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Monday, June 3rd 2013, 7:34am


Hello All, I am new to Qt and I am trying to make a program where when i click the lineedit , a pop up box would show up below . I am able to do that by using

Source code

void MainWindow::on_NRIC_cursorPositionChanged(int arg1, int arg2){popupKeyboard();//Showing the popup keyboard

But after i close the popup and click on the QLineEdit , The popup does not show at all .

There is another problem , When the text fill is filled with letters,Whenever I press Enter on the popup menu, it would take many clicks to close

Source code

 QFrame* popupNumpadBed = new QFrame(this, Qt::Tools| Qt::FramelessWindowHint);
     popupNumpadBed->setAttribute( Qt::WA_TranslucentBackground ); 
 QPushButton *BedEnter= new QPushButton(  popupNumpadBed );
    BedEnter->setGeometry(450,256.66666, 150, 53.33333);
  connect(BedEnter, SIGNAL(clicked()), popupNumpadBed, SLOT(hide()));

Please Help thank you



  • "pele1410" is male

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Friday, June 14th 2013, 3:07pm

If I had to guess, the reason it will not show up twice initially is that the first time you click in it, the cursor is set to position 0. When you close the popup and press it again, the cursor position is still at 0, so the position did not change (hence the slot not being called).

For your second issue, every time a letter is entered, the cursor position is changed so your slot is called. Without seeing your popupKeyboard () function, I'd guess you're creating a new popup everytime? So you're not closing the same popup multiple times, but closing multiple popups.

You can solve the second problem by checking inside of popupKeyboard to see if a popup is already open.

But as a much broader solution, I would subclass QLineEdit, and implement the mousePressEvent. In that function you could emit a signal that triggers a slot in whatever class this code is from.
"Without imperfection, you or I would not exist." ~Stephen Hawking

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