Moved help browser from MainPage to a new base class named FloatingHelpBrowser for global usage.

Added FloatingHelpBrowser to the option window (help text not including).
The help text can be specified for the ConfigPages in the method "helpText".

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6818 b45a01b8-16f6-495d-af2f-9b41ad6348cc

retroshare-gui/src/gui/common/FloatingHelpBrowser.h

@@ -0,0 +1,57 @@
+/****************************************************************
+ * This file is distributed under the following license:
+ *
+ * Copyright (c) 2013, RetroShare Team
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, 
+ *  Boston, MA  02110-1301, USA.
+ ****************************************************************/ 
+ 
+#ifndef FLOATINGHELPBROWSER_H
+#define FLOATINGHELPBROWSER_H
+
+#include <QTextBrowser>
+
+class QAbstractButton;
+
+class FloatingHelpBrowser : public QTextBrowser
+{
+	Q_OBJECT
+
+public:
+	explicit FloatingHelpBrowser(QWidget *parent, QAbstractButton *button);
+
+	void setHelpText(const QString &helpText);
+
+public slots:
+	void showHelp(bool state);
+
+private slots:
+	void textChanged();
+
+protected:
+	virtual void showEvent(QShowEvent *event);
+	virtual void hideEvent(QHideEvent *event);
+	virtual void mousePressEvent(QMouseEvent *event);
+
+protected:
+	using QTextBrowser::setHtml;
+	using QTextBrowser::setText;
+
+private:
+	QAbstractButton *mButton;
+};
+
+#endif // FLOATINGHELPBROWSER_H