// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.actions;
import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
import static org.openstreetmap.josm.tools.I18n.tr;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;
import org.openstreetmap.josm.tools.Shortcut;
/**
* Undoes the last command.
*
* @author imi
*/
public class UndoAction extends JosmAction implements OsmDataLayer.CommandQueueListener {
/**
* Construct the action with "Undo" as label.
*/
public UndoAction() {
super(tr("Undo"), "undo", tr("Undo the last action."),
Shortcut.registerShortcut("system:undo", tr("Edit: {0}", tr("Undo")), KeyEvent.VK_Z, Shortcut.CTRL), true);
setEnabled(false);
putValue("help", ht("/Action/Undo"));
}
@Override
public void actionPerformed(ActionEvent e) {
if (Main.map == null)
return;
Main.map.repaint();
Main.main.undoRedo.undo();
}
@Override
protected void updateEnabledState() {
setEnabled(Main.main != null && !Main.main.undoRedo.commands.isEmpty());
}
@Override
public void commandChanged(int queueSize, int redoSize) {
if (Main.main.undoRedo.commands.isEmpty()) {
putValue(NAME, tr("Undo"));
setTooltip(tr("Undo the last action."));
} else {
putValue(NAME, tr("Undo ..."));
setTooltip(tr("Undo {0}",
Main.main.undoRedo.commands.getLast().getDescriptionText()));
}
}
}