A simple virtual keyboard in Unity (2020_3_21f).

The challenge was:

• Focus should remain on the input field when the user interface buttons are pressed.
• Caret must remain in last position.
• Pressing UI button when the text is selected should replace it with corresponding character. Selection should dissapear, the caret should move to the position after this symbol.
• Backspace, Left and Right buttons should be implemented. Left and Right buttons should move the cursor over the input field.
• Virtual keyboard must be consistent and should not interfere with manual input from a real keyboard,
• The bonus is to implement multiple keystrokes on the button hold, as on a real keyboard.