Implemented help system (OK, has some memory corruption currently)

Makefile

@@ -1,4 +1,4 @@
-OBJS=menu.oo main.oo utils.oo frodo_menu.oo dialogue_box.oo
+OBJS=menu.oo main.oo utils.oo frodo_menu.oo dialogue_box.oo menu_messages.oo
 
 all: menu
 

frodo_menu.cpp

@@ -3,6 +3,7 @@
 
 #include "menu.hh"
 #include "frodo_menu.hh"
+#include "menu_messages.hh"
 #include "sdl_ttf_font.hh"
 #include "utils.hh"
 
@@ -21,30 +22,40 @@ const char *get_theme_path(const char *dir, const char *what)
 	return buf;
 }
 
+class HelpMenu : public Menu
+{
+public:
+	HelpMenu(Font *font, const char ***all_messages) : Menu(font)
+	{
+		this->all_messages = all_messages;
+	}
+
+	void updateHelpMessage(int which)
+	{
+		this->setText(this->all_messages[which]);
+	}
+
+	virtual void selectCallback(int which)
+	{
+	}
+	virtual void hoverCallback(int which)
+	{
+	}
+	virtual void escapeCallback(int which)
+	{
+	}
+
+protected:
+	const char ***all_messages;
+};
+
 class MainMenu : public Menu
 {
 public:
-	MainMenu(Font *font, GuiView *parent) : Menu(font)
+	MainMenu(Font *font, HelpMenu *help, GuiView *parent) : Menu(font)
 	{
-		static const char *messages[] = {
-				/*00*/          "File",
-		                /*01*/          "^|Insert|Start",
-		                /*02*/          "States",
-		                /*03*/          "^|Load|Save|Delete",
-		                /*04*/          "Keyboard",
-		                /*05*/          "^|Type|Macro|Bind",
-		                /*06*/          " ",
-		                /*07*/          "Reset the C=64",
-		                /*08*/          "Networking",
-		                /*09*/          "Options",
-		                /*10*/          "Advanced Options",
-		                /*11*/          "Help",
-		                /*12*/          "Quit",
-		                NULL
-		};
-
-		this->setText(messages);
 		this->parent = parent;
+		this->help = help;
 	}
 
 	virtual void selectCallback(int which)
@@ -57,6 +68,7 @@ public:
 	virtual void hoverCallback(int which)
 	{
 		printf("entry %d hover over: %s\n", which, this->pp_msgs[which]);
+		this->help->updateHelpMessage(which);
 	}
 
 	virtual void escapeCallback(int which)
@@ -66,6 +78,7 @@ public:
 
 private:
 	GuiView *parent;
+	HelpMenu *help;
 };
 
 
@@ -74,7 +87,9 @@ class MainView : public GuiView
 public:
 	MainView(Gui *parent) : GuiView(parent)
 	{
-		this->menu = new MainMenu(NULL, this);
+		this->help = new HelpMenu(NULL, main_menu_help);
+		this->menu = new MainMenu(NULL, this->help, this);
+		this->menu->setText(main_menu_messages);
 		this->bg = NULL;
 		this->infobox = NULL;
 		this->textbox = NULL;
@@ -87,6 +102,7 @@ public:
 		this->textbox = parent->textbox;
 
 		this->menu->setFont(this->parent->default_font);
+		this->help->setFont(this->parent->default_font);
 		this->menu->setSelectedBackground(this->parent->bg_left, this->parent->bg_middle,
 				this->parent->bg_right, this->parent->bg_submenu_left,
 				this->parent->bg_submenu_middle, this->parent->bg_submenu_right);
@@ -117,10 +133,12 @@ public:
 		 SDL_BlitSurface(this->textbox, NULL, where, &dst);
 
 		 this->menu->draw(where, 50, 70, 300, 400);
+		 this->help->draw(where, 354, 24, 264, 210);
 	}
 
 protected:
 	MainMenu *menu;
+	HelpMenu *help;
 	SDL_Surface *bg;
 	SDL_Surface *infobox;
 	SDL_Surface *textbox;

menu.cpp

@@ -35,9 +35,6 @@ void Menu::printText(SDL_Surface *where, const char *msg, SDL_Color clr,
 		int last_char = w / pixels_per_char;
 
 		/* FIXME! Handle some corner cases here (short strings etc) */
-		panic_if((unsigned)last_char > strlen(msg),
-				"last character (%d) is after the string length (%d)\n",
-				last_char, strlen(msg));
 		if (last_char > 3)
 		{
 			buf[last_char - 2] = '.';
@@ -101,7 +98,9 @@ void Menu::draw(SDL_Surface *where, int x, int y, int w, int h)
 	int entries_visible = h / line_height - 2;
 	int start_entry_visible = 0;
 
-	panic_if(!this->pp_msgs, "Set the messages before drawing, thank you\n");
+	/* No messages - nothing to draw */
+	if (!this->pp_msgs)
+		return;
 
 	if (this->cur_sel - start_entry_visible > entries_visible)
 	{
@@ -215,6 +214,9 @@ submenu_t *Menu::findSubmenu(int index)
 
 int Menu::selectOne(int which)
 {
+	panic_if(!this->pp_msgs,
+			"Can't select a message without any messages!");
+
 	if (which >= this->n_entries)
 		which = 0;
 	this->cur_sel = which;
@@ -222,6 +224,7 @@ int Menu::selectOne(int which)
 	if (this->pp_msgs[this->cur_sel][0] == ' ' ||
 			IS_SUBMENU(this->pp_msgs[this->cur_sel]))
 		this->selectNext(0, 1);
+	this->hoverCallback(this->cur_sel);
 
 	return this->cur_sel;
 }
@@ -230,6 +233,9 @@ int Menu::selectNext(int dx, int dy)
 {
 	int next;
 
+	panic_if(!this->pp_msgs,
+			"Can't select the next message without any messages!");
+
 	this->cur_sel = this->getNextEntry(dy);
 	next = this->getNextEntry(dy + 1);
 
@@ -254,20 +260,26 @@ int Menu::selectNext(int dx, int dy)
 
 int Menu::selectNext(event_t ev)
 {
+	int now = this->cur_sel;
+	int next;
+
 	switch (ev)
 	{
 	case KEY_UP:
-		this->selectNext(0, -1); break;
+		next = this->selectNext(0, -1); break;
 	case KEY_DOWN:
-		this->selectNext(0, 1); break;
+		next = this->selectNext(0, 1); break;
 	case KEY_LEFT:
-		this->selectNext(-1, 0); break;
+		next = this->selectNext(-1, 0); break;
 	case KEY_RIGHT:
-		this->selectNext(1, 0); break;
+		next = this->selectNext(1, 0); break;
 	default:
 		panic("selectNext(ev) called with event %d\n", ev);
 	}
 
+	if (now != next)
+		this->hoverCallback(this->cur_sel);
+
 	return this->cur_sel;
 }
 
@@ -283,14 +295,8 @@ void Menu::runLogic()
 		case KEY_DOWN:
 		case KEY_LEFT:
 		case KEY_RIGHT:
-		{
-			int now = this->cur_sel;
-			int next;
-
-			next = this->selectNext(ev);
-			if (now != next)
-				this->hoverCallback(this->cur_sel);
-		} break;
+			this->selectNext(ev);
+			break;
 		case KEY_SELECT:
 			this->selectCallback(this->cur_sel); break;
 		case KEY_ESCAPE:
@@ -376,6 +382,12 @@ void Menu::setText(const char **messages, int *submenu_defaults)
 	free(this->p_submenus);
 	free(this->pp_msgs);
 
+	/* Empty messages are allowed */
+	this->p_submenus = NULL;
+	this->pp_msgs = NULL;
+	if (!messages)
+		return;
+
 	for (this->n_entries = 0; messages[this->n_entries]; this->n_entries++)
 	{
 		/* Is this a submenu? */

menu.hh

@@ -104,7 +104,6 @@ protected:
 
 	event_t popEvent();
 
-	const char *title;
 	const char **pp_msgs;
 	Font *font;
 	SDL_Color text_color;

menu_messages.cpp

@@ -0,0 +1,54 @@
+#include <stdlib.h>
+
+#include "menu_messages.hh"
+
+const char **main_menu_messages = (const char*[]){
+		/*00*/          "File",
+		/*01*/          "^|Insert|Start",
+		/*02*/          "States",
+		/*03*/          "^|Load|Save|Delete",
+		/*04*/          "Keyboard",
+		/*05*/          "^|Type|Macro|Bind",
+		/*06*/          " ",
+		/*07*/          "Reset the C=64",
+		/*08*/          "Networking",
+		/*09*/          "Options",
+		/*10*/          "Help",
+		/*11*/          "Quit",
+		NULL
+};
+
+const char **main_menu_help[] = {
+		(const char*[]){
+				"Insert a disc/tape or",
+				"start it",
+				NULL,
+		},
+		NULL,
+		(const char*[]){
+				"Load/save or delete game",
+				"states",
+				NULL,
+		},
+		NULL,
+		(const char*[]){
+				"Bind keyboard keys to the",
+				"joysticks, use pre-defined",
+				"macros, or type with the",
+				"virtual keyboard",
+				NULL,
+		},
+		NULL,
+		NULL,
+		NULL,
+		(const char*[]){
+				"Networking menu for playing",
+				"C64 games online.",
+				NULL,
+		},
+		(const char*[]){
+				"Configure Frodo",
+				NULL,
+		},
+		NULL,
+};

menu_messages.hh

@@ -0,0 +1,7 @@
+#ifndef MENU_MESSAGES_HH
+#define MENU_MESSAGES_HH
+
+extern const char **main_menu_messages;
+extern const char **main_menu_help[];
+
+#endif