[icedtea-web] RFC: Use a simple gui dialog to indicate errors in launching applications

[Omair Majid]

Hi,

The attached patch adds a new GuiLaunchHandler class which uses gui 
elements to display exceptions that occur when launching JNLP 
applications. This is only used if not running in headless mode. 
Something different will be needed for the plugin.

Not all exceptions are caught by this - some parsing exceptions can 
occur in Boot. I will be posting fixes for those later.

I have also moved the splash screen stuff into this class as it makes no 
sense to have it run in headless mode.

Any thoughts or comments?

ChangeLog:

2011-03-29  Omair Majid  <omajid at redhat.com>

     * netx/net/sourceforge/jnlp/LaunchHandler.java
     (launchInitialized, launchStarting): New methods.
     * netx/net/sourceforge/jnlp/DefaultLaunchHandler.java
     (launchInitialized, launchStarting): New methods. No-op
     implementation.
     * netx/net/sourceforge/jnlp/GuiLaunchHandler.java: New file.
     (launchCompleted, launchError, launchStarting, launchInitialized),
     (launchWarning, validationError): New methods.
     * netx/net/sourceforge/jnlp/Launcher.java (launchApplication):
     Invoke handler.launchInitialized and handler.launchStarting instead
     of showing a splash screen directly.
     * netx/net/sourceforge/jnlp/resources/Messages.properties: Add
     ButShowDetails, ButHideDetails and Error.
     * netx/net/sourceforge/jnlp/runtime/Boot.java (run): Do not exit on
     error.
     * netx/net/sourceforge/jnlp/runtime/JNLPRuntime.java
     (initialize): Set handler to GuiLaunchHandler if not running in
     headless mode.
     * netx/net/sourceforge/jnlp/util/BasicExceptionDialog.java: New
     file.
     (exceptionToString, show): New methods.

Cheers,
Omair
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