javafx.scene.layout.ConstraintsBase Maven / Gradle / Ivy
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package javafx.scene.layout;
import java.util.Iterator;
import javafx.scene.Parent;
import com.sun.javafx.util.WeakReferenceQueue;
/**
* The base class for defining node-specific layout constraints. Region
* classes may create extensions of this class if they need to define their own
* set of layout constraints.
*
* @since JavaFX 2.0
*/
public abstract class ConstraintsBase {
/**
* If set as max value indicates that the pref value should be used as the max.
* This allows an application to constrain a resizable node's size, which normally
* has an unlimited max value, to its preferred size.
*/
public static final double CONSTRAIN_TO_PREF = Double.NEGATIVE_INFINITY;
private WeakReferenceQueue nodes = new WeakReferenceQueue();
ConstraintsBase() {
}
void add(Parent node) {
nodes.add(node);
}
void remove(Parent node) {
nodes.remove(node);
}
/**
* Calls requestLayout on layout parent associated with this constraint object.
*/
protected void requestLayout() {
Iterator nodeIter = nodes.iterator();
while (nodeIter.hasNext()) {
nodeIter.next().requestLayout();
}
}
}