shift + key

[jajdoo]

for some reason i cant make this work.

i tried to detect shift + tab:

switch(e->key())
    {
 
    case Qt::Key_Tab:
        if(textCursor().selectionEnd() - textCursor().selectionStart() > 0)
        {
            bool shiftHeld = (e->modifiers() & Qt::ShiftModifier);
            tabPressedEvent( shiftHeld );
            return;
        }
    }

switch(e->key())
    {

    case Qt::Key_Tab:
        if(textCursor().selectionEnd() - textCursor().selectionStart() > 0)
        {
            bool shiftHeld = (e->modifiers() & Qt::ShiftModifier);
            tabPressedEvent( shiftHeld );
            return;
        }
    }

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didn't work. idea?

[saa7_go]

Maybe you need to add

e->accept();

e->accept();

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before return statement.

[snah]

QWidget detects shift-tab in the event() method (together with some other key combinations, see the source if you're curious) and prevents keypressEvent from being called.
You can re-implement QWidget::event() and handle it there or forward it to keypressEvent manually.

Be aware that this may have side effects for navigating widgets using tab/shift-tab, but I'm not sure about that.

[jajdoo]

in an example i found they did it in the KeyPressedEvent - is that outdated?
http://doc.trolltech.com/4.4/tools-customcompleter.html

the accept didn't work.

debugged it a little, seems it detects shift as the input key.
can you post (or point me to) an example of how to do so with the QWidget::event()?

[snah]

Ok, just had another look at this and it turns out that QWidget::event() doesn't actually block shift-tab. sorry for misinforming you, looked over the source a bit to hastily.

I've done some testing and found out that shift-tab is not reported as Qt::Key_Tab, but as Qt::Key_Backtab (at least on my system, debian linux with kde). So all you have to do is check for Qt::Key_Backtab:

switch(e->key())
    {
    case Qt::Key_Tab:
        if(textCursor().selectionEnd() - textCursor().selectionStart() > 0)
        {
            bool shiftHeld = e->modifiers() & Qt::ShiftModifier;
            tabPressedEvent( shiftHeld );
        }
        break;
 
    case Qt::Key_Backtab:
        tabPressedEvent( true );
        break;
    }

switch(e->key())
    {
    case Qt::Key_Tab:
        if(textCursor().selectionEnd() - textCursor().selectionStart() > 0)
        {
            bool shiftHeld = e->modifiers() & Qt::ShiftModifier;
            tabPressedEvent( shiftHeld );
        }
        break;

    case Qt::Key_Backtab:
        tabPressedEvent( true );
        break;
    }

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Where I kept the shift modifier check, just in case there is a system which does not use backtab to identify shift+tab.

If you need to dissable the behavour that tab/shift+tab changes focus to the next widget you will still need to re-implement event() however. The article Events and Event Filters has an example on this (which is perfect for you).

hope this helps and happy coding.

[jajdoo]

wow.. this is almost embarrassingly simple.

this is also true for brackets and braces it seems