Import from http://drts.cvs.sourceforge.net/viewvc/drts/projects/jxinput/ tarball

java/de/hardcode/jxinput/event/JXInputEventManager.java

@@ -0,0 +1,284 @@
+//**********************************************************************************************
+//		(C) Copyright 2002 by Dipl. Phys. Joerg Plewe, HARDCODE Development
+//		All rights reserved. Copying, modification,
+//		distribution or publication without the prior written
+//		consent of the author is prohibited.
+//
+//	Created on 31. Januar 2002, 23:42
+//**********************************************************************************************
+package de.hardcode.jxinput.event;
+
+import de.hardcode.jxinput.JXInputManager;
+import de.hardcode.jxinput.JXInputDevice;
+
+import java.util.ArrayList;
+import de.hardcode.jxinput.Axis;
+import java.util.Iterator;
+import de.hardcode.jxinput.Button;
+import de.hardcode.jxinput.Directional;
+
+/**
+ * Handles all events and listeners.
+ * <code>JXInputEventManager</code> is layed out a static singleton.
+ * @author Herkules
+ */
+public class JXInputEventManager
+{
+	
+    private final static ArrayList mAxisEventListeners			= new ArrayList();
+    private final static ArrayList mButtonEventListeners		= new ArrayList();
+    private final static ArrayList mDirectionalEventListeners	= new ArrayList();
+
+	private static autotrigger mAutoTrigger = null;
+	
+    /**
+     * Inner class combining a listener with its scheduling parameters.
+     */
+    private static class axislistener
+    {
+        final JXInputAxisEventListener mListener;
+        final double mTreshold;
+        final JXInputAxisEvent mEvent;
+		double mLastValueFired = 0.0;
+
+		axislistener( JXInputAxisEventListener l, Axis axis, double treshold )
+        {
+            mListener = l;
+            mTreshold = treshold;
+			mEvent = new JXInputAxisEvent( axis );
+        }
+		
+		final void checkTrigger()
+		{
+			double curval = mEvent.getAxis().getValue();
+			double delta = curval - mLastValueFired;
+
+			if ( Math.abs( delta ) >= mTreshold )
+			{
+				mLastValueFired = curval;
+				mEvent.mDelta = delta;
+				mListener.changed( mEvent );
+			}
+		}	
+	}
+	
+    /**
+     * Inner class combining a listener with its scheduling parameters.
+     */
+    private static class buttonlistener
+    {
+        final JXInputButtonEventListener mListener;
+        final JXInputButtonEvent mEvent;
+		boolean mLastValueFired = false;
+
+		buttonlistener( JXInputButtonEventListener l, Button button )
+        {
+            mListener = l;
+			mEvent = new JXInputButtonEvent( button );
+        }
+		
+		final void checkTrigger()
+		{
+			boolean curstate = mEvent.getButton().getState();
+			if ( curstate != mLastValueFired )
+			{
+				mLastValueFired = curstate;
+				mListener.changed( mEvent );
+			}
+		}	
+	}
+	
+
+    private static class directionallistener
+    {
+        final JXInputDirectionalEventListener mListener;
+        final double mValueTreshold;
+        final JXInputDirectionalEvent mEvent;
+		double mLastValueFired = 0.0;
+		boolean mLastCenteredFired = true;
+		int mLastDirectionFired = 0;
+		
+		directionallistener( JXInputDirectionalEventListener l, Directional directional, double valuetreshold )
+        {
+            mListener = l;
+            mValueTreshold = valuetreshold;
+			mEvent = new JXInputDirectionalEvent( directional );
+        }
+		
+		final void checkTrigger()
+		{
+			double	curval				= mEvent.getDirectional().getValue();
+			int		curdir				= mEvent.getDirectional().getDirection();
+			boolean curctr				= mEvent.getDirectional().isCentered();
+			
+			double	delta				= curval - mLastValueFired;
+			int		dirdelta			= curdir - mLastDirectionFired;
+			boolean centeredchanged		= mLastCenteredFired != curctr;
+
+			if ( Math.abs( delta ) >= mValueTreshold 
+				|| Math.abs( dirdelta ) > 0 
+				|| centeredchanged )
+			{
+				mLastValueFired = curval;
+				mLastDirectionFired = curdir;
+				mLastCenteredFired = curctr;
+				
+				mEvent.mValueDelta = delta;
+				mEvent.mDirectionDelta = dirdelta;
+				mListener.changed( mEvent );
+			}
+		}	
+	}
+	
+	/** 
+     * Creates a new instance of JXInputEventManager.
+	 */
+	private JXInputEventManager()
+	{
+	}
+    
+	
+	/**
+	 * Remove all listeners at once.
+	 */
+	public static void reset()
+	{
+		mAxisEventListeners.clear();
+		mButtonEventListeners.clear();
+		mDirectionalEventListeners.clear();
+	}
+	
+	
+    /**
+     * Query devices and fire all occuring events.
+     * <code>trigger()</code> is thought to be called by <code>JXInputManager#updateFeatures()</code>.
+     */
+    public static void trigger()
+    {
+		int n = mAxisEventListeners.size();
+		for ( int i = 0; i < n; i++ )
+		{
+			axislistener l = (axislistener)mAxisEventListeners.get( i );
+			l.checkTrigger();
+		}
+
+		n = mButtonEventListeners.size();
+		for ( int i = 0; i < n; i++ )
+		{
+			buttonlistener l = (buttonlistener)mButtonEventListeners.get( i );
+			l.checkTrigger();
+		}
+
+		n = mDirectionalEventListeners.size();
+		for ( int i = 0; i < n; i++ )
+		{
+			directionallistener l = (directionallistener)mDirectionalEventListeners.get( i );
+			l.checkTrigger();
+		}
+	}
+	
+	
+	private final static class autotrigger extends Thread
+	{
+		boolean mFinish = false;
+		final int mDelay;
+		
+		autotrigger( int delay )
+		{
+			mDelay = delay;
+		}
+		
+		public void run()
+		{
+			while ( ! mFinish )
+			{
+				try
+				{
+					Thread.sleep( mDelay );
+					JXInputManager.updateFeatures();
+				}
+				catch ( InterruptedException ex )
+				{	
+				}
+			}
+		}
+	}
+	
+	
+    /**
+     * Set the intervall in ms that is used to check for new values of the features.
+     * Set it to <= 0 to prohibit automatic triggering. Events will then only be fired
+     * when somebody invokes <code>JXInputManager#updateFeatures()</code>.
+     */
+    public static void setTriggerIntervall( int ms )
+    {
+		//
+		// Kill current thread, if any
+		// 
+		if ( null != mAutoTrigger )
+		{
+			mAutoTrigger.mFinish = true;
+			try
+			{
+				mAutoTrigger.join();
+			}
+			catch ( InterruptedException ex )
+			{	
+			}
+		}
+	
+		mAutoTrigger = null;
+		
+		if ( ms > 0 )
+		{
+			mAutoTrigger = new autotrigger( ms );
+			mAutoTrigger.start();
+		}
+
+	}
+    
+    
+    
+
+    public static void addListener( JXInputAxisEventListener l, Axis axis, double treshold )
+    {
+        mAxisEventListeners.add( new JXInputEventManager.axislistener( l, axis, treshold ) );
+    }
+
+	public static void addListener( JXInputAxisEventListener l, Axis axis )
+    {
+        mAxisEventListeners.add( new JXInputEventManager.axislistener( l, axis, axis.getResolution() ) );
+    }
+
+	public static void removeListener( JXInputAxisEventListener l )
+	{
+		mAxisEventListeners.remove( l );
+	}
+	
+	
+	public static void addListener( JXInputButtonEventListener l, Button button )
+    {
+        mButtonEventListeners.add( new JXInputEventManager.buttonlistener( l, button ) );
+    }
+	
+	public static void removeListener( JXInputButtonEventListener l )
+	{
+		mButtonEventListeners.remove( l );
+	}
+
+	public static void addListener( JXInputDirectionalEventListener l, Directional directional, double valuetreshold )
+    {
+        mDirectionalEventListeners.add( new JXInputEventManager.directionallistener( l, directional, valuetreshold ) );
+    }
+		
+	public static void addListener( JXInputDirectionalEventListener l, Directional directional )
+    {
+        mDirectionalEventListeners.add( new JXInputEventManager.directionallistener( l, directional, directional.getResolution() ) );
+    }
+
+	public static void removeListener( JXInputDirectionalEventListener l )
+	{
+		mDirectionalEventListeners.remove( l );
+	}
+
+}