[retro-gtk] keyboard-key: Add key_to_val_converter()

[Adrien Plazas <aplazas src gnome org>]

commit 2f46c815827462011d7dd2eb4aee9587c55ed316
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Wed Nov 14 19:12:29 2018 +0500

    keyboard-key: Add key_to_val_converter()
    
    Add a function that allows to convert RetroKeyboardKey to GDK keyval,
    effectively an inverse of retro_keyboard_key_converter()

 retro-gtk/retro-keyboard-key.c | 137 +++++++++++++++++++++++++++++++++++++++++
 retro-gtk/retro-keyboard-key.h |   1 +
 2 files changed, 138 insertions(+)
---
diff --git a/retro-gtk/retro-keyboard-key.c b/retro-gtk/retro-keyboard-key.c
index e43056b..d78c936 100644
--- a/retro-gtk/retro-keyboard-key.c
+++ b/retro-gtk/retro-keyboard-key.c
@@ -166,3 +166,140 @@ retro_keyboard_key_converter (guint keyval)
     return RETRO_KEYBOARD_KEY_UNKNOWN;
   }
 }
+
+guint
+retro_keyboard_key_to_val_converter (RetroKeyboardKey key)
+{
+  /*
+   * US-ASCII codes
+   *
+   * Both GDK_KEY_* and RETRO_KEYBOARD_KEY_* start with the US-ASCII codes,
+   * implementing common letters, digits and symbols.
+   */
+  if (key >= 0x20 && key < 0x80)
+    return key;
+
+  /*
+   * Function keys
+   *
+   * Both GDK_KEY_F* and RETRO_KEYBOARD_KEY_F* implement function keys 1—15 in a
+   * consecutive manner. GDK_KEY_F* actually implements more function keys but
+   * RETRO_KEYBOARD_KEY_F* doesn't.
+   */
+  if (key >= RETRO_KEYBOARD_KEY_F1 && key <= RETRO_KEYBOARD_KEY_F15)
+    return GDK_KEY_F1 + (key - RETRO_KEYBOARD_KEY_F1);
+
+  /*
+   * Keypad digits
+   *
+   * Both GDK_KEY_KP_* and RETRO_KEYBOARD_KEY_KP* implement keypad digits 0–9 in
+   * a consecutive manner.
+   */
+  if (key >= RETRO_KEYBOARD_KEY_KP0 && key <= RETRO_KEYBOARD_KEY_KP9)
+    return GDK_KEY_KP_0 + (key - RETRO_KEYBOARD_KEY_KP0);
+
+  /*
+   * Various keys
+   *
+   * FIXME: The following keys are unimplemented because I couldn't find the
+   * right GDK_KEY_* equivalent:
+   * - RETRO_KEYBOARD_KEY_MODE
+   * - RETRO_KEYBOARD_KEY_COMPOSE
+   * - RETRO_KEYBOARD_KEY_POWER
+   */
+  switch (key) {
+  case RETRO_KEYBOARD_KEY_BACKSPACE:
+    return GDK_KEY_BackSpace;
+  case RETRO_KEYBOARD_KEY_TAB:
+    return GDK_KEY_Tab;
+  case RETRO_KEYBOARD_KEY_CLEAR:
+    return GDK_KEY_Clear;
+  case RETRO_KEYBOARD_KEY_RETURN:
+    return GDK_KEY_Return;
+  case RETRO_KEYBOARD_KEY_PAUSE:
+    return GDK_KEY_Pause;
+  case RETRO_KEYBOARD_KEY_ESCAPE:
+    return GDK_KEY_Escape;
+  case RETRO_KEYBOARD_KEY_DELETE:
+    return GDK_KEY_Delete;
+
+  case RETRO_KEYBOARD_KEY_UP:
+    return GDK_KEY_Up;
+  case RETRO_KEYBOARD_KEY_DOWN:
+    return GDK_KEY_Down;
+  case RETRO_KEYBOARD_KEY_LEFT:
+    return GDK_KEY_Left;
+  case RETRO_KEYBOARD_KEY_RIGHT:
+    return GDK_KEY_Right;
+  case RETRO_KEYBOARD_KEY_INSERT:
+    return GDK_KEY_Insert;
+  case RETRO_KEYBOARD_KEY_HOME:
+    return GDK_KEY_Home;
+  case RETRO_KEYBOARD_KEY_END:
+    return GDK_KEY_End;
+  case RETRO_KEYBOARD_KEY_PAGEUP:
+    return GDK_KEY_Page_Up;
+  case RETRO_KEYBOARD_KEY_PAGEDOWN:
+    return GDK_KEY_Page_Down;
+
+  case RETRO_KEYBOARD_KEY_KP_PERIOD:
+    return GDK_KEY_KP_Decimal;
+  case RETRO_KEYBOARD_KEY_KP_DIVIDE:
+    return GDK_KEY_KP_Divide;
+  case RETRO_KEYBOARD_KEY_KP_MULTIPLY:
+    return GDK_KEY_KP_Multiply;
+  case RETRO_KEYBOARD_KEY_KP_MINUS:
+    return GDK_KEY_KP_Subtract;
+  case RETRO_KEYBOARD_KEY_KP_PLUS:
+    return GDK_KEY_KP_Add;
+  case RETRO_KEYBOARD_KEY_KP_ENTER:
+    return GDK_KEY_KP_Enter;
+  case RETRO_KEYBOARD_KEY_KP_EQUALS:
+    return GDK_KEY_KP_Equal;
+
+  case RETRO_KEYBOARD_KEY_NUMLOCK:
+    return GDK_KEY_Num_Lock;
+  case RETRO_KEYBOARD_KEY_CAPSLOCK:
+    return GDK_KEY_Caps_Lock;
+  case RETRO_KEYBOARD_KEY_SCROLLOCK:
+    return GDK_KEY_Scroll_Lock;
+  case RETRO_KEYBOARD_KEY_RSHIFT:
+    return GDK_KEY_Shift_R;
+  case RETRO_KEYBOARD_KEY_LSHIFT:
+    return GDK_KEY_Shift_L;
+  case RETRO_KEYBOARD_KEY_RCTRL:
+    return GDK_KEY_Control_R;
+  case RETRO_KEYBOARD_KEY_LCTRL:
+    return GDK_KEY_Control_L;
+  case RETRO_KEYBOARD_KEY_RALT:
+    return GDK_KEY_Alt_R;
+  case RETRO_KEYBOARD_KEY_LALT:
+    return GDK_KEY_Alt_L;
+  case RETRO_KEYBOARD_KEY_RMETA:
+    return GDK_KEY_Meta_R;
+  case RETRO_KEYBOARD_KEY_LMETA:
+    return GDK_KEY_Meta_L;
+  case RETRO_KEYBOARD_KEY_RSUPER:
+    return GDK_KEY_Super_R;
+  case RETRO_KEYBOARD_KEY_LSUPER:
+    return GDK_KEY_Super_L;
+
+  case RETRO_KEYBOARD_KEY_HELP:
+    return GDK_KEY_Help;
+  case RETRO_KEYBOARD_KEY_PRINT:
+    return GDK_KEY_Print;
+  case RETRO_KEYBOARD_KEY_SYSREQ:
+    return GDK_KEY_Sys_Req;
+  case RETRO_KEYBOARD_KEY_BREAK:
+    return GDK_KEY_Break;
+  case RETRO_KEYBOARD_KEY_MENU:
+    return GDK_KEY_Menu;
+  case RETRO_KEYBOARD_KEY_EURO:
+    return GDK_KEY_EuroSign;
+  case RETRO_KEYBOARD_KEY_UNDO:
+    return GDK_KEY_Undo;
+
+  default:
+    return GDK_KEY_VoidSymbol;
+  }
+}
diff --git a/retro-gtk/retro-keyboard-key.h b/retro-gtk/retro-keyboard-key.h
index f9ce061..115a1a2 100644
--- a/retro-gtk/retro-keyboard-key.h
+++ b/retro-gtk/retro-keyboard-key.h
@@ -170,6 +170,7 @@ typedef enum {
 RetroKeyboardModifierKey retro_keyboard_modifier_key_converter (guint keyval,
                                                                 GdkModifierType modifiers);
 RetroKeyboardKey retro_keyboard_key_converter (guint keyval);
+guint retro_keyboard_key_to_val_converter (RetroKeyboardKey key);
 
 G_END_DECLS