source: josm/trunk/src/org/openstreetmap/josm/actions/JosmAction.java@ 6453

Last change on this file since 6453 was 6380, checked in by Don-vip, 10 years ago

update license/copyright information
  • Property svn:eol-style set to native
File size: 9.8 KB
Line 
1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.actions;
3
4import static org.openstreetmap.josm.tools.I18n.tr;
5
6import java.awt.event.KeyEvent;
7import java.util.Collection;
8
9import javax.swing.AbstractAction;
10import javax.swing.Icon;
11
12import org.openstreetmap.josm.Main;
13import org.openstreetmap.josm.data.SelectionChangedListener;
14import org.openstreetmap.josm.data.osm.DataSet;
15import org.openstreetmap.josm.data.osm.OsmPrimitive;
16import org.openstreetmap.josm.gui.MapView;
17import org.openstreetmap.josm.gui.MapView.LayerChangeListener;
18import org.openstreetmap.josm.gui.layer.Layer;
19import org.openstreetmap.josm.gui.layer.OsmDataLayer;
20import org.openstreetmap.josm.gui.util.GuiHelper;
21import org.openstreetmap.josm.tools.Destroyable;
22import org.openstreetmap.josm.tools.ImageProvider;
23import org.openstreetmap.josm.tools.Shortcut;
24
25/**
26 * Base class helper for all Actions in JOSM. Just to make the life easier.
27 *
28 * A JosmAction is a {@link LayerChangeListener} and a {@link SelectionChangedListener}. Upon
29 * a layer change event or a selection change event it invokes {@link #updateEnabledState()}.
30 * Subclasses can override {@link #updateEnabledState()} in order to update the {@link #isEnabled()}-state
31 * of a JosmAction depending on the {@link #getCurrentDataSet()} and the current layers
32 * (see also {@link #getEditLayer()}).
33 *
34 * destroy() from interface Destroyable is called e.g. for MapModes, when the last layer has
35 * been removed and so the mapframe will be destroyed. For other JosmActions, destroy() may never
36 * be called (currently).
37 *
38 * @author imi
39 */
40abstract public class JosmAction extends AbstractAction implements Destroyable {
41
42 protected Shortcut sc;
43 private LayerChangeAdapter layerChangeAdapter;
44 private SelectionChangeAdapter selectionChangeAdapter;
45
46 public Shortcut getShortcut() {
47 if (sc == null) {
48 sc = Shortcut.registerShortcut("core:none", tr("No Shortcut"), KeyEvent.CHAR_UNDEFINED, Shortcut.NONE);
49 // as this shortcut is shared by all action that don't want to have a shortcut,
50 // we shouldn't allow the user to change it...
51 // this is handled by special name "core:none"
52 }
53 return sc;
54 }
55
56 /**
57 * Constructs a {@code JosmAction}.
58 *
59 * @param name the action's text as displayed on the menu (if it is added to a menu)
60 * @param icon the icon to use
61 * @param tooltip a longer description of the action that will be displayed in the tooltip. Please note
62 * that html is not supported for menu actions on some platforms.
63 * @param shortcut a ready-created shortcut object or null if you don't want a shortcut. But you always
64 * do want a shortcut, remember you can always register it with group=none, so you
65 * won't be assigned a shortcut unless the user configures one. If you pass null here,
66 * the user CANNOT configure a shortcut for your action.
67 * @param registerInToolbar register this action for the toolbar preferences?
68 * @param toolbarId identifier for the toolbar preferences. The iconName is used, if this parameter is null
69 * @param installAdapters false, if you don't want to install layer changed and selection changed adapters
70 */
71 public JosmAction(String name, Icon icon, String tooltip, Shortcut shortcut, boolean registerInToolbar, String toolbarId, boolean installAdapters) {
72 super(name, icon);
73 setHelpId();
74 sc = shortcut;
75 if (sc != null) {
76 Main.registerActionShortcut(this, sc);
77 }
78 setTooltip(tooltip);
79 if (getValue("toolbar") == null) {
80 putValue("toolbar", toolbarId);
81 }
82 if (registerInToolbar) {
83 Main.toolbar.register(this);
84 }
85 if (installAdapters) {
86 installAdapters();
87 }
88 }
89
90 /**
91 * The new super for all actions.
92 *
93 * Use this super constructor to setup your action.
94 *
95 * @param name the action's text as displayed on the menu (if it is added to a menu)
96 * @param iconName the filename of the icon to use
97 * @param tooltip a longer description of the action that will be displayed in the tooltip. Please note
98 * that html is not supported for menu actions on some platforms.
99 * @param shortcut a ready-created shortcut object or null if you don't want a shortcut. But you always
100 * do want a shortcut, remember you can always register it with group=none, so you
101 * won't be assigned a shortcut unless the user configures one. If you pass null here,
102 * the user CANNOT configure a shortcut for your action.
103 * @param registerInToolbar register this action for the toolbar preferences?
104 * @param toolbarId identifier for the toolbar preferences. The iconName is used, if this parameter is null
105 * @param installAdapters false, if you don't want to install layer changed and selection changed adapters
106 */
107 public JosmAction(String name, String iconName, String tooltip, Shortcut shortcut, boolean registerInToolbar, String toolbarId, boolean installAdapters) {
108 this(name, iconName == null ? null : ImageProvider.get(iconName), tooltip, shortcut, registerInToolbar,
109 toolbarId == null ? iconName : toolbarId, installAdapters);
110 }
111
112 public JosmAction(String name, String iconName, String tooltip, Shortcut shortcut, boolean registerInToolbar, boolean installAdapters) {
113 this(name, iconName, tooltip, shortcut, registerInToolbar, null, installAdapters);
114 }
115
116 public JosmAction(String name, String iconName, String tooltip, Shortcut shortcut, boolean registerInToolbar) {
117 this(name, iconName, tooltip, shortcut, registerInToolbar, null, true);
118 }
119
120 public JosmAction() {
121 this(true);
122 }
123
124 public JosmAction(boolean installAdapters) {
125 setHelpId();
126 if (installAdapters) {
127 installAdapters();
128 }
129 }
130
131 @Override
132 public void destroy() {
133 if (sc != null) {
134 Main.unregisterActionShortcut(this);
135 }
136 MapView.removeLayerChangeListener(layerChangeAdapter);
137 DataSet.removeSelectionListener(selectionChangeAdapter);
138 }
139
140 private void setHelpId() {
141 String helpId = "Action/"+getClass().getName().substring(getClass().getName().lastIndexOf('.')+1);
142 if (helpId.endsWith("Action")) {
143 helpId = helpId.substring(0, helpId.length()-6);
144 }
145 putValue("help", helpId);
146 }
147
148 public void setTooltip(String tooltip) {
149 if (tooltip != null) {
150 putValue(SHORT_DESCRIPTION, Main.platform.makeTooltip(tooltip, sc));
151 }
152 }
153
154 /**
155 * Replies the current edit layer
156 *
157 * @return the current edit layer. null, if no edit layer exists
158 */
159 protected static OsmDataLayer getEditLayer() {
160 return Main.main.getEditLayer();
161 }
162
163 /**
164 * Replies the current dataset
165 *
166 * @return the current dataset. null, if no current dataset exists
167 */
168 protected static DataSet getCurrentDataSet() {
169 return Main.main.getCurrentDataSet();
170 }
171
172 protected void installAdapters() {
173 // make this action listen to layer change and selection change events
174 //
175 layerChangeAdapter = new LayerChangeAdapter();
176 selectionChangeAdapter = new SelectionChangeAdapter();
177 MapView.addLayerChangeListener(layerChangeAdapter);
178 DataSet.addSelectionListener(selectionChangeAdapter);
179 initEnabledState();
180 }
181
182 /**
183 * Override in subclasses to init the enabled state of an action when it is
184 * created. Default behaviour is to call {@link #updateEnabledState()}
185 *
186 * @see #updateEnabledState()
187 * @see #updateEnabledState(Collection)
188 */
189 protected void initEnabledState() {
190 updateEnabledState();
191 }
192
193 /**
194 * Override in subclasses to update the enabled state of the action when
195 * something in the JOSM state changes, i.e. when a layer is removed or added.
196 *
197 * See {@link #updateEnabledState(Collection)} to respond to changes in the collection
198 * of selected primitives.
199 *
200 * Default behavior is empty.
201 *
202 * @see #updateEnabledState(Collection)
203 * @see #initEnabledState()
204 */
205 protected void updateEnabledState() {
206 }
207
208 /**
209 * Override in subclasses to update the enabled state of the action if the
210 * collection of selected primitives changes. This method is called with the
211 * new selection.
212 *
213 * @param selection the collection of selected primitives; may be empty, but not null
214 *
215 * @see #updateEnabledState()
216 * @see #initEnabledState()
217 */
218 protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
219 }
220
221 /**
222 * Adapter for layer change events
223 *
224 */
225 private class LayerChangeAdapter implements MapView.LayerChangeListener {
226 private void updateEnabledStateInEDT() {
227 GuiHelper.runInEDT(new Runnable() {
228 @Override public void run() {
229 updateEnabledState();
230 }
231 });
232 }
233 @Override
234 public void activeLayerChange(Layer oldLayer, Layer newLayer) {
235 updateEnabledStateInEDT();
236 }
237
238 @Override
239 public void layerAdded(Layer newLayer) {
240 updateEnabledStateInEDT();
241 }
242
243 @Override
244 public void layerRemoved(Layer oldLayer) {
245 updateEnabledStateInEDT();
246 }
247 }
248
249 /**
250 * Adapter for selection change events
251 *
252 */
253 private class SelectionChangeAdapter implements SelectionChangedListener {
254 @Override
255 public void selectionChanged(Collection<? extends OsmPrimitive> newSelection) {
256 updateEnabledState(newSelection);
257 }
258 }
259}
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