src/hbcore/inputfw/hbinputcontextproxy.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 04 Oct 2010 00:38:12 +0300
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permissions -rw-r--r--
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/****************************************************************************
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**
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (developer.feedback@nokia.com)
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**
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** This file is part of the HbCore module of the UI Extensions for Mobile.
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**
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this file.
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** Please review the following information to ensure the GNU Lesser General
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** Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at developer.feedback@nokia.com.
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**
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****************************************************************************/
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#include "hbinputcontextproxy_p.h"
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#include <hbwidget.h>
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#include <hbgraphicsscene.h>
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#include <hbinputfocusobject.h>
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#include <QGraphicsProxyWidget>
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#include <QGraphicsView>
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#include <hbinputmethod.h>
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#include <hbinputmethod_p.h>
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#include <hbinputsettingproxy.h>
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#include <hbinputmethodnull_p.h>
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/*!
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@stable
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@hbcore
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\class HbInputContextProxy
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\brief A proxy class forwarding calls from QInputContext to HbInputMethod
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This class is needed because Qt's input context system assumes the ownership
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of the installed context and deletes the old one when a new context is installed.
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HbInput framework wants to cache active input methods and keep the ownership of those
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objects. The proxy sits between QInputContext and HbInputMethod and is the one that
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is deleted when Qt level input context is switched.
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real implementation.
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Also a set of common events (such as Qt's input panel events) are handled on this level.
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This class is not needed outside of framework code.
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\sa QInputContext
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\sa HbInputMethod
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*/
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HbInputContextProxy::HbInputContextProxy(HbInputMethod *target) : mTarget(target)
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{
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}
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HbInputContextProxy::~HbInputContextProxy()
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{
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}
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/*!
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\internal
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\reimp
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*/
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QList<QAction *> HbInputContextProxy::actions()
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{
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    if (mTarget) {
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        return mTarget->actions();
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    }
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    return QList<QAction *>();
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}
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/*!
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\internal
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Returns true if given editor widget already has input framework focus.
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*/
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bool HbInputContextProxy::hasAlreadyInputFrameworkFocus(HbInputMethod *activeMethod, QObject *editorWidget) const
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{
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    if (activeMethod) {
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        HbInputFocusObject *focusObject = activeMethod->focusObject();
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        if (focusObject) {
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            return focusObject->object() == editorWidget;
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        }
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    }
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    return false;
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}
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/*!
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\internal
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Sets input framework focus to given widget if it is valid.
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*/
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void HbInputContextProxy::setInputFrameworkFocus(QObject *widget)
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{
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    if (mTarget) {
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        if (!widget) {
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            mTarget->setFocusObject(0);
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        } else if (HbInputFocusObject::isEditor(widget) && !HbInputFocusObject::isReadOnlyWidget(widget)) {
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            if (mTarget->focusObject() && mTarget->focusObject()->object() == widget) {
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                // Already focused to given widget.                 
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                return;
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            } 
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            mTarget->setFocusObject(mTarget->d_func()->createAndSetupFocusObject(widget));
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        }
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    }
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}
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/*!
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\internal
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\reimp
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*/
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bool HbInputContextProxy::filterEvent(const QEvent *event)
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{    
0
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    if (mTarget) {
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        bool focusLocked = mTarget->d_func()->mFocusLocked;
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        if (event->type() == QEvent::CloseSoftwareInputPanel && !focusLocked) {
0
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            setInputFrameworkFocus(0);
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            return true;
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        } else if (event->type() == QEvent::RequestSoftwareInputPanel && !focusLocked) {
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            if (QWidget *focusedWidget =  qApp->focusWidget()) {
0
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                // see if the focused widget is graphics view, if so get the focused graphics item in the view
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                // and acivate inputmethod for the focused graphics item
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                if (QGraphicsView *graphicsView = qobject_cast<QGraphicsView *>(focusedWidget)) {
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                    if (QGraphicsScene *scene = graphicsView->scene()) {
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                        if (QGraphicsItem *fItem = scene->focusItem()) {
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                            QGraphicsProxyWidget *proxy  = qgraphicsitem_cast<QGraphicsProxyWidget *>(fItem);
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                            if (proxy) {
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                                setInputFrameworkFocus(proxy->widget()->focusWidget());
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                            } else {
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                                setInputFrameworkFocus(static_cast<QGraphicsWidget *>(fItem));
0
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                            }
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                        }
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                    }
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                } else {
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                    // focused wiget is not graphics view, let see if it is native qt editor
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                    // and activate inputmethod for the focused widget
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                    setInputFrameworkFocus(focusedWidget);
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                }
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            }
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            return true;
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        }
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#ifdef Q_OS_SYMBIAN
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        const quint32 HbInputContextProxyExternalKeyboardModifier = 0x00200000;
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        if (event->type() == QEvent::QEvent::KeyPress || event->type() == QEvent::KeyRelease) {
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            const QKeyEvent *keyEvent = static_cast<const QKeyEvent *>(event);
0
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            if (keyEvent->nativeModifiers() & HbInputContextProxyExternalKeyboardModifier) {
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                // Operating system indicates that the event originated from an external keyboard.
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                // We let it pass here untouched.
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                if (mTarget) {
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                    mTarget->reset();
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                }
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                return false;
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            }
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        }
0
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#endif
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        if (event->type() == QEvent::KeyPress || event->type() == QEvent::KeyRelease) {
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            const QKeyEvent *keyEvent = static_cast<const QKeyEvent *>(event);
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            if (Qt::Key_unknown == keyEvent->key()) {
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                return false;
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            }
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        }
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        return mTarget->filterEvent(event);
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    } else {
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        if (event->type() == QEvent::RequestSoftwareInputPanel) {
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            // There is no mTarget. It means that someone is displaying something before
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            // the input framework was initialized. Acknowledge the situation so that
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            // the initializer knows to resend it. See HbApplication::initialize()
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            // method. The empty proxy is installed there.
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            HbInputMethodNull::Instance()->setDelayedPanelRequest(true);
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            return true;
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        }
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    }
0
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    return false;
0
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}
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/*!
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\internal
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\reimp
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*/
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QFont HbInputContextProxy::font() const
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{
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    if (mTarget) {
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        return mTarget->font();
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    }
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    return QFont();
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}
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/*!
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\internal
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\reimp
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*/
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QString HbInputContextProxy::identifierName()
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{
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    if (mTarget) {
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        return mTarget->identifierName();
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    }
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    return QString();
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}
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/*!
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\internal
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\reimp
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*/
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bool HbInputContextProxy::isComposing() const
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{
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    if (mTarget) {
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        return mTarget->isComposing();
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    }
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    return false;
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}
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/*!
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\internal
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\reimp
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*/
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QString HbInputContextProxy::language()
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{
0
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    if (mTarget) {
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        return mTarget->language();
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    }
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    return QString();
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}
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/*!
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\internal
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\reimp
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*/
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void HbInputContextProxy::mouseHandler(int x, QMouseEvent *event)
0
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{
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    if (mTarget) {
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        mTarget->mouseHandler(x, event);
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    }
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}
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/*!
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\internal
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\reimp
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*/
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void HbInputContextProxy::reset()
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{
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    if (mTarget) {
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        mTarget->reset();
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    }
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}
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/*!
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\internal
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\reimp
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*/
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void HbInputContextProxy::sendEvent(const QInputMethodEvent &event)
0
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{
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    if (mTarget) {
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        mTarget->sendEvent(event);
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    }
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}
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/*!
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\internal
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\reimp
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*/
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void HbInputContextProxy::update()
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{
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    if (mTarget) {
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        mTarget->update();
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    }
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}
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/*!
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\internal
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\reimp
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*/
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void HbInputContextProxy::widgetDestroyed(QWidget *widget)
0
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{
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    if (mTarget) {
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        mTarget->widgetDestroyed(widget);
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    }
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}
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/*!
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\internal
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\reimp
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*/
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void HbInputContextProxy::setFocusWidget(QWidget *widget)
0
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{
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    if (mTarget) {
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        mTarget->setFocusWidget(widget);
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    }
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}
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// End of file