/*
* Copyright (c) 2011 Lockheed Martin Corporation
*
* Licensed 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.eurekastreams.web.client.ui.common.dialog.lookup;
import java.util.List;
import org.eurekastreams.server.action.request.PersonLookupRequest;
import org.eurekastreams.server.search.modelview.PersonModelView;
import org.eurekastreams.web.client.events.EventBus;
import org.eurekastreams.web.client.events.Observer;
import org.eurekastreams.web.client.events.data.GotPersonLookupResponseEvent;
import org.eurekastreams.web.client.model.Fetchable;
import org.eurekastreams.web.client.ui.pages.master.StaticResourceBundle;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.Widget;
/**
* Manages state and logic for the Employee Lookup control (adapted from MVVM pattern).
*/
public class EmployeeLookupViewModel
{
/** The maximum number of results to display. */
private static final int MAX_RESULTS = 50;
/** The view. */
private final EmployeeLookupContent view;
/** The model. */
private final Fetchable<PersonLookupRequest> model;
/** The event bus. */
private final EventBus eventBus;
/** Currently-selected person. */
private PersonModelView selectedPerson;
/** List of people returned from the last query. */
private List<PersonModelView> people;
/**
* Constructor.
*
* @param inView
* The view.
* @param inModel
* The model.
* @param inEventBus
* The event bus.
*/
public EmployeeLookupViewModel(final EmployeeLookupContent inView, final Fetchable<PersonLookupRequest> inModel,
final EventBus inEventBus)
{
view = inView;
model = inModel;
eventBus = inEventBus;
}
/**
* Initialize.
*/
public void init()
{
// user clicked search button
view.getSearch().addClickHandler(new ClickHandler()
{
public void onClick(final ClickEvent inArg0)
{
String searchText = view.getLastName().getText();
if (!searchText.isEmpty())
{
model.fetch(new PersonLookupRequest(searchText, MAX_RESULTS + 1), true);
}
}
});
// user pressed a key
view.getLastName().addKeyUpHandler(new KeyUpHandler()
{
public void onKeyUp(final KeyUpEvent ev)
{
String searchText = view.getLastName().getText();
boolean anyText = !searchText.isEmpty();
setSearchButtonStatus(anyText);
if (anyText && ev.getNativeKeyCode() == KeyCodes.KEY_ENTER && !ev.isAnyModifierKeyDown())
{
model.fetch(new PersonLookupRequest(searchText, MAX_RESULTS + 1), true);
}
}
});
// user selected a person in the list
view.getResults().addChangeHandler(new ChangeHandler()
{
public void onChange(final ChangeEvent ev)
{
selectedPerson = null;
if (people != null)
{
final int selectedIndex = view.getResults().getSelectedIndex();
if (selectedIndex >= 0 && selectedIndex < people.size())
{
selectedPerson = people.get(selectedIndex);
}
}
updateOnPersonSelected();
}
});
// user clicked the select button
view.getSelect().addClickHandler(new ClickHandler()
{
public void onClick(final ClickEvent inArg0)
{
if (selectedPerson != null)
{
view.close();
view.getSaveCommand().execute();
}
}
});
// received query results from server
eventBus.addObserver(GotPersonLookupResponseEvent.class, new Observer<GotPersonLookupResponseEvent>()
{
public void update(final GotPersonLookupResponseEvent ev)
{
people = ev.getResponse();
int count;
String message;
if (people.size() > MAX_RESULTS)
{
count = MAX_RESULTS;
message = "Greater than " + MAX_RESULTS + " results.";
}
else
{
count = people.size();
message = "Displaying " + count + " matches";
}
view.getResultsDesc().setText(message);
ListBox results = view.getResults();
results.clear();
for (int i = 0; i < count; i++)
{
PersonModelView person = people.get(i);
results.addItem(person.getLastName() + ", " + person.getPreferredName(), person.getAccountId());
}
if (count == 1)
{
results.setItemSelected(0, true);
selectedPerson = people.get(0);
}
else
{
selectedPerson = null;
}
updateOnPersonSelected();
}
});
}
/**
* @return The selected person.
*/
public PersonModelView getSelectedPerson()
{
return selectedPerson;
}
/**
* Updates the view to reflect the currently-selected person.
*/
private void updateOnPersonSelected()
{
view.showSelectedPerson(selectedPerson);
Widget select = view.getSelect();
if (selectedPerson != null)
{
select.removeStyleName(StaticResourceBundle.INSTANCE.coreCss().lookupSelectButtonInactive());
select.addStyleName(StaticResourceBundle.INSTANCE.coreCss().lookupSelectButtonActive());
}
else
{
select.removeStyleName(StaticResourceBundle.INSTANCE.coreCss().lookupSelectButtonActive());
select.addStyleName(StaticResourceBundle.INSTANCE.coreCss().lookupSelectButtonInactive());
}
}
/**
* Sets the enabled/disabled state of the search button.
*
* @param active
* If new state is active.
*/
private void setSearchButtonStatus(final boolean active)
{
Widget search = view.getSearch();
if (active)
{
search.removeStyleName(StaticResourceBundle.INSTANCE.coreCss().lookupSelectButtonInactive());
search.addStyleName(StaticResourceBundle.INSTANCE.coreCss().lookupSelectButtonActive());
}
else
{
search.removeStyleName(StaticResourceBundle.INSTANCE.coreCss().lookupSelectButtonActive());
search.addStyleName(StaticResourceBundle.INSTANCE.coreCss().lookupSelectButtonInactive());
}
}
}