RFE: DataTable && colgroup
--------------------------
Key: WICKET-1069
URL: https://issues.apache.org/jira/browse/WICKET-1069
Project: Wicket
Issue Type: Improvement
Components: wicket-extensions
Environment: any
Reporter: Jan Kriesten
Hi!
I want to suggest an enhancement for the DataTable extension.
Right now it's only possible to style columns (width, alignment, color etc.)
via stylesheets. This has some not so nice implications IMHO:
- You have to extend the IStyledColumn to return the proper CSS class.
- You have to add a bunch of CSS classes to get the proper styles.
- You have redundancy in HTML output - which isn't necessary.
This is actually what <colgroup><col></colgroup> is meant to solve.
My suggestion:
Adding a 'addColGroup( ColGroup cg )'-feature, which actually lets you add x
ColGroups with n Cols on which you can use AttributeModifiers to have your
styles/classes/width-Attributes added.
A quick implementation would be this:
---[ColGroup.java]--
import java.util.List;
import org.apache.wicket.behavior.IBehavior;
import
org.apache.wicket.extensions.markup.html.repeater.data.table.AbstractToolbar;
import org.apache.wicket.extensions.markup.html.repeater.data.table.DataTable;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.repeater.RepeatingView;
public class ColGroup
extends AbstractToolbar
{
private static final long serialVersionUID = 1L;
private int numCols;
private Col[] cols;
public ColGroup( DataTable datatable, int numCols )
{
super( datatable );
this.numCols = numCols;
}
public void onBeforeRender()
{
if( !hasBeenRendered() )
{
WebMarkupContainer colgroup = new WebMarkupContainer( "colgroup" );
for( IBehavior b : (List<IBehavior>) getBehaviors() )
colgroup.add( b );
setRenderBodyOnly( true );
removeAll();
add( colgroup );
RepeatingView colgroupCols = new RepeatingView( "elements" );
colgroup.add( colgroupCols );
for( Col column : getCols() )
{
WebMarkupContainer item = new WebMarkupContainer(
colgroupCols.newChildId() );
colgroupCols.add( item );
item.add( column );
}
}
super.onBeforeRender();
}
public final Col[] getCols( )
{
if( cols == null )
{
cols = new Col[numCols];
for( int i = 0; i < numCols; i++ )
cols[i] = new Col();
}
return(cols);
}
public final class Col
extends WebMarkupContainer
{
private static final long serialVersionUID = 1L;
private Col()
{
super( "col" );
}
}
}
---[/ColGroup.java]--
---[ColGroup.html]--
<wicket:panel>
<colgroup wicket:id="colgroup">
<wicket:container wicket:id="elements"><col
wicket:id="col"/></wicket:container>
</colgroup>
</wicket:panel>
---[/ColGroup.html]--
Usage:
ColGroup colgroup = new ColGroup( datatable, 4 );
colgroup.add( new SimpleAttributeModifier( "style", "border: solid 1px green;"
) );
Col[] cols = colgroup.getCols();
cols[0].add( new SimpleAttributeModifier( "width", "10%" ) );
cols[1].add( new SimpleAttributeModifier( "width", "35%" ) );
cols[2].add( new SimpleAttributeModifier( "width", "45%" ) );
cols[3].add( new SimpleAttributeModifier( "width", "10%" ) );
datatable.addColGroup( colgroup );
Any thoughts?
Regards, --- Jan.
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