scummvm/engines/sherlock/events.cpp

/* 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "common/scummsys.h"
#include "common/events.h"
#include "common/system.h"
#include "engines/util.h"
#include "graphics/cursorman.h"
#include "sherlock/sherlock.h"
#include "sherlock/events.h"

namespace Sherlock {

EventsManager::EventsManager(SherlockEngine *vm) {
	_vm = vm;
	_cursorId = CURSOR_NONE;
	_frameCounter = 1;
	_priorFrameTime = 0;
	_mouseClicked = false;
	_mouseButtons = 0;
}

EventsManager::~EventsManager() {
}

/**
 * Set the cursor to show
 */
void EventsManager::setCursor(CursorType cursorId) {
	_cursorId = cursorId;

	// TODO: Cursor handling
}

/**
 * Show the mouse cursor
 */
void EventsManager::showCursor() {
	CursorMan.showMouse(true);
}

/**
 * Hide the mouse cursor
 */
void EventsManager::hideCursor() {
	CursorMan.showMouse(false);
}

/**
 * Returns true if the mouse cursor is visible
 */
bool EventsManager::isCursorVisible() {
	return CursorMan.isVisible();
}

/**
 * Check for any pending events
 */
void EventsManager::pollEvents() {
	checkForNextFrameCounter();

	Common::Event event;
	while (g_system->getEventManager()->pollEvent(event)) {
		// Handle keypress
		switch (event.type) {
		case Common::EVENT_QUIT:
		case Common::EVENT_RTL:
			return;

		case Common::EVENT_KEYDOWN:
			// Check for debugger
			if (event.kbd.keycode == Common::KEYCODE_d && (event.kbd.flags & Common::KBD_CTRL)) {
				// Attach to the debugger
				_vm->_debugger->attach();
				_vm->_debugger->onFrame();
			} else {
				_pendingKeys.push(event.kbd);
			}
			return;
		case Common::EVENT_KEYUP:
			return;
		case Common::EVENT_LBUTTONDOWN:
		case Common::EVENT_RBUTTONDOWN:
			_mouseClicked = true;
			return;
		case Common::EVENT_LBUTTONUP:
		case Common::EVENT_RBUTTONUP:
			_mouseClicked = false;
			return;
		case Common::EVENT_MOUSEMOVE:
			_mousePos = event.mouse;
			break;
		default:
 			break;
		}
	}
}

/**
 * Poll for events and introduce a small delay, to allow the system to
 * yield to other running programs
 */
void EventsManager::pollEventsAndWait() {
	pollEvents();
	g_system->delayMillis(10);
}

/**
 * Check whether it's time to display the next screen frame
 */
bool EventsManager::checkForNextFrameCounter() {
	// Check for next game frame
	uint32 milli = g_system->getMillis();
	if ((milli - _priorFrameTime) >= GAME_FRAME_TIME) {
		++_frameCounter;
		_priorFrameTime = milli;

		// Give time to the debugger
		_vm->_debugger->onFrame();

		// Display the frame
		_vm->_screen->update();

		// Signal the ScummVM debugger
		_vm->_debugger->onFrame();

		return true;
	}

	return false;
}

/**
 * Clear any current keypress or mouse click
 */
void EventsManager::clearEvents() {
	_pendingKeys.clear();
	_mouseClicked = false;
}

/**
 * Delay for a given number of game frames, where each frame is 1/60th of a second
 */
void EventsManager::wait(int numFrames) {
	uint32 totalMilli = numFrames * 1000 / GAME_FRAME_RATE;
	delay(totalMilli);
}

bool EventsManager::delay(uint32 time, bool interruptable) {
	uint32 delayEnd = g_system->getMillis() + time;

	while (!_vm->shouldQuit() && g_system->getMillis() < delayEnd) {
		pollEventsAndWait();

		if (interruptable && (isKeyPressed() || _mouseClicked)) {
			clearEvents();
			return false;
		}
	}

	return true;
}

/**
 * Wait for the next frame
 */
void EventsManager::waitForNextFrame() {
	_mouseClicked = false;
	_mouseButtons = 0;

	bool mouseClicked = false;
	int mouseButtons = 0;

	uint32 frameCtr = getFrameCounter();
	while (!_vm->shouldQuit() && frameCtr == _frameCounter) {
		pollEventsAndWait();

		mouseClicked |= _mouseClicked;
		mouseButtons |= _mouseButtons;
	}

	_mouseClicked = mouseClicked;
	_mouseButtons = mouseButtons;
}

} // End of namespace MADS