gwt celltable: Possible to only make some cells in a column editable?

Question

I'm using GWT 2.4. When using a CellTable, I've seen its possible to add a column in which all of the cells are editable ...

final TextInputCell nameCell = new TextInputCell();
Column<Contact, String> nameColumn = new Column<Contact, String>(nameCell) {
  @Override
  public String getValue(Contact object) {
    return object.name;
  }
};
table.addColumn(nameColumn, "Name");

but what if I don't want every cell in the column to be editable, only specific ones, based on properties in my "Contact" object? How would I set this up? Thanks, - Dave

Answer 1

The way I would do it is extend the TextInputCell and override the render method to render something else, if you don't want the value in that particular row editable.

Something like this:

public class MyTextInputCell extends TextInputCell {
  @Override
  public void render(Context context, String value, SafeHtmlBuilder sb) {
     YourObject object = getYourObject();
     if ( object.isThisCellEditable() ) {
        super.render(context,value,sb);
     } else {
        sb.appendEscaped(value); // our some other HTML. Whatever you want.
     }
  }
}

In the render method you have access to the cell's context. Context.getIndex() returns the absolute index of the object. I can't remember of the top of my wad right now, but if you do not provide a ProvidesKey implementation when creating your CellTable you will get one that will use the object itself as the key. So you can get the object using Context.getKey().