Catch a Key, like designer

[aekilic]

Dear All

I started a thread yesterday, but I dont know why and how, it has been moved to newbei

What I would like to do is, like in designer, I would like to create a line, and when a press a line it should write on the line what I have pressed.

Is the a example code for this, or where could I find the codes for the designer.

[spirit]

I started a thread yesterday, but I dont know why and how, it has been moved to newbei

because it's newbie question, just install event filter to your line edit and process QKeyEvent.

[wagmare]

can u give more information about ur need ..

[aekilic]

What I need is

I would like to know which key has been pressed for a qline

[spirit]

here is an example, is it hard to write it by youself?

...
lineEdit = new QLineEdit();
lineEdit->installEventFilter(this);
...
bool MyWidget::eventFilter(QObject *o, QEvent *e)
{
	if (o == lineEdit && e->type() == QEvent::KeyPress) {
		const QKeyEvent *ke = static_cast<QKeyEvent *>(e);
		const QKeySequence ks(ke->modifiers() + ke->key());
		lineEdit->setText(ks.toString());
	}
	return QWidget::eventFilter(o, e);
}

...
lineEdit = new QLineEdit();
lineEdit->installEventFilter(this);
...
bool MyWidget::eventFilter(QObject *o, QEvent *e)
{
	if (o == lineEdit && e->type() == QEvent::KeyPress) {
		const QKeyEvent *ke = static_cast<QKeyEvent *>(e);
		const QKeySequence ks(ke->modifiers() + ke->key());
		lineEdit->setText(ks.toString());
	}
	return QWidget::eventFilter(o, e);
}

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nothing special, right?
that's why you question is newbie.

[wagmare]

use keypressEvent and check with the respected key ... QKeyEvent has a function
bool operator== ( QKeyEvent * e, QKeySequence::StandardKey key ) where standard keys will help u ..

[aekilic]

Dear spirit

Thank you very much for your reply yes you right it was easy but the problem is, we wrote a program which is open source there is a company who is selling a similar program whoes owner is treatening us everyday that we made a program like this. So I am not really thinking 100% sorry

[aekilic]

I got another problem for this, the code you have sent is working fine spirit for CTRL

When I press shift + r , it writes to the line SHIFT+RR or for ALT it writes ALT+Rr

Can any ona tell me the reason?

[spirit]

try this

lineEdit->setText(ks.toString(QKeySequence::NativeText));

lineEdit->setText(ks.toString(QKeySequence::NativeText));

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[aekilic]

no I still get

Shift+HH when I press shift+h

[spirit]

what system do you use?
under Windows this code works fine.

[wagmare]

in linus also the same problem arise .. if i press key "a" it shows "Aa" ...

[spirit]

from Qt Assistant

QKeySequence::NativeText 0 The key sequence as a platform specific string. This means that it will be shown translated and on the Mac it will resemble a key sequence from the menu bar. This enum is best used when you want to display the string to the user.
QKeySequence::PortableText 1 The key sequence is given in a "portable" format, suitable for reading and writing to a file. In many cases, it will look similar to the native text on Windows and X11.

[aekilic]

I use vista Qt4.5.0

[spirit]

take a look implementation of QtKeySequenceEdit in QTDIR\tools\shared\qtpropertybrowser\qttreepropert ybrowser.cpp.

[aekilic]

I accidentaly use this code

if (o == lineDeNo && e->type() == QEvent::KeyPress) {
	        const QKeyEvent *ke = static_cast<QKeyEvent *>(e);
	        const QKeySequence ks(ke->modifiers() + ke->key());
	        lineDeNo->setText(ks.toString(QKeySequence::NativeText));
	    }
	    if (o == lineMa && e->type() == QEvent::KeyPress) {
	        const QKeyEvent *ke = static_cast<QKeyEvent *>(e);
	        const QKeySequence ks(ke->modifiers() + ke->key());
	        lineMa->setText(ks.toString());
	        lineDeNo->setText(ks.toString(QKeySequence::PortableText));
	    }

if (o == lineDeNo && e->type() == QEvent::KeyPress) {
	        const QKeyEvent *ke = static_cast<QKeyEvent *>(e);
	        const QKeySequence ks(ke->modifiers() + ke->key());
	        lineDeNo->setText(ks.toString(QKeySequence::NativeText));
	    }
	    if (o == lineMa && e->type() == QEvent::KeyPress) {
	        const QKeyEvent *ke = static_cast<QKeyEvent *>(e);
	        const QKeySequence ks(ke->modifiers() + ke->key());
	        lineMa->setText(ks.toString());
	        lineDeNo->setText(ks.toString(QKeySequence::PortableText));
	    }

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When editting lineDoNo it doesnt work but When I edit lineMa, lineDeNo works fine,

I try

if (o == lineDeNo && e->type() == QEvent::KeyPress) {
	        const QKeyEvent *ke = static_cast<QKeyEvent *>(e);
	        const QKeySequence ks(ke->modifiers() + ke->key());
	        lineDeNo->setText(ks.toString(QKeySequence::PortableText));
	    }

if (o == lineDeNo && e->type() == QEvent::KeyPress) {
	        const QKeyEvent *ke = static_cast<QKeyEvent *>(e);
	        const QKeySequence ks(ke->modifiers() + ke->key());
	        lineDeNo->setText(ks.toString(QKeySequence::PortableText));
	    }

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but it doesnt work...

[spirit]

do you install event filters for both lineedits?

[aekilic]

yes, I do install for both lines

[spirit]

ok, can you attach compilable example which contains this bug?

[aekilic]

do you mean the code for this area?