Qt 4.8: myinputpanelcontext.cpp Example File (tools/inputpanel/myinputpanelcontext.cpp)

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# myinputpanelcontext.cpp Example File

tools/inputpanel/myinputpanelcontext.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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     ****************************************************************************/

     #include <QtCore>

     #include "myinputpanelcontext.h"

     MyInputPanelContext::MyInputPanelContext()
     {
         inputPanel = new MyInputPanel;
         connect(inputPanel, SIGNAL(characterGenerated(QChar)), SLOT(sendCharacter(QChar)));
     }

     MyInputPanelContext::~MyInputPanelContext()
     {
         delete inputPanel;
     }

     bool MyInputPanelContext::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;
     }

     QString MyInputPanelContext::identifierName()
     {
         return "MyInputPanelContext";
     }

     void MyInputPanelContext::reset()
     {
     }

     bool MyInputPanelContext::isComposing() const
     {
         return false;
     }

     QString MyInputPanelContext::language()
     {
         return "en_US";
     }

     void MyInputPanelContext::sendCharacter(QChar character)
     {
         QPointer<QWidget> w = focusWidget();

         if (!w)
             return;

         QKeyEvent keyPress(QEvent::KeyPress, character.unicode(), Qt::NoModifier, QString(character));
         QApplication::sendEvent(w, &keyPress);

         if (!w)
             return;

         QKeyEvent keyRelease(QEvent::KeyPress, character.unicode(), Qt::NoModifier, QString());
         QApplication::sendEvent(w, &keyRelease);
     }

     void MyInputPanelContext::updatePosition()
     {
         QWidget *widget = focusWidget();
         if (!widget)
             return;

         QRect widgetRect = widget->rect();
         QPoint panelPos = QPoint(widgetRect.left(), widgetRect.bottom() + 2);
         panelPos = widget->mapToGlobal(panelPos);
         inputPanel->move(panelPos);
     }