QLabel::clicked()

[dogbear]

I agree with Lotek.
A mouse "click" is traditionally a full press-then-release event series.
Interpreting a click on a mouse press disallows the user from canceling the click when they drag the mouse away from the item, amongst other things.
Just my two-cents.
doggy

[gadlol]

And how to check which label has been clicked if have many????

[Talei]

Using above example if You connect multiple instances of myLabel object into one slot then within that slot You can use sender() to determine what myLabel object send the signal. To have full access You can cast it lik:

myLabel *Label = qobject_cast<myLabel *>( this->sender() );
Label->setText( QString( "This sender is: %1" ).arg( this->sender()->objectName() ) );

myLabel *Label = qobject_cast<myLabel *>( this->sender() );
Label->setText( QString( "This sender is: %1" ).arg( this->sender()->objectName() ) );

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Label is pointer to the object that send signal.

[study24816]

thanks to this thread! I'm having the same problem with my project and this works just fine for me. But, in my application, besides emitting the signal after the mouse is clicked/released, I also need to know the coordinates of the clicked point. Is there any way to program this??
I'm new to Qt and is learning .

[d_stranz]

Did you read the docs on QMouseEvent? There are 7 different methods to give you information about the position of the mouse.

If the slot listening for the clicked() signal needs to know the mouse position, then change the clicked signal to send the position as an argument:

// myLabel.h
signals:
  void clicked( const QPos & );
 
// myLabel.cpp:
 
void myLabel::mouseReleaseEvent( QMouseEvent * event )
{
  emit clicked( event->pos() );
}

// myLabel.h
signals:
  void clicked( const QPos & );

// myLabel.cpp:

void myLabel::mouseReleaseEvent( QMouseEvent * event )
{
  emit clicked( event->pos() );
}

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[study24816]

I think I've foudn the answer. the pointer *event to QMouseEvent stores the relevant information about the event mousepress/release. I gotta read more about QMouseEvent.

Thanks