--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/javauis/lcdui_akn/javalcdui/javasrc/javax/microedition/lcdui/game/LayerManager.java	Tue Apr 27 16:30:29 2010 +0300
@@ -0,0 +1,160 @@
+/*
+* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+*
+*/
+
+
+package javax.microedition.lcdui.game;
+
+import javax.microedition.lcdui.Graphics;
+
+import java.util.Vector;
+
+public class LayerManager
+{
+    private Vector iLayers;
+    private int iViewX;
+    private int iViewY;
+    private int iViewWidth  = Integer.MAX_VALUE;
+    private int iViewHeight = Integer.MAX_VALUE;
+
+    public LayerManager()
+    {
+        iLayers = new Vector();
+    }
+
+    public void append(Layer aLayer)
+    {
+        remove(aLayer);
+        iLayers.addElement(aLayer);
+    }
+
+    public void insert(Layer aLayer,int aIndex)
+    {
+        if (aLayer == null)
+        {
+            throw new NullPointerException();
+        }
+
+        int indexLimit = iLayers.size();
+        if (aIndex<0 || aIndex>indexLimit)
+        {
+            throw new IndexOutOfBoundsException();
+        }
+
+        indexLimit--;
+        if (aIndex>indexLimit && iLayers.contains(aLayer))
+        {
+            throw new IndexOutOfBoundsException();
+        }
+
+        remove(aLayer);
+        iLayers.insertElementAt(aLayer,aIndex);
+    }
+
+    public void remove(Layer aLayer)
+    {
+        if (aLayer == null)
+        {
+            throw new NullPointerException();
+        }
+        iLayers.removeElement(aLayer);
+    }
+
+    public Layer getLayerAt(int aIndex)
+    {
+        return (Layer)iLayers.elementAt(aIndex);
+    }
+
+    public int getSize()
+    {
+        return iLayers.size();
+    }
+
+
+
+    public void setViewWindow(int aX,int aY,int aWidth,int aHeight)
+    {
+        if (aWidth<0 || aHeight<0)
+        {
+            throw new IllegalArgumentException("Width or height is less than 0");
+        }
+        iViewX=aX;
+        iViewY=aY;
+        iViewWidth=aWidth;
+        iViewHeight=aHeight;
+    }
+
+    public void paint(Graphics aGraphics,int aX,int aY)
+    {
+        // save Graphics clip and translate
+        final int clipX = aGraphics.getClipX();
+        final int clipY = aGraphics.getClipY();
+        final int clipWidth = aGraphics.getClipWidth();
+        final int clipHeight = aGraphics.getClipHeight();
+        final int transX = aGraphics.getTranslateX();
+        final int transY = aGraphics.getTranslateY();
+
+        // intersect Graphics clip region with View Window
+        if ((iViewWidth<Integer.MAX_VALUE) && (iViewWidth<Integer.MAX_VALUE))
+            aGraphics.clipRect(aX,aY,iViewWidth,iViewHeight);
+
+        // translate the graphics object so the point (aX,aY) corresponds to
+        // the location of the viewWindow in the coordinate system of the LayerManager.
+        aGraphics.translate(-iViewX,-iViewY);
+
+        // paint visible Layers
+        final int size = iLayers.size();
+        for (int i=size-1; i>=0; i--)
+        {
+            final Layer layer = getLayerAt(i);
+            if (layerVisible(aGraphics,layer,aX,aY))
+            {
+                aGraphics.translate(aX,aY);
+                layer.paint(aGraphics);
+                aGraphics.translate(-aX,-aY);
+            }
+        }
+
+        // restore Graphics translation
+        // because translation is concatenated, we need to translate back to 0,0 first
+        aGraphics.translate(-aGraphics.getTranslateX(), -aGraphics.getTranslateY());
+        // now back to original translation, per spec
+        aGraphics.translate(transX,transY);
+        // restore Graphics clip - must do after restore translation
+        aGraphics.setClip(clipX,clipY,clipWidth,clipHeight);
+    }
+
+    /**
+     * Check if Layer is visible in Graphics clip region.
+     */
+    private boolean layerVisible(Graphics aGraphics, Layer aLayer, int aX, int aY)
+    {
+        final int clipTlX = aGraphics.getClipX();
+        final int clipTlY = aGraphics.getClipY();
+        final int clipBrX = clipTlX + aGraphics.getClipWidth();
+        final int clipBrY = clipTlY + aGraphics.getClipHeight();
+
+        final int layerTlX = aLayer.getX() + aX;
+        final int layerTlY = aLayer.getY() + aY;
+        final int layerBrX = layerTlX + aLayer.getWidth();
+        final int layerBrY = layerTlY + aLayer.getHeight();
+
+        return(!(clipBrX<=layerTlX || clipBrY<=layerTlY || clipTlX>=layerBrX || clipTlY>=layerBrY));
+    }
+
+}
+
+