Ignore standard input

gabello306

I am new to Qt and am trying to replace a character in an input into a QLineEdit field. I have created a QKeyPressed method to get each character.

//-----------------------------------------------------------------------------
// eventFilter
// Evaluate each character input
//-----------------------------------------------------------------------------
bool NotebookView::eventFilter(QObject* watched, QEvent* event)
{
    if(watched->inherits("QLineEdit"))
    {
        if(event->type() == QEvent::KeyPress)
        {
            QKeyEvent* keyCode = static_cast<QKeyEvent*>(event);
            if((watched == ui->aoEnterVal) || (watched == ui->aoRangeVal))
            {
                m_pCommon->AO_Char(watched, keyCode);
            }
        }
    }
    return QObject::eventFilter(watched, event);
}

I am trying to replace the space with an actual value.

case Qt::Key_Space:

    str = control->objectName().toStdString();

    // Don't display Preferences character in Remarks
    if( ( str.substr ( 2, 6 ) != "Remark" ) ||
        ( str == "mmEnterVal" ) )
    {
        // Fill character from defined character in Preferences
        editField->insert(Preferences.currChar);
    }
    else
    {
        editField->insert(" ");
    }
    break;

The case works but I am still getting the space in the QLineEdit field. If I replace a character, I need to ignore the actual input character. Any ideas?

hskoglund

Hi, instead of passing the torch, i.e. doing
return QObject::eventFilter(watched, event);
try
return true;
to toss the key.

gabello306

I tried that and it doesn't even show the QlineEdit entry fields. They are are just gone.

JonB

@gabello306
Could you show the code as you have it now? You haven't literally replaced the only return QObject::eventFilter(watched, event); occurrence in your code above with an unconditional return true;, have you?

gabello306

I figured out the problem. Instead of putting the return true at the end, I added it under the AO_Char call. Doing this gets rid of the extra character. See the code below for the change.

//-----------------------------------------------------------------------------
// eventFilter
// Evaluate each character input
//-----------------------------------------------------------------------------
bool NotebookView::eventFilter(QObject* watched, QEvent* event)
{
    if(watched->inherits("QLineEdit"))
    {
        if(event->type() == QEvent::KeyPress)
        {
            QKeyEvent* keyCode = static_cast<QKeyEvent*>(event);
            if((watched == ui->aoEnterVal) || (watched == ui->aoRangeVal))
            {
                m_pCommon->AO_Char(watched, keyCode);
                return true;
            }
        }
    }
    return QObject::eventFilter(watched, event);
}

JonB

@gabello306 Yes, well done, that is what @hskoglund meant :) You only return true for those events you have handled/want ignored.