Initial commit

engines/ultima/shared/engine/input_handler.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "ultima/shared/engine/input_handler.h"
+#include "ultima/shared/engine/events.h"
+#include "ultima/shared/early/game_base.h"
+#include "ultima/shared/engine/messages.h"
+#include "ultima/shared/gfx/visual_item.h"
+
+namespace Ultima {
+namespace Shared {
+
+InputHandler::InputHandler(GameBase *game) : _game(game), _inputTranslator(nullptr), _dragging(false),
+		_buttonDown(false), _lockCount(0), _abortMessage(false) {
+}
+
+InputHandler::~InputHandler() {
+}
+
+void InputHandler::setTranslator(InputTranslator *translator) {
+	_inputTranslator = translator;
+}
+
+void InputHandler::incLockCount() {
+	++_lockCount;
+}
+
+void InputHandler::decLockCount() {
+	--_lockCount;
+	assert(_lockCount >= 0);
+
+	if (_lockCount == 0 && _inputTranslator) {
+		if (_dragging && !_inputTranslator->isMousePressed()) {
+			CMouseButtonUpMsg upMsg(_mousePos, MK_LBUTTON);
+			handleMessage(upMsg);
+		}
+
+		_buttonDown = _inputTranslator->isMousePressed();
+		_abortMessage = true;
+	}
+}
+
+void InputHandler::handleMessage(CMessage &msg, bool respectLock) {
+	if (!respectLock || _lockCount <= 0) {
+		processMessage(&msg);
+	}
+}
+
+void InputHandler::processMessage(CMessage *msg) {
+	const CMouseMsg *mouseMsg = dynamic_cast<const CMouseMsg *>(msg);
+	_abortMessage = false;
+	dispatchMessage(msg);
+
+	if (_abortMessage) {
+		_abortMessage = false;
+	} else if (mouseMsg) {
+		// Keep the game state mouse position up to date
+		if (_mousePos != mouseMsg->_mousePos) {
+			_mousePos = 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()) {
+				CMouseDragMsg moveMsg(_mousePos, mouseMsg->_buttons);
+				dispatchMessage(&moveMsg);
+			} else if (mouseMsg->isButtonUpMsg()) {
+				_dragging = false;
+			}
+		} else if (_buttonDown) {
+			if (!mouseMsg->isMouseMoveMsg()) {
+				// Save where the drag movement started from
+				_dragStartPos = _mousePos;
+			} else {
+				Point delta = _mousePos - _dragStartPos;
+				int distance = (int)sqrt(double(delta.x * delta.x + delta.y * delta.y));
+
+				if (distance > 4) {
+					// A drag has started
+					_dragging = true;
+				}
+			}
+		}
+	}
+}
+
+void InputHandler::dispatchMessage(CMessage *msg) {
+	Gfx::VisualItem *view = _game->getView();
+	if (view)
+		msg->execute(view);
+}
+
+} // End of namespace Shared
+} // End of namespace Ultima