PDFTron WebViewer

Class: EraserTool

Tools. EraserTool

Represents the tool for creating Annotations.EraserTool.

new EraserTool(docViewer)

Represents the tool for erasing annotations.
Parameters:
Name Type Description
docViewer CoreControls.DocumentViewer an instance of DocumentViewer.

Extends

Methods

contextMenu(e)

The function called when a context menu should be shown. Use e.preventDefault to disable the default browser context menu
Parameters:
Name Type Description
e the event object
Inherited From:

getDocumentViewer()

Returns the instance of DocumentViewer for this tool.
Inherited From:
Returns:
the instance of DocumentViewer for this tool.
Type
CoreControls.DocumentViewer

getMouseLocation(e)

Takes an event object from a mouse event and converts the location into window coordinates
Parameters:
Name Type Description
e the event object containing mouse coordinates
Inherited From:
Returns:
returns an object with x and y coordinates of the mouse cursor in the viewer
Type
Annotations.Point

keyDown(e)

The function called when a keyboard key is down.
Parameters:
Name Type Description
e the event object containing keyboard key data.
Inherited From:

mouseDoubleClick(e)

The function called when the mouse left button is double clicked.
Parameters:
Name Type Description
e the event object containing mouse coordinates.
Inherited From:

mouseLeftDown(e)

The function called when the left mouse button is down
Parameters:
Name Type Description
e the event object containing mouse coordinates.
Inherited From:

mouseLeftUp(e)

The function called when the left mouse button is up. Typically, annotations are created and added to the annotation manager at this point.
Parameters:
Name Type Description
e the event object containing mouse coordinates.
Inherited From:

mouseMove(e)

The function called when the mouse moves.
Parameters:
Name Type Description
e the event object containing mouse coordinates.
Inherited From:

off( [type] [, fn])

Remove a handler of the given event name
Parameters:
Name Type Argument Description
type string | number <optional>
 The name of the event to remove the handler of. If type is undefined, all the handlers of the object will be removed
fn function <optional>
 The handler associated with this event to be removed. If fn is undefined, all the handlers of the given event name will be removed
Inherited From:
Returns:
Returns the object that 'off' is being called on
Type
object
Example
annotManager.off();
annotManager.off('annotationChanged');
annotManager.off('annotationChanged', fn);

on(type, fn)

Add a handler to the given event name
Parameters:
Name Type Description
type string | number The name of the event to listen to
fn function The handler to be called when the event is triggered
Inherited From:
Returns:
Returns the object that 'on' is being called on
Type
object
Example
annotManager.on('annotationChanged', (annotations, action) => {
  ...
});

one(type, fn)

Same as 'on' except the handler will be called only once
Parameters:
Name Type Description
type string | number The name of the event to listen to
fn function The handler to be called when the event is triggered
Inherited From:
Returns:
Returns the object that 'one' is being called on
Type
object
Example
annotManager.one('annotationChanged', (annotations, action) => {
 ...
});

setEnableImmediateActionOnAnnotationSelection(enable)

Set if the tool should trigger action immediately after clicking an annotation. For example, if this is enabled then you can immediately click and drag an annotation without making a separate click to select the annotation.
Parameters:
Name Type Description
enable boolean a boolean indicating whether actions are triggered immediately on clicking on an annotation
Inherited From:
Example
To enable this for one tool (The Pan tool, for example), this can be done:

const tool = docViewer.getTool(window.Tools.ToolNames.PAN);
tool.setEnableImmediateActionOnAnnotationSelection(true);

To enable this for all selection tools, this can be done:

const allTools = Object.values(docViewer.getToolModeMap());
for (const tool of allTools) {
  if (tool instanceof Tools.AnnotationSelectTool) {
    tool.setEnableImmediateActionOnAnnotationSelection(true);
  }
}

setName(name)

Set the name of the tool, which can be accessed by toolObject.name
Parameters:
Name Type Description
name string name of the tool
Inherited From:

setStyles(newStyles)

Set the style for the tool, which will be applied to annotations drawn afterwards
Parameters:
Name Type Description
newStyles object | function if an object is used, it should contain properties of the new styles. If a function is used, the current styles will be passed as its argument and the function should return an object which contains properties of the new styles. Example of valid properties: StrokeColor, TextColor, FillColor, FontSize, Opacity, StrokeThickness, Precision, Scale, OverlayText, Style and Dashes.
Inherited From:

switchIn(oldTool)

The function called when this tool is selected. Typically use for changing mouse cursors, and initializing states for the tool.
Parameters:
Name Type Description
oldTool Tools.Tool the Tool class that was previously selected.
Inherited From:

switchOut(newTool)

The function called when this tool is deselected. Typically use for changing mouse cursors, and cleaning up states for the tool.
Parameters:
Name Type Description
newTool Tools.Tool the Tool class that was newly selected.
Inherited From:

trigger(type [, data])

Calls the handlers of the event name with given data
Parameters:
Name Type Argument Description
type string | number event name of which the handlers will be called.
data * <optional>
 data that will be passed to the handlers. If data is an array, it will be spread and then passed to the handlers
Inherited From:
Returns:
Returns the object that 'trigger' is being called on
Type
object
Example
annotManager.trigger('annotationChanged');
annotManager.trigger('annotationChanged', [[annotation], 'add', {}]);

Events

annotationAdded

Triggered when an annotation has been added to the document by the tool
Parameters:
Name Type Description
annotation Annotations.Annotation The annotation that was added
Inherited From:

annotationCreated

Triggered when an annotation has been created by the tool
Parameters:
Name Type Description
annotations Annotations.Annotation The annotation that was created
Inherited From:

erasingAnnotation

Triggered when an annotation is about to be deleted from the document by the tool
Parameters:
Name Type Description
args object Event arguments with event related properties
Properties
Name Type Description
annotation The annotation that will be deleted
skipAnnotation Annotations.FreeHandAnnotation A function you can call to skip deleting the annotation or points from a
Example
const eraserTool = docViewer.getTool('AnnotationEraserTool');

    eraserTool.on('erasingAnnotation', function(args) {
      // Make eraser tool skip deleting rectangle annotations
      if (args.annotation instanceof Annotations.RectangleAnnotation) {
        args.skipAnnotation();
      }
    });