pagenext.java

来自「Java生成PDF Java生成PDF Java生成PDF」· Java 代码 · 共 45 行

// $Id: PageNext.java,v 1.10 2007/11/05 14:54:57 mike Exp $

package org.faceless.pdf2.viewer2.feature;

import org.faceless.pdf2.viewer2.*;
import org.faceless.pdf2.PDFPage;
import javax.swing.*;

/**
 * Create a button to jump to the next page.
 * The name of this feature is "PageNext".
 * <p><i>This code is copyright the Big Faceless Organization. You're welcome to use, modify and distribute it in any form in your own projects, provided those projects continue to make use of the Big Faceless PDF library.</i></p>
 * @since 2.8
 */
public class PageNext extends ViewerWidget implements DocumentPanelListener
{
    public PageNext() {
        super("PageNext");
        setButton("Navigation", "resources/icons/NextPage.png", "tt.PageNext");
        setMenu("View\tGoTo\tNextPage");
    }

    public void action(ViewerEvent event) {
        PDFPage page = event.getDocumentPanel().getViewport().getRenderingPage();
        int pagenumber = page==null ? 0 : page.getPageNumber();
        JTextField field = (JTextField)event.getViewer().getNamedComponent("PageNumber");
        field.setText(Integer.toString(pagenumber+1));
        field.postActionEvent();
    }

    public void initialize(PDFViewer viewer) {
        super.initialize(viewer);
        viewer.addDocumentPanelListener(this);
    }

    public void documentUpdated(DocumentPanelEvent event) {
        if (event.getType()=="redrawn" || event.getType()=="activated") {
            int pagenumber = event.getDocumentPanel().getPageNumber();
            boolean last = pagenumber < event.getDocumentPanel().getPDF().getNumberOfPages()-1;
            event.getDocumentPanel().getViewer().getNamedComponent("ButtonPageNext").setEnabled(last);
            event.getDocumentPanel().getViewer().getNamedComponent("MenuPageNext").setEnabled(last);
        }
    }
}