code: /*--------------------------------------------------------------*
    Copyright (C) 2006-2020 OpenSim Ltd.
  
    This file is distributed WITHOUT ANY WARRANTY. See the file
    'License' for details on this and other legal matters.
  *--------------------------------------------------------------*/
  
  package org.omnetpp.scave.actions.matplotlib;
  
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.jface.action.IAction;
  import org.eclipse.jface.viewers.ISelection;
  import org.omnetpp.common.image.ImageFactory;
  import org.omnetpp.scave.actions.AbstractScaveAction;
  import org.omnetpp.scave.editors.ChartScriptEditor;
  import org.omnetpp.scave.editors.ScaveEditor;
  
  /**
   * Allows zooming a Matplotlib chart to a rectangular area. Drag with the
   * left mouse button to zoom in, and with the right to zoom out.
   */
  public class ZoomAction extends AbstractScaveAction {
  
      public ZoomAction() {
          super(IAction.AS_RADIO_BUTTON);
          setText("Zoom Tool");
          setImageDescriptor(ImageFactory.global().getDescriptor(ImageFactory.TOOLBAR_IMAGE_ZOOM));
      }
  
      @Override
      protected void doRun(ScaveEditor scaveEditor, ISelection selection) throws CoreException {
          ChartScriptEditor editor = scaveEditor.getActiveChartScriptEditor();
          if (editor != null)
              editor.getMatplotlibChartViewer().zoom();
      }
  
      @Override
      protected boolean isApplicable(ScaveEditor scaveEditor, ISelection selection) {
          ChartScriptEditor editor = scaveEditor.getActiveChartScriptEditor();
          return (editor != null) && editor.isPythonProcessAlive();
      }
  }