TITANIC: Implemented drag/drop handling

7 files changed, 123 insertions, 21 deletions

diff --git a/engines/titanic/game_manager.cpp b/engines/titanic/game_manager.cpp
index aeacd73890..a2732d8b1c 100644
--- a/engines/titanic/game_manager.cpp
+++ b/engines/titanic/game_manager.cpp
@@ -48,7 +48,7 @@ CGameManager::CGameManager(CProjectItem *project, CGameView *gameView):
 		_inputHandler(this), _inputTranslator(&_inputHandler),		
 		_gameState(this), _sound(this), _musicRoom(this),
 		_field30(0), _field34(0), _field4C(0), 
-		_field50(0), _field54(0), _tickCount1(0), _tickCount2(0) {
+		_dragItem(nullptr), _field54(0), _tickCount1(0), _tickCount2(0) {
 	
 	_videoSurface1 = nullptr;
 	_videoSurface2 = CScreenManager::_screenManagerPtr->createSurface(600, 340);
diff --git a/engines/titanic/game_manager.h b/engines/titanic/game_manager.h
index d132ff39ef..a331f3a0b4 100644
--- a/engines/titanic/game_manager.h
+++ b/engines/titanic/game_manager.h
@@ -61,7 +61,6 @@ private:
 	int _field34;
 	CVideoSurface *_videoSurface1;
 	int _field4C;
-	int _field50;
 	int _field54;
 	CVideoSurface *_videoSurface2;
 	uint _tickCount1;
@@ -72,6 +71,7 @@ public:
 	Common::Rect _bounds;
 	CInputHandler _inputHandler;
 	CInputTranslator _inputTranslator;
+	CTreeItem *_dragItem;
 public:
 	CGameManager(CProjectItem *project, CGameView *gameView);
 	~CGameManager();
diff --git a/engines/titanic/game_state.cpp b/engines/titanic/game_state.cpp
index 3ce8b2b42e..30185fc5f6 100644
--- a/engines/titanic/game_state.cpp
+++ b/engines/titanic/game_state.cpp
@@ -30,7 +30,7 @@ CGameState::CGameState(CGameManager *gameManager) :
 		_gameManager(gameManager), _gameLocation(this),
 		_field8(0), _fieldC(0), _mode(GSMODE_0), _field14(0), _field18(0),
 		_field1C(0), _field20(0), _field24(0), _field28(0), _field2C(0),
-		_field30(0), _field34(0), _field38(0) {
+		_field38(0) {
 }
 
 void CGameState::save(SimpleFile *file) const {
@@ -78,4 +78,8 @@ void CGameState::setMode(GameStateMode newMode) {
 	_mode = newMode;
 }
 
+void CGameState::setMousePos(const Common::Point &pt) {
+	_mousePos = pt;
+}
+
 } // End of namespace Titanic z
diff --git a/engines/titanic/game_state.h b/engines/titanic/game_state.h
index 3c3b720d95..1c0b750a44 100644
--- a/engines/titanic/game_state.h
+++ b/engines/titanic/game_state.h
@@ -56,8 +56,7 @@ public:
 	int _field24;
 	int _field28;
 	int _field2C;
-	int _field30;
-	int _field34;
+	Common::Point _mousePos;
 	int _field38;
 public:
 	CGameState(CGameManager *gameManager);
@@ -76,6 +75,11 @@ public:
 	 * Sets a new mode
 	 */
 	void setMode(GameStateMode newMode);
+
+	/**
+	 * Sets the current mouse position
+	 */
+	void setMousePos(const Common::Point &pt);
 };
 
 } // End of namespace Titanic
diff --git a/engines/titanic/input_handler.cpp b/engines/titanic/input_handler.cpp
index d7199215f7..5d50c00377 100644
--- a/engines/titanic/input_handler.cpp
+++ b/engines/titanic/input_handler.cpp
@@ -24,13 +24,13 @@
 #include "titanic/game_manager.h"
 #include "titanic/screen_manager.h"
 #include "titanic/titanic.h"
+#include "titanic/pet_control/pet_control.h"
 
 namespace Titanic {
 
 CInputHandler::CInputHandler(CGameManager *owner) :
-		_gameManager(owner), _inputTranslator(nullptr),
-		_field4(0), _field8(0), _fieldC(0), _field10(0), _field14(0),
-		_lockCount(0), _field24(0) {
+		_gameManager(owner), _inputTranslator(nullptr), _dragging(false),
+		_buttonDown(false), _dragItem(nullptr),  _lockCount(0), _field24(0) {
 	CScreenManager::_screenManagerPtr->_inputHandler = this;
 }
 
@@ -51,15 +51,91 @@ void CInputHandler::decLockCount() {
 void CInputHandler::handleMessage(const CMessage &msg, bool respectLock) {
 	if (!respectLock || _lockCount <= 0) {
 		if (_gameManager->_gameState._mode == GSMODE_1) {
-			processMessage(msg);
+			processMessage(&msg);
 		} else if (!msg.isMouseMsg()) {
 			g_vm->_filesManager.fn1();
 		}
 	}
 }
 
-void CInputHandler::processMessage(const CMessage &msg) {
-	warning("TODO: CInputHandler::processMessage");
+void CInputHandler::processMessage(const CMessage *msg) {
+	const CMouseMsg *mouseMsg = dynamic_cast<const CMouseMsg *>(msg);
+	_field24 = 0;
+	dispatchMessage(msg);
+
+	if (_field24) {
+		_field24 = 0;
+	} else if (mouseMsg) {
+		// Keep the game state mouse position up to date
+		if (_mousePos != mouseMsg->_mousePos) {
+			_mousePos = mouseMsg->_mousePos;
+			_gameManager->_gameState.setMousePos(mouseMsg->_mousePos);
+		}
+
+		// Set flag for whether a mouse button is currently being pressed
+		if (mouseMsg->isButtonDownMsg())
+			_buttonDown = true;
+		else if (mouseMsg->isButtonUpMsg())
+			_buttonDown = false;
+
+		// Drag events generation
+		if (_dragging) {
+			if (mouseMsg->isMouseMoveMsg()) {
+				if (_dragItem) {
+					CMouseDragMoveMsg moveMsg(_mousePos);
+					moveMsg.execute(_dragItem);
+				}
+			} else {
+				if (mouseMsg->isButtonUpMsg() && _dragItem) {
+					// Mouse drag ended
+					dragEnd(_mousePos, _dragItem);
+					CMouseDragEndMsg endMsg(_mousePos, _dragItem);
+					endMsg.execute(_dragItem);
+				}
+
+				_dragging = false;
+				_dragItem = nullptr;
+			}
+		} else if (_buttonDown) {
+			if (!mouseMsg->isMouseMoveMsg()) {
+				// Save where the drag movement started from
+				_dragStartPos = _mousePos;
+			} else {
+				Common::Point delta = mouseMsg->_mousePos - _dragStartPos;
+				int distance = (int)sqrt(double(delta.x * delta.x + delta.y * delta.y));
+
+				if (distance > 4) {
+					// We've moved far enough with the mouse button held down
+					// to trigger an official dragging operation
+					CMouseDragStartMsg startMsg(_dragStartPos);
+					dispatchMessage(&startMsg);
+
+					// Set the drag item, if any, that a handler will have set on the message
+					_dragItem = startMsg._dragItem;
+					_gameManager->_dragItem = startMsg._dragItem;
+
+					if (_dragItem) {
+						CMouseDragMoveMsg moveMsg(_dragStartPos);
+						dispatchMessage(&moveMsg);
+					}
+
+					_dragging = true;
+				}
+			}
+		}
+	}
+}
+
+void CInputHandler::dispatchMessage(const CMessage *msg) {
+	CPetControl *pet = _gameManager->_project->getPetControl();
+	if (!pet || !msg->execute(pet, nullptr, MSGFLAG_BREAK_IF_HANDLED)) {
+		CViewItem *view = _gameManager->getView();
+		msg->execute(view);
+	}
+}
+
+void CInputHandler::dragEnd(const Common::Point &mousePos, CTreeItem *dragItem) {
+	warning("TODO CInputHandler::dragEnd");
 }
 
 } // End of namespace Titanic z
diff --git a/engines/titanic/input_handler.h b/engines/titanic/input_handler.h
index 461011f63e..ad1ba86215 100644
--- a/engines/titanic/input_handler.h
+++ b/engines/titanic/input_handler.h
@@ -25,6 +25,7 @@
 
 #include "common/rect.h"
 #include "titanic/input_translator.h"
+#include "titanic/core/tree_item.h"
 
 namespace Titanic {
 
@@ -35,15 +36,24 @@ private:
 	/**
 	 * Process and dispatch a passed message
 	 */
-	void processMessage(const CMessage &msg);
+	void processMessage(const CMessage *msg);
+
+	/**
+	 * Dispatches a message to the project
+	 */
+	void dispatchMessage(const CMessage *msg);
+
+	/**
+	 * Called when a drag operation has ended
+	 */
+	void dragEnd(const Common::Point &mousePos, CTreeItem *dragItem);
 public:
 	CGameManager *_gameManager;
 	CInputTranslator *_inputTranslator;
-	int _field4;
-	int _field8;
-	int _fieldC;
-	int _field10;
-	int _field14;
+	bool _dragging;
+	bool _buttonDown;
+	CTreeItem *_dragItem;
+	Common::Point _dragStartPos;
 	Common::Point _mousePos;
 	int _lockCount;
 	int _field24;
diff --git a/engines/titanic/messages/mouse_messages.h b/engines/titanic/messages/mouse_messages.h
index e36b54dcc0..fff392e465 100644
--- a/engines/titanic/messages/mouse_messages.h
+++ b/engines/titanic/messages/mouse_messages.h
@@ -109,11 +109,15 @@ public:
 class CMouseDragMsg : public CMouseMsg {
 public:
 	CLASSDEF
+	CMouseDragMsg() : CMouseMsg() {}
+	CMouseDragMsg(const Common::Point &pt) : CMouseMsg(pt, 0) {}
 };
 
 class CMouseDragMoveMsg : public CMouseDragMsg {
 public:
 	CLASSDEF
+	CMouseDragMoveMsg() : CMouseDragMsg() {}
+	CMouseDragMoveMsg(const Common::Point &pt) : CMouseDragMsg(pt) {}
 
 	virtual bool handleMessage(const CMouseDragMoveMsg &msg) { return false; }
 	virtual bool perform(CTreeItem *treeItem) { 
@@ -125,11 +129,13 @@ public:
 MSGTARGET(CMouseDragStartMsg);
 class CMouseDragStartMsg : public CMouseDragMsg {
 public:
-	int _field10;
+	CTreeItem *_dragItem;
 	int _field14;
 public:
 	CLASSDEF
-	CMouseDragStartMsg() : CMouseDragMsg(), _field10(0), _field14(0) {}
+	CMouseDragStartMsg() : CMouseDragMsg(), _dragItem(nullptr), _field14(0) {}
+	CMouseDragStartMsg(const Common::Point &pt) : CMouseDragMsg(pt),
+		_dragItem(nullptr), _field14(0) {}
 
 	virtual bool handleMessage(const CMouseDragStartMsg &msg) { return false; }
 	virtual bool perform(CTreeItem *treeItem) { 
@@ -141,10 +147,12 @@ public:
 MSGTARGET(CMouseDragEndMsg);
 class CMouseDragEndMsg : public CMouseDragMsg {
 public:
-	int _field10;
+	CTreeItem *_dragItem;
 public:
 	CLASSDEF
-	CMouseDragEndMsg() : CMouseDragMsg(), _field10(0) {}
+	CMouseDragEndMsg() : CMouseDragMsg(), _dragItem(nullptr) {}
+	CMouseDragEndMsg(const Common::Point &pt, CTreeItem *dragItem = nullptr) :
+		CMouseDragMsg(pt), _dragItem(dragItem) {}
 
 	virtual bool handleMessage(const CMouseDragEndMsg &msg) { return false; }
 	virtual bool perform(CTreeItem *treeItem) {