Re: [rap-dev] Support Internet Explorer < 9 without VML

[frank.jakop@xxxxxxxxx]

Hi Tim,

yersterday we tried this one by removing
all gradients, animations, rounded corners, but then the events were no
longer propagated, so we could see some sort of button (very ugly though)
but were not able to click them.
As we understood the code in [1] when
the engine says that VML is supported, a renderClass of VML-type would
always be instantiated which in our opinion leads to _javascript_ errors
that kill something in the application. But we're no _javascript_ experts
(that's why we use RAP).

Would it be possible in your opinion,
when we use IE 8 without enabled vgx.dll but with installed VMLViewer-Plugin?
Maybe the service provider of our customers could implement this, assuming
there's no known security issue.

Greetings,
Frank

Von:	Tim Buschtöns <tbuschto@xxxxxxxxxxxxxxxxx>
An:	RAP project development-related communication <rap-dev@xxxxxxxxxxx>
Datum:	09.05.2014 12:22
Betreff:	Re: [rap-dev] Support Internet Explorer < 9 without VML
Gesendet von:	rap-dev-bounces@xxxxxxxxxxx

---

Hi.

It should be possible to modify any RAP version to work without VML, assuming
the "classic" theme is used (as it doesn't use gradients/rounded
borders) and no Canvas widgets are used.
The ProgressBar widget is also problematic, but could be modified to work
without VML.
However, these changes aren't trivial and I can not give you some easy-to-follow
tutorial to implement them. I would have to do it myself and probably need
at least few days for that.

Greetings,
Tim

Am 09.05.2014 08:24, schrieb frank.jakop@xxxxxxxxx:
Hello, 

we are using RAP 1.5.2 for about 7 applications among 400 customers. Most
of them still stick to Windows XP and therefore to IE 8 (because our customers
are mostly bank institutes who depend on external IT service provider).

Recently a security vulnerability in the Microsoft VML-Library came up
which was fixed by an out-of-band patch (http://support.microsoft.com/kb/2964358
relating to https://technet.microsoft.com/de-de/library/security/ms14-021).

Instead of using this patch the service provider of our customers suggested
disabling the VML-capabilities of IE by unregistering the dll "%CommonProgramFiles%\Microsoft
Shared\VGX\vgx.dll". This makes every RAP-application non-functional
on IE < 9, because it tries to initialize an org.eclipse.rwt.VML in
org.eclipse.rwt.GraphicsUtil, if the engine reports to support VML [1].

As far as we can see, IE up to version 8 reports as engine name "mshtml",
which in org.eclipse.rwt.Client leads to returning true in function supportsVml.
[2] 

So the question is: Is it possible to get around this with
 a) not having the customers upgrade to IE >= 9
 b) not having the customers use a different browser
 c) not having the customers to re-enable the vgx.dll
? 

Best regards 

Frank Jakop
Teamleiter
________________________

arxes-tolina GmbH
Salzufer 8, 10587 Berlin
http://www.arxes-tolina.de

[1] 
statics : { 
    _renderClass : null,
    
    init : function()
{ 
      if(
this._renderClass
== null
) { 
        if(
org.eclipse.rwt.Client.supportsVml() ) { 
          this._renderClass
= org.eclipse.rwt.VML; 
        } else
if
( org.eclipse.rwt.Client.supportsSvg() ) { 
          this._renderClass
= org.eclipse.rwt.SVG; 
        } 
        if(
this._renderClass
!= null
) { 
          this._renderClass.init();
        } 
      } 
    }, 


[2] 
supportsVml : function() { 
      return ( this.getEngine() === "mshtml" )
&& ( this.getVersion() >= 5.5 ); 
}, 

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