public void remove(int index) {
synchronized (treeLock) {
int n = nChildren - 1;
if (index < 0 && index > n) {
return;
}
Component c = children[index];
if ((c.flags & IS_ADD_NOTIFIED) != 0) {
c.removeNotify();
}
if (layoutm != null) {
layoutm.removeLayoutComponent(c);
}
// Remove from container
c.parent = null;
if (index > -1 && index < n) {
System.arraycopy(children, index + 1, children, index, n - index);
}
children[n] = null;
nChildren--;
if ((cntrListener != null) || (eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0) {
AWTEvent.sendEvent(ContainerEvt.getEvent(this, ContainerEvent.COMPONENT_REMOVED, c), false);
}
if ((flags & IS_VALID) != 0) invalidate();
c.flags &= ~IS_PARENT_SHOWING;
c.propagateParentShowing(false);
// Like in addImpl, this wouldn't be required in case we are subsequently
// validated, again. However, native widgets cause a repaint regardless
// of this validation
if ((c.flags & IS_NATIVE_LIKE) != 0) repaint(c.x, c.y, c.width, c.height);
}
}
protected void addImpl(Component child, Object constraints, int index) {
synchronized (treeLock) {
if (index < -1 || index > nChildren) {
throw new IllegalArgumentException("bad index: " + index);
}
// This test isn't done because we actually need this functionality
// for the native windowing system
// else if (child instanceof Window) {
// throw new IllegalArgumentException("component is Window");
// }
else if (child instanceof Container && this.parent == child) {
throw new IllegalArgumentException("child is a bad container");
}
if (child.parent != null) {
child.parent.remove(child);
}
if (children == null) {
children = new Component[3];
} else if (nChildren == children.length) {
Component[] old = children;
children = new Component[nChildren * 2];
System.arraycopy(old, 0, children, 0, nChildren);
}
if (index < 0 || nChildren == 0 || index == nChildren) { // append
children[nChildren] = child;
} else if (index < nChildren) { // insert at index
System.arraycopy(children, index, children, index + 1, nChildren - index);
children[index] = child;
}
nChildren++;
child.parent = this;
if ((flags & IS_VALID) != 0) invalidate();
// if we are already addNotified (this is a subsequent add),
// we immediately have to addNotify the child, too
if ((flags & IS_ADD_NOTIFIED) != 0) {
child.addNotify();
// This isn't required in case we are subsequently validated (what is the
// correct thing to do), but native widgets would cause a repaint regardless
// of that. Comment this out if you believe in correct apps
if ((child.flags & IS_NATIVE_LIKE) != 0) child.repaint();
}
// inherit parent attributes (if not overriden by child)
if ((flags & (IS_PARENT_SHOWING | IS_VISIBLE)) == (IS_PARENT_SHOWING | IS_VISIBLE)) {
child.flags |= IS_PARENT_SHOWING;
child.propagateParentShowing(false);
}
if ((child.flags & IS_BG_COLORED) == 0) child.propagateBgClr(bgClr);
if ((child.flags & IS_FG_COLORED) == 0) child.propagateFgClr(fgClr);
if ((child.flags & IS_FONTIFIED) == 0) child.propagateFont(font);
// Some LayoutManagers track adding/removing components. Since this seems to be
// done after a potential addNotify, inform them here
// (wouldn't it be nice to have a single LayoutManager interface?)
if (layoutm != null) {
if (layoutm instanceof LayoutManager2) {
((LayoutManager2) layoutm).addLayoutComponent(child, constraints);
}
if (constraints instanceof String) {
layoutm.addLayoutComponent((String) constraints, child);
}
}
if ((cntrListener != null) || (eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0) {
AWTEvent.sendEvent(
ContainerEvt.getEvent(this, ContainerEvent.COMPONENT_ADDED, child), false);
}
}
}