/**
* Defaults to typical marquee behaviour unless a flow relation is being drawn. In that case, each
* drag event will redraw a line from the mouse cursor to the source port. If there is a valid
* incoming port under the mouse, this will also be highlighted to identify that a valid flow may
* be drawn upon a mouse release event.
*/
public void mouseDragged(MouseEvent event) {
if (paletteBar.getState() == Palette.SelectionState.MARQUEE) {
super.mouseDragged(event);
return;
}
if (state == State.DRAWING_FLOW_RELATION) {
if (sourcePort != null) {
setCurrentPoint(getNet().snap(event.getPoint()));
paintPotentialFlow();
PortView portUnderMouse = getPortViewAt(event.getPoint());
if (portUnderMouse != null
&& portUnderMouse != sourcePort
&& connectionAllowable(sourcePort, portUnderMouse)
&& acceptsIncomingFlows(portUnderMouse)) {
if (portUnderMouse != targetPort) {
targetPort = portUnderMouse;
getOverlay().setTarget(net.toScreen(targetPort.getBounds()));
}
}
if (portUnderMouse == null) {
targetPort = null;
getOverlay().setTarget(null);
}
}
event.consume();
}
}
protected void paintPort(PortView port, boolean show) {
if (port != null) {
Rectangle2D portBounds = net.toScreen(port.getBounds());
getOverlay().setMouseOverPort(show ? portBounds : null);
getOverlay().setScale(getNet().getScale());
net.repaint(
(int) portBounds.getX() - 1,
(int) portBounds.getY() - 1,
(int) portBounds.getWidth() + 2,
(int) portBounds.getHeight() + 2);
}
}