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package javax.swing.plaf.basic;

import java.lang.reflect.*;
import javax.swing.*;
import javax.swing.plaf.*;

An ActionMap that populates its contents as necessary. The contents are populated by invoking the loadActionMap method on the passed in Object.
Author:Scott Violet
/** * An ActionMap that populates its contents as necessary. The * contents are populated by invoking the <code>loadActionMap</code> * method on the passed in Object. * * @author Scott Violet */
class LazyActionMap extends ActionMapUIResource {
Object to invoke loadActionMap on. This may be a Class object.
/** * Object to invoke <code>loadActionMap</code> on. This may be * a Class object. */
private transient Object _loader;
Installs an ActionMap that will be populated by invoking the loadActionMap method on the specified Class when necessary.

This should be used if the ActionMap can be shared.

Params:
  • c – JComponent to install the ActionMap on.
  • loaderClass – Class object that gets loadActionMap invoked on.
  • defaultsKey – Key to use to defaults table to check for existing map and what resulting Map will be registered on.
/** * Installs an ActionMap that will be populated by invoking the * <code>loadActionMap</code> method on the specified Class * when necessary. * <p> * This should be used if the ActionMap can be shared. * * @param c JComponent to install the ActionMap on. * @param loaderClass Class object that gets loadActionMap invoked * on. * @param defaultsKey Key to use to defaults table to check for * existing map and what resulting Map will be registered on. */
static void installLazyActionMap(JComponent c, Class loaderClass, String defaultsKey) { ActionMap map = (ActionMap)UIManager.get(defaultsKey); if (map == null) { map = new LazyActionMap(loaderClass); UIManager.getLookAndFeelDefaults().put(defaultsKey, map); } SwingUtilities.replaceUIActionMap(c, map); }
Returns an ActionMap that will be populated by invoking the loadActionMap method on the specified Class when necessary.

This should be used if the ActionMap can be shared.

Params:
  • c – JComponent to install the ActionMap on.
  • loaderClass – Class object that gets loadActionMap invoked on.
  • defaultsKey – Key to use to defaults table to check for existing map and what resulting Map will be registered on.
/** * Returns an ActionMap that will be populated by invoking the * <code>loadActionMap</code> method on the specified Class * when necessary. * <p> * This should be used if the ActionMap can be shared. * * @param c JComponent to install the ActionMap on. * @param loaderClass Class object that gets loadActionMap invoked * on. * @param defaultsKey Key to use to defaults table to check for * existing map and what resulting Map will be registered on. */
static ActionMap getActionMap(Class loaderClass, String defaultsKey) { ActionMap map = (ActionMap)UIManager.get(defaultsKey); if (map == null) { map = new LazyActionMap(loaderClass); UIManager.getLookAndFeelDefaults().put(defaultsKey, map); } return map; } private LazyActionMap(Class loader) { _loader = loader; } public void put(Action action) { put(action.getValue(Action.NAME), action); } public void put(Object key, Action action) { loadIfNecessary(); super.put(key, action); } public Action get(Object key) { loadIfNecessary(); return super.get(key); } public void remove(Object key) { loadIfNecessary(); super.remove(key); } public void clear() { loadIfNecessary(); super.clear(); } public Object[] keys() { loadIfNecessary(); return super.keys(); } public int size() { loadIfNecessary(); return super.size(); } public Object[] allKeys() { loadIfNecessary(); return super.allKeys(); } public void setParent(ActionMap map) { loadIfNecessary(); super.setParent(map); } private void loadIfNecessary() { if (_loader != null) { Object loader = _loader; _loader = null; Class<?> klass = (Class<?>)loader; try { Method method = klass.getDeclaredMethod("loadActionMap", new Class[] { LazyActionMap.class }); method.invoke(klass, new Object[] { this }); } catch (NoSuchMethodException nsme) { assert false : "LazyActionMap unable to load actions " + klass; } catch (IllegalAccessException iae) { assert false : "LazyActionMap unable to load actions " + iae; } catch (InvocationTargetException ite) { assert false : "LazyActionMap unable to load actions " + ite; } catch (IllegalArgumentException iae) { assert false : "LazyActionMap unable to load actions " + iae; } } } }