Eclipse e4. How I can get selected menu item reference?

Question

I would line to get the reference of selected menu item of the menu. How can I do this?

This is an example of a class which is responsible for execute the marked by @Execute annotation method.

This is a wrong way:

import java.util.Iterator;
import java.util.List;

import javax.inject.Inject;

import org.eclipse.e4.core.di.annotations.CanExecute;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.model.application.MApplication;
import org.eclipse.e4.ui.model.application.ui.MElementContainer;
import org.eclipse.e4.ui.model.application.ui.MUIElement;
import org.eclipse.e4.ui.model.application.ui.basic.MWindow;
import org.eclipse.e4.ui.model.application.ui.menu.MMenu;
import org.eclipse.e4.ui.model.application.ui.menu.MMenuElement;

import com.lwm.app.parts.GuiContainer;

public final class MenuItemSelectionExecution {


    @SuppressWarnings("rawtypes")
    private MElementContainer menu = null;

    @Inject
    private MWindow window;

    @CanExecute
    public boolean canExecute() {

        if (null == menu) {
            setMenu();
        }

        if (null == menu) {
            return false;
        }
        return true;
    }



    @Execute
    public void execute(MApplication app) {


        MWindow selectedElement = app.getSelectedElement();
        System.out.println(selectedElement);

        MUIElement selectedElement2 = menu.getSelectedElement();
        //selectedElement2 = null


    }

    @SuppressWarnings("rawtypes")
    private void setMenu() {
        final MMenu mainMenu = window.getMainMenu();
        final List<MMenuElement> mainMenuItems = mainMenu.getChildren();
        final Iterator<MMenuElement> iterator = mainMenuItems.iterator();

        MMenuElement currentMainMenuItem = null;
        String label = null;
        MElementContainer menu = null;

        while (iterator.hasNext()) {
            currentMainMenuItem = iterator.next();
            label = currentMainMenuItem.getLabel();
            if (currentMainMenuItem instanceof MElementContainer) {
                menu = (MElementContainer) currentMainMenuItem;
                if (GuiContainer.PROGRAMS.equals(label)) {
                    this.menu = menu;
                    break;
                }
            }
        }

    }
}

I hope someone help me to know right way.

Why do you want to access the menu item? What type of handler is this (a command handler might not even be called from a menu)? — greg-449, Dec 07 '13 at 19:19
I would like to know what menu item was selected. The handler don't provide such information - it is only execute a method code. — Anatolii Kosorukov, Dec 07 '13 at 20:42

score 1 · Accepted Answer · answered Dec 07 '13 at 19:28

1

You should just be able to inject the MMenuItem on the method:

@CanExecute
public boolean canExecute(@Optional MMenuItem menuItem);

If the handler is not called from a menu the @Optional will mean the call will still work and the menu item will be null.

answered Dec 07 '13 at 19:28

greg-449

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`@Execute public void execute(@Optional MMenuItem menuItem) {` is correct place for getting the reference. – Anatolii Kosorukov Dec 07 '13 at 20:48

Eclipse e4. How I can get selected menu item reference?

1 Answers1