qinputcontext.cpp

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/****************************************************************************
**
** Implementation of QInputContext class
**
** Copyright (C) 2003-2004 immodule for Qt Project.  All rights reserved.
**
** This file is written to contribute to Nokia Corporation and/or its subsidiary(-ies) under their own
** license. You may use this file under your Qt license. Following
** description is copied from their original file headers. Contact
** immodule-qt@freedesktop.org if any conditions of this licensing are
** not clear to you.
**
****************************************************************************/

//#define QT_NO_IM_PREEDIT_RELOCATION

#include "qinputcontext.h"
#include "qinputcontext_p.h"

#ifndef QT_NO_IM

#include "qplatformdefs.h"

#include "qapplication.h"
#include "qmenu.h"
#include "qtextformat.h"
#include "qpalette.h"

#include <stdlib.h>
#include <limits.h>

QT_BEGIN_NAMESPACE

QInputContext::QInputContext(QObject* parent)
    : QObject(*new QInputContextPrivate, parent)
{
}


QInputContext::~QInputContext()
{
}

QWidget *QInputContext::focusWidget() const
{
    Q_D(const QInputContext);
    return d->focusWidget;
}


void QInputContext::setFocusWidget(QWidget *widget)
{
    Q_ASSERT(!widget || widget->testAttribute(Qt::WA_InputMethodEnabled));
    Q_D(QInputContext);
    d->focusWidget = widget;
}

bool QInputContext::filterEvent(const QEvent * /*event*/)
{
    return false;
}

void QInputContext::sendEvent(const QInputMethodEvent &event)
{
    // route events over input context parents to make chaining possible.
    QInputContext *p = qobject_cast<QInputContext *>(parent());
    if (p) {
        p->sendEvent(event);
        return;
    }

    QWidget *focus = focusWidget();
    if (!focus)
    return;

    QInputMethodEvent e(event);
    QApplication::sendEvent(focus, &e);
}


void QInputContext::mouseHandler(int /*x*/, QMouseEvent *event)
{
    // Default behavior for simple ephemeral input contexts. Some
    // complex input contexts should not be reset here.
    if (event->type() == QEvent::MouseButtonPress || event->type() == QEvent::MouseButtonDblClick)
    reset();
}


QFont QInputContext::font() const
{
    Q_D(const QInputContext);
    if (!d->focusWidget)
        return QApplication::font();

    return qvariant_cast<QFont>(d->focusWidget->inputMethodQuery(Qt::ImFont));
}

void QInputContext::update()
{
}

void QInputContext::widgetDestroyed(QWidget *widget)
{
    Q_D(QInputContext);
    if (widget == d->focusWidget)
        setFocusWidget(0);
}

QList<QAction *> QInputContext::actions()
{
    return QList<QAction *>();
}

QTextFormat QInputContext::standardFormat(StandardFormat s) const
{
    QWidget *focus = focusWidget();
    const QPalette &pal = focus ? focus->palette() : QApplication::palette();

    QTextCharFormat fmt;
    QColor bg;
    switch (s) {
    case QInputContext::PreeditFormat: {
        fmt.setUnderlineStyle(QTextCharFormat::DashUnderline);
        break;
    }
    case QInputContext::SelectionFormat: {
        bg = pal.text().color();
        fmt.setBackground(QBrush(bg));
        fmt.setForeground(pal.background());
        break;
    }
    }
    return fmt;
}

#ifdef Q_WS_X11

bool QInputContext::x11FilterEvent(QWidget * /*keywidget*/, XEvent * /*event*/)
{
    return false;
}
#endif // Q_WS_X11

#ifdef Q_OS_SYMBIAN

bool QInputContext::symbianFilterEvent(QWidget * /*keywidget*/, const QSymbianEvent * /*event*/)
{
    return false;
}
#endif // Q_OS_SYMBIAN

QT_END_NAMESPACE

#endif //Q_NO_IM