/*
* GWTEventService
* Copyright (c) 2011 and beyond, strawbill UG (haftungsbeschr�nkt)
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
* Other licensing for GWTEventService may also be possible on request.
* Please view the license.txt of the project for more information.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package de.novanic.gwteventservice.demo.conversationapp.client.conversation.ui;
import com.google.gwt.user.client.ui.*;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.logical.shared.SelectionEvent;
import java.util.*;
/**
* @author sstrohschein
* <br>Date: 16.09.2008
* <br>Time: 13:44:19
*/
public class GWTConversationChannelPanel extends VerticalPanel implements ConversationChannelPanel
{
private Tree myChannelTree;
private Button myAddChannelButton;
private Collection<HandlerRegistration> myHandlerRegistrations;
public GWTConversationChannelPanel() {
setTitle("Channels");
setStyleName("styledPanel");
myHandlerRegistrations = new ArrayList<HandlerRegistration>();
myChannelTree = new Tree();
myChannelTree.setAnimationEnabled(true);
myAddChannelButton = new Button();
myAddChannelButton.setText("New Channel");
myAddChannelButton.setWidth("100px");
enable(false);
//add the content
add(new Label(getTitle()));
add(myAddChannelButton);
add(myChannelTree);
}
public boolean addChannel(String aChannel) {
final Iterator<TreeItem> theIterator = myChannelTree.treeItemIterator();
while(theIterator.hasNext()) {
TreeItem theTreeItem = theIterator.next();
//adds the channel if the channel doesn't already exists
if(aChannel.equals(theTreeItem.getText())) {
return false;
}
}
myChannelTree.addItem(aChannel);
return true;
}
public boolean removeChannel(String aChannel) {
final Iterator<TreeItem> theIterator = myChannelTree.treeItemIterator();
while(theIterator.hasNext()) {
TreeItem theTreeItem = theIterator.next();
//adds the channel if the channel doesn't already exists
if(aChannel.equals(theTreeItem.getText())) {
theIterator.remove();
theTreeItem.remove();
return true;
}
}
return false;
}
public boolean addContact(String aChannel, String aContactName) {
boolean isContactAdded = false;
final Iterator<TreeItem> theIterator = myChannelTree.treeItemIterator();
while(theIterator.hasNext()) {
TreeItem theChannelTreeItem = theIterator.next();
if(isChannelItem(theChannelTreeItem)) {
if(aChannel.equals(theChannelTreeItem.getText())) {
if(!containsContact(theChannelTreeItem, aContactName)) {
//adds the contact if the contact doesn't already exists in that channel
theChannelTreeItem.addItem(aContactName);
isContactAdded = true;
}
}
}
}
return isContactAdded;
}
public boolean removeContact(String aContactName) {
final Iterator<TreeItem> theIterator = myChannelTree.treeItemIterator();
while(theIterator.hasNext()) {
TreeItem theTreeItem = theIterator.next();
if(isChannelItem(theTreeItem)) {
if(containsContact(theTreeItem, aContactName)) {
return removeItem(theTreeItem, aContactName);
}
}
}
return false;
}
public Set<String> getContacts() {
Set<String> theContacts = new HashSet<String>();
final Iterator<TreeItem> theIterator = myChannelTree.treeItemIterator();
while(theIterator.hasNext()) {
TreeItem theChannelTreeItem = theIterator.next();
if(isChannelItem(theChannelTreeItem)) {
theContacts.addAll(getContacts(theChannelTreeItem));
}
}
return theContacts;
}
public void reset() {
myChannelTree.clear();
Iterator<HandlerRegistration> theHandlerRegistrationIterator = myHandlerRegistrations.iterator();
while(theHandlerRegistrationIterator.hasNext()) {
HandlerRegistration theHandlerRegistration = theHandlerRegistrationIterator.next();
theHandlerRegistration.removeHandler();
theHandlerRegistrationIterator.remove();
}
}
public void enable(boolean isEnable) {
myAddChannelButton.setEnabled(isEnable);
}
public HandlerRegistration addAddChannelButtonListener(ClickHandler aClickHandler) {
final HandlerRegistration theClickHandlerRegistration = myAddChannelButton.addClickHandler(aClickHandler);
myHandlerRegistrations.add(theClickHandlerRegistration);
return theClickHandlerRegistration;
}
public HandlerRegistration addChannelSelectListener(final ChannelSelectListener aChannelSelectListener) {
final SelectionHandler<TreeItem> theTreeSelectionHandler = new SelectionHandler<TreeItem>() {
public void onSelection(SelectionEvent<TreeItem> aSelectionEvent) {
final TreeItem theSelectedItem = aSelectionEvent.getSelectedItem();
if(isChannelItem(theSelectedItem)) {
final String theChannelName = theSelectedItem.getText();
aChannelSelectListener.onSelect(theChannelName);
}
}
};
final HandlerRegistration theSelectionHandlerRegistration = myChannelTree.addSelectionHandler(theTreeSelectionHandler);
myHandlerRegistrations.add(theSelectionHandlerRegistration);
return theSelectionHandlerRegistration;
}
private boolean isChannelItem(TreeItem aTreeItem) {
//the channels are at the first level (has no parent item)
return (aTreeItem.getParentItem() == null);
}
private boolean containsContact(TreeItem aParentItem, String aContact) {
Set<String> theContacts = getContacts(aParentItem);
return theContacts.contains(aContact);
}
private boolean removeItem(TreeItem aParentItem, String anEntry) {
for(int i = 0; i < aParentItem.getChildCount(); i++) {
final TreeItem theChild = aParentItem.getChild(i);
if(theChild != null) {
if(anEntry.equals(theChild.getText())) {
aParentItem.removeItem(theChild);
return true;
}
}
}
return false;
}
private Set<String> getContacts(TreeItem aChannelTreeItem) {
int theChildCount = aChannelTreeItem.getChildCount();
Set<String> theContacts = new HashSet<String>(theChildCount);
for(int i = 0; i < theChildCount; i++) {
theContacts.add(aChannelTreeItem.getChild(i).getText());
}
return theContacts;
}
}