Java tutorial
/* * Copyright (c) 2010-2013 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.data.paging; import com.evolveum.midpoint.web.component.util.VisibleEnableBehaviour; import org.apache.commons.lang.BooleanUtils; import org.apache.wicket.AttributeModifier; import org.apache.wicket.Component; import org.apache.wicket.ajax.AjaxRequestTarget; import org.apache.wicket.ajax.markup.html.AjaxLink; import org.apache.wicket.markup.html.WebMarkupContainer; import org.apache.wicket.markup.html.list.Loop; import org.apache.wicket.markup.html.list.LoopItem; import org.apache.wicket.markup.html.navigation.paging.IPageable; import org.apache.wicket.markup.html.panel.Panel; import org.apache.wicket.markup.repeater.AbstractRepeater; import org.apache.wicket.model.AbstractReadOnlyModel; import org.apache.wicket.model.IModel; /** * @author lazyman */ public class NavigatorPanel extends Panel { private int PAGING_SIZE = 5; private static final String ID_PREVIOUS = "previous"; private static final String ID_PREVIOUS_LINK = "previousLink"; private static final String ID_FIRST = "first"; private static final String ID_FIRST_LINK = "firstLink"; private static final String ID_LAST = "last"; private static final String ID_LAST_LINK = "lastLink"; // private static final String ID_DOTS = "dots"; private static final String ID_NAVIGATION = "navigation"; private static final String ID_PAGE_LINK = "pageLink"; private static final String ID_NEXT = "next"; private static final String ID_NEXT_LINK = "nextLink"; private final IPageable pageable; private final IModel<Boolean> showPageListingModel; public NavigatorPanel(String id, IPageable pageable, final boolean showPageListing) { this(id, pageable, new AbstractReadOnlyModel<Boolean>() { @Override public Boolean getObject() { return showPageListing; } }); } public NavigatorPanel(String id, IPageable pageable, IModel<Boolean> showPageListingModel) { super(id); this.pageable = pageable; this.showPageListingModel = showPageListingModel; setOutputMarkupId(true); add(new VisibleEnableBehaviour() { @Override public boolean isVisible() { return NavigatorPanel.this.pageable.getPageCount() > 0; } }); initLayout(); } private void initLayout() { initFirst(); initPrevious(); initNavigation(); initNext(); initLast(); } private void initPrevious() { WebMarkupContainer previous = new WebMarkupContainer(ID_PREVIOUS); previous.add(new AttributeModifier("class", new AbstractReadOnlyModel<String>() { @Override public String getObject() { return isPreviousEnabled() ? "" : "disabled"; } })); add(previous); AjaxLink previousLink = new AjaxLink(ID_PREVIOUS_LINK) { @Override public void onClick(AjaxRequestTarget target) { previousPerformed(target); } }; previousLink.add(new VisibleEnableBehaviour() { @Override public boolean isEnabled() { return isPreviousEnabled(); } }); previous.add(previousLink); } private void initFirst() { WebMarkupContainer first = new WebMarkupContainer(ID_FIRST); first.add(new AttributeModifier("class", new AbstractReadOnlyModel<String>() { @Override public String getObject() { return isFirstEnabled() ? "" : "disabled"; } })); add(first); AjaxLink firstLink = new AjaxLink(ID_FIRST_LINK) { @Override public void onClick(AjaxRequestTarget target) { firstPerformed(target); } }; firstLink.add(new VisibleEnableBehaviour() { @Override public boolean isEnabled() { return BooleanUtils.isTrue(showPageListingModel.getObject()) && isFirstEnabled(); } }); first.add(firstLink); } private void initNavigation() { IModel<Integer> model = new AbstractReadOnlyModel<Integer>() { @Override public Integer getObject() { int count = (int) pageable.getPageCount(); if (count < PAGING_SIZE) { return count; } return PAGING_SIZE; } }; Loop navigation = new Loop(ID_NAVIGATION, model) { @Override protected void populateItem(final LoopItem item) { final NavigatorPageLink pageLink = new NavigatorPageLink(ID_PAGE_LINK, computePageNumber(item.getIndex())) { @Override public void onClick(AjaxRequestTarget target) { pageLinkPerformed(target, getPageNumber()); } }; item.add(pageLink); item.add(new AttributeModifier("class", new AbstractReadOnlyModel<String>() { @Override public String getObject() { return pageable.getCurrentPage() == pageLink.getPageNumber() ? "active" : ""; } })); } }; navigation.add(new VisibleEnableBehaviour() { @Override public boolean isVisible() { return BooleanUtils.isTrue(showPageListingModel.getObject()); } }); add(navigation); } private long computePageNumber(int loopIndex) { long current = pageable.getCurrentPage(); long count = pageable.getPageCount(); final long half = PAGING_SIZE / 2; long result; if (current - half <= 0) { result = loopIndex; } else if (current + half + 1 >= count) { result = count - PAGING_SIZE + loopIndex; } else { result = current - half + loopIndex; } //TODO - this is just quick dirty fix for MID-1808. Fix algorithm later if (count == 4 && current == 3) { result++; } return result; } private void initNext() { WebMarkupContainer next = new WebMarkupContainer(ID_NEXT); next.add(new AttributeModifier("class", new AbstractReadOnlyModel<String>() { @Override public String getObject() { return isNextEnabled() ? "" : "disabled"; } })); add(next); AjaxLink nextLink = new AjaxLink(ID_NEXT_LINK) { @Override public void onClick(AjaxRequestTarget target) { nextPerformed(target); } }; nextLink.add(new VisibleEnableBehaviour() { @Override public boolean isEnabled() { return isNextEnabled(); } }); next.add(nextLink); } private void initLast() { WebMarkupContainer last = new WebMarkupContainer(ID_LAST); last.add(new AttributeModifier("class", new AbstractReadOnlyModel<String>() { @Override public String getObject() { return isLastEnabled() ? "" : "disabled"; } })); add(last); AjaxLink lastLink = new AjaxLink(ID_LAST_LINK) { @Override public void onClick(AjaxRequestTarget target) { lastPerformed(target); } }; lastLink.add(new VisibleEnableBehaviour() { @Override public boolean isEnabled() { return BooleanUtils.isTrue(showPageListingModel.getObject()) && isLastEnabled(); } }); last.add(lastLink); } private boolean isPreviousEnabled() { return pageable.getCurrentPage() > 0; } private boolean isNextEnabled() { return pageable.getCurrentPage() + 1 < pageable.getPageCount(); } private boolean isFirstEnabled() { return pageable.getCurrentPage() > 0; } private boolean isLastEnabled() { return pageable.getCurrentPage() + 1 < pageable.getPageCount(); } private void previousPerformed(AjaxRequestTarget target) { changeCurrentPage(target, pageable.getCurrentPage() - 1); } private void firstPerformed(AjaxRequestTarget target) { changeCurrentPage(target, 0); } private void lastPerformed(AjaxRequestTarget target) { changeCurrentPage(target, pageable.getPageCount() - 1); } private void nextPerformed(AjaxRequestTarget target) { changeCurrentPage(target, pageable.getCurrentPage() + 1); } private void changeCurrentPage(AjaxRequestTarget target, long page) { pageable.setCurrentPage(page); Component container = ((Component) pageable); while (container instanceof AbstractRepeater) { container = container.getParent(); } target.add(container); target.add(this); onPageChanged(target, page); } private void pageLinkPerformed(AjaxRequestTarget target, long page) { changeCurrentPage(target, page); } protected void onPageChanged(AjaxRequestTarget target, long page) { } }