watchexpressionaction.java

Python Development Environment (Python IDE plugin for Eclipse). Features editor, code completion, re

package org.python.pydev.debug.ui.actions;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.model.IDebugElement;
import org.eclipse.debug.core.model.IWatchExpression;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IEditorActionDelegate;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.python.pydev.debug.core.PydevDebugPlugin;

public class WatchExpressionAction implements IEditorActionDelegate {
	private ITextSelection fSelection;

	public void setActiveEditor(IAction action, IEditorPart targetEditor) {		
	}

	public void run(IAction action) {
		if (fSelection == null) {
			return;
		}
		String text = fSelection.getText();
		createExpression(text);	
	}

	public void selectionChanged(IAction action, ISelection selection) {
		fSelection = null;        
        if (selection instanceof ITextSelection ) {
            fSelection = (ITextSelection) selection;
        }
	}
	
	private void showExpressionsView() {		
		IWorkbenchPage page = PydevDebugPlugin.getDefault().getWorkbench().getActiveWorkbenchWindow().getActivePage();
		IViewPart part = page.findView(IDebugUIConstants.ID_EXPRESSION_VIEW);
		if (part == null) {
			try {
				page.showView(IDebugUIConstants.ID_EXPRESSION_VIEW);
			} catch (PartInitException e) {
			}
		} else {
			page.bringToTop(part);
		}

	}

	private void createExpression(String variable) {
		IWatchExpression expression = DebugPlugin.getDefault().getExpressionManager().newWatchExpression(variable);
		
		DebugPlugin.getDefault().getExpressionManager().addExpression(expression);
		IAdaptable object = DebugUITools.getDebugContext();
		IDebugElement context = null;
		if (object instanceof IDebugElement) {
			context = (IDebugElement) object;
		} else if (object instanceof ILaunch) {
			context = ((ILaunch) object).getDebugTarget();
		}
		expression.setExpressionContext(context);
		showExpressionsView();
	}
}