package com.stylefeng.guns.modular.system.util.itextpdf;
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import com.itextpdf.kernel.colors.WebColors;
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import com.itextpdf.kernel.events.Event;
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import com.itextpdf.kernel.events.IEventHandler;
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import com.itextpdf.kernel.events.PdfDocumentEvent;
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import com.itextpdf.kernel.font.PdfFont;
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import com.itextpdf.kernel.font.PdfFontFactory;
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import com.itextpdf.kernel.geom.Rectangle;
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import com.itextpdf.kernel.pdf.PdfDocument;
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import com.itextpdf.kernel.pdf.PdfPage;
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import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
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import com.itextpdf.layout.Canvas;
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import com.itextpdf.layout.element.Paragraph;
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import com.itextpdf.layout.property.TextAlignment;
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import com.itextpdf.layout.property.VerticalAlignment;
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import java.io.IOException;
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/**
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* @author zhibing.pu
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* @Date 2023/8/14 11:15
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*/
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public class WaterMarkEventHandler implements IEventHandler {
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/**
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* 水印内容
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*/
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private String waterMarkContent;
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/**
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* 一页中有几列水印
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*/
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private int waterMarkX;
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/**
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* 一页中每列有多少水印
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*/
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private int waterMarkY;
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public WaterMarkEventHandler(String waterMarkContent) {
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this(waterMarkContent, 5, 5);
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}
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public WaterMarkEventHandler(String waterMarkContent, int waterMarkX, int waterMarkY) {
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this.waterMarkContent = waterMarkContent;
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this.waterMarkX = waterMarkX;
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this.waterMarkY = waterMarkY;
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}
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@Override
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public void handleEvent(Event event) {
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PdfDocumentEvent documentEvent = (PdfDocumentEvent) event;
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PdfDocument document = documentEvent.getDocument();
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PdfPage page = documentEvent.getPage();
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Rectangle pageSize = page.getPageSize();
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PdfFont pdfFont = null;
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try {
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pdfFont = PdfFontFactory.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
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} catch (IOException e) {
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e.printStackTrace();
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}
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PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamAfter(), page.getResources(), document);
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Paragraph waterMark = new Paragraph(waterMarkContent).setOpacity(0.5f);
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Canvas canvas = new Canvas(pdfCanvas, pageSize)
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.setFontColor(WebColors.getRGBColor("lightgray"))
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.setFontSize(16)
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.setFont(pdfFont);
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for (int i = 0; i < waterMarkX; i++) {
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for (int j = 0; j < waterMarkY; j++) {
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canvas.showTextAligned(waterMark, (150 + i * 300), (160 + j * 150), document.getNumberOfPages(), TextAlignment.CENTER, VerticalAlignment.BOTTOM, 120);
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}
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}
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canvas.close();
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}
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}
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