private void updatePageNumber() {
int pageIndex = preview.getPageIndex();
int pageCount = preview.getPageCount();
int visiblePageCount = preview.getHorizontalPageCount() * preview.getVerticalPageCount();
String text =
(visiblePageCount > 1
? "Pages "
+ (pageIndex + 1)
+ "-"
+ Math.min(pageCount, pageIndex + visiblePageCount)
: "Page " + (pageIndex + 1))
+ " of "
+ pageCount;
pageNumber.setText(text);
previousPage.setEnabled(pageIndex > 0);
nextPage.setEnabled(pageIndex < pageCount - visiblePageCount);
shell.layout(new Control[] {pageNumber});
}
private void setPreviewPageIndex(int pageIndex) {
preview.setPageIndex(Math.max(Math.min(pageIndex, preview.getPageCount() - 1), 0));
updatePageNumber();
}