ack, forgot to add file

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6121 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/rockboy/menu.c

@@ -0,0 +1,303 @@
+/*********************************************************************/
+/* menu.c - user menu for rockboy                                    */
+/*                                                                   */
+/* Note: this file only exposes one function: do_user_menu().        */
+/*********************************************************************/
+
+#include "stdlib.h"
+#include "string.h"
+#include "button.h"
+#include "rockmacros.h"
+
+/* load/save state function declarations */
+static void do_slot_menu(bool is_load);
+
+#define MENU_CANCEL (-1)
+static int do_menu(char *title, char **items, size_t num_items, int sel_item);
+
+/* main menu items */
+#define MAIN_MENU_TITLE "RockBoy Menu"
+typedef enum {
+  ITEM_BACK,
+  ITEM_LOAD,
+  ITEM_SAVE,
+  ITEM_OPT,
+  ITEM_QUIT,
+  ITEM_LAST
+} MainMenuItem;
+
+/* strings for the main menu */
+static const char *main_menu[] = {
+  "Back to Game",
+  "Load State...",
+  "Save State...",
+  "Options...",
+  "Quit RockBoy"
+};
+
+typedef enum {
+  ITEM_SLOT1,
+  ITEM_SLOT2,
+  ITEM_SLOT3,
+  ITEM_SLOT4,
+  ITEM_SLOT5
+} SlotMenuItem;
+
+/* this is evil, but we snprintf() into it later :( */
+static const char *slot_menu[] = {
+  "1.                  ",
+  "2.                  ",
+  "3.                  ",
+  "4.                  ",
+  "5.                  "
+};
+
+/*
+ * do_user_menu - create the user menu on the screen.
+ *
+ * Returns USER_MENU_QUIT if the user selected "quit", otherwise 
+ * returns zero.
+ *
+ * Note: this is the only non-static function in this file at the
+ * moment.  In the future I may turn do_menu/etc into a proper API, in
+ * which case they'll be exposed as well.
+ *
+ */
+int do_user_menu(void) {
+  int mi, ret, num_items;
+  bool done = false;
+
+  /* set defaults */
+  ret = 0; /* return value */
+  mi = 0; /* initial menu selection */
+  num_items = sizeof(main_menu) / sizeof(char*);
+  
+  /* loop until we should exit menu */
+  while (!done) {
+    /* get item selection */
+    mi = do_menu(MAIN_MENU_TITLE, (char**) main_menu, num_items, mi);
+    
+    /* handle selected menu item */
+    switch (mi) {
+      case ITEM_QUIT:
+        ret = USER_MENU_QUIT;
+      case MENU_CANCEL:
+      case ITEM_BACK:
+        done = true;
+        break;
+      case ITEM_LOAD:
+        do_slot_menu(1);
+        break;
+      case ITEM_SAVE:
+        do_slot_menu(0);
+        break;
+    }
+  }
+
+  /* return somethin' */
+  return ret;
+}
+
+/*
+ * do_load_menu - prompt the user for a memory slot
+ *
+ * TOOD
+ *
+ */
+static void do_slot_menu(bool is_load) {
+  int i, mi, ret, num_items;
+  bool done = false;
+  char *title;
+
+  /* set defaults */
+  ret = 0; /* return value */
+  mi = 0; /* initial menu selection */
+  num_items = sizeof(slot_menu) / sizeof(char*);
+  
+  /* create menu items */
+  for (i = 0; i < num_items; i++) {
+    /* TODO: get slot info here */
+    snprintf((char*) slot_menu[i], sizeof(slot_menu[i]), "%2d. %s", i + 1, "<empty>");
+  }
+  
+  /* set menu title */
+  title = is_load ? "Load State" : "Save State";
+
+  /* loop until we should exit menu */
+  while (!done) {
+    /* get item selection */
+    mi = do_menu(title, (char**) slot_menu, num_items, mi);
+    
+    /* handle selected menu item */
+    if (mi == MENU_CANCEL) {
+      done = true;
+      break;
+    } else {
+      if (is_load) {
+        /* TODO: load slot here */
+      } else {
+        /* TODO: save slot here */
+      }
+    }
+  }
+}
+
+/*********************************************************************/
+/*  MENU FUNCTIONS                                                   */
+/*********************************************************************/
+/* at some point i'll make this a generic menu interface, but for now,
+ * these defines will suffice */
+#define MENU_X 10
+#define MENU_Y 10
+#define MENU_WIDTH (LCD_WIDTH - 2 * MENU_X)
+#define MENU_HEIGHT (LCD_HEIGHT - 2 * MENU_Y)
+#define MENU_RECT MENU_X, MENU_Y, MENU_WIDTH, MENU_HEIGHT
+#define SHADOW_RECT MENU_X + 1, MENU_Y + 1, MENU_WIDTH, MENU_HEIGHT
+#define MENU_ITEM_PAD 2
+
+/*
+ * select_item - select menu item (after deselecting current item)
+ */
+static void select_item(char *title, int curr_item, size_t item_i) {
+  int x, y, w, h;
+
+  /* get size of title, use that as height ofr all lines */
+  rb->lcd_getstringsize(title, &w, &h);
+  h += MENU_ITEM_PAD * 2;
+
+  /* calc x and width */
+  x = MENU_X + MENU_ITEM_PAD;
+  w = MENU_WIDTH - 2 * MENU_ITEM_PAD;
+
+  /* if there is a current item, then deselect it */
+  if (curr_item >= 0) {
+    /* deselect old item */
+    y = MENU_Y + h + MENU_ITEM_PAD * 2; /* account for title */
+    y += h * curr_item;
+    rb->lcd_invertrect(x, y, w, h);
+  }
+
+  /* select new item */
+  curr_item = item_i;
+
+  /* select new item */
+  y = MENU_Y + h + MENU_ITEM_PAD * 2; /* account for title */
+  y += h * curr_item;
+  rb->lcd_invertrect(x, y, w, h);
+
+  /* update the menu window */
+  rb->lcd_update_rect(MENU_RECT);
+}
+
+/*
+ * draw_menu - draw menu on screen
+ *
+ * Returns MENU_CANCEL if the user cancelled, or the item number of the
+ * selected item.
+ *
+ */
+static void draw_menu(char *title, char **items, size_t num_items)  {
+  size_t i;
+  int x, y, w, h, by;
+
+  /* set to default? font */
+  /* rb->lcd_setfont(0); */
+  
+  /* draw the outline */
+  rb->lcd_fillrect(SHADOW_RECT);
+  rb->lcd_clearrect(MENU_RECT);
+  rb->lcd_drawrect(MENU_RECT);
+
+  /* calculate x/y */
+  x = MENU_X + MENU_ITEM_PAD;
+  y = MENU_Y + MENU_ITEM_PAD * 2;
+  rb->lcd_getstringsize(title, &w, &h);
+  h += MENU_ITEM_PAD * 2;
+
+  /* draw menu stipple */
+  for (i = MENU_Y; i < (size_t) y + h; i += 2)
+    rb->lcd_drawline(MENU_X, i, MENU_X + MENU_WIDTH, i);
+
+  /* clear title rect */
+  rb->lcd_clearrect((LCD_WIDTH - w) / 2 - 2, y - 2, w + 4, h);
+  
+  /* draw centered title on screen */
+  rb->lcd_putsxy((LCD_WIDTH - w)/2, y, title);
+  
+  /* calculate base Y for items */
+  by = y + h + MENU_ITEM_PAD;
+  
+  /* iterate over each item and draw it on the screen */
+  for (i = 0; i < num_items; i++)
+    rb->lcd_putsxy(x, by + h * i, items[i]);
+
+  /* update the screen */
+  rb->lcd_update();
+}
+
+/*
+ * do_menu - draw menu on screen.
+ *
+ * Draw a menu titled @title on the screen, with @num_items elements
+ * from @items, and select the @sel element.  If in doubt, set @sel to
+ * -1 :).
+ *
+ */
+static int do_menu(char *title, char **items, size_t num_items, int sel) {
+  int btn, sel_item, ret, curr_item;
+  bool done = false;
+  ret = MENU_CANCEL;
+
+  /* draw menu on screen and select the first item */
+  draw_menu(title, items, num_items);
+  curr_item = -1;
+  select_item(title, curr_item, sel);
+  curr_item = sel;
+
+  /* make sure button state is empty */
+  while (rb->button_get(false) != BUTTON_NONE) 
+    rb->yield();
+
+  /* loop until the menu is finished */
+  while (!done) {
+    /* grab a button */
+    btn = rb->button_get(true);
+
+    /* handle the button */
+    switch (btn) {
+      case BUTTON_DOWN:
+        /* select next item in list */
+        sel_item = curr_item + 1;
+        if (sel_item >= (int) num_items)
+          sel_item = 0;
+        select_item(title, curr_item, sel_item);
+        curr_item = sel_item;
+        break;
+      case BUTTON_UP:
+        /* select prev item in list */
+        sel_item = curr_item - 1;
+        if (sel_item < 0)
+          sel_item = num_items - 1;
+        select_item(title, curr_item, sel_item);
+        curr_item = sel_item;
+        break;
+      case BUTTON_RIGHT:
+        /* select current item */
+        ret = curr_item;
+        done = true;
+        break;
+      case BUTTON_LEFT:
+      case BUTTON_SELECT:
+        /* cancel out of menu */
+        ret = MENU_CANCEL;
+        done = true;
+        break;
+    }
+    
+    /* give the OS some love */
+    rb->yield();
+  }
+  
+  /* return selected item */
+  return ret;
+}