QML Debugger refactoring

Now, QmlEngine creates the connection to the inferior (debuggee), and
notifies QmlInspector when a connection is established. Before,
inspector created the debugger engin, which was wrong.

QmlEngine's responsibilities are connecting to the debuggee and basic
QML/JS debugging features like locals & watchers, breakpoints etc.
QmlInspector takes care of Live Preview and other fancy inspection
features.

Reviewed-by: hjk

src/plugins/debugger/qml/qmladapter.h

@@ -0,0 +1,98 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#ifndef QMLADAPTER_H
+#define QMLADAPTER_H
+
+#include <QObject>
+#include <QWeakPointer>
+
+#include "qmljsprivateapi.h"
+#include "debugger_global.h"
+
+QT_FORWARD_DECLARE_CLASS(QTimer)
+
+namespace Debugger {
+namespace Internal {
+class DebuggerEngine;
+class QmlDebuggerClient;
+
+class DEBUGGER_EXPORT QmlAdapter : public QObject
+{
+    Q_OBJECT
+public:
+    explicit QmlAdapter(DebuggerEngine *engine, QObject *parent = 0);
+    void beginConnection();
+
+    bool isConnected() const;
+    bool isUnconnected() const;
+
+    QDeclarativeEngineDebug *client() const;
+    QDeclarativeDebugConnection *connection() const;
+
+    // TODO move to private API b/w engine and adapter
+    void setMaxConnectionAttempts(int maxAttempts);
+    void setConnectionAttemptInterval(int interval);
+
+signals:
+    void aboutToDisconnect();
+    void connected();
+    void disconnected();
+    void connectionStartupFailed();
+    void connectionError();
+
+private slots:
+    void connectionErrorOccurred();
+    void connectionStateChanged();
+    void pollInferior();
+
+private:
+    bool connectToViewer();
+    void createDebuggerClient();
+    void showConnectionStatusMessage(const QString &message);
+    void showConnectionErrorMessage(const QString &message);
+
+private:
+    QWeakPointer<DebuggerEngine> m_engine;
+    QmlDebuggerClient *m_qmlClient;
+    QDeclarativeEngineDebug *m_mainClient;
+
+    QTimer *m_connectionTimer;
+    int m_connectionAttempts;
+    int m_maxConnectionAttempts;
+    int m_connectionAttemptInterval;
+
+    QDeclarativeDebugConnection *m_conn;
+
+};
+
+} // namespace Internal
+} // namespace Debugger
+
+#endif // QMLADAPTER_H