/**
* Called to set the URL to browse, and reset the scrollbars.
*
* @param url indicates document to view.
* @throws IOException if an error occures
*/
public void setURL(final URL url) throws IOException {
final URL old = getURL();
super.setURL(url);
if (old == null) {
// bcr getImageWait().setBufferMode(DjVuImage.COMPLETE_BUFFER);
setScrollbar(Scrollbar.HORIZONTAL, new Scrollbar(Scrollbar.HORIZONTAL));
setScrollbar(Scrollbar.VERTICAL, new Scrollbar(Scrollbar.VERTICAL));
hScroll.setUnitIncrement(16);
vScroll.setUnitIncrement(16);
}
}
/**
* Called to process scrollbar events.
*
* @param event to process.
*/
public void adjustmentValueChanged(AdjustmentEvent event) {
try {
final Scrollbar hScroll = getScrollbar(Scrollbar.HORIZONTAL);
final Scrollbar vScroll = getScrollbar(Scrollbar.VERTICAL);
final Point scrollPosition = getScrollPosition();
setScrollPosition(
(hScroll != null) ? hScroll.getValue() : scrollPosition.x,
(vScroll != null) ? vScroll.getValue() : scrollPosition.y);
} catch (final Throwable exp) {
exp.printStackTrace(DjVuOptions.err);
System.gc();
}
}
// Called to update the scrollbar properties.
private void updateScrollbars() {
final DjVuImage image = getImage();
if (image != null) {
final Dimension viewportSize = getViewportSize();
final Dimension imageSize = image.getSize();
final Point scrollPosition = getScrollPosition();
final Scrollbar hScroll = getScrollbar(Scrollbar.HORIZONTAL);
final Scrollbar vScroll = getScrollbar(Scrollbar.VERTICAL);
if (hScroll != null) {
hScroll.setValues(scrollPosition.x, viewportSize.width, 0, imageSize.width);
}
if (vScroll != null) {
vScroll.setValues(scrollPosition.y, viewportSize.height, 0, imageSize.height);
}
}
}
/**
* Set either the horizontal or vertical scrollbar.
*
* @param orientation either Scrollbar.HORIZONTAL or Scrollbar.VERTICAL
* @param scrollbar component.
*/
public void setScrollbar(int orientation, Scrollbar scrollbar) {
if (orientation == Scrollbar.HORIZONTAL) {
hScroll = scrollbar;
} else {
vScroll = scrollbar;
}
scrollbar.addAdjustmentListener(this);
updateScrollbars();
}