Два вопроса по qt добавление виртуальной клавиатуры и как сделать невидимую кнопку

../tion28-pro/softwareinputcontextplugin.cpp: In member function ‘virtual SoftwareInputContext* SoftwareInputContextPlugin::create(const QString&)’:
../tion28-pro/softwareinputcontextplugin.cpp:12:76: warning: unused parameter ‘key’ [-Wunused-parameter]
 SoftwareInputContext *SoftwareInputContextPlugin::create ( const QString & key )
                                                                            ^~~
../tion28-pro/softwareinputcontextplugin.cpp: In member function ‘virtual QString SoftwareInputContextPlugin::description(const QString&)’:
../tion28-pro/softwareinputcontextplugin.cpp:22:67: warning: unused parameter ‘key’ [-Wunused-parameter]
 QString SoftwareInputContextPlugin::description ( const QString & key )
                                                                   ^~~
../tion28-pro/softwareinputcontextplugin.cpp: In member function ‘virtual QString SoftwareInputContextPlugin::displayName(const QString&)’:
../tion28-pro/softwareinputcontextplugin.cpp:31:67: warning: unused parameter ‘key’ [-Wunused-parameter]
 QString SoftwareInputContextPlugin::displayName ( const QString & key )
                                                                   ^~~
../tion28-pro/softwareinputcontextplugin.cpp: In member function ‘virtual QStringList SoftwareInputContextPlugin::languages(const QString&)’:
../tion28-pro/softwareinputcontextplugin.cpp:49:69: warning: unused parameter ‘key’ [-Wunused-parameter]
 QStringList SoftwareInputContextPlugin::languages ( const QString & key )

#ifndef SOFTWAREINPUTCONTEXT_H
#define SOFTWAREINPUTCONTEXT_H
#include <QInputContext>

class softwareinputpanel;

class SoftwareInputContext : public QInputContext

{

Q_OBJECT

public:

explicit SoftwareInputContext(QObject *parent = 0);

~SoftwareInputContext();

bool filterEvent(const QEvent* event);

QString identifierName();

QString language();

bool isComposing() const;

void reset();

private slots:

void sendCharacter(QChar character);

private:

void updatePosition();

private:

softwareinputpanel *inputPanel;

};

#endif // SOFTWAREINPUTCONTEXT_H

#ifndef SOFTWAREINPUTCONTEXTPLUGIN_H
#define SOFTWAREINPUTCONTEXTPLUGIN_H

#include <QtGui/QInputContextPlugin>

#include "softwareinputcontext.h"

class SoftwareInputContextPlugin : public QInputContextPlugin {

Q_OBJECT

public:

SoftwareInputContextPlugin(QObject *parent = 0);

SoftwareInputContext *create ( const QString & key );

QString description ( const QString & key );

QString displayName ( const QString & key );

QStringList keys () const;

QStringList languages ( const QString & key );

};

#endif // SOFTWAREINPUTCONTEXTPLUGIN_H

#ifndef SOFTWAREINPUTPANEL_H
#define SOFTWAREINPUTPANEL_H

#include <QWidget>
#include <QSignalMapper>

namespace Ui {
class softwareinputpanel;
}

class softwareinputpanel : public QWidget
{
    Q_OBJECT

public:
    explicit softwareinputpanel(QWidget *parent = 0);
    ~softwareinputpanel();
signals:
 void characterGenerated(QChar character);
protected:
 bool event(QEvent *e);
private slots:
 void saveFocusWidget(QWidget *oldFocus, QWidget *newFocus);
 void buttonClicked(QWidget *w);

private:
    QWidget *lastFocusedWidget;
    QSignalMapper signalMapper;
    Ui::softwareinputpanel *ui;
};

#endif // SOFTWAREINPUTPANEL_H

#-------------------------------------------------
#
# Project created by QtCreator 2019-08-10T18:35:24
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport

TARGET = tion28-pro
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0


SOURCES += main.cpp\
        mainwindow.cpp \
    graphwindow.cpp \
    menu_1.cpp \
    edited.cpp \
    softwareinputpanel.cpp \
    softwareinputcontext.cpp \
    softwareinputcontextplugin.cpp

HEADERS  += mainwindow.h \
    graphwindow.h \
    menu_1.h \
    edited.h \
    softwareinputpanel.h \
    softwareinputcontext.h \
    softwareinputcontextplugin.h

FORMS    += mainwindow.ui \
    graphwindow.ui \
    menu_1.ui \
    edited.ui \
    softwareinputpanel.ui

CONFIG += serialport

CONFIG += qwt

CONFIG += plugin
DESTDIR = $$[QT_INSTALL_PLUGINS]/inputmethods

target.path = /home/root
INSTALLS += target

#include "mainwindow.h"
#include <QApplication>
#include <QTextCodec>

#include<softwareinputpanel.h>
#include <QInputContextFactory>

int main(int argc, char *argv[])
{

    QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));

    QApplication a(argc, argv);

    a.setInputContext(QInputContextFactory::create("softwareinputpanel",&a));

    MainWindow w;
    w.setWindowFlags(Qt::FramelessWindowHint);
    w.show();

    return a.exec();
}

#include "mainwindow.h"
#include <QApplication>
#include <QTextCodec>

#include <softwareinputpanel.h>
#include <QInputContextFactory>


int main(int argc, char *argv[])
{

    QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));

    QApplication a(argc, argv);

   // a.setInputContext(QInputContextFactory::create("softwareinputpanel",&a));

    //MainWindow w;
    //w.setWindowFlags(Qt::FramelessWindowHint);
    //w.show();

    MainWindow w;
    softwareinputpanel * ic = new softwareinputpanel();
    a.setInputContext(ic);
    w.show();

    return a.exec();
}

../tion28-pro/main.cpp: In function ‘int main(int, char**)’:
../tion28-pro/main.cpp:26:25: error: no matching function for call to ‘QApplication::setInputContext(softwareinputpanel*&)’
     a.setInputContext(ic);
                         ^
In file included from ../work1/buildroot/output/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/include/QtGui/QApplication:1:0,
                 from ../tion28-pro/main.cpp:2:
../work1/buildroot/output/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/include/QtGui/qapplication.h:281:10: note: candidate: void QApplication::setInputContext(QInputContext*)
     void setInputContext(QInputContext *);
          ^~~~~~~~~~~~~~~
../work1/buildroot/output/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/include/QtGui/qapplication.h:281:10: note:   no known conversion for argument 1 from ‘softwareinputpanel*’ to ‘QInputContext*’

#include "mainwindow.h"
#include <QApplication>
#include <QTextCodec>

#include <softwareinputpanel.h>
#include <softwareinputcontext.h>
#include <QInputContextFactory>


int main(int argc, char *argv[])
{

    QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));

    QApplication a(argc, argv);

   // a.setInputContext(QInputContextFactory::create("softwareinputpanel",&a));

    //MainWindow w;
    //w.setWindowFlags(Qt::FramelessWindowHint);
    //w.show();

    MainWindow w;
    SoftwareInputContext * ic = new SoftwareInputContext();
    a.setInputContext(ic);
    w.show();

    return a.exec();
}

bool SoftwareInputContext::filterEvent(const QEvent* event)
{
if (event->type() == QEvent::RequestSoftwareInputPanel) {
    updatePosition();
    inputPanel->show();
    return true;
} else if (event->type() == QEvent::CloseSoftwareInputPanel) {
    inputPanel->hide();
    return true;
}
return false;
}

} else {

bool SoftwareInputContext::filterEvent(const QEvent* event)
{
*   if (event->type() == QEvent::RequestSoftwareInputPanel) {
    updatePosition();
    inputPanel->show();
    return true;
} else if (event->type() == QEvent::CloseSoftwareInputPanel) {
    inputPanel->hide();
    return true;
}
return false;
}

* брик поинт

void SoftKeyBoard::mousePressEvent(QMouseEvent *event)

  <connection>
   <sender>btn_close_</sender>
   <signal>clicked()</signal>
   <receiver>SoftKeyBoard</receiver>
   <slot>hide()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>114</x>
     <y>209</y>
    </hint>
    <hint type="destinationlabel">
     <x>83</x>
     <y>116</y>
    </hint>
   </hints>
  </connection>
 </connections>

<connections>
...
</connections>