/*
* @(#)DragTracker.java 5.1
*
*/
package CH.ifa.draw.standard;
import java.awt.event.MouseEvent;
import CH.ifa.draw.framework.DrawingView;
import CH.ifa.draw.framework.Figure;
import CH.ifa.draw.framework.FigureEnumeration;
/**
* DragTracker implements the dragging of the clicked
* figure.
*
* @see SelectionTool
*/
public class DragTracker extends AbstractTool {
private Figure fAnchorFigure;
private int fLastX, fLastY; // previous mouse position
private boolean fMoved = false;
public DragTracker(DrawingView view, Figure anchor) {
super(view);
fAnchorFigure = anchor;
}
public void mouseDown(MouseEvent e, int x, int y) {
super.mouseDown(e, x, y);
fLastX = x;
fLastY = y;
if (e.isShiftDown()) {
view().toggleSelection(fAnchorFigure);
fAnchorFigure = null;
} else if (!view().selection().contains(fAnchorFigure)) {
view().clearSelection();
view().addToSelection(fAnchorFigure);
}
}
public void mouseDrag(MouseEvent e, int x, int y) {
super.mouseDrag(e, x, y);
fMoved = (Math.abs(x - fAnchorX) > 4) || (Math.abs(y - fAnchorY) > 4);
if (fMoved) {
FigureEnumeration figures = view().selectionElements();
while (figures.hasMoreElements())
figures.nextFigure().moveBy(x - fLastX, y - fLastY);
}
fLastX = x;
fLastY = y;
}
}