// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.actions;
import static org.openstreetmap.josm.tools.I18n.tr;
import java.util.Collection;
import javax.swing.AbstractAction;
import javax.swing.JComponent;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.SelectionChangedListener;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.PrimitiveDeepCopy;
import org.openstreetmap.josm.gui.MapView;
import org.openstreetmap.josm.gui.layer.Layer;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;
import org.openstreetmap.josm.tools.Destroyable;
import org.openstreetmap.josm.tools.ImageProvider;
import org.openstreetmap.josm.tools.Shortcut;
/**
* Base class helper for all Actions in JOSM. Just to make the life easier.
*
* A JosmAction is a {@see LayerChangeListener} and a {@see SelectionChangedListener}. Upon
* a layer change event or a selection change event it invokes {@see #updateEnabled()}.
* Subclasses can override {@see #updateEnabled()} in order to update the {@see #isEnabled()}-state
* of a JosmAction depending on the {@see #getCurrentDataSet()} and the current layers
* (see also {@see #getEditLayer()}).
*
* destroy() from interface Destroyable is called e.g. for MapModes, when the last layer has
* been removed and so the mapframe will be destroyed. For other JosmActions, destroy() may never
* be called (currently).
*
* @author imi
*/
abstract public class JosmAction extends AbstractAction implements Destroyable {
protected Shortcut sc;
private LayerChangeAdapter layerChangeAdapter;
private SelectionChangeAdapter selectionChangeAdapter;
public Shortcut getShortcut() {
if (sc == null) {
sc = Shortcut.registerShortcut("core:none", tr("No Shortcut"), 0, Shortcut.GROUP_NONE);
// as this shortcut is shared by all action that don't want to have a shortcut,
// we shouldn't allow the user to change it...
// this is handled by special name "core:none"
}
return sc;
}
/**
* The new super for all actions.
*
* Use this super constructor to setup your action. It takes 5 parameters:
*
* @param name the action's text as displayed on the menu (if it is added to a menu)
* @param iconName the filename of the icon to use
* @param tooltip a longer description of the action that will be displayed in the tooltip. Please note
* that html is not supported for menu actions on some platforms.
* @param shortcut a ready-created shortcut object or null if you don't want a shortcut. But you always
* do want a shortcut, remember you can always register it with group=none, so you
* won't be assigned a shortcut unless the user configures one. If you pass null here,
* the user CANNOT configure a shortcut for your action.
* @param register register this action for the toolbar preferences?
*/
public JosmAction(String name, String iconName, String tooltip, Shortcut shortcut, boolean register) {
super(name, iconName == null ? null : ImageProvider.get(iconName));
setHelpId();
sc = shortcut;
if (sc != null) {
Main.contentPane.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(sc.getKeyStroke(), name);
Main.contentPane.getActionMap().put(name, this);
}
putValue(SHORT_DESCRIPTION, Main.platform.makeTooltip(tooltip, sc));
putValue("toolbar", iconName);
if (register) {
Main.toolbar.register(this);
}
installAdapters();
}
public JosmAction() {
setHelpId();
installAdapters();
}
public void destroy() {
if (sc != null) {
Main.contentPane.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).remove(sc.getKeyStroke());
Main.contentPane.getActionMap().remove(sc.getKeyStroke());
}
MapView.removeLayerChangeListener(layerChangeAdapter);
DataSet.selListeners.remove(selectionChangeAdapter);
}
/**
* needs to be overridden to be useful
*/
public void pasteBufferChanged(PrimitiveDeepCopy newPasteBuffer) {
return;
}
/**
* needs to be overridden to be useful
*/
public void addListener(JosmAction a) {
return;
}
private void setHelpId() {
String helpId = "Action/"+getClass().getName().substring(getClass().getName().lastIndexOf('.')+1);
if (helpId.endsWith("Action")) {
helpId = helpId.substring(0, helpId.length()-6);
}
putValue("help", helpId);
}
/**
* Replies the current edit layer
*
* @return the current edit layer. null, if no edit layer exists
*/
protected OsmDataLayer getEditLayer() {
return Main.main.getEditLayer();
}
/**
* Replies the current dataset
*
* @return the current dataset. null, if no current dataset exists
*/
protected DataSet getCurrentDataSet() {
return Main.main.getCurrentDataSet();
}
protected void installAdapters() {
// make this action listen to layer change and selection change events
//
layerChangeAdapter = new LayerChangeAdapter();
selectionChangeAdapter = new SelectionChangeAdapter();
MapView.addLayerChangeListener(layerChangeAdapter);
DataSet.selListeners.add(selectionChangeAdapter);
initEnabledState();
}
/**
* Override in subclasses to init the enabled state of an action when it is
* created. Default behaviour is to call {@see #updateEnabledState()}
*
* @see #updateEnabledState()
* @see #updateEnabledState(Collection)
*/
protected void initEnabledState() {
updateEnabledState();
}
/**
* Override in subclasses to update the enabled state of the action when
* something in the JOSM state changes, i.e. when a layer is removed or added.
*
* See {@see #updateEnabledState(Collection)} to respond to changes in the collection
* of selected primitives.
*
* Default behavior is empty.
*
* @see #updateEnabledState(Collection)
* @see #initEnabledState()
*/
protected void updateEnabledState() {
}
/**
* Override in subclasses to update the enabled state of the action if the
* collection of selected primitives changes. This method is called with the
* new selection. Avoid calling getCurrentDataSet().getSelected() because this
* loops over the complete data set.
*
* @param selection the collection of selected primitives
*
* @see #updateEnabledState()
* @see #initEnabledState()
*/
protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
}
/**
* Adapter for layer change events
*
*/
private class LayerChangeAdapter implements MapView.LayerChangeListener {
public void activeLayerChange(Layer oldLayer, Layer newLayer) {
updateEnabledState();
}
public void layerAdded(Layer newLayer) {
updateEnabledState();
}
public void layerRemoved(Layer oldLayer) {
updateEnabledState();
}
}
/**
* Adapter for selection change events
*
*/
private class SelectionChangeAdapter implements SelectionChangedListener {
public void selectionChanged(Collection<? extends OsmPrimitive> newSelection) {
updateEnabledState(newSelection);
}
}
}