org.sakaiproject.jsf2.renderer.PagerRenderer Maven / Gradle / Ivy

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/**********************************************************************************
Copyright (c) 2018 Apereo Foundation

Licensed under the Educational Community 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://opensource.org/licenses/ecl2

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.sakaiproject.jsf2.renderer;

import java.io.IOException;
import java.text.MessageFormat;
import java.util.Map;
import java.util.MissingResourceException;

import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;

import lombok.extern.slf4j.Slf4j;

import org.sakaiproject.jsf2.util.LocaleUtil;
import org.sakaiproject.jsf2.util.RendererUtil;

@Slf4j
public class PagerRenderer extends Renderer {

    private static final String BUNDLE_NAME = "pager";

    public void encodeBegin(FacesContext context, UIComponent component) throws IOException {
        if (!component.isRendered()) return;

        // get state

        ResponseWriter out = context.getResponseWriter();
        String clientId = component.getClientId(context);
        //String formId = getFormId(context, component);

        int pageSize = getInt(context, component, "pageSize", 0);
        int totalItems = getInt(context, component, "totalItems", 0);
        int firstItem = getInt(context, component, "firstItem", 0);
        int lastItem = getInt(context, component, "lastItem", -1);
        if (log.isDebugEnabled()) log.debug("encodeBegin: firstItem=" + firstItem + ", pageSize=" + pageSize + ", value=" + getString(context, component, "value", null));

        // in case we are rendering before decode()ing we need to adjust the states
        adjustState(context, component, firstItem, lastItem, pageSize, totalItems, firstItem, lastItem, pageSize);

        pageSize = getInt(context, component, "pageSize", 0);
        totalItems = getInt(context, component, "totalItems", 0);
        firstItem = getInt(context, component, "firstItem", 0);
        lastItem = getInt(context, component, "lastItem", -1);

        // get stuff for pageing buttons
        String idFirst = clientId+"_first";
        String idPrev = clientId+"_prev";
        String idNext = clientId+"_next";
        String idLast = clientId+"_last";
        String idPastItem = clientId+"_pastItem";
        boolean renderFirst = getBoolean(context, component, "renderFirst", true);
        boolean renderPrev = getBoolean(context, component, "renderPrev", true);
        boolean renderNext = getBoolean(context, component, "renderNext", true);
        boolean renderLast = getBoolean(context, component, "renderLast", true);
        boolean renderPageSize = getBoolean(context, component, "renderPageSize", true);
        String labelFirst = getString(context, component, "textFirst", "|<");
        String labelPrev = getString(context, component, "textPrev", "<");
        String labelNext = getString(context, component, "textNext", ">");
        String labelLast = getString(context, component, "textLast", ">|");
        String textItem = getString(context, component, "textItem", "items");
        String titleFirst = MessageFormat.format(getString(context, component, "titleFirst", "First {0} {1}"), pageSize, textItem);
        String titlePrev = MessageFormat.format(getString(context, component, "titlePrev", "Previous {0} {1}"), pageSize, textItem);
        String titleNext = MessageFormat.format(getString(context, component, "titleNext", "Next {0} {1}"), pageSize, textItem);
        String titleLast = MessageFormat.format(getString(context, component, "titleLast", "Last {0} {1}"), pageSize, textItem);

        // TODO: Do this elsewhere? (component vs renderer)
        boolean disabledFirst = (firstItem == 0);
        boolean disabledPrev = (firstItem == 0);
        boolean disabledNext = (pageSize == 0) || (firstItem + pageSize >= totalItems);
        boolean disabledLast = disabledNext;
        boolean accesskeys = getBoolean(context, component, "accesskeys", false);
        String accesskeyFirst = (accesskeys) ? "f" : null;
        String accesskeyPrev = (accesskeys) ? "p" : null;
        String accesskeyNext = (accesskeys) ? "n" : null;
        String accesskeyLast = (accesskeys) ? "l" : null;

        // get stuff for page size selection and display

        String textPageSize = getString(context, component, "textPageSize", "Show {0}");
        String textPageSizeAll = getString(context, component, "textPageSizeAll", "all");
        String pageSizesStr = getString(context, component, "pageSizes", "5,10,20,50,100");
        String[] pageSizes = pageSizesStr.split(",");
        String idSelect = clientId+"_pageSize";

        String textStatus;
        if (totalItems > 0) {
            textStatus = getString(context, component, "textStatus", "Viewing {0} to {1} of {2} {3}");
        } else {
            textStatus = getString(context, component, "textStatusZeroItems", "Viewing 0 {3}");
        }

        Object[] args = new Object[] {String.valueOf(firstItem+1), String.valueOf(lastItem), String.valueOf(totalItems), textItem};
        textStatus = MessageFormat.format(textStatus, args);

        // prepare the dropdown for selecting the
        // TODO: Probably need to cache this for performance
        String onchangeHandler = "javascript:this.form.submit(); return false;";
        String selectedValue = String.valueOf(pageSize);
        String[] optionTexts = new String[pageSizes.length+1];
        String[] optionValues = new String[pageSizes.length+1];
        for (int i=0; i 0) return str;

        return null;
    }
}