com.misc.common.moplaf.emf.editor.tentative.AbstractAction3.java Source code

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Here is the source code for com.misc.common.moplaf.emf.editor.tentative.AbstractAction3.java

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/*******************************************************************************
 * Copyright (c) 2017 Michel Schaffers and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Michel Schaffers - initial API and implementation
 *******************************************************************************/
package com.misc.common.moplaf.emf.editor.tentative;

import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.ui.action.WorkbenchWindowActionDelegate;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.emf.edit.domain.IEditingDomainProvider;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;

public class AbstractAction3 extends WorkbenchWindowActionDelegate {
    private Command command = null;

    protected Command constructCommand() {
        return null;
    }

    protected EditingDomain getEditingDomain() {
        IWorkbenchWindow window = this.getWindow();
        IWorkbenchPage activePage = window.getActivePage();
        IWorkbenchPart activePart = activePage.getActivePart();

        if (!(activePart instanceof IEditingDomainProvider)) {
            return null;
        }

        // get editing domain, if any
        IEditingDomainProvider editindomainprovider = (IEditingDomainProvider) activePart;

        return editindomainprovider.getEditingDomain();
    }

    protected Object getSelectedObject() {
        ISelection selection = this.getSelection();

        if (!(selection instanceof IStructuredSelection)) {
            return null;
        }
        IStructuredSelection structuredselection = (IStructuredSelection) selection;

        if (structuredselection.size() != 1) {
            return null;
        }

        return structuredselection.getFirstElement();
    }

    @Override
    public void run(IAction action) {
        this.command.execute();
    } // run method

    @Override
    public void selectionChanged(IAction action, ISelection newSelection) {
        // change the selection
        //ISelection oldSelection = this.getSelection();
        super.selectionChanged(action, newSelection);

        // get the command object

        boolean enabled = false;
        Command currentCommand = this.constructCommand();
        if (currentCommand != null) {
            enabled = currentCommand.canExecute();
            if (enabled) {
                this.command = currentCommand;
            }
        }
        action.setEnabled(enabled);

    }

    @Override
    public void dispose() {
        super.dispose();
        this.command = null;
    }

} // class body