QML VirtualKeyboard error to enter character to a website

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C++

Javascript

QT

I currently repairing some bugs on the Directory System.
This system has a Webview panel and also a virtual keyboard.
This system was developed by using QML, Javascript and 1% of C++.
The virtual keyboard has error in the codes. I entered lower case 'a',in the website textbox it will appear as upper-case'A'. And this happen to all the character from A to Z.

And another problem is when I entered Symbols, there will be weird character appearing in the textbox.

Here below source from Event Panel QML file.

//------------------------------------------------------
//                    Keyboard
//------------------------------------------------------

WebKeyboardPad
{
    id: keyboard
    x: 0
    y: event_panel.height + keyboard.height;
    anchors.horizontalCenter: parent.horizontalCenter
    onClicked: Globals.onKeyboardClicked(tag);
    onBackspace: Globals.onKeyboardBackspace();
    opacity: 1

    Behavior on y
    {
        id: behavior_nb_keyboard_y
        enabled: keyboard.isDragging
        NumberAnimation { duration: 300; }
    }
    Behavior on opacity
    {
        NumberAnimation { duration: 300; }
    }
}

This source is from a JavaScript file;

function onKeyboardClicked(keyName)
{
    home_main.onKeyboardClicked(keyName);
}

function onKeyboardBackspace()
{
    home_main.onKeyboardClicked("backspace");
}

This from Main QML file

//---------------------------------------------------
   // Custom plugins
   //---------------------------------------------------

   HardwareInfo
   {
       id: syshardware
   }

   function onKeyboardClicked(Keys)
   {
       myKeyboard.simulateKey(Keys);        //Injected in main.cpp
   }

   function onKeyboardBackspace(KeyNavigation)
   {
       myKeyboard.simulateKey(KeyNavigation);        //Injected in main.cpp
       //search_box.backspaceKey();
   }

Here the last one is the C++ file

keyboard.cpp

I got change the keyboard.cpp file but when I try which the c++ code change, the result still the same.

#include "keyboard.h"
#include <qevent>
#include <qkeyevent>
#include <qapplication>

Keyboard::Keyboard(QObject *parent) : QObject(parent)
{
    theWidget = NULL;
}

void Keyboard::setWidget(QWidget* theWidget)
{
    this->theWidget = theWidget;
}

void Keyboard::simulateKey(QString keyName)
{
    Qt::Key keycode = getKeyCodeFromName(keyName);
    if (keycode == Qt::Key_unknown || this->theWidget == NULL)
        return;

    //A-Z
    if (keyName.length() == 1 && keyName[0].unicode() >= 'A' && keyName[0].unicode() <= 'Z')
    {
        QKeyEvent keyPressEvent(QEvent::KeyPress, keycode, Qt::ShiftModifier);
        QApplication::sendEvent(this->theWidget, &keyPressEvent);

        QKeyEvent keyReleaseEvent(QEvent::KeyRelease, keycode, Qt::ShiftModifier);
        QApplication::sendEvent(this->theWidget, &keyReleaseEvent);
    }
    else
    {
        QKeyEvent keyPressEvent(QEvent::KeyPress, keycode, Qt::NoModifier);
        QApplication::sendEvent(this->theWidget, &keyPressEvent);

        QKeyEvent keyReleaseEvent(QEvent::KeyRelease, keycode, Qt::NoModifier);
        QApplication::sendEvent(this->theWidget, &keyReleaseEvent);
    }

    qDebug("Simulating key: %s", qPrintable(keyName));
}

Qt::Key Keyboard::getKeyCodeFromName(QString keyname)
{
    keyname = keyname.toLower();
    if (keyname.length() < 1)
        return Qt::Key_unknown;

    if (keyname == "left")              return Qt::Key_Left;
    else if (keyname == "right")        return Qt::Key_Right;
    else if (keyname == "up")           return Qt::Key_Up;
    else if (keyname == "down")         return Qt::Key_Down;
    else if (keyname == "center")       return Qt::Key_Enter;
    else if (keyname == "enter")        return Qt::Key_Enter;
    else if (keyname == "tab")          return Qt::Key_Tab;
    else if (keyname == "\n")           return Qt::Key_Enter;
    else if (keyname == "cpanel")       return Qt::Key_PageUp;
    else if (keyname == "widget")       return Qt::Key_PageDown;
    else if (keyname == "pgup")         return Qt::Key_PageUp;
    else if (keyname == "pgdown")       return Qt::Key_PageDown;
    else if (keyname == "pageup")       return Qt::Key_PageUp;
    else if (keyname == "pagedown")     return Qt::Key_PageDown;

    else if (keyname == "esc")          return Qt::Key_Escape;
    else if (keyname == "del")          return Qt::Key_Delete;
    else if (keyname == "delete")       return Qt::Key_Delete;
    else if (keyname == "backspace")    return Qt::Key_Backspace;
    else if (keyname == "space")        return Qt::Key_Space;
    else if (keyname == " ")            return Qt::Key_Space;
    else if (keyname == "+")            return Qt::Key_Plus;
    else if (keyname == "-")            return Qt::Key_Minus;
    else if (keyname == "*")            return Qt::Key_Asterisk;
    else if (keyname == "/")            return Qt::Key_Slash;
    else if (keyname == "\\")           return Qt::Key_Backslash;
    else if (keyname == ".")            return Qt::Key_Period;
    else if (keyname == ",")            return Qt::Key_Comma;
    else if (keyname == "?")            return Qt::Key_Question;
    else if (keyname == "<")            return Qt::Key_Less;
    else if (keyname == ">")            return Qt::Key_Greater;
    else if (keyname == "=")            return Qt::Key_Equal;
    else if (keyname == "@")            return Qt::Key_At;
    else if (keyname == "!")            return Qt::Key_Exclam;
    else if (keyname == "%")            return Qt::Key_Percent;
    else if (keyname == "$")            return Qt::Key_Dollar;
    else if (keyname == ":")            return Qt::Key_Colon;
    else if (keyname == ";")            return Qt::Key_Semicolon;
    else if (keyname == "(")            return Qt::Key_BracketLeft;
    else if (keyname == ")")            return Qt::Key_BracketRight;
    else if (keyname == "{")            return Qt::Key_BraceLeft;
    else if (keyname =&&&&= "}")            return Qt::Key_BraceRight;
    else if (keyname == "\"")           return Qt::Key_QuoteDbl;
    else if (keyname == "volup")        return Qt::Key_VolumeUp;
    else if (keyname == "voldown")      return Qt::Key_VolumeDown;
    else if (keyname == "mute")         return Qt::Key_VolumeMute;
    else if (keyname == "search")       return Qt::Key_Search;
    else if (keyname == "menu")         return Qt::Key_Menu;

    else if (keyname.length() >= 2)
    {
        if (keyname.startsWith('f'))
        {
            bool convertOK = false;
            keyname = keyname.right(keyname.length()-1);
            int findex = keyname.toInt(&convertOK);
            if (convertOK)
                return (Qt::Key)(Qt::Key_F1 + (findex-1));
        }
    }
    else
    {
        //a-z
        if (keyname[0].unicode() >= 'a' && keyname[0].unicode() <= 'z')
            return (Qt::Key)(Qt::Key_A + keyname[0].unicode() - 'a');

        //A-Z
        if (keyname[0].unicode() >= 'A' && keyname[0].unicode() <= 'Z')
            return (Qt::Key)(Qt::Key_A + keyname[0].unicode() - 'A');

        if (keyname[0].unicode() >= '0' && keyname[0].unicode() <= '9')
            return (Qt::Key)(Qt::Key_0 + keyname[0].unicode() - 'a');
    }

    return Qt::Key_unknown;
}

keyboard.h

#ifndef KEYBOARD_H
#define KEYBOARD_H

#include <QObject>
#include <QWidget>

class Keyboard : public QObject
{
    Q_OBJECT

public:

    Keyboard(QObject *parent = NULL);

    void setWidget(QWidget*);

    Q_INVOKABLE void simulateKey(QString keyName);

private:

    QWidget* theWidget;

    Qt::Key getKeyCodeFromName(QString keyname);

};

#endif // KEYBOARD_H

I have change the cpp file but it still does not work.
Hopefully someone can help me to solve this problem.
Thank you