/*
* Copyright (c) 2010 Zhihua (Dennis) Jiang
*
* 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 com.gwtmobile.ui.client.widgets;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Widget;
import com.gwtmobile.ui.client.event.DragController;
import com.gwtmobile.ui.client.event.DragEvent;
import com.gwtmobile.ui.client.event.DragEventsHandler;
import com.gwtmobile.ui.client.event.SelectionChangedEvent;
import com.gwtmobile.ui.client.event.SelectionChangedHandler;
import com.gwtmobile.ui.client.utils.Utils;
public class ListPanel extends PanelBase implements ClickHandler, DragEventsHandler{
private boolean _showArrow;
private int _selected = -1;
private boolean _selectable = true;
public ListPanel() {
addDomHandler(this, ClickEvent.getType());
setStyleName("ListPanel");
}
public HandlerRegistration addSelectionChangedHandler(SelectionChangedHandler handler) {
return this.addHandler(handler, SelectionChangedEvent.TYPE);
}
@Override
public void onLoad() {
super.onLoad();
DragController.get().addDragEventsHandler(this);
}
@Override
public void onUnload() {
DragController.get().removeDragEventsHandler(this);
}
@Override
public void add(Widget w) {
if (w.getClass().toString().endsWith(".ListItem")) {
super.add(w);
}
else {
ListItem listItem = new ListItem();
super.add(listItem);
listItem.add(w);
if (_showArrow) {
Chevron chevron = new Chevron();
listItem.add(chevron);
}
}
}
@Override
public void onClick(ClickEvent e) {
if (_selected >= 0) {
ListItem item = (ListItem) getWidget(_selected);
if (!item.getDisabled()) {
SelectionChangedEvent selectionChangedEvent = new SelectionChangedEvent(_selected,
e.getNativeEvent().getEventTarget());
this.fireEvent(selectionChangedEvent);
item.removeStyleName("Pressed");
}
_selected = -1;
}
}
public void setShowArrow(boolean show) {
_showArrow = show;
for (int i = 0; i < getWidgetCount(); i++) {
ListItem listItem = (ListItem) getWidget(i);
listItem.setShowArrowFromParent(show);
}
}
public boolean getShowArrow() {
return _showArrow;
}
public void setSelectable(boolean selectable) {
_selectable = selectable;
}
public boolean getSelectable() {
return _selectable;
}
@Override
public void onDragStart(DragEvent e) {
if (_selectable) {
_selected = Utils.getTargetItemIndex(getElement(), e.getNativeEvent().getEventTarget());
if (_selected >= 0) {
new Timer() {
@Override
public void run() {
if (_selected >= 0) {
ListItem item = (ListItem) getWidget(_selected);
if (!item.getDisabled()) {
getWidget(_selected).addStyleName("Pressed");
}
}
}
}.schedule(75);
}
}
}
@Override
public void onDragMove(DragEvent e) {
if (_selected >= 0) {
getWidget(_selected).removeStyleName("Pressed");
_selected = -1;
}
}
@Override
public void onDragEnd(DragEvent e) {
if (_selected >= 0) {
getWidget(_selected).removeStyleName("Pressed");
//_selected = -1; need to keep the selected value for click event.
}
}
public ListItem getItem(int index) {
return (ListItem) getWidget(index);
}
static class Chevron extends HTML {
public Chevron() {
super("<div class=\"Chevron\"><span></span><span></span></div>");
}
}
}