diff --git a/sources/appl/Buffer/Buffer.cpp b/sources/appl/Buffer/Buffer.cpp
index 4b74bb6..8d3cfbf 100644
--- a/sources/appl/Buffer/Buffer.cpp
+++ b/sources/appl/Buffer/Buffer.cpp
@@ -31,12 +31,168 @@ bool appl::Buffer::LoadFile(const etk::UString& _name)
 }
 
 
+
 void appl::Buffer::SetFileName(const etk::UString& _name)
 {
 	// TODO : ...
 }
 
-bool appl::Buffer::OnEventEntry(const ewol::EventEntry& _event)
+
+void appl::Buffer::MoveCursorRight(appl::Buffer::moveMode _mode)
+{
+	etk::UniChar value;
+	esize_t nbElement;
+	switch (_mode) {
+		default:
+		case moveLetter:
+			nbElement = Get(m_cursorPos, value);
+			if (nbElement>0) {
+				m_cursorPos += nbElement;
+			}
+			break;
+		case moveWord:
+			// TODO : ...
+			break;
+		case moveEnd:
+			// TODO : ...
+			break;
+	}
+	
+}
+
+void appl::Buffer::MoveCursorLeft(appl::Buffer::moveMode _mode)
+{
+	etk::UniChar value;
+	esize_t nbElement;
+	switch (_mode) {
+		default:
+		case moveLetter:
+			nbElement = GetBack(m_cursorPos-1, value);
+			if (nbElement>0) {
+				m_cursorPos -= nbElement;
+			}
+			break;
+		case moveWord:
+			// TODO : ...
+			break;
+		case moveEnd:
+			// TODO : ...
+			break;
+	}
+}
+
+void appl::Buffer::MoveCursorUp(esize_t _nbLine)
+{
+	/*
+	// Find the position of the start of the line.
+	esize_t lineStartPos = m_EdnBuf.StartOfLine(m_cursorPos);
+	// check if we can go up ...
+	if (lineStartPos == 0) {
+		return;
+	}
+	// Decide what column to move to, if there's a preferred column use that
+	int32_t column = m_cursorPreferredCol;
+	if (m_cursorPreferredCol < 0) {
+		column = m_EdnBuf.CountDispChars(lineStartPos, m_cursorPos);
+	}
+	// Get the previous line
+	esize_t prevLineStartPos = m_EdnBuf.CountBackwardNLines(lineStartPos, _nbLine);
+	//APPL_INFO("Move Line UP result : prevLineStartPos=" << prevLineStartPos);
+	// Get the display char position
+	esize_t newPos = m_EdnBuf.CountForwardDispChars(prevLineStartPos, column);
+	//APPL_INFO("Move to colomn : column=" << column << " newPos=" << newPos);
+	// move the cursor
+	SetInsertPosition(newPos);
+	// if a preferred column wasn't aleady established, establish it
+	if (m_cursorPreferredCol < 0) {
+		m_cursorPreferredCol = column;
+	}
+	return;
+	*/
+}
+
+void appl::Buffer::MoveCursorDown(esize_t _nbLine)
+{
+	/*
+	// check if we are not at the end of Buffer
+	if (m_cursorPos == m_EdnBuf.Size() ) {
+		return;
+	}
+	// Find the position of the start of the line.
+	esize_t lineStartPos = m_EdnBuf.StartOfLine(m_cursorPos);
+	
+	int32_t column = m_cursorPreferredCol;
+	if (m_cursorPreferredCol < 0) {
+		column = m_EdnBuf.CountDispChars(lineStartPos, m_cursorPos);
+	}
+	// get the next line :
+	esize_t nextLineStartPos = m_EdnBuf.CountForwardNLines(lineStartPos, _nbLine);
+	//APPL_INFO("Move Line DOWN result : nextLineStartPos=" << nextLineStartPos);
+	// Get the display char position
+	esize_t newPos = m_EdnBuf.CountForwardDispChars(nextLineStartPos, column);
+	//APPL_INFO("Move to colomn : column=" << column << " newPos=" << newPos);
+	
+	SetInsertPosition(newPos);
+	// if a preferred column wasn't aleady established, establish it
+	if (m_cursorPreferredCol < 0) {
+		m_cursorPreferredCol = column;
+	}
+	return;
+	*/
+}
+
+esize_t appl::Buffer::StartLine(esize_t _pos)
+{
+	esize_t startPos;
+	if (false == SearchBackward(pos, etk::UniChar::Return, &startPos)) {
+		return 0;
+	}
+	return startPos + 1;
+}
+
+esize_t appl::Buffer::EndLine(esize_t _pos)
+{
+	esize_t endPos;
+	if (false == SearchForward(pos, etk::UniChar::Return, &endPos)) {
+		endPos = m_data.Size();
+	}
+	return endPos;
+}
+
+bool appl::Buffer::SearchForward(esize_t _pos, const etk::UniChar& _search, esize_t& _result)
+{
+	// move in the string
+	esize_t nbElementBuffer = 0;
+	etk::UniChar value;
+	for(esize_t iii=_pos ; iii<m_data.Size() ; iii+=nbElementBuffer ) {
+		nbElementBuffer = GetBack(iii, value);
+		if (value == _search) {
+			_result = iii;
+			return true;
+		}
+	}
+	_result = m_data.Size();
+	return false;
+}
+
+bool appl::Buffer::SearchBack(esize_t _pos, const etk::UniChar& _search, esize_t& _result)
+{
+	// move in the string
+	esize_t nbElementBuffer = 0;
+	etk::UniChar value;
+	for(esize_t iii=_pos-1 ; iii>=0 ; iii-=nbElementBuffer ) {
+		nbElementBuffer = GetBack(iii, value);
+		if (value == _search) {
+			_result = iii-nbElementBuffer;
+			return true;
+		}
+	}
+	_result = 0;
+	return false;
+}
+
+
+bool appl::Buffer::OnEventEntry(const ewol::EventEntry& _event) // TODO : , vec2 _displaySize)
 {
 	APPL_DEBUG(" event : " << _event);
 	if (_event.GetType() == ewol::keyEvent::keyboardChar) {
@@ -51,26 +207,74 @@ bool appl::Buffer::OnEventEntry(const ewol::EventEntry& _event)
 			m_data.Insert(m_cursorPos, '\n');
 			m_cursorPos += 1;
 		} else if (_event.GetChar() == etk::UniChar::Suppress ) {
-			APPL_INFO("keyEvent : <suppr>	pos=" << m_cursorPos);
+			//APPL_INFO("keyEvent : <suppr> pos=" << m_cursorPos);
+			etk::UniChar value;
+			esize_t nbElement = Get(m_cursorPos, value);
+			if (nbElement>0) {
+				m_data.Remove(m_cursorPos, nbElement);
+			}
 		} else if (_event.GetChar() == etk::UniChar::Delete) {
-			APPL_INFO("keyEvent : <del>	pos=" << m_cursorPos);
+			//APPL_INFO("keyEvent : <del> pos=" << m_cursorPos);
+			etk::UniChar value;
+			esize_t nbElement = GetBack(m_cursorPos-1, value);
+			if (nbElement>0) {
+				m_cursorPos -= nbElement;
+				m_data.Remove(m_cursorPos, nbElement);
+			}
 		} else {
 			// normal adding char ...
 			char output[5];
 			int32_t nbElement = _event.GetChar().GetUtf8(output);
-			etk::Vector<int8_t> values;
-			for (int32_t iii=0; iii<nbElement; ++iii) {
-				values.PushBack(output[iii]);
-			}
-			m_data.Insert(m_cursorPos, values);
+			m_data.Insert(m_cursorPos, (int8_t*)output, nbElement);
 			m_cursorPos += nbElement;
 		}
 		return true;
 	}
 	// move events ...
 	if (_event.GetStatus() == ewol::keyEvent::statusDown) {
-		//m_buffer->CursorMove(_event.GetType());
-		
+		bool needUpdatePosition = true;
+		// check selection event ...
+		switch(_event.GetType()) {
+			case ewol::keyEvent::keyboardLeft:
+				//APPL_INFO("keyEvent : <LEFT>");
+				MoveCursorLeft();
+				break;
+			case ewol::keyEvent::keyboardRight:
+				//APPL_INFO("keyEvent : <RIGHT>");
+				MoveCursorRight();
+				break;
+			case ewol::keyEvent::keyboardUp:
+				//APPL_INFO("keyEvent : <UP>");
+				MoveCursorUp(1);
+				break;
+			case ewol::keyEvent::keyboardDown:
+				//APPL_INFO("keyEvent : <DOWN>");
+				MoveCursorDown(1);
+				break;
+			case ewol::keyEvent::keyboardPageUp:
+				//APPL_INFO("keyEvent : <PAGE-UP>");
+				//TextDMoveUp(m_displaySize.y());
+				break;
+			case ewol::keyEvent::keyboardPageDown:
+				//APPL_INFO("keyEvent : <PAGE-DOWN>");
+				//TextDMoveDown(m_displaySize.y());
+				break;
+			case ewol::keyEvent::keyboardStart:
+				//APPL_INFO("keyEvent : <Start of line>");
+				MoveCursorLeft(moveEnd);
+				break;
+			case ewol::keyEvent::keyboardEnd:
+				//APPL_INFO("keyEvent : <End of line>");
+				MoveCursorRight(moveEnd);
+				break;
+			default:
+				break;
+		}
+		/*
+		if ( true == needUpdatePosition) {
+			RequestUpdateOfThePosition();
+		}
+		*/
 		return true;
 	}
 	return false;
@@ -80,13 +284,17 @@ bool appl::Buffer::OnEventEntry(const ewol::EventEntry& _event)
 esize_t appl::Buffer::Get(esize_t _pos, etk::UniChar& _value, unicode::charset_te _charset) const
 {
 	_value = '\0';
+	if (_pos<0 && _pos<m_data.Size()) {
+		return 0;
+	}
 	if (_charset == unicode::EDN_CHARSET_UTF8) {
 		char tmpVal[5];
+		memset(tmpVal, 0, sizeof(tmpVal));
 		tmpVal[0] = m_data[_pos];
-		tmpVal[1] = m_data[_pos+1];
-		tmpVal[2] = m_data[_pos+2];
-		tmpVal[3] = m_data[_pos+3];
-		tmpVal[4] = '\0';
+		int8_t nbChar = etk::UniChar::TheoricUTF8Len(tmpVal[0]);
+		for (int32_t iii=1; iii<nbChar && _pos+iii<m_data.Size(); ++iii) {
+			tmpVal[iii] = m_data[_pos+iii];
+		}
 		// transform ...
 		int32_t nbElement = _value.SetUtf8(tmpVal);
 		return nbElement;
@@ -95,3 +303,33 @@ esize_t appl::Buffer::Get(esize_t _pos, etk::UniChar& _value, unicode::charset_t
 	_value.Set(m_data[_pos]);
 	return 1;
 }
+
+esize_t appl::Buffer::GetBack(esize_t _pos, etk::UniChar& _value, unicode::charset_te _charset) const
+{
+	_value = '\0';
+	if (_pos<0 && _pos<m_data.Size()) {
+		return 0;
+	}
+	if (_charset == unicode::EDN_CHARSET_UTF8) {
+		char tmpVal[5];
+		char* pointerVal = &tmpVal[4];
+		memset(tmpVal, 0, sizeof(tmpVal));
+		*pointerVal = m_data[_pos];
+		int32_t iii=0;
+		while(    etk::UniChar::TheoricUTF8First(*pointerVal) == false
+		       && pointerVal > tmpVal
+		       && _pos-iii>0) {
+			--pointerVal;
+			++iii;
+			*pointerVal = m_data[_pos - iii];
+		};
+		int32_t nbElement = _value.SetUtf8(pointerVal);
+		return nbElement;
+	}
+	_value.Set(m_data[_pos]);
+	return 1;
+	
+}
+
+
+
diff --git a/sources/appl/Buffer/Buffer.h b/sources/appl/Buffer/Buffer.h
index 557fe18..a67d25f 100644
--- a/sources/appl/Buffer/Buffer.h
+++ b/sources/appl/Buffer/Buffer.h
@@ -53,7 +53,70 @@ namespace appl
 			 * @param[in] _charset Charset used to parse the current buffer
 			 * @return number ofelement read in the buffer (to increment the position)
 			 */
-			esize_t Get(esize_t _pos, etk::UniChar& _value, unicode::charset_te _charset) const;
+			esize_t Get(esize_t _pos, etk::UniChar& _value, unicode::charset_te _charset = unicode::EDN_CHARSET_UTF8) const;
+			/**
+			 * @brief Get the previous element in the buffer.
+			 * @param[in] _pos Position in the buffer (last element of the element)
+			 * @param[out] _value Unicode value read in the buffer
+			 * @param[in] _charset Charset used to parse the current buffer
+			 * @return number of element read in the buffer (to increment the position)
+			 */
+			esize_t GetBack(esize_t _pos, etk::UniChar& _value, unicode::charset_te _charset = unicode::EDN_CHARSET_UTF8) const;
+		private:
+			enum moveMode {
+				moveLetter,
+				moveWord,
+				moveEnd
+			}
+			/**
+			 * Move the cursor right in the line (no stop of a new line)
+			 * @param[in] _mode Moving mode char, word, ...
+			 */
+			void MoveCursorRight(moveMode _mode = moveLetter);
+			/**
+			 * Move the cursor left in the line (no stop of a new line)
+			 * @param[in] _mode Moving mode char, word, ...
+			 */
+			void MoveCursorLeft(moveMode _mode = moveLetter);
+			/**
+			 * @brief Move the cursor at an other position upper.
+			 * @param[in] _nbLine number of up line that might be moved
+			 */
+			void MoveCursorUp(esize_t _nbLine);
+			/**
+			 * @brief Move the cursor at an other position under.
+			 * @param[in] _nbLine number of down line that might be moved
+			 */
+			void MoveCursorDown(esize_t _nbLine);
+			/**
+			 * @brief Get the start of a line with the position in the buffer.
+			 * @param[in] _pos position in the buffer.
+			 * @return The position in the buffer of the start of the line.
+			 */
+			esize_t StartLine(esize_t _pos);
+			/**
+			 * @brief Get the end of a line with the position in the buffer.
+			 * @param[in] _pos position in the buffer.
+			 * @return The position in the buffer of the end of the line.
+			 */
+			esize_t EndLine(esize_t _pos);
+			/**
+			 * @brief Search a character in the buffer.
+			 * @param[in] _pos Position to start the search of the element.
+			 * @param[in] _search Character to search.
+			 * @param[out] _result Research position.
+			 * @return true if pos if fined.
+			 */
+			bool SearchForward(esize_t _pos, const etk::UniChar& _search, esize_t& _result);
+			/**
+			 * @brief Search a character in the buffer in back mode.
+			 * @param[in] _pos Position to start the search of the element.
+			 * @param[in] _search Character to search.
+			 * @param[out] _result Research position.
+			 * @return true if pos if fined.
+			 */
+			bool SearchBack(esize_t _pos, const etk::UniChar& _search, esize_t& _result);
+
 	};
 };
 
diff --git a/sources/appl/Gui/TextViewer.cpp b/sources/appl/Gui/TextViewer.cpp
index c8489ff..2f7108c 100644
--- a/sources/appl/Gui/TextViewer.cpp
+++ b/sources/appl/Gui/TextViewer.cpp
@@ -240,6 +240,7 @@ bool appl::TextViewer::OnEventEntry(const ewol::EventEntry& _event)
 	if (m_buffer == NULL) {
 		return false;
 	}
+	// just forward event ==> manage directly in the buffer
 	if (m_buffer->OnEventEntry(_event) == true) {
 		MarkToRedraw();
 		return true;