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/chat/ChatWidget.ui

@@ -492,6 +492,9 @@ border-image: url(:/images/closepressed.png)
            <height>30</height>
           </size>
          </property>
+         <property name="placeholderText">
+          <string>Type a message here</string>
+         </property>
         </widget>
        </item>
       </layout>

retroshare-gui/src/gui/common/MimeTextEdit.cpp

@@ -34,7 +34,7 @@
 #include <retroshare/rspeers.h>
 
 MimeTextEdit::MimeTextEdit(QWidget *parent)
-	: QTextEdit(parent), mCompleter(0)
+    : RSTextEdit(parent), mCompleter(0)
 {
 	mCompleterKeyModifiers = Qt::ControlModifier;
 	mCompleterKey = Qt::Key_Space;
@@ -52,7 +52,7 @@ bool MimeTextEdit::canInsertFromMimeData(const QMimeData* source) const
 	}
 #endif
 
-	return QTextEdit::canInsertFromMimeData(source);
+	return RSTextEdit::canInsertFromMimeData(source);
 }
 
 void MimeTextEdit::insertFromMimeData(const QMimeData* source)
@@ -75,7 +75,7 @@ void MimeTextEdit::insertFromMimeData(const QMimeData* source)
 	}
 #endif
 
-	return QTextEdit::insertFromMimeData(source);
+	return RSTextEdit::insertFromMimeData(source);
 }
 
 void MimeTextEdit::setCompleter(QCompleter *completer)
@@ -126,7 +126,7 @@ void MimeTextEdit::focusInEvent(QFocusEvent *e)
 	if (mCompleter)
 		mCompleter->setWidget(this);
 
-	QTextEdit::focusInEvent(e);
+	RSTextEdit::focusInEvent(e);
 }
 
 void MimeTextEdit::keyPressEvent(QKeyEvent *e)
@@ -154,7 +154,7 @@ void MimeTextEdit::keyPressEvent(QKeyEvent *e)
 	}
 	isShortcut |= mForceCompleterShowNextKeyEvent;
 	if (!mCompleter || !isShortcut) // do not process the shortcut when we have a completer
-		QTextEdit::keyPressEvent(e);
+		RSTextEdit::keyPressEvent(e);
 
 	if (!mCompleter) return; //Nothing else to do if not mCompleter initialized
 
@@ -181,7 +181,7 @@ void MimeTextEdit::keyPressEvent(QKeyEvent *e)
 	mCompleter->complete(cr); // popup it up!
 
 	if (mCompleter->completionCount()==0 && isShortcut){
-		QTextEdit::keyPressEvent(e);// Process the key if no match
+		RSTextEdit::keyPressEvent(e);// Process the key if no match
 	}
 	mForceCompleterShowNextKeyEvent = false;
 }

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

@@ -22,10 +22,10 @@
 #ifndef MIMETEXTEDIT_H
 #define MIMETEXTEDIT_H
 
-#include <QTextEdit>
 #include <QCompleter>
+#include "RSTextEdit.h"
 
-class MimeTextEdit : public QTextEdit
+class MimeTextEdit : public RSTextEdit
 {
 	Q_OBJECT
 

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

@@ -0,0 +1,57 @@
+/****************************************************************
+ *
+ *  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.
+ ****************************************************************/
+
+#include <QPainter>
+
+#include "RSTextEdit.h"
+
+RSTextEdit::RSTextEdit(QWidget *parent)
+    : QTextEdit(parent)
+{
+}
+
+#if QT_VERSION < 0x050200
+void RSTextEdit::setPlaceholderText(const QString &text)
+{
+	mPlaceholderText = text;
+	viewport()->repaint();
+}
+
+void RSTextEdit::paintEvent(QPaintEvent *event)
+{
+	QTextEdit::paintEvent(event);
+
+	if (!mPlaceholderText.isEmpty() && document()->isEmpty()) {
+		QWidget *vieportWidget = viewport();
+		QPainter painter(vieportWidget);
+
+		QPen pen = painter.pen();
+		QColor color = pen.color();
+		color.setAlpha(128);
+		pen.setColor(color);
+		painter.setPen(pen);
+
+		const int margin = int(document()->documentMargin());
+		painter.drawText(viewport()->rect().adjusted(margin, margin, -margin, -margin), Qt::AlignTop | Qt::TextWordWrap, mPlaceholderText);
+	}
+}
+#endif

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

retroshare-gui/src/lang/retroshare_en.ts

@@ -1497,6 +1497,10 @@ Double click lobbies to enter and chat.</source>
         <source>Search Box</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <source>Type a message here</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>CircleWidget</name>

retroshare-gui/src/retroshare-gui.pro

@@ -450,6 +450,7 @@ HEADERS +=  rshare.h \
             gui/common/GroupDefs.h \
             gui/common/Emoticons.h \
             gui/common/RSListWidgetItem.h \
+            gui/common/RSTextEdit.h \
             gui/common/RSPlainTextEdit.h \
             gui/common/RSTreeWidget.h \
             gui/common/RSTreeWidgetItem.h \
@@ -749,6 +750,7 @@ SOURCES +=  main.cpp \
             gui/common/GroupDefs.cpp \
             gui/common/Emoticons.cpp \
             gui/common/RSListWidgetItem.cpp \
+            gui/common/RSTextEdit.cpp \
             gui/common/RSPlainTextEdit.cpp \
             gui/common/RSTreeWidget.cpp \
             gui/common/RSTreeWidgetItem.cpp \