Add a delete button to the keyboard.

Change-Id: I10e57f19a7edfb4a59fb3c2f48bc0f8a8a58643f

app/utils.cpp

@@ -153,6 +153,15 @@ char* get_text() {
       }
       // we want to be inside the parenthese if there are some.
       index -= (tmp > 2) ? 2 : 0;
+    } else if (event == DELETE) {
+      // Nothing to delete.
+      if (index == max) {
+        continue;
+      }
+      for (int i=index; i<max+1; i++) {
+        input[i] = input[i+1];
+      }
+      max--;
     }
   }
   

ion/include/ion/events.h

@@ -78,6 +78,7 @@ typedef enum {
   UP_ARROW,
   DOWN_ARROW,
   TRIG_MENU,
+  DELETE,
   ERROR = 0xffffffff,
 } ion_event_t;
 

ion/src/shared/events.c

@@ -49,7 +49,7 @@ static ion_key_event_t ion_get_key_event() {
 // For now this is a bit silly but needed for instreface purpose.
 static const ion_event_t kEventForKeyDown[ION_NUMBER_OF_KEYS] = {
   UPPER_CASE_A, UPPER_CASE_B, UPPER_CASE_C, UPPER_CASE_D, UPPER_CASE_E,
-  UPPER_CASE_F, UPPER_CASE_G, UPPER_CASE_H, UP_ARROW, DOWN_ARROW,
+  UPPER_CASE_F, UPPER_CASE_G, DELETE, UP_ARROW, DOWN_ARROW,
   UPPER_CASE_K, UPPER_CASE_L, TRIG_MENU, LEFT_ARROW, RIGHT_ARROW,
   SEVEN, EIGHT, NINE, LEFT_PARENTHESIS, RIGHT_PARENTHESIS,
   FOUR, FIVE, SIX, PRODUCT, DIVISION,

ion/src/simulator/keyboard/fltkkbd.cpp

@@ -6,7 +6,7 @@
 
 static const char* kCharForKey[KEYBOARD_ROWS * KEYBOARD_COLUMNS] = {
   "A", "B", "C", "D", "E",
-  "F", "G", "H", "UP", "DOWN",
+  "F", "G", "DEL", "UP", "DOWN",
   "K", "L", "TRIG", "LEFT", "RIGHT",
   "7", "8", "9", "(", ")",
   "4", "5", "6", "*", "/",