Examples of com.google.collide.shared.document.anchor.Anchor

Package com.google.collide.shared.document.anchor

Examples of com.google.collide.shared.document.anchor.Anchor

com.google.collide.shared.document.anchor.Anchor
Model for an anchor in the document that maintains its up-to-date positioning in the document as text changes occur. An anchor should pass {@link AnchorManager#IGNORE_LINE_NUMBER} if its linenumber will not be used. Similarly, an anchor should pass {@link AnchorManager#IGNORE_COLUMN} if itscolumn will not be used. Anchors with this flag will be called "line anchors". One caveat with line anchors that have the {@link RemovalStrategy#REMOVE}removal strategy is they will be removed when the line's preceding newline character is removed. For example, if the cursor is at (line 2, column 0) and the user presses backspace, line 2's contents will be appended to line 1. In this case, any line anchors on line 2 will be removed. One example where this might be confusing is if the user selects from (line 1, column 0) to (line 2, column 0) and presses delete. This would delete the line anchors on line 2 with the {@link RemovalStrategy#REMOVE} strategy even though the user haslogically deleted the text on line 1. There used to be a partial exception to this rule to account for this confusin case, but that led to subtle bugs. Anchors can be positioned through the {@link AnchorManager}.

   */
  public void testBackwardsTraversal() {
    AnchorList anchorList = anchorManager.getAnchors(doc.getLastLine());
    assertEquals(2, anchorList.size());


    Anchor anchor = docEnd;
    for (int i = anchors.size() - 1; i >= 0; i--) {
      assertSame(anchors.get(i), anchor);
      assertEquals(anchors.get(i).getType(), anchor.getType());
      anchor = anchorManager.getPreviousAnchor(anchor);
    }
  }

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  /**
   * Currently, we rely on being able to push anchors past the end of the line.
   */
  public void testAnchorPastEnd() {
    Line line = doc.getFirstLine().getNextLine();
    Anchor anchor = anchorManager.createAnchor(ANCHOR_TYPE_1, line, IGNORE_LINE_NUMBER, 1);
    assertSame(anchorManager.getPreviousAnchor(anchor), firstEmptyLine);


    line = line.getNextLine();
    anchorManager.moveAnchor(anchor, line, IGNORE_LINE_NUMBER, 100);
    assertSame(anchorManager.getPreviousAnchor(anchor), theBeginning);

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      if (a.getType().equals(ANCHOR_TYPE_1)) {
        type1Anchors.add(a);
      }
    }


    Anchor anchor = docStart;
    assertEquals(ANCHOR_TYPE_1, anchor.getType());
    for (Anchor a : type1Anchors) {
      assertSame(a, anchor);
      assertEquals(ANCHOR_TYPE_1, anchor.getType());
      anchor = anchorManager.getNextAnchor(anchor, ANCHOR_TYPE_1);
    }
    assertNull(anchor);
  }

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    }
    assertNull(anchor);
  }


  public void testInsertionPlacementStrategyForLineAnchors() {
    Anchor a1 =
        createAnchorForPlacementStrategy(doc.getFirstLine(), true, IGNORE_COLUMN, EARLIER);
    Anchor a2 =
        createAnchorForPlacementStrategy(doc.getFirstLine(), true, IGNORE_COLUMN, LATER);
    assertAnchorLineNumbers(a1, 0, a2, 0);


    doc.insertText(doc.getFirstLine(), 0, "Newline\n");
    assertAnchorLineNumbers(a1, 0, a2, 1);

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    doc.insertText(doc.getFirstLine(), 0, "Many\nnew\nlines\n!\n");
    assertAnchorLineNumbers(a1, 0, a2, 4);
  }


  public void testInsertionPlacementStrategyForColumnAnchors() {
    Anchor a1 = createAnchorForPlacementStrategy(doc.getFirstLine(), false, 0, EARLIER);
    Anchor a2 = createAnchorForPlacementStrategy(doc.getFirstLine(), false, 0, LATER);
    assertAnchorColumns(a1, 0, a2, 0);


    doc.insertText(doc.getFirstLine(), 0, "a");
    assertAnchorColumns(a1, 0, a2, 1);


    doc.deleteText(doc.getFirstLine(), 0, doc.getFirstLine().getText().length());
    assertAnchorColumns(a1, 0, a2, 0);


    doc.insertText(doc.getFirstLine(), 0, "more than a trivial insertion");
    assertAnchorColumns(a1, 0, a2, "more than a trivial insertion".length());


    doc.insertText(doc.getFirstLine(), 0, "\n");
    assertEquals(doc.getFirstLine(), a1.getLine());
    assertEquals(doc.getFirstLine().getNextLine(), a2.getLine());
    assertAnchorColumns(a1, 0, a2, "more than a trivial insertion".length());
  }

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    assertEquals(doc.getFirstLine().getNextLine(), a2.getLine());
    assertAnchorColumns(a1, 0, a2, "more than a trivial insertion".length());
  }


  public void testInsertionPlacementStrategyForLineNumberAndColumnAnchors() {
    Anchor a1 = createAnchorForPlacementStrategy(doc.getFirstLine(), true, 1, EARLIER);
    Anchor a2 = createAnchorForPlacementStrategy(doc.getFirstLine(), true, 1, LATER);
    assertAnchorPositions(a1, 0, 1, a2, 0, 1);


    doc.insertText(doc.getFirstLine(), 0, "a");
    assertAnchorPositions(a1, 0, 2, a2, 0, 2);

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    assertAnchorPositions(a1, 1, 0, a2, 5, "more than a trivial insertion".length());
  }


  private Anchor createAnchorForPlacementStrategy(Line line, boolean storeLineNumber, int column,
      InsertionPlacementStrategy insertionPlacementStrategy) {
    Anchor a =
        doc.getAnchorManager().createAnchor(ANCHOR_TYPE_1, doc.getFirstLine(),
            storeLineNumber ? doc.getLineFinder().findLine(line).number() : IGNORE_LINE_NUMBER,
            column);
    a.setInsertionPlacementStrategy(insertionPlacementStrategy);
    a.setRemovalStrategy(RemovalStrategy.SHIFT);
    return a;
  }

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        columnAnchorOnLine0Newline.getColumn(), 1, "Hello worldFoo bar\n");
  }


  public void testViewportBottomShiftingOnSmallDocument() {
    Document doc = Document.createFromString("abc\n");
    Anchor bottomAnchor =
        doc.getAnchorManager().createAnchor(DOCUMENT_TEST_ANCHOR_TYPE, doc.getLastLine(), 1,
        IGNORE_COLUMN);
    deleteAndAssertEquals(doc.getFirstLine(), 3, 1, "abc");
    assertAnchorPosition(bottomAnchor, 0, false, IGNORE_COLUMN);
  }

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  }


  public void testCursorAtEndOfOnlyLine() {
    Document doc = Document.createFromString("abc");
    // Column is the non-existent character after 'c'
    Anchor cursorAnchor =
        doc.getAnchorManager().createAnchor(DOCUMENT_TEST_ANCHOR_TYPE, doc.getFirstLine(), 0, 3);
    cursorAnchor.setRemovalStrategy(Anchor.RemovalStrategy.SHIFT);
    deleteAndAssertEquals(doc.getFirstLine(), 0, 3, "");
    assertAnchorPosition(cursorAnchor, 0, false, 0);
  }

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   * "number of lines / 2".
   */
  private static List<Class<?>> setupForListenerCallbackOrdering(Document doc) {
    final List<Class<?>> callbackOrdering = Lists.newArrayList();
    
    Anchor shiftAnchor =
        doc.getAnchorManager().createAnchor(DOCUMENT_TEST_ANCHOR_TYPE,
            doc.getLineFinder().findLine(doc.getLineCount() / 2).line(), doc.getLineCount() / 2, 0);
    shiftAnchor.setRemovalStrategy(RemovalStrategy.SHIFT);
    shiftAnchor.getShiftListenerRegistrar().add(new ShiftListener() {
      @Override
      public void onAnchorShifted(Anchor anchor) {
        callbackOrdering.add(ShiftListener.class);
      }
    });


    Anchor removeAnchor =
      doc.getAnchorManager().createAnchor(DOCUMENT_TEST_ANCHOR_TYPE,
          doc.getLineFinder().findLine(doc.getLineCount() / 2).line(), doc.getLineCount() / 2, 0);
    removeAnchor.getRemoveListenerRegistrar().add(new RemoveListener() {
      @Override
      public void onAnchorRemoved(Anchor anchor) {
        callbackOrdering.add(RemoveListener.class);
      }
    });

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