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/*
* Copyright 2000-2022 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.v7.client.ui;
import java.util.ArrayList;
import java.util.List;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.user.client.ui.ListBox;
import com.vaadin.client.BrowserInfo;
import com.vaadin.client.UIDL;
public class VNativeSelect extends VOptionGroupBase {
public static final String CLASSNAME = "v-select";
protected ListBox select;
private boolean firstValueIsTemporaryNullItem = false;
public VNativeSelect() {
super(new ListBox(false), CLASSNAME);
select = getOptionsContainer();
select.setVisibleItemCount(1);
select.addChangeHandler(this);
select.setStyleName(CLASSNAME + "-select");
updateEnabledState();
}
protected ListBox getOptionsContainer() {
return (ListBox) optionsContainer;
}
@Override
public void buildOptions(UIDL uidl) {
select.clear();
firstValueIsTemporaryNullItem = false;
if (isNullSelectionAllowed() && !isNullSelectionItemAvailable()) {
// can't unselect last item in singleselect mode
select.addItem("", (String) null);
}
boolean selected = false;
for (final Object child : uidl) {
final UIDL optionUidl = (UIDL) child;
select.addItem(optionUidl.getStringAttribute("caption"),
optionUidl.getStringAttribute("key"));
if (optionUidl.hasAttribute("selected")) {
select.setItemSelected(select.getItemCount() - 1, true);
selected = true;
}
}
if (!selected && !isNullSelectionAllowed()) {
// null-select not allowed, but value not selected yet; add null and
// remove when something is selected
select.insertItem("", (String) null, 0);
select.setItemSelected(0, true);
firstValueIsTemporaryNullItem = true;
}
}
@Override
protected String[] getSelectedItems() {
final List<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) {
if (select.isMultipleSelect()) {
client.updateVariable(paintableId, "selected", getSelectedItems(),
isImmediate());
} else {
client.updateVariable(paintableId, "selected",
new String[] { "" + getSelectedItem() }, isImmediate());
}
if (firstValueIsTemporaryNullItem) {
// remove temporary empty item
select.removeItem(0);
firstValueIsTemporaryNullItem = false;
/*
* Workaround to achrome bug that may cause value change event not
* to fire when selection is done with keyboard.
*
* http://dev.vaadin.com/ticket/10109
*
* Problem is confirmed to exist only on Chrome-Win, but just
* execute in for all webkits. Probably exists also in other
* webkits/blinks on windows.
*/
if (BrowserInfo.get().isWebkit()) {
select.getElement().blur();
select.getElement().focus();
}
}
}
@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);
}
/**
* @return the root select widget
*/
public ListBox getSelect() {
return getOptionsContainer();
}
}
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