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;; Copyright (c) Stephen C. Gilardi. All rights reserved. The use and
;; distribution terms for this software are covered by the Eclipse Public
;; License 1.0 ( which can
;; be found in the file epl-v10.html at the root of this distribution. By
;; using this software in any fashion, you are agreeing to be bound by the
;; terms of this license. You must not remove this notice, or any other,
;; from this software.
;; clojure.contrib.swing-utils
;; Useful functions for interfacing Clojure to Swing
;; scgilardi (gmail)
;; Created 31 May 2009
(ns clojure.contrib.swing-utils
(:import (java.awt.event ActionListener KeyAdapter)
(javax.swing AbstractAction Action
JMenu JMenuBar JMenuItem
(:use [clojure.contrib.def :only (defvar)]))
(defn add-action-listener
"Adds an ActionLister to component. When the action fires, f will be
invoked with the event as its first argument followed by args.
Returns the listener."
[component f & args]
(let [listener (proxy [ActionListener] []
(actionPerformed [event] (apply f event args)))]
(.addActionListener component listener)
(defn add-key-typed-listener
"Adds a KeyListener to component that only responds to KeyTyped events.
When a key is typed, f is invoked with the KeyEvent as its first argument
followed by args. Returns the listener."
[component f & args]
(let [listener (proxy [KeyAdapter] []
(keyTyped [event] (apply f event args)))]
(.addKeyListener component listener)
;; ----------------------------------------------------------------------
;; Meikel Brandmeyer
(defn do-swing*
"Runs thunk in the Swing event thread according to schedule:
- :later => schedule the execution and return immediately
- :now => wait until the execution completes."
[schedule thunk]
(= schedule :later) (SwingUtilities/invokeLater thunk)
(= schedule :now) (if (SwingUtilities/isEventDispatchThread)
(SwingUtilities/invokeAndWait thunk)))
(defmacro do-swing
"Executes body in the Swing event thread asynchronously. Returns
immediately after scheduling the execution."
[& body]
`(do-swing* :later (fn [] ~@body)))
(defmacro do-swing-and-wait
"Executes body in the Swing event thread synchronously. Returns
after the execution is complete."
[& body]
`(do-swing* :now (fn [] ~@body)))
(defvar action-translation-table
(atom {:name Action/NAME
:accelerator Action/ACCELERATOR_KEY
:command-key Action/ACTION_COMMAND_KEY
:long-desc Action/LONG_DESCRIPTION
:short-desc Action/SHORT_DESCRIPTION
:mnemonic Action/MNEMONIC_KEY
:icon Action/SMALL_ICON})
"Translation table for the make-action constructor.")
(defn make-action
"Create an Action proxy from the given action spec. The standard keys
recognised are: :name, :accelerator, :command-key, :long-desc,
:short-desc, :mnemonic and :icon - corresponding to the similar named
Action properties. The :handler value is used in the actionPerformed
method of the proxy to pass on the event."
(let [t-table @action-translation-table
handler (:handler spec)
spec (dissoc spec :handler)
spec (map (fn [[k v]] [(t-table k) v]) spec)
action (proxy [AbstractAction] []
(actionPerformed [evt] (handler evt)))]
(doseq [[k v] spec]
(.putValue action k v))
(defvar menu-constructor-dispatch
(atom #{:action :handler :items})
"An atom containing the dispatch set for the add-menu-item method.")
(defmulti add-menu-item
"Adds a menu item to the parent according to the item description.
The item description is a map of the following structure.
- one single :action specifying a javax.swing.Action to be associated
with the item.
- a specification suitable for make-action
- a set of :name, :mnemonic and :items keys, specifying a submenu with
the given sequence of item entries.
- an empty map specifying a separator."
{:arglists '([parent item])}
(fn add-menu-item-dispatch [_ item]
(some @menu-constructor-dispatch (keys item))))
(defmethod add-menu-item :action
[parent {:keys [action]}]
(let [item (JMenuItem. action)]
(.add parent item)))
(defmethod add-menu-item :handler
[parent spec]
(add-menu-item parent {:action (make-action spec)}))
(defmethod add-menu-item :items
[parent {:keys [items mnemonic name]}]
(let [menu (JMenu. name)]
(when mnemonic
(.setMnemonic menu mnemonic))
(doseq [item items]
(add-menu-item menu item))
(.add parent menu)))
(defmethod add-menu-item nil ; nil meaning separator
[parent _]
(.addSeparator parent))
(defn make-menubar
"Create a menubar containing the given sequence of menu items. The menu
items are described by a map as is detailed in the docstring of the
add-menu-item function."
(let [menubar (JMenuBar.)]
(doseq [item menubar-items]
(add-menu-item menubar item))
;; ----------------------------------------------------------------------
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