How to manage your PDF Pages using Foxit PDF SDK (Java)

In PDF development, a PDF page means much more than in the final user’s PDF editor or viewer. Page objects help group and identify multiple objects in the PDF to perform other operations. A PDFPage object is retrieved from a PDF document by function PDFDoc.getPage. Page level APIs provide functions to parse, render, edit (includes creating, deleting and flattening) a page, retrieve PDF annotations, read and set the properties of a page, and more. For most cases, a PDF page needs to be parsed before it is rendered or processed.

In this article, we will provide sample code examples for handling your pages using Foxit PDF SDK:

Example:

How to get page size

import static com.foxit.sdk.pdf.PDFPage.*;
...
// Assuming PDFPage page has been loaded and parsed.
...
int width = (int) page.getWidth();
int height = (int) page.getHeight();
...

How to calculate bounding box of page contents

import static com.foxit.sdk.pdf.PDFPage.*;
...
// Assuming PDFPage page has been loaded and parsed.
...
RectF calcRc = page.calcContentBBox(e_CalcContentsBox);
float fcalcRc = calcRc.width();
float fcalcRcHeight = calcRc.height();

How to create a PDF page and set the size

import static com.foxit.sdk.pdf.PDFPage.*;
...
// Assuming PDFDoc doc has been loaded.
// Insert a new blank PDF page to document, which will be inserted to the first page.
PDFPage newBlankPage = doc.insertPage(-1, 500, 800);
// Insert a new blank PDF page to document, which will be inserted at index 1.
PDFPage newBlankPage = doc.insertPage(1, 500, 800);
// Insert a new blank PDF page to document, which will be inserted to the end.
PDFPage newBlankPage = doc.insertPage(doc.getPageCount(), e_SizeLetter);

How to delete a PDF page

import static com.foxit.sdk.pdf.PDFDoc.*;
...
// Assuming PDFDoc doc has been loaded.
// Remove a PDF page by page index.
doc.removePage(index);
// Remove a specified PDF page.
doc.removePage(page);
...

How to flatten a PDF page

import static com.foxit.sdk.pdf.PDFPage.*;
...
// Assuming PDFPage page has been loaded and parsed.
// Flatten all contents of a PDF page.
page.flatten(true, e_FlattenAll);
// Flatten a PDF page without annotations.
page.flatten(true, e_FlattenNoAnnot);
// Flatten a PDF page without form controls.
page.flatten(true, e_FlattenNoFormControl);
// Flatten a PDF page without annotations and form controls (Equals to nothing to be flattened).
page.flatten(true, e_FlattenNoAnnot | e_FlattenNoFormControl);
...

How to get and set page thumbnails in a PDF document

import static com.foxit.sdk.pdf.PDFPage.*;
...
// Assuming PDFPage page has been loaded and parsed.
...
// Load the thumbnail bitmap. If the return value of function db.isEmpty() is true means no thumbnail can be found.
Bitmap db = page.loadThumbnail();
if (!db.isEmpty())
{
    int dbWidth = db.getWidth();
int dbHeight = db.getHeight();
}
// Set page thumbnail, db should be a valid bitmap.
page.setThumbnail(db);
...