How to add third party plug in qt ?

[Qt embedded developer]

@SGaist i have installed florence keyboard on my target device.

on pc my on_lineEdit_Title_textChanged slot get called when i click on virtual keyboard key. But on target device it not take input.

i have written below code :

#include "main_keyboard.h"
#include "ui_main_keyboard.h"


#define KEYBOARD_CMD        "florence"
#define SPLITTER_START_Y    310

Main_keyboard::Main_keyboard(QWidget *parent, MainKeyboardType eMainKeyboardType , UINT8 u8StringLimit, QString sDisplayData) :
    QWidget(parent),
    ui(new Ui::Main_keyboard)
{
    ui->setupUi(this);
    FUNCTION_IN;
    eLangWhileKayboardOpen = (LanguageItem)pMainApp.ObjStationInfo.sCurrentLanguage.toUInt();

    

    if(eLangWhileKayboardOpen == LAN_ENGLISH)
    {
        /* Design keyboard dynamically */
        AddKeyBoardButton();
    }
    else
    {
        bIsVirtualKeyboardOpen = false;
        //Delete Keyframe and removed two buttons
        delete(ui->frame);
        ui->splitter->setGeometry(QRect(56,SPLITTER_START_Y,368,80));
        ui->lineEdit_Title->setGeometry(QRect(56, SPLITTER_START_Y-45,368,45));
        ui->Label_Main->setGeometry(56, SPLITTER_START_Y-45-70, 365, 70);
        ui->pushButton_Exit->setGeometry(388, SPLITTER_START_Y-45-70-45+11, 70, 70);

        delete(ui->pushButton_Backspace);
        delete(ui->pushButton_Caps);
        ui->pushButton_Save->setFixedWidth(368);

        OpenVirtualKeyboard();
        if(bIsVirtualKeyboardOpen)
        {
            ChangeKeyboardLanguage(eLangWhileKayboardOpen);
        }
    }

    QFont font;
    font.setFamily(FONT_FAMILY_AWESOME);
    font.setPixelSize(BACK_BUTTON_FONTSIZE);

    //ui->pushButton_Exit->setFont(font);
    //ui->pushButton_Exit->setText(CLEAR_BUTTON_FONT);

    ui->pushButton_Save->setEnabled(false);

    sTypedData = sDisplayData;
    ui->lineEdit_Title->setFocus();
    ui->lineEdit_Title->setText (sTypedData);
    ui->lineEdit_Title->setCursorPosition(sTypedData.length());

    eReceivedMainKeyboardType = eMainKeyboardType;
    bCapsOn = false;

    switch(eMainKeyboardType)
    {
    case KEYBOARD_USER_NAME:
    {
        ui->pushButton_Save->setStyleSheet(SAVEBUTTONSytesheetEnable);
        ui->Label_Main->setText((sEnterName()));                      // "ENTER NAME");

        if(eLangWhileKayboardOpen == LAN_ENGLISH)
        {
            SetLowercaseButton();
            keyButton[ZERO_KEY_INDEX]->hide();
        }
    }
        break;

    case KEYBOARD_WIFI_PASSWORD:
    {
        ui->pushButton_Save->setStyleSheet(ENTERBUTTONStylesheet);
        ui->Label_Main->setText((sEnterPassword()));                  // "ENTER PASSWORD");

        if(eLangWhileKayboardOpen == LAN_ENGLISH)
            SetLowercaseButton();
    }
        break;

    case KEYBOARD_LOT_NUMBER:
    {
        ui->pushButton_Save->setStyleSheet(ENTERBUTTONStylesheet);
        ui->Label_Main->setText(sEnterLotNumber());            //"ENTER LOT NUMBER");

        if(eLangWhileKayboardOpen == LAN_ENGLISH)
            SetLowercaseButton();
    }
        break;

    case KEYBOARD_PART_NUMBER:
    {
        ui->pushButton_Save->setStyleSheet(ENTERBUTTONStylesheet);
        ui->Label_Main->setText(sEnterPartNumber());          //"ENTER PART NUMBER");

        if(eLangWhileKayboardOpen == LAN_ENGLISH)
            SetLowercaseButton();
    }

        break;

    case MAX_MAIN_KEYBOARD:
    default:
        break;

    }
    u8WordLimit = u8StringLimit;
    FUNCTION_OUT;
}

Main_keyboard::~Main_keyboard()
{
    if(eLangWhileKayboardOpen != LAN_ENGLISH)
        CloseVirtualKeyboard();
    delete ui;
}

void Main_keyboard::AddKeyBoardButton()
{
    FUNCTION_IN;
    UINT8 u8MenuItemIndex, u8RowIndex, u8ColumnIndex;
    QGridLayout *controlsLayout = new QGridLayout;

    for(u8MenuItemIndex = 0; u8MenuItemIndex < MAX_KEY; u8MenuItemIndex++)
    {
        u8RowIndex = u8MenuItemIndex / KEYS_PER_ROW;
        u8ColumnIndex = u8MenuItemIndex % KEYS_PER_ROW;

        //Add PushButton
        keyButton[u8MenuItemIndex] = new QPushButton();
        keyButton[u8MenuItemIndex]->setObjectName(QString::number(u8MenuItemIndex));
        keyButton[u8MenuItemIndex]->setMinimumHeight(KEYBOARD_BUTTON_HEIGHT);
        keyButton[u8MenuItemIndex]->setMinimumWidth(KEYBOARD_BUTTON_WIDTH);
        keyButton[u8MenuItemIndex]->setFlat(true);
        keyButton[u8MenuItemIndex]->setStyleSheet ("border: 0px solid black;font-family:'Open Sans';font-weight:600;font-size:12pt;");
        QObject::connect(keyButton[u8MenuItemIndex], &QPushButton::released, this, &Main_keyboard::onKeyRelease);

        //Add Pushbutton in GridLayout
        controlsLayout-> addWidget(keyButton[u8MenuItemIndex], u8RowIndex, u8ColumnIndex, 1, 1, Qt::AlignCenter);
    }
    controlsLayout->setMargin(0);
    controlsLayout->setHorizontalSpacing(0);
    controlsLayout->setVerticalSpacing(0);

    ui->verticalLayout->addLayout(controlsLayout);
    FUNCTION_OUT;
}

void Main_keyboard::SetUppercaseButton()
{    
    ui->pushButton_Caps->setStyleSheet(CAPS_LOCK_ON_COLOR);
    bCapsOn = true;
    if(eLangWhileKayboardOpen == LAN_ENGLISH)
    {
        for(UINT8 u8ButtonIndex = 0; u8ButtonIndex < MAX_KEY; u8ButtonIndex++)
        {
            keyButton[u8ButtonIndex]->setText(sUpperKey[u8ButtonIndex]);
        }
    }
}

void Main_keyboard::SetLowercaseButton()
{
    ui->pushButton_Caps->setStyleSheet(CAPS_LOCK_OFF_COLOR);
    bCapsOn = false;
    if(eLangWhileKayboardOpen == LAN_ENGLISH)
    {
        for(UINT8 u8ButtonIndex = 0; u8ButtonIndex < MAX_KEY; u8ButtonIndex++)
        {
            keyButton[u8ButtonIndex]->setText(sLowerKey[u8ButtonIndex]);
        }
    }
}

void Main_keyboard::onKeyRelease()
{
    QObject *senderObj = sender();
    QString senderObjName = senderObj->objectName();
    u_int8_t u8MenuItemIndex = senderObjName.toInt();

    if(u8MenuItemIndex == SPACE_KEY_INDEX)
    {
        GetEntry(" ");
    }
    else
    {
        GetEntry(keyButton[u8MenuItemIndex]->text());
    }
}

void Main_keyboard::GetEntry(QString get_char)
{
    if(sTypedData.length() < u8WordLimit)
    {
        u8CursorPosition = ui->lineEdit_Title->cursorPosition();
        sTypedData.insert(u8CursorPosition , get_char.at(0));
        ui->lineEdit_Title->setText (sTypedData);
        ui->lineEdit_Title->setCursorPosition(++u8CursorPosition);
    }
}

void Main_keyboard::on_lineEdit_Title_textChanged(const QString &arg1)
{
#ifdef QDEBUG_ENABLE
    pMainApp.ObjStationInfo.DebugStation("Text Changed: "   + arg1 + "length" + sTypedData.length());
#endif
    sTypedData= arg1;

    if(sTypedData.isEmpty())
        ui->pushButton_Save->setEnabled(false);
    else
        ui->pushButton_Save->setEnabled(true);

    if(sTypedData.length() > u8WordLimit)
    {
        u8CursorPosition = ui->lineEdit_Title->cursorPosition();
        sTypedData.remove(u8CursorPosition ,1);
        ui->lineEdit_Title->setText (sTypedData);
        ui->lineEdit_Title->setCursorPosition(--u8CursorPosition);
    }
    ui->lineEdit_Title->repaint();
}


void Main_keyboard::on_pushButton_Caps_released()
{
    //border: 3px solid black;background:rgb(0, 85, 127);color: rgb(255, 255, 255);  //white
    //border: 3px solid black;background:rgb(0, 85, 127);color: rgb(0, 0, 0); //black
    if(eLangWhileKayboardOpen == LAN_ENGLISH)
    {
        if(bCapsOn ==false)
        {
            SetUppercaseButton();
        }
        else
        {
            SetLowercaseButton();
        }
    }
}

void Main_keyboard::on_pushButton_Backspace_released()
{
    if(eLangWhileKayboardOpen == LAN_ENGLISH)
    {
        if(sTypedData.length()>0)
        {
            u8CursorPosition = ui->lineEdit_Title->cursorPosition();
            sTypedData.remove(--u8CursorPosition , 1);
            ui->lineEdit_Title->setText (sTypedData);
            ui->lineEdit_Title->setCursorPosition(u8CursorPosition);
        }
    }
}

void Main_keyboard::on_pushButton_Exit_released()
{
    CloseVirtualKeyboard();
    this->close();
    delete this;
}

void Main_keyboard::on_pushButton_Save_released()
{
    qApp->setOverrideCursor(QCursor( Qt::WaitCursor));

    switch(eReceivedMainKeyboardType)
    {
    case KEYBOARD_USER_NAME:
        break;

    case KEYBOARD_WIFI_PASSWORD:
    {
        Network_Setting* parent = qobject_cast<Network_Setting*>(this->parent());
        parent->SaveConnectNetWork(parent->sSelectedSsid ,sTypedData, "1", true);
    }
        break;


    case KEYBOARD_LOT_NUMBER:
    {
        Cal_Gas_Information* parent = qobject_cast<Cal_Gas_Information*>(this->parent());
        parent->DisplayLotNumber(sTypedData);
    }
        break;

    case KEYBOARD_PART_NUMBER:
    {
        Cal_Gas_Information* parent = qobject_cast<Cal_Gas_Information*>(this->parent());
        parent->DisplayPartNumber(sTypedData);
    }
        break;

    case MAX_MAIN_KEYBOARD:
    default:
        break;
    }
#ifdef BOARD_APP
    qApp->setOverrideCursor(QCursor( Qt::BlankCursor));
#else
    qApp->setOverrideCursor(QCursor(Qt::ArrowCursor));
#endif

    if(eLangWhileKayboardOpen != LAN_ENGLISH)
        CloseVirtualKeyboard();

    this->close();
    delete this;
}

//void Main_keyboard::on_pushButton_Clear_released()
//{
//    sTypedData.clear();
//    ui->lineEdit_Title->clear();
//}

void Main_keyboard::on_lineEdit_Title_cursorPositionChanged(int , int )
{
    if(eLangWhileKayboardOpen != LAN_ENGLISH)
    {
        if(bIsVirtualKeyboardOpen == false)
        {
            OpenVirtualKeyboard();
            ChangeKeyboardLanguage((LanguageItem)pMainApp.ObjStationInfo.sCurrentLanguage.toUInt());
        }
    }
}


void Main_keyboard::ChangeKeyboardLanguage(LanguageItem eLanguageItem)
{
    QString sResponse, sError;
    bool bIsCmdFailed = false;
    QString sLocale;

    switch(eLanguageItem)
    {
    case LAN_ENGLISH:
    case MAX_LANGUAGE:
    default:
        sLocale = "us";
        break;

    case LAN_TURKISH:
        sLocale = "tr";
        break;
    }

    QString sKeyLanChangeCmd = QString("%1 %2").arg("setxkbmap", sLocale);
    do
    {
        bIsCmdFailed = pMainApp.ObjSysOperation.SendSystemCommand(sKeyLanChangeCmd, sResponse, sError);
        if(bIsCmdFailed)
        {
            AppLog::AddLog(LOG_ERROR, __FUNCTION__, __LINE__, "Failed to set Language");
#ifdef QDEBUG_ENABLE
            pMainApp.ObjStationInfo.DebugStation("Failed to set Language");
#endif
            break;
        }
        else
        {

        }
    }while(false);
}

void Main_keyboard::OpenVirtualKeyboard()
{
    QString sResponse, sError;
    bool bIsCmdFailed = false;

    do
    {
        if(!bIsVirtualKeyboardOpen)
        {
            //bIsCmdFailed = SendSystemCommand(KEYBOARD_CMD" &", sResponse, sError);
            bIsCmdFailed = pMainApp.ObjSysOperation.SendSystemCommand("florence -u /usr/share/florence/florence.conf &", sResponse, sError);
            if(bIsCmdFailed)
            {
                AppLog::AddLog(LOG_ERROR, __FUNCTION__, __LINE__, "Failed to open florence keyboard");
#ifdef QDEBUG_ENABLE
                pMainApp.ObjStationInfo.DebugStation("Failed to open florence keyboard");
#endif
                break;
            }
            else
            {
                bIsVirtualKeyboardOpen = true;
            }
        }
    }while(false);
}

void Main_keyboard::CloseVirtualKeyboard()
{
    ChangeKeyboardLanguage(LAN_ENGLISH);

    QString sResponse, sError;
    pMainApp.ObjSysOperation.SendSystemCommand("pkill "KEYBOARD_CMD, sResponse, sError);
    bIsVirtualKeyboardOpen = false;
}

[SGaist]

Are you sure that that keyboard is working properly on your target ?
By the way, did you consider Qt's own Virtual Keyboard module ?

[Qt embedded developer]

@SGaist it get open but not take i/p.

Why it just get open but not take i/p?

Yes I started to use qt keyboard. But i am not much more about it.

What library I need to install on linux? How to use it?

How I can add it on my existing program with minimum steps?

Note that i want virtual keyboard to use on qt c++ based. Not on qt qml based.

Thanks for reply

[SGaist]

Can you give more information about that Florence keyboard ?
Some documentation link, sources, etc ?

[SGaist]

As for C++, did you try to simply use it with a minimal widget application ?

[Qt embedded developer]

@SGaist to use qt virtual keyboard

What library I need to install on linux? How to use it?

How I can add it on my existing program with minimum steps?

Note that i want virtual keyboard to use on qt c++ based. Not on qt qml based.

[Qt embedded developer]

@SGaist link for Florence keyboard

http://florence.sourceforge.net/english.html

I have installed it on pc. On pc my code is working fine but on target device it is not working

[SGaist]

@Qt-embedded-developer said in How to add third party plug in qt ?:

@SGaist to use qt virtual keyboard

What library I need to install on linux? How to use it?

How I can add it on my existing program with minimum steps?

Note that i want virtual keyboard to use on qt c++ based. Not on qt qml based.

Did you read the documentation page I linked ? The one that explains the module, provides a link to installation / build instructions, etc ?

[Qt embedded developer]

@SGaist Can i use it on Qt version 5.5.1 as open source code?

I have already installed qt on my linux pc. How to install packages related to virtual keyboard on my pc? From where i can find qt maintenance tool on linux ?

[jsulm]

@Qt-embedded-developer said in How to add third party plug in qt ?:

From where i can find qt maintenance tool on linux ?

Install Qt using Qt Online Installer, then you will also get maintenance tool.

[Qt embedded developer]

@jsulm if I want to install on existing version of qt then how to install it on linux with out qt online installer

[SGaist]

Then use something more recent to run in your board. Qt 5.5 is more than 10 minor releases behind. Yocto comes to mind for example.

[Qt embedded developer]

@SGaist sorry but can you elaborate more your reply. Because I am novice to understand your reply.

[SGaist]

Current Qt versions is Qt 5.15.2 for OpenSource for the Qt 5 series and 6.2 is around the corner for the Qt 6 series.

Qt 5.5.1 was released in September 2015 so that 6 years ago. Therefore it's not a good idea to start a new project with it.

As for Yocto, you should read the project description.