org.opensingular.lib.wicket.util.datatable.BSPaginationPanel Maven / Gradle / Ivy
/*
* Copyright (C) 2016 Singular Studios (a.k.a Atom Tecnologia) - www.opensingular.com
*
* 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 org.opensingular.lib.wicket.util.datatable;
import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.link.AbstractLink;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.markup.html.navigation.paging.IPageableItems;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.markup.repeater.Item;
import org.apache.wicket.markup.repeater.RefreshingView;
import org.apache.wicket.model.IModel;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import static org.opensingular.lib.wicket.util.util.WicketUtils.$b;
import static org.opensingular.lib.wicket.util.util.WicketUtils.$m;
public class BSPaginationPanel extends Panel {
private final IPageableItems pageable;
public BSPaginationPanel(String id, P pageable) {
super(id);
this.pageable = pageable;
add(new OffsetLink("previous", getPageable(), -1));
add(new FirstLink("first", getPageable()));
add(new WebMarkupContainer("firstEllipse")
.add($b.visibleIf($m.get(() -> (getCurrentPage() - getMiddlePagesRadius()) > 1))));
add(new RefreshingView("pages") {
@Override
protected Iterator> getItemModels() {
return getMiddlePagesRange().stream().map($m::ofValue).map(m -> (IModel)m).iterator();
}
@Override
protected void populateItem(Item item) {
item
.add(newNumberedPageLink(item))
.add($b.classAppender("active", $m.get(() -> item.getModelObject() == getCurrentPage())));
}
});
add(new WebMarkupContainer("lastEllipse")
.add($b.visibleIf($m.get(() -> (getCurrentPage() + getMiddlePagesRadius()) < getLastPage() - 1))));
add(new LastLink("last", getPageable()));
add(new OffsetLink("next", getPageable(), +1));
}
protected NumberedPageLink newNumberedPageLink(ListItem item) {
NumberedPageLink link = new NumberedPageLink("page", getPageable(), item.getModel());
link.setBody($m.get(() -> 1 + item.getModelObject()));
return link;
}
@SuppressWarnings("unchecked")
public P getPageable() {
return (P) pageable;
}
@Override
protected void onComponentTag(ComponentTag tag) {
super.onComponentTag(tag);
checkComponentTag(tag, "nav");
}
private int getMiddlePagesRadius() {
return 2;
}
private List getMiddlePagesRange() {
long rangeLength = Math.min(1 + (getMiddlePagesRadius() * 2L), getPageCount());
List list = new ArrayList<>();
long start = Math.min(Math.max(0, getCurrentPage() - getMiddlePagesRadius()), getPageCount() - rangeLength);
for (long i = 0; i < rangeLength; i++)
list.add(start++);
return list;
}
private long getLastPage() {
return getPageCount() - 1;
}
private long getPageCount() {
return getPageable().getPageCount();
}
private long getCurrentPage() {
return getPageable().getCurrentPage();
}
private final class LastLink extends PageNavLink {
private LastLink(String id, P pageable) {
super(id, pageable);
setBody($m.get(() -> getLastPage() + 1));
}
@Override
protected long getTargetPage() {
return getLastPage();
}
@Override
protected boolean isLinkVisible() {
return !getMiddlePagesRange().contains(getTargetPage());
}
}
private final class FirstLink extends PageNavLink {
private
FirstLink(String id, P pageable) {
super(id, pageable);
}
@Override
protected long getTargetPage() {
return 0;
}
@Override
protected boolean isLinkVisible() {
return !getMiddlePagesRange().contains(getTargetPage());
}
}
private final class OffsetLink extends PageNavLink {
private final int pageDelta;
private
OffsetLink(String id, P pageable, int pageDelta) {
super(id, pageable);
this.pageDelta = pageDelta;
}
@Override
protected long getTargetPage() {
return this.getPageable().getCurrentPage() + ((long) pageDelta);
}
@Override
public boolean isEnabledInHierarchy() {
return super.isEnabledInHierarchy() && (getTargetPage() >= 0) && (getTargetPage() <= getLastPage());
}
}
public static final class NumberedPageLink extends PageNavLink {
private final IModel pageIndex;
private NumberedPageLink(String id, P pageable, IModel pageIndex) {
super(id, pageable);
this.pageIndex = pageIndex;
}
@Override
protected long getTargetPage() {
return pageIndex.getObject();
}
}
private static abstract class PageNavLink extends AjaxLink {
private final IPageableItems pageable;
private PageNavLink(String id, P pageable) {
super(id);
this.pageable = pageable;
}
protected abstract long getTargetPage();
protected boolean isLinkVisible() {
return true;
}
protected IPageableItems getPageable() { return pageable; }
protected Component getPageableComponent() { return (Component) getPageable(); }
@Override
public void onClick(AjaxRequestTarget target) {
if (isEnabledInHierarchy()) {
getPageable().setCurrentPage(getTargetPage());
target.add(getPageableComponent());
}
}
@Override
protected void onConfigure() {
super.onConfigure();
setVisible(isLinkVisible());
setEnabled(pageable.getCurrentPage() != getTargetPage());
}
}
}