How to add a pulldown button in a view's toolbar?

Question

I need to add a pulldown button to a view's toolbar in an Eclipse plugin.

Actually buttons in the toolbar are added like that :

<extension point="org.eclipse.ui.viewActions">
  <viewContribution id="..." targetId="$MyViewId$">
    <action id="..."
            toolbarPath="action1"
            class="Class extending Action and implementing IViewActionDelegate">
    </action>
  </viewContribution>
</extension>

Answer 1

I've figured it out. Two ways: one using org.eclipse.ui.viewActions extension, the other with org.eclipse.ui.menus

Using org.eclipse.ui.viewActions extension (eclipse >= 3.5)

• action's style must set to pulldown

  <extension point="org.eclipse.ui.viewActions">
    <viewContribution id="..." targetId="$MyViewId$">
      <action id="..."
              toolbarPath="action1"
              class="xxx.MyAction"
              style="pulldown">
      </action>
    </viewContribution>
  </extension>
  

• action class must implement IViewActionDelegate (required for an action contributing to a view toolbar) and IMenuCreator (defines the menu behavior).

  public class RetrieveViolationsViewActionDelegate implements IViewActionDelegate, IMenuCreator
  {
    private IAction action;
    private Menu menu;
  
  
    // IViewActionDelegate methods
    ...
  
  
    // IMenuCreator methods
    public void selectionChanged(IAction action, ISelection selection)
    {
      if (action != this.action)
      {
        action.setMenuCreator(this);
        this.action = action;
      }
    }
  
  
    public void dispose()
    {
      if (menu != null)
      {
        menu.dispose();
      }
    }
  
  
    public Menu getMenu(Control parent)
    {
      Menu menu = new Menu(parent);
      addActionToMenu(menu, new ClassImplemententingIAction());
      return menu;
    }
  
  
    public Menu getMenu(Menu parent)
    {
      // Not use
      return null;
    }
  
  
    private void addActionToMenu(Menu menu, IAction action)
    {
      ActionContributionItem item= new ActionContributionItem(action);
      item.fill(menu, -1);
    }
  }
  

Using org.eclipse.ui.menus (eclipse >= 3.3)

• Add a new menucontribution to the org.eclipse.ui.menus extension point.
• Set the location URI to toolbar:IdOfYourView
• Add a toolbar to this extension and a new command to this new toolbar.
• Change the command style to pulldown
• Create a new menucontribution and set the locationURI to menu:IdOfThePullDownCommand
• Add commands to this menu.

More info