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/stopmonitoringhandler.cpp

@@ -0,0 +1,69 @@
+/**************************************************************************
+**
+** 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.
+**
+**************************************************************************/
+
+#include "stopmonitoringhandler.h"
+
+#include "tasklistconstants.h"
+#include "tasklistplugin.h"
+
+#include <projectexplorer/task.h>
+
+#include <QtGui/QAction>
+
+using namespace TaskList;
+using namespace TaskList::Internal;
+
+// --------------------------------------------------------------------------
+// StopMonitoringHandler
+// --------------------------------------------------------------------------
+
+StopMonitoringHandler::StopMonitoringHandler() :
+    ProjectExplorer::ITaskHandler(QLatin1String("TaskList.StopMonitoringHandler"))
+{ }
+
+StopMonitoringHandler::~StopMonitoringHandler()
+{ }
+
+bool StopMonitoringHandler::canHandle(const ProjectExplorer::Task &task)
+{
+    return task.category == QLatin1String(Constants::TASKLISTTASK_ID);
+}
+
+void StopMonitoringHandler::handle(const ProjectExplorer::Task &task)
+{
+    Q_ASSERT(canHandle(task));
+    TaskList::TaskListPlugin::instance()->stopMonitoring();
+}
+
+QAction *StopMonitoringHandler::createAction(QObject *parent)
+{
+    QAction *stopMonitoringAction = new QAction(tr("Stop monitoring"), parent);
+    stopMonitoringAction->setToolTip(tr("Stop monitoring task files."));
+    return stopMonitoringAction;
+}