Listing the Actions in a Component
This example demonstrates how to list all the actions
in a component.
A text component not only has an action map with actions, it also has
keymaps with actions. Moreover, every keymap has a default action to
handle any typed character key events not handled by any input map or
keymap. The following code retrieves actions from these objects:
ActionMap map = component.getActionMap();
// List actions in the component
list(map, map.keys());
// List actions in the component and in all parent action maps
list(map, map.allKeys());
public static void list(ActionMap map, Object[] actionKeys) {
if (actionKeys == null) {
return;
}
for (int i=0; i<actionKeys.length; i++) {
// Get the action bound to this action key
while (map.get(actionKeys[i]) == null) {
map = map.getParent();
}
Action action = (Action)map.get(actionKeys[i]);
}
}
// List the actions in the keymaps
if (component instanceof JTextComponent) {
JTextComponent textComp = (JTextComponent)component;
Keymap keymap = textComp.getKeymap();
while (keymap != null) {
// Get actions in the keymap
Action[] actions = keymap.getBoundActions();
for (int i=0; i<actions.length; i++) {
Action action = actions[i];
}
// Get the default action in the keymap
Action defaultAction = keymap.getDefaultAction();
keymap = keymap.getResolveParent();
}
}
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