Added a new base class RSTextEdit with placeholder for Qt < 5.2

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7792 b45a01b8-16f6-495d-af2f-9b41ad6348cc

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

@@ -0,0 +1,50 @@
+/****************************************************************
+ *
+ *  RetroShare is distributed under the following license:
+ *
+ *  Copyright (C) 2014, 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 RSTEXTEDIT_H
+#define RSTEXTEDIT_H
+
+#include <QTextEdit>
+
+class RSTextEdit : public QTextEdit
+{
+	Q_OBJECT
+
+public:
+	RSTextEdit(QWidget *parent = 0);
+
+#if QT_VERSION < 0x050200
+	void setPlaceholderText(const QString &text);
+#endif
+
+protected:
+#if QT_VERSION < 0x050200
+	virtual void paintEvent(QPaintEvent *event);
+#endif
+
+private:
+#if QT_VERSION < 0x050200
+	QString mPlaceholderText;
+#endif
+};
+
+#endif // RSTEXTEDIT_H