/**
* Shows a tool tip over the upper left corner of the viewport with the contents of the pannable
* view's pannable tip text (typically a string identifiying the corner point). Tip is removed
* after a short delay.
*/
public void showPanTip() {
String tipText = null;
Point upperLeft = new Point(0, 0);
JViewport vp = getEnclosingViewport();
if (!isPannableUnbounded() && vp != null) upperLeft = vp.getViewPosition();
Location loc = locationForPoint(upperLeft);
if (loc != null) tipText = getToolTipText(loc);
showTip(tipText, getLocation());
}
/**
* Moves the current location by a given amount.
*
* @param dr the number of rows by which to move the location
* @param dc the number of columns by which to move the location
*/
public void moveLocation(int dr, int dc) {
Location newLocation =
new Location(currentLocation.getRow() + dr, currentLocation.getCol() + dc);
if (!grid.isValid(newLocation)) return;
currentLocation = newLocation;
JViewport viewPort = getEnclosingViewport();
if (isPannableUnbounded()) {
if (originRow > currentLocation.getRow()) originRow = currentLocation.getRow();
if (originCol > currentLocation.getCol()) originCol = currentLocation.getCol();
Dimension dim = viewPort.getSize();
int rows = dim.height / (cellSize + 1);
int cols = dim.width / (cellSize + 1);
if (originRow + rows - 1 < currentLocation.getRow())
originRow = currentLocation.getRow() - rows + 1;
if (originCol + rows - 1 < currentLocation.getCol())
originCol = currentLocation.getCol() - cols + 1;
} else if (viewPort != null) {
int dx = 0;
int dy = 0;
Point p = pointForLocation(currentLocation);
Rectangle locRect =
new Rectangle(p.x - cellSize / 2, p.y - cellSize / 2, cellSize + 1, cellSize + 1);
Rectangle viewRect = viewPort.getViewRect();
if (!viewRect.contains(locRect)) {
while (locRect.x < viewRect.x + dx) dx -= cellSize + 1;
while (locRect.y < viewRect.y + dy) dy -= cellSize + 1;
while (locRect.getMaxX() > viewRect.getMaxX() + dx) dx += cellSize + 1;
while (locRect.getMaxY() > viewRect.getMaxY() + dy) dy += cellSize + 1;
Point pt = viewPort.getViewPosition();
pt.x += dx;
pt.y += dy;
viewPort.setViewPosition(pt);
}
}
repaint();
showTip(getToolTipText(currentLocation), pointForLocation(currentLocation));
}