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 * 
 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
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package org.openoffice.accessibility.awb.view;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;



import com.sun.star.accessibility.AccessibleEventObject;
import com.sun.star.accessibility.AccessibleEventId;
import com.sun.star.accessibility.AccessibleStateType;
import com.sun.star.accessibility.XAccessibleContext;
import com.sun.star.accessibility.XAccessibleStateSet;

import org.openoffice.accessibility.misc.NameProvider;

public class StateSetView
    extends ObjectView
{
    /** Create a FocusView when the given object supports the
        XAccessibleComponent interface.
    */
    static public ObjectView Create (
        ObjectViewContainer aContainer,
        XAccessibleContext xContext)
    {
        ObjectView aView = null;
        if (xContext != null)
            aView = new StateSetView (aContainer);
            
        return aView;
    }

    public StateSetView (ObjectViewContainer aContainer)
    {
        super (aContainer);
        setPreferredSize (new Dimension(300,110));
        setMinimumSize (new Dimension(200,80));
    }

    public String GetTitle ()
    {
        return ("StateSet");
    }

    public void notifyEvent (AccessibleEventObject aEvent)
    {
        if (aEvent.EventId == AccessibleEventId.STATE_CHANGED)
            Update();
    }


    public void Update ()
    {
        repaint ();
    }

    public void paintChildren (Graphics g)
    {
        if (g != null)
            synchronized (g)
            {
                super.paintChildren (g);

                // Calculcate the are inside the border.
                Insets aInsets = getInsets ();
                Dimension aSize = getSize();
                Rectangle aWidgetArea = new Rectangle (
                    aInsets.left,
                    aInsets.top,
                    aSize.width-aInsets.left-aInsets.right,
                    aSize.height-aInsets.top-aInsets.bottom);

                PaintAllStates ((Graphics2D)g, aWidgetArea);
            }
    }

    private void PaintAllStates (Graphics2D g, Rectangle aWidgetArea)
    {
        Color aTextColor = g.getColor();

        g.setRenderingHint (
            RenderingHints.KEY_ANTIALIASING, 
            RenderingHints.VALUE_ANTIALIAS_ON);

        XAccessibleStateSet xStateSet = ( mxContext != null ) ? mxContext.getAccessibleStateSet() : null;
        if (xStateSet != null)
        {
            short aStates[] = xStateSet.getStates ();
            final int nMaxStateIndex = AccessibleStateType.VISIBLE;//MANAGES_DESCENDANTS;
            int nStateWidth = (aWidgetArea.width-12) / (nMaxStateIndex+1);
            AffineTransform aTransform = g.getTransform ();
            g.setColor (aTextColor);
            int y = aWidgetArea.y+aWidgetArea.height - 25;
            double nTextRotation = -0.9;//-java.lang.Math.PI/2;
            double nScale = 0.6;

            // Create a shape for the boxes.
            int nBoxWidth = 8;
            Rectangle aCheckBox = new Rectangle (-nBoxWidth/2,0,nBoxWidth,nBoxWidth);

            // For each state draw a box, fill it appropriately, and draw
            // thre states name.
            for (short i=0; i<=nMaxStateIndex; i++)
            {
                int x = nStateWidth + i * nStateWidth;
                String sStateName = NameProvider.getStateName (i);
                if (sStateName == null)
                    sStateName = new String ("<unknown state " + i + ">");
                boolean bStateSet = xStateSet.contains (i);
                g.setTransform (aTransform);
                g.translate (x,y);
                if (bStateSet)
                {
                    switch (i)
                    {
                        case AccessibleStateType.INVALID:
                        case AccessibleStateType.DEFUNC:
                            g.setColor (saInvalidColor);
                            break;
                        case AccessibleStateType.FOCUSED:
                            g.setColor (saFocusColor);
                            break;
                        case AccessibleStateType.SELECTED:
                            g.setColor (saSelectionColor);
                            break;
                        case AccessibleStateType.EDITABLE:
                            g.setColor (saEditColor);
                            break;
                        default:
                            g.setColor (saDefaultColor);
                            break;
                    }
                    g.fill (aCheckBox);
                    g.setColor (aTextColor);
                }
                g.draw (aCheckBox);
                g.rotate (nTextRotation);
                g.scale (nScale, nScale);
                g.translate (2,-2);
                g.drawString (sStateName, 0,0);
            }

            // Draw string of set states.
            String sStates = new String ();
            for (int i=0; i<aStates.length; i++)
            {
                if (i > 0)
                    sStates = sStates + ", ";
                sStates = sStates + NameProvider.getStateName(aStates[i]);
            }
            g.setTransform (aTransform);
            g.translate (10,aWidgetArea.y+aWidgetArea.height-3);
            g.scale (0.9,0.9);
            g.drawString (sStates,0,0);
        }
    }

    static private Color
        saInvalidColor = new Color (255,0,255),
        saFocusColor = new Color (100,100,255),
        saSelectionColor = Color.GREEN,
        saDefaultColor = new Color (90,90,90),
        saEditColor = new Color (240,240,0);
}