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Thread: On Screen Keyboard Problem

  1. #1
    Join Date
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    Qt products
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    Platforms
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    Default On Screen Keyboard Problem

    hi all!

    i'm currently developing an on screen keyboard to be use for my touch screen application. i'm using qt 3.3 in unix/x11.

    i have already a keyboard layout, and codes with in the keyboard keys. i used XSendEvent() function to send an event.

    all the letters from a-z and special characters works fine, except for the function keys f1-f12, tab, enter and arrow keys.

    heres my code in creating event:
    Qt Code:
    1. XKeyEvent createKeyEvent(Display *display, Window &win,
    2. Window &winRoot, bool press,
    3. int keycode, int modifiers)
    4. {
    5. XKeyEvent event;
    6.  
    7. event.display = display;
    8. event.window = win;
    9. event.root = winRoot;
    10. event.subwindow = None;
    11. event.time = CurrentTime;
    12. event.x = 1;
    13. event.y = 1;
    14. event.x_root = 1;
    15. event.y_root = 1;
    16. event.same_screen = TRUE;
    17. event.state = modifiers;
    18. event.keycode = XKeysymToKeycode(display,keycode);
    19. if(press)
    20. event.type = KeyPress;
    21. else
    22. event.type = KeyRelease;
    23.  
    24. return event;
    25. }
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    for the sendkey event:

    Qt Code:
    1. int tsKeyboardWidget::SendKeys(int keycode)
    2. {
    3. //modifier=pubModifier->text().toInt();
    4. // Obtain the X11 display.
    5. Display *display = XOpenDisplay(NULL);
    6. if(display == NULL)
    7. return -1;
    8.  
    9. // Get the root window for the current display.
    10. Window winRoot;// = XRootWindow(display,1);
    11.  
    12. // Find the window which has the current keyboard focus.
    13. Window winFocus;
    14. int revert=RevertToParent;
    15. //int RevertToParent=0;
    16. XGetInputFocus(display, &winFocus,&revert);
    17. winFocus=winFocus+1;
    18.  
    19.  
    20. // Send a fake key press event to the window.
    21. XSelectInput(display, winFocus,FocusChangeMask|KeyPressMask|KeyReleaseMask);
    22. XMapWindow(display, winFocus);
    23.  
    24. XKeyEvent event = createKeyEvent(display, winFocus, winRoot, true, keycode, modifier);
    25.  
    26. XSendEvent(event.display, event.window, True, KeyPressMask, (XEvent *)&event);
    27.  
    28. event = createKeyEvent(display, winFocus, winRoot, false, keycode, modifier);
    29. XSendEvent(event.display, event.window, True, KeyPressMask, (XEvent *)&event);
    30. XCloseDisplay(display);
    31. return 0;
    32. }
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    for button press, for example when i press the button A.

    Qt Code:
    1. void tsKeyboardWidget::btnA_clicked()
    2. {
    3. SendKeys(Qt::Key_A);
    4.  
    5. }
    To copy to clipboard, switch view to plain text mode 

    when i send Qt::Key_A it works.

    my problem is, when i send the Qt::Key_Tab or Qt::Key_Enter, nothing happens.

    is there something wrong with code? or is there another way to send the TAB or ENTER key as what the real keyboard does?

    thnks...
    Last edited by cutie.monkey; 16th July 2008 at 07:28. Reason: updated contents

  2. #2
    Join Date
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    Location
    Denmark / Norway
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    Qt products
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    Default Re: On Screen Keyboard Problem

    Hi

    Qt::Key_Tab isn't the same as keycode required in createKeyEvent.

    The keycodes on X11 can be found here:
    http://cvsweb.xfree86.org/cvsweb/xc/....h?rev=1.1.1.4

    You need to either make a mapping between QT::Key_XX and XK_XX, or use XK_XX directly.

    cheers,
    leif

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