556 lines
15 KiB
Java
556 lines
15 KiB
Java
/*
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* Copyright (c) 2002-2004 Lightweight Java Game Library Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'Light Weight Java Game Library' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.input;
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import java.nio.ByteBuffer;
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import java.util.HashMap;
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import java.util.Map;
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import org.lwjgl.BufferUtils;
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import org.lwjgl.Sys;
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import org.lwjgl.opengl.Window;
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import org.lwjgl.LWJGLErrorException;
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/**
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* $Id$
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* <br>
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* A raw Mouse interface. This can be used to poll the current state of the
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* mouse buttons, and determine the mouse movement delta since the last poll.
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*
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* n buttons supported, n being a native limit. A scrolly wheel is also
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* supported, if one such is available. Movement is reported as delta from
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* last position or as an absolute position. If the window has been created
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* the absolute position will be clamped to 0 - Window (width | height)
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*
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* @author cix_foo <cix_foo@users.sourceforge.net>
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* @author elias_naur <elias_naur@users.sourceforge.net>
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* @author Brian Matzon <brian@matzon.dk>
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* @version $Revision$
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*/
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public class Mouse {
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/** 1 bit transparency for native cursor */
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public final static int CURSOR_ONE_BIT_TRANSPARENCY = 1;
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/** 8 bit alhpa native cursor */
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public final static int CURSOR_8_BIT_ALPHA = 2;
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/** animation native cursor */
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public final static int CURSOR_ANIMATION = 4;
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/** Has the mouse been created? */
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private static boolean created;
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/** The mouse buttons status from the last poll */
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private static byte[] buttons;
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/** X */
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private static int x;
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/** Y */
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private static int y;
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/** Delta X */
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private static int dx;
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/** Delta Y */
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private static int dy;
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/** Delta Z */
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private static int dwheel;
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/** Number of buttons supported by the mouse */
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private static int buttonCount = -1;
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/** Does this mouse support a scroll wheel */
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private static boolean hasWheel = false;
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/** The current native cursor, if any */
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private static Cursor currentCursor;
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/** Button names. These are set upon create(), to names like BUTTON0, BUTTON1, etc. */
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private static String[] buttonName;
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/** hashmap of button names, for fast lookup */
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private static final Map buttonMap = new HashMap(16);
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/** Lazy initialization */
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private static boolean initialized;
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/** The mouse button events from the last read */
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private static ByteBuffer readBuffer = null;
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/** The current mouse event button being examined */
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private static int eventButton;
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/** The current state of the button being examined in the event queue */
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private static boolean eventState;
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/** Buffer size in events */
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private final static int BUFFER_SIZE = 50;
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/**
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* Mouse cannot be constructed.
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*/
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private Mouse() {
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}
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/**
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* Gets the currently bound native cursor, if any.
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*
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* @return the currently bound native cursor, if any.
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*/
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public static Cursor getNativeCursor() {
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return currentCursor;
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}
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/**
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* Get the capabilities of the native cursor. Return a bit mask of the native cursor capabilities.
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* The CURSOR_ONE_BIT_TRANSPARANCY indicates support for cursors with one bit transparancy,
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* the CURSOR_8_BIT_ALPHA indicates support for 8 bit alpha and CURSOR_ANIMATION indicates
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* support for cursor animations.
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*
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* @return A bit mask with native cursor capabilities.
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*/
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public static int getNativeCursorCaps() {
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return nGetNativeCursorCaps();
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}
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/**
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* Native function to determine native cursor support
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*/
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private static native int nGetNativeCursorCaps();
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/**
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* Binds a native cursor. If the cursor argument is null, the
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* native cursor is disabled, as if native cursors were not supported.
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* The Mouse must be created before a native cursor can be bound.
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*
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* NOTE: The native cursor is not constrained to the window, but
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* relative events will not be generated if the cursor is outside.
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* The initial position of the cursor is the middle of the window,
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* that is, {window_width/2, window_height/2}.
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* The cursor will be moved to this origin when a
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* native cursor is set and the previous cursor is null.
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*
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* @param cursor the native cursor object to bind. May be null.
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* @return The previous Cursor object set, or null.
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* @throws LWJGLErrorException if the cursor could not be set for any reason
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*/
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public static Cursor setNativeCursor(Cursor cursor) throws LWJGLErrorException {
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if (!created)
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throw new IllegalStateException("Create the Mouse before setting the native cursor");
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if ((getNativeCursorCaps() & CURSOR_ONE_BIT_TRANSPARENCY) == 0)
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throw new IllegalStateException("Mouse doesn't support native cursors");
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Cursor oldCursor = currentCursor;
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currentCursor = cursor;
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if (currentCursor != null) {
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nSetNativeCursor(currentCursor.getHandle());
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currentCursor.setTimeout();
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} else {
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nSetNativeCursor(0);
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}
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return oldCursor;
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}
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/** Native method to set the native cursor */
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private static native void nSetNativeCursor(long handle) throws LWJGLErrorException;
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/**
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* Gets the minimum size of a native cursor. Can only be called if
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* The Mouse is created and cursor caps includes at least
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* CURSOR_ONE_BIT_TRANSPARANCY.
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*
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* @return the maximum size of a native cursor
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*/
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public static int getMinCursorSize() {
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return nGetMinCursorSize();
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}
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/** Native method returning the minimum cursor size */
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private static native int nGetMinCursorSize();
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/**
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* Gets the maximum size of a native cursor. Can only be called if
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* The Mouse is created and cursor caps includes at least
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* CURSOR_ONE_BIT_TRANSPARANCY.
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*
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* @return the maximum size of a native cursor
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*/
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public static int getMaxCursorSize() {
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return nGetMaxCursorSize();
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}
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/** Native method returning the maximum cursor size */
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private static native int nGetMaxCursorSize();
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/**
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* Static initialization
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*/
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private static void initialize() {
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Sys.initialize();
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initIDs();
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// Assign names to all the buttons
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buttonName = new String[16];
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for (int i = 0; i < 16; i ++) {
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buttonName[i] = "BUTTON" + i;
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buttonMap.put(buttonName[i], new Integer(i));
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}
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initialized = true;
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}
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/**
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* Register fields with the native library
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*/
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private static native void initIDs();
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/**
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* "Create" the mouse. The display must first have been created.
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*
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* @throws LWJGLErrorException if the mouse could not be created for any reason
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*/
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public static void create() throws LWJGLErrorException {
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if (!Window.isCreated())
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throw new IllegalStateException("Window must be created prior to creating mouse");
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initialize();
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if (created) {
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return;
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}
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nCreate();
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hasWheel = nHasWheel();
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created = true;
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currentCursor = null;
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// set mouse buttons
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buttonCount = nGetButtonCount();
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buttons = new byte[buttonCount];
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}
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/** Native query of wheel support */
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private static native boolean nHasWheel();
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/** Native query of button count */
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private static native int nGetButtonCount();
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/**
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* Native method to create the mouse.
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*
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* @return true if the mouse was created
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*/
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private static native void nCreate();
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/**
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* @return true if the mouse has been created
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*/
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public static boolean isCreated() {
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return created;
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}
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/**
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* @return true if buffering is enabled
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*/
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public static boolean isBuffered() {
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return readBuffer != null;
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}
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/**
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* "Destroy" the mouse.
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*/
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public static void destroy() {
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if (currentCursor != null) {
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try {
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setNativeCursor(null);
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} catch (LWJGLErrorException e) {
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if (Sys.DEBUG)
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e.printStackTrace();
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}
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}
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if (!created)
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return;
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created = false;
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buttons = null;
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currentCursor = null;
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nDestroy();
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}
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/**
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* Native method the destroy the mouse
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*/
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private static native void nDestroy();
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/**
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* Polls the mouse for its current state. Access the polled values using the
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* get<value> methods.
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* By using this method, it is possible to "miss" mouse click events if you don't
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* poll fast enough. To receive all button events, enable buffering by calling
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* <code>enableBuffer</code>, and read those events by calling <code>read</code>
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*
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* @see org.lwjgl.input.Mouse#isButtonDown(int button)
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* @see org.lwjgl.input.Mouse#getX()
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* @see org.lwjgl.input.Mouse#getY()
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* @see org.lwjgl.input.Mouse#getDX()
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* @see org.lwjgl.input.Mouse#getDY()
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* @see org.lwjgl.input.Mouse#getDWheel()
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* @see org.lwjgl.input.Mouse#enableBuffer()
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* @see org.lwjgl.input.Mouse#read()
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*/
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public static void poll() {
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if (!created)
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throw new IllegalStateException("Mouse must be created before you can poll it");
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nPoll();
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// set absolute position
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x += dx;
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y += dy;
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// if window has been created, clamp to edges
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if(Window.isCreated()) {
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// clamp x, y
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if (x < 0) {
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x = 0;
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} else if (x > Window.getWidth()) {
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x = Window.getWidth();
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}
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if (y < 0) {
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y = 0;
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} else if (y > Window.getHeight()) {
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y = Window.getHeight();
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}
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}
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}
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/**
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* Native method to poll the mouse
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*/
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private static native void nPoll();
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/**
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* See if a particular mouse button is down.
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*
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* @param button The index of the button you wish to test (0..getButtonCount-1)
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* @return true if the specified button is down
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*/
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public static boolean isButtonDown(int button) {
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if (!created)
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throw new IllegalStateException("Mouse must be created before you can poll the button state");
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if (button >= buttonCount || button < 0)
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return false;
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else
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return buttons[button] == 1;
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}
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/**
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* Gets a button's name
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* @param button The button
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* @return a String with the button's human readable name in it or null if the button is unnamed
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*/
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public static String getButtonName(int button) {
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if (button >= buttonName.length || button < 0)
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return null;
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else
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return buttonName[button];
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}
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/**
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* Get's a button's index. If the button is unrecognised then -1 is returned.
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* @param buttonName The button name
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*/
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public static int getButtonIndex(String buttonName) {
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Integer ret = (Integer) buttonMap.get(buttonName);
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if (ret == null)
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return -1;
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else
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return ret.intValue();
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}
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/**
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* Enable mouse button buffering. Must be called after the mouse is created.
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*/
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public static void enableBuffer() throws LWJGLErrorException {
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if (!created)
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throw new IllegalStateException("Mouse must be created before you can enable buffering");
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readBuffer = BufferUtils.createByteBuffer(2*BUFFER_SIZE);
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readBuffer.limit(0);
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nEnableBuffer();
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}
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/**
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* Native method to enable the buffer
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* @return the event buffer,
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* or null if no buffer can be allocated
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*/
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private static native void nEnableBuffer() throws LWJGLErrorException;
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/**
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* Reads all button events since last read.
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* To use these values, you have to call <code>next</code> for each event you
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* want to read. You can query which button caused the event by using
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* <code>getEventButton</code>. To get the state of that button, for that event, use
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* <code>getEventButtonState</code>.
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*
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* @see org.lwjgl.input.Mouse#next()
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* @see org.lwjgl.input.Mouse#enableBuffer()
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* @see org.lwjgl.input.Mouse#getEventButton()
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* @see org.lwjgl.input.Mouse#getEventButtonState()
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*/
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public static void read() {
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if (!created)
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throw new IllegalStateException("Mouse must be created before you can read events");
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if (readBuffer == null)
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throw new IllegalStateException("Event buffering must be enabled before you can read events");
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readBuffer.compact();
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int numEvents = nRead(readBuffer, readBuffer.position());
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readBuffer.position(readBuffer.position() + numEvents*2);
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readBuffer.flip();
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}
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/**
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* Native method to read the keyboard buffer
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* @return the total number of events read.
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*/
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private static native int nRead(ByteBuffer buffer, int buffer_position);
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/**
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* Gets the next mouse event. You can query which button caused the event by using
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* <code>getEventButton()</code>. To get the state of that key, for that event, use
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* <code>getEventButtonState</code>.
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* @see org.lwjgl.input.Mouse#getEventButton()
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* @see org.lwjgl.input.Mouse#getEventButtonState()
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* @return true if a mouse event was read, false otherwise
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*/
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public static boolean next() {
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if (!created)
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throw new IllegalStateException("Mouse must be created before you can read events");
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if (readBuffer == null)
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throw new IllegalStateException("Event buffering must be enabled before you can read events");
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if (readBuffer.hasRemaining()) {
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eventButton = readBuffer.get() & 0xFF;
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eventState = readBuffer.get() != 0;
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return true;
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} else
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return false;
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}
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/**
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* @return Current events button
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*/
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public static int getEventButton() {
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return eventButton;
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}
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/**
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* @return Current events button state
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*/
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public static boolean getEventButtonState() {
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return eventState;
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}
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/**
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* Retrieves the absolute position. If the Window has been created
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* x will be clamped to 0 - Window.getWidth().
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*
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* @return Absolute x axis position of mouse
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*/
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public static int getX() {
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return x;
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}
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/**
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* Retrieves the absolute position. If the Window has been created
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* y will be clamped to 0 - Window.getHeight().
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*
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* @return Absolute y axis position of mouse
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*/
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public static int getY() {
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return y;
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}
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/**
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* @return Movement on the x axis since last poll
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*/
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public static int getDX() {
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return dx;
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}
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/**
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* @return Movement on the y axis since last poll
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*/
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public static int getDY() {
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return dy;
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}
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/**
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* @return Movement of the wheel since last poll
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*/
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public static int getDWheel() {
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return dwheel;
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}
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/**
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* @return Number of buttons on this mouse
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*/
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public static int getButtonCount() {
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return buttonCount;
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}
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/**
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* @return Whether or not this mouse has wheel support
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*/
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public static boolean hasWheel() {
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return hasWheel;
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}
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/**
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* Updates the cursor, so that animation can be changed if needed.
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* This method is called automatically by the window on its update.
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*/
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public static void updateCursor() {
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if(currentCursor != null && currentCursor.hasTimedOut()) {
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currentCursor.nextCursor();
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try {
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setNativeCursor(currentCursor);
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} catch (LWJGLErrorException e) {
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if (Sys.DEBUG)
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e.printStackTrace();
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}
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}
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}
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}
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