added support for separate busy animation for initial loading screen
[rocksndiamonds.git] / src / screens.c
index 816f01ed53d5cea7a8fb44025f4a045cb00d1e86..a80a51886a71520106fdda8ef1de1c5bc4fa5803 100644 (file)
 #define MENU_CHOOSE_TREE_FONT(x)       (FONT_TEXT_1 + (x))
 #define MENU_CHOOSE_TREE_COLOR(ti, a)  TREE_COLOR(ti, a)
 
+#define TEXT_NEXT_PAGE                 "Press any key or button for next page"
+#define TEXT_INFO_MENU                 "Press any key or button for info menu"
+
 // for input setup functions
 #define SETUPINPUT_SCREEN_POS_START    0
 #define SETUPINPUT_SCREEN_POS_EMPTY1   3
@@ -277,11 +280,11 @@ static void DrawInfoScreen_NotAvailable(char *, char *);
 static void DrawInfoScreen_HelpAnim(int, int, boolean);
 static void DrawInfoScreen_HelpText(int, int, int, int);
 static void HandleInfoScreen_Main(int, int, int, int, int);
-static void HandleInfoScreen_TitleScreen(int);
-static void HandleInfoScreen_Elements(int);
-static void HandleInfoScreen_Music(int);
+static void HandleInfoScreen_TitleScreen(int, int, int);
+static void HandleInfoScreen_Elements(int, int, int);
+static void HandleInfoScreen_Music(int, int, int);
 static void HandleInfoScreen_Credits(int, int, int);
-static void HandleInfoScreen_Program(int);
+static void HandleInfoScreen_Program(int, int, int);
 static void HandleInfoScreen_Version(int);
 
 static void ModifyGameSpeedIfNeeded(void);
@@ -683,6 +686,18 @@ struct TitleControlInfo
 
 struct TitleControlInfo title_controls[MAX_NUM_TITLE_SCREENS];
 
+
+// credits screens definitions
+
+static int num_credits_screens = 0;
+static boolean use_global_credits_screens = FALSE;
+
+
+// program info screens definitions
+
+static int num_program_info_screens = 0;
+
+
 // main menu display and control definitions
 
 #define MAIN_CONTROL_NAME                      0
@@ -1918,7 +1933,7 @@ void HandleTitleScreen(int mx, int my, int dx, int dy, int button)
   {
     return_to_main_menu = TRUE;
   }
-  else if (button == MB_MENU_CHOICE)
+  else if (button == MB_MENU_CHOICE || dx)
   {
     if (game_status_last_screen == GAME_MODE_INFO && num_title_screens == 0)
     {
@@ -1931,9 +1946,10 @@ void HandleTitleScreen(int mx, int my, int dx, int dy, int button)
       return;
     }
 
-    title_screen_nr++;
+    title_screen_nr +=
+      (game_status_last_screen == GAME_MODE_INFO && dx < 0 ? -1 : +1);
 
-    if (title_screen_nr < num_title_screens)
+    if (title_screen_nr >= 0 && title_screen_nr < num_title_screens)
     {
       tci = &title_controls[title_screen_nr];
 
@@ -2909,8 +2925,7 @@ void DrawInfoScreen_NotAvailable(char *text_title, char *text_error)
   DrawTextSCentered(ystart1, font_title, text_title);
   DrawTextSCentered(ystart2, font_error, text_error);
 
-  DrawTextSCentered(ybottom, font_foot,
-                   "Press any key or button for info menu");
+  DrawTextSCentered(ybottom, font_foot, TEXT_INFO_MENU);
 
   FadeIn(REDRAW_FIELD);
 }
@@ -2941,9 +2956,7 @@ void DrawInfoScreen_HelpAnim(int start, int max_anims, boolean init)
     DrawHeadline();
 
     DrawTextSCentered(ystart1, font_title, "The Game Elements:");
-
-    DrawTextSCentered(ybottom, font_foot,
-                     "Press any key or button for next page");
+    DrawTextSCentered(ybottom, font_foot, TEXT_NEXT_PAGE);
 
     FrameCounter = 0;
   }
@@ -3090,9 +3103,9 @@ static void DrawInfoScreen_TitleScreen(void)
   DrawTitleScreen();
 }
 
-void HandleInfoScreen_TitleScreen(int button)
+void HandleInfoScreen_TitleScreen(int dx, int dy, int button)
 {
-  HandleTitleScreen(0, 0, 0, 0, button);
+  HandleTitleScreen(0, 0, dx, dy, button);
 }
 
 static void DrawInfoScreen_Elements(void)
@@ -3104,12 +3117,12 @@ static void DrawInfoScreen_Elements(void)
   LoadHelpAnimInfo();
   LoadHelpTextInfo();
 
-  HandleInfoScreen_Elements(MB_MENU_INITIALIZE);
+  HandleInfoScreen_Elements(0, 0, MB_MENU_INITIALIZE);
 
   FadeIn(REDRAW_FIELD);
 }
 
-void HandleInfoScreen_Elements(int button)
+void HandleInfoScreen_Elements(int dx, int dy, int button)
 {
   static unsigned int info_delay = 0;
   static int num_anims;
@@ -3148,16 +3161,16 @@ void HandleInfoScreen_Elements(int button)
 
     return;
   }
-  else if (button == MB_MENU_CHOICE || button == MB_MENU_INITIALIZE)
+  else if (button == MB_MENU_CHOICE || button == MB_MENU_INITIALIZE || dx)
   {
     if (button != MB_MENU_INITIALIZE)
     {
       PlaySound(SND_MENU_ITEM_SELECTING);
 
-      page++;
+      page += (dx < 0 ? -1 : +1);
     }
 
-    if (page >= num_pages)
+    if (page < 0 || page >= num_pages)
     {
       FadeMenuSoundsAndMusic();
 
@@ -3167,7 +3180,7 @@ void HandleInfoScreen_Elements(int button)
       return;
     }
 
-    if (page > 0)
+    if (button != MB_MENU_INITIALIZE)
       FadeSetNextScreen();
 
     if (button != MB_MENU_INITIALIZE)
@@ -3199,12 +3212,12 @@ static void DrawInfoScreen_Music(void)
 
   LoadMusicInfo();
 
-  HandleInfoScreen_Music(MB_MENU_INITIALIZE);
+  HandleInfoScreen_Music(0, 0, MB_MENU_INITIALIZE);
 
   FadeIn(REDRAW_FIELD);
 }
 
-void HandleInfoScreen_Music(int button)
+void HandleInfoScreen_Music(int dx, int dy, int button)
 {
   static struct MusicFileInfo *list = NULL;
   int font_title = MENU_INFO_FONT_TITLE;
@@ -3229,11 +3242,8 @@ void HandleInfoScreen_Music(int button)
       ClearField();
       DrawHeadline();
 
-      DrawTextSCentered(ystart, font_title,
-                       "No music info for this level set.");
-
-      DrawTextSCentered(ybottom, font_foot,
-                       "Press any key or button for info menu");
+      DrawTextSCentered(ystart, font_title, "No music info for this level set.");
+      DrawTextSCentered(ybottom, font_foot, TEXT_INFO_MENU);
 
       return;
     }
@@ -3250,14 +3260,14 @@ void HandleInfoScreen_Music(int button)
 
     return;
   }
-  else if (button == MB_MENU_CHOICE || button == MB_MENU_INITIALIZE)
+  else if (button == MB_MENU_CHOICE || button == MB_MENU_INITIALIZE || dx)
   {
     if (button != MB_MENU_INITIALIZE)
     {
       PlaySound(SND_MENU_ITEM_SELECTING);
 
       if (list != NULL)
-       list = list->next;
+       list = (dx < 0 ? list->prev : list->next);
     }
 
     if (list == NULL)
@@ -3357,8 +3367,7 @@ void HandleInfoScreen_Music(int button)
       ystart += ystep_head;
     }
 
-    DrawTextSCentered(ybottom, FONT_TEXT_4,
-                     "Press any key or button for next page");
+    DrawTextSCentered(ybottom, font_foot, TEXT_NEXT_PAGE);
 
     if (button != MB_MENU_INITIALIZE)
       FadeIn(REDRAW_FIELD);
@@ -3371,17 +3380,11 @@ void HandleInfoScreen_Music(int button)
 static void DrawInfoScreen_CreditsScreen(int screen_nr)
 {
   int font_title = MENU_INFO_FONT_TITLE;
-  int font_head  = MENU_INFO_FONT_HEAD;
   int font_text  = MENU_INFO_FONT_TEXT;
   int font_foot  = MENU_INFO_FONT_FOOT;
   int spacing_title = menu.headline1_spacing_info[info_mode];
-  int spacing_head  = menu.headline2_spacing_info[info_mode];
-  int spacing_para  = menu.paragraph_spacing_info[info_mode];
   int spacing_line  = menu.line_spacing_info[info_mode];
   int ystep_title = getMenuTextStep(spacing_title, font_title);
-  int ystep_head  = getMenuTextStep(spacing_head,  font_head);
-  int ystep_para  = getMenuTextStep(spacing_para,  font_text);
-  int ystep_line  = getMenuTextStep(spacing_line,  font_text);
   int ystart  = mSY - SY + MENU_SCREEN_INFO_YSTART1;
   int ybottom = mSY - SY + MENU_SCREEN_INFO_YBOTTOM;
 
@@ -3389,214 +3392,26 @@ static void DrawInfoScreen_CreditsScreen(int screen_nr)
   DrawHeadline();
 
   DrawTextSCentered(ystart, font_title, "Credits:");
-  ystart += ystep_title;
 
-  if (screen_nr == 0)
-  {
-    DrawTextSCentered(ystart, font_head,
-                     "Special thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Peter Liepa");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for creating");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "\"Boulder Dash\"");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "in the year");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "1984");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "published by");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "First Star Software");
-  }
-  else if (screen_nr == 1)
-  {
-    DrawTextSCentered(ystart, font_head,
-                     "Special thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Klaus Heinz & Volker Wertich");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for creating");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "\"Emerald Mine\"");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "in the year");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "1987");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "published by");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Kingsoft");
-  }
-  else if (screen_nr == 2)
-  {
-    DrawTextSCentered(ystart, font_head,
-                     "Special thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Michael Stopp & Philip Jespersen");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for creating");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "\"Supaplex\"");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "in the year");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "1991");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "published by");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Digital Integration");
-  }
-  else if (screen_nr == 3)
-  {
-    DrawTextSCentered(ystart, font_head,
-                     "Special thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Hiroyuki Imabayashi");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for creating");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "\"Sokoban\"");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "in the year");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "1982");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "published by");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Thinking Rabbit");
-  }
-  else if (screen_nr == 4)
-  {
-    DrawTextSCentered(ystart, font_head,
-                     "Special thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Alan Bond");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "and");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "J\xfcrgen Bonhagen");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for the continuous creation");
-    ystart += ystep_line;
-    DrawTextSCentered(ystart, font_head,
-                     "of outstanding level sets");
-  }
-  else if (screen_nr == 5)
-  {
-    DrawTextSCentered(ystart, font_head,
-                     "Thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Peter Elzner");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for ideas and inspiration by");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Diamond Caves");
-    ystart += ystep_para;
-
-    DrawTextSCentered(ystart, font_head,
-                     "Thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Steffest");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for ideas and inspiration by");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "DX-Boulderdash");
-  }
-  else if (screen_nr == 6)
-  {
-    DrawTextSCentered(ystart, font_head,
-                     "Thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "David Tritscher");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for the code base used for the");
-    ystart += ystep_line;
-    DrawTextSCentered(ystart, font_head,
-                     "native Emerald Mine engine");
-  }
-  else if (screen_nr == 7)
-  {
-    DrawTextSCentered(ystart, font_head,
-                     "Thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Guido Schulz");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for the initial DOS port");
-    ystart += ystep_para;
-
-    DrawTextSCentered(ystart, font_head,
-                     "Thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "Karl H\xf6rnell");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "for some additional toons");
-  }
-  else if (screen_nr == 8)
-  {
-    DrawTextSCentered(ystart, font_head,
-                     "And not to forget:");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_head,
-                     "Many thanks to");
-    ystart += ystep_head;
-    DrawTextSCentered(ystart, font_text,
-                     "All those who contributed");
-    ystart += ystep_line;
-    DrawTextSCentered(ystart, font_text,
-                     "levels to this game");
-    ystart += ystep_line;
-    DrawTextSCentered(ystart, font_text,
-                     "since 1995");
-  }
+  char *filename = getCreditsFilename(screen_nr, use_global_credits_screens);
+  int width = SXSIZE;
+  int height = MENU_SCREEN_INFO_YBOTTOM - MENU_SCREEN_INFO_YSTART1;
+  int chars = width / getFontWidth(font_text);
+  int lines = height / getFontHeight(font_text);
+  int padx = (width - chars * getFontWidth(font_text)) / 2;
+  int line_spacing = getMenuTextSpacing(spacing_line, font_text);
+  boolean autowrap = FALSE;
+  boolean centered = TRUE;
+  boolean parse_comments = TRUE;
 
-  DrawTextSCentered(ybottom, font_foot,
-                   "Press any key or button for next page");
+  DrawTextFile(mSX + padx, mSY + MENU_SCREEN_INFO_YSTART1 + ystep_title,
+              filename, font_text, chars, -1, lines, line_spacing, -1,
+              autowrap, centered, parse_comments);
+
+  boolean last_screen = (screen_nr == num_credits_screens - 1);
+  char *text_foot = (last_screen ? TEXT_INFO_MENU : TEXT_NEXT_PAGE);
+
+  DrawTextSCentered(ybottom, font_foot, text_foot);
 }
 
 static void DrawInfoScreen_Credits(void)
@@ -3615,10 +3430,41 @@ static void DrawInfoScreen_Credits(void)
 void HandleInfoScreen_Credits(int dx, int dy, int button)
 {
   static int screen_nr = 0;
-  int num_screens = 9;
 
   if (button == MB_MENU_INITIALIZE)
   {
+    int i;
+
+    // determine number of (global or level set specific) credits screens
+    for (i = 0; i < 2; i++)
+    {
+      num_credits_screens = 0;
+      use_global_credits_screens = i;
+
+      while (getCreditsFilename(num_credits_screens,
+                               use_global_credits_screens) != NULL)
+       num_credits_screens++;
+
+      if (num_credits_screens > 0)
+       break;
+    }
+
+    if (num_credits_screens == 0)
+    {
+      int font_title = MENU_INFO_FONT_TITLE;
+      int font_foot  = MENU_INFO_FONT_FOOT;
+      int ystart  = mSY - SY + MENU_SCREEN_INFO_YSTART1;
+      int ybottom = mSY - SY + MENU_SCREEN_INFO_YBOTTOM;
+
+      ClearField();
+      DrawHeadline();
+
+      DrawTextSCentered(ystart, font_title, "No credits for this level set.");
+      DrawTextSCentered(ybottom, font_foot, TEXT_INFO_MENU);
+
+      return;
+    }
+
     screen_nr = 0;
 
     DrawInfoScreen_CreditsScreen(screen_nr);
@@ -3638,7 +3484,7 @@ void HandleInfoScreen_Credits(int dx, int dy, int button)
 
     screen_nr += (dx < 0 ? -1 : +1);
 
-    if (screen_nr < 0 || screen_nr >= num_screens)
+    if (screen_nr < 0 || screen_nr >= num_credits_screens)
     {
       FadeMenuSoundsAndMusic();
 
@@ -3662,68 +3508,89 @@ void HandleInfoScreen_Credits(int dx, int dy, int button)
   }
 }
 
-static void DrawInfoScreen_Program(void)
+static void DrawInfoScreen_ProgramScreen(int screen_nr)
 {
   int font_title = MENU_INFO_FONT_TITLE;
-  int font_head  = MENU_INFO_FONT_HEAD;
   int font_text  = MENU_INFO_FONT_TEXT;
   int font_foot  = MENU_INFO_FONT_FOOT;
   int spacing_title = menu.headline1_spacing_info[info_mode];
-  int spacing_head  = menu.headline2_spacing_info[info_mode];
-  int spacing_para  = menu.paragraph_spacing_info[info_mode];
   int spacing_line  = menu.line_spacing_info[info_mode];
   int ystep_title = getMenuTextStep(spacing_title, font_title);
-  int ystep_head  = getMenuTextStep(spacing_head,  font_head);
-  int ystep_para  = getMenuTextStep(spacing_para,  font_text);
-  int ystep_line  = getMenuTextStep(spacing_line,  font_text);
   int ystart  = mSY - SY + MENU_SCREEN_INFO_YSTART1;
   int ybottom = mSY - SY + MENU_SCREEN_INFO_YBOTTOM;
 
-  SetMainBackgroundImageIfDefined(IMG_BACKGROUND_INFO_PROGRAM);
-
-  FadeOut(REDRAW_FIELD);
-
   ClearField();
   DrawHeadline();
 
   DrawTextSCentered(ystart, font_title, "Program Information:");
-  ystart += ystep_title;
 
-  DrawTextSCentered(ystart, font_head,
-                   "This game is Freeware!");
-  ystart += ystep_head;
-  DrawTextSCentered(ystart, font_head,
-                   "If you like it, send e-mail to:");
-  ystart += ystep_head;
-  DrawTextSCentered(ystart, font_text,
-                   setup.internal.program_email);
-  ystart += ystep_para;
+  char *filename = getProgramInfoFilename(screen_nr);
+  int width = SXSIZE;
+  int height = MENU_SCREEN_INFO_YBOTTOM - MENU_SCREEN_INFO_YSTART1;
+  int chars = width / getFontWidth(font_text);
+  int lines = height / getFontHeight(font_text);
+  int padx = (width - chars * getFontWidth(font_text)) / 2;
+  int line_spacing = getMenuTextSpacing(spacing_line, font_text);
+  boolean autowrap = FALSE;
+  boolean centered = TRUE;
+  boolean parse_comments = TRUE;
 
-  DrawTextSCentered(ystart, font_head,
-                   "More information and levels:");
-  ystart += ystep_head;
-  DrawTextSCentered(ystart, font_text,
-                   setup.internal.program_website);
-  ystart += ystep_para;
+  DrawTextFile(mSX + padx, mSY + MENU_SCREEN_INFO_YSTART1 + ystep_title,
+              filename, font_text, chars, -1, lines, line_spacing, -1,
+              autowrap, centered, parse_comments);
 
-  DrawTextSCentered(ystart, font_head,
-                   "If you have created new levels,");
-  ystart += ystep_line;
-  DrawTextSCentered(ystart, font_head,
-                   "send them to me to include them!");
-  ystart += ystep_head;
-  DrawTextSCentered(ystart, font_head,
-                   ":-)");
+  boolean last_screen = (screen_nr == num_program_info_screens - 1);
+  char *text_foot = (last_screen ? TEXT_INFO_MENU : TEXT_NEXT_PAGE);
 
-  DrawTextSCentered(ybottom, font_foot,
-                   "Press any key or button for info menu");
+  DrawTextSCentered(ybottom, font_foot, text_foot);
+}
+
+static void DrawInfoScreen_Program(void)
+{
+  SetMainBackgroundImageIfDefined(IMG_BACKGROUND_INFO_PROGRAM);
+
+  FadeMenuSoundsAndMusic();
+
+  FadeOut(REDRAW_FIELD);
+
+  HandleInfoScreen_Program(0, 0, MB_MENU_INITIALIZE);
 
   FadeIn(REDRAW_FIELD);
 }
 
-void HandleInfoScreen_Program(int button)
+void HandleInfoScreen_Program(int dx, int dy, int button)
 {
-  if (button == MB_MENU_LEAVE)
+  static int screen_nr = 0;
+
+  if (button == MB_MENU_INITIALIZE)
+  {
+    // determine number of program info screens
+    num_program_info_screens = 0;
+
+    while (getProgramInfoFilename(num_program_info_screens) != NULL)
+      num_program_info_screens++;
+
+    if (num_program_info_screens == 0)
+    {
+      int font_title = MENU_INFO_FONT_TITLE;
+      int font_foot  = MENU_INFO_FONT_FOOT;
+      int ystart  = mSY - SY + MENU_SCREEN_INFO_YSTART1;
+      int ybottom = mSY - SY + MENU_SCREEN_INFO_YBOTTOM;
+
+      ClearField();
+      DrawHeadline();
+
+      DrawTextSCentered(ystart, font_title, "No program info available.");
+      DrawTextSCentered(ybottom, font_foot, TEXT_INFO_MENU);
+
+      return;
+    }
+
+    screen_nr = 0;
+
+    DrawInfoScreen_ProgramScreen(screen_nr);
+  }
+  else if (button == MB_MENU_LEAVE)
   {
     PlaySound(SND_MENU_ITEM_SELECTING);
 
@@ -3732,14 +3599,29 @@ void HandleInfoScreen_Program(int button)
 
     return;
   }
-  else if (button == MB_MENU_CHOICE)
+  else if (button == MB_MENU_CHOICE || dx)
   {
     PlaySound(SND_MENU_ITEM_SELECTING);
 
-    FadeMenuSoundsAndMusic();
+    screen_nr += (dx < 0 ? -1 : +1);
 
-    info_mode = INFO_MODE_MAIN;
-    DrawInfoScreen();
+    if (screen_nr < 0 || screen_nr >= num_program_info_screens)
+    {
+      FadeMenuSoundsAndMusic();
+
+      info_mode = INFO_MODE_MAIN;
+      DrawInfoScreen();
+
+      return;
+    }
+
+    FadeSetNextScreen();
+
+    FadeOut(REDRAW_FIELD);
+
+    DrawInfoScreen_ProgramScreen(screen_nr);
+
+    FadeIn(REDRAW_FIELD);
   }
   else
   {
@@ -3912,8 +3794,7 @@ static void DrawInfoScreen_Version(void)
   DrawTextF(xstart2, ystart, font_text, "%s", setup.system.sdl_audiodriver);
   DrawTextF(xstart3, ystart, font_text, "%s", driver_name);
 
-  DrawTextSCentered(ybottom, font_foot,
-                   "Press any key or button for info menu");
+  DrawTextSCentered(ybottom, font_foot, TEXT_INFO_MENU);
 
   FadeIn(REDRAW_FIELD);
 }
@@ -3949,6 +3830,7 @@ static void DrawInfoScreen_LevelSet(void)
   struct TitleMessageInfo *tmi = &readme;
   char *filename = getLevelSetInfoFilename();
   char *title = "Level Set Information:";
+  int font_foot = MENU_INFO_FONT_FOOT;
   int ystart  = mSY - SY + MENU_SCREEN_INFO_YSTART1;
   int ybottom = mSY - SY + MENU_SCREEN_INFO_YBOTTOM;
 
@@ -4000,8 +3882,7 @@ static void DrawInfoScreen_LevelSet(void)
               filename, tmi->font, tmi->chars, -1, tmi->lines, 0, -1,
               tmi->autowrap, tmi->centered, tmi->parse_comments);
 
-  DrawTextSCentered(ybottom, FONT_TEXT_4,
-                   "Press any key or button for info menu");
+  DrawTextSCentered(ybottom, font_foot, TEXT_INFO_MENU);
 
   FadeIn(REDRAW_FIELD);
 }
@@ -4060,15 +3941,15 @@ static void DrawInfoScreen(void)
 void HandleInfoScreen(int mx, int my, int dx, int dy, int button)
 {
   if (info_mode == INFO_MODE_TITLE)
-    HandleInfoScreen_TitleScreen(button);
+    HandleInfoScreen_TitleScreen(dx, dy, button);
   else if (info_mode == INFO_MODE_ELEMENTS)
-    HandleInfoScreen_Elements(button);
+    HandleInfoScreen_Elements(dx, dy, button);
   else if (info_mode == INFO_MODE_MUSIC)
-    HandleInfoScreen_Music(button);
+    HandleInfoScreen_Music(dx, dy, button);
   else if (info_mode == INFO_MODE_CREDITS)
     HandleInfoScreen_Credits(dx, dy, button);
   else if (info_mode == INFO_MODE_PROGRAM)
-    HandleInfoScreen_Program(button);
+    HandleInfoScreen_Program(dx, dy, button);
   else if (info_mode == INFO_MODE_VERSION)
     HandleInfoScreen_Version(button);
   else if (info_mode == INFO_MODE_LEVELSET)