/*
* 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;

import org.eclipse.swt.graphics.Point;

/**
 * Item representing a Choice group.
 */
public class ChoiceGroup extends Item implements Choice {

    private ChoiceImpl choiceImpl;
    private int type;

    /**
     * Constructor.
     *
     * @param label the label
     * @param type the type
     */
    public ChoiceGroup(String label, int type) {
        this(label, type, new String[] {}, null);
    }

    /**
     * Constructor.
     *
     * @param label the label
     * @param type the type
     * @param textElements text elements
     * @param imgElements image elements
     *
     * @throws IllegalArgumentException if type is invalid
     * @throws IllegalArgumentException if image elements array is not null and
     *             the length of the arrays don't match
     * @throws NullPointerException if the text elements array is null
     * @throws NullPointerException if any of the text elements is null
     */
    public ChoiceGroup(String label, int type,
            String[] textElements,
            Image[] imgElements) {
        switch (type) {
            case Choice.EXCLUSIVE:
            case Choice.POPUP:
                choiceImpl = new ChoiceImpl(false);
                break;
            case Choice.MULTIPLE:
                choiceImpl = new ChoiceImpl(true);
                break;
            default:
                throw new IllegalArgumentException(
                        MsgRepository.CHOICEGROUP_EXCEPTION_INVALID_TYPE);
        }
        choiceImpl.check(textElements, imgElements);
        setLabel(label != null ? label : "");
        this.type = type;
        // append elements
        for (int i = 0; i < textElements.length; i++) {
            append(textElements[i], imgElements != null
                    ? imgElements[i] : null);
        }
    }

    /**
     * Append item with specified text and image.
     *
     * @param text the text
     * @param img the image
     * @return index of added item
     */
    public int append(String text, Image img) {
        int ret = choiceImpl.append(text, img);
        updateParent(UPDATE_SIZE_CHANGED);
        return ret;
    }

    /**
     * Insert item with specified text and image.
     *
     * @param position the item index
     * @param text the text
     * @param img the image
     */
    public void insert(int position, String text, Image img) {
        choiceImpl.insert(position, text, img);
        updateParent(UPDATE_SIZE_CHANGED);
    }

    /**
     * Set item with specified text and image.
     *
     * @param position the item index
     * @param text the text
     * @param img the image
     */
    public void set(int position, String text, Image img) {
        choiceImpl.set(position, text, img);
        updateParent(UPDATE_CONTENT);
    }

    /**
     * Remove item at specified position.
     *
     * @param position the item index
     */
    public void delete(int position) {
        choiceImpl.delete(position);
        updateParent(UPDATE_SIZE_CHANGED);
    }

    /**
     * Remove all items.
     */
    public void deleteAll() {
        choiceImpl.deleteAll();
        updateParent(UPDATE_SIZE_CHANGED);
    }

    /**
     * Get the fit policy of this ChoiceGroup.
     *
     * @return the ChoiceGroup's fit policy
     */
    public int getFitPolicy() {
        return choiceImpl.getFitPolicy();
    }

    /**
     * Get the font used in a ChoiceGroup item.
     *
     * @param position the index of the item
     * @return the items font
     */
    public Font getFont(int position) {
        return choiceImpl.getFont(position);
    }

    /**
     * Get the image part of a ChoiceGroup item.
     *
     * @param position the index of the item
     * @return the items image part
     */
    public Image getImage(int position) {
        return choiceImpl.getImage(position);
    }

    /**
     * Get the string part of a ChoiceGroup item.
     *
     * @param position the index of the item
     * @return the items string part
     */
    public String getString(int position) {
        return choiceImpl.getString(position);
    }

    /**
     * Get selected flags.
     *
     * @param selectedArray an array with selected items
     * @return selected flags
     */
    public int getSelectedFlags(boolean[] selectedArray) {
        return choiceImpl.getSelectedFlags(selectedArray);
    }

    /**
     * Returns the selected item's index.
     *
     * @return the selected index
     */
    public int getSelectedIndex() {
        return choiceImpl.getSelectedIndex();
    }

    /**
     * Returns if the specified element is selected.
     *
     * @param position specified element index
     * @return true if its selected, false otherwise
     */
    public boolean isSelected(int position) {
        return choiceImpl.isSelected(position);
    }

    /**
     * Set the fit policy of this ChoiceGroup.
     *
     * @param newFitPolicy the new fit policy
     */
    public void setFitPolicy(int newFitPolicy) {
        choiceImpl.setFitPolicy(newFitPolicy);
        updateParent(UPDATE_SIZE_CHANGED);
    }

    /**
     * Set the font of a ChoiceGroup item.
     *
     * @param position the index of the item
     * @param font the desired font
     */
    public void setFont(int position, Font font) {
        choiceImpl.setFont(position, font);
        updateParent(UPDATE_SIZE_CHANGED);
    }

    /**
     * Set selected flags.
     *
     * @param selectedArray an array with selected items
     */
    public void setSelectedFlags(boolean[] selectedArray) {
        choiceImpl.setSelectedFlags(selectedArray);
        updateParent(UPDATE_CONTENT);
    }

    /**
     * Set selected index.
     *
     * @param position the index of the item
     * @param select selected or not
     */
    public void setSelectedIndex(int position, boolean select) {
        choiceImpl.setSelected(position, select);
        updateParent(UPDATE_CONTENT);
    }

    /**
     * Returns the size of the ChoiceGroup.
     *
     * @return the lists size
     */
    public int size() {
        return choiceImpl.size();
    }

    /**
     * Calculates minimum size of this item.
     *
     * @return Minimum size.
     */
    Point calculateMinimumSize() {
        return ChoiceGroupLayouter.calculateMinimumBounds(this);
    }

    /**
     * Calculates preferred size of this item.
     *
     * @return Preferred size.
     */
    Point calculatePreferredSize() {
        return ChoiceGroupLayouter.calculatePreferredBounds(this);
    }

    /**
     * Called by widget listeners to update Item value.
     */
    void internalSetSelectedIndex(int position, boolean select) {
        choiceImpl.setSelected(position, select);
        // notify item state listener
        notifyStateChanged();
    }

    /**
     * Return layout with optional custom flags.
     *
     * @return layout directive
     */
    int internalGetLayout() {
        return super.internalGetLayout() | Item.LAYOUT_NEWLINE_BEFORE;
    }

    /**
     * Return the ChoiceGroup type.
     */
    final int getType() {
        return type;
    }

    /* (non-Javadoc)
     * @see javax.microedition.lcdui.Item#isFocusable()
     */
    boolean isFocusable() {
        return true;
    }

}