[escher] Create a clipped board

Change-Id: I994175d902bce2c326149e1b08ebb7c1a60581a2

escher/Makefile

@@ -7,6 +7,7 @@ objs += $(addprefix escher/src/,\
   button.o\
   button_row_controller.o\
   chevron_view.o\
+  clipped_board.o\
   container.o\
   dynamic_view_controller.o\
   editable_text_cell.o\

escher/include/escher.h

@@ -8,6 +8,7 @@
 #include <escher/button.h>
 #include <escher/button_row_controller.h>
 #include <escher/chevron_view.h>
+#include <escher/clipped_board.h>
 #include <escher/container.h>
 #include <escher/dynamic_view_controller.h>
 #include <escher/editable_text_cell.h>

escher/include/escher/clipped_board.h

@@ -0,0 +1,17 @@
+#ifndef ESCHER_CLIPPED_BOARD_H
+#define ESCHER_CLIPPED_BOARD_H
+
+#include <escher/text_field.h>
+
+class ClippedBoard {
+public:
+  ClippedBoard();
+  static ClippedBoard * sharedClippedBoard();
+  void store(const char * storedText);
+  const char * storedText();
+  void reset();
+private:
+  char m_textBuffer[TextField::maxBufferSize()];
+};
+
+#endif

escher/src/clipped_board.cpp

@@ -0,0 +1,23 @@
+#include <escher/clipped_board.h>
+
+static ClippedBoard s_clippedBoard;
+
+ClippedBoard::ClippedBoard()
+{
+}
+
+ClippedBoard * ClippedBoard::sharedClippedBoard() {
+  return &s_clippedBoard;
+}
+
+void ClippedBoard::store(const char * storedText) {
+  strlcpy(m_textBuffer, storedText, TextField::maxBufferSize());
+}
+
+const char * ClippedBoard::storedText() {
+  return m_textBuffer;
+}
+
+void ClippedBoard::reset() {
+  strlcpy(m_textBuffer, "", 1);
+}