Add print-to-pdf example

Author: kklisura

cdt-examples/src/main/java/com/github/kklisura/cdt/examples/PrintingPageToPdf.java

@@ -0,0 +1,106 @@
+package com.github.kklisura.cdt.examples;
+
+import com.github.kklisura.cdt.launch.ChromeLauncher;
+import com.github.kklisura.cdt.protocol.commands.Page;
+import com.github.kklisura.cdt.services.ChromeDevToolsService;
+import com.github.kklisura.cdt.services.ChromeService;
+import com.github.kklisura.cdt.services.types.ChromeTab;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.Base64;
+
+/**
+ * The following example opens the http://github.com and prints its page to PDF. PDF printing is supported on chrome
+ * headless at the moment.
+ *
+ * @author Kenan Klisura
+ */
+public class PrintingPageToPdf {
+  public static void main(String[] args) {
+    // Create chrome launcher.
+    final ChromeLauncher launcher = new ChromeLauncher();
+
+    // Launch chrome either as headless (true) - PDF printing is only supported on Chrome headless at the moment
+    final ChromeService chromeService = launcher.launch(true);
+
+    // Create empty tab ie about:blank.
+    final ChromeTab tab = chromeService.createTab();
+
+    // Get DevTools service to this tab
+    final ChromeDevToolsService devToolsService = chromeService.createDevToolsService(tab);
+
+    // Get individual commands
+    final Page page = devToolsService.getPage();
+    page.enable();
+
+    // Navigate to github.com.
+    page.navigate("http://github.com");
+
+    page.onLoadEventFired(loadEventFired -> {
+      System.out.println("Printing to PDF...");
+
+      final String outputFilename = "test.pdf";
+
+      Boolean landscape = false;
+      Boolean displayHeaderFooter = false;
+      Boolean printBackground = false;
+      Double scale = 1d;
+      Double paperWidth = 8.27d; // A4 paper format
+      Double paperHeight = 11.7d; // A4 paper format
+      Double marginTop = 0d;
+      Double marginBottom  = 0d;
+      Double marginLeft = 0d;
+      Double marginRight = 0d;
+      String pageRanges = "";
+      Boolean ignoreInvalidPageRanges = false;
+      String headerTemplate = "";
+      String footerTemplate = "";
+      Boolean preferCSSPageSize = false;
+
+      dump(outputFilename,
+          devToolsService.getPage().printToPDF(
+              landscape,
+              displayHeaderFooter,
+              printBackground,
+              scale,
+              paperWidth,
+              paperHeight,
+              marginTop,
+              marginBottom,
+              marginLeft,
+              marginRight,
+              pageRanges,
+              ignoreInvalidPageRanges,
+              headerTemplate,
+              footerTemplate,
+              preferCSSPageSize)
+      );
+
+      System.out.println("Done!");
+      devToolsService.close();
+    });
+
+    devToolsService.waitUntilClosed();
+  }
+
+  private static void dump(String fileName, String data) {
+    FileOutputStream fileOutputStream = null;
+    try {
+      File file = new File(fileName);
+      fileOutputStream = new FileOutputStream(file);
+      fileOutputStream.write(Base64.getDecoder().decode(data));
+    } catch (IOException e) {
+      e.printStackTrace();
+    } finally {
+      if (fileOutputStream != null) {
+        try {
+          fileOutputStream.flush();
+          fileOutputStream.close();
+        } catch (IOException e) {
+          e.printStackTrace();
+        }
+      }
+    }
+  }
+}