/**
* Pan by a number of pixels (relative pan)
*
* @param dX
* @param dY
* @return True if the pan changed the view (did not move view out of bounds); false otherwise
*/
boolean pan(int dX, int dY) {
// We only pan if the current scaling is able to pan.
if (scaling != null && !scaling.isAbleToPan()) return false;
double scale = getScale();
double sX = (double) dX / scale;
double sY = (double) dY / scale;
if (absoluteXPosition + sX < 0)
// dX = diff to 0
sX = -absoluteXPosition;
if (absoluteYPosition + sY < 0) sY = -absoluteYPosition;
// Prevent panning right or below desktop image
if (absoluteXPosition + getVisibleWidth() + sX > getImageWidth())
sX = getImageWidth() - getVisibleWidth() - absoluteXPosition;
if (absoluteYPosition + getVisibleHeight() + sY > getImageHeight())
sY = getImageHeight() - getVisibleHeight() - absoluteYPosition;
absoluteXPosition += sX;
absoluteYPosition += sY;
if (sX != 0.0 || sY != 0.0) {
// scrollBy((int)sX, (int)sY);
scrollToAbsolute();
return true;
}
return false;
}
/** Make sure mouse is visible on displayable part of screen */
public void panToMouse() {
if (rfbconn == null) return;
boolean panX = true;
boolean panY = true;
// Don't pan in a certain direction if dimension scaled is already less
// than the dimension of the visible part of the screen.
if (rfbconn.framebufferWidth() <= getVisibleWidth()) panX = false;
if (rfbconn.framebufferHeight() <= getVisibleHeight()) panY = false;
// We only pan if the current scaling is able to pan.
if (scaling != null && !scaling.isAbleToPan()) return;
int x = pointer.getX();
int y = pointer.getY();
boolean panned = false;
int w = getVisibleWidth();
int h = getVisibleHeight();
int iw = getImageWidth();
int ih = getImageHeight();
int wthresh = 30;
int hthresh = 30;
int newX = absoluteXPosition;
int newY = absoluteYPosition;
if (x - absoluteXPosition >= w - wthresh) {
newX = x - (w - wthresh);
if (newX + w > iw) newX = iw - w;
} else if (x < absoluteXPosition + wthresh) {
newX = x - wthresh;
if (newX < 0) newX = 0;
}
if (panX && newX != absoluteXPosition) {
absoluteXPosition = newX;
panned = true;
}
if (y - absoluteYPosition >= h - hthresh) {
newY = y - (h - hthresh);
if (newY + h > ih) newY = ih - h;
} else if (y < absoluteYPosition + hthresh) {
newY = y - hthresh;
if (newY < 0) newY = 0;
}
if (panY && newY != absoluteYPosition) {
absoluteYPosition = newY;
panned = true;
}
if (panned) {
// scrollBy(newX - absoluteXPosition, newY - absoluteYPosition);
scrollToAbsolute();
}
}