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Posted to users@wicket.apache.org by Dirk Forchel <di...@exedio.com> on 2013/11/07 09:15:51 UTC
Struggling with ContextRelativeResource,
RenderedDynamicImageResource and SharedResources
I mount two different resources almost the same way to figure out how it
works. First of all a context relative resource (the dotclear_tmp.png image
is relative to the context root in my WEB-INF container) and second a
dynamically created image resource (see below). But in my panel the src
attributes of the img-tags are not referenced correctly or at least it does
not works the way I would expect.
I've noticed that I do not have to register the dotclear_tmp.png image the
way I did, because the image is delivered with my web container and can be
resolved by Wicket automatically. Even if I would remove the
SharedResourceReference, the image could be found.
I have to explain, that my WebApplication is mapped to the /foo servlet
path. And I can request the images with the following URLs:
localhost:8080/images/dotclear_tmp.png (the image relative to the context
root in my web container)
localhost:8080/foo/images/dotclear_tmp.png (the mounted image as shared
resource)
localhost:8080/foo/images/dotclear.png (the mounted image as dynamic
resource)
Below my Panel for tests. The first image is shown (I guess this is the
image from the web container). The second image is not shown (the relative
URL does not point to the mounted one) where
the third and fourth src attributes are working. But I guess this is not the
way it should or at least it is not a good idea to include the servlet
context path to the src attribute of the img-tags.
I need an explanation how it could work as expected and how to solve my
problem.
The request to my home page with the following URL
http://localhost:8080/foo/uk/en/home.html
would render the page with the following relative URLs for the -tag:
In my Application:
ContextRelativeResource resource = new
ContextRelativeResource("/images/dotclear_tmp.png");
// NOTE: an AutoResourceReference is created
getSharedResources().add( "dotclear", resource );
// NOTE: SharedResourceReference is just a shortcut to the previous created
AutoResourceReference
mountResource("/images/dotclear_tmp.png", new
SharedResourceReference("dotclear") );
// NOTE: create on the fly an image resource as placeholder
mountResource("/images/dotclear.png", new
PlaceholderImageResourceReference() );
public class PlaceholderImageResourceReference extends ResourceReference
{
private static final long serialVersionUID = 1L;
public PlaceholderImageResourceReference()
{
super("placeholderImageResource");
}
@Override
public IResource getResource()
{
return new PlaceholderImageResource();
}
/**
* A cached resource which returns back a placeholder image as bytes.
*/
private static class PlaceholderImageResource extends
RenderedDynamicImageResource
{
private static final long serialVersionUID = 1L;
public PlaceholderImageResource()
{
super( 1, 1, "png" );
setType( BufferedImage.TYPE_INT_ARGB );
}
@Override
protected boolean render( Graphics2D graphics, Attributes attributes )
{
graphics.setComposite( AlphaComposite.getInstance(AlphaComposite.CLEAR,
0));
graphics.fillRect(0, 0, getWidth(), getHeight() );
return true;
}
@Override
public boolean equals(Object that)
{
return that instanceof PlaceholderImageResource;
}
}
}
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Re: Struggling with ContextRelativeResource,
RenderedDynamicImageResource and SharedResources
Posted by Dirk Forchel <di...@exedio.com>.
Thank you Martin. Lovely.
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Re: Struggling with ContextRelativeResource, RenderedDynamicImageResource
and SharedResources
Posted by Martin Grigorov <mg...@apache.org>.
Hi,
With the following modifications it works:
in HomePage.html:
<span>static resource from Web Container</span>
<img class="icon" src="images/dotclear.png" /><br>
<span>ContextRelativeResource with SharedResourceReference</span>
<img class="icon" wicket:id="dotclear1" /><br>
<span>PlaceholderImageResourceReference</span>
<img class="icon" wicket:id="dotclear2" />
in HomePage.java:
add(new Image("dotclear1", new SharedResourceReference("dotclear")));
add(new Image("dotclear2", new PlaceholderImageResourceReference()));
the generated paths look like:
http://localhost:8080/en_US/images/dotclear1-ver-1383895720000.png
note the locale as first segment in the path! with your code this is
missing and thus the 404s
Martin Grigorov
Wicket Training and Consulting
https://twitter.com/mtgrigorov
On Wed, Aug 20, 2014 at 10:58 AM, Dirk Forchel <di...@exedio.com>
wrote:
> Hi Ernesto,
> after a couple of weeks (months) I still haven't found a solution. Any
> idea?
> Thanks for your helping hand.
>
>
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Re: Struggling with ContextRelativeResource,
RenderedDynamicImageResource and SharedResources
Posted by Dirk Forchel <di...@exedio.com>.
Hi Ernesto,
after a couple of weeks (months) I still haven't found a solution. Any idea?
Thanks for your helping hand.
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Re: Struggling with ContextRelativeResource, RenderedDynamicImageResource
and SharedResources
Posted by Ernesto Reinaldo Barreiro <re...@gmail.com>.
Did not have time to look at it. I will try today.
On Tue, Nov 12, 2013 at 7:44 AM, Dirk Forchel <di...@exedio.com>wrote:
> Did anybody try to run my attached quickstart application and can explain
> why
> the additional LocaleMapper changes the path?
>
>
>
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Re: Struggling with ContextRelativeResource,
RenderedDynamicImageResource and SharedResources
Posted by Dirk Forchel <di...@exedio.com>.
Did anybody try to run my attached quickstart application and can explain why
the additional LocaleMapper changes the path?
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Re: Struggling with ContextRelativeResource,
RenderedDynamicImageResource and SharedResources
Posted by Dirk Forchel <di...@exedio.com>.
No, actually not. We've got a complete layout for our web applications from
an external design company and they use this CSS+static image resource thing
quite often. And, as I have mentioned before, we have two Wicket web
applications running in the same container. One of them on the root context
and one of them on e.g. "/foo". If I start the application server (Tomcat)
and request the home page of the second application (e.g.
"/foo/uk/en/home.html") the first application is initialized too, just to
render the static placeholder image from the web container. I was wondering
why and started to do some investigation. If I would disable the first web
application (remove the servlet from web.xml), all works fine and even the
static image resource from the web container is delivered.
By the way ... I've finished to prepare a quickstart (see uploaded
quickstart.zip file). At the first glance all images were rendered. I've
added an additional mapper (the LocalMapper from the Wicket examples) to
simulate our Country/Language mapping solution and ... oh wonder ... the
second and third images are not rendered!
quickstart.zip
<http://apache-wicket.1842946.n4.nabble.com/file/n4662232/quickstart.zip>
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Re: Struggling with ContextRelativeResource, RenderedDynamicImageResource
and SharedResources
Posted by Ernesto Reinaldo Barreiro <re...@gmail.com>.
may I ask what is the use case for this 1x1 PNG? Is it something that
cannot be handled via CSS + static image on resources?
On Fri, Nov 8, 2013 at 8:49 AM, Dirk Forchel <di...@exedio.com>wrote:
> Okay. I know, but their is no need for an additional parameter. I want to
> generate always the same image (a 1x1px PNG with a transparent background).
> So I don't see the need for a parameter.
> But I try to prepare a quickstart.
>
>
>
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Regards - Ernesto Reinaldo Barreiro
Re: Struggling with ContextRelativeResource,
RenderedDynamicImageResource and SharedResources
Posted by Dirk Forchel <di...@exedio.com>.
Okay. I know, but their is no need for an additional parameter. I want to
generate always the same image (a 1x1px PNG with a transparent background).
So I don't see the need for a parameter.
But I try to prepare a quickstart.
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Re: Struggling with ContextRelativeResource, RenderedDynamicImageResource
and SharedResources
Posted by Ernesto Reinaldo Barreiro <re...@gmail.com>.
If you mount a global resource then you can pass a parameter to it and use
that parameter to generate dynamic image. If you create a quickstart I
could try to look at it and help (if I can).
On Fri, Nov 8, 2013 at 8:18 AM, Dirk Forchel <di...@exedio.com>wrote:
> Yes, I know this article and based on this one I wrote the
> PlaceholderImageResourceReference class. And it works as expected. I mean I
> can add this resource reference to each component I want.
>
> Panel:
>
> add( new Image("placeholderImg", new PlaceholderImageResourceReference() )
> );
>
> Markup:
>
>
> But this is not the point. I thought I can add a kind of "global" resource
> with a mount path like:
> mountResource("/images/dotclear.png", new
> PlaceholderImageResourceReference() );
>
> Where each src-attribute of an img-tag with the src path like
> "images/dotclear.png" is replaced with the image automatically. But it is
> not. We have about 10 to 20 Panels with almost the same "placeholder"
> image.
>
> But if I add the servlet context path (the application runs with this
> servlet context path) to the src-attribute, the image is added!? I don't
> understand why?
>
> This is a bit strange to me.
>
>
>
>
>
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Regards - Ernesto Reinaldo Barreiro
Re: Struggling with ContextRelativeResource,
RenderedDynamicImageResource and SharedResources
Posted by Dirk Forchel <di...@exedio.com>.
Yes, I know this article and based on this one I wrote the
PlaceholderImageResourceReference class. And it works as expected. I mean I
can add this resource reference to each component I want.
Panel:
add( new Image("placeholderImg", new PlaceholderImageResourceReference() )
);
Markup:
But this is not the point. I thought I can add a kind of "global" resource
with a mount path like:
mountResource("/images/dotclear.png", new
PlaceholderImageResourceReference() );
Where each src-attribute of an img-tag with the src path like
"images/dotclear.png" is replaced with the image automatically. But it is
not. We have about 10 to 20 Panels with almost the same "placeholder" image.
But if I add the servlet context path (the application runs with this
servlet context path) to the src-attribute, the image is added!? I don't
understand why?
This is a bit strange to me.
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Re: Struggling with ContextRelativeResource, RenderedDynamicImageResource
and SharedResources
Posted by Ernesto Reinaldo Barreiro <re...@gmail.com>.
Did you read this?
http://wicketinaction.com/2011/07/wicket-1-5-mounting-resources/
On Fri, Nov 8, 2013 at 6:56 AM, Dirk Forchel <di...@exedio.com>wrote:
> No comment? No idea? Probably another solution?
> Thanks
>
>
>
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Re: Struggling with ContextRelativeResource,
RenderedDynamicImageResource and SharedResources
Posted by Dirk Forchel <di...@exedio.com>.
No comment? No idea? Probably another solution?
Thanks
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Re: Struggling with ContextRelativeResource,
RenderedDynamicImageResource and SharedResources
Posted by Dirk Forchel <di...@exedio.com>.
And finally I've added two Image components to the Panel (this works as
expected).
In my Panel.class:
add( new Image("img1", new SharedResourceReference("dotclear") ) );
add( new Image("img2", new PlaceholderImageResourceReference() ) );
HTML:
Rendered URLs:
In addition we use the placeholder image quite often in different panels to
replace it with different css rules like this (only an example):
.bt_right {
background: url(../images/sprite.png) -200px -30px;
width: 10px;
height:32px;
margin:4px 0 0 0;
}
So even if I could add an appropriate Image component to each panel using
the placeholder image this would blow up the code where it should not. I
hope I could make it clear.
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