Guides

Edit Form Fields

Retrieve and edit the appearance and content of form fields.

Note that the properties of different form field types may not be entirely consistent.

The steps to edit a form field are as follows:

1. Obtain the form object to be edited.

2. Modify the form properties.

3. Update the form appearance.

This example shows how to edit form fields:

java

CPDFTextWidget textWidget = (CPDFTextWidget) cpdfWidget;
textWidget.setFillColor(Color.RED);
textWidget.updateAp();

kotlin

val textWidget = myCPDFWidget as CPDFTextWidget
textWidget.setFillColor(Color.RED)
textWidget.updateAp()

ReaderView Synchronization

If the current PDF is being displayed via CPDFReaderView, and the target page is loaded or currently visible on screen, you need to use CPDFPageView to refresh the appearance of the corresponding form.

Only pages that are displayed or about to be displayed will have a CPDFPageView. Make sure to check for null.

CPDFPageView pageView = (CPDFPageView) readerView.getChild(pageIndex);

if (pageView != null) {
  CPDFAnnotImpl annotationImpl = pageView.getAnnotImpl(textWidget);
  annotationImpl.onAnnotAttrChange();
  pageView.invalidate();
}

val pageView = readerView.getChild(pageIndex) as? CPDFPageView

pageView?.let { view ->
    val annotationImpl = view.getAnnotImpl(annotation)
    annotationImpl.onAnnotAttrChange()
    view.invalidate()
}