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Posted to users@wicket.apache.org by Ceki Gulcu <ce...@qos.ch> on 2009/10/21 19:57:12 UTC
Idiomatic way to reference shared images?
Hello,
I am trying to defined shared images in a Wicket application.
In my prokect, the image file "help.gif" is located under the
src/main/java/com/foo/ folder of my project. I have created an empty
class called Images.
package com.foo;
public class Images {
}
In the init() method of my web-application, I add help.gif as a shared resource:
public class MyApplication extends WebApplication {
@Override
protected void init() {
...
PackageResource pr = PackageResource.get(Images.class, "help.gif");
sharedResources.add("help.gif", pr);
}
}
In markup, I attempt to access the images as
<wicket:link>
<td><img src="/resources/help.gif" align="top"/></td>
</wicket:link>
Unfortunately, this does not seem to work. However, the following
markup works just fine but it's too cumbersome to write.
<wicket:link>
<img src="resources/org.apache.wicket.Application/help.gif"/>
</wicket:link>
Reading page 229 of the Wicket in Action book, I would have thought
that the "/resources/help.gif" reference would have worked. Quoting
from the book:
The resource is then available through a stable URL (/resources/discounts),
independent of components. (page 229)
What is the idiomatic way in Wicket to reference shared images?
Many thanks in advance for your response,
--
Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch
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Re: Idiomatic way to reference shared images?
Posted by John Krasnay <jo...@krasnay.ca>.
On Thu, Oct 22, 2009 at 09:15:35AM +0200, Ceki Gulcu wrote:
> Hi John,
>
> Thank you for your answer. I was already aware of the idiomatic way for
> referencing packaged resources. It is a nice way for bundling images
> which are used within a package. My question was about images shared
> among multiple packages.
Not sure what you mean. The Image/ResourceReference solution works fine across
packages and even across modules, e.g. your images could be part of a shared
library and used by a component in your application.
> Of course the interesting part is that the "help.gif" file is located as
> a resource of my web-app and *not* part of WEB-INF/lib or
> WEB-INF/classes.
Ah, I see, you want to put it there. Is there a technical reason for this or is
it just a preference? Seems to me to be a lot less flexible than simply letting
your images live on the classpath, since you lose the ability to later package
the images in a shared JAR.
jk
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Re: Idiomatic way to reference shared images?
Posted by Ceki Gulcu <ce...@qos.ch>.
Hi John,
Thank you for your answer. I was already aware of the idiomatic way for
referencing packaged resources. It is a nice way for bundling images which are
used within a package. My question was about images shared among multiple packages.
Igor VaynBerg suggested adding a ContextImage which is what I was looking for.
Another person (alankila) suggested images defined by ContextRelativeResource.
Here is sample code:
public class MyPage extends WebPage {
public Contact() {
ContextImage ci = new ContextImage("helpImage", "images/help.gif");
add(ci);
}
}
Associated markup:
<img wicket:id="helpImage" src=""/>
Of course the interesting part is that the "help.gif" file is located as a
resource of my web-app and *not* part of WEB-INF/lib or WEB-INF/classes.
HTH,
John Krasnay wrote:
> On Wed, Oct 21, 2009 at 07:57:12PM +0200, Ceki Gulcu wrote:
>> Hello,
>>
>> I am trying to defined shared images in a Wicket application.
>>
>> In my prokect, the image file "help.gif" is located under the
>> src/main/java/com/foo/ folder of my project. I have created an empty
>> class called Images.
>>
>> package com.foo;
>> public class Images {
>> }
>>
>> In the init() method of my web-application, I add help.gif as a shared resource:
>>
>> public class MyApplication extends WebApplication {
>>
>>
>> @Override
>> protected void init() {
>> ...
>> PackageResource pr = PackageResource.get(Images.class, "help.gif");
>> sharedResources.add("help.gif", pr);
>> }
>> }
>>
>
> I normally don't need to do anything in my app's init() method for images.
>
>> In markup, I attempt to access the images as
>>
>> <wicket:link>
>> <td><img src="/resources/help.gif" align="top"/></td>
>> </wicket:link>
>>
>
> You would use <wicket:link> when the image is in the same package as the
> markup. In this case, you would just put in <img src="help.gif"> and Wicket
> will re-write the src attribute to the right value. This works well if you like
> to preview your markup in a browser.
>
> Since your images are (I think) in a different package, you should get rid of
> the <wicket:link> tag.
>
> (Actually, I think using a relative path to the right package in src might
> work with <wicket:link>, but I never do it that way. See below.)
>
>> Unfortunately, this does not seem to work. However, the following
>> markup works just fine but it's too cumbersome to write.
>>
>> <wicket:link>
>> <img src="resources/org.apache.wicket.Application/help.gif"/>
>> </wicket:link>
>>
>> Reading page 229 of the Wicket in Action book, I would have thought
>> that the "/resources/help.gif" reference would have worked. Quoting
>> from the book:
>>
>> The resource is then available through a stable URL (/resources/discounts),
>> independent of components. (page 229)
>>
>> What is the idiomatic way in Wicket to reference shared images?
>>
>
> Here's my idiom. First, in the same package as my images, I create a class that
> extends ResourceReference:
>
> public class MyImage extends ResourceReference {
> public MyImage(String name) {
> super(MyImage.class, name);
> }
> }
>
> Then, I attach an Image component to the <img> tag:
>
> <img wicket:id="smiley"/>
>
> add(new Image("smiley", new MyImage("smiley.gif")));
>
> No code needed in Application.init(), and no <wicket:link> tags required.
>
> jk
--
Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch
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Re: Idiomatic way to reference shared images?
Posted by John Krasnay <jo...@krasnay.ca>.
On Wed, Oct 21, 2009 at 07:57:12PM +0200, Ceki Gulcu wrote:
> Hello,
>
> I am trying to defined shared images in a Wicket application.
>
> In my prokect, the image file "help.gif" is located under the
> src/main/java/com/foo/ folder of my project. I have created an empty
> class called Images.
>
> package com.foo;
> public class Images {
> }
>
> In the init() method of my web-application, I add help.gif as a shared resource:
>
> public class MyApplication extends WebApplication {
>
>
> @Override
> protected void init() {
> ...
> PackageResource pr = PackageResource.get(Images.class, "help.gif");
> sharedResources.add("help.gif", pr);
> }
> }
>
I normally don't need to do anything in my app's init() method for images.
> In markup, I attempt to access the images as
>
> <wicket:link>
> <td><img src="/resources/help.gif" align="top"/></td>
> </wicket:link>
>
You would use <wicket:link> when the image is in the same package as the
markup. In this case, you would just put in <img src="help.gif"> and Wicket
will re-write the src attribute to the right value. This works well if you like
to preview your markup in a browser.
Since your images are (I think) in a different package, you should get rid of
the <wicket:link> tag.
(Actually, I think using a relative path to the right package in src might
work with <wicket:link>, but I never do it that way. See below.)
> Unfortunately, this does not seem to work. However, the following
> markup works just fine but it's too cumbersome to write.
>
> <wicket:link>
> <img src="resources/org.apache.wicket.Application/help.gif"/>
> </wicket:link>
>
> Reading page 229 of the Wicket in Action book, I would have thought
> that the "/resources/help.gif" reference would have worked. Quoting
> from the book:
>
> The resource is then available through a stable URL (/resources/discounts),
> independent of components. (page 229)
>
> What is the idiomatic way in Wicket to reference shared images?
>
Here's my idiom. First, in the same package as my images, I create a class that
extends ResourceReference:
public class MyImage extends ResourceReference {
public MyImage(String name) {
super(MyImage.class, name);
}
}
Then, I attach an Image component to the <img> tag:
<img wicket:id="smiley"/>
add(new Image("smiley", new MyImage("smiley.gif")));
No code needed in Application.init(), and no <wicket:link> tags required.
jk
> Many thanks in advance for your response,
>
> --
> Ceki Gülcü
> Logback: The reliable, generic, fast and flexible logging framework for Java.
> http://logback.qos.ch
>
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> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
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