org.eclipse.jface.snippets.resources.Snippet057FileImageDescriptors.java Source code

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Here is the source code for org.eclipse.jface.snippets.resources.Snippet057FileImageDescriptors.java

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/*******************************************************************************
 * Copyright (c) 2006, 2014 Tom Schindl and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Tom Schindl - initial API and implementation
 *     Jeanderson Candido <http://jeandersonbc.github.io> - Bug 414565
 *******************************************************************************/
package org.eclipse.jface.snippets.resources;

import java.net.URL;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

/**
 * A snippet to demonstrate a dialog with image buttons.
 *
 */
public class Snippet057FileImageDescriptors {
    private ImageRegistry registry;

    public Snippet057FileImageDescriptors(final Shell shell) {

        Dialog dia = new Dialog(shell) {
            private ImageDescriptor getImageDescriptorFromClass(String path) {
                ImageDescriptor desc = getDescriptorBasedOn(shell, path);
                if (desc == null) {
                    desc = ImageDescriptor.createFromFile(Snippet057FileImageDescriptors.class, path);
                    registry.put(path, desc);
                }

                return desc;
            }

            private ImageDescriptor getImageDescriptorFromFile(String path) {
                ImageDescriptor desc = getDescriptorBasedOn(shell, path);
                if (desc == null) {
                    URL classPath = Snippet057FileImageDescriptors.class.getResource(path);
                    Class<?> bogus = null;
                    desc = ImageDescriptor.createFromFile(bogus, classPath.getFile());

                    registry.put(path, desc);
                }
                return desc;
            }

            private ImageDescriptor getDescriptorBasedOn(final Shell shell, String path) {
                if (registry == null) {
                    registry = new ImageRegistry(shell.getDisplay());
                }
                return registry.getDescriptor(path);
            }

            @Override
            protected Button createButton(Composite parent, int id, String label, boolean defaultButton) {
                Button b = super.createButton(parent, id, label, defaultButton);
                if (id == IDialogConstants.OK_ID) {
                    b.setImage(getImageDescriptorFromClass("filesave.png").createImage()); //$NON-NLS-1$
                    // reset the button layout
                    setButtonLayoutData(b);
                } else {
                    b.setImage(getImageDescriptorFromFile("cancel.png").createImage()); //$NON-NLS-1$
                    // reset the button layout
                    setButtonLayoutData(b);
                    return b;
                }

                return b;
            }

            @Override
            protected Control createContents(Composite parent) {
                Label label = new Label(parent, SWT.CENTER);
                label.setText("Snippet057FileImageDescriptors");
                label.setLayoutData(new GridData(SWT.FILL, SWT.NONE, true, false));
                return super.createContents(parent);
            }
        };
        dia.open();
    }

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());

        shell.open();

        new Snippet057FileImageDescriptors(shell);

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }

        display.dispose();
    }
}