- Where can I find a good introduction to the new API ?
There is a great IBM article ideal to discover the API.
- Where can I find id for group ?
Have a look at the following interfaces :
org.eclipse.ui.IWorkbenchActionConstants
org.eclipse.ui.navigator.ICommonMenuConstant
- Where can I find available variables ?
On the Eclipse wiki.
- Where can I find an eclipse plug-in example ?
In one ATL plug-in for instance. Here is an example where the popup menu item is displayed only when the active perspective is the right one, and the selected files extension is ecore.
- How can I get the selection for popup menu ?
Be careful the selection variable is not the same for classic menu and popup menu.
You have to use activeSelectionMenu.
- How can I do to not display the menu if the selection is empty ?
You have to use count element.
<visiblewhen checkenabled="false">
<with variable="activeMenuSelection">
<iterate operator="and">
<count value="+">
</count>
</iterate>
</with>
<visiblewhen>
- How could I call a test in Java ?
First you have to create a property tester :
<extension point="org.eclipse.core.expressions.propertyTesters">
<propertytester id="com.mycompany.project.tester.MyTester"
type="org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart"
namespace="com.mycompany.project.namespace" properties="isLikeIWant"
class="com.mycompany.project.namespace.MyTesterClass">
</propertytester>
</extension>
Then you can use it with test element :
<visiblewhen checkenabled="false">
<with variable="activeMenuSelection">
<iterate operator="and">
<instanceof value="org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart"></instanceof>
<test property="com.mycompany.project.namespace.isLikeIWant"></test>
</iterate>
</with>
</visiblewhen>
