need to filter Esc key for a dialog in a class

[Askar]

Dear friends,

i need to filter Esc key for a particular dialog in my project not for all dialogs, i tried with overriding

QDialog::KeyPressEvent(QKeyEvent *)

QDialog::KeyPressEvent(QKeyEvent *)

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but it applies for all dialogs in my project. i need help...

Thanks,

regards,
Askar

[wagmare]

install eventFilter for the QDialog and catch the key Qt::key
or use QAction for key and triggered to an empty slot()

Dialog:: eventFilter(QObject *ob, QEvent *e)
{
        if(e->type() == Qt::Key_Escape){
                printf("is it coming inside event..\n")
        }
         return QWidget::eventFilter(ob, e);
}

Dialog:: eventFilter(QObject *ob, QEvent *e)
{
        if(e->type() == Qt::Key_Escape){
                printf("is it coming inside event..\n")
        }
         return QWidget::eventFilter(ob, e);
}

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[Askar]

I cont understand how can i use ur code

[wagmare]

see eventFilter is a virtually protected property of QObject

see this link http://doc.trolltech.com/4.2/eventsandfilters.html

this protected function is used to filter the particular event on the widget ex: mouse press, keypress, mouse hover

using the event filter u can catch the key press of escape ..

this code

bool FilterObject::eventFilter(QObject *object, QEvent *event)
 {
     if (object == target && event->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
         if (keyEvent->key() == Qt::Key_escape) {
             // Special tab handling
             return true;
         } else
             return false;
     }
     return fals

bool FilterObject::eventFilter(QObject *object, QEvent *event)
 {
     if (object == target && event->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
         if (keyEvent->key() == Qt::Key_escape) {
             // Special tab handling
             return true;
         } else
             return false;
     }
     return fals

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will filter the escape key input of the QDialog

[Askar]

I TRIED WITH THIS CODE

bool QDialog::eventFilter(QObject *object, QEvent *event)
 {
     if (event->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
         if (keyEvent->key() == Qt::Key_Escape) {
             keyEvent->ignore();
             // Special tab handling
             return true;
         } else
             return false;
     }
     return false;
 }

bool QDialog::eventFilter(QObject *object, QEvent *event)
 {
     if (event->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
         if (keyEvent->key() == Qt::Key_Escape) {
             keyEvent->ignore();
             // Special tab handling
             return true;
         } else
             return false;
     }
     return false;
 }

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BUT , THE CONDITION

if (event->type() == QEvent::KeyPress)

if (event->type() == QEvent::KeyPress)

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FAILS FOR Esc KEYY PRESS\

[wagmare]

did u give installEventFilter(this) to the QDialog ... can u show us the code u written

[Askar]

sure here is my code

void CommonFunctions::progressbar(QString Dialogtext)
{
    layout = new QVBoxLayout;
    l = new QLabel( Dialogtext);
    l->setWordWrap(true);
    progress = new QProgressBar();
    progress->setWindowModality(Qt::WindowModal);
    progress->setRange(0,10);
    layout->addWidget(l);
    layout->addWidget(progress,Qt::AlignCenter);
    win->setMaximumWidth(320);
    win->setModal(true);
    win->setLayout(layout);
    win->setWindowTitle("title");
    installEventFilter(win);
    win->setWindowFlags(Qt::Dialog|Qt::WindowMaximizeButtonHint);
    win->show();
}
 
bool QDialog::eventFilter(QObject *object, QEvent *event)
 {
     if (event->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
         if (keyEvent->key() == Qt::Key_Escape) {
             keyEvent->ignore();
             return true;
         } else
             return false;
     }
     return false;
 }

void CommonFunctions::progressbar(QString Dialogtext)
{
    layout = new QVBoxLayout;
    l = new QLabel( Dialogtext);
    l->setWordWrap(true);
    progress = new QProgressBar();
    progress->setWindowModality(Qt::WindowModal);
    progress->setRange(0,10);
    layout->addWidget(l);
    layout->addWidget(progress,Qt::AlignCenter);
    win->setMaximumWidth(320);
    win->setModal(true);
    win->setLayout(layout);
    win->setWindowTitle("title");
    installEventFilter(win);
    win->setWindowFlags(Qt::Dialog|Qt::WindowMaximizeButtonHint);
    win->show();
}

bool QDialog::eventFilter(QObject *object, QEvent *event)
 {
     if (event->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
         if (keyEvent->key() == Qt::Key_Escape) {
             keyEvent->ignore();
             return true;
         } else
             return false;
     }
     return false;
 }

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i had checked this code by setting a breakpoint in eventFilter(), while pressing Esc key debugger stops at break point and checks the condition in 22 line of the above code , but it fails & returns false

where im getting wrong can u help me....