How assign the enter key to a button

fs_tigre

Hi,

How can I assign the enter key to a button? In other words how can I assign the enter key to a button so that when the enter key is pressed it basically trigers the button.

Thanks

adnan

There is an option for setDefault(bool) . If you are using Qt creater, just select the form( your_app.ui). When the form appears select the button and enable setDefault. Alternately,
@your_push_button->setDefault(true)@

This will work if your dialog or window has focus at the time of pressing enter.

dbzhang800

[quote author="fs_tigre" date="1333999164"]Hi,

How can I assign the enter key to a button? In other words how can I assign the enter key to a button so that when the enter key is pressed it basically trigers the button.

Thanks[/quote]

If your Button is on QDialog or its subClass, you can using setDefault(), otherwise, maybe you can use eventfilter.

fs_tigre

Hmm, setting the button to default didn't work.

This is what I tried...
@ui->pushButton_Calculate->setDefault(true);@

Any other suggestion?

Thank you all for your help

dbzhang800

[quote author="fs_tigre" date="1334010901"]Hmm, setting the button to default didn't work.

This is what I tried...
@ui->pushButton_Calculate->setDefault(true);@

Any other suggestion?

Thank you all for your help

[/quote]

Are you sure your button is on a QDialog?

fs_tigre

No, this is in a window, should it be different?

Thanks

dbzhang800

Yes, indeed, it's QDialog's feature.

[quote author="fs_tigre" date="1334012435"]No, this is in a window, should it be different?

Thanks[/quote]

fs_tigre

So, what should I be using?

Thanks

andre

An event filter on the window would do the trick.

fs_tigre

Thank you all.

How do you apply the event filter to a button?

I tried this but it dint work.
@ui->pushButton_Calculate->eventFilter(pushButton,true);@

Thanks

andre

No, that does not work. Did you read the documenation on event filters? You need to install it on the top-level widget, subclass your Button, and reimplement the eventFilter method.

Alternatively, and easier: you can use a [[doc:QShortCut]]. Just create a shortcut for the Enter key, and connect it's activated() signal to the click() slot of the button.

fs_tigre

bq. No, that does not work. Did you read the documenation on event filters? You need to install it on the top-level widget, subclass your Button, and reimplement the eventFilter method.

I actually did, the problem is that I'm a beginner on Qt as well as on C++, so I don't completely understand the documentation. In fact I'm having a hard time following your instructions... Sorry!!!
bq. You need to install it on the top-level widget, subclass your Button, and reimplement the eventFilter method.

Too advanced. I know I know, its probably a pain to teach a beginner. I will reread and try again.

Thanks a lot for your help

andre

Why don't you try try the QShortCut method then? That should be easier...

Having a basic understanding of C++, including classes & objects, inheritance and polymorphism is really needed to work with Qt. If you don't understand those, then please get a C++ book and learn about them. It will make it much easier for you to understand Qt.

fs_tigre

bq. Why don’t you try try the QShortCut method then? That should be easier…
Having a basic understanding of C++, including classes & objects, inheritance and polymorphism is really needed to work with Qt. If you don’t understand those, then please get a C++ book and learn about them. It will make it much easier for you to understand Qt.

I will try the short cut. As far as learning C++, I'm currently taking a class and reading as much as I can.

Thanks a lot for your help!

fs_tigre

I tried the QShortcut but I cannot make it work.

Here is my code, I dont get any errors but it doen't assign the enter key to my button
@ QShortcut *shortcut = new QShortcut(QKeySequence("Enter"), ui->groupBox);
QObject::connect(shortcut, SIGNAL(activated()), ui->pushButton_Calculate, SLOT(click()));@
I also tried...
@QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_Enter), ui->groupBox);
QObject::connect(shortcut, SIGNAL(activated()), ui->pushButton_Calculate, SLOT(click()));@
But it didn't work.

Any idea why this is not working?

thanks

RaubTieR

Also you can reimplement this for your window
@void MainWindow::keyPressEvent(QKeyEvent* pe)
{
if(pe->key() == Qt::Key_Return) yout_button_slot();
}@

this function is virtual and present in QMainWindow's base class, though may be you will need
@#include <QKeyEvent>@

you may also check for Key_Enter which is actually numpad one

fs_tigre

@void MainWindow::keyPressEvent(QKeyEvent* pe)
{
if(pe->key() == Qt::Key_Return) yout_button_slot();
}@

Sorry but I'm lost now. Where do I place this function?

RaubTieR

well you've told you have a window with buttons, this window has a specific class, which might be declared like that for instance (by default for single window gui app) :

@class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private:
Ui::MainWindow *ui;

// here i add this function
protected:
void keyPressEvent(QKeyEvent* pe);
};@

in protected section you declare the function, you may define it here or in the corresponding .cpp file - as usual method

fs_tigre

I found my problem, I had my code in the wrong place.

This is the code that worked.
@QShortcut *returnShortcut = new QShortcut(QKeySequence("Return"), ui->groupBox);
QObject::connect(returnShortcut, SIGNAL(activated()), ui->pushButton_Calculate, SLOT(click()));@

Thank you all very much for your help!

crates

@fs_tigre great!!