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Thread: Virtual Keyboard to website

  1. 19th December 2012, 05:21 #1
    Afandi
    Afandi is offline Beginner
    Join Date
    Dec 2012
    Posts
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Virtual Keyboard to website

    How can I program virtual keyboard so that when we type lower case letter 'a', it will display lower case 'a' on the textbox of the website?

    But the problem with the keyboard that I'm handling now, when I type lower case 'a',it will display upper case 'A' on the textbox of the website.

    This is the image of the keyboard and also the example website
    Keyboard Error.jpg

    There is also another problems which led to functionality of the keyboard.
    The symbol and number is not working.
    When I click number it does not, show any number but when I clicked symbol, some different things came out.
    SYmbol error.jpg

    Here is keyboard.cpp file

    Qt Code: 
    1. #include "keyboard.h"
    2. #include <QEvent>
    3. #include <QKeyEvent>
    4. #include <QApplication>
    5.  
    6. Keyboard::Keyboard(QObject *parent) : QObject(parent)
    7. {
    8.     theWidget = NULL;
    9. }
    10.  
    11. void Keyboard::setWidget(QWidget* theWidget)
    12. {
    13.     this->theWidget = theWidget;
    14. }
    15.  
    16. void Keyboard::simulateKey(QString keyName)
    17. {
    18.     Qt::Key keycode = getKeyCodeFromName(keyName);
    19.     if (keycode == Qt::Key_unknown || this->theWidget == NULL)
    20.         return;
    21.  
    22.     //A-Z
    23.     if (keyName.length() == 1 && keyName[0].unicode() >= 'A' && keyName[0].unicode() <= 'Z')
    24.     {
    25.         QKeyEvent keyPressEvent(QEvent::KeyPress, keycode, Qt::ShiftModifier);
    26.         QApplication::sendEvent(this->theWidget, &keyPressEvent);
    27.  
    28.         QKeyEvent keyReleaseEvent(QEvent::KeyRelease, keycode, Qt::ShiftModifier);
    29.         QApplication::sendEvent(this->theWidget, &keyReleaseEvent);
    30.     }
    31.     else
    32.     {
    33.         QKeyEvent keyPressEvent(QEvent::KeyPress, keycode, Qt::NoModifier);
    34.         QApplication::sendEvent(this->theWidget, &keyPressEvent);
    35.  
    36.         QKeyEvent keyReleaseEvent(QEvent::KeyRelease, keycode, Qt::NoModifier);
    37.         QApplication::sendEvent(this->theWidget, &keyReleaseEvent);
    38.     }
    39.  
    40.     qDebug("Simulating key: %s", qPrintable(keyName));
    41. }
    42.  
    43. Qt::Key Keyboard::getKeyCodeFromName(QString keyname)
    44. {
    45.     keyname = keyname.toLower();
    46.     if (keyname.length() < 1)
    47.         return Qt::Key_unknown;
    48.  
    49.     if (keyname == "left")              return Qt::Key_Left;
    50.     else if (keyname == "right")        return Qt::Key_Right;
    51.     else if (keyname == "up")           return Qt::Key_Up;
    52.     else if (keyname == "down")         return Qt::Key_Down;
    53.     else if (keyname == "center")       return Qt::Key_Enter;
    54.     else if (keyname == "enter")        return Qt::Key_Enter;
    55.     else if (keyname == "tab")          return Qt::Key_Tab;
    56.     else if (keyname == "\n")           return Qt::Key_Enter;
    57.     else if (keyname == "cpanel")       return Qt::Key_PageUp;
    58.     else if (keyname == "widget")       return Qt::Key_PageDown;
    59.     else if (keyname == "pgup")         return Qt::Key_PageUp;
    60.     else if (keyname == "pgdown")       return Qt::Key_PageDown;
    61.     else if (keyname == "pageup")       return Qt::Key_PageUp;
    62.     else if (keyname == "pagedown")     return Qt::Key_PageDown;
    63.  
    64.     else if (keyname == "esc")          return Qt::Key_Escape;
    65.     else if (keyname == "del")          return Qt::Key_Delete;
    66.     else if (keyname == "delete")       return Qt::Key_Delete;
    67.     else if (keyname == "backspace")    return Qt::Key_Backspace;
    68.     else if (keyname == "space")        return Qt::Key_Space;
    69.     else if (keyname == " ")            return Qt::Key_Space;
    70.     else if (keyname == "+")            return Qt::Key_Plus;
    71.     else if (keyname == "-")            return Qt::Key_Minus;
    72.     else if (keyname == "*")            return Qt::Key_Asterisk;
    73.     else if (keyname == "/")            return Qt::Key_Slash;
    74.     else if (keyname == "\\")           return Qt::Key_Backslash;
    75.     else if (keyname == ".")            return Qt::Key_Period;
    76.     else if (keyname == ",")            return Qt::Key_Comma;
    77.     else if (keyname == "?")            return Qt::Key_Question;
    78.     else if (keyname == "<")            return Qt::Key_Less;
    79.     else if (keyname == ">")            return Qt::Key_Greater;
    80.     else if (keyname == "=")            return Qt::Key_Equal;
    81.     else if (keyname == "@")            return Qt::Key_At;
    82.     else if (keyname == "!")            return Qt::Key_Exclam;
    83.     else if (keyname == "%")            return Qt::Key_Percent;
    84.     else if (keyname == "$")            return Qt::Key_Dollar;
    85.     else if (keyname == ":")            return Qt::Key_Colon;
    86.     else if (keyname == ";")            return Qt::Key_Semicolon;
    87.     else if (keyname == "(")            return Qt::Key_BracketLeft;
    88.     else if (keyname == ")")            return Qt::Key_BracketRight;
    89.     else if (keyname == "{")            return Qt::Key_BraceLeft;
    90.     else if (keyname == "}")            return Qt::Key_BraceRight;
    91.     else if (keyname == "\"")           return Qt::Key_QuoteDbl;
    92.     else if (keyname == "volup")        return Qt::Key_VolumeUp;
    93.     else if (keyname == "voldown")      return Qt::Key_VolumeDown;
    94.     else if (keyname == "mute")         return Qt::Key_VolumeMute;
    95.     else if (keyname == "search")       return Qt::Key_Search;
    96.     else if (keyname == "menu")         return Qt::Key_Menu;
    97.  
    98.     else if (keyname.length() >= 2)
    99.     {
    100.         if (keyname.startsWith('f'))
    101.         {
    102.             bool convertOK = false;
    103.             keyname = keyname.right(keyname.length()-1);
    104.             int findex = keyname.toInt(&convertOK);
    105.             if (convertOK)
    106.                 return (Qt::Key)(Qt::Key_F1 + (findex-1));
    107.         }
    108.     }
    109.     else
    110.     {
    111.         //a-z
    112.         if (keyname[0].unicode() >= 'a' && keyname[0].unicode() <= 'z')
    113.             return (Qt::Key)(Qt::Key_A + keyname[0].unicode() - 'a');
    114.  
    115.         //A-Z
    116.         if (keyname[0].unicode() >= 'A' && keyname[0].unicode() <= 'Z')
    117.             return (Qt::Key)(Qt::Key_A + keyname[0].unicode() - 'A');
    118.  
    119.         if (keyname[0].unicode() >= '0' && keyname[0].unicode() <= '9')
    120.             return (Qt::Key)(Qt::Key_0 + keyname[0].unicode() - 'a');
    121.     }
    122.  
    123.     return Qt::Key_unknown;
    124. }
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    Here is the keyboard.h file


    Qt Code: 
    1. #ifndef KEYBOARD_H
    2. #define KEYBOARD_H
    3.  
    4. #include <QObject>
    5. #include <QWidget>
    6.  
    7. class Keyboard : public QObject
    8. {
    9.     Q_OBJECT
    10.  
    11. public:
    12.  
    13.     Keyboard(QObject *parent = NULL);
    14.  
    15.     void setWidget(QWidget*);
    16.  
    17.     Q_INVOKABLE void simulateKey(QString keyName);
    18.  
    19. private:
    20.  
    21.     QWidget* theWidget;
    22.  
    23.     Qt::Key getKeyCodeFromName(QString keyname);
    24.  
    25. };
    26.  
    27. #endif // KEYBOARD_H
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    I hope someone can help me to solve this problem.
    Thank you
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  2. 19th December 2012, 08:29 #2
    Talei
    Talei is offline Advanced user
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    Default Re: Virtual Keyboard to website

    Your calculations are wrong:

    Qt Code: 
    1. //a-z
    2. if (keyname[0].unicode() >= 'a' && keyname[0].unicode() <= 'z')
    3. return (Qt::Key)(Qt::Key_A + keyname[0].unicode() - 'a');
    To copy to clipboard, switch view to plain text mode 

    it equals, for the a, to (dec) 65 + 97 - 65 == 97 == "A"

    Qt Code: 
    1. //A-Z
    2. if (keyname[0].unicode() >= 'A' && keyname[0].unicode() <= 'Z')
    3. return (Qt::Key)(Qt::Key_A + keyname[0].unicode() - 'A');
    To copy to clipboard, switch view to plain text mode 
    for the a, it's 65 + 97 - 65 == 97 == "a"

    also why don't You use this for the a-Z0-9?
    Qt Code: 
    1. return (Qt::Key)keyname[0].unicode();
    To copy to clipboard, switch view to plain text mode 
    In the near future - corporate networks reach out to the stars. Electrons and light flow throughout the universe.
    The advance of computerization however, has not yet wiped out nations and ethnic groups.
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