Add tests for absolutely positioned elements added to Canvas

DEVSIX-4835

(cherry picked from commit 54b0b000fdffec55012fed10dc775ca1e362601f)

Author: Kate Ivanova

io/src/main/java/com/itextpdf/io/LogMessageConstant.java

@@ -65,6 +65,7 @@ public final class LogMessageConstant {
     public static final String CANNOT_REPLACE_FINISHED_HINT = "Layout tagging hints modification failed: cannot replace a kid hint that is already marked as finished.";
     public static final String CANNOT_RESOLVE_ROLE_IN_NAMESPACE_TOO_MUCH_TRANSITIVE_MAPPINGS = "Cannot resolve \"{0}\" role in {1} namespace mapping to standard role, because of the too much transitive mappings.";
     public static final String CANNOT_RESOLVE_ROLE_TOO_MUCH_TRANSITIVE_MAPPINGS = "Cannot resolve \"{0}\" role mapping to standard role, because of the too much transitive mappings.";
+    public static final String CANVAS_ALREADY_FULL_ELEMENT_WILL_BE_SKIPPED = "Canvas is already full. Element will be skipped.";
     public static final String CHARACTER_DIRECTION_HAS_NOT_BEEN_DETECTED = "The direction for this character has not been detected: code point {0}. The Other Neutrals algorithm will be used.";
     public static final String CLIP_ELEMENT = "Element content was clipped because some height properties are set.";
     public static final String COLLECTION_DICTIONARY_ALREADY_EXISTS_IT_WILL_BE_MODIFIED = "Collection dictionary already exists. It will be modified.";

layout/src/main/java/com/itextpdf/layout/renderer/CanvasRenderer.java

@@ -43,6 +43,7 @@ This file is part of the iText (R) project.
  */
 package com.itextpdf.layout.renderer;
 
+import com.itextpdf.io.LogMessageConstant;
 import com.itextpdf.kernel.pdf.tagutils.TagTreePointer;
 import com.itextpdf.layout.Canvas;
 import com.itextpdf.layout.layout.LayoutArea;
@@ -83,7 +84,8 @@ public CanvasRenderer(Canvas canvas, boolean immediateFlush) {
     @Override
     public void addChild(IRenderer renderer) {
         if (Boolean.TRUE.equals(getPropertyAsBoolean(Property.FULL))) {
-            LoggerFactory.getLogger(CanvasRenderer.class).warn("Canvas is already full. Element will be skipped.");
+            LoggerFactory.getLogger(CanvasRenderer.class).warn(
+                    LogMessageConstant.CANVAS_ALREADY_FULL_ELEMENT_WILL_BE_SKIPPED);
         } else {
             super.addChild(renderer);
         }

layout/src/test/java/com/itextpdf/layout/CanvasTest.java

@@ -51,6 +51,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.kernel.pdf.action.PdfAction;
 import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
 import com.itextpdf.kernel.utils.CompareTool;
+import com.itextpdf.layout.element.Div;
 import com.itextpdf.layout.element.Link;
 import com.itextpdf.layout.element.Paragraph;
 import com.itextpdf.test.ExtendedITextTest;
@@ -61,8 +62,10 @@ This file is part of the iText (R) project.
 import java.io.IOException;
 import org.junit.Assert;
 import org.junit.BeforeClass;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
+import org.junit.rules.ExpectedException;
 
 @Category(IntegrationTest.class)
 public class CanvasTest extends ExtendedITextTest {
@@ -75,6 +78,9 @@ public static void beforeClass() {
         createOrClearDestinationFolder(destinationFolder);
     }
 
+    @Rule
+    public ExpectedException junitExpectedException = ExpectedException.none();
+
     @Test
     @LogMessages(messages = @LogMessage(messageTemplate = LogMessageConstant.UNABLE_TO_APPLY_PAGE_DEPENDENT_PROP_UNKNOWN_PAGE_ON_WHICH_ELEMENT_IS_DRAWN))
     public void canvasNoPageLinkTest() throws IOException, InterruptedException {
@@ -192,4 +198,85 @@ public void canvasWithPageEnableTaggingTest02() throws IOException, InterruptedE
 
         Assert.assertNull(new CompareTool().compareByContent(out, cmp, destinationFolder));
     }
+
+    @Test
+    public void elementWithAbsolutePositioningInCanvasTest() throws IOException, InterruptedException {
+        String testName = "elementWithAbsolutePositioningInCanvas";
+        String out = destinationFolder + testName + ".pdf";
+        String cmp = sourceFolder + "cmp_" + testName + ".pdf";
+
+        try (PdfDocument pdf = new PdfDocument(new PdfWriter(out))) {
+            pdf.addNewPage();
+            Canvas canvas = new Canvas(new PdfCanvas(pdf.getFirstPage()),
+                    new Rectangle(120, 650, 60, 80));
+
+            Div notFittingDiv = new Div().setWidth(100)
+                    .add(new Paragraph("Paragraph in Div with Not set position"));
+            canvas.add(notFittingDiv);
+
+            Div divWithPosition = new Div().setFixedPosition(120, 300, 80);
+            divWithPosition.add(new Paragraph("Paragraph in Div with set position"));
+            canvas.add(divWithPosition);
+
+            canvas.close();
+        }
+
+        Assert.assertNull(new CompareTool().compareByContent(out, cmp, destinationFolder));
+    }
+
+    @Test
+    //TODO: DEVSIX-4820 (discuss the displaying of element with absolute position)
+    @LogMessages(messages = {@LogMessage(messageTemplate = LogMessageConstant.CANVAS_ALREADY_FULL_ELEMENT_WILL_BE_SKIPPED)})
+    public void parentElemWithAbsolPositionKidNotSuitCanvasTest() throws IOException, InterruptedException {
+        String testName = "parentElemWithAbsolPositionKidNotSuitCanvas";
+        String out = destinationFolder + testName + ".pdf";
+        String cmp = sourceFolder + "cmp_" + testName + ".pdf";
+
+        try (PdfDocument pdf = new PdfDocument(new PdfWriter(out))) {
+            pdf.addNewPage();
+
+            Canvas canvas = new Canvas(new PdfCanvas(pdf.getFirstPage()),
+                    new Rectangle(120, 650, 55, 80));
+
+            Div notFittingDiv = new Div().setWidth(100).add(new Paragraph("Paragraph in Div with Not set position"));
+            canvas.add(notFittingDiv);
+
+            Div divWithPosition = new Div().setFixedPosition(120, 300, 80);
+            divWithPosition.add(new Paragraph("Paragraph in Div with set position"));
+            canvas.add(divWithPosition);
+
+            canvas.close();
+        }
+
+        Assert.assertNull(new CompareTool().compareByContent(out, cmp, destinationFolder));
+    }
+
+    @Test
+    //TODO: DEVSIX-4820 (NullPointerException on processing absolutely positioned elements in small canvas area)
+    public void nestedElementWithAbsolutePositioningInCanvasTest() throws IOException, InterruptedException {
+        junitExpectedException.expect(NullPointerException.class);
+
+        String testName = "nestedElementWithAbsolutePositioningInCanvas";
+        String out = destinationFolder + testName + ".pdf";
+        String cmp = sourceFolder + "cmp_" + testName + ".pdf";
+
+        try (PdfDocument pdf = new PdfDocument(new PdfWriter(out))) {
+            pdf.addNewPage();
+
+            Canvas canvas = new Canvas(new PdfCanvas(pdf.getFirstPage()),
+                    new Rectangle(120, 650, 55, 80));
+
+            Div notFittingDiv = new Div().setWidth(100).add(new Paragraph("Paragraph in Div with Not set position"));
+
+            Div divWithPosition = new Div().setFixedPosition(50, 20, 80);
+            divWithPosition.add(new Paragraph("Paragraph in Div with set position"));
+
+            notFittingDiv.add(divWithPosition);
+            canvas.add(notFittingDiv);
+            
+            canvas.close();
+        }
+
+        Assert.assertNull(new CompareTool().compareByContent(out, cmp, destinationFolder));
+    }
 }