nextapp.echo.app.ListBox Maven / Gradle / Ivy
/*
* This file is part of the Echo Web Application Framework (hereinafter "Echo").
* Copyright (C) 2002-2009 NextApp, Inc.
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*/
package nextapp.echo.app;
import nextapp.echo.app.list.AbstractListComponent;
import nextapp.echo.app.list.DefaultListModel;
import nextapp.echo.app.list.ListModel;
import nextapp.echo.app.list.ListSelectionModel;
/**
* ListBox component: a selection component which displays selection items in a list. May be configured to allow the
* selection of one item at a time, or to allow the selection of multiple items at one time. Does not support child components.
*/
public class ListBox extends AbstractListComponent {
/** Serial Version UID. */
private static final long serialVersionUID = 20070101L;
/**
* Creates an empty ListBox.
* A DefaultListModel will be created.
* A DefaultListSelectionModel will be created and used
* to describe selections.
*/
public ListBox() {
super();
}
/**
* Creates a ListBox visualizing the specified model.
* A DefaultListSelectionModel will be created and used
* to describe selections.
*
* @param model the initial model
*/
public ListBox(ListModel model) {
super(model, null);
}
/**
* Creates a ListBox visualizing the specified
* ListModel and describing selections using the specified
* ListSelectionModel.
*
* @param model the initial model
* @param selectionModel the initial selection model
*/
public ListBox(ListModel model, ListSelectionModel selectionModel) {
super(model, selectionModel);
}
/**
* Creates a ListBox with a DefaultListModel
* that initially contains the specified array of items.
* A DefaultListSelectionModel will be created and used
* to describe selections.
*
* @param itemArray an array of items that will initially populate
* this ListBox
*/
public ListBox(Object[] itemArray) {
super(new DefaultListModel(itemArray), null);
}
/**
* Returns the maximum selected index.
*
* @return the maximum selected index
*/
public int getMaxSelectedIndex() {
return getSelectionModel().getMaxSelectedIndex();
}
/**
* Returns the minimum selected index.
*
* @return The minimum selected index
*/
public int getMinSelectedIndex() {
return getSelectionModel().getMinSelectedIndex();
}
/**
* Returns all selected indices.
*
* @return an array containing all the selected indices
*/
public int[] getSelectedIndices() {
ListModel model = getModel();
int min = getMinSelectedIndex();
if (min == -1) {
// No indices are selected, return empty array.
return new int[0];
}
int selectionCount = 0;
int max = getMaxSelectedIndex();
int size = model.size();
if (max >= size - 1) {
max = size - 1;
}
for (int index = min; index <= max; ++index) {
if (isSelectedIndex(index)) {
++selectionCount;
}
}
int[] selectedIndices = new int[selectionCount];
selectionCount = 0;
for (int index = min; index <= max; ++index) {
if (isSelectedIndex(index)) {
selectedIndices[selectionCount] = index;
++selectionCount;
}
}
return selectedIndices;
}
/**
* Returns the selected item. This method is intended to be used when the
* when the selection model is configured to only allow one item to be
* selected at a time. In the event multiple item selection is enabled,
* this method will return the item at the lowest selected index.
*
* @return the selected item
*/
public Object getSelectedValue() {
ListModel model = getModel();
int selectedIndex = getMinSelectedIndex();
Object value;
if (selectedIndex == -1) {
value = null;
} else {
value = model.get(getMinSelectedIndex());
}
return value;
}
/**
* Returns all selected items.
*
* @return an array containing all the selected items
*/
public Object[] getSelectedValues() {
ListModel model = getModel();
int min = getMinSelectedIndex();
if (min == -1) {
// No values are selected, return empty array.
return new Object[0];
}
int selectionCount = 0;
int max = getMaxSelectedIndex();
int size = model.size();
if (max >= size - 1) {
max = size - 1;
}
for (int index = min; index <= max; ++index) {
if (isSelectedIndex(index)) {
++selectionCount;
}
}
Object[] selectedValues = new Object[selectionCount];
selectionCount = 0;
for (int index = min; index <= max; ++index) {
if (isSelectedIndex(index)) {
selectedValues[selectionCount] = model.get(index);
++selectionCount;
}
}
return selectedValues;
}
/**
* Returns the selection mode.
*
* @return the selection mode, one of the following values:
*
* ListSelectionModel.SINGLE_SELECTION: only one
* list element may be selected.ListSelectionModel.MULTIPLE_SELECTION:
* multiple list elements may be selected.
*/
public int getSelectionMode() {
return getSelectionModel().getSelectionMode();
}
/**
* Determines whether an index is selected.
*
* @param index the index
* @return the selection state of the index
*/
public boolean isSelectedIndex(int index) {
return getSelectionModel().isSelectedIndex(index);
}
/**
* Selects only the given index.
*
* @param index the index
*/
public void setSelectedIndex(int index) {
ListSelectionModel selectionModel = getSelectionModel();
selectionModel.clearSelection();
selectionModel.setSelectedIndex(index, true);
}
/**
* Sets the selection state of the given index.
*
* @param index the index
* @param selected the selection state
*/
public void setSelectedIndex(int index, boolean selected) {
getSelectionModel().setSelectedIndex(index, selected);
}
/**
* Selects the specified indices, deselecting any other indices.
*
* @param indices the indices to be selected
*/
public void setSelectedIndices(int[] indices) {
ListSelectionModel selectionModel = getSelectionModel();
selectionModel.clearSelection();
for (int i = 0; i < indices.length; ++i) {
selectionModel.setSelectedIndex(indices[i], true);
}
}
/**
* Sets the selection mode.
*
* @param newValue the selection mode, one of the following values:
*
* ListSelectionModel.SINGLE_SELECTION: only one
* list element may be selected.ListSelectionModel.MULTIPLE_SELECTION:
* multiple list elements may be selected.
*/
public void setSelectionMode(int newValue) {
getSelectionModel().setSelectionMode(newValue);
}
}