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

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

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     Nokia Corporation - initial implementation

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

#include <QEvent>

#include <QPaintEvent>

#include <QRect>

#include <org_eclipse_swt_internal_qt_OS.h>

#include "eventcallback.h"

#include "swtlog.h"

#include "jniutils.h"

#include "swt.h"

#include "swtapplication.h"

using namespace Java::eSWT;

EventCallback::EventCallback()

    : mEventFilterCallsActive(0),

      mDestroying(false), 

      mJniUtils(swtApp->jniUtils())

    {

    SWT_LOG_FUNC_CALL();

    }

EventCallback::~EventCallback()

    {

    SWT_LOG_FUNC_CALL();

    Q_ASSERT( mEventFilterCallsActive == 0 );

    }

void EventCallback::Destroy()

    {

    SWT_LOG_FUNC_CALL();

    SWT_LOG_DATA_1("Active event filter calls=%d", mEventFilterCallsActive);

    mDestroying = true;

    if( mEventFilterCallsActive == 0 )

        {

        delete this;

        }

    }

bool EventCallback::eventFilter(QObject* aObj, QEvent* aEvent)

    {

    return eventFilter(aObj, aEvent, -1);

    }

bool EventCallback::eventFilter(QObject* aObj, QEvent* aEvent, const int& aSwtEventType)

    {

    SWT_LOG_FUNC_CALL();

    SWT_LOG_DATA_1("Active event filter calls=%d", mEventFilterCallsActive + 1);

    ++mEventFilterCallsActive;

    bool returnCode = eventToJava( aObj, aEvent, aSwtEventType );

    if( --mEventFilterCallsActive == 0 && mDestroying )

        {

        delete this;

        }

    return returnCode;

    }

/*

 * Note that if event is cancelled here then it won't be passed to object event

 * filters or the QObject::event. If you need to hook into event loop after

 * event has been fully processed then it should be done in notify().

 */

bool EventCallback::eventToJava(QObject* aObj, QEvent* aEvent, const int& aSwtEventType)

    {

    if( aSwtEventType > -1 )

        {

        return doSendEvent(aObj, aSwtEventType);

        }

    int eventType = aEvent->type();

    switch ( eventType )

        {

        case QEvent::Paint:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (paint event) object=%x", eventType, aObj);

            QPaintEvent *paintEvent = static_cast<QPaintEvent*>(aEvent);

            const QRect rect = paintEvent->rect();

            const QRegion *region = &(paintEvent->region());

            return doSendEvent(aObj, eventType, rect.x(),

                rect.y(), rect.width(), rect.height(),

                reinterpret_cast<int> (region));

            }

        case QEvent::Close:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (close event) object=%x", eventType, aObj);

            return doSendEvent(aObj, eventType);

            }

        case QEvent::KeyPress: //intentional fall-through

        case QEvent::KeyRelease:

        case QEvent::ShortcutOverride:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (key event) object=%x", eventType, aObj);

            QKeyEvent *keyEvent = static_cast<QKeyEvent*>(aEvent);

            // QString ensures that the character at position size() is always '\0'

            int character = keyEvent->text()[0].unicode();

            // In cases where modifier keys (alt, ctrl etc) are involved the 

            // keyEvent->text() will return an empty string. In such cases 

            // keyEvent->key() will contain a valid value.

            if (character == 0)

                {

                character = keyEvent->key();

                }

            return doSendEvent(aObj, eventType,

                keyEvent->key(), static_cast<int> (keyEvent->modifiers()),

                character, 

// This parameter is used for handling modifier keys. On Linux use the native virtual key,

// on Symbian this returns 0 so use native scan code instead.

#ifdef __SYMBIAN32__

                keyEvent->nativeScanCode()

#else

                keyEvent->nativeVirtualKey()

#endif

                );

            }

        case QEvent::MouseButtonPress: //intentional fall-through

        case QEvent::MouseButtonRelease: //intentional fall-through

        case QEvent::MouseButtonDblClick: //intentional fall-through

        case QEvent::MouseMove:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (mouse event) object=%x", eventType, aObj);

            QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(aEvent);

            return doSendEvent(aObj, eventType,

                static_cast<int> (mouseEvent->button()), mouseEvent->x(),

                mouseEvent->y(), static_cast<int> (mouseEvent->modifiers()),

                static_cast<int> (mouseEvent->buttons()));

            }

        case QEvent::FocusIn: // Sent before gaining focus

            {

            QFocusEvent* focusEvent = static_cast<QFocusEvent*>(aEvent);

            SWT_LOG_EVENT_3("QEvent type=%d (FocusIn) reason=%d object=%x", eventType, focusEvent->reason(), aObj);

            return doSendEvent(aObj, eventType, focusEvent->reason());

            }

        case QEvent::FocusOut: // Sent before losing focus

            {

            QFocusEvent* focusEvent = static_cast<QFocusEvent*>(aEvent);

            SWT_LOG_EVENT_3("QEvent type=%d (FocusOut) reason=%d object=%x", eventType, focusEvent->reason(), aObj);

            return doSendEvent(aObj, eventType, focusEvent->reason());

            }

        case QEvent::ContextMenu:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (context menu event) object=%x", eventType, aObj);

            QContextMenuEvent* contextEvent = static_cast<QContextMenuEvent*>(aEvent);

            return doSendEvent(aObj, eventType, contextEvent->globalX(), contextEvent->globalY(), contextEvent->reason());

            }

        case QEvent::Shortcut:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (ShortcutEvent) object=%x", eventType, aObj);

            QShortcutEvent* scEvent = static_cast<QShortcutEvent*>(aEvent);

            const QKeySequence& sequence = scEvent->key();

            const int sequenceCount( sequence.count() );

            const int keyCount( 4 ); // QKeySequence supports only maximum of 4 keys

            int keys[keyCount];

            for( int i = 0; i < keyCount; ++i )

                {

                if( i < sequenceCount )

                    {

                    keys[i] = sequence[i];

                    }

                else

                    {

                    keys[i] = 0;

                    }

                }

            return doSendEvent(aObj, eventType, keys[0], keys[1], keys[2], keys[3] );

            }

        case QEvent::WindowActivate:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (WindowActivate) object=%x", eventType, aObj);

            return doSendEvent(aObj, eventType);

            }

        case QEvent::WindowDeactivate:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (WindowDeactivate) object=%x", eventType, aObj);

            return doSendEvent(aObj, eventType);

            }

        case QEvent::WindowStateChange:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (WindowStateChange) object=%x", eventType, aObj);

            QWindowStateChangeEvent* scEvent = static_cast<QWindowStateChangeEvent*>(aEvent);

            return doSendEvent(aObj, eventType, (int)(scEvent->oldState())); // QFlags implements operator int()

            }

        case QEvent::DeferredDelete:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (DeferredDelete) object=%x", eventType, aObj);

            const bool cancel = !swtApp->jniUtils().safeToDelete(aObj); 

            if(cancel)

                {

                // Repost a new event for trying again later. Note that this 

                // new event might have different internal parameters like

                // eventloop level it was posted from etc. 

                swtApp->addDeferredEvent(aObj, new QEvent(QEvent::DeferredDelete));

                }

            return cancel;

            }

        case QEvent::ApplicationFontChange:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (ApplicationFontChange) object=%x", eventType, aObj);

            return doSendEvent(aObj, eventType);

            }

        case QEvent::ApplicationLayoutDirectionChange:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (ApplicationLayoutDirectionChange) object=%x", eventType, aObj);

            return doSendEvent(aObj, eventType);

            }

        case QEvent::ApplicationPaletteChange:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (ApplicationPaletteChange) object=%x", eventType, aObj);

            return doSendEvent(aObj, eventType);

            }

        case org_eclipse_swt_internal_qt_OS_QSWTEVENT_BUFFERFLUSH:

            {

            SWT_LOG_EVENT_2("QEvent type=%d (SwtBufferFlush) object=%x", eventType, aObj);

            return doSendEvent(aObj, eventType);

            }

        default:

            {

            SWT_LOG_EVENT_2("Unknown QEvent type=%d object=%x", eventType, aObj);

            return false;

            }

        }

    }

bool EventCallback::doSendEvent(const QObject* aQObject, const int& aQEventType,

        const int& a1, const int& a2, const int& a3,

        const int& a4, const int& a5)

    {

    mEventTargetObjectAlive = const_cast<QObject*>(aQObject);

    bool cancelInFilter = mJniUtils.eventProcess (aQObject,

            aQEventType, a1, a2, a3, a4, a5); 

    if(!mEventTargetObjectAlive)

        {

        // Safety check:

        // If the object was destroyed by the listener then drop the event 

        // being processed to avoid invalid pointer access. Shouldn't ever

        // happen. 

        cancelInFilter = true;

        }

    mEventTargetObjectAlive = NULL;

    return cancelInFilter;

    }