--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/javauis/lcdui_qt/src/javax/microedition/lcdui/game/LayerManager.java	Tue Aug 31 15:09:22 2010 +0300
@@ -0,0 +1,144 @@
+/*
+* Copyright (c) 2009 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 java.util.Vector;
+
+import javax.microedition.lcdui.Graphics;
+
+/**
+ * LayerManager class.
+ */
+public class LayerManager
+{
+
+    private Vector layers;
+
+    private int viewX;
+    private int viewY;
+
+    private int viewWidth = Integer.MAX_VALUE;
+    private int viewHeight = Integer.MAX_VALUE;
+
+    public LayerManager()
+    {
+        layers = new Vector();
+    }
+
+    public void append(Layer aLayer)
+    {
+        remove(aLayer);
+        layers.addElement(aLayer);
+    }
+
+    public void insert(Layer layer, int index)
+    {
+        if(layer == null)
+        {
+            throw new NullPointerException(
+                MsgRepository.LAYERMANAGER_EXCEPTION_LAYER_NULL);
+        }
+        if(index < 0 || index > layers.size())
+        {
+            throw new IndexOutOfBoundsException(
+                MsgRepository.LAYERMANAGER_EXCEPTION_INVALID_LAYER_INDEX);
+        }
+        if(index > layers.size() - 1 && layers.contains(layer))
+        {
+            throw new IndexOutOfBoundsException(
+                MsgRepository.LAYERMANAGER_EXCEPTION_INVALID_LAYER_INDEX);
+        }
+        remove(layer);
+        layers.insertElementAt(layer, index);
+    }
+
+    public void remove(Layer layer)
+    {
+        if(layer == null)
+        {
+            throw new NullPointerException(
+                MsgRepository.LAYERMANAGER_EXCEPTION_LAYER_NULL);
+        }
+        layers.removeElement(layer);
+    }
+
+    public Layer getLayerAt(int index)
+    {
+        return (Layer) layers.elementAt(index);
+    }
+
+    public int getSize()
+    {
+        return layers.size();
+    }
+
+    public void setViewWindow(int x, int y, int width, int height)
+    {
+        if(width < 0 || height < 0)
+        {
+            throw new IllegalArgumentException(
+                MsgRepository.LAYERMANAGER_EXCEPTION_INVALID_WIDTH_HEIGHT);
+        }
+        viewX = x;
+        viewY = y;
+        viewWidth = width;
+        viewHeight = height;
+    }
+
+    public void paint(Graphics graphics, int x, int y)
+    {
+        // save Graphics clip and translate
+        final int oldClipX = graphics.getClipX();
+        final int oldClipY = graphics.getClipY();
+        final int oldClipW = graphics.getClipWidth();
+        final int oldClipH = graphics.getClipHeight();
+        final int oldTransX = graphics.getTranslateX();
+        final int oldTransY = graphics.getTranslateY();
+
+        // intersect Graphics clip region with View Window
+        graphics.clipRect(x, y, viewWidth, viewHeight);
+        /*
+         * translate the graphics object so the point (aX,aY) corresponds to the
+         * location of the viewWindow in the coordinate system of the
+         * LayerManager.
+         */
+        graphics.translate(-viewX, -viewY);
+
+        // paint visible Layers
+        Layer layer = null;
+        for(int i = layers.size() - 1; i >= 0; i--)
+        {
+            layer = getLayerAt(i);
+            if(layer.isVisible(graphics, x, y))
+            {
+                graphics.translate(x, y);
+                layer.paint(graphics);
+                graphics.translate(-x, -y);
+            }
+        }
+
+        // restore Graphics translation because translation is concatenated
+        // need to translate back to 0,0 first
+        graphics.translate(-graphics.getTranslateX(),
+                           -graphics.getTranslateY());
+
+        // restore Graphics translate and clip
+        graphics.translate(oldTransX, oldTransY);
+        graphics.setClip(oldClipX, oldClipY, oldClipW, oldClipH);
+    }
+
+}