/*******************************************************************************

 * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved. This program and the accompanying materials 

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 * 

 * Contributors:

 *     Nokia Corporation - initial implementation 

 *******************************************************************************/

package org.eclipse.swt.internal.qt;

import java.util.Vector;

import java.lang.Integer;

import org.eclipse.swt.SWT;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.graphics.Internal_GfxPackageSupport;

public final class ListUtils extends Object {

/**

 * @see ListView.add

 */

public static void add(int handle, String item, Image icon) {

    if (item == null) {

        SWT.error(SWT.ERROR_NULL_ARGUMENT);

    }

    // OS may throw SWT.ERROR_ITEM_NOT_ADDED

    OS.QListWidget_addItem(handle, item, 

            icon != null ? Internal_GfxPackageSupport.getIconHandle(icon) : 0);

}

/**

 * @see ListView.add

 */

public static void add(int handle, String item, Image icon, int index) {

    if (item == null) {

        SWT.error(SWT.ERROR_NULL_ARGUMENT);            

    }

    if (index < 0 || index > OS.QListWidget_count(handle)) { // index == count is ok too!

        SWT.error(SWT.ERROR_INVALID_RANGE);

    }

    // OS may throw SWT.ERROR_ITEM_NOT_ADDED

    OS.QListWidget_insertItem(handle, index, item, 

            icon != null ? Internal_GfxPackageSupport.getIconHandle(icon) : 0);

}

/**

 * @see List.deselect

 */

public static void deselect(int handle, int index) {

    if (index < 0 || index >= OS.QListWidget_count(handle)) {

        return;

    }

    OS.QListWidget_swt_selectIndex(handle, index, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_DESELECT);

}

/**

 * @see List.deselect

 */

public static void deselect(int handle, int[] indices) {

    if (indices == null) {

        SWT.error(SWT.ERROR_NULL_ARGUMENT);

    }

    int length = indices.length;

    if (length == 0) {

        return;

    }

    OS.QListWidget_swt_selectArray(handle, indices, length, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_DESELECT, false);

}

/**

 * @see List.deselect

 */

public static void deselect(int handle, int start, int end) {

    if (start > end || end < 0) {

        return;

    }

    int count = OS.QListWidget_count(handle);

    if (start > count - 1) {

        return;

    }

    start = Math.max(0, start);

    end = Math.min(end, count - 1);

    OS.QListWidget_swt_selectRange(handle, start, end, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_DESELECT);

}

/**

 * @see List.deselectAll

 */

public static void deselectAll(int handle) {

    OS.QListWidget_swt_selectRange(handle, 0, 

            OS.QListWidget_count(handle) - 1, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_DESELECT);

}

/**

 * @see List.getFocusIndex

 */

public static int getFocusIndex(int handle) {

    return OS.QListWidget_currentRow(handle);

}

/**

 * @see List.getItem

 */

public static String getItem(int handle, int index) {

    if (index < 0 || index >= OS.QListWidget_count(handle)) {

        SWT.error(SWT.ERROR_INVALID_RANGE);

    }

    // OS may throw SWT.ERROR_CANNOT_GET_ITEM

    String item = OS.QListWidget_swt_itemText(handle, index);

    if (item == null) {

        SWT.error(SWT.ERROR_CANNOT_GET_ITEM);

    }

    return item;

}

/**

 * @see List.getItemCount

 */

public static int getItemCount(int handle) {

    // OS may throw SWT.SWT.ERROR_CANNOT_GET_COUNT        

    return OS.QListWidget_count(handle);

}

/**

 * @see List.getItemHeight

 */

public static int getItemHeight(int handle) {

    int itemHeight = 0;

    if (OS.QListWidget_count(handle) > 0 ) {

        itemHeight = OS.QAbstractItemView_sizeHintForRow(handle, 0);

    } 

    else {

         ListUtils.add(handle, "", null);

         itemHeight = OS.QAbstractItemView_sizeHintForRow(handle, 0);

         ListUtils.remove(handle, 0);

    }

    return itemHeight;

}

/**

 * @see List.getItems

 */

public static String[] getItems(int handle) {

    String[] res = OS.QListWidget_swt_itemTexts(handle);

    if (res == null) {

        if (OS.QListWidget_count(handle) == 0) {

            return new String[0];

        }

        else {

            SWT.error(SWT.ERROR_CANNOT_GET_ITEM);

            return null;

        }

    }

    else {

        if (OS.QListWidget_count(handle) != res.length) {

            SWT.error(SWT.ERROR_CANNOT_GET_COUNT);

            return null;

        }

    }

    return res;

}

/**

 * @see List.getSelection

 */

public static String[] getSelection(int handle) {

    int[] indices = OS.QListWidget_swt_selectedRows(handle, 0);

    if (indices == null || indices.length <= 0) {

        return new String[] {};

    }

    sort(indices);

    String[] res = new String[indices.length];

    for (int i = 0; i < indices.length; i++) {

        res[i] = OS.QListWidget_swt_itemText(handle, indices[i]);

        if (res[i] == null) {

            SWT.error(SWT.ERROR_CANNOT_GET_ITEM);

        }

    }

    return res;

}

/**

 * @see List.getSelectionCount

 */

public static int getSelectionCount(int handle) {

    int[] indices = OS.QListWidget_swt_selectedRows(handle, 0);

    if (indices != null) {

        return indices.length;

    } 

    else {

        return 0;

    }

}

/**

 * @see List.getSelectionIndices

 */

public static int[] getSelectionIndices(int handle) {

    int[] indices = OS.QListWidget_swt_selectedRows(handle, 0);

    if (indices == null) {

        indices = new int[] {};

    }

    sort(indices);

    return indices;

}

/**

 * @see List.indexOf

 */

public static int indexOf(int handle, String string, int start) {

    if (string == null) {

        SWT.error(SWT.ERROR_NULL_ARGUMENT);

    }

    if (start < 0 || start > OS.QListWidget_count(handle) - 1) {

        return -1;

    }

    return OS.QListWidget_swt_indexOf(handle, string, start);

}

/**

 * @see List.isSelected

 */

public static boolean isSelected(int handle, int index) {

    if (index < 0 || index > OS.QListWidget_count(handle) - 1) {

        return false;

    }

    return OS.QListWidget_swt_isItemSelected(handle, index);

}

/**

 * @see List.remove

 */

public static void remove(int handle, int index) {

    if ( index < 0 || index >= OS.QListWidget_count(handle) ) {

        SWT.error(SWT.ERROR_INVALID_RANGE);

    }

    // OS may throw SWT.ERROR_ITEM_NOT_REMOVED

    OS.QListWidget_swt_removeIndex(handle, index);

}

/**

 * @see List.remove

 */

public static void remove(int handle, String string) {

    if (string == null) {

        SWT.error(SWT.ERROR_NULL_ARGUMENT);

    }

    int index = OS.QListWidget_swt_indexOf(handle, string, 0);

    if (index == -1) {

        SWT.error(SWT.ERROR_INVALID_ARGUMENT);

    }

    OS.QListWidget_swt_removeIndex(handle, index);

}

/**

 * @see List.remove

 */

public static void remove(int handle, int start, int end) {

    if (start > end) {

        return;

    }

    int count = OS.QListWidget_count(handle);

    if (start < 0 || end >= count || start > count) {

        SWT.error(SWT.ERROR_INVALID_RANGE);

    }

    // OS may throw SWT.ERROR_ITEM_NOT_REMOVED

    OS.QListWidget_swt_removeRange(handle, start, end);

}

/**

 * @see List.remove

 * @return sorted array of removed indices

 */

public static int[] remove(int handle, int[] indices) {

    if (indices == null) {

        SWT.error(SWT.ERROR_NULL_ARGUMENT);

    }

    if (indices.length == 0) {

        return indices;

    }

    int[] idxs = sortAndRemoveDuplicates(indices);

    int count = OS.QListWidget_count(handle);

    if ( idxs[0] >= count || idxs[0] < 0 || idxs[idxs.length - 1] >= count) {

        SWT.error(SWT.ERROR_INVALID_RANGE);

    }

    // OS may throw SWT.ERROR_ITEM_NOT_REMOVED

    OS.QListWidget_swt_removeArray(handle, idxs, idxs.length);

    return idxs;

}

/**

 * @see List.removeAll

 */

public static void removeAll(int handle) {

    OS.QListWidget_clear(handle);

}

/**

 * @see List.select

 */

public static void select(int handle, int index, boolean multi) {

    if (index < 0 || index >= OS.QListWidget_count(handle)) {

        return;

    }

    int command = OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT;

    if (!multi) {

        command |= OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_CLEAR;

    }

    OS.QListWidget_swt_selectIndex(handle, index, command);

    if (!multi) {

        OS.QListWidget_swt_setFocusIndex(handle, index);

    }

}

/**

 * @see SortedList.select

 */

public static void select(int handle, String string, boolean multi) {

    if (string == null) {

        ListUtils.deselectAll(handle);

        return;

    }

    int index = OS.QListWidget_swt_indexOf(handle, string, 0);

    if (index == -1) {

        SWT.error(SWT.ERROR_INVALID_ARGUMENT);

    }

    int command = OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT;

    if (!multi) {

        command |= OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_CLEAR;

    }

    OS.QListWidget_swt_selectIndex(handle, index, command);

    if (!multi) {

        OS.QListWidget_swt_setFocusIndex(handle, index);

    }

}

/**

 * @see List.select

 */

public static void select(int handle, int start, int end, boolean multi) {

    if (start > end || end < 0) {

        return;

    }

    if (start == end) {

        select(handle, start, multi);

        return;

    }

    if (!multi) {

        return;

    }

    int count = OS.QListWidget_count(handle);

    if (start > count - 1) {

        return;

    }

    start = Math.max(0, start);

    end = Math.min(end, count - 1);

    OS.QListWidget_swt_selectRange(handle, start, end, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT);

}

/**

 * @see List.select

 */

public static void select(int handle, int[] indices, boolean multi) {

    if (indices == null) {

        SWT.error(SWT.ERROR_NULL_ARGUMENT);

    }

    int length = indices.length;

    if (length == 1) {

        select(handle, indices[0], multi);

        return;

    }

    if (length == 0 || !multi) {

        return;

    }

    OS.QListWidget_swt_selectArray(handle, indices, length, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT, false);

}

/**

 * @see List.selectAll

 */

public static void selectAll(int handle, boolean multi) {

    int count = OS.QListWidget_count(handle);

    if ((!multi) && count != 1) {

        return;

    }

    OS.QListWidget_swt_selectRange(handle, 0, count - 1, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT);

}

/**

 * Internal API

 */

public static void setFocusIndex(int handle, int index, boolean multi) {

    OS.QListWidget_swt_setFocusIndex(handle, index);

    if (!multi) {

        int command = OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT;

        command |= OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_CLEAR;

        OS.QListWidget_swt_selectIndex(handle, index, command);

    }

}

/**

 * @see ListView.setItems

 */

public static void setItems(int handle, String[] items, Image[] icons) {

    if (items == null) {

        SWT.error(SWT.ERROR_NULL_ARGUMENT);

    }

    if (icons != null && icons.length != items.length) {

        SWT.error(SWT.ERROR_INVALID_RANGE);

    }

    removeAll(handle);

    int count = items.length;

    if (count <= 0) {

        return;

    }

    int[] handles = null;

    if (icons != null) {

        handles = new int[icons.length];

        for (int i = 0; i < icons.length; i++) {

            if (icons[i] != null) {

                handles[i] = Internal_GfxPackageSupport.getIconHandle(icons[i]);

            }

            else {

                handles[i] = 0;

            }

        }

    }

    // OS may throw SWT.ERROR_ITEM_NOT_ADDED

    OS.QListWidget_addItems(handle, items, handles);

}

/**

 * @see List.setSelection

 */

public static void setSelection(int handle, int index) {

    int count = OS.QListWidget_count(handle);

    // deselectAll()

    OS.QListWidget_swt_selectRange(handle, 0, count - 1, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_DESELECT);

    if (index < 0 || index > count - 1) {

        return;

    }

    // select(int)

    OS.QListWidget_swt_selectIndex(handle, index, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT);

    OS.QListWidget_scrollToItem(handle, index, OS.QT_ABSTRACTITEMVIEW_SCROLLHINT_ENSUREVISIBLE);

    OS.QListWidget_swt_setFocusIndex(handle, index);

}

/**

 * @see List.setSelection

 */

public static void setSelection(int handle, int start, int end, boolean multi) {

    int count = OS.QListWidget_count(handle);

    // deselectAll()

    OS.QListWidget_swt_selectRange(handle, 0, count - 1, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_DESELECT);

    if (end < 0 || start > end || ((!multi) && start != end)) {

        return;

    }

    start = Math.max (0, start);

    end = Math.min(end, count - 1);

    // select(int, int)

    OS.QListWidget_swt_selectRange(handle, start, end, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT);

    OS.QListWidget_scrollToItem(handle, end, OS.QT_ABSTRACTITEMVIEW_SCROLLHINT_ENSUREVISIBLE);

    OS.QListWidget_swt_setFocusIndex(handle, end); 

}

/**

 * @see List.setSelection

 */

public static void setSelection(int handle, int[] indices, boolean multi) {

    if (indices == null) {

        SWT.error(SWT.ERROR_NULL_ARGUMENT);

    }

    int count = OS.QListWidget_count(handle);

    // deselectAll()

    OS.QListWidget_swt_selectRange(handle, 0, count - 1, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_DESELECT);        

    int length = indices.length;

    if (length == 0 || ((!multi) && length > 1)) {

        return;

    }

    // select(int[])

    OS.QListWidget_swt_selectArray(handle, indices, length, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT, true);

}

/**

 * @see List.setSelection

 */

public static void setSelection(int handle, String[] items, boolean multi) {

    if (items == null) {

        SWT.error (SWT.ERROR_NULL_ARGUMENT);

    }

    int count = OS.QListWidget_count(handle);

    // deselectAll()

    OS.QListWidget_swt_selectRange(handle, 0, count - 1, 

            OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_DESELECT);

    int length = items.length;

    if (length == 0 || ((!multi) && length > 1)) {

        return;

    }

    int selectCmd = OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_SELECT;

    if (!multi) {

        selectCmd |= OS.QT_ITEMSELECTIONMODEL_SELECTIONFLAGS_CLEAR;

    }

    int scrollItem = 0;

    for (int i = 0; i < length; i++) {

        int index = -1;

        String string = items [i];

        if (string != null) {

            while (index < count) {

                // indexOf(String, int)

                index = OS.QListWidget_swt_indexOf(handle, string, index >= 0 ? index : 0);

                if (index > -1) {

                    // select(int)

                    scrollItem = index;