/*
* Copyright (c) 2010-2016 Evolveum
*
* 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.evolveum.midpoint.web.component.form.multivalue;
import com.evolveum.midpoint.gui.api.component.BasePanel;
import com.evolveum.midpoint.gui.api.model.NonEmptyModel;
import com.evolveum.midpoint.gui.api.util.WebComponentUtil;
import com.evolveum.midpoint.web.component.util.VisibleEnableBehaviour;
import org.apache.commons.lang3.StringUtils;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.behavior.AttributeAppender;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.markup.html.form.IChoiceRenderer;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.model.AbstractReadOnlyModel;
import org.apache.wicket.model.IModel;
import java.io.Serializable;
import java.util.*;
/**
* @author shood
* */
public class MultiValueDropDownPanel<T extends Serializable> extends BasePanel<List<T>>{
private static final String ID_PLACEHOLDER_CONTAINER = "placeholderContainer";
private static final String ID_PLACEHOLDER_ADD = "placeholderAdd";
private static final String ID_REPEATER = "repeater";
private static final String ID_INPUT = "input";
private static final String ID_BUTTON_GROUP = "buttonGroup";
private static final String ID_ADD = "add";
private static final String ID_REMOVE = "delete";
private static final String CSS_DISABLED = " disabled";
public MultiValueDropDownPanel(String id, IModel<List<T>> model, boolean nullValid, NonEmptyModel<Boolean> readOnlyModel) {
super(id, model);
setOutputMarkupId(true);
initLayout(nullValid, readOnlyModel);
}
private void initLayout(final boolean nullValid, final NonEmptyModel<Boolean> readOnlyModel) {
WebMarkupContainer placeholderContainer = new WebMarkupContainer(ID_PLACEHOLDER_CONTAINER);
placeholderContainer.setOutputMarkupPlaceholderTag(true);
placeholderContainer.setOutputMarkupPlaceholderTag(true);
placeholderContainer.add(new VisibleEnableBehaviour(){
@Override
public boolean isVisible() {
return getModel().getObject().isEmpty();
}
});
add(placeholderContainer);
AjaxLink placeholderAdd = new AjaxLink(ID_PLACEHOLDER_ADD) {
@Override
public void onClick(AjaxRequestTarget target) {
addValuePerformed(target);
}
};
placeholderAdd.add(new AttributeAppender("class", new AbstractReadOnlyModel<String>() {
@Override
public String getObject() {
if (buttonsDisabled()) {
return " " + CSS_DISABLED;
}
return "";
}
}));
placeholderAdd.setOutputMarkupId(true);
placeholderAdd.setOutputMarkupPlaceholderTag(true);
placeholderAdd.add(WebComponentUtil.visibleIfFalse(readOnlyModel));
placeholderContainer.add(placeholderAdd);
ListView repeater = new ListView<T>(ID_REPEATER, getModel()){
@Override
protected void populateItem(final ListItem<T> item) {
DropDownChoice choice = new DropDownChoice<>(ID_INPUT, createDropDownItemModel(item.getModel()),
createChoiceList(), createRenderer());
choice.setNullValid(nullValid);
choice.add(WebComponentUtil.enabledIfFalse(readOnlyModel));
item.add(choice);
WebMarkupContainer buttonGroup = new WebMarkupContainer(ID_BUTTON_GROUP);
item.add(buttonGroup);
initButtons(buttonGroup, item, readOnlyModel);
}
};
repeater.setOutputMarkupId(true);
repeater.setOutputMarkupPlaceholderTag(true);
repeater.add(new VisibleEnableBehaviour(){
@Override
public boolean isVisible() {
return !getModel().getObject().isEmpty();
}
});
add(repeater);
}
protected IModel<T> createDropDownItemModel(final IModel<T> model) {
return new IModel<T>() {
@Override
public T getObject() {
T obj = model.getObject();
return obj != null ? obj : null;
}
@Override
public void setObject(T object) {
model.setObject(object);
}
@Override
public void detach() {
}
};
}
private void initButtons(WebMarkupContainer buttonGroup, final ListItem<T> item, NonEmptyModel<Boolean> readOnlyModel) {
AjaxLink add = new AjaxLink(ID_ADD) {
@Override
public void onClick(AjaxRequestTarget target) {
addValuePerformed(target);
}
};
add.add(new AttributeAppender("class", getPlusClassModifier(item)));
add.add(WebComponentUtil.visibleIfFalse(readOnlyModel));
buttonGroup.add(add);
AjaxLink remove = new AjaxLink(ID_REMOVE) {
@Override
public void onClick(AjaxRequestTarget target) {
removeValuePerformed(target, item);
}
};
remove.add(new AttributeAppender("class", getMinusClassModifier()));
remove.add(WebComponentUtil.visibleIfFalse(readOnlyModel));
buttonGroup.add(remove);
}
protected T createNewEmptyItem(){
return null;
}
protected String getPlusClassModifier(ListItem<T> item){
if(buttonsDisabled()){
return CSS_DISABLED;
}
int size = getModelObject().size();
if (size <= 1) {
return "";
}
if (item.getIndex() == size - 1) {
return "";
}
return CSS_DISABLED;
}
protected String getMinusClassModifier(){
if(buttonsDisabled()){
return CSS_DISABLED;
}
return "";
}
protected void addValuePerformed(AjaxRequestTarget target){
List<T> objects = getModelObject();
objects.add(createNewEmptyItem());
target.add(this);
}
protected void removeValuePerformed(AjaxRequestTarget target, ListItem<T> item){
List<T> objects = getModelObject();
Iterator<T> iterator = objects.iterator();
while (iterator.hasNext()) {
T object = iterator.next();
if (object.equals(item.getModelObject())) {
iterator.remove();
break;
}
}
target.add(this);
}
/**
* Provide a function to determine if buttons of editor are disabled/enabled
* */
protected boolean buttonsDisabled(){
return false;
}
/**
* Provides list of choices for drop-down component
* */
protected IModel<List<T>> createChoiceList(){
return new AbstractReadOnlyModel<List<T>>() {
@Override
public List<T> getObject() {
return new ArrayList<>();
}
};
}
/**
* Provides an instance of IChoiceRenderer needed to render choices in drop-down component
* */
protected IChoiceRenderer<T> createRenderer(){
return new IChoiceRenderer<T>() {
@Override
public T getObject(String id, IModel<? extends List<? extends T>> choices) {
return StringUtils.isNotBlank(id) ? choices.getObject().get(Integer.parseInt(id)) : null;
}
@Override
public Object getDisplayValue(T object) {
return object.toString();
}
@Override
public String getIdValue(T object, int index) {
return Integer.toString(index);
}
};
}
}