Have you looked at the source for existing renderers?
http://svn.apache.org/repos/asf/pivot/trunk/wtk/src/org/apache/pivot/wtk/content/
http://svn.apache.org/repos/asf/pivot/trunk/wtk/src/org/apache/pivot/wtk/content/TableViewCellRenderer.java
http://svn.apache.org/repos/asf/pivot/trunk/wtk/src/org/apache/pivot/wtk/content/ListViewItemRenderer.java
http://svn.apache.org/repos/asf/pivot/trunk/wtk/src/org/apache/pivot/wtk/content/ButtonDataRenderer.java
I think all of them override
org.apache.pivot.wtk.Component.setSize(int, int) as follows. Notice
the comment.
@Override
public void setSize(int width, int height) {
super.setSize(width, height);
// Since this component doesn't have a parent, it won't be validated
// via layout; ensure that it is valid here
validate();
}
Chris
On 19 December 2011 18:42, David Delbecq <[email protected]> wrote:
> Hello, i have a Label used as a tableview cell renderer. However, when using
> it, i get a NullPointerException inside the pivot Terra skin. Is there a
> limitation that Label can't be used as cell renderers?
>
>
> the following is BXML code:
> <TableView bxml:id="nodeACLs" tableDataKey="aces">
> <columns>
> <TableView.Column name="principal" headerData="who"
> width="1*" >
> <cellRenderer>
> <ui:PrincipalCellRenderer/>
> </cellRenderer>
> </TableView.Column>
>
>
> with PrincipalCellRender extending Label
> public class PrincipalCellRenderer extends Label implements
> TableView.CellRenderer{
>
> @Override
> public void render(Object row, int rowIndex, int columnIndex,
> TableView tableView, String columnName, boolean selected,
> boolean highlighted, boolean disabled) {
> if (row !=null){
> DavPrincipal principal = ((DavAce)row).getPrincipal();
> System.out.println("Setting row to"+principal.getValue());
> setText(principal.getValue());
>
> } else
> setText("");
>
> }
>
> @Override
> public String toString(Object row, String columnName) {
> if (row !=null){
> DavPrincipal principal = ((DavAce)row).getPrincipal();
> return principal.getValue();
>
> }
> return "";
> }
>
>
> Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
> at org.apache.pivot.wtk.skin.LabelSkin.paint(LabelSkin.java:295)
> at org.apache.pivot.wtk.Component.paint(Component.java:2060)
> at
> org.apache.pivot.wtk.skin.terra.TerraTableViewSkin.paint(TerraTableViewSkin.java:446)
> at org.apache.pivot.wtk.Component.paint(Component.java:2060)
> at org.apache.pivot.wtk.Container.paint(Container.java:410)
> at org.apache.pivot.wtk.Container.paint(Container.java:410)
>
> Eclipse point me to the following line of LabelSkin for exception
> if (glyphVectors.getLength() > 0) {
>
>
>
> I solved this by calling manually layout() during render(), but that seems
> curious.
>
> David Delbecq
>
