Virtual Keyboard logic?

[lolcocks]

Hello,

I am new to Qt and making a personal application using PySide2.

I want a virtual keyboard on my application as I am putting it on the Raspberry Pi.

I have designed a simple numpad as I only need numbers.

Problem is that I have never done this before and don't know the logic to use for it.

Like there are 5 single line entry input boxes. I will tap on first one, then press a number on the virtual numpad. But what is the logic that I should implement on the button?

My current thinking is that I will get the current cursor position and insert a number there but won't tapping a button change the current cursor location?

[SGaist]

Hi and welcome to devnet,

You should read about the Qt input method:

• https://www.kdab.com/qt-input-method-depth/
• https://www.kdab.com/qt-input-method-virtual-keyboard/

They give a pretty good overview on how to implement a virtual keyboard for Qt.

[lolcocks]

@SGaist

@SGaist said in Virtual Keyboard logic?:

Hi and welcome to devnet,

You should read about the Qt input method:

• https://www.kdab.com/qt-input-method-depth/
• https://www.kdab.com/qt-input-method-virtual-keyboard/

They give a pretty good overview on how to implement a virtual keyboard for Qt.

Ummmm, quick question, does PySide2 have a implementation of these virtual keyboards?

[SGaist]

Do you mean a version of the example from KDAB translated to python ?

[mrjj]

Hi
Im not sure if you ask about the Qt virtual keyboard or just a homemade mini version.

But what is the logic that I should implement on the button?

For a homemade very simple keyboard, you should
Flag all buttons with NoFocus ( setFocusPolicy )
So they don't steal the keyboard focus from the current selected Widget
when you click a keyboard button.

Then you can use
QWidget * widgetName = qApp->focusWidget();

To find out which another widget the keyboard should type into.

Then use sendEvent to send key presses to the selected widget

QKeyEvent event1(QEvent::KeyPress, Qt::Key_A, Qt::NoModifier, "a");
QKeyEvent event2(QEvent::KeyRelease, Qt::Key_A, Qt::NoModifier);
QApplication::sendEvent(widgetName , &event1);
QApplication::sendEvent(widgetName , &event2);

make sure to send both key up/down as a normal key would.