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* If the key is not declared by the figure, then the value will always be null.
*
* @param the value type of the property
* @author Werner Randelshofer
*/
public class DrawingModelFigureProperty extends ReadOnlyObjectWrapper {
private final DrawingModel model;
protected final @Nullable WeakReference figure;
private final @Nullable Key key;
private final @Nullable Listener modelListener;
private final @Nullable SimpleWeakListener weakListener;
private final boolean isDeclaredKey;
public DrawingModelFigureProperty(DrawingModel model, Figure figure, Key key) {
this(model, figure, key, false);
}
public DrawingModelFigureProperty(DrawingModel model, @Nullable Figure figure, @Nullable Key key, boolean allKeys) {
this.model = model;
this.key = key;
this.figure = new WeakReference<>(figure);
this.isDeclaredKey = figure != null && Figure.getDeclaredAndInheritedMapAccessors(figure.getClass()).contains(key);
if (key != null) {
this.modelListener = (event) -> {
DrawingModelEvent.EventType eventType = event.getEventType();
if (event.getEventType() == DrawingModelEvent.EventType.PROPERTY_VALUE_CHANGED
&& this.figure.get() == event.getNode()) {
if (this.key == event.getKey()) {
@SuppressWarnings("unchecked")
T newValue = event.getNewValue();
if (super.get() != newValue) {
set(newValue);
}
} else if (allKeys) {
updateValue();
}
}
};
model.addDrawingModelListener(weakListener = new SimpleWeakListener<>(modelListener, model::removeDrawingModelListener));
} else {
modelListener = null;
weakListener = null;
}
}
@Override
public @Nullable T getValue() {
Figure f = figure.get();
@SuppressWarnings("unchecked")
T temp = isDeclaredKey && f != null && key != null ? f.get(key) : null;
return temp;
}
@Override
public void setValue(@Nullable T value) {
if (isDeclaredKey && figure != null && key != null) {
if (value != null && !key.isAssignable(value)) {
throw new IllegalArgumentException("value is not assignable " + value);
}
Figure f = this.figure.get();
if (f != null) {
model.set(f, key, value);
}
}
// Note: super must be called after "put", so that listeners
// can be properly informed.
super.setValue(value);
}
@Override
public void unbind() {
super.unbind();
model.removeDrawingModelListener(weakListener);
}
/**
* This implementation is empty.
*/
protected void updateValue() {
}
}
