--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/scripttools/debugging/qscriptdebuggerfrontend.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,235 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtSCriptTools module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** 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
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** 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
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qscriptdebuggerfrontend_p.h"
+#include "qscriptdebuggerfrontend_p_p.h"
+#include "qscriptdebuggercommand_p.h"
+#include "qscriptdebuggerevent_p.h"
+#include "qscriptdebuggerresponse_p.h"
+#include "qscriptdebuggereventhandlerinterface_p.h"
+#include "qscriptdebuggerresponsehandlerinterface_p.h"
+
+#include <QtCore/qcoreevent.h>
+#include <QtCore/qcoreapplication.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+  \class QScriptDebuggerFrontend
+  \since 4.5
+  \internal
+
+  \brief The QScriptDebuggerFrontend class is the base class of debugger front-ends.
+*/
+
+// helper class that's used to handle our custom Qt events
+class QScriptDebuggerFrontendEventReceiver : public QObject
+{
+public:
+    QScriptDebuggerFrontendEventReceiver(QScriptDebuggerFrontendPrivate *frontend,
+                                         QObject *parent = 0);
+    ~QScriptDebuggerFrontendEventReceiver();
+
+    bool event(QEvent *);
+
+private:
+    QScriptDebuggerFrontendPrivate *m_frontend;
+};
+
+QScriptDebuggerFrontendEventReceiver::QScriptDebuggerFrontendEventReceiver(
+    QScriptDebuggerFrontendPrivate *frontend, QObject *parent)
+    : QObject(parent), m_frontend(frontend)
+{
+}
+    
+QScriptDebuggerFrontendEventReceiver::~QScriptDebuggerFrontendEventReceiver()
+{
+}
+
+bool QScriptDebuggerFrontendEventReceiver::event(QEvent *e)
+{
+    return m_frontend->event(e);
+}
+
+
+QScriptDebuggerFrontendPrivate::QScriptDebuggerFrontendPrivate()
+{
+    eventHandler = 0;
+    nextCommandId = 0;
+    eventReceiver = new QScriptDebuggerFrontendEventReceiver(this);
+}
+
+QScriptDebuggerFrontendPrivate::~QScriptDebuggerFrontendPrivate()
+{
+    delete eventReceiver;
+}
+
+void QScriptDebuggerFrontendPrivate::postEvent(QEvent *e)
+{
+    QCoreApplication::postEvent(eventReceiver, e);
+}
+
+bool QScriptDebuggerFrontendPrivate::event(QEvent *e)
+{
+    Q_Q(QScriptDebuggerFrontend);
+    if (e->type() == QEvent::User+1) {
+        QScriptDebuggerEventEvent *de = static_cast<QScriptDebuggerEventEvent*>(e);
+        bool handled = q->notifyEvent(de->event());
+        if (handled) {
+            q->scheduleCommand(QScriptDebuggerCommand::resumeCommand(),
+                               /*responseHandler=*/0);
+        }
+        return true;
+    } else if (e->type() == QEvent::User+2) {
+        processCommands();
+        return true;
+    }
+    return false;
+}
+
+void QScriptDebuggerFrontendPrivate::processCommands()
+{
+    Q_Q(QScriptDebuggerFrontend);
+    while (!pendingCommands.isEmpty()) {
+        QScriptDebuggerCommand command(pendingCommands.takeFirst());
+        int id = pendingCommandIds.takeFirst();
+        q->processCommand(id, command);
+    }
+}
+
+QScriptDebuggerFrontend::QScriptDebuggerFrontend()
+    : d_ptr(new QScriptDebuggerFrontendPrivate())
+{
+    d_ptr->q_ptr = this;
+}
+
+QScriptDebuggerFrontend::~QScriptDebuggerFrontend()
+{
+}
+
+QScriptDebuggerFrontend::QScriptDebuggerFrontend(QScriptDebuggerFrontendPrivate &dd)
+    : d_ptr(&dd)
+{
+    d_ptr->q_ptr = this;
+}
+
+QScriptDebuggerEventHandlerInterface *QScriptDebuggerFrontend::eventHandler() const
+{
+    Q_D(const QScriptDebuggerFrontend);
+    return d->eventHandler;
+}
+
+void QScriptDebuggerFrontend::setEventHandler(QScriptDebuggerEventHandlerInterface *eventHandler)
+{
+    Q_D(QScriptDebuggerFrontend);
+    d->eventHandler = eventHandler;
+}
+
+/*!
+  Schedules the given \a command for execution by this front-end,
+  and returns a unique identifier associated with this command.
+
+  Subclasses can call this function to schedule custom commands.
+
+  \sa notifyCommandFinished()
+*/
+int QScriptDebuggerFrontend::scheduleCommand(
+    const QScriptDebuggerCommand &command,
+    QScriptDebuggerResponseHandlerInterface *responseHandler)
+{
+    Q_D(QScriptDebuggerFrontend);
+    int id = ++d->nextCommandId;
+    d->pendingCommands.append(command);
+    d->pendingCommandIds.append(id);
+    if (responseHandler)
+        d->responseHandlers.insert(id, responseHandler);
+    if (d->pendingCommands.size() == 1) {
+        QEvent *e = new QEvent(QEvent::Type(QEvent::User+2)); // ProcessCommands
+        d->postEvent(e);
+    }
+    return id;
+}
+
+/*!
+  Subclasses should call this function when the command identified by
+  the given \a id has finished and produced the given \a response.
+
+  \sa processCommand(), notifyEvent()
+*/
+void QScriptDebuggerFrontend::notifyCommandFinished(int id, const QScriptDebuggerResponse &response)
+{
+    Q_D(QScriptDebuggerFrontend);
+    if (d->responseHandlers.contains(id)) {
+        QScriptDebuggerResponseHandlerInterface *handler = d->responseHandlers.take(id);
+        Q_ASSERT(handler != 0);
+        handler->handleResponse(response, id);
+    }
+}
+
+/*!
+  Subclasses should call this function when the given \a event is
+  received from the back-end.
+
+  \sa notifyCommandFinished(), QScriptDebuggerBackend::event()
+*/
+bool QScriptDebuggerFrontend::notifyEvent(const QScriptDebuggerEvent &event)
+{
+    Q_D(QScriptDebuggerFrontend);
+    if (d->eventHandler)
+        return d->eventHandler->debuggerEvent(event);
+    return false;
+}
+
+int QScriptDebuggerFrontend::scheduledCommandCount() const
+{
+    Q_D(const QScriptDebuggerFrontend);
+    return d->nextCommandId;
+}
+
+/*!
+  \fn void QScriptDebuggerFrontend::processCommand(int id, const QScriptDebuggerCommand &command)
+
+  Subclasses must reimplement this function to process the given \a command
+  identified by \a id. Call notifyCommandFinished() when processing is
+  complete.
+*/
+
+QT_END_NAMESPACE