Adding links to a row in a column on click (CellTable) - gwt

Question

I have a CellTable where I want to add several links to a row when I click an add button. Right now Im facing the problem that when I click the add button the link will be added to all rows in that column. Somehow it feels like I only can add things to columns.
// shows project column
final MultipleLinkTextCell projectCell = new MultipleLinkTextCell();
final Column<Booking, String> projectColumn = new Column<Booking, String>(
projectCell) {
#Override
public String getValue(Booking project) {
return "";
}
};
getView().getTimeTable().addColumn(projectColumn, "Tasks");
An Example with Buttons
#Override
protected void render(com.google.gwt.cell.client.Cell.Context context,
SafeHtml data, SafeHtmlBuilder sb) {
String string = "";
for (int i = 0; i < value; i++) {
string += "<button type=\"button\" style=\" height:20px; width:22px\">";
}
sb.appendHtmlConstant(string);
if (data != null) {
sb.append(data);
}
}
Im thinking about to use the Anchor widget because I can handle the placemanager from gwtp with it. But still I dont know how to add widgets to a specific row.
//Update:
I did it like this now, it works, but its better to use the revealmanager. The hardcoded link is kinda bad because I always need to change the reference to the link when I change the webserver. I get a string with several values splitted by a commar.
#Override
protected void render(com.google.gwt.cell.client.Cell.Context context,
SafeHtml data, SafeHtmlBuilder sb) {
String stringData = data.asString();
String[] splitResult = stringData.split(",");
for (int i = 0; i < splitResult.length; i++) {
if (!splitResult[i].equals("")) {
sb.appendHtmlConstant("<div><a href=\"http://127.0.0.1:8888/gwtpTimeTracking.html?gwt.codesvr=127.0.0.1:9997#project;projectid="+splitResult[i].substring(0, 7)+"\">"
+ splitResult[i].substring(0, 7) + "</a></div>");
}
}

Answer 1

You can't use any Widgets in CellWidgets.
However you can create your custom cell that mimics it or create an ActionCell and add a VaueUpdater that fires a PlaceRequest Event.
For adding the link to a specific row you have to add a field (i..e List<String> links) to your DTO that is rendered in your CellTable. When you click on the "Add" button you have to modify the field of the specific DTO in your list.
MyDTO obj = // get the specific DTO from the DataProvider
obj.setLinks(LIST OF LINKS);
In the render method of your custom cell you check the field (i..e links) and either render out the links or not.
Where does the value data in your render method come from ?