X-Git-Url: https://git.artsoft.org/?p=rocksndiamonds.git;a=blobdiff_plain;f=src%2Flibgame%2Fgadgets.c;h=4cf008fc01eaaec6044f85d3de57e00bfd4cad36;hp=aacadafad4cfec7fd7d80e42199eae8294ebc91b;hb=115ce6f2da1914d68b0fe0e5f9082973190dacdd;hpb=c781e660ed2fe6ad36c9eee0a77d64ee07163030

diff --git a/src/libgame/gadgets.c b/src/libgame/gadgets.c
index aacadafa..4cf008fc 100644
--- a/src/libgame/gadgets.c
+++ b/src/libgame/gadgets.c
@@ -1,20 +1,19 @@
-/***********************************************************
-* Artsoft Retro-Game Library                               *
-*----------------------------------------------------------*
-* (c) 1994-2002 Artsoft Entertainment                      *
-*               Holger Schemel                             *
-*               Detmolder Strasse 189                      *
-*               33604 Bielefeld                            *
-*               Germany                                    *
-*               e-mail: info@artsoft.org                   *
-*----------------------------------------------------------*
-* gadgets.c                                                *
-***********************************************************/
+// ============================================================================
+// Artsoft Retro-Game Library
+// ----------------------------------------------------------------------------
+// (c) 1995-2014 by Artsoft Entertainment
+//     		    Holger Schemel
+//		    info@artsoft.org
+//		    http://www.artsoft.org/
+// ----------------------------------------------------------------------------
+// gadgets.c
+// ============================================================================
 
 #include <stdarg.h>
 #include <string.h>
 
 #include "gadgets.h"
+#include "image.h"
 #include "text.h"
 #include "misc.h"
 
@@ -26,11 +25,31 @@
 #define DG_BUFFERED		0
 #define DG_DIRECT		1
 
+#define OPTION_TEXT_SELECTABLE(g, t)					\
+  (t[0] != g->selectbox.char_unselectable &&				\
+   t[0] != '\0' &&							\
+   !strEqual(t, " "))
+#define CURRENT_OPTION_SELECTABLE(g)					\
+  OPTION_TEXT_SELECTABLE(g, g->selectbox.options[g->selectbox.current_index].text)
+
+
 static struct GadgetInfo *gadget_list_first_entry = NULL;
 static struct GadgetInfo *gadget_list_last_entry = NULL;
+static struct GadgetInfo *last_info_gi = NULL;
 static int next_free_gadget_id = 1;
 static boolean gadget_id_wrapped = FALSE;
 
+static void (*PlayGadgetSoundActivating)(void) = NULL;
+static void (*PlayGadgetSoundSelecting)(void) = NULL;
+
+
+void InitGadgetsSoundCallback(void (*activating_function)(void),
+			      void (*selecting_function)(void))
+{
+  PlayGadgetSoundActivating = activating_function;
+  PlayGadgetSoundSelecting = selecting_function;
+}
+
 static struct GadgetInfo *getGadgetInfoFromGadgetID(int id)
 {
   struct GadgetInfo *gi = gadget_list_first_entry;
@@ -41,7 +60,7 @@ static struct GadgetInfo *getGadgetInfoFromGadgetID(int id)
   return gi;
 }
 
-static int getNewGadgetID()
+static int getNewGadgetID(void)
 {
   int id = next_free_gadget_id++;
 
@@ -64,24 +83,42 @@ static int getNewGadgetID()
   return id;
 }
 
-#if 0
-void DUMP_GADGET_MAP_STATE()
+static struct GadgetInfo *getGadgetInfoFromMousePosition(int mx, int my,
+							 int button)
 {
-  struct GadgetInfo *gi = gadget_list_first_entry;
+  struct GadgetInfo *gi;
 
-  while (gi != NULL)
+  /* first check for scrollbars in case of mouse scroll wheel button events */
+  if (IS_WHEEL_BUTTON(button))
   {
-    printf("-XXX-1-> '%s': %s\n",
-	   gi->info_text, (gi->mapped ? "mapped" : "not mapped"));
+    /* real horizontal wheel or vertical wheel with modifier key pressed */
+    boolean check_horizontal = (IS_WHEEL_BUTTON_HORIZONTAL(button) ||
+				GetKeyModState() & KMOD_Shift);
 
-    gi = gi->next;
-  }
-}
-#endif
+    /* check for the first active scrollbar directly under the mouse pointer */
+    for (gi = gadget_list_first_entry; gi != NULL; gi = gi->next)
+    {
+      if (gi->mapped && gi->active &&
+	  (gi->type & GD_TYPE_SCROLLBAR) &&
+	  mx >= gi->x && mx < gi->x + gi->width &&
+	  my >= gi->y && my < gi->y + gi->height)
+	return gi;
+    }
 
-static struct GadgetInfo *getGadgetInfoFromMousePosition(int mx, int my)
-{
-  struct GadgetInfo *gi;
+    /* check for the first active scrollbar with matching mouse wheel area */
+    for (gi = gadget_list_first_entry; gi != NULL; gi = gi->next)
+    {
+      if (gi->mapped && gi->active &&
+	  ((gi->type & GD_TYPE_SCROLLBAR_HORIZONTAL && check_horizontal) ||
+	   (gi->type & GD_TYPE_SCROLLBAR_VERTICAL && !check_horizontal)) &&
+	  mx >= gi->wheelarea.x && mx < gi->wheelarea.x + gi->wheelarea.width &&
+	  my >= gi->wheelarea.y && my < gi->wheelarea.y + gi->wheelarea.height)
+	return gi;
+    }
+
+    /* no active scrollbar found -- ignore this scroll wheel button event */
+    return NULL;
+  }
 
   /* open selectboxes may overlap other active gadgets, so check them first */
   for (gi = gadget_list_first_entry; gi != NULL; gi = gi->next)
@@ -178,26 +215,46 @@ static void default_callback_action(void *ptr)
 
 static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
 {
+  struct GadgetDesign *gd;
   int state = (pressed ? GD_BUTTON_PRESSED : GD_BUTTON_UNPRESSED);
-  struct GadgetDesign *gd = (!gi->active ? &gi->alt_design[state] :
-			     gi->checked ? &gi->alt_design[state] :
-			     &gi->design[state]);
   boolean redraw_selectbox = FALSE;
 
+  if (gi == NULL || gi->deactivated)
+    return;
+
+  gd = (!gi->active ? &gi->alt_design[state] :
+ 	gi->checked ? &gi->alt_design[state] : &gi->design[state]);
+
   switch (gi->type)
   {
     case GD_TYPE_NORMAL_BUTTON:
     case GD_TYPE_CHECK_BUTTON:
     case GD_TYPE_RADIO_BUTTON:
+
       BlitBitmapOnBackground(gd->bitmap, drawto,
 			     gd->x, gd->y, gi->width, gi->height,
 			     gi->x, gi->y);
+
       if (gi->deco.design.bitmap)
-	BlitBitmap(gi->deco.design.bitmap, drawto,
-		   gi->deco.design.x, gi->deco.design.y,
-		   gi->deco.width, gi->deco.height,
-		   gi->x + gi->deco.x + (pressed ? gi->deco.xshift : 0),
-		   gi->y + gi->deco.y + (pressed ? gi->deco.yshift : 0));
+      {
+	// make sure that decoration does not overlap gadget border
+	int deco_x = gi->deco.x + (pressed ? gi->deco.xshift : 0);
+	int deco_y = gi->deco.y + (pressed ? gi->deco.yshift : 0);
+	int deco_width  = MIN(gi->deco.width,  gi->width  - deco_x);
+	int deco_height = MIN(gi->deco.height, gi->height - deco_y);
+
+	if (gi->deco.masked)
+	  BlitBitmapMasked(gi->deco.design.bitmap, drawto,
+			   gi->deco.design.x, gi->deco.design.y,
+			   deco_width, deco_height,
+			   gi->x + deco_x, gi->y + deco_y);
+	else
+	  BlitBitmap(gi->deco.design.bitmap, drawto,
+		     gi->deco.design.x, gi->deco.design.y,
+		     deco_width, deco_height,
+		     gi->x + deco_x, gi->y + deco_y);
+      }
+
       break;
 
     case GD_TYPE_TEXT_BUTTON:
@@ -357,9 +414,9 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
 				   gi->height - 2 * border_y);
 
 	/* gadget text value */
-	DrawTextToTextArea(gi->x + border_x, gi->y + border_y,
-			   gi->textarea.value, font_nr,
-			   gi->textarea.xsize, gi->textarea.ysize);
+	DrawTextBuffer(gi->x + border_x, gi->y + border_y, gi->textarea.value,
+		       font_nr, gi->textarea.xsize, -1, gi->textarea.ysize, 0,
+		       BLIT_ON_BACKGROUND, FALSE, FALSE, FALSE);
 
 	cursor_letter = gi->textarea.value[gi->textarea.cursor_position];
 	cursor_string[0] = (cursor_letter != '\0' ? cursor_letter : ' ');
@@ -379,7 +436,8 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
       {
 	int i;
 	char text[MAX_GADGET_TEXTSIZE + 1];
-	int font_nr = (pressed ? gi->font_active : gi->font);
+	int font_nr_default = (pressed ? gi->font_active : gi->font);
+	int font_nr = font_nr_default;
 	int font_width = getFontWidth(font_nr);
 	int font_height = getFontHeight(font_nr);
 	int border_x = gi->border.xsize;
@@ -416,6 +474,10 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
 		gi->selectbox.size);
 	text[gi->selectbox.size] = '\0';
 
+	/* set font value */
+	font_nr = (OPTION_TEXT_SELECTABLE(gi, text) ? font_nr_default :
+		   gi->font_unselectable);
+
 	/* gadget text value */
 	DrawTextExt(drawto, gi->x + border_x, gi->y + border_y, text,
 		    font_nr, BLIT_MASKED);
@@ -524,7 +586,11 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
 	    strncpy(text, gi->selectbox.options[i].text, gi->selectbox.size);
 	    text[gi->selectbox.size] = '\0';
 
-	    if (i == gi->selectbox.current_index)
+	    font_nr = (OPTION_TEXT_SELECTABLE(gi, text) ? font_nr_default :
+		       gi->font_unselectable);
+
+	    if (i == gi->selectbox.current_index &&
+		OPTION_TEXT_SELECTABLE(gi, text))
 	    {
 	      FillRectangle(drawto,
 			    gi->selectbox.x + border_x,
@@ -551,15 +617,15 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
 	{
 	  gi->selectbox.open = FALSE;
 
-	  /* redraw closed selectbox */
-	  DrawGadget(gi, FALSE, FALSE);
-
 	  /* restore background under selectbox */
 	  BlitBitmap(gfx.field_save_buffer, drawto,
 		     gi->selectbox.x,     gi->selectbox.y,
 		     gi->selectbox.width, gi->selectbox.height,
 		     gi->selectbox.x,     gi->selectbox.y);
 
+	  /* redraw closed selectbox */
+	  DrawGadget(gi, FALSE, FALSE);
+
 	  redraw_selectbox = TRUE;
 	}
       }
@@ -588,7 +654,7 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
 			       xpos, ypos);
 
 	/* middle part of gadget */
-	for (i=0; i<num_steps; i++)
+	for (i=0; i < num_steps; i++)
 	  BlitBitmapOnBackground(gd->bitmap, drawto,
 				 gd->x, gd->y + gi->border.ysize,
 				 gi->width, design_body,
@@ -635,7 +701,7 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
 			       xpos, ypos);
 
 	/* middle part of gadget */
-	for (i=0; i<num_steps; i++)
+	for (i=0; i < num_steps; i++)
 	  BlitBitmapOnBackground(gd->bitmap, drawto,
 				 gd->x + gi->border.xsize, gd->y,
 				 design_body, gi->height,
@@ -663,6 +729,10 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
       return;
   }
 
+  // do not use direct gadget drawing anymore; this worked as a speed-up once,
+  // but would slow things down a lot now the screen is always fully redrawn
+  direct = FALSE;
+
   if (direct)
   {
     BlitBitmap(drawto, window,
@@ -675,19 +745,48 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
 		 gi->selectbox.x,     gi->selectbox.y);
   }
   else
-    redraw_mask |= (gi->x < gfx.sx + gfx.sxsize ? REDRAW_FIELD :
-		    gi->y < gfx.dy + gfx.dysize ? REDRAW_DOOR_1 :
-		    gi->y > gfx.vy ? REDRAW_DOOR_2 : REDRAW_DOOR_3);
+  {
+    int x = gi->x;
+    int y = gi->y;
+
+    redraw_mask |= (IN_GFX_FIELD_FULL(x, y) ? REDRAW_FIELD :
+		    IN_GFX_DOOR_1(x, y) ? REDRAW_DOOR_1 :
+		    IN_GFX_DOOR_2(x, y) ? REDRAW_DOOR_2 :
+		    IN_GFX_DOOR_3(x, y) ? REDRAW_DOOR_3 : REDRAW_ALL);
+  }
+}
+
+static int get_minimal_size_for_numeric_input(int minmax_value)
+{
+  int min_size = 1;	/* value needs at least one digit */
+  int i;
+
+  /* add number of digits needed for absolute value */
+  for (i = 10; i <= ABS(minmax_value); i *= 10)
+    min_size++;
+
+  /* if min/max value is negative, add one digit for minus sign */
+  if (minmax_value < 0)
+    min_size++;
+
+  return min_size;
 }
 
 static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 {
   int tag = first_tag;
 
+  if (gi == NULL || gi->deactivated)
+    return;
+
   while (tag != GDI_END)
   {
     switch(tag)
     {
+      case GDI_IMAGE_ID:
+	gi->image_id = va_arg(ap, int);
+	break;
+
       case GDI_CUSTOM_ID:
 	gi->custom_id = va_arg(ap, int);
 	break;
@@ -698,7 +797,7 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 
       case GDI_INFO_TEXT:
 	{
-	  int max_textsize = MAX_INFO_TEXTSIZE - 1;
+	  int max_textsize = MAX_INFO_TEXTSIZE;
 	  char *text = va_arg(ap, char *);
 
 	  if (text != NULL)
@@ -727,56 +826,53 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 	break;
 
       case GDI_TYPE:
-	gi->type = va_arg(ap, unsigned long);
+	gi->type = va_arg(ap, unsigned int);
 	break;
 
       case GDI_STATE:
-	gi->state = va_arg(ap, unsigned long);
+	gi->state = va_arg(ap, unsigned int);
 	break;
 
       case GDI_ACTIVE:
-	/* take care here: "boolean" is typedef'ed as "unsigned char",
-	   which gets promoted to "int" */
 	gi->active = (boolean)va_arg(ap, int);
 	break;
 
       case GDI_DIRECT_DRAW:
-	/* take care here: "boolean" is typedef'ed as "unsigned char",
-	   which gets promoted to "int" */
 	gi->direct_draw = (boolean)va_arg(ap, int);
 	break;
 
       case GDI_CHECKED:
-	/* take care here: "boolean" is typedef'ed as "unsigned char",
-	   which gets promoted to "int" */
 	gi->checked = (boolean)va_arg(ap, int);
 	break;
 
       case GDI_RADIO_NR:
-	gi->radio_nr = va_arg(ap, unsigned long);
+	gi->radio_nr = va_arg(ap, unsigned int);
 	break;
 
       case GDI_NUMBER_VALUE:
-	gi->textinput.number_value = va_arg(ap, long);
+	gi->textinput.number_value = va_arg(ap, int);
 	sprintf(gi->textinput.value, "%d", gi->textinput.number_value);
+	strcpy(gi->textinput.last_value, gi->textinput.value);
 	gi->textinput.cursor_position = strlen(gi->textinput.value);
 	break;
 
       case GDI_NUMBER_MIN:
-	gi->textinput.number_min = va_arg(ap, long);
+	gi->textinput.number_min = va_arg(ap, int);
 	if (gi->textinput.number_value < gi->textinput.number_min)
 	{
 	  gi->textinput.number_value = gi->textinput.number_min;
 	  sprintf(gi->textinput.value, "%d", gi->textinput.number_value);
+	  strcpy(gi->textinput.last_value, gi->textinput.value);
 	}
 	break;
 
       case GDI_NUMBER_MAX:
-	gi->textinput.number_max = va_arg(ap, long);
+	gi->textinput.number_max = va_arg(ap, int);
 	if (gi->textinput.number_value > gi->textinput.number_max)
 	{
 	  gi->textinput.number_value = gi->textinput.number_max;
 	  sprintf(gi->textinput.value, "%d", gi->textinput.number_value);
+	  strcpy(gi->textinput.last_value, gi->textinput.value);
 	}
 	break;
 
@@ -785,29 +881,39 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 	  int max_textsize = MAX_GADGET_TEXTSIZE;
 
 	  if (gi->textinput.size)
-	    max_textsize = MIN(gi->textinput.size, MAX_GADGET_TEXTSIZE - 1);
+	    max_textsize = MIN(gi->textinput.size, MAX_GADGET_TEXTSIZE);
 
 	  strncpy(gi->textinput.value, va_arg(ap, char *), max_textsize);
+	  strcpy(gi->textinput.last_value, gi->textinput.value);
+
 	  gi->textinput.value[max_textsize] = '\0';
 	  gi->textinput.cursor_position = strlen(gi->textinput.value);
 
 	  /* same tag also used for other gadget definitions */
 	  strcpy(gi->textbutton.value, gi->textinput.value);
 	  strcpy(gi->textarea.value, gi->textinput.value);
+	  strcpy(gi->textarea.last_value, gi->textinput.value);
 	}
 	break;
 
       case GDI_TEXT_SIZE:
 	{
 	  int tag_value = va_arg(ap, int);
-	  int max_textsize = MIN(tag_value, MAX_GADGET_TEXTSIZE - 1);
+	  int max_textsize = MIN(tag_value, MAX_GADGET_TEXTSIZE);
 
 	  gi->textinput.size = max_textsize;
 	  gi->textinput.value[max_textsize] = '\0';
+	  strcpy(gi->textinput.last_value, gi->textinput.value);
 
 	  /* same tag also used for other gadget definitions */
-	  strcpy(gi->textbutton.value, gi->textinput.value);
-	  gi->textbutton.size = gi->textinput.size;
+
+	  gi->textarea.size = max_textsize;
+	  gi->textarea.value[max_textsize] = '\0';
+	  strcpy(gi->textarea.last_value, gi->textinput.value);
+
+	  gi->textbutton.size = max_textsize;
+	  gi->textbutton.value[max_textsize] = '\0';
+
 	  gi->selectbox.size = gi->textinput.size;
 	}
 	break;
@@ -816,12 +922,18 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 	gi->font = va_arg(ap, int);
 	if (gi->font_active == 0)
 	  gi->font_active = gi->font;
+	if (gi->font_unselectable == 0)
+	  gi->font_unselectable = gi->font;
 	break;
 
       case GDI_TEXT_FONT_ACTIVE:
 	gi->font_active = va_arg(ap, int);
 	break;
 
+      case GDI_TEXT_FONT_UNSELECTABLE:
+	gi->font_unselectable = va_arg(ap, int);
+	break;
+
       case GDI_SELECTBOX_OPTIONS:
 	gi->selectbox.options = va_arg(ap, struct ValueTextInfo *);
 	break;
@@ -830,6 +942,10 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 	gi->selectbox.index = va_arg(ap, int);
 	break;
 
+      case GDI_SELECTBOX_CHAR_UNSELECTABLE:
+	gi->selectbox.char_unselectable = (char)va_arg(ap, int);
+	break;
+
       case GDI_DESIGN_UNPRESSED:
 	gi->design[GD_BUTTON_UNPRESSED].bitmap = va_arg(ap, Bitmap *);
 	gi->design[GD_BUTTON_UNPRESSED].x = va_arg(ap, int);
@@ -888,8 +1004,12 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 	gi->deco.yshift = va_arg(ap, int);
 	break;
 
+      case GDI_DECORATION_MASKED:
+	gi->deco.masked = (boolean)va_arg(ap, int);
+	break;
+
       case GDI_EVENT_MASK:
-	gi->event_mask = va_arg(ap, unsigned long);
+	gi->event_mask = va_arg(ap, unsigned int);
 	break;
 
       case GDI_AREA_SIZE:
@@ -897,14 +1017,12 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 	gi->drawing.area_ysize = va_arg(ap, int);
 
 	/* determine dependent values for drawing area gadget, if needed */
-	if (gi->width == 0 && gi->height == 0 &&
-	    gi->drawing.item_xsize !=0 && gi->drawing.item_ysize !=0)
+	if (gi->drawing.item_xsize != 0 && gi->drawing.item_ysize != 0)
 	{
 	  gi->width = gi->drawing.area_xsize * gi->drawing.item_xsize;
 	  gi->height = gi->drawing.area_ysize * gi->drawing.item_ysize;
 	}
-	else if (gi->drawing.item_xsize == 0 && gi->drawing.item_ysize == 0 &&
-		 gi->width != 0 && gi->height != 0)
+	else if (gi->width != 0 && gi->height != 0)
 	{
 	  gi->drawing.item_xsize = gi->width / gi->drawing.area_xsize;
 	  gi->drawing.item_ysize = gi->height / gi->drawing.area_ysize;
@@ -927,14 +1045,12 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 	gi->drawing.item_ysize = va_arg(ap, int);
 
 	/* determine dependent values for drawing area gadget, if needed */
-	if (gi->width == 0 && gi->height == 0 &&
-	    gi->drawing.area_xsize !=0 && gi->drawing.area_ysize !=0)
+	if (gi->drawing.area_xsize != 0 && gi->drawing.area_ysize != 0)
 	{
 	  gi->width = gi->drawing.area_xsize * gi->drawing.item_xsize;
 	  gi->height = gi->drawing.area_ysize * gi->drawing.item_ysize;
 	}
-	else if (gi->drawing.area_xsize == 0 && gi->drawing.area_ysize == 0 &&
-		 gi->width != 0 && gi->height != 0)
+	else if (gi->width != 0 && gi->height != 0)
 	{
 	  gi->drawing.area_xsize = gi->width / gi->drawing.item_xsize;
 	  gi->drawing.area_ysize = gi->height / gi->drawing.item_ysize;
@@ -953,6 +1069,22 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
 	gi->scrollbar.item_position = va_arg(ap, int);
 	break;
 
+      case GDI_WHEEL_AREA_X:
+	gi->wheelarea.x = va_arg(ap, int);
+	break;
+
+      case GDI_WHEEL_AREA_Y:
+	gi->wheelarea.y = va_arg(ap, int);
+	break;
+
+      case GDI_WHEEL_AREA_WIDTH:
+	gi->wheelarea.width = va_arg(ap, int);
+	break;
+
+      case GDI_WHEEL_AREA_HEIGHT:
+	gi->wheelarea.height = va_arg(ap, int);
+	break;
+
       case GDI_CALLBACK_INFO:
 	gi->callback_info = va_arg(ap, gadget_function);
 	break;
@@ -968,11 +1100,17 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
     tag = va_arg(ap, int);	/* read next tag */
   }
 
-  /* check if gadget is complete */
+  gi->deactivated = FALSE;
+
+  /* check if gadget has undefined bitmaps */
   if (gi->type != GD_TYPE_DRAWING_AREA &&
-      (!gi->design[GD_BUTTON_UNPRESSED].bitmap ||
-       !gi->design[GD_BUTTON_PRESSED].bitmap))
-    Error(ERR_EXIT, "gadget incomplete (missing Bitmap)");
+      (gi->design[GD_BUTTON_UNPRESSED].bitmap == NULL ||
+       gi->design[GD_BUTTON_PRESSED].bitmap == NULL))
+    gi->deactivated = TRUE;
+
+  /* check if gadget is placed off-screen */
+  if (gi->x < 0 || gi->y < 0)
+    gi->deactivated = TRUE;
 
   /* adjust gadget values in relation to other gadget values */
 
@@ -984,6 +1122,19 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
     int border_xsize = gi->border.xsize;
     int border_ysize = gi->border.ysize;
 
+    if (gi->type == GD_TYPE_TEXT_INPUT_NUMERIC)
+    {
+      int number_min = gi->textinput.number_min;
+      int number_max = gi->textinput.number_max;
+      int min_size_min = get_minimal_size_for_numeric_input(number_min);
+      int min_size_max = get_minimal_size_for_numeric_input(number_max);
+      int min_size = MAX(min_size_min, min_size_max);
+
+      /* expand gadget text input size, if maximal value is too large */
+      if (gi->textinput.size < min_size)
+	gi->textinput.size = min_size;
+    }
+
     gi->width  = 2 * border_xsize + (gi->textinput.size + 1) * font_width;
     gi->height = 2 * border_ysize + font_height;
   }
@@ -1025,7 +1176,11 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
     getFontCharSource(font_nr, FONT_ASCII_CURSOR, &src_bitmap, &src_x, &src_y);
     src_x += font_width / 2;
     src_y += font_height / 2;
-    gi->selectbox.inverse_color = GetPixel(src_bitmap, src_x, src_y);
+
+    /* there may be esoteric cases with missing or too small font bitmap */
+    if (src_bitmap != NULL &&
+	src_x < src_bitmap->width && src_y < src_bitmap->height)
+      gi->selectbox.inverse_color = GetPixel(src_bitmap, src_x, src_y);
 
     /* always start with closed selectbox */
     gi->selectbox.open = FALSE;
@@ -1058,16 +1213,23 @@ static void HandleGadgetTags(struct GadgetInfo *gi, int first_tag, va_list ap)
   if (gi->type & GD_TYPE_SCROLLBAR)
   {
     struct GadgetScrollbar *gs = &gi->scrollbar;
+    int scrollbar_size_cmp;
 
     if (gi->width == 0 || gi->height == 0 ||
 	gs->items_max == 0 || gs->items_visible == 0)
       Error(ERR_EXIT, "scrollbar gadget incomplete (missing tags)");
 
     /* calculate internal scrollbar values */
+    gs->size_min = (gi->type == GD_TYPE_SCROLLBAR_VERTICAL ?
+		    gi->width : gi->height);
     gs->size_max = (gi->type == GD_TYPE_SCROLLBAR_VERTICAL ?
 		    gi->height : gi->width);
-    gs->size = gs->size_max * gs->items_visible / gs->items_max;
-    gs->position = gs->size_max * gs->item_position / gs->items_max;
+
+    scrollbar_size_cmp = gs->size_max * gs->items_visible / gs->items_max;
+    gs->size = MAX(scrollbar_size_cmp, gs->size_min);
+    gs->size_max_cmp = (gs->size_max - (gs->size - scrollbar_size_cmp));
+
+    gs->position = gs->size_max_cmp * gs->item_position / gs->items_max;
     gs->position_max = gs->size_max - gs->size;
     gs->correction = gs->size_max / gs->items_max / 2;
 
@@ -1110,6 +1272,9 @@ void ModifyGadget(struct GadgetInfo *gi, int first_tag, ...)
 
 void RedrawGadget(struct GadgetInfo *gi)
 {
+  if (gi == NULL || gi->deactivated)
+    return;
+
   if (gi->mapped)
     DrawGadget(gi, gi->state, gi->direct_draw);
 }
@@ -1121,6 +1286,7 @@ struct GadgetInfo *CreateGadget(int first_tag, ...)
 
   /* always start with reliable default values */
   new_gadget->id = getNewGadgetID();
+  new_gadget->image_id = -1;
   new_gadget->callback_info = default_callback_info;
   new_gadget->callback_action = default_callback_action;
   new_gadget->active = TRUE;
@@ -1148,6 +1314,13 @@ void FreeGadget(struct GadgetInfo *gi)
 {
   struct GadgetInfo *gi_previous = gadget_list_first_entry;
 
+  if (gi == NULL)
+    return;
+
+  /* prevent "last_info_gi" from pointing to memory that will be freed */
+  if (last_info_gi == gi)
+    last_info_gi = NULL;
+
   while (gi_previous != NULL && gi_previous->next != gi)
     gi_previous = gi_previous->next;
 
@@ -1188,7 +1361,7 @@ static struct GadgetInfo *last_gi = NULL;
 
 static void MapGadgetExt(struct GadgetInfo *gi, boolean redraw)
 {
-  if (gi == NULL || gi->mapped)
+  if (gi == NULL || gi->deactivated || gi->mapped)
     return;
 
   gi->mapped = TRUE;
@@ -1204,7 +1377,7 @@ void MapGadget(struct GadgetInfo *gi)
 
 void UnmapGadget(struct GadgetInfo *gi)
 {
-  if (gi == NULL || !gi->mapped)
+  if (gi == NULL || gi->deactivated || !gi->mapped)
     return;
 
   gi->mapped = FALSE;
@@ -1220,9 +1393,11 @@ void UnmapGadget(struct GadgetInfo *gi)
 #define MULTIMAP_PLAYFIELD	(1 << 3)
 #define MULTIMAP_DOOR_1		(1 << 4)
 #define MULTIMAP_DOOR_2		(1 << 5)
+#define MULTIMAP_DOOR_3		(1 << 6)
 #define MULTIMAP_ALL		(MULTIMAP_PLAYFIELD | \
-				 MULTIMAP_DOOR_1 | \
-				 MULTIMAP_DOOR_2)
+				 MULTIMAP_DOOR_1    | \
+				 MULTIMAP_DOOR_2    | \
+				 MULTIMAP_DOOR_3)
 
 static void MultiMapGadgets(int mode)
 {
@@ -1232,12 +1407,13 @@ static void MultiMapGadgets(int mode)
 
   while (gi != NULL)
   {
-    if ((mode & MULTIMAP_PLAYFIELD &&
-	 gi->x < gfx.sx + gfx.sxsize) ||
-	(mode & MULTIMAP_DOOR_1 &&
-	 gi->x >= gfx.dx && gi->y < gfx.dy + gfx.dysize) ||
-	(mode & MULTIMAP_DOOR_2 &&
-	 gi->x >= gfx.dx && gi->y > gfx.dy + gfx.dysize) ||
+    int x = gi->x;
+    int y = gi->y;
+
+    if ((mode & MULTIMAP_PLAYFIELD && IN_GFX_FIELD_FULL(x, y)) ||
+	(mode & MULTIMAP_DOOR_1 && IN_GFX_DOOR_1(x, y)) ||
+	(mode & MULTIMAP_DOOR_2 && IN_GFX_DOOR_2(x, y)) ||
+	(mode & MULTIMAP_DOOR_3 && IN_GFX_DOOR_3(x, y)) ||
 	(mode & MULTIMAP_ALL) == MULTIMAP_ALL)
     {
       if (mode & MULTIMAP_UNMAP)
@@ -1256,40 +1432,64 @@ static void MultiMapGadgets(int mode)
   }
 }
 
-void UnmapAllGadgets()
+void UnmapAllGadgets(void)
 {
   MultiMapGadgets(MULTIMAP_ALL | MULTIMAP_UNMAP);
 }
 
-void RemapAllGadgets()
+void RemapAllGadgets(void)
 {
   MultiMapGadgets(MULTIMAP_ALL | MULTIMAP_REMAP);
 }
 
-static boolean anyTextInputGadgetActive()
+boolean anyTextInputGadgetActive(void)
 {
   return (last_gi && (last_gi->type & GD_TYPE_TEXT_INPUT) && last_gi->mapped);
 }
 
-static boolean anyTextAreaGadgetActive()
+boolean anyTextAreaGadgetActive(void)
 {
   return (last_gi && (last_gi->type & GD_TYPE_TEXT_AREA) && last_gi->mapped);
 }
 
-static boolean anySelectboxGadgetActive()
+boolean anySelectboxGadgetActive(void)
 {
   return (last_gi && (last_gi->type & GD_TYPE_SELECTBOX) && last_gi->mapped);
 }
 
-boolean anyTextGadgetActive()
+boolean anyScrollbarGadgetActive(void)
+{
+  return (last_gi && (last_gi->type & GD_TYPE_SCROLLBAR) && last_gi->mapped);
+}
+
+boolean anyTextGadgetActive(void)
 {
   return (anyTextInputGadgetActive() ||
 	  anyTextAreaGadgetActive() ||
 	  anySelectboxGadgetActive());
 }
 
+static boolean insideSelectboxLine(struct GadgetInfo *gi, int mx, int my)
+{
+  return (gi != NULL &&
+	  gi->type & GD_TYPE_SELECTBOX &&
+	  mx >= gi->x && mx < gi->x + gi->width &&
+	  my >= gi->y && my < gi->y + gi->height);
+}
+
+static boolean insideSelectboxArea(struct GadgetInfo *gi, int mx, int my)
+{
+  return (gi != NULL &&
+	  gi->type & GD_TYPE_SELECTBOX &&
+	  mx >= gi->selectbox.x && mx < gi->selectbox.x + gi->selectbox.width &&
+	  my >= gi->selectbox.y && my < gi->selectbox.y + gi->selectbox.height);
+}
+
 void ClickOnGadget(struct GadgetInfo *gi, int button)
 {
+  if (gi == NULL || gi->deactivated || !gi->mapped)
+    return;
+
   /* simulate releasing mouse button over last gadget, if still pressed */
   if (button_status)
     HandleGadgets(-1, -1, 0);
@@ -1301,32 +1501,42 @@ void ClickOnGadget(struct GadgetInfo *gi, int button)
   HandleGadgets(gi->x, gi->y, 0);
 }
 
-void HandleGadgets(int mx, int my, int button)
+boolean HandleGadgets(int mx, int my, int button)
 {
-  static struct GadgetInfo *last_info_gi = NULL;
-  static unsigned long pressed_delay = 0;
+  static unsigned int pressed_delay = 0;
+  static unsigned int pressed_delay_value = GADGET_FRAME_DELAY;
   static int last_button = 0;
   static int last_mx = 0, last_my = 0;
+  static int pressed_mx = 0, pressed_my = 0;
+  static boolean keep_selectbox_open = FALSE;
+  static boolean gadget_stopped = FALSE;
   int scrollbar_mouse_pos = 0;
   struct GadgetInfo *new_gi, *gi;
   boolean press_event;
   boolean release_event;
   boolean mouse_moving;
+  boolean mouse_inside_select_line;
+  boolean mouse_inside_select_area;
+  boolean mouse_released_where_pressed;
   boolean gadget_pressed;
   boolean gadget_pressed_repeated;
+  boolean gadget_pressed_off_borders;
+  boolean gadget_pressed_inside_select_line;
+  boolean gadget_pressed_delay_reached;
   boolean gadget_moving;
   boolean gadget_moving_inside;
   boolean gadget_moving_off_borders;
+  boolean gadget_draggable;
+  boolean gadget_dragging;
   boolean gadget_released;
   boolean gadget_released_inside;
-  boolean gadget_released_inside_select_line;
   boolean gadget_released_inside_select_area;
   boolean gadget_released_off_borders;
   boolean changed_position = FALSE;
 
   /* check if there are any gadgets defined */
   if (gadget_list_first_entry == NULL)
-    return;
+    return FALSE;
 
   /* simulated release of mouse button over last gadget */
   if (mx == -1 && my == -1 && button == 0)
@@ -1336,10 +1546,10 @@ void HandleGadgets(int mx, int my, int button)
   }
 
   /* check which gadget is under the mouse pointer */
-  new_gi = getGadgetInfoFromMousePosition(mx, my);
+  new_gi = getGadgetInfoFromMousePosition(mx, my, button);
 
   /* check if button state has changed since last invocation */
-  press_event = (button != 0 && last_button == 0);
+  press_event   = (button != 0 && last_button == 0);
   release_event = (button == 0 && last_button != 0);
   last_button = button;
 
@@ -1348,20 +1558,61 @@ void HandleGadgets(int mx, int my, int button)
   last_mx = mx;
   last_my = my;
 
+  if (press_event && new_gi != last_gi)
+  {
+    pressed_mx = mx;
+    pressed_my = my;
+  }
+
+  mouse_released_where_pressed =
+    (release_event && mx == pressed_mx && my == pressed_my);
+
+  mouse_inside_select_line = insideSelectboxLine(new_gi, mx, my);
+  mouse_inside_select_area = insideSelectboxArea(new_gi, mx, my);
+
+  gadget_pressed_off_borders = (press_event && new_gi != last_gi);
+
+  gadget_pressed_inside_select_line =
+    (press_event && new_gi != NULL &&
+     new_gi->type & GD_TYPE_SELECTBOX && new_gi->selectbox.open &&
+     insideSelectboxLine(new_gi, mx, my));
+
   /* if mouse button pressed outside text or selectbox gadget, deactivate it */
   if (anyTextGadgetActive() &&
-      button != 0 && !motion_status && new_gi != last_gi)
+      (gadget_pressed_off_borders ||
+       (gadget_pressed_inside_select_line && !mouse_inside_select_area)))
   {
-    CheckRangeOfNumericInputGadget(last_gi);	/* in case of numeric gadget */
+    struct GadgetInfo *gi = last_gi;
+    boolean gadget_changed = ((gi->event_mask & GD_EVENT_TEXT_LEAVING) != 0);
+
+    /* check if text gadget has changed its value */
+    if (gi->type & GD_TYPE_TEXT_INPUT)
+    {
+      CheckRangeOfNumericInputGadget(gi);
 
-    DrawGadget(last_gi, DG_UNPRESSED, last_gi->direct_draw);
+      if (!strEqual(gi->textinput.last_value, gi->textinput.value))
+	strcpy(gi->textinput.last_value, gi->textinput.value);
+      else
+	gadget_changed = FALSE;
+    }
 
-    last_gi->event.type = GD_EVENT_TEXT_LEAVING;
+    /* selectbox does not change its value when closed by clicking outside */
+    if (gi->type & GD_TYPE_SELECTBOX)
+      gadget_changed = FALSE;
+
+    DrawGadget(gi, DG_UNPRESSED, gi->direct_draw);
 
-    if (last_gi->event_mask & GD_EVENT_TEXT_LEAVING)
-      last_gi->callback_action(last_gi);
+    gi->event.type = GD_EVENT_TEXT_LEAVING;
+
+    if (gadget_changed && !(gi->type & GD_TYPE_SELECTBOX))
+      gi->callback_action(gi);
 
     last_gi = NULL;
+
+    if (gadget_pressed_inside_select_line)
+      new_gi = NULL;
+
+    StopTextInput();
   }
 
   gadget_pressed =
@@ -1369,6 +1620,9 @@ void HandleGadgets(int mx, int my, int button)
   gadget_pressed_repeated =
     (button != 0 && last_gi != NULL && new_gi == last_gi);
 
+  gadget_pressed_delay_reached =
+    DelayReached(&pressed_delay, pressed_delay_value);
+
   gadget_released =		(release_event && last_gi != NULL);
   gadget_released_inside =	(gadget_released && new_gi == last_gi);
   gadget_released_off_borders =	(gadget_released && new_gi != last_gi);
@@ -1379,21 +1633,13 @@ void HandleGadgets(int mx, int my, int button)
 
   /* when handling selectbox, set additional state values */
   if (gadget_released_inside && (last_gi->type & GD_TYPE_SELECTBOX))
-  {
-    struct GadgetInfo *gi = last_gi;
-
-    gadget_released_inside_select_line =
-      (mx >= gi->x && mx < gi->x + gi->width &&
-       my >= gi->y && my < gi->y + gi->height);
-    gadget_released_inside_select_area =
-      (mx >= gi->selectbox.x && mx < gi->selectbox.x + gi->selectbox.width &&
-       my >= gi->selectbox.y && my < gi->selectbox.y + gi->selectbox.height);
-  }
+    gadget_released_inside_select_area = insideSelectboxArea(last_gi, mx, my);
   else
-  {
-    gadget_released_inside_select_line = FALSE;
     gadget_released_inside_select_area = FALSE;
-  }
+
+  /* setting state for handling over-large selectbox */
+  if (keep_selectbox_open && (press_event || !mouse_inside_select_line))
+    keep_selectbox_open = FALSE;
 
   /* if new gadget pressed, store this gadget  */
   if (gadget_pressed)
@@ -1410,12 +1656,18 @@ void HandleGadgets(int mx, int my, int button)
   /* if mouse button released, no gadget needs to be handled anymore */
   if (gadget_released)
   {
-    if (last_gi->type & GD_TYPE_SELECTBOX &&
-	(gadget_released_inside_select_line ||
-	 gadget_released_off_borders))		     /* selectbox stays open */
+    if (gi->type & GD_TYPE_SELECTBOX &&
+	(keep_selectbox_open ||
+	 mouse_released_where_pressed ||
+	 !gadget_released_inside_select_area ||
+	 !CURRENT_OPTION_SELECTABLE(gi)))	    /* selectbox stays open */
+    {
       gi->selectbox.stay_open = TRUE;
-    else if (!(last_gi->type & GD_TYPE_TEXT_INPUT ||
-	       last_gi->type & GD_TYPE_TEXT_AREA))  /* text input stays open */
+      pressed_mx = 0;
+      pressed_my = 0;
+    }
+    else if (!(gi->type & GD_TYPE_TEXT_INPUT ||
+	       gi->type & GD_TYPE_TEXT_AREA))	    /* text input stays open */
       last_gi = NULL;
   }
 
@@ -1423,20 +1675,32 @@ void HandleGadgets(int mx, int my, int button)
   if (button == 0 && !release_event)
     gi = new_gi;
 
+  /* if new gadget or if no gadget was pressed, release stopped processing */
+  if (gadget_pressed || new_gi == NULL)
+    gadget_stopped = FALSE;
+
+  /* if gadget was stopped while being handled, stop gadget processing here */
+  if (gadget_stopped)
+    return TRUE;
+
   if (gi != NULL)
   {
     int last_x = gi->event.x;
     int last_y = gi->event.y;
+    int last_mx = gi->event.mx;
+    int last_my = gi->event.my;
 
-    gi->event.x = mx - gi->x;
-    gi->event.y = my - gi->y;
+    gi->event.x = gi->event.mx = mx - gi->x;
+    gi->event.y = gi->event.my = my - gi->y;
 
     if (gi->type == GD_TYPE_DRAWING_AREA)
     {
       gi->event.x /= gi->drawing.item_xsize;
       gi->event.y /= gi->drawing.item_ysize;
 
-      if (last_x != gi->event.x || last_y != gi->event.y)
+      if (last_x != gi->event.x || last_y != gi->event.y ||
+	  ((last_mx != gi->event.mx || last_my != gi->event.my) &&
+	   gi->event_mask & GD_EVENT_PIXEL_PRECISE))
 	changed_position = TRUE;
     }
     else if (gi->type & GD_TYPE_TEXT_INPUT && button != 0 && !motion_status)
@@ -1454,6 +1718,9 @@ void HandleGadgets(int mx, int my, int button)
 
       if (gi->textinput.cursor_position != old_cursor_position)
 	DrawGadget(gi, DG_PRESSED, gi->direct_draw);
+
+      if (press_event)
+	StartTextInput(gi->x, gi->y, gi->width, gi->height);
     }
     else if (gi->type & GD_TYPE_TEXT_AREA && button != 0 && !motion_status)
     {
@@ -1468,8 +1735,12 @@ void HandleGadgets(int mx, int my, int button)
 
       if (gi->textarea.cursor_position != old_cursor_position)
 	DrawGadget(gi, DG_PRESSED, gi->direct_draw);
+
+      if (press_event)
+	StartTextInput(gi->x, gi->y, gi->width, gi->height);
     }
-    else if (gi->type & GD_TYPE_SELECTBOX)
+    else if (gi->type & GD_TYPE_SELECTBOX && gi->selectbox.open &&
+	     !keep_selectbox_open)
     {
       int old_index = gi->selectbox.current_index;
 
@@ -1497,7 +1768,7 @@ void HandleGadgets(int mx, int my, int button)
       new_gi->event.type = GD_EVENT_INFO_ENTERING;
       new_gi->callback_info(new_gi);
     }
-    else if (last_info_gi != NULL)
+    else if (last_info_gi != NULL && last_info_gi->mapped)
     {
       last_info_gi->event.type = GD_EVENT_INFO_LEAVING;
       last_info_gi->callback_info(last_info_gi);
@@ -1506,69 +1777,72 @@ void HandleGadgets(int mx, int my, int button)
     last_info_gi = new_gi;
   }
 
-  if (gadget_pressed)
-  {
-    if (gi->type == GD_TYPE_CHECK_BUTTON)
-    {
-      gi->checked = !gi->checked;
-    }
-    else if (gi->type == GD_TYPE_RADIO_BUTTON)
-    {
-      struct GadgetInfo *rgi = gadget_list_first_entry;
+  gadget_draggable = (gi && gi->type & GD_TYPE_SCROLLBAR);
 
-      while (rgi)
-      {
-	if (rgi->mapped &&
-	    rgi->type == GD_TYPE_RADIO_BUTTON &&
-	    rgi->radio_nr == gi->radio_nr &&
-	    rgi != gi)
-	{
-	  rgi->checked = FALSE;
-	  DrawGadget(rgi, DG_UNPRESSED, rgi->direct_draw);
-	}
+  /* reset drag position for newly pressed scrollbar to "not dragging" */
+  if (gadget_pressed && gadget_draggable)
+    gi->scrollbar.drag_position = -1;
 
-	rgi = rgi->next;
-      }
+  gadget_dragging = (gadget_draggable && gi->scrollbar.drag_position != -1);
 
-      gi->checked = TRUE;
+  /* clicking next to a scrollbar to move it is not considered "moving" */
+  if (gadget_draggable && !gadget_dragging)
+    gadget_moving = FALSE;
+
+  /* when leaving scrollbar area when jump-scrolling, stop gadget processing */
+  if (gadget_draggable && !gadget_dragging && gadget_moving_off_borders)
+    gadget_stopped = TRUE;
+
+  if ((gadget_pressed) ||
+      (gadget_pressed_repeated && gadget_pressed_delay_reached))
+  {
+    if (gadget_pressed)		/* gadget pressed the first time */
+    {
+      /* initialize delay counter */
+      DelayReached(&pressed_delay, 0);
+
+      /* start gadget delay with longer delay after first click on gadget */
+      pressed_delay_value = GADGET_FRAME_DELAY_FIRST;
     }
-    else if (gi->type & GD_TYPE_SCROLLBAR)
+    else			/* gadget hold pressed for some time */
     {
-      int mpos, gpos;
+      /* after first repeated gadget click, continue with shorter delay value */
+      pressed_delay_value = GADGET_FRAME_DELAY;
+    }
 
-      if (gi->type == GD_TYPE_SCROLLBAR_HORIZONTAL)
-      {
-	mpos = mx;
-	gpos = gi->x;
-      }
-      else
-      {
-	mpos = my;
-	gpos = gi->y;
-      }
+    if (gi->type & GD_TYPE_SCROLLBAR && !gadget_dragging)
+    {
+      int mpos = (gi->type == GD_TYPE_SCROLLBAR_HORIZONTAL ? mx    : my);
+      int gpos = (gi->type == GD_TYPE_SCROLLBAR_HORIZONTAL ? gi->x : gi->y);
+      int slider_start = gpos + gi->scrollbar.position;
+      int slider_end   = gpos + gi->scrollbar.position + gi->scrollbar.size - 1;
+      boolean inside_slider = (mpos >= slider_start && mpos <= slider_end);
 
-      if (mpos >= gpos + gi->scrollbar.position &&
-	  mpos < gpos + gi->scrollbar.position + gi->scrollbar.size)
-      {
-	/* drag scrollbar */
-	gi->scrollbar.drag_position =
-	  scrollbar_mouse_pos - gi->scrollbar.position;
-      }
-      else
+      if (IS_WHEEL_BUTTON(button) || !inside_slider)
       {
 	/* click scrollbar one scrollbar length up/left or down/right */
 
 	struct GadgetScrollbar *gs = &gi->scrollbar;
 	int old_item_position = gs->item_position;
+	int item_steps = gs->items_visible - 1;
+	int item_direction = (mpos < gpos + gi->scrollbar.position ? -1 : +1);
+
+	if (IS_WHEEL_BUTTON(button))
+	{
+	  boolean scroll_single_step = ((GetKeyModState() & KMOD_Alt) != 0);
+
+	  item_steps = (scroll_single_step ? 1 : wheel_steps);
+	  item_direction = (button == MB_WHEEL_UP ||
+			    button == MB_WHEEL_LEFT ? -1 : +1);
+	}
 
 	changed_position = FALSE;
 
-	gs->item_position +=
-	  gs->items_visible * (mpos < gpos + gi->scrollbar.position ? -1 : +1);
+	gs->item_position += item_steps * item_direction;
 
 	if (gs->item_position < 0)
 	  gs->item_position = 0;
-	if (gs->item_position > gs->items_max - gs->items_visible)
+	else if (gs->item_position > gs->items_max - gs->items_visible)
 	  gs->item_position = gs->items_max - gs->items_visible;
 
 	if (old_item_position != gs->item_position)
@@ -1587,12 +1861,70 @@ void HandleGadgets(int mx, int my, int button)
 	if (gi->event_mask & GD_EVENT_MOVING && changed_position)
 	  gi->callback_action(gi);
 
-	/* don't handle this scrollbar anymore while mouse button pressed */
-	last_gi = NULL;
+	return TRUE;
+      }
+      else
+      {
+	/* don't handle this scrollbar anymore when mouse position reached */
+	if (gadget_pressed_repeated)
+	{
+	  gadget_stopped = TRUE;
+
+	  return TRUE;
+	}
+      }
+    }
+  }
+
+  if (gadget_pressed)
+  {
+    PlayGadgetSoundActivating();
+
+    if (gi->type == GD_TYPE_CHECK_BUTTON)
+    {
+      gi->checked = !gi->checked;
+    }
+    else if (gi->type == GD_TYPE_RADIO_BUTTON)
+    {
+      struct GadgetInfo *rgi = gadget_list_first_entry;
+
+      while (rgi)
+      {
+	if (rgi->mapped &&
+	    rgi->type == GD_TYPE_RADIO_BUTTON &&
+	    rgi->radio_nr == gi->radio_nr &&
+	    rgi != gi)
+	{
+	  rgi->checked = FALSE;
+	  DrawGadget(rgi, DG_UNPRESSED, rgi->direct_draw);
+	}
+
+	rgi = rgi->next;
+      }
+
+      gi->checked = TRUE;
+    }
+    else if (gi->type & GD_TYPE_SCROLLBAR)
+    {
+      int mpos = (gi->type == GD_TYPE_SCROLLBAR_HORIZONTAL ? mx    : my);
+      int gpos = (gi->type == GD_TYPE_SCROLLBAR_HORIZONTAL ? gi->x : gi->y);
+      int slider_start = gpos + gi->scrollbar.position;
+      int slider_end   = gpos + gi->scrollbar.position + gi->scrollbar.size - 1;
+      boolean inside_slider = (mpos >= slider_start && mpos <= slider_end);
 
-	return;
+      if (!IS_WHEEL_BUTTON(button) && inside_slider)
+      {
+	/* start dragging scrollbar */
+	gi->scrollbar.drag_position =
+	  scrollbar_mouse_pos - gi->scrollbar.position;
       }
     }
+    else if (gi->type & GD_TYPE_SELECTBOX)
+    {
+      /* keep selectbox open in case of over-large selectbox */
+      keep_selectbox_open = (mouse_inside_select_line &&
+			     mouse_inside_select_area);
+    }
 
     DrawGadget(gi, DG_PRESSED, gi->direct_draw);
 
@@ -1601,9 +1933,6 @@ void HandleGadgets(int mx, int my, int button)
     gi->event.button = button;
     gi->event.off_borders = FALSE;
 
-    /* initialize delay counter */
-    DelayReached(&pressed_delay, 0);
-
     if (gi->event_mask & GD_EVENT_PRESSED)
       gi->callback_action(gi);
   }
@@ -1612,8 +1941,7 @@ void HandleGadgets(int mx, int my, int button)
   {
     gi->event.type = GD_EVENT_PRESSED;
 
-    if (gi->event_mask & GD_EVENT_REPEATED &&
-	DelayReached(&pressed_delay, GADGET_FRAME_DELAY))
+    if (gi->event_mask & GD_EVENT_REPEATED && gadget_pressed_delay_reached)
       gi->callback_action(gi);
   }
 
@@ -1626,7 +1954,7 @@ void HandleGadgets(int mx, int my, int button)
       else if (gadget_moving_off_borders && gi->state == GD_BUTTON_PRESSED)
 	DrawGadget(gi, DG_UNPRESSED, gi->direct_draw);
     }
-    else if (gi->type & GD_TYPE_SELECTBOX)
+    else if (gi->type & GD_TYPE_SELECTBOX && !keep_selectbox_open)
     {
       int old_index = gi->selectbox.current_index;
 
@@ -1650,13 +1978,22 @@ void HandleGadgets(int mx, int my, int button)
 
       gs->position = scrollbar_mouse_pos - gs->drag_position;
 
-      if (gs->position < 0)
+      /* make sure to always precisely reach end positions when dragging */
+      if (gs->position <= 0)
+      {
 	gs->position = 0;
-      if (gs->position > gs->position_max)
+	gs->item_position = 0;
+      }
+      else if (gs->position >= gs->position_max)
+      {
 	gs->position = gs->position_max;
-
-      gs->item_position =
-	gs->items_max * (gs->position + gs->correction) / gs->size_max;
+	gs->item_position = gs->items_max - gs->items_visible;
+      }
+      else
+      {
+	gs->item_position =
+	  gs->items_max * (gs->position + gs->correction) / gs->size_max_cmp;
+      }
 
       if (gs->item_position < 0)
 	gs->item_position = 0;
@@ -1672,7 +2009,7 @@ void HandleGadgets(int mx, int my, int button)
       DrawGadget(gi, DG_PRESSED, gi->direct_draw);
     }
 
-    gi->state = (gadget_moving_inside || gi->type & GD_TYPE_SCROLLBAR ?
+    gi->state = (gadget_moving_inside || gadget_draggable ?
 		 GD_BUTTON_PRESSED : GD_BUTTON_UNPRESSED);
     gi->event.type = GD_EVENT_MOVING;
     gi->event.off_borders = gadget_moving_off_borders;
@@ -1685,14 +2022,22 @@ void HandleGadgets(int mx, int my, int button)
   if (gadget_released_inside)
   {
     boolean deactivate_gadget = TRUE;
+    boolean gadget_changed = TRUE;
 
     if (gi->type & GD_TYPE_SELECTBOX)
     {
-      if (gadget_released_inside_select_line ||
-	  gadget_released_off_borders)		    /* selectbox stays open */
+      if (keep_selectbox_open ||
+	  mouse_released_where_pressed ||
+	  !gadget_released_inside_select_area ||
+	  !CURRENT_OPTION_SELECTABLE(gi))	    /* selectbox stays open */
+      {
 	deactivate_gadget = FALSE;
-      else
+	gadget_changed = FALSE;
+      }
+      else if (gi->selectbox.index != gi->selectbox.current_index)
 	gi->selectbox.index = gi->selectbox.current_index;
+      else
+	gadget_changed = FALSE;
     }
 
     if (deactivate_gadget &&
@@ -1703,8 +2048,10 @@ void HandleGadgets(int mx, int my, int button)
     gi->state = GD_BUTTON_UNPRESSED;
     gi->event.type = GD_EVENT_RELEASED;
 
-    if ((gi->event_mask & GD_EVENT_RELEASED) && deactivate_gadget)
+    if ((gi->event_mask & GD_EVENT_RELEASED) && gadget_changed)
+    {
       gi->callback_action(gi);
+    }
   }
 
   if (gadget_released_off_borders)
@@ -1712,6 +2059,7 @@ void HandleGadgets(int mx, int my, int button)
     if (gi->type & GD_TYPE_SCROLLBAR)
       DrawGadget(gi, DG_UNPRESSED, gi->direct_draw);
 
+    gi->state = GD_BUTTON_UNPRESSED;
     gi->event.type = GD_EVENT_RELEASED;
 
     if (gi->event_mask & GD_EVENT_RELEASED &&
@@ -1722,14 +2070,17 @@ void HandleGadgets(int mx, int my, int button)
   /* handle gadgets unmapped/mapped between pressing and releasing */
   if (release_event && !gadget_released && new_gi)
     new_gi->state = GD_BUTTON_UNPRESSED;
+
+  return (gadget_pressed || gadget_pressed_repeated ||
+	  gadget_released || gadget_moving);
 }
 
 static void insertCharIntoTextArea(struct GadgetInfo *gi, char c)
 {
-  char text[MAX_GADGET_TEXTSIZE];
+  char text[MAX_GADGET_TEXTSIZE + 1];
   int cursor_position = gi->textarea.cursor_position;
 
-  if (strlen(gi->textarea.value) == MAX_GADGET_TEXTSIZE) /* no space left */
+  if (strlen(gi->textarea.value) >= MAX_GADGET_TEXTSIZE) /* no space left */
     return;
 
   strcpy(text, gi->textarea.value);
@@ -1739,22 +2090,42 @@ static void insertCharIntoTextArea(struct GadgetInfo *gi, char c)
   setTextAreaCursorPosition(gi, gi->textarea.cursor_position + 1);
 }
 
-void HandleGadgetsKeyInput(Key key)
+boolean HandleGadgetsKeyInput(Key key)
 {
   struct GadgetInfo *gi = last_gi;
 
-  if (gi == NULL || !gi->mapped ||
+  if (gi == NULL || gi->deactivated || !gi->mapped ||
       !(gi->type & GD_TYPE_TEXT_INPUT ||
 	gi->type & GD_TYPE_TEXT_AREA ||
 	gi->type & GD_TYPE_SELECTBOX))
-    return;
+    return FALSE;
 
-  if (key == KSYM_Return)	/* valid for both text input and selectbox */
+  if (key == KSYM_Escape)
+  {
+    StopTextInput();
+  }
+  else if (key == KSYM_Return)	/* valid for both text input and selectbox */
   {
+    boolean gadget_changed = ((gi->event_mask & GD_EVENT_TEXT_RETURN) != 0);
+
     if (gi->type & GD_TYPE_TEXT_INPUT)
+    {
       CheckRangeOfNumericInputGadget(gi);
+
+      if (!strEqual(gi->textinput.last_value, gi->textinput.value))
+	strcpy(gi->textinput.last_value, gi->textinput.value);
+      else
+	gadget_changed = FALSE;
+
+      StopTextInput();
+    }
     else if (gi->type & GD_TYPE_SELECTBOX)
-      gi->selectbox.index = gi->selectbox.current_index;
+    {
+      if (gi->selectbox.index != gi->selectbox.current_index)
+	gi->selectbox.index = gi->selectbox.current_index;
+      else
+	gadget_changed = FALSE;
+    }
 
     if (gi->type & GD_TYPE_TEXT_AREA)
     {
@@ -1771,12 +2142,12 @@ void HandleGadgetsKeyInput(Key key)
       last_gi = NULL;
     }
 
-    if (gi->event_mask & GD_EVENT_TEXT_RETURN)
+    if (gadget_changed)
       gi->callback_action(gi);
   }
   else if (gi->type & GD_TYPE_TEXT_INPUT)	/* only valid for text input */
   {
-    char text[MAX_GADGET_TEXTSIZE];
+    char text[MAX_GADGET_TEXTSIZE + 1];
     int text_length = strlen(gi->textinput.value);
     int cursor_pos = gi->textinput.cursor_position;
     char letter = getCharFromKey(key);
@@ -1823,7 +2194,7 @@ void HandleGadgetsKeyInput(Key key)
   }
   else if (gi->type & GD_TYPE_TEXT_AREA)	/* only valid for text area */
   {
-    char text[MAX_GADGET_TEXTSIZE];
+    char text[MAX_GADGET_TEXTSIZE + 1];
     int text_length = strlen(gi->textarea.value);
     int area_ysize = gi->textarea.ysize;
     int cursor_x_pref = gi->textarea.cursor_x_preferred;
@@ -1899,4 +2270,46 @@ void HandleGadgetsKeyInput(Key key)
       DrawGadget(gi, DG_PRESSED, gi->direct_draw);
     }
   }
+
+  return TRUE;
+}
+
+void DumpGadgetIdentifiers(void)
+{
+  struct GadgetInfo *gi;
+
+  Print("Gadgets on current screen:\n");
+
+  for (gi = gadget_list_first_entry; gi != NULL; gi = gi->next)
+  {
+    if (gi->mapped && gi->image_id != -1)
+    {
+      char *token = getTokenFromImageID(gi->image_id);
+      char *prefix = "gfx.";
+
+      if (strPrefix(token, prefix))
+	token = &token[strlen(prefix)];
+
+      Print("- '%s'\n", token);
+    }
+  }
+
+  Print("Done.\n");
+}
+
+boolean DoGadgetAction(int image_id)
+{
+  struct GadgetInfo *gi;
+
+  for (gi = gadget_list_first_entry; gi != NULL; gi = gi->next)
+  {
+    if (gi->mapped && gi->image_id == image_id)
+    {
+      gi->callback_action(gi);
+
+      return TRUE;
+    }
+  }
+
+  return FALSE;
 }