Override the Ink Signature Dialog

PSPDFKit.load(configuration).then((instance) => {
  function fitIn(size, containerSize) {
    const { width, height } = size;

    const widthRatio = containerSize.width / width;
    const heightRatio = containerSize.height / height;

    const ratio = Math.min(widthRatio, heightRatio);

    return {
      width: width * ratio,
      height: height * ratio
    };
  }

  let currentInkSignatureWidget;

  instance.addEventListener("annotations.press", (event) => {
    if (
      event.annotation instanceof PSPDFKit.Annotations.WidgetAnnotation
    ) {
      currentInkSignatureWidget = event.annotation;
      event.preventDefault();
      instance.setViewState((viewState) =>
        viewState.set(
          "interactionMode",
          PSPDFKit.InteractionMode.INK_SIGNATURE
        )
      );
    }
  });

  instance.addEventListener("annotations.create", (annotations) => {
    const annotation = annotations.first();
    if (
      annotation instanceof PSPDFKit.Annotations.InkAnnotation &&
      annotation.isSignature
    ) {
      if (currentInkSignatureWidget) {
        const newSize = fitIn(
          {
            width: annotation.boundingBox.width,
            height: annotation.boundingBox.height
          },
          {
            width: currentInkSignatureWidget.boundingBox.width,
            height: currentInkSignatureWidget.boundingBox.height
          }
        );
        const resizeRatio =
          newSize.width / annotation.boundingBox.width;
        const newLeft =
          currentInkSignatureWidget.boundingBox.left +
          currentInkSignatureWidget.boundingBox.width / 2 -
          newSize.width / 2;
        const newTop =
          currentInkSignatureWidget.boundingBox.top +
          currentInkSignatureWidget.boundingBox.height / 2 -
          newSize.height / 2;
        const newLines = annotation.lines.map((line) => {
          return line.map((point) => {
            return new PSPDFKit.Geometry.DrawingPoint({
              x:
                newLeft +
                (point.x - annotation.boundingBox.left) * resizeRatio,
              y:
                newTop +
                (point.y - annotation.boundingBox.top) * resizeRatio
            });
          });
        });
        const newBoundingBox = new PSPDFKit.Geometry.Rect({
          left: newLeft,
          top: newTop,
          width: newSize.width,
          height: newSize.height
        });
        instance.update(
          annotation
            .set("boundingBox", newBoundingBox)
            .set("lines", newLines)
            .set("lineWidth", annotation.lineWidth * resizeRatio)
        );
        currentInkSignatureWidget = null;
      }
    }
  });
});