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    <p>My assumption - <em>nothing special required to do, JOptionPane just does it</em> - was based on skimming BasicOptionPaneUI code and checking if the optionPane's audioActionMap is installed. </p> <p>The place where the audio is played is in the ui's propertyChangeListener on a change to its ancestor property:</p> <pre><code>if ("ancestor" == e.getPropertyName()) { JOptionPane op = (JOptionPane)e.getSource(); boolean isComingUp; // if the old value is null, then the JOptionPane is being // created since it didn't previously have an ancestor. if (e.getOldValue() == null) { isComingUp = true; } else { isComingUp = false; } // figure out what to do based on the message type switch (op.getMessageType()) { case JOptionPane.PLAIN_MESSAGE: if (isComingUp) { BasicLookAndFeel.playSound(optionPane, "OptionPane.informationSound"); } break; // all other message types handled as well } </code></pre> <p>the shared actionMap is installed (lazyly, so an optionPane must have been visible once)</p> <pre><code>assertTrue(UIManager.get("AuditoryCues.actionMap") instanceof ActionMap); ActionMap map = (ActionMap) UIManager.get("AuditoryCues.actionMap"); assertNotNull(map.get("OptionPane.errorSound")); </code></pre> <p>sounds enabled on OS (win 7) level and sound on hardware turned on (just for testing) ... WTF: but nothing happens (and assumption proven to be wrong ;-)</p> <p>Debug session (I hate it ... but occasionally ...) turns out that performing the audioAction doesn't happen, here are the methods involved : </p> <pre><code>static void playSound(JComponent c, Object actionKey) { LookAndFeel laf = UIManager.getLookAndFeel(); if (laf instanceof BasicLookAndFeel) { ActionMap map = c.getActionMap(); if (map != null) { Action audioAction = map.get(actionKey); if (audioAction != null) { // pass off firing the Action to a utility method // JW: we have an audioAction, so on to the next method ((BasicLookAndFeel)laf).playSound(audioAction); } } } } protected void playSound(Action audioAction) { if (audioAction != null) { Object[] audioStrings = (Object[]) UIManager.get("AuditoryCues.playList"); if (audioStrings != null) { // JW: here the action is performed ... except we don't reach this .... } } </code></pre> <p>That's rather astonishing, isn't it? After all, the action were created, so if there is no playlist, why would they have been created?</p> <p>And here comes the catch: the list used for creating the actions is a different list</p> <pre><code>// in BasicLookAndFeel protected ActionMap getAudioActionMap() { ActionMap audioActionMap = (ActionMap)UIManager.get( "AuditoryCues.actionMap"); if (audioActionMap == null) { // here it's named cueList Object[] acList = (Object[])UIManager.get("AuditoryCues.cueList"); } </code></pre> <p>and the reason that's a different list is ... to allow LAFs to customize the sounds that actually are to be played</p> <pre><code>// BasicLookAndFeel // *** Auditory Feedback "AuditoryCues.cueList", allAuditoryCues, // this key defines which of the various cues to render. // L&amp;Fs that want auditory feedback NEED to override playList. "AuditoryCues.playList", null, </code></pre> <p>Ooookaaayy .. so let's see what a concrete LAF is doing, f.i. Win:</p> <pre><code>// *** Auditory Feedback // this key defines which of the various cues to render // Overridden from BasicL&amp;F. This L&amp;F should play all sounds // all the time. The infrastructure decides what to play. // This is disabled until sound bugs can be resolved. "AuditoryCues.playList", null, // table.get("AuditoryCues.cueList"), </code></pre> <p>EOL.</p> <p>Not quite :-) This comment hints to what is doable:</p> <pre><code>Object[] cueList = (Object[]) UIManager.get("AuditoryCues.cueList"); UIManager.put("AuditoryCues.playList", cueList); </code></pre> <p>Which in fact does work for WindowsLAF (even respecting the OS sound schema and - most importantly - <em>not</em> playing if disabled), but not for any of the other core LAFs. </p>
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