How to pass a Parameterized Command to a CommandContributionItem - swt

Question

Using Eclipse and SWT I am currently trying to get a CommandContributionItem (CCI) as a Button into a ViewPart with two text fields. When I push the button my ParameterizedCommand should be called using the current text values of the text fields as parameters.
I was able to pass the initial values of the text fields to the CCI like that:
public void createPartControl(Composite parent) {
parent.setLayout(new GridLayout(1, false));
text = new Text(parent, SWT.BORDER);
text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
text_1 = new Text(parent, SWT.BORDER);
text_1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
Map<String, String> params = new HashMap<String, String>();
params.put("myString", text.getText());
params.put("mySecondString", text_1.getText());
CommandContributionItemParameter p = new CommandContributionItemParameter(getSite(),
"commandSyso","com.voo.example.commandparameter.simple.sysoCommand", CommandContributionItem.STYLE_PUSH);
p.label = "My Label";
p.parameters = params;
CommandContributionItem item = new CommandContributionItem(p);
item.fill(parent);
}
But it is a static one-time pass. Is there a way to update this dynamically every time the CCI is called?

Answer 1

CommandContributionItem parameters are static in nature. You can't modify them, only create a new instance of CommandContributionItem.
When working with commands, implementation of IHandler should look for the current selection using the ExecutionEvent.getApplicationContext(). If it is an IEvaluationContext, the selection can be retrieved using org.eclipse.ui.handlers.HandlerUtil
But in your example, you would need some way to supply the values of your 2 text fields to the framework, either by implementing an ISelectionProvider, an ISourceProvider (where you could provide each text field under a new name), or by having your handler check for your IViewPart and then access the information through accessors.