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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file 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 specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pivot.wtk;

import java.io.IOException;
import java.net.URL;
import java.util.Comparator;

import org.apache.pivot.beans.DefaultProperty;
import org.apache.pivot.collections.ArrayList;
import org.apache.pivot.collections.List;
import org.apache.pivot.collections.ListListener;
import org.apache.pivot.collections.Map;
import org.apache.pivot.collections.Sequence;
import org.apache.pivot.collections.immutable.ImmutableList;
import org.apache.pivot.json.JSON;
import org.apache.pivot.json.JSONSerializer;
import org.apache.pivot.serialization.SerializationException;
import org.apache.pivot.util.Filter;
import org.apache.pivot.util.ListenerList;
import org.apache.pivot.wtk.content.ListViewItemRenderer;

/**
 * Component that displays a sequence of items, optionally allowing a user
 * to select or check one or more items.
 */
@DefaultProperty("listData")
public class ListView extends Component {
    /**
     * Enumeration defining supported selection modes.
     */
    public enum SelectMode {
        /**
         * Selection is disabled.
         */
        NONE,

        /**
         * A single index may be selected at a time.
         */
        SINGLE,

        /**
         * Multiple indexes may be concurrently selected.
         */
        MULTI
    }

    /**
     * {@link Renderer} interface to customize the appearance of items in a ListView.
     */
    public interface ItemRenderer extends Renderer {
        /**
         * Prepares the renderer for layout or paint.
         *
         * @param item
         * The item to render, or null if called to calculate preferred
         * height for skins that assume a fixed renderer height.
         *
         * @param index
         * The index of the item being rendered, or -1 if item
         * is null.
         *
         * @param listView
         * The host component.
         *
         * @param selected
         * If true, the item is selected.
         * the item.
         *
         * @param checked
         * If true, the item is checked.
         *
         * @param highlighted
         * If true, the item is highlighted.
         *
         * @param disabled
         * If true, the item is disabled.
         */
        public void render(Object item, int index, ListView listView, boolean selected,
            boolean checked, boolean highlighted, boolean disabled);

        /**
         * Converts a list item to a string representation.
         *
         * @param item
         *
         * @return
         * The item's string representation, or null if the item does not
         * have a string representation.
         * 

         * Note that this method may be called often during keyboard navigation, so
         * implementations should avoid unnecessary string allocations.
         */
        public String toString(Object item);
    }

    /**
     * List view item editor interface.
     */
    public interface ItemEditor {
        /**
         * Called to begin editing a list item.
         *
         * @param listView
         * @param itemIndex
         */
        public void beginEdit(ListView listView, int itemIndex);

        /**
         * Terminates an edit operation.
         *
         * @param result
         * true to perform the edit; false to cancel it.
         */
        public void endEdit(boolean result);

        /**
         * Tests whether an edit is currently in progress.
         */
        public boolean isEditing();
    }

    /**
     * List view skin interface. List view skins are required to implement
     * this.
     */
    public interface Skin {
        public int getItemAt(int y);
        public Bounds getItemBounds(int index);
        public int getItemIndent();
    }

    /**
     * Translates between list and bind context data during data binding.
     */
    public interface ListDataBindMapping {
        /**
         * Converts a context value to list data during a
         * {@link Component#load(Object)} operation.
         *
         * @param value
         */
        public List toListData(Object value);

        /**
         * Converts list data to a context value during a
         * {@link Component#store(Object)} operation.
         *
         * @param listData
         */
        public Object valueOf(List listData);
    }

    /**
     * Translates between item position and bind context data during data binding.
     */
    public interface ItemBindMapping {
        /**
         * Returns the index of the item in the source list during a
         * {@link Component#load(Object)} operation.
         *
         * @param listData
         * The source list data.
         *
         * @param value
         * The value to locate.
         *
         * @return
         * The index of first occurrence of the value if it exists in the list;
         * -1, otherwise.
         */
        public int indexOf(List listData, Object value);

        /**
         * Retrieves the value at the given index during a
         * {@link Component#store(Object)} operation.
         *
         * @param listData
         * The source list data.
         *
         * @param index
         * The index of the value to retrieve.
         */
        public Object get(List listData, int index);
    }

    private static class ListViewListenerList extends WTKListenerList
        implements ListViewListener {
        @Override
        public void listDataChanged(ListView listView, List previousListData) {
            for (ListViewListener listener : this) {
                listener.listDataChanged(listView, previousListData);
            }
        }

        @Override
        public void itemRendererChanged(ListView listView,
            ListView.ItemRenderer previousItemRenderer) {
            for (ListViewListener listener : this) {
                listener.itemRendererChanged(listView, previousItemRenderer);
            }
        }

        @Override
        public void itemEditorChanged(ListView listView,
            ListView.ItemEditor previousItemEditor) {
            for (ListViewListener listener : this) {
                listener.itemEditorChanged(listView, previousItemEditor);
            }
        }

        @Override
        public void selectModeChanged(ListView listView,
            ListView.SelectMode previousSelectMode) {
            for (ListViewListener listener : this) {
                listener.selectModeChanged(listView, previousSelectMode);
            }
        }

        @Override
        public void checkmarksEnabledChanged(ListView listView) {
            for (ListViewListener listener : this) {
                listener.checkmarksEnabledChanged(listView);
            }
        }

        @Override
        public void disabledItemFilterChanged(ListView listView,
            Filter previousDisabledItemFilter) {
            for (ListViewListener listener : this) {
                listener.disabledItemFilterChanged(listView, previousDisabledItemFilter);
            }
        }

        @Override
        public void disabledCheckmarkFilterChanged(ListView listView,
            Filter previousDisabledCheckmarkFilter) {
            for (ListViewListener listener : this) {
                listener.disabledCheckmarkFilterChanged(listView, previousDisabledCheckmarkFilter);
            }
        }
    }

    private static class ListViewItemListenerList extends WTKListenerList
        implements ListViewItemListener {
        @Override
        public void itemInserted(ListView listView, int index) {
            for (ListViewItemListener listener : this) {
                listener.itemInserted(listView, index);
            }
        }

        @Override
        public void itemsRemoved(ListView listView, int index, int count) {
            for (ListViewItemListener listener : this) {
                listener.itemsRemoved(listView, index, count);
            }
        }

        @Override
        public void itemUpdated(ListView listView, int index) {
            for (ListViewItemListener listener : this) {
                listener.itemUpdated(listView, index);
            }
        }

        @Override
        public void itemsCleared(ListView listView) {
            for (ListViewItemListener listener : this) {
                listener.itemsCleared(listView);
            }
        }

        @Override
        public void itemsSorted(ListView listView) {
            for (ListViewItemListener listener : this) {
                listener.itemsSorted(listView);
            }
        }
    }

    private static class ListViewItemStateListenerList extends WTKListenerList
        implements ListViewItemStateListener {
        @Override
        public void itemCheckedChanged(ListView listView, int index) {
            for (ListViewItemStateListener listener : this) {
                listener.itemCheckedChanged(listView, index);
            }
        }
    }

    private static class ListViewSelectionListenerList extends WTKListenerList
        implements ListViewSelectionListener {
        @Override
        public void selectedRangeAdded(ListView listView, int rangeStart, int rangeEnd) {
            for (ListViewSelectionListener listener : this) {
                listener.selectedRangeAdded(listView, rangeStart, rangeEnd);
            }
        }

        @Override
        public void selectedRangeRemoved(ListView listView, int rangeStart, int rangeEnd) {
            for (ListViewSelectionListener listener : this) {
                listener.selectedRangeRemoved(listView, rangeStart, rangeEnd);
            }
        }

        @Override
        public void selectedRangesChanged(ListView listView, Sequence previousSelection) {
            for (ListViewSelectionListener listener : this) {
                listener.selectedRangesChanged(listView, previousSelection);
            }
        }

        @Override
        public void selectedItemChanged(ListView listView, Object previousSelectedItem) {
            for (ListViewSelectionListener listener : this) {
                listener.selectedItemChanged(listView, previousSelectedItem);
            }
        }
    }

    private static class ListViewBindingListenerList extends WTKListenerList
        implements ListViewBindingListener {
        @Override
        public void listDataKeyChanged(ListView listView, String previousListDataKey) {
            for (ListViewBindingListener listener : this) {
                listener.listDataKeyChanged(listView, previousListDataKey);
            }
        }

        @Override
        public void listDataBindTypeChanged(ListView listView, BindType previousListDataBindType) {
            for (ListViewBindingListener listener : this) {
                listener.listDataBindTypeChanged(listView, previousListDataBindType);
            }
        }

        @Override
        public void listDataBindMappingChanged(ListView listView,
            ListView.ListDataBindMapping previousListDataBindMapping) {
            for (ListViewBindingListener listener : this) {
                listener.listDataBindMappingChanged(listView, previousListDataBindMapping);
            }
        }

        @Override
        public void selectedItemKeyChanged(ListView listView, String previousSelectedItemKey) {
            for (ListViewBindingListener listener : this) {
                listener.selectedItemKeyChanged(listView, previousSelectedItemKey);
            }
        }

        @Override
        public void selectedItemBindTypeChanged(ListView listView, BindType previousSelectedItemBindType) {
            for (ListViewBindingListener listener : this) {
                listener.selectedItemBindTypeChanged(listView, previousSelectedItemBindType);
            }
        }

        @Override
        public void selectedItemBindMappingChanged(ListView listView,
            ItemBindMapping previousSelectedItemBindMapping) {
            for (ListViewBindingListener listener : this) {
                listener.selectedItemBindMappingChanged(listView, previousSelectedItemBindMapping);
            }
        }

        @Override
        public void selectedItemsKeyChanged(ListView listView, String previousSelectedItemsKey) {
            for (ListViewBindingListener listener : this) {
                listener.selectedItemsKeyChanged(listView, previousSelectedItemsKey);
            }
        }

        @Override
        public void selectedItemsBindTypeChanged(ListView listView, BindType previousSelectedItemsBindType) {
            for (ListViewBindingListener listener : this) {
                listener.selectedItemsBindTypeChanged(listView, previousSelectedItemsBindType);
            }
        }

        @Override
        public void selectedItemsBindMappingChanged(ListView listView,
            ItemBindMapping previousSelectedItemsBindMapping) {
            for (ListViewBindingListener listener : this) {
                listener.selectedItemsBindMappingChanged(listView, previousSelectedItemsBindMapping);
            }
        }

        @Override
        public void checkedItemsKeyChanged(ListView listView, String previousCheckedItemsKey) {
            for (ListViewBindingListener listener : this) {
                listener.checkedItemsKeyChanged(listView, previousCheckedItemsKey);
            }
        }

        @Override
        public void checkedItemsBindTypeChanged(ListView listView, BindType previousCheckedItemsBindType) {
            for (ListViewBindingListener listener : this) {
                listener.checkedItemsBindTypeChanged(listView, previousCheckedItemsBindType);
            }
        }

        @Override
        public void checkedItemsBindMappingChanged(ListView listView,
            ListView.ItemBindMapping previousCheckedItemsBindMapping) {
            for (ListViewBindingListener listener : this) {
                listener.checkedItemsBindMappingChanged(listView, previousCheckedItemsBindMapping);
            }
        }
    }

    private List listData = null;

    private ItemRenderer itemRenderer = null;
    private ItemEditor itemEditor = null;

    private RangeSelection rangeSelection = new RangeSelection();
    private SelectMode selectMode = SelectMode.SINGLE;

    private boolean checkmarksEnabled = false;
    private ArrayList checkedIndexes = new ArrayList();

    private Filter disabledItemFilter = null;
    private Filter disabledCheckmarkFilter = null;

    private String listDataKey = null;
    private BindType listDataBindType = BindType.BOTH;
    private ListDataBindMapping listDataBindMapping = null;

    private String selectedItemKey = null;
    private BindType selectedItemBindType = BindType.BOTH;
    private ItemBindMapping selectedItemBindMapping = null;

    private String selectedItemsKey = null;
    private BindType selectedItemsBindType = BindType.BOTH;
    private ItemBindMapping selectedItemsBindMapping = null;

    private String checkedItemsKey = null;
    private BindType checkedItemsBindType = BindType.BOTH;
    private ItemBindMapping checkedItemsBindMapping = null;

    private ListListener listDataListener = new ListListener() {
        @Override
        public void itemInserted(List list, int index) {
            // Increment selected ranges
            int updated = rangeSelection.insertIndex(index);

            // Increment checked indexes
            int i = ArrayList.binarySearch(checkedIndexes, index);
            if (i < 0) {
                i = -(i + 1);
            }

            int n = checkedIndexes.getLength();
            while (i < n) {
                checkedIndexes.update(i, checkedIndexes.get(i) + 1);
                i++;
            }

            // Notify listeners that items were inserted
            listViewItemListeners.itemInserted(ListView.this, index);

            if (updated > 0) {
                listViewSelectionListeners.selectedRangesChanged(ListView.this, getSelectedRanges());
            }
        }

        @Override
        public void itemsRemoved(List list, int index, Sequence items) {
            int count = items.getLength();

            int previousSelectedIndex;
            if (selectMode == SelectMode.SINGLE
                && rangeSelection.getLength() > 0) {
                previousSelectedIndex = rangeSelection.get(0).start;
            } else {
                previousSelectedIndex = -1;
            }

            // Decrement selected ranges
            int updated = rangeSelection.removeIndexes(index, count);

            // Remove and decrement checked indexes
            int i = ArrayList.binarySearch(checkedIndexes, index);
            if (i < 0) {
                i = -(i + 1);
            }

            int j = ArrayList.binarySearch(checkedIndexes, index + count - 1);
            if (j < 0) {
                j = -(j + 1);
            } else {
                j++;
            }

            checkedIndexes.remove(i, j - i);

            int n = checkedIndexes.getLength();
            while (i < n) {
                checkedIndexes.update(i, checkedIndexes.get(i) - count);
                i++;
            }

            // Notify listeners that items were removed
            listViewItemListeners.itemsRemoved(ListView.this, index, count);

            if (updated > 0) {
                listViewSelectionListeners.selectedRangesChanged(ListView.this, getSelectedRanges());

                if (selectMode == SelectMode.SINGLE
                    && getSelectedIndex() != previousSelectedIndex) {
                    listViewSelectionListeners.selectedItemChanged(ListView.this, null);
                }
            }
        }

        @Override
        public void itemUpdated(List list, int index, Object previousItem) {
            listViewItemListeners.itemUpdated(ListView.this, index);
        }

        @Override
        public void listCleared(List list) {
            int cleared = rangeSelection.getLength();
            rangeSelection.clear();
            checkedIndexes.clear();

            listViewItemListeners.itemsCleared(ListView.this);

            if (cleared > 0) {
                listViewSelectionListeners.selectedRangesChanged(ListView.this, getSelectedRanges());

                if (selectMode == SelectMode.SINGLE) {
                    listViewSelectionListeners.selectedItemChanged(ListView.this, null);
                }
            }
        }

        @Override
        public void comparatorChanged(List list, Comparator previousComparator) {
            if (list.getComparator() != null) {
                int cleared = rangeSelection.getLength();
                rangeSelection.clear();
                checkedIndexes.clear();

                listViewItemListeners.itemsSorted(ListView.this);

                if (cleared > 0) {
                    listViewSelectionListeners.selectedRangesChanged(ListView.this, getSelectedRanges());

                    if (selectMode == SelectMode.SINGLE) {
                        listViewSelectionListeners.selectedItemChanged(ListView.this, null);
                    }
                }
            }
        }
    };

    private ListViewListenerList listViewListeners = new ListViewListenerList();
    private ListViewItemListenerList listViewItemListeners = new ListViewItemListenerList();
    private ListViewItemStateListenerList listViewItemStateListeners = new ListViewItemStateListenerList();
    private ListViewSelectionListenerList listViewSelectionListeners = new ListViewSelectionListenerList();
    private ListViewBindingListenerList listViewBindingListeners = new ListViewBindingListenerList();

    private static final ItemRenderer DEFAULT_ITEM_RENDERER = new ListViewItemRenderer();

    /**
     * Creates a list view populated with an empty array list.
     */
    public ListView() {
        this(new ArrayList());
    }

    /**
     * Creates a list view populated with the given list data.
     * 

     * Note that the default renderer uses (as last option) the toString method on list elements,
     * so override it to return whatever you want to display in the ListView,
     * or implement your own custom renderer.
     *
     * @param listData
     * The data to set.
     *
     * @see ListViewItemRenderer
     */
    public ListView(List listData) {
        setItemRenderer(DEFAULT_ITEM_RENDERER);
        setListData(listData);

        installSkin(ListView.class);
    }

    /**
     * Returns the list data.
     *
     * @return
     * The data currently presented by the list view.
     */
    public List getListData() {
        return this.listData;
    }

    /**
     * Sets the list data.
     *
     * @param listData
     * The data to be presented by the list view.
     */
    @SuppressWarnings("unchecked")
    public void setListData(List listData) {
        if (listData == null) {
            throw new IllegalArgumentException("listData is null.");
        }

        List previousListData = this.listData;

        if (previousListData != listData) {
            int cleared;
            if (previousListData != null) {
                // Clear any existing selection
                cleared = rangeSelection.getLength();
                rangeSelection.clear();
                checkedIndexes.clear();

                ((List)previousListData).getListListeners().remove(listDataListener);
            } else {
                cleared = 0;
            }

            ((List)listData).getListListeners().add(listDataListener);

            // Update the list data and fire change event
            this.listData = listData;
            listViewListeners.listDataChanged(this, previousListData);

            if (cleared > 0) {
                listViewSelectionListeners.selectedRangesChanged(this, getSelectedRanges());

                if (selectMode == SelectMode.SINGLE) {
                    listViewSelectionListeners.selectedItemChanged(this, null);
                }
            }
        }
    }

    /**
     * Sets the list data.
     *
     * @param listData
     * A JSON string (must begin with [ and end with ])
     * denoting the data to be presented by the list view.
     */
    public final void setListData(String listData) {
        if (listData == null) {
            throw new IllegalArgumentException("listData is null.");
        }

        try {
            setListData(JSONSerializer.parseList(listData));
        } catch (SerializationException exception) {
            throw new IllegalArgumentException(exception);
        }
    }

    /**
     * Sets the list data.
     *
     * @param listData
     * A URL referring to a JSON file containing the data to be presented by
     * the list view.
     */
    public void setListData(URL listData) {
        if (listData == null) {
            throw new IllegalArgumentException("listData is null.");
        }

        JSONSerializer jsonSerializer = new JSONSerializer();

        try {
            setListData((List)jsonSerializer.readObject(listData.openStream()));
        } catch (SerializationException exception) {
            throw new IllegalArgumentException(exception);
        } catch (IOException exception) {
            throw new IllegalArgumentException(exception);
        }
    }

    @Override
    protected void setSkin(org.apache.pivot.wtk.Skin skin) {
        if (!(skin instanceof ListView.Skin)) {
            throw new IllegalArgumentException("Skin class must implement "
                + ListView.Skin.class.getName());
        }

        super.setSkin(skin);
    }

    /**
     * Returns the item renderer used for items in this list.
     */
    public ItemRenderer getItemRenderer() {
        return itemRenderer;
    }

    /**
     * Sets the item renderer to be used for items in this list.
     *
     * @param itemRenderer
     * The item renderer for the list.
     */
    public void setItemRenderer(ItemRenderer itemRenderer) {
        if (itemRenderer == null) {
            throw new IllegalArgumentException("itemRenderer is null.");
        }

        ItemRenderer previousItemRenderer = this.itemRenderer;

        if (previousItemRenderer != itemRenderer) {
            this.itemRenderer = itemRenderer;
            listViewListeners.itemRendererChanged(this, previousItemRenderer);
        }
    }

    /**
     * Returns the editor used to edit items in this list.
     *
     * @return
     * The item editor, or null if no editor is installed.
     */
    public ItemEditor getItemEditor() {
        return itemEditor;
    }

    /**
     * Sets the editor used to edit items in this list.
     *
     * @param itemEditor
     * The item editor for the list.
     */
    public void setItemEditor(ItemEditor itemEditor) {
        ItemEditor previousItemEditor = this.itemEditor;

        if (previousItemEditor != itemEditor) {
            this.itemEditor = itemEditor;
            listViewListeners.itemEditorChanged(this, previousItemEditor);
        }
    }

    /**
     * Returns the currently selected index, even when in multi-select mode.
     *
     * @return
     * The currently selected index.
     */
    public int getSelectedIndex() {
        return getFirstSelectedIndex();
    }

    /**
     * Sets the selection to a single index.
     *
     * @param index
     * The index to select, or -1 to clear the selection.
     */
    public void setSelectedIndex(int index) {
        if (index == -1) {
            clearSelection();
        } else {
            int listDataLength = listData.getLength();
            if (listDataLength > 0 && index < listDataLength) {
                setSelectedRange(index, index);
            }
        }
    }

    /**
     * Sets the selection to a single range.
     *
     * @param start
     * @param end
     */
    public void setSelectedRange(int start, int end) {
        ArrayList selectedRanges = new ArrayList();
        selectedRanges.add(new Span(start, end));

        setSelectedRanges(selectedRanges);
    }

    /**
     * Returns the currently selected ranges.
     *
     * @return
     * An immutable list containing the currently selected ranges. Note that the returned
     * list is a wrapper around the actual selection, not a copy. Any changes made to the
     * selection state will be reflected in the list, but events will not be fired.
     */
    public ImmutableList getSelectedRanges() {
        return rangeSelection.getSelectedRanges();
    }

    /**
     * Sets the selection to the given range sequence. Any overlapping or
     * connecting ranges will be consolidated, and the resulting selection will
     * be sorted in ascending order.
     *
     * @param selectedRanges
     *
     * @return
     * The ranges that were actually set.
     */
    public Sequence setSelectedRanges(Sequence selectedRanges) {
        if (selectedRanges == null) {
            throw new IllegalArgumentException("selectedRanges is null.");
        }

        // When we're in mode NONE, the only thing we can do is to clear the selection
        if (selectMode == SelectMode.NONE
            && selectedRanges.getLength() > 0) {
            throw new IllegalArgumentException("Selection is not enabled.");
        }

        // Update the selection
        Sequence previousSelectedRanges = this.rangeSelection.getSelectedRanges();
        Object previousSelectedItem = (selectMode == SelectMode.SINGLE) ? getSelectedItem() : null;

        RangeSelection listSelection = new RangeSelection();
        for (int i = 0, n = selectedRanges.getLength(); i < n; i++) {
            Span range = selectedRanges.get(i);

            if (range == null) {
                throw new IllegalArgumentException("range is null.");
            }

            if (range.start < 0 || range.end >= listData.getLength()) {
                throw new IndexOutOfBoundsException();
            }

            listSelection.addRange(range.start, range.end);
        }

        this.rangeSelection = listSelection;

        // Notify listeners
        listViewSelectionListeners.selectedRangesChanged(this, previousSelectedRanges);

        if (selectMode == SelectMode.SINGLE) {
            listViewSelectionListeners.selectedItemChanged(this, previousSelectedItem);
        }

        return getSelectedRanges();
    }

    /**
     * Sets the selection to the given range sequence.
     *
     * @param selectedRanges
     * A JSON-formatted string containing the ranges to select.
     *
     * @return
     * The ranges that were actually set.
     *
     * @throws
     * IllegalArgumentException if the range string is {@code null} or
     * if it can't be parsed as a JSON list.
     *
     * @see #setSelectedRanges(Sequence)
     */
    public final Sequence setSelectedRanges(String selectedRanges) {
        if (selectedRanges == null) {
            throw new IllegalArgumentException("selectedRanges is null.");
        }

        try {
            setSelectedRanges(parseSelectedRanges(selectedRanges));
        } catch (SerializationException exception) {
            throw new IllegalArgumentException(exception);
        }

        return getSelectedRanges();
    }

    @SuppressWarnings("unchecked")
    private static Sequence parseSelectedRanges(String json)
        throws SerializationException {
        ArrayList selectedRanges = new ArrayList();

        List list = JSONSerializer.parseList(json);
        for (Object item : list) {
            Map map = (Map)item;
            selectedRanges.add(new Span(map));
        }

        return selectedRanges;
    }

    /**
     * Returns the first selected index.
     *
     * @return
     * The first selected index, or -1 if nothing is selected.
     */
    public int getFirstSelectedIndex() {
        return (rangeSelection.getLength() > 0) ? rangeSelection.get(0).start : -1;
    }

    /**
     * Returns the last selected index.
     *
     * @return
     * The last selected index, or -1 if nothing is selected.
     */
    public int getLastSelectedIndex() {
        return (rangeSelection.getLength() > 0) ?
            rangeSelection.get(rangeSelection.getLength() - 1).end : -1;
    }

    /**
     * Adds a single index to the selection.
     *
     * @param index
     * The index to add.
     *
     * @return
     * true if the index was added to the selection; false,
     * otherwise.
     */
    public boolean addSelectedIndex(int index) {
        Sequence addedRanges = addSelectedRange(index, index);
        return (addedRanges.getLength() > 0);
    }

    /**
     * Adds a range of indexes to the selection.
     *
     * @param start
     * The first index in the range.
     *
     * @param end
     * The last index in the range.
     *
     * @return
     * The ranges that were added to the selection.
     *
     * @throws
     * IllegalStateException if the {@code ListView} is not in multi-selection mode.
     */
    public Sequence addSelectedRange(int start, int end) {
        if (selectMode != SelectMode.MULTI) {
            throw new IllegalStateException("List view is not in multi-select mode.");
        }

        if (start < 0 || end >= listData.getLength()) {
            throw new IndexOutOfBoundsException();
        }

        Sequence addedRanges = rangeSelection.addRange(start, end);

        int n = addedRanges.getLength();
        for (int i = 0; i < n; i++) {
            Span addedRange = addedRanges.get(i);
            listViewSelectionListeners.selectedRangeAdded(this, addedRange.start, addedRange.end);
        }

        if (n > 0) {
            listViewSelectionListeners.selectedRangesChanged(this, null);
        }

        return addedRanges;
    }

    /**
     * Adds a range of indexes to the selection.
     *
     * @param range
     * The range to add.
     *
     * @return
     * The ranges that were added to the selection.
     *
     * @throws
     * IllegalArgumentException if the range is {@code null}.
     */
    public Sequence addSelectedRange(Span range) {
        if (range == null) {
            throw new IllegalArgumentException("range is null.");
        }

        return addSelectedRange(range.start, range.end);
    }

    /**
     * Removes a single index from the selection.
     *
     * @param index
     * The index to remove.
     *
     * @return
     * true if the index was removed from the selection;
     * false, otherwise.
     */
    public boolean removeSelectedIndex(int index) {
        Sequence removedRanges = removeSelectedRange(index, index);
        return (removedRanges.getLength() > 0);
    }

    /**
     * Removes a range of indexes from the selection.
     *
     * @param start
     * The start of the range to remove.
     *
     * @param end
     * The end of the range to remove.
     *
     * @return
     * The ranges that were removed from the selection.
     *
     * @throws
     * IllegalStateException if the {@code ListView} is not in multi-selection mode.
     */
    public Sequence removeSelectedRange(int start, int end) {
        if (selectMode != SelectMode.MULTI) {
            throw new IllegalStateException("List view is not in multi-select mode.");
        }

        if (start < 0 || end >= listData.getLength()) {
            throw new IndexOutOfBoundsException();
        }

        Sequence removedRanges = rangeSelection.removeRange(start, end);

        int n = removedRanges.getLength();
        for (int i = 0; i < n; i++) {
            Span removedRange = removedRanges.get(i);
            listViewSelectionListeners.selectedRangeRemoved(this, removedRange.start, removedRange.end);
        }

        if (n > 0) {
            listViewSelectionListeners.selectedRangesChanged(this, null);
        }

        return removedRanges;
    }

    /**
     * Removes a range of indexes from the selection.
     *
     * @param range
     * The range to remove.
     *
     * @return
     * The ranges that were removed from the selection.
     */
    public Sequence removeSelectedRange(Span range) {
        if (range == null) {
            throw new IllegalArgumentException("range is null.");
        }

        return removeSelectedRange(range.start, range.end);
    }

    /**
     * Selects all items in the list.
     */
    public void selectAll() {
        setSelectedRange(0, listData.getLength() - 1);
    }

    /**
     * Clears the selection.
     */
    public void clearSelection() {
        if (rangeSelection.getLength() > 0) {
            setSelectedRanges(new ArrayList(0));
        }
    }

    /**
     * Returns the selection state of a given index.
     *
     * @param index
     * The index whose selection state is to be tested.
     *
     * @return true if the index is selected; false,
     * otherwise.
     */
    public boolean isItemSelected(int index) {
        indexBoundsCheck("index", index, 0, listData.getLength() - 1);

        return (rangeSelection.containsIndex(index));
    }

    public Object getSelectedItem() {
        int index = getSelectedIndex();
        Object item = null;

        if (index >= 0) {
            item = listData.get(index);
        }

        return item;
    }

    @SuppressWarnings("unchecked")
    public void setSelectedItem(Object item) {
        setSelectedIndex((item == null) ? -1 : ((List)listData).indexOf(item));
    }

    public Sequence getSelectedItems() {
        ArrayList items = new ArrayList();

        for (int i = 0, n = rangeSelection.getLength(); i < n; i++) {
            Span range = rangeSelection.get(i);

            for (int index = range.start; index <= range.end; index++) {
                Object item = listData.get(index);
                items.add(item);
            }
        }

        return items;
    }

    @SuppressWarnings("unchecked")
    public void setSelectedItems(Sequence items) {
        if (items == null) {
            throw new IllegalArgumentException();
        }

        ArrayList selectedRanges = new ArrayList();

        for (int i = 0, n = items.getLength(); i < n; i++) {
            Object item = items.get(i);
            if (item == null) {
                throw new IllegalArgumentException("item is null");
            }

            int index = ((List)listData).indexOf(item);
            if (index == -1) {
                throw new IllegalArgumentException("\"" + item + "\" is not a valid selection.");
            }

            selectedRanges.add(new Span(index));
        }

        setSelectedRanges(selectedRanges);
    }

    /**
     * Returns the current selection mode.
     */
    public SelectMode getSelectMode() {
        return selectMode;
    }

    /**
     * Sets the selection mode. Clears the selection if the mode has changed
     * (but does not fire a selection change event).
     *
     * @param selectMode
     * The new selection mode.
     */
    public void setSelectMode(SelectMode selectMode) {
        if (selectMode == null) {
            throw new IllegalArgumentException("selectMode is null.");
        }

        SelectMode previousSelectMode = this.selectMode;

        if (previousSelectMode != selectMode) {
            // Clear any current selection
            clearSelection();

            // Update the selection mode
            this.selectMode = selectMode;

            // Fire select mode change event
            listViewListeners.selectModeChanged(this, previousSelectMode);
        }
    }

    /**
     * Returns the current check mode.
     */
    public boolean getCheckmarksEnabled() {
      return checkmarksEnabled;
    }

    /**
     * Enables or disables checkmarks. Clears the check state if the check
     * mode has changed (but does not fire any check state change events).
     *
     * @param checkmarksEnabled Whether checkmarks are enabled for each item.
     */
    public void setCheckmarksEnabled(boolean checkmarksEnabled) {
        if (this.checkmarksEnabled != checkmarksEnabled) {
            // Clear any current check state
            checkedIndexes.clear();

            // Update the check mode
            this.checkmarksEnabled = checkmarksEnabled;

            // Fire select mode change event
            listViewListeners.checkmarksEnabledChanged(this);
        }
    }

    /**
     * Returns an item's checked state.
     *
     * @param index Index of item to interrogate.
     */
    public boolean isItemChecked(int index) {
        return (ArrayList.binarySearch(checkedIndexes, index) >= 0);
    }

    /**
     * Sets an item's checked state.
     *
     * @param index Index of item.
     * @param checked New value for the item's checked state.
     * @throws IllegalStateException if checkmarks are not enabled.
     */
    public void setItemChecked(int index, boolean checked) {
        if (!checkmarksEnabled) {
            throw new IllegalStateException("Checkmarks are not enabled.");
        }

        int i = ArrayList.binarySearch(checkedIndexes, index);

        if ((i < 0 && checked)
            || (i >= 0 && !checked)) {
            if (checked) {
               checkedIndexes.insert(index, -(i + 1));
            } else {
               checkedIndexes.remove(i, 1);
            }

            listViewItemStateListeners.itemCheckedChanged(this, index);
        }
    }

    /**
     * Returns the indexes of currently checked items.
     */
    public ImmutableList getCheckedIndexes() {
        return new ImmutableList(checkedIndexes);
    }

    /**
     * Clears the checked state of all checked items.
     */
    public void clearCheckmarks() {
        ArrayList checkedIndexesLocal = this.checkedIndexes;
        this.checkedIndexes = new ArrayList();

        for (Integer index : checkedIndexesLocal) {
            listViewItemStateListeners.itemCheckedChanged(this, index);
        }
    }

    /**
     * Tells whether or not an item's checkmark is disabled.  Queries the
     * current disabled checkmark filter (if any).
     *
     * @param index
     * The index of the item whose disabled checkmark state is to be tested.
     *
     * @return
     * true if the item's checkmark is disabled; false
     * otherwise (such as if no disabled checkmark filter is set).
     */
    @SuppressWarnings("unchecked")
    public boolean isCheckmarkDisabled(int index) {
        boolean disabled = false;

        if (disabledCheckmarkFilter != null) {
            Object item = listData.get(index);
            disabled = ((Filter)disabledCheckmarkFilter).include(item);
        }

        return disabled;
    }

    /**
     * Returns the disabled checkmark filter, which determines which checkboxes
     * are interactive and which are not. Note that this filter only affects
     * user interaction; items may still be checked programatically despite
     * their inclusion in this filter. If this filter is set to null,
     * all checkboxes will be interactive.
     * 

     * Note: this filter is only relevant if
     * {@link #setCheckmarksEnabled(boolean) checkmarksEnabled} is set to true.
     *
     * @return
     * The disabled checkmark filter, or null if no disabled checkmark
     * filter is set
     */
    public Filter getDisabledCheckmarkFilter() {
        return disabledCheckmarkFilter;
    }

    /**
     * Sets the disabled checkmark filter, which determines which checkboxes
     * are interactive and which are not. Note that this filter only affects
     * user interaction; items may still be checked programatically despite
     * their inclusion in this filter. If this filter is set to null,
     * all checkboxes will be interactive.
     * 

     * Note: this filter is only relavent if
     * {@link #setCheckmarksEnabled(boolean) checkmarksEnabled} is set to true.
     * enabled.
     *
     * @param disabledCheckmarkFilter
     * The disabled checkmark filter, or null for no disabled
     * checkmark filter
     */
    public void setDisabledCheckmarkFilter(Filter disabledCheckmarkFilter) {
        Filter previousDisabledCheckmarkFilter = this.disabledCheckmarkFilter;

        if (previousDisabledCheckmarkFilter !=disabledCheckmarkFilter ) {
            this.disabledCheckmarkFilter = disabledCheckmarkFilter;
            listViewListeners.disabledCheckmarkFilterChanged(this, previousDisabledCheckmarkFilter);
        }
    }

    /**
     * Returns an item's disabled state.
     *
     * @param index
     * The index of the item whose disabled state is to be tested.
     *
     * @return
     * true if the item is disabled; false,
     * otherwise.
     */
    @SuppressWarnings("unchecked")
    public boolean isItemDisabled(int index) {
        boolean disabled = false;

        if (disabledItemFilter != null) {
            Object item = listData.get(index);
            disabled = ((Filter)disabledItemFilter).include(item);
        }

        return disabled;
    }

    /**
     * Returns the disabled item filter.
     *
     * @return
     * The disabled item filter, or null if no disabled item filter is
     * set.
     */
    public Filter getDisabledItemFilter() {
        return disabledItemFilter;
    }

    /**
     * Sets the disabled item filter.
     *
     * @param disabledItemFilter
     * The disabled item filter, or null for no disabled item filter.
     */
    public void setDisabledItemFilter(Filter disabledItemFilter) {
        Filter previousDisabledItemFilter = this.disabledItemFilter;

        if (previousDisabledItemFilter != disabledItemFilter) {
            this.disabledItemFilter = disabledItemFilter;
            listViewListeners.disabledItemFilterChanged(this, previousDisabledItemFilter);
        }
    }

    /**
     * Returns name of the key that is used in context binding.
     *
     * @return
     * The key.
     */
    public String getListDataKey() {
        return listDataKey;
    }

    /**
     * Set the name of the key that is used in context binding.
     *
     * @param listDataKey
     * The key to set.
     */
    public void setListDataKey(String listDataKey) {
        String previousListDataKey = this.listDataKey;
        if (previousListDataKey != listDataKey) {
            this.listDataKey = listDataKey;
            listViewBindingListeners.listDataKeyChanged(this, previousListDataKey);
        }
    }

    public BindType getListDataBindType() {
        return listDataBindType;
    }

    public void setListDataBindType(BindType listDataBindType) {
        if (listDataBindType == null) {
            throw new IllegalArgumentException();
        }

        BindType previousListDataBindType = this.listDataBindType;

        if (previousListDataBindType != listDataBindType) {
            this.listDataBindType = listDataBindType;
            listViewBindingListeners.listDataBindTypeChanged(this, previousListDataBindType);
        }
    }

    public ListDataBindMapping getListDataBindMapping() {
        return listDataBindMapping;
    }

    public void setListDataBindMapping(ListDataBindMapping listDataBindMapping) {
        ListDataBindMapping previousListDataBindMapping = this.listDataBindMapping;

        if (previousListDataBindMapping != listDataBindMapping) {
            this.listDataBindMapping = listDataBindMapping;
            listViewBindingListeners.listDataBindMappingChanged(this, previousListDataBindMapping);
        }
    }

    public String getSelectedItemKey() {
        return selectedItemKey;
    }

    public void setSelectedItemKey(String selectedItemKey) {
        String previousSelectedItemKey = this.selectedItemKey;

        if (previousSelectedItemKey != selectedItemKey) {
            this.selectedItemKey = selectedItemKey;
            listViewBindingListeners.selectedItemKeyChanged(this, previousSelectedItemKey);
        }
    }

    public BindType getSelectedItemBindType() {
        return selectedItemBindType;
    }

    public void setSelectedItemBindType(BindType selectedItemBindType) {
        if (selectedItemBindType == null) {
            throw new IllegalArgumentException();
        }

        BindType previousSelectedItemBindType = this.selectedItemBindType;
        if (previousSelectedItemBindType != selectedItemBindType) {
            this.selectedItemBindType = selectedItemBindType;
            listViewBindingListeners.selectedItemBindTypeChanged(this, previousSelectedItemBindType);
        }
    }

    public ItemBindMapping getSelectedItemBindMapping() {
        return selectedItemBindMapping;
    }

    public void setSelectedItemBindMapping(ItemBindMapping selectedItemBindMapping) {
        ItemBindMapping previousSelectedItemBindMapping = this.selectedItemBindMapping;

        if (previousSelectedItemBindMapping != selectedItemBindMapping) {
            this.selectedItemBindMapping = selectedItemBindMapping;
            listViewBindingListeners.selectedItemBindMappingChanged(this, previousSelectedItemBindMapping);
        }
    }

    public String getSelectedItemsKey() {
        return selectedItemsKey;
    }

    public void setSelectedItemsKey(String selectedItemsKey) {
        String previousSelectedItemsKey = this.selectedItemsKey;

        if (previousSelectedItemsKey != selectedItemsKey) {
            this.selectedItemsKey = selectedItemsKey;
            listViewBindingListeners.selectedItemsKeyChanged(this, previousSelectedItemsKey);
        }
    }

    public BindType getSelectedItemsBindType() {
        return selectedItemsBindType;
    }

    public void setSelectedItemsBindType(BindType selectedItemsBindType) {
        if (selectedItemsBindType == null) {
            throw new IllegalArgumentException();
        }

        BindType previousSelectedItemsBindType = this.selectedItemsBindType;
        if (previousSelectedItemsBindType != selectedItemsBindType) {
            this.selectedItemsBindType = selectedItemsBindType;
            listViewBindingListeners.selectedItemsBindTypeChanged(this, previousSelectedItemsBindType);
        }
    }

    public ItemBindMapping getSelectedItemsBindMapping() {
        return selectedItemsBindMapping;
    }

    public void setSelectedItemsBindMapping(ItemBindMapping selectedItemsBindMapping) {
        ItemBindMapping previousSelectedItemsBindMapping = this.selectedItemsBindMapping;

        if (previousSelectedItemsBindMapping != selectedItemsBindMapping) {
            this.selectedItemsBindMapping = selectedItemsBindMapping;
            listViewBindingListeners.selectedItemsBindMappingChanged(this, previousSelectedItemsBindMapping);
        }
    }

    public String getCheckedItemsKey() {
        return checkedItemsKey;
    }

    public void setCheckedItemsKey(String checkedItemsKey) {
        String previousCheckedItemsKey = this.checkedItemsKey;

        if (previousCheckedItemsKey != checkedItemsKey) {
            this.checkedItemsKey = checkedItemsKey;
            listViewBindingListeners.checkedItemsKeyChanged(this, previousCheckedItemsKey);
        }
    }

    public BindType getCheckedItemsBindType() {
        return checkedItemsBindType;
    }

    public void setCheckedItemsBindType(BindType checkedItemsBindType) {
        if (checkedItemsBindType == null) {
            throw new IllegalArgumentException();
        }

        BindType previousCheckedItemsBindType = this.checkedItemsBindType;
        if (previousCheckedItemsBindType != checkedItemsBindType) {
            this.checkedItemsBindType = checkedItemsBindType;
            listViewBindingListeners.checkedItemsBindTypeChanged(this, previousCheckedItemsBindType);
        }
    }

    public ItemBindMapping getCheckedItemsBindMapping() {
        return checkedItemsBindMapping;
    }

    public void setCheckedItemsBindMapping(ItemBindMapping checkedItemsBindMapping) {
        ItemBindMapping previousCheckedItemsBindMapping = this.checkedItemsBindMapping;

        if (previousCheckedItemsBindMapping != checkedItemsBindMapping) {
            this.checkedItemsBindMapping = checkedItemsBindMapping;
            listViewBindingListeners.checkedItemsBindMappingChanged(this, previousCheckedItemsBindMapping);
        }
    }

    @Override
    @SuppressWarnings("unchecked")
    public void load(Object context) {
        // Bind to list data
        if (listDataKey != null
            && listDataBindType != BindType.STORE
            && JSON.containsKey(context, listDataKey)) {
            Object value = JSON.get(context, listDataKey);

            List listDataLocal;
            if (listDataBindMapping == null) {
                listDataLocal = (List)value;
            } else {
                listDataLocal = listDataBindMapping.toListData(value);
            }

            setListData(listDataLocal);
        }

        switch (selectMode) {
            case SINGLE: {
                // Bind using selected item key
                if (selectedItemKey != null
                    && selectedItemBindType != BindType.STORE
                    && JSON.containsKey(context, selectedItemKey)) {
                    Object item = JSON.get(context, selectedItemKey);

                    int index;
                    if (selectedItemBindMapping == null) {
                        index = ((List)listData).indexOf(item);
                    } else {
                        index = selectedItemBindMapping.indexOf(listData, item);
                    }

                    setSelectedIndex(index);
                }

                break;
            }

            case MULTI: {
                // Bind using selected items key
                if (selectedItemsKey != null
                    && selectedItemsBindType != BindType.STORE
                    && JSON.containsKey(context, selectedItemsKey)) {
                    Sequence items = (Sequence)JSON.get(context, selectedItemsKey);

                    clearSelection();

                    for (int i = 0, n = items.getLength(); i < n; i++) {
                        Object item = items.get(i);

                        int index;
                        if (selectedItemsBindMapping == null) {
                            index = ((List)listData).indexOf(item);
                        } else {
                            index = selectedItemsBindMapping.indexOf(listData, item);
                        }

                        if (index != -1) {
                            addSelectedIndex(index);
                        }
                    }
                }

                break;
            }

            case NONE: {
                break;
            }

            default: {
                break;
            }
        }

        if (checkmarksEnabled) {
            if (checkedItemsKey != null
                && JSON.containsKey(context, checkedItemsKey)
                && checkedItemsBindType != BindType.STORE) {
                Sequence items = (Sequence)JSON.get(context, checkedItemsKey);

                clearCheckmarks();

                for (int i = 0, n = items.getLength(); i < n; i++) {
                    Object item = items.get(i);

                    int index;
                    if (checkedItemsBindMapping == null) {
                        index = ((List)listData).indexOf(item);
                    } else {
                        index = checkedItemsBindMapping.indexOf(listData, item);
                    }

                    if (index != -1) {
                        setItemChecked(index, true);
                    }
                }
            }
        }
    }

    @Override
    public void store(Object context) {
        // Bind to list data
        if (listDataKey != null
            && listDataBindType != BindType.LOAD) {
            Object value;
            if (listDataBindMapping == null) {
                value = listData;
            } else {
                value = listDataBindMapping.valueOf(listData);
            }

            JSON.put(context, listDataKey, value);
        }

        switch (selectMode) {
            case SINGLE: {
                // Bind using selected item key
                if (selectedItemKey != null
                    && selectedItemBindType != BindType.LOAD) {
                    Object item;

                    int selectedIndexLocal = getSelectedIndex();
                    if (selectedItemBindMapping == null) {
                        if (selectedIndexLocal == -1) {
                            item = null;
                        } else {
                            item = listData.get(selectedIndexLocal);
                        }
                    } else {
                        item = selectedItemBindMapping.get(listData, selectedIndexLocal);
                    }

                    JSON.put(context, selectedItemKey, item);
                }

                break;
            }

            case MULTI: {
                // Bind using selected items key
                if (selectedItemsKey != null
                    && selectedItemsBindType != BindType.LOAD) {
                    ArrayList items = new ArrayList();

                    Sequence selectedRanges = getSelectedRanges();
                    for (int i = 0, n = selectedRanges.getLength(); i < n; i++) {
                        Span range = selectedRanges.get(i);

                        for (int index = range.start; index <= range.end; index++) {
                            Object item;
                            if (selectedItemsBindMapping == null) {
                                item = listData.get(index);
                            } else {
                                item = selectedItemsBindMapping.get(listData, index);
                            }

                            items.add(item);
                        }
                    }

                    JSON.put(context, selectedItemsKey, items);
                }

                break;
            }

            case NONE: {
                break;
            }

            default: {
                break;
            }
        }

        if (checkmarksEnabled) {
            if (checkedItemsKey != null
                && JSON.containsKey(context, checkedItemsKey)
                && checkedItemsBindType != BindType.LOAD) {
                ArrayList items = new ArrayList();

                for (int i = 0, n = checkedIndexes.getLength(); i < n; i++) {
                    Integer index = checkedIndexes.get(i);

                    Object item;
                    if (checkedItemsBindMapping == null) {
                        item = listData.get(index);
                    } else {
                        item = checkedItemsBindMapping.get(listData, index);
                    }

                    items.add(item);
                }

                JSON.put(context, checkedItemsKey, items);
            }
        }
    }

    @Override
    public void clear() {
        if (listDataKey != null) {
            setListData(new ArrayList());
        }

        if (selectedItemKey != null
            || selectedItemsKey != null) {
            setSelectedItem(null);
        }

        if (checkedItemsKey != null) {
            clearCheckmarks();
        }
    }

    /**
     * Returns the index of the item at a given location.
     *
     * @param y
     * The y-coordinate of the item to identify.
     *
     * @return
     * The item index, or -1 if there is no item at the given
     * y-coordinate.
     */
    public int getItemAt(int y) {
        ListView.Skin listViewSkin = (ListView.Skin)getSkin();
        return listViewSkin.getItemAt(y);
    }

    /**
     * Returns the bounding area of a given item.
     *
     * @param index
     * The item index.
     *
     * @return
     * The bounding area of the item.
     */
    public Bounds getItemBounds(int index) {
        ListView.Skin listViewSkin = (ListView.Skin)getSkin();
        return listViewSkin.getItemBounds(index);
    }

    /**
     * Returns the item indent.
     *
     * @return
     * The horizontal space preceding items in the list.
     */
    public int getItemIndent() {
        ListView.Skin listViewSkin = (ListView.Skin)getSkin();
        return listViewSkin.getItemIndent();
    }

    /**
     * Returns the list view listener list.
     */
    public ListenerList getListViewListeners() {
        return listViewListeners;
    }

    /**
     * Returns the list view item listener list.
     */
    public ListenerList getListViewItemListeners() {
        return listViewItemListeners;
    }

    /**
     * Returns the list view item state listener list.
     */
    public ListenerList getListViewItemStateListeners() {
        return listViewItemStateListeners;
    }

    /**
     * Returns the list view selection detail listener list.
     */
    public ListenerList getListViewSelectionListeners() {
        return listViewSelectionListeners;
    }

    public ListenerList getListViewBindingListeners() {
        return listViewBindingListeners;
    }
}
    

    

    

            

    

            



    
    






    
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