Focus on a QWidget item in a QWidget

[vycke]

I can't believe no one has asked about this (or at least that I couldn't find it)... but let's see if someone can give me an answer

I have a QDialog with a QFrame on it (and a QDialogButtonBox, and a few other widgets). When I try to place a QWidget "in" the frame (setParent(frame)) and show it (note: under Windows I have to have a move(0,0) for the widget or else the widgets start sliding down and to the right until it hits a certain point, then resets), the widgets on the widget (i.e. a QLineEdit on the 'page') do not get the focus. I've tried page->setFocus() -- but that just allows the QDialogButtonBox to have the default button work (weird, but it doesn't work (under Linux) until I added the setFocus()). I've tried calling a function in the page to set the focus to the QLineEdit (m_name->setFocus())... still nothing.

Can anyone see an obvious solution? Or do I need to try to get a small compilable example to post first?

Thanks,

Vycke

[marcel]

Better post an example and I will answer the post by correcting it. It is easier that way.

[jacek]

I'm not sure if it's going to help with the focus problem, but it sounds like you forgot to add a layout for that frame.

[vycke]

Ok. I replaced the QFrame with a QVBoxLayout & am doing an insertWidget(0, page) (instead of just making the QFrame the parent of the page) -- even with the page->setFocus() call, it won't show.

I'm trying to make a small example to test this, but any other possible hints while I try to trim it down would be nice

Vycke

[jacek]

Maybe you set QWidget::focusPolicy to Qt::NoFocus somewhere?

[vycke]

(You'll have to put this into an app... qtest.ui is just a dialog (named QTestDlg) w/a QVBoxLayout, qname.ui is a widget (named QNameDlg) w/a QLineEdit)

testdlg.hpp

#include "ui_qtest.hpp"
 
class CTestDlg : public QDialog, private Ui::QTestDlg
{
   Q_OBJECT
 
public:
   CTestDlg(QWidget* parent = 0);
   ~CTestDlg();
 
   void addPage(QWidget* page);
};

#include "ui_qtest.hpp"

class CTestDlg : public QDialog, private Ui::QTestDlg
{
   Q_OBJECT

public:
   CTestDlg(QWidget* parent = 0);
   ~CTestDlg();

   void addPage(QWidget* page);
};

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testdlg.cpp

#include "testdlg.hpp"
 
CTestDlg::CTestDlg(QWidget* parent) : QDialog(parent)
{
   this->setupUi(this);
}
 
CTestDlg::~CTestDlg()
{
}
 
void CTestDlg::addPage(QWidget* page)
{
   if (page)
   {
      vboxLayout->insertWidget(0, page);
      page->show();
      page->setFocus(Qt::OtherFocusReason);
   }
}

#include "testdlg.hpp"

CTestDlg::CTestDlg(QWidget* parent) : QDialog(parent)
{
   this->setupUi(this);
}

CTestDlg::~CTestDlg()
{
}

void CTestDlg::addPage(QWidget* page)
{
   if (page)
   {
      vboxLayout->insertWidget(0, page);
      page->show();
      page->setFocus(Qt::OtherFocusReason);
   }
}

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and calling the above with

CTestDlg* test = new CTestDlg(this);
CNameDlg* page = new CNameDlg();
 
test->addPage(page);
test->show();

CTestDlg* test = new CTestDlg(this);
CNameDlg* page = new CNameDlg();

test->addPage(page);
test->show();

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[I hope this is enough to show what I have -- and will give some idea what I'm doing & why it isn't setting the focus on the QLineEdit]

Vycke

[vycke]

Maybe you set QWidget::focusPolicy to Qt::NoFocus somewhere?

The widgets/dialog both had Qt::NoFocus set -- but changing both to Qt::StrongFocus didn't fix this.

[jacek]

Please post a compilable example.

[vycke]

Ok.. Here's the code:

main.cpp

#include <QtGui/QApplication>
 
#include "dialog.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Dialog dialog;
    CNameDlg test;
    dialog.addPage(&test);
    return dialog.exec();
}

#include <QtGui/QApplication>

#include "dialog.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Dialog dialog;
    CNameDlg test;
    dialog.addPage(&test);
    return dialog.exec();
}

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dialog.cpp

#include <QtGui>
 
#include "dialog.h"
 
Dialog::Dialog()
{
   this->setupUi(this);
}
 
void Dialog::addPage(QWidget* page)
{
   if (page)
   {
      vboxLayout->insertWidget(0, page);
      page->show();
      page->setFocus(Qt::OtherFocusReason);
   }
}
 
CNameDlg::CNameDlg(QWidget* parent) : QWidget(parent)
{
   this->setupUi(this);
}

#include <QtGui>

#include "dialog.h"

Dialog::Dialog()
{
   this->setupUi(this);
}

void Dialog::addPage(QWidget* page)
{
   if (page)
   {
      vboxLayout->insertWidget(0, page);
      page->show();
      page->setFocus(Qt::OtherFocusReason);
   }
}

CNameDlg::CNameDlg(QWidget* parent) : QWidget(parent)
{
   this->setupUi(this);
}

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dialog.h

#ifndef DIALOG_H
#define DIALOG_H
 
#include <QtGui/QDialog>
#include <QtGui/QLabel>
#include <QtGui/QLineEdit>
#include <QtGui/QVBoxLayout>
#include <QtGui/QWidget>
 
#include <QtGui/QApplication>
 
class Dialog : public QDialog
{
    Q_OBJECT
 
public:
    Dialog();
    void addPage(QWidget* page);
 
private:
   QWidget *verticalLayout;
   QVBoxLayout *vboxLayout;
   QLabel *label;
 
   void setupUi(QDialog *Dialog)
   {
   if (Dialog->objectName().isEmpty())
      Dialog->setObjectName(QString::fromUtf8("Dialog"));
   Dialog->resize(535, 302);
   Dialog->setFocusPolicy(Qt::StrongFocus);
   verticalLayout = new QWidget(Dialog);
   verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
   verticalLayout->setGeometry(QRect(10, 30, 511, 221));
   vboxLayout = new QVBoxLayout(verticalLayout);
   vboxLayout->setObjectName(QString::fromUtf8("vboxLayout"));
   vboxLayout->setContentsMargins(0, 0, 0, 0);
   label = new QLabel(Dialog);
   label->setObjectName(QString::fromUtf8("label"));
   label->setGeometry(QRect(10, 10, 54, 18));
 
   Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", 0, QApplication::UnicodeUTF8));
   label->setText(QApplication::translate("Dialog", "Test", 0, QApplication::UnicodeUTF8));
   } // setupUi
};
 
 
class CNameDlg : public QWidget
{
   Q_OBJECT
 
public:
   CNameDlg(QWidget *parent = 0);
   QLabel *label;
   QLineEdit *m_name;
 
   void setupUi(QWidget *CNameDlg)
    {
    if (CNameDlg->objectName().isEmpty())
       CNameDlg->setObjectName(QString::fromUtf8("CNameDlg"));
    CNameDlg->resize(410, 111);
    CNameDlg->setFocusPolicy(Qt::StrongFocus);
    label = new QLabel(CNameDlg);
    label->setObjectName(QString::fromUtf8("label"));
    label->setGeometry(QRect(10, 10, 250, 18));
    m_name = new QLineEdit(CNameDlg);
    m_name->setObjectName(QString::fromUtf8("m_name"));
    m_name->setGeometry(QRect(10, 60, 240, 27));
    } // setupUi
};
 
#endif

#ifndef DIALOG_H
#define DIALOG_H

#include <QtGui/QDialog>
#include <QtGui/QLabel>
#include <QtGui/QLineEdit>
#include <QtGui/QVBoxLayout>
#include <QtGui/QWidget>

#include <QtGui/QApplication>

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog();
    void addPage(QWidget* page);

private:
   QWidget *verticalLayout;
   QVBoxLayout *vboxLayout;
   QLabel *label;

   void setupUi(QDialog *Dialog)
   {
   if (Dialog->objectName().isEmpty())
      Dialog->setObjectName(QString::fromUtf8("Dialog"));
   Dialog->resize(535, 302);
   Dialog->setFocusPolicy(Qt::StrongFocus);
   verticalLayout = new QWidget(Dialog);
   verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
   verticalLayout->setGeometry(QRect(10, 30, 511, 221));
   vboxLayout = new QVBoxLayout(verticalLayout);
   vboxLayout->setObjectName(QString::fromUtf8("vboxLayout"));
   vboxLayout->setContentsMargins(0, 0, 0, 0);
   label = new QLabel(Dialog);
   label->setObjectName(QString::fromUtf8("label"));
   label->setGeometry(QRect(10, 10, 54, 18));

   Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", 0, QApplication::UnicodeUTF8));
   label->setText(QApplication::translate("Dialog", "Test", 0, QApplication::UnicodeUTF8));
   } // setupUi
};


class CNameDlg : public QWidget
{
   Q_OBJECT

public:
   CNameDlg(QWidget *parent = 0);
   QLabel *label;
   QLineEdit *m_name;

   void setupUi(QWidget *CNameDlg)
    {
    if (CNameDlg->objectName().isEmpty())
       CNameDlg->setObjectName(QString::fromUtf8("CNameDlg"));
    CNameDlg->resize(410, 111);
    CNameDlg->setFocusPolicy(Qt::StrongFocus);
    label = new QLabel(CNameDlg);
    label->setObjectName(QString::fromUtf8("label"));
    label->setGeometry(QRect(10, 10, 250, 18));
    m_name = new QLineEdit(CNameDlg);
    m_name->setObjectName(QString::fromUtf8("m_name"));
    m_name->setGeometry(QRect(10, 60, 240, 27));
    } // setupUi
};

#endif

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and finally focus.pro

HEADERS     = dialog.h
SOURCES     = dialog.cpp \
              main.cpp
 
# install
target.path = .
sources.files = $$SOURCES $$HEADERS *.pro
sources.path = .
INSTALLS += target sources

HEADERS     = dialog.h
SOURCES     = dialog.cpp \
              main.cpp

# install
target.path = .
sources.files = $$SOURCES $$HEADERS *.pro
sources.path = .
INSTALLS += target sources

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Note that some of the code was copied from the compile of the .ui files I have.

If you compile & run this, you'll have a dialog, with a label ("test") and an QLineEdit. The QLineEdit is +not+ the focus.

Vycke

[jacek]

It seems that the problem is caused by "page->setFocus(Qt::OtherFocusReason);" line --- comment it out and it should work. Other solution is make invoke setFocusProxy( m_name ) in CNameDlg.

[vycke]

It seems that the problem is caused by "page->setFocus(Qt::OtherFocusReason);" line --- comment it out and it should work. Other solution is make invoke setFocusProxy( m_name ) in CNameDlg.

Removing the setFocus() call didn't work (4.3.2... might be a bug there). But adding the setFocusProxy() in the contructor of CNameDlg did.

Thanks so much.

Vycke