/**
* @param x x coordinate in PDF units
* @param y y coordinate in PDF units
* @param centre if true, centre this location in the viewport, otherwise cause it to be displayed
* at the top left of the viewport.
*/
private void ensureVisible(PDFPage page, double x, double y, boolean centre) {
PDFPage oldPage = view.getPage();
Collection<PagePanel> oldPagePanels = view.getPagePanels();
view.setPage(page, false);
Rectangle pageRect = view.getPageRectangle(page);
if (pageRect != null) {
Rectangle2D crop = PagePanel.getFullPageView(page);
int xoffset = pageRect.x, yoffset = pageRect.y;
if (x > crop.getMinX()) { // Also confirms !NaN
xoffset += pointsToPixels((float) (Math.min(crop.getMaxX(), x) - crop.getMinX()));
}
if (y < crop.getMaxY()) { // Also confirms !NaN
yoffset += pointsToPixels((float) (crop.getHeight() - Math.max(0, y - crop.getMinY())));
}
JScrollBar hsb = scrollPane.getHorizontalScrollBar();
JScrollBar vsb = scrollPane.getVerticalScrollBar();
if (centre) {
xoffset -= hsb.getVisibleAmount() / 2;
yoffset -= vsb.getVisibleAmount() / 2;
}
if (getPagePanel() != null && getPagePanel().getClip() != null) {
hsb.setValue(xoffset); // Don't want to smooth scroll if we're clipping
vsb.setValue(yoffset); // the page rectangles.
} else {
smoothScroll(xoffset, yoffset, hsb, vsb);
}
}
if (page != oldPage) {
DocumentPanel docpanel = getDocumentPanel();
if (docpanel != null) {
DocumentPanelEvent dpe = DocumentPanelEvent.createPageChanged(docpanel);
dpe.setPreviousPage(oldPage);
docpanel.raiseDocumentPanelEvent(dpe);
}
Collection<PagePanel> newPagePanels = view.getPagePanels();
for (Iterator<PagePanel> i = oldPagePanels.iterator(); i.hasNext(); ) {
PagePanel oldPagePanel = i.next();
if (!newPagePanels.contains(oldPagePanel)) {
oldPagePanel.raisePagePanelEvent(PagePanelEvent.createPageHidden(oldPagePanel, oldPage));
}
}
for (Iterator<PagePanel> i = newPagePanels.iterator(); i.hasNext(); ) {
PagePanel newPagePanel = i.next();
if (!oldPagePanels.contains(newPagePanel)) {
newPagePanel.raisePagePanelEvent(PagePanelEvent.createPageVisible(newPagePanel, page));
}
}
}
}
public void adjustmentValueChanged(AdjustmentEvent e) {
if (enabled) {
view.revalidate(); // NB this is required for Windows to actually call doLayout
view.repaint();
DocumentPanel docpanel = getDocumentPanel();
if (docpanel != null && !isSmoothScrolling()) {
docpanel.raiseDocumentPanelEvent(DocumentPanelEvent.createPagePositionChanged(docpanel));
}
}
}