/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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.vaadin.client.ui;
import java.util.ArrayList;
import java.util.Iterator;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.user.client.ui.ListBox;
import com.vaadin.client.UIDL;
public class VListSelect extends VOptionGroupBase {
public static final String CLASSNAME = "v-select";
private static final int VISIBLE_COUNT = 10;
protected ListBox select;
private int lastSelectedIndex = -1;
public VListSelect() {
super(new ListBox(true), CLASSNAME);
select = getOptionsContainer();
select.addChangeHandler(this);
select.addClickHandler(this);
select.setVisibleItemCount(VISIBLE_COUNT);
setStyleName(CLASSNAME);
updateEnabledState();
}
@Override
public void setStyleName(String style) {
super.setStyleName(style);
updateStyleNames();
}
@Override
public void setStylePrimaryName(String style) {
super.setStylePrimaryName(style);
updateStyleNames();
}
protected void updateStyleNames() {
container.setStyleName(getStylePrimaryName());
select.setStyleName(getStylePrimaryName() + "-select");
}
protected ListBox getOptionsContainer() {
return (ListBox) optionsContainer;
}
@Override
public void buildOptions(UIDL uidl) {
int scrollTop = select.getElement().getScrollTop();
int rowCount = getRows();
select.setMultipleSelect(isMultiselect());
select.clear();
if (!isMultiselect() && isNullSelectionAllowed()
&& !isNullSelectionItemAvailable()) {
// can't unselect last item in singleselect mode
select.addItem("", (String) null);
}
for (final Iterator<?> i = uidl.getChildIterator(); i.hasNext();) {
final UIDL optionUidl = (UIDL) i.next();
select.addItem(optionUidl.getStringAttribute("caption"),
optionUidl.getStringAttribute("key"));
if (optionUidl.hasAttribute("selected")) {
int itemIndex = select.getItemCount() - 1;
select.setItemSelected(itemIndex, true);
lastSelectedIndex = itemIndex;
}
}
if (getRows() > 0) {
select.setVisibleItemCount(getRows());
}
// FIXME: temporary hack for preserving the scroll state when the
// contents haven't been changed obviously. This should be dealt with in
// the rewrite.
if (rowCount == getRows()) {
select.getElement().setScrollTop(scrollTop);
}
}
@Override
protected String[] getSelectedItems() {
final ArrayList<String> selectedItemKeys = new ArrayList<String>();
for (int i = 0; i < select.getItemCount(); i++) {
if (select.isItemSelected(i)) {
selectedItemKeys.add(select.getValue(i));
}
}
return selectedItemKeys.toArray(new String[selectedItemKeys.size()]);
}
@Override
public void onChange(ChangeEvent event) {
final int si = select.getSelectedIndex();
if (si == -1 && !isNullSelectionAllowed()) {
select.setSelectedIndex(lastSelectedIndex);
} else {
lastSelectedIndex = si;
if (isMultiselect()) {
client.updateVariable(paintableId, "selected",
getSelectedItems(), isImmediate());
} else {
client.updateVariable(paintableId, "selected",
new String[] { "" + getSelectedItem() }, isImmediate());
}
}
}
@Override
public void setHeight(String height) {
select.setHeight(height);
super.setHeight(height);
}
@Override
public void setWidth(String width) {
select.setWidth(width);
super.setWidth(width);
}
@Override
public void setTabIndex(int tabIndex) {
getOptionsContainer().setTabIndex(tabIndex);
}
@Override
protected void updateEnabledState() {
select.setEnabled(isEnabled() && !isReadonly());
}
@Override
public void focus() {
select.setFocus(true);
}
}