public List<Integer> getPageOffsets(CharSequence text, boolean includePageNumbers) {
if (text == null) {
return new ArrayList<Integer>();
}
List<Integer> pageOffsets = new ArrayList<Integer>();
TextPaint textPaint = bookView.getInnerView().getPaint();
int boundedWidth = bookView.getInnerView().getWidth();
LOG.debug("Page width: " + boundedWidth);
StaticLayout layout =
layoutFactory.create(text, textPaint, boundedWidth, bookView.getLineSpacing());
LOG.debug("Layout height: " + layout.getHeight());
layout.draw(new Canvas());
// Subtract the height of the top margin
int pageHeight = bookView.getHeight() - bookView.getVerticalMargin();
if (includePageNumbers) {
String bottomSpace = "0\n";
StaticLayout numLayout =
layoutFactory.create(bottomSpace, textPaint, boundedWidth, bookView.getLineSpacing());
numLayout.draw(new Canvas());
// Subtract the height needed to show page numbers, or the
// height of the margin, whichever is more
pageHeight = pageHeight - Math.max(numLayout.getHeight(), bookView.getVerticalMargin());
} else {
// Just subtract the bottom margin
pageHeight = pageHeight - bookView.getVerticalMargin();
}
LOG.debug("Got pageHeight " + pageHeight);
int totalLines = layout.getLineCount();
int topLineNextPage = -1;
int pageStartOffset = 0;
while (topLineNextPage < totalLines - 1) {
LOG.debug("Processing line " + topLineNextPage + " / " + totalLines);
int topLine = layout.getLineForOffset(pageStartOffset);
topLineNextPage = layout.getLineForVertical(layout.getLineTop(topLine) + pageHeight);
LOG.debug("topLine " + topLine + " / " + topLineNextPage);
if (topLineNextPage == topLine) { // If lines are bigger than can fit on a page
topLineNextPage = topLine + 1;
}
int pageEnd = layout.getLineEnd(topLineNextPage - 1);
LOG.debug("pageStartOffset=" + pageStartOffset + ", pageEnd=" + pageEnd);
if (pageEnd > pageStartOffset) {
if (text.subSequence(pageStartOffset, pageEnd).toString().trim().length() > 0) {
pageOffsets.add(pageStartOffset);
}
pageStartOffset = layout.getLineStart(topLineNextPage);
}
}
return pageOffsets;
}
