/*
* Copyright 2011 SWM Services GmbH.
*
* 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 de.swm.commons.mobile.client.widgets;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.EventTarget;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.Widget;
import de.swm.commons.mobile.client.SWMMobile;
import de.swm.commons.mobile.client.base.PanelBase;
import de.swm.commons.mobile.client.event.*;
import de.swm.commons.mobile.client.utils.Utils;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
/**
* Defines a group of check boxes.
*
*/
public class CheckBoxGroup extends PanelBase implements HasWidgets, ClickHandler, DragEventsHandler,
ValueChangeHandler<Boolean> {
private static final Logger LOGGER = Logger.getLogger(CheckBoxGroup.class.getName());
private int pressed = -1;
/**
* Default constructor.
*/
public CheckBoxGroup() {
super();
addDomHandler(this, ClickEvent.getType());
setStyleName(SWMMobile.getTheme().getMGWTCssBundle().getCheckRadioBoxCss().checkBoxGroup());
addStyleName(SWMMobile.getTheme().getMGWTCssBundle().getCheckRadioBoxCss().vertical());
}
@Override
public void onLoad() {
super.onLoad();
DragController.get().addDragEventsHandler(this);
}
@Override
protected void onUnload() {
super.onUnload();
DragController.get().removeDragEventsHandler(this);
}
/**
* Adds a selection changes handler to the checkboxgroup.
*
* @param handler
* the handler.
* @return handler registration to remove this handler.
*/
public HandlerRegistration addSelectionChangedHandler(SelectionChangedHandler handler) {
return this.addHandler(handler, SelectionChangedEvent.TYPE);
}
@Override
public void onClick(ClickEvent e) {
final EventTarget target = e.getNativeEvent().getEventTarget();
String targetTagName = ((Element) target.cast()).getTagName().toUpperCase();
LOGGER.info("onClick target " + targetTagName);
if (targetTagName.equals("LABEL") || targetTagName.equals("IMG")) {
return; // if check box label or image is clicked, another (simulated) click event with
// check box INPUT as target will fire after this one. So this click event
// must be ignored.
}
Element div = Element.as(target);
while (!div.getNodeName().toUpperCase().equals("SPAN") || div.getParentElement() != this.getElement()) {
div = div.getParentElement();
if (div == null) {
LOGGER.info("CheckBoxGroup onClick: span not found");
return;
}
}
final int index = DOM.getChildIndex(this.getElement(), (com.google.gwt.user.client.Element) div);
com.google.gwt.user.client.ui.CheckBox checkbox = (com.google.gwt.user.client.ui.CheckBox) myFlowPanel
.getWidget(index);
LOGGER.info("onClick " + checkbox.getValue());
if (targetTagName.equals("INPUT")) {
LOGGER.info("onClick value changed");
checkbox.setValue(checkbox.getValue()); // if target is check box INPUT, check box value is
// already changed when click event is fired.
// just need to set its current value back to the check box
// to update style.
} else {
checkbox.setValue(!checkbox.getValue());
}
Scheduler.get().scheduleDeferred(new ScheduledCommand() {
@Override
public void execute() {
SelectionChangedEvent selectionChangedEvent = new SelectionChangedEvent(index, target);
fireEvent(selectionChangedEvent);
}
});
}
/**
* Returns the checked check box indices.
*
* @return the checked check box indices.
*/
public List<Integer> getCheckedIndices() {
ArrayList<Integer> checkedList = new ArrayList<Integer>(myFlowPanel.getWidgetCount());
for (int i = 0; i < myFlowPanel.getWidgetCount(); i++) {
com.google.gwt.user.client.ui.CheckBox radio = (com.google.gwt.user.client.ui.CheckBox) myFlowPanel.getWidget(i);
if (radio.getValue()) {
checkedList.add(i);
}
}
return checkedList;
}
/**
* Returns the checked check box widgets. All widgets are instances of
* {@link com.google.gwt.user.client.ui.CheckBox}
*
* @return the checked check box widgets.
*/
public List<Widget> getCheckedWidgets() {
ArrayList<Widget> checkedList = new ArrayList<Widget>(myFlowPanel.getWidgetCount());
for (int i = 0; i < myFlowPanel.getWidgetCount(); i++) {
com.google.gwt.user.client.ui.CheckBox radio = (com.google.gwt.user.client.ui.CheckBox) myFlowPanel.getWidget(i);
if (radio.getValue()) {
checkedList.add(radio);
}
}
return checkedList;
}
@Override
public void add(Widget w) {
assert w instanceof CheckBox : "Can only contain CheckBox widgets in CheckBoxGroup";
CheckBox checkbox = (CheckBox) w;
myFlowPanel.add(checkbox);
checkbox.addValueChangeHandler(this);
}
/**
* Will display the check box group vertical or horizontal.
*
* @param vertical true if vertical
*/
public void setVertical(boolean vertical) {
if (vertical) {
addStyleName(SWMMobile.getTheme().getMGWTCssBundle().getCheckRadioBoxCss().vertical());
removeStyleName(SWMMobile.getTheme().getMGWTCssBundle().getCheckRadioBoxCss().horizontal());
} else {
addStyleName(SWMMobile.getTheme().getMGWTCssBundle().getCheckRadioBoxCss().horizontal());
removeStyleName(SWMMobile.getTheme().getMGWTCssBundle().getCheckRadioBoxCss().vertical());
}
}
@Override
public void onValueChange(ValueChangeEvent<Boolean> event) {
LOGGER.info("onValueChange " + event.getValue() + " " + event.getSource().getClass());
}
@Override
public void onDragStart(DragEvent e) {
pressed = Utils.getTargetItemIndex(getElement(), e.getNativeEvent().getEventTarget());
if (pressed >= 0) {
Widget item = getWidget(pressed);
item.addStyleName(SWMMobile.getTheme().getMGWTCssBundle().getCheckRadioBoxCss().pressed());
}
}
@Override
public void onDragMove(DragEvent e) {
if (pressed >= 0) {
Widget item = getWidget(pressed);
item.removeStyleName(SWMMobile.getTheme().getMGWTCssBundle().getCheckRadioBoxCss().pressed());
pressed = -1;
}
}
@Override
public void onDragEnd(DragEvent e) {
onDragMove(e);
}
}