public void mouseMoved(MouseEvent e) {
if (documentViewController != null
&& documentViewController.getDocumentViewModel().getViewToolMode()
== DocumentViewModel.DISPLAY_TOOL_PAN) {
Adjustable verticalScrollbar = documentViewController.getVerticalScrollBar();
Adjustable horizontalScrollbar = documentViewController.getHorizontalScrollBar();
lastMousePosition.setLocation(
e.getPoint().getX() - horizontalScrollbar.getValue(),
e.getPoint().getY() - verticalScrollbar.getValue());
}
}
/**
* Mouse dragged, initiates page panning if the tool is selected.
*
* @param e awt mouse event
*/
public void mouseDragged(MouseEvent e) {
if (documentViewController != null
&& documentViewController.getDocumentViewModel().getViewToolMode()
== DocumentViewModel.DISPLAY_TOOL_PAN) {
// Get data about the current view port position
Adjustable verticalScrollbar = documentViewController.getVerticalScrollBar();
Adjustable horizontalScrollbar = documentViewController.getHorizontalScrollBar();
if (verticalScrollbar != null && horizontalScrollbar != null) {
// calculate how much the view port should be moved
Point p =
new Point(
(int) e.getPoint().getX() - horizontalScrollbar.getValue(),
(int) e.getPoint().getY() - verticalScrollbar.getValue());
int x = (int) (horizontalScrollbar.getValue() - (p.getX() - lastMousePosition.getX()));
int y = (int) (verticalScrollbar.getValue() - (p.getY() - lastMousePosition.getY()));
// apply the pan
horizontalScrollbar.setValue(x);
verticalScrollbar.setValue(y);
// update last position holder
lastMousePosition.setLocation(p);
}
}
}
private void scrollByUnit(Adjustable adj, int val) {
if (adj == vAdjustable) {
int visIdx = getCurrentIndex() + val;
selectVisible(visIdx);
} else if (adj == hAdjustable) {
updateAdjValue(adj, val * adj.getUnitIncrement());
}
}
/**
* Called by ScrollPane's internal observer of the scrollpane's adjustables. This is called
* whenever a scroll position is changed in one of adjustables, whether it was modified externally
* or from the native scrollbars themselves.
*/
public void setValue(Adjustable adj, int v) {
Component c = getScrollChild();
if (c == null) {
return;
}
Point p = c.getLocation();
switch (adj.getOrientation()) {
case Adjustable.VERTICAL:
setScrollPosition(-(p.x), v);
break;
case Adjustable.HORIZONTAL:
setScrollPosition(v, -(p.y));
break;
}
}
private void updateAdjValue(Adjustable adj, final int increment) {
int oldVal = adj.getValue();
adj.setValue(oldVal + increment);
}