/*
* Copyright (c) 2002-2008 LWJGL Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'LWJGL' nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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*/
package org.lwjgl.opengl;
/**
* An AWT implementation of a LWJGL compatible Mouse event queue.
* @author elias_naur
*/
import java.awt.Component;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import org.lwjgl.input.Mouse;
class MouseEventQueue extends EventQueue implements MouseListener, MouseMotionListener, MouseWheelListener {
private static final int WHEEL_SCALE = 120;
public static final int NUM_BUTTONS = 3;
private final Component component;
private boolean grabbed;
/** The accumulated mouse deltas returned by poll() */
private int accum_dx;
private int accum_dy;
private int accum_dz;
/** The last mouse position */
private int last_x;
private int last_y;
/** Saved control key state for ctrl-click right button emulation */
private boolean saved_control_state;
/** Event scratch array */
private final ByteBuffer event = ByteBuffer.allocate(Mouse.EVENT_SIZE);
/** Buttons array */
private final byte[] buttons = new byte[NUM_BUTTONS];
MouseEventQueue(Component component) {
super(Mouse.EVENT_SIZE);
this.component = component;
}
public synchronized void register() {
resetCursorToCenter();
component.addMouseListener(this);
component.addMouseMotionListener(this);
component.addMouseWheelListener(this);
}
public synchronized void unregister() {
component.removeMouseListener(this);
component.removeMouseMotionListener(this);
component.removeMouseWheelListener(this);
}
protected Component getComponent() {
return component;
}
public synchronized void setGrabbed(boolean grabbed) {
this.grabbed = grabbed;
resetCursorToCenter();
}
public synchronized boolean isGrabbed() {
return grabbed;
}
private int transformY(int y) {
return component.getHeight() - 1 - y;
}
protected void resetCursorToCenter() {
clearEvents();
accum_dx = accum_dy = 0;
Point cursor_location = AWTUtil.getCursorPosition(component);
if (cursor_location != null) {
last_x = cursor_location.x;
last_y = cursor_location.y;
}
}
private void putMouseEvent(byte button, byte state, int dz, long nanos) {
if (grabbed)
putMouseEventWithCoords(button, state, 0, 0, dz, nanos);
else
putMouseEventWithCoords(button, state, last_x, last_y, dz, nanos);
}
protected void putMouseEventWithCoords(byte button, byte state, int coord1, int coord2, int dz, long nanos) {
event.clear();
event.put(button).put(state).putInt(coord1).putInt(coord2).putInt(dz).putLong(nanos);
event.flip();
putEvent(event);
}
public synchronized void poll(IntBuffer coord_buffer, ByteBuffer buttons_buffer) {
if ( grabbed ) {
coord_buffer.put(0, accum_dx);
coord_buffer.put(1, accum_dy);
} else {
coord_buffer.put(0, last_x);
coord_buffer.put(1, last_y);
}
coord_buffer.put(2, accum_dz);
accum_dx = accum_dy = accum_dz = 0;
int old_position = buttons_buffer.position();
buttons_buffer.put(buttons, 0, buttons.length);
buttons_buffer.position(old_position);
}
private void setCursorPos(int x, int y, long nanos) {
y = transformY(y);
if ( grabbed )
return;
int dx = x - last_x;
int dy = y - last_y;
addDelta(dx, dy);
last_x = x;
last_y = y;
putMouseEventWithCoords((byte)-1, (byte)0, x, y, 0, nanos);
}
protected void addDelta(int dx, int dy) {
accum_dx += dx;
accum_dy += dy;
}
public void mouseClicked(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
private void handleButton(MouseEvent e) {
byte state;
switch (e.getID()) {
case MouseEvent.MOUSE_PRESSED:
state = 1;
break;
case MouseEvent.MOUSE_RELEASED:
state = 0;
break;
default:
throw new IllegalArgumentException("Not a valid event ID: " + e.getID());
}
byte button;
switch (e.getButton()) {
case MouseEvent.NOBUTTON:
// Nothing to do, so return
return;
case MouseEvent.BUTTON1:
// Emulate right click if ctrl is down
if (state == 1)
saved_control_state = e.isControlDown();
if (saved_control_state) {
if (buttons[1] == state)
return; // ignore
button = (byte)1;
} else {
button = (byte)0;
}
break;
case MouseEvent.BUTTON2:
button = (byte)2;
break;
case MouseEvent.BUTTON3:
if (buttons[1] == state)
return; // ignore
button = (byte)1;
break;
default:
throw new IllegalArgumentException("Not a valid button: " + e.getButton());
}
setButton(button, state, e.getWhen()*1000000);
}
public synchronized void mousePressed(MouseEvent e) {
handleButton(e);
}
private void setButton(byte button, byte state, long nanos) {
buttons[button] = state;
putMouseEvent(button, state, 0, nanos);
}
public synchronized void mouseReleased(MouseEvent e) {
handleButton(e);
}
private void handleMotion(MouseEvent e) {
if (grabbed) {
updateDeltas(e.getWhen()*1000000);
} else {
setCursorPos(e.getX(), e.getY(), e.getWhen()*1000000);
}
}
public synchronized void mouseDragged(MouseEvent e) {
handleMotion(e);
}
public synchronized void mouseMoved(MouseEvent e) {
handleMotion(e);
}
private void handleWheel(int amount, long nanos) {
accum_dz += amount;
putMouseEvent((byte)-1, (byte)0, amount, nanos);
}
protected void updateDeltas(long nanos) {
}
public synchronized void mouseWheelMoved(MouseWheelEvent e) {
int wheel_amount = -e.getWheelRotation() * WHEEL_SCALE;
handleWheel(wheel_amount, e.getWhen()*1000000);
}
}