PDFTron WebViewer

Namespace: Annotations

Core. Annotations

The namespace for anything to do with PDF annotations.

Classes

Annotation
ArcAnnotation
Border
BoxControlHandle
BoxSelectionModel
ButtonWidgetAnnotation
CalloutControlHandle
CalloutSelectionModel
CanvasHelper
CaretAnnotation
CheckButtonWidgetAnnotation
ChoiceWidgetAnnotation
Color
ControlHandle
CustomAnnotation
DatePickerWidgetAnnotation
EllipseAnnotation
FileAttachmentAnnotation
FileAttachmentUtils
Font
Forms
FreeHandAnnotation
FreeTextAnnotation
FreeTextSelectionModel
HTMLAnnotation
IPathAnnotation
LineAnnotation
LineControlHandle
LineSelectionModel
Link
ListWidgetAnnotation
MarkupAnnotation
Model3D
PathControlHandle
PathSelectionModel
PolygonAnnotation
PolygonControlHandle
PolygonSelectionModel
PolylineAnnotation
PopupAnnotation
RadioButtonWidgetAnnotation
RectangleAnnotation
RedactionAnnotation
RedactionSelectionModel
RotationControlHandle
RotationUtils
SelectionAlgorithm
SelectionModel
SignatureWidgetAnnotation
SoundAnnotation
StampAnnotation
StickyAnnotation
TextHighlightAnnotation
TextMarkupAnnotation
TextRedactAnnotation
TextSelectionModel
TextSquigglyAnnotation
TextStrikeoutAnnotation
TextUnderlineAnnotation
TextWidgetAnnotation
WidgetAnnotation
WidgetFlags
XFDFUtils

Members

<static> LineEndType

An enum representing different line end types that are available for line annotations
Type:
  • string
Properties:
Name Type Description
NONE string No line endings
OPEN_ARROW string an arrow that points outward
R_OPEN_ARROW string an arrow that points inward
CLOSED_ARROW string a triangle that points outward
R_CLOSED_ARROW string a triangle that points inward
BUTT string a vertical line
SQUARE string a square
DIAMOND string a diamond
CIRCLE string a circle
SLASH string a slash

<static> LineStyleType

An enum representing different line types that are available for line annotations
Type:
  • string
Properties:
Name Type Description
SOLID string solid line style
DASH_1_2_2 string dashed line with [1,2,2] style
DASH_3_3 string dashed line with [3,3] style
DASH_3_3_4 string dashed line with [3,3,4] style
DASH_1_3_5 string dashed line with [1,3,5] style
DASH_2_2_4 string dashed line with [2,2,4] style
DASH_4_3_16_3 string dashed line with [4,3,16,3] style
CLOUDY string cloudy line style

Methods

<static> restoreDeserialize(annotationClass)

Restores the deserialize function back to the default.
Parameters:
Name Type Description
annotationClass Core.Annotations.Annotation The class (constructor) of the annotation

<static> restoreDraw(annotationClass)

Restores the draw function back to the default.
Parameters:
Name Type Description
annotationClass Core.Annotations.Annotation The class (constructor) of the annotation

<static> restoreSerialize(annotationClass)

Restores the serialize function back to the default.
Parameters:
Name Type Description
annotationClass Core.Annotations.Annotation The class (constructor) of the annotation

<static> setCustomControlHandleDrawHandler(controlHandle, controlHandleDrawHandler)

Change ControlHandle's draw to customize appearance on the provided canvas context.
Parameters:
Name Type Description
controlHandle Core.Annotations.ControlHandle The class (constructor) of the controlHandle
controlHandleDrawHandler CustomControlHandleDrawHandler The handler will customize the appearance of the controlHandle
Example
Annotations.setCustomControlHandleDrawHandler(Core.Annotations.ControlHandle, function(ctx, annotation, selectionBox, zoom, {controlHandle, originalDraw}) {
  if(controlHandle instanceof Core.Annotations.BoxControlHandle) {
    const dim = this.getDimensions(annotation, selectionBox, zoom);
    ctx.fillStyle = '#FFFFFF';
    ctx.beginPath();
    ctx.moveTo(dim.x1 + (dim.getWidth() / 2), dim.y1);
    ctx.lineTo(dim.x1 + dim.getWidth(), dim.y1 + dim.getHeight());
    ctx.lineTo(dim.x1, dim.y1 + dim.getHeight());
    ctx.closePath();
    ctx.stroke();
    ctx.fill();
  } else {
     originalDraw(ctx, annotation, selectionBox, zoom);
  }
})

<static> setCustomCreateInnerElementHandler(annotationClass, createInnerElementHandler)

Change createInnerElement to customize the HTML element.
Parameters:
Name Type Description
annotationClass Core.Annotations.WidgetAnnotation The annotation being selected to change innerElement
createInnerElementHandler Core.Annotations.CustomCreateInnerElementHandler
Example
Annotations.setCustomCreateInnerElementHandler(Annotations.CheckButtonWidgetAnnotation, function(annotationManager, {annotation, originalCreateInnerElement}){
 const button = this;
  const el = originalCreateInnerElement();
  el.addEventListener('click', () => {
    console.log('check button clicked', annotation.fieldName);
  });
  return el;
})

<static> setCustomCreateSignHereElementHandler(createSignHereElementHandler)

Change createSignHereElement to customize the HTML element.
Parameters:
Name Type Description
createSignHereElementHandler Core.Annotations.CustomCreateSignHereElementHandler
Example
Annotations.setCustomCreateSignHereElementHandler(function(tool, {annotation, originalCreateSignHereElement}) {
  const signHereElement = originalCreateSignHereElement(tool);
  signHereElement.style.background = "red";
  return signHereElement;
})

<static> setCustomDeserializeHandler(annotationClass, deserializeHandler)

Changes how an annotation type is deserialized within WebViewer. If your custom property/attribute is stored in the CustomData, please consider using getCustomData instead.
Parameters:
Name Type Description
annotationClass Core.Annotations.Annotation The class (constructor) of the annotation
deserializeHandler Core.Annotations.CustomAnnotationDeserializeHandler A handler function that will deserialize the annotation
Example
Annotations.setCustomDeserializeHandler(Annotations.RectangleAnnotation, function(element, pageMatrix, options) {
  const annot = options.annotation;
  options.originalDeserialize(element, pageMatrix)
  if (annot.Width > 100) {
    annot.myProperty = element.getAttribute('myAttr');
  }
});

<static> setCustomDrawHandler(annotationClass, drawHandler [, options])

Changes how an annotation type is drawn within WebViewer. By default, this will also generate an appearance for the annotation when the document is downloaded, so it will appear the same in other viewers. Please note that changes to the annotation may cause the appearance to be discarded, reverting it back to normal.
Please note that NoZoom annotations do render slightly differently from standard annotations. Nonetheless, please draw at the annotation coordinates. The appearance set by addCustomAppearance will take priority.
Parameters:
Name Type Argument Description
annotationClass Core.Annotations.Annotation The class (constructor) of the annotation
drawHandler Core.Annotations.CustomAnnotationDrawHandler A handler function that will draw the annotation
options Core.Annotations.CustomDrawOptions <optional>
 Optional options
Properties
Name Type Argument Description
generateAppearance boolean <optional>
 Whether to generate a custom appearance. Defaults to true
canvasMultiplier number <optional>
 The quality value of the generated custom appearance. The higher the value, the more memory is required. By default, this will use the canvas multiplier value set in WebViewer
Example
Annotations.setCustomDrawHandler(Annotations.RectangleAnnotation, function(ctx, pageMatrix, rotation, options) {
  options.originalDraw(ctx, pageMatrix); // Draw original annotation
  const annot = options.annotation;

  // Draw annotation ID overtop the rectangle
  ctx.fillStyle = '#FF0000';
  ctx.strokeStyle = '#000000';
  const fontSize = 12;
  ctx.fillText(annot.Id, annot.X, annot.Y + fontSize);   // Draw at annotation location
  ctx.strokeText(annot.Id, annot.X, annot.Y + fontSize);
});

<static> setCustomSerializeHandler(annotationClass, serializeHandler)

Changes how an annotation type is serialized within WebViewer. Note that custom attributes will not be persisted in the downloaded PDF and are only useful if you're saving the XFDF separately from the PDF. If you are looking to save your custom property/attribute, please consider using setCustomData which will be persisted.
Parameters:
Name Type Description
annotationClass Core.Annotations.Annotation The class (constructor) of the annotation
serializeHandler Core.Annotations.CustomAnnotationSerializeHandler A handler function that will serialize the annotation
Example
Annotations.setCustomSerializeHandler(Annotations.RectangleAnnotation, function(element, pageMatrix, options) {
  const annot = options.annotation;
  options.originalSerialize(element, pageMatrix)
  if (annot.Width > 100) {
    element.setAttribute('myAttr', 1);
  }
  return element;
});

Type Definitions

AnnotationDrawFunction(ctx, pageMatrix [, rotation])

Annotation draw function signature.
Parameters:
Name Type Argument Description
ctx CanvasRenderingContext2D A canvas context
pageMatrix object The transformation matrix for the page that the annotation is on
rotation number <optional>
 Certain annotations, such as sticky notes, get rotation as a third parameter. Default: undefined

CustomAnnotationDeserializeHandler(element, pageMatrix, options)

Callback that gets passed to deserializeHandler in setCustomDeserializeHandler. The signature is similar to deserialize except with an additional options parameter.
Parameters:
Name Type Description
element Element An xml element representing the annotation
pageMatrix object The page matrix used to convert PDF coordinates to viewer coordinates
options object Additional options and parameters
Properties
Name Type Description
annotation Core.Annotations.Annotation The annotation being deserialized
originalDeserialize function The original deserialize function of this annotation

CustomAnnotationDrawHandler(ctx, pageMatrix, rotation, options)

Callback that gets passed to drawHandler in setCustomDrawHandler. The signature is similar to draw except with an additional options parameter.
Parameters:
Name Type Description
ctx CanvasRenderingContext2D A canvas context
pageMatrix object The transformation matrix for the page that the annotation is on
rotation number Certain annotations, such as sticky notes, get rotation as a third parameter. Default: undefined
options Core.Annotations.AdditionalOptions Additional options and parameters
Properties
Name Type Description
annotation Core.Annotations.Annotation The annotation being drawn
originalDraw Core.Annotations.AnnotationDrawFunction The original draw function of this annotation

CustomAnnotationSerializeHandler(element, pageMatrix, options)

Callback that gets passed to serializeHandler in setCustomSerializeHandler. The signature is similar to serialize except with an additional options parameter.
Parameters:
Name Type Description
element Element An xml element representing the annotation
pageMatrix object The page matrix used to convert PDF coordinates to viewer coordinates
options object Additional options and parameters
Properties
Name Type Description
annotation Core.Annotations.Annotation The annotation being serialized
originalSerialize function The original serialize function of this annotation
Returns:
The resulting xml element representing the annotation
Type
Element

CustomControlHandleDrawHandler(ctx, annotation, selectionBox, zoom, options)

Callback that gets passed to controlHandleDrawHandler in setCustomControlHandleDrawHandler. The signature is similar to draw except with an additional options parameter.
Parameters:
Name Type Description
ctx CanvasRenderingContext2D The annotation canvas context
annotation Core.Annotations.Annotation The annotation to modify
selectionBox Core.Math.Rect The selection rect
zoom number The current zoom level of the document
options object Additional options and parameters
Properties
Name Type Description
controlHandle Core.Annotations.ControlHandle The selected controlHandle instance
originalDraw function The original draw function of the controlHandle

CustomCreateInnerElementHandler(annotationManager, options)

Callback that gets passed to createInnerElementHandler in setCustomCreateInnerElementHandler. The signature is similar to createInnerElement except with an additional options parameter.
Parameters:
Name Type Description
annotationManager Core.AnnotationManager
options object Additional options and parameters
Properties
Name Type Description
annotation Core.Annotations.WidgetAnnotation The annotation being selected to change innerElement
originalCreateInnerElement function The original createInnerElement function of this annotation
Returns:
An HTML element
Type
HTMLElement

CustomCreateSignHereElementHandler(signatureTool, options)

Callback that gets passed to createSignHereElementHandler in setCustomCreateSignHereElementHandler. The signature is similar to createSignHereElement except with an additional options parameter.
Parameters:
Name Type Description
signatureTool Core.Tools.SignatureCreateTool The tool that create signature annotation widget
options object Additional options and parameters
Properties
Name Type Description
annotation Core.Annotations.SignatureWidgetAnnotation The annotation being selected to create sign here element
originalCreateSignHereElement function The original createSignHereElement function of this annotation
Returns:
An HTML element
Type
HTMLElement

measurementCaptionOptions

Type:
  • Object
Properties:
Name Type Argument Description
isEnabled boolean The flag for enabling or disabling measurement captions on the annotation.
captionRect Core.Math.Rect <optional>
 The caption's text bounding rect. The bounding rect will be auto-adjusted to the annotation's visual center if the annotation is resized.
captionStyle.color string <optional>
 The caption's text color. Default to measurement annotation's color when not set. Accepts CSS HEX or CSS RGBA values.
captionStyle.staticSize string <optional>
 The static size for caption text. This option is ignored when it's set to 0pt.
captionStyle.maximumSize string <optional>
 The maximum caption text size. This option is ignored when it's set to 0pt or when staticSize is set to positive values.