MM: MM1: Implementing most of item trade

devtools/create_mm/files/mm1/strings_en.yml

@@ -27,6 +27,7 @@
 		legend4: "'ESC' TO GO BACK  'G' GATHER  'U' USE"
 		equip: "EQUIP WHICH ITEM: 'A'-'F'?"
 		remove: "REMOVE WHICH ITEM: '1'-'6'?"
+		which: "WHICH ITEM: 'A'-'F'?"
 		wrong_class: "*** WRONG CLASS ***"
 		have_armor: "*** ALREADY WEARING ARMOR ***"
 		not_equipped: "*** NOT EQUIPPED ***"

engines/mm/mm1/data/char.cpp

@@ -173,6 +173,22 @@ void Character::gatherGold() {
 	_gold = total;
 }
 
+Character::TradeResult Character::trade(int whoTo, int itemIndex) {
+	Character &dest = g_globals->_party[whoTo];
+	if (&dest == this)
+		return TRADE_SUCCESS;
+
+	if (dest._backpack.full())
+		return TRADE_FULL;
+	if (!_backpack[itemIndex])
+		return TRADE_NO_ITEM;
+
+	// TODO: do the trade
+
+	return TRADE_SUCCESS;
+}
+
+
 Character::LevelIncrease Character::increaseLevel() {
 	_level = ++_levelBase;
 	_age = ++_ageBase;

engines/mm/mm1/data/char.h

@@ -182,6 +182,12 @@ struct Character {
 	 */
 	void gatherGold();
 
+	/**
+	 * Trade an item to another
+	 */
+	enum TradeResult { TRADE_SUCCESS, TRADE_NO_ITEM, TRADE_FULL };
+	TradeResult trade(int whoTo, int itemIndex);
+
 	/**
 	 * Increase the character's level by 1 at a trainer
 	 */

engines/mm/mm1/views/character_info.cpp

@@ -87,6 +87,11 @@ void CharacterInfo::draw() {
 		escToGoBack(0);
 		break;
 
+	case TRADE_ITEM:
+		writeString(10, 20, STRING["dialogs.character.which"]);
+		escToGoBack(0);
+		break;
+
 	default:
 		break;
 	}
@@ -182,7 +187,36 @@ bool CharacterInfo::msgKeypress(const KeypressMessage &msg) {
 			);
 
 		} else if (msg.keycode == Common::KEYCODE_4) {
-			// TODO: Trade item
+			if (g_globals->_party[_tradeWith]._backpack.full()) {
+				writeString(14, 21, STRING["dialogs.character.full"]);
+				Sound::sound(SOUND_2);
+				_state = DISPLAY;
+				delaySeconds(3);
+			} else {
+				_state = TRADE_ITEM;
+				redraw();
+			}
+		}
+		break;
+
+	case TRADE_ITEM:
+		if (msg.keycode >= Common::KEYCODE_a &&
+				msg.keycode <= Common::KEYCODE_f) {
+			switch (g_globals->_currCharacter->trade(_tradeWith,
+				msg.keycode - Common::KEYCODE_a)) {
+			case Character::TRADE_FULL:
+				writeString(14, 21, STRING["dialogs.character.full"]);
+				_state = DISPLAY;
+				delaySeconds(3);
+				break;
+			case Character::TRADE_SUCCESS:
+				_state = DISPLAY;
+				redraw();
+				break;
+			default:
+				// Do nothing, no item at selected index
+				break;
+			}
 		}
 		break;
 

engines/mm/mm1/views/character_info.h

@@ -38,7 +38,7 @@ class CharacterInfo : public CharacterBase {
 private:
 	enum ViewState {
 		DISPLAY, EQUIP, GATHER, REMOVE, SHARE,
-		TRADE_WITH, TRADE_KIND, TRADE_WHAT };
+		TRADE_WITH, TRADE_KIND, TRADE_ITEM };
 	ViewState _state = DISPLAY;
 	Common::String _newName;
 private: