/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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**

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** rights.  These rights are described in the Nokia Qt LGPL Exception

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** $QT_END_LICENSE$

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****************************************************************************/

#include <qvarlengtharray.h>

#include <qwidget.h>

#include <private/qmacinputcontext_p.h>

#include "qtextformat.h"

#include <qdebug.h>

#include <private/qapplication_p.h>

#include <private/qkeymapper_p.h>

QT_BEGIN_NAMESPACE

extern bool qt_sendSpontaneousEvent(QObject*, QEvent*);

#if (MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_5)

#  define typeRefCon typeSInt32

#  define typeByteCount typeSInt32

#endif

QMacInputContext::QMacInputContext(QObject *parent)

    : QInputContext(parent), composing(false), recursionGuard(false), textDocument(0),

      keydownEvent(0)

{

//    createTextDocument();

}

QMacInputContext::~QMacInputContext()

{

#ifndef QT_MAC_USE_COCOA

    if(textDocument)

        DeleteTSMDocument(textDocument);

#endif

}

void

QMacInputContext::createTextDocument()

{

#ifndef QT_MAC_USE_COCOA

    if(!textDocument) {

        InterfaceTypeList itl = { kUnicodeDocument };

        NewTSMDocument(1, itl, &textDocument, SRefCon(this));

    }

#endif

}

QString QMacInputContext::language()

{

    return QString();

}

void QMacInputContext::mouseHandler(int pos, QMouseEvent *e)

{

#ifndef QT_MAC_USE_COCOA

    if(e->type() != QEvent::MouseButtonPress)

        return;

    if (!composing)

        return;

    if (pos < 0 || pos > currentText.length())

        reset();

    // ##### handle mouse position

#else

    Q_UNUSED(pos);

    Q_UNUSED(e);

#endif

}

#if !defined QT_MAC_USE_COCOA

static QTextFormat qt_mac_compose_format()

{

    QTextCharFormat ret;

    ret.setFontUnderline(true);

    return ret;

}

void QMacInputContext::reset()

{

    if (recursionGuard)

        return;

    if (!currentText.isEmpty()){

        QInputMethodEvent e;

        e.setCommitString(currentText);

        qt_sendSpontaneousEvent(focusWidget(), &e);

        currentText = QString();

    }

    recursionGuard = true;

    createTextDocument();

    composing = false;

    ActivateTSMDocument(textDocument);

    FixTSMDocument(textDocument);

    recursionGuard = false;

}

bool QMacInputContext::isComposing() const

{

    return composing;

}

#endif

void QMacInputContext::setFocusWidget(QWidget *w)

{

    createTextDocument();

#ifndef QT_MAC_USE_COCOA

    if(w)

        ActivateTSMDocument(textDocument);

    else

        DeactivateTSMDocument(textDocument);

#endif

    QInputContext::setFocusWidget(w);

}

#ifndef QT_MAC_USE_COCOA

static EventTypeSpec input_events[] = {

    { kEventClassTextInput, kEventTextInputUnicodeForKeyEvent },

    { kEventClassTextInput, kEventTextInputOffsetToPos },

    { kEventClassTextInput, kEventTextInputUpdateActiveInputArea }

};

static EventHandlerUPP input_proc_handlerUPP = 0;

static EventHandlerRef input_proc_handler = 0;

#endif

void

QMacInputContext::initialize()

{

#ifndef QT_MAC_USE_COCOA

    if(!input_proc_handler) {

        input_proc_handlerUPP = NewEventHandlerUPP(QMacInputContext::globalEventProcessor);

        InstallEventHandler(GetApplicationEventTarget(), input_proc_handlerUPP,

                            GetEventTypeCount(input_events), input_events,

                            0, &input_proc_handler);

    }

#endif

}

void

QMacInputContext::cleanup()

{

#ifndef QT_MAC_USE_COCOA

    if(input_proc_handler) {

        RemoveEventHandler(input_proc_handler);

        input_proc_handler = 0;

    }

    if(input_proc_handlerUPP) {

        DisposeEventHandlerUPP(input_proc_handlerUPP);

        input_proc_handlerUPP = 0;

    }

#endif

}

void QMacInputContext::setLastKeydownEvent(EventRef event)

{

    EventRef tmpEvent = keydownEvent;

    keydownEvent = event;

    if (keydownEvent)

        RetainEvent(keydownEvent);

    if (tmpEvent)

        ReleaseEvent(tmpEvent);

}

OSStatus

QMacInputContext::globalEventProcessor(EventHandlerCallRef, EventRef event, void *)

{

#ifndef QT_MAC_USE_COCOA

    QScopedLoopLevelCounter loopLevelCounter(QApplicationPrivate::instance()->threadData);

    SRefCon refcon = 0;

    GetEventParameter(event, kEventParamTextInputSendRefCon, typeRefCon, 0,

                      sizeof(refcon), 0, &refcon);

    QMacInputContext *context = reinterpret_cast<QMacInputContext*>(refcon);

    bool handled_event=true;

    UInt32 ekind = GetEventKind(event), eclass = GetEventClass(event);

    switch(eclass) {

    case kEventClassTextInput: {

        handled_event = false;

        QWidget *widget = QApplicationPrivate::focus_widget;

        bool canCompose = widget && (!context || widget->inputContext() == context)

                && !(widget->inputMethodHints() & Qt::ImhDigitsOnly

                || widget->inputMethodHints() & Qt::ImhFormattedNumbersOnly

                || widget->inputMethodHints() & Qt::ImhHiddenText);

        if(!canCompose) {

            handled_event = false;

        } else if(ekind == kEventTextInputOffsetToPos) {

            if(!widget->testAttribute(Qt::WA_InputMethodEnabled)) {

                handled_event = false;

                break;

            }

            QRect mr(widget->inputMethodQuery(Qt::ImMicroFocus).toRect());

            QPoint mp(widget->mapToGlobal(QPoint(mr.topLeft())));

            Point pt;

            pt.h = mp.x();

            pt.v = mp.y() + mr.height();

            SetEventParameter(event, kEventParamTextInputReplyPoint, typeQDPoint,

                              sizeof(pt), &pt);

            handled_event = true;

        } else if(ekind == kEventTextInputUpdateActiveInputArea) {

            if(!widget->testAttribute(Qt::WA_InputMethodEnabled)) {

                handled_event = false;

                break;

            }

            if (context->recursionGuard)

                break;

            ByteCount unilen = 0;

            GetEventParameter(event, kEventParamTextInputSendText, typeUnicodeText,

                              0, 0, &unilen, 0);

            UniChar *unicode = (UniChar*)NewPtr(unilen);

            GetEventParameter(event, kEventParamTextInputSendText, typeUnicodeText,

                              0, unilen, 0, unicode);

            QString text((QChar*)unicode, unilen / sizeof(UniChar));

            DisposePtr((char*)unicode);

            ByteCount fixed_length = 0;

            GetEventParameter(event, kEventParamTextInputSendFixLen, typeByteCount, 0,

                              sizeof(fixed_length), 0, &fixed_length);

            if(fixed_length == ULONG_MAX || fixed_length == unilen) {

                QInputMethodEvent e;

                e.setCommitString(text);

                context->currentText = QString();

                qt_sendSpontaneousEvent(context->focusWidget(), &e);

                handled_event = true;

                context->reset();

            } else {

                ByteCount rngSize = 0;

                OSStatus err = GetEventParameter(event, kEventParamTextInputSendHiliteRng, typeTextRangeArray, 0,

                                                 0, &rngSize, 0);

                QVarLengthArray<TextRangeArray> highlight(rngSize);

                if (noErr == err) {

                    err = GetEventParameter(event, kEventParamTextInputSendHiliteRng, typeTextRangeArray, 0,

                                            rngSize, &rngSize, highlight.data());

                }

                context->composing = true;

                if(fixed_length > 0) {

                    const int qFixedLength = fixed_length / sizeof(UniChar);

                    QList<QInputMethodEvent::Attribute> attrs;

                    attrs << QInputMethodEvent::Attribute(QInputMethodEvent::TextFormat,

                                                          qFixedLength, text.length()-qFixedLength,

                                                          qt_mac_compose_format());

                    QInputMethodEvent e(text, attrs);

                    context->currentText = text;

                    e.setCommitString(text.left(qFixedLength), 0, qFixedLength);

                    qt_sendSpontaneousEvent(widget, &e);

                    handled_event = true;

                } else {

                    /* Apple's enums that they have removed from Tiger :(

                    enum {

                        kCaretPosition = 1,

                        kRawText = 2,

                        kSelectedRawText = 3,

                        kConvertedText = 4,

                        kSelectedConvertedText = 5,

                        kBlockFillText = 6,

                        kOutlineText = 7,

                        kSelectedText = 8

                    };

                    */

#ifndef kConvertedText

#define kConvertedText 4

#endif

#ifndef kCaretPosition

#define kCaretPosition 1

#endif

                    QList<QInputMethodEvent::Attribute> attrs;

                    if (!highlight.isEmpty()) {

                        TextRangeArray *data = highlight.data();

                        for (int i = 0; i < data->fNumOfRanges; ++i) {

                            int start = data->fRange[i].fStart / sizeof(UniChar);

                            int len = (data->fRange[i].fEnd - data->fRange[i].fStart) / sizeof(UniChar);

                            if (data->fRange[i].fHiliteStyle == kCaretPosition) {

                                attrs << QInputMethodEvent::Attribute(QInputMethodEvent::Cursor, start, 0, QVariant());

                                continue;

                            }

                            QTextCharFormat format;

                            format.setFontUnderline(true);

                            if (data->fRange[i].fHiliteStyle == kConvertedText)

                                format.setUnderlineColor(Qt::gray);

                            else

                                format.setUnderlineColor(Qt::black);

                            attrs << QInputMethodEvent::Attribute(QInputMethodEvent::TextFormat, start, len, format);

                        }

                    } else {

                        attrs << QInputMethodEvent::Attribute(QInputMethodEvent::TextFormat,

                                0, text.length(), qt_mac_compose_format());

                    }

                    context->currentText = text;

                    QInputMethodEvent e(text, attrs);

                    qt_sendSpontaneousEvent(widget, &e);

                    handled_event = true;

                }

            }

#if 0

            if(!context->composing)

                handled_event = false;

#endif

            extern bool qt_mac_eat_unicode_key; //qapplication_mac.cpp

            qt_mac_eat_unicode_key = handled_event;

        } else if(ekind == kEventTextInputUnicodeForKeyEvent) {

            EventRef key_ev = 0;

            GetEventParameter(event, kEventParamTextInputSendKeyboardEvent, typeEventRef, 0,

                              sizeof(key_ev), 0, &key_ev);

            QString text;

            ByteCount unilen = 0;

            if(GetEventParameter(key_ev, kEventParamKeyUnicodes, typeUnicodeText, 0, 0, &unilen, 0) == noErr) {

                UniChar *unicode = (UniChar*)NewPtr(unilen);

                GetEventParameter(key_ev, kEventParamKeyUnicodes, typeUnicodeText, 0, unilen, 0, unicode);

                text = QString((QChar*)unicode, unilen / sizeof(UniChar));

                DisposePtr((char*)unicode);

            }

            unsigned char chr = 0;

            GetEventParameter(key_ev, kEventParamKeyMacCharCodes, typeChar, 0, sizeof(chr), 0, &chr);

            if(!chr || chr >= 128 || (text.length() > 0 && (text.length() > 1 || text.at(0) != QLatin1Char(chr))))

                handled_event = !widget->testAttribute(Qt::WA_InputMethodEnabled);

            QMacInputContext *context = qobject_cast<QMacInputContext*>(qApp->inputContext());

            if (context && context->lastKeydownEvent()) {

                qt_keymapper_private()->translateKeyEvent(widget, 0, context->lastKeydownEvent(),

                                                          0, false);

                context->setLastKeydownEvent(0);

            }

        }

        break; }

    default:

        break;

    }

    if(!handled_event) //let the event go through

        return eventNotHandledErr;

#else

    Q_UNUSED(event);

#endif

    return noErr; //we eat the event

}

QT_END_NAMESPACE