SvgSortElementsCallback Delegate
Summary
Callback to receive the sorted SVG elements.
Syntax
C#
Objective-C
C++/CLI
Java
Python
BOOL (^)(LTSvgDocument *document, LTSvgElementInfo *info, id _Nullable userData)
Parameters
info
Element information.
userData
Optional user data. This is the same parameter passed to SortElements.
Return Value
true to continue to the next element (if any), and false to stop enumerating.
Example
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Drawing;
using Leadtools.Forms.DocumentWriters;
using Leadtools.Svg;
using Leadtools.Document.Writer;
public void SortElementsExample()
{
// The source PDF file
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.pdf");
string dstFileName = Path.Combine(LEAD_VARS.ImagesDir, "Example.txt");
// SVG sort callback handler
SvgSortElementsCallback sortCallback = (callabackDocument, info, userData) =>
{
StreamWriter writer = userData as StreamWriter;
// Is it text?
SvgTextData textData = info.TextData;
if (textData != null)
{
// Yes, print it to the console
writer.Write(textData.Text + " ");
// See if its end of line
var len = textData.Text.Length;
if ((textData.CharacterFlags[len - 1] & SvgTextCharacterFlags.EndOfLine) == SvgTextCharacterFlags.EndOfLine)
writer.WriteLine();
}
return true;
};
using (var codecs = new RasterCodecs())
{
// Set 300 as the default value for loading document files
codecs.Options.RasterizeDocument.Load.Resolution = 300;
// get the number of pages
int pageCount = codecs.GetTotalPages(srcFileName);
// Create a writer for the output text file
using (StreamWriter writer = File.CreateText(dstFileName))
{
for (int pageNumber = 1; pageNumber <= pageCount; pageNumber++)
{
// Load this page as SVG, we are interested in the text only so
// we will ask LEADTOOLS to skip other elements
CodecsLoadSvgOptions loadSvgOptions = new CodecsLoadSvgOptions();
loadSvgOptions.DropShapes = false;
loadSvgOptions.DropImages = true;
loadSvgOptions.DropShapes = true;
using (SvgDocument svgDocument = codecs.LoadSvg(srcFileName, pageNumber, loadSvgOptions) as SvgDocument)
{
// Sort requires a flat document, so check for that
if (!svgDocument.IsFlat)
svgDocument.Flat(null);
if (!svgDocument.Bounds.IsValid)
svgDocument.CalculateBounds(false);
SvgSortOptions sortOptions = new SvgSortOptions();
sortOptions.ExtractText = SvgExtractText.Word;
sortOptions.SortFlags = SvgSortFlags.Default;
Console.WriteLine("Text for page {0}", pageNumber);
svgDocument.SortElements(sortOptions, sortCallback, writer);
}
}
// Show the text file
System.Diagnostics.Process.Start(dstFileName);
}
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images";
}
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.PrintStream;
import java.nio.file.FileVisitOption;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Stream;
import org.junit.*;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
import static org.junit.Assert.*;
import leadtools.*;
import leadtools.codecs.*;
import leadtools.document.writer.*;
import leadtools.svg.*;
public void svgDocumentSortElementsExample() {
String LEAD_VARS_ImagesDir = "C:\\LEADTOOLS23\\Resources\\Images";
// The source PDF file
String srcFilePath = combine(LEAD_VARS_ImagesDir, "Leadtools_pdf.svg");
String dstFilePath = combine(LEAD_VARS_ImagesDir, "Example.txt");
// SVG sort callback handler
SvgSortElementsCallback sortCallback = (callbackDocument, info, userData) -> {
try {
FileOutputStream writer = (FileOutputStream) userData;
PrintStream printWriter = new PrintStream(writer);
// Is it text?
SvgTextData textData = info.getTextData();
if (textData.getText() != null) {
// Yes, print it to the console
printWriter.print(textData.getText() + " ");
// See if its end of line
int length = textData.getText().length();
if ((textData.getCharacterFlags()[length - 1]
& SvgTextCharacterFlags.END_OF_LINE.getValue()) == SvgTextCharacterFlags.END_OF_LINE.getValue())
printWriter.println();
}
writer.flush();
} catch (Exception e) {
assertFalse(true);
e.printStackTrace();
}
return true;
};
RasterCodecs codecs = new RasterCodecs();
// Set 300 as the default value for loading document files
codecs.getOptions().getRasterizeDocument().getLoad().setResolution(300);
// get the number of pages
int pageCount = codecs.getTotalPages(srcFilePath);
// Create a stream for the output text file
try (FileOutputStream fos = new FileOutputStream(dstFilePath)) {
for (int pageNumber = 1; pageNumber <= pageCount; pageNumber++) {
// Load this page as SVG, we are interested in the text only so
// we will ask LEADTOOLS to skip other elements
CodecsLoadSvgOptions loadSvgOptions = new CodecsLoadSvgOptions();
loadSvgOptions.setDropImages(true);
loadSvgOptions.setDropShapes(true);
SvgDocument svgDocument = (SvgDocument) codecs.loadSvg(srcFilePath, pageNumber, loadSvgOptions);
// Sort requires a flat document, so check for that
if (!svgDocument.isFlat())
svgDocument.flat(null);
if (!svgDocument.getBounds().isValid())
svgDocument.calculateBounds(false);
SvgSortOptions sortOptions = new SvgSortOptions();
sortOptions.setExtractText(SvgExtractText.WORD.getValue());
sortOptions.setSortFlags(SvgSortFlags.DEFAULT.getValue());
System.out.println("Text for page " + pageNumber);
svgDocument.sortElements(sortOptions, sortCallback, fos);
}
} catch (Exception exception) {
assertFalse(true);
exception.printStackTrace();
}
System.out.println(sortCallback);
}
