org.eclipse.swt.examples.layoutexample.LayoutExample.java Source code

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Here is the source code for org.eclipse.swt.examples.layoutexample.LayoutExample.java

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/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.examples.layoutexample;

import java.text.MessageFormat;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ShellListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TabFolder;
import org.eclipse.swt.widgets.TabItem;

public class LayoutExample {
    private static ResourceBundle resourceBundle = ResourceBundle.getBundle("examples_layout");
    private TabFolder tabFolder;

    /**
     * Creates an instance of a LayoutExample embedded inside
     * the supplied parent Composite.
     *
     * @param parent the container of the example
     */
    public LayoutExample(Composite parent) {
        tabFolder = new TabFolder(parent, SWT.NONE);
        Tab[] tabs = new Tab[] { new FillLayoutTab(this), new RowLayoutTab(this), new GridLayoutTab(this),
                new FormLayoutTab(this), new StackLayoutTab(this) };
        for (Tab tab : tabs) {
            TabItem item = new TabItem(tabFolder, SWT.NONE);
            item.setText(tab.getTabText());
            item.setControl(tab.createTabFolderPage(tabFolder));
        }
    }

    /**
     * Grabs input focus.
     */
    public void setFocus() {
        tabFolder.setFocus();
    }

    /**
     * Disposes of all resources associated with a particular
     * instance of the LayoutExample.
     */
    public void dispose() {
        tabFolder = null;
    }

    /**
     * Invokes as a standalone program.
     */
    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        new LayoutExample(shell);
        shell.setText(getResourceString("window.title"));
        shell.addShellListener(ShellListener.shellClosedAdapter(e -> {
            Shell[] shells = display.getShells();
            for (Shell currentShell : shells) {
                if (currentShell != shell)
                    currentShell.close();
            }
        }));
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
    }

    /**
     * Gets a string from the resource bundle.
     * We don't want to crash because of a missing String.
     * Returns the key if not found.
     */
    static String getResourceString(String key) {
        try {
            return resourceBundle.getString(key);
        } catch (MissingResourceException e) {
            return key;
        } catch (NullPointerException e) {
            return "!" + key + "!";
        }
    }

    /**
     * Gets a string from the resource bundle and binds it
     * with the given arguments. If the key is not found,
     * return the key.
     */
    static String getResourceString(String key, Object[] args) {
        try {
            return MessageFormat.format(getResourceString(key), args);
        } catch (MissingResourceException e) {
            return key;
        } catch (NullPointerException e) {
            return "!" + key + "!";
        }
    }
}