package org.simantics.district.selection.ui.handlers;

import javax.inject.Inject;

import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.di.annotations.CanExecute;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.model.application.ui.basic.MPart;
import org.eclipse.e4.ui.workbench.IWorkbench;
import org.eclipse.e4.ui.workbench.modeling.EPartService;
import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
import org.eclipse.swt.widgets.Display;
import org.simantics.district.selection.ElementSelector;
import org.simantics.district.selection.ui.parts.ElementSelectionView;

public class PerformSelectionQueryHandler {

	@Inject
	EPartService partService;
	
	@CanExecute
	public boolean canExecute(ESelectionService selectionService) {
		MPart part = partService.getActivePart();
		if (part == null) return false;
		
		Object object = part.getObject();
		if (object == null || !(object instanceof ElementSelectionView))
			return false;
		
		ElementSelectionView view = (ElementSelectionView)object;
		return view.getSelectedItem() != null;
	}
	
	@Execute
	public void performElementSelection(IEclipseContext context, IWorkbench workbench) {
		MPart part = partService.getActivePart();
		if (part == null) return;
		
		Object object = part.getObject();
		if (object == null || !(object instanceof ElementSelectionView))
			return;
		
		ElementSelectionView view = (ElementSelectionView)object;
		ElementSelector selectedItem = view.getSelectedItem();
		
		Display display = context.getActive(Display.class);
		view.performSelection(display, selectedItem);
	}
}