org.cruxframework.crux.widgets.client.paging.SequentialPager.java Source code

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Here is the source code for org.cruxframework.crux.widgets.client.paging.SequentialPager.java

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/*
 * Copyright 2014 cruxframework.org.
 * 
 * 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.cruxframework.crux.widgets.client.paging;

import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.SimplePanel;

/**
 * A pager which does not know the total number of pages. So, it can only move the cursor to next or to previous page.  
 * @author Gesse S. F. Dafe
 */
public class SequentialPager extends NavigationButtonsPager {
    private HorizontalPanel panel;
    private SimplePanel infoPanel;

    /**
     * Constructor
     */
    public SequentialPager() {
        this.panel = new HorizontalPanel();
        this.panel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
        this.panel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
        this.infoPanel = new SimplePanel();
        this.infoPanel.setWidget(createCurrentPageLabel("" + 0));

        this.panel.add(createPreviousButton());
        this.panel.add(infoPanel);
        this.panel.add(createNextButton());

        this.panel.setStyleName("crux-SequentialPager");

        initWidget(this.panel);
    }

    @Override
    protected void onUpdate() {
        Label currentPageLabel = createCurrentPageLabel("" + getCurrentPage());
        this.infoPanel.clear();
        this.infoPanel.add(currentPageLabel);
    }

    /**
     * @see org.cruxframework.crux.widgets.client.paging.AbstractPager#showLoading()
     */
    @Override
    protected void showLoading() {
        this.infoPanel.clear();
        this.infoPanel.add(createCurrentPageLabel("..."));
    }

    /**
     * @see org.cruxframework.crux.widgets.client.paging.AbstractPager#hideLoading()
     */
    @Override
    protected void hideLoading() {
        // does nothing
    }

    /**
     * Creates the label that shows the current showing page
     * @param currentPageNumber
     * @return
     */
    private Label createCurrentPageLabel(String currentPageNumber) {
        Label label = new Label(currentPageNumber);
        label.setStyleName("currentPageLabel");
        return label;
    }
}