/* Copyright (C) 2005-2011 Fabio Riccardi */
package com.lightcrafts.app.menu;
import com.lightcrafts.app.ComboFrame;
import com.lightcrafts.model.Scale;
import com.lightcrafts.ui.editor.Document;
import com.lightcrafts.ui.editor.ScaleListener;
import com.lightcrafts.ui.editor.ScaleModel;
import java.awt.event.ActionEvent;
import java.lang.ref.WeakReference;
final class Zoom1To1MenuItem extends DocumentMenuItem implements ScaleListener {
final static Scale Unity = new Scale(1, 1);
WeakReference<Document> docRef = new WeakReference<Document>(null);
Zoom1To1MenuItem(ComboFrame frame) {
super(frame, "Zoom11");
setEnabled(false);
}
void update() {
Document newDoc = getDocument();
Document oldDoc = docRef.get();
if (newDoc != oldDoc) {
if (oldDoc != null) {
ScaleModel model = oldDoc.getScaleModel();
model.removeScaleListener(this);
}
if (newDoc != null) {
ScaleModel model = newDoc.getScaleModel();
model.addScaleListener(this);
setEnabled(model.canScaleUp());
}
else {
setEnabled(false);
}
docRef = new WeakReference<Document>(newDoc);
}
}
public void actionPerformed(ActionEvent event) {
performPreAction( event );
Document doc = getDocument();
ScaleModel model = doc.getScaleModel();
model.setScale(Unity);
}
public void scaleChanged(Scale scale) {
boolean isUnity = scale.equals(Unity);
setEnabled(! isUnity);
}
}