Wrapping a grid

[Andreas Pardeike <ap...@fsys.se>]

Hi,

I want to wrap a grid by putting it into a custom component. But I can't
get parameter blocks to work:

In my page I have:

<t:table.Table t:source="data" name="artiklar">
	<t:parameter name="firstnamecell">!</t:parameter>
</t:table.Table>

and in Table.tml:

<t:container xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd 
">
	<t:grid source="source" row="column">
		<t:body />
	</t:grid>
</t:container>

If I replace <t:body /> with <t:parameter name="firstnamecell">!</ 
t:parameter>
it works fine, but not via the body tag. Is this a limitation, and if  
so, how
do I create a workaround?

Thnx,
Andreas Pardeike

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Re: Wrapping a grid

[MohammadS <sa...@gmail.com>]

I just needed to do something similar. Basically needed to normalize the
paginated (via database) output of a grid with slightly different queries
going into the db pagination call. 

I know you asked this question a long long long time ago, but thought it'll
be here for the next guys looking for a solution.

The grid component takes an "override" parameter which is supplied via
coercion. The key is to provide a different object that will provide the
grid component with the right set of "paramter" blocks.

There are a few steps. 

1. Create a ContainerPropertyOverrides object that contains both the current
container's "ComponentResources" and the grid component's
"ComponentResources"


Here is a sample of the internals

    private final ComponentResources parent;
    private final ComponentResources self;
    
    private final Messages messages;
    
    public ContainerPropertyOverrides(ComponentResources resources)
    {
        Component container = resources.getContainer();
        if(container != null)
            parent = container.getComponentResources();
        else
            parent = null;
        
        self = resources;
        
        messages = resources.getContainerMessages();
        
    }
    
    @Override
    public Block getOverrideBlock(String name)
    {
        if(parent != null)
        {
            Block b = parent.getBlockParameter(name);
            if(b != null)
                return b;
        }
        
        return self.getBlockParameter(name);
    }

2. contribute a coercion from "ComponentResources" to your newly created
object in step 1

here is what i have

public static void contributeTypeCoercer(Configuration<CoercionTuple>
configuration)
    {
        configuration.add(CoercionTuple.create(ComponentResources.class,
ContainerPropertyOverrides.class,
                new Coercion<ComponentResources,
ContainerPropertyOverrides>()
                {
                    public ContainerPropertyOverrides
coerce(ComponentResources input)
                    {
                        return new ContainerPropertyOverrides(input);
                    }
                }));
    }

3. Setup your component to use all this properly

here is a snippet from my setup

public class MyGridWrapper
{
    //this is just to make sure refactoring efforts in the future don't
break this
    // functionality
    private static final String GRID_ID="myGrid";

    @Parameter(value=GRID_ID, allowNull=false)
    @Property(write = false)
    private ContainerPropertyOverrides overrides;
    
    @Property
    @Component(id=GRID_ID, parameters={"overrides=overrides"})    
    private Grid myGrid;

    //stuff that sets up the source, etc etc
}

Knowing tapestry, there are probably a few other options you have to solving
the problem. 

Last thing i'll mention is that you can do this without contributing a
coercion. Simply supply a default value for overrides and construct the
object yourself. 

You can read about it here:
http://tapestry.apache.org/tapestry5.2-dev/guide/parameters.html

Good luck
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