Improve TaskList plugin

* Automatically reload task lists.
 * Add task handler to stop the reloading
 * Add some really simple API for other plugins to use.

src/plugins/tasklist/taskfile.h

@@ -0,0 +1,76 @@
+/**************************************************************************
+**
+** 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 TASKFILE_H
+#define TASKFILE_H
+
+#include <coreplugin/ifile.h>
+
+namespace ProjectExplorer {
+class Project;
+} // namespace ProjectExplorer
+
+namespace TaskList {
+namespace Internal {
+
+class TaskFile : public Core::IFile
+{
+public:
+    TaskFile(QObject *parent);
+    ~TaskFile();
+
+    bool save(const QString &fileName = QString());
+    QString fileName() const;
+
+    QString defaultPath() const;
+    QString suggestedFileName() const;
+    QString mimeType() const;
+
+    bool isModified() const;
+    bool isReadOnly() const;
+    bool isSaveAsAllowed() const;
+
+    ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
+    void reload(ReloadFlag flag, ChangeType type);
+    void rename(const QString &newName);
+
+    bool open(const QString &fileName);
+
+    ProjectExplorer::Project *context() const;
+    void setContext(ProjectExplorer::Project *context);
+
+private:
+    QString m_fileName;
+    ProjectExplorer::Project *m_context;
+};
+
+} // namespace Internal
+} // namespace TaskList
+
+#endif // TASKFILE_H