWnd->modelColumn());
m_pFindWnd->setCurrentIndex(firstIndex);
return true;
}
else if (curIndex.row() == m_pFindWnd->model()->rowCount() - 1)
{
return true;
}
return false;
}
m_bEditFocus = false;
this->event(ke);
m_bEditFocus = true;
if ( e->isAccepted() || !m_pFindWnd->isVisible()) {
if (!this->hasFocus())
hideFineWnd();
if (e->isAccepted())
return true;
}
switch (key)
{
case Qt::Key_Return:
case Qt::Key_Enter:
case Qt::Key_Tab:
hideFineWnd();
if (curIndex.isValid())
{
QString text = m_pFindWnd->currentIndex().data().toString();
setText(text);
}
break;
case Qt::Key_F4:
if (ke->modifiers() & Qt::AltModifier)
hideFineWnd();
break;
case Qt::Key_Backtab:
case Qt::Key_Escape:
hideFineWnd();
break;
default:
break;
}
return true;
}
case QEvent::MouseButtonPress:
if (!m_pFindWnd->underMouse())
{
hideFineWnd();
return true;
}
return false;
case QEvent::InputMethod:
case QEvent::ShortcutOverride:
QApplication::sendEvent(this, e);
break;
default:
return false;
}
return false;
}

Answer 3

Maybe try activating the window and/or setting widget focus?