Java tutorial
/******************************************************************************* * Copyright (c) 2008 Nigel Westbury 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: * Nigel Westbury - initial API and implementation *******************************************************************************/ package org.eclipse.babel.runtime.dialogs; import org.eclipse.babel.runtime.Activator; import org.eclipse.babel.runtime.Messages; import org.eclipse.babel.runtime.actions.LocalizeDialog; import org.eclipse.babel.runtime.external.TranslatableNLS; import org.eclipse.babel.runtime.external.TranslatableSet; import org.eclipse.babel.runtime.external.TranslatableTextInput; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.TrayDialog; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.window.IShellProvider; import org.eclipse.swt.SWT; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Cursor; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Link; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.ToolBar; import org.eclipse.swt.widgets.ToolItem; public class LocalizableTrayDialog extends TrayDialog { private static ImageDescriptor localizationImageDescriptor = Activator.createImageDescriptor("icons/babel.gif"); //$NON-NLS-1$ protected TranslatableSet languageSet = new TranslatableSet(); /** * Creates a tray dialog instance. Note that the window will have no visual * representation (no widgets) until it is told to open. * * @param shell the parent shell, or <code>null</code> to create a top-level shell */ protected LocalizableTrayDialog(Shell shell) { super(shell); } /** * Creates a tray dialog with the given parent. * * @param parentShell the object that returns the current parent shell */ protected LocalizableTrayDialog(IShellProvider parentShell) { super(parentShell); } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.Dialog#createButtonBar(org.eclipse.swt.widgets.Composite) */ @Override protected Control createButtonBar(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(); layout.marginWidth = 0; layout.marginHeight = 0; layout.horizontalSpacing = 0; composite.setLayout(layout); composite.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false)); composite.setFont(parent.getFont()); // create the localization button Control localizationControl = createLocalizationControl(composite); ((GridData) localizationControl.getLayoutData()).horizontalIndent = convertHorizontalDLUsToPixels( IDialogConstants.HORIZONTAL_MARGIN); Control buttonSection = super.createButtonBar(composite); ((GridData) buttonSection.getLayoutData()).grabExcessHorizontalSpace = true; return composite; } /** * Creates a new help control that provides access to context help. * <p> * The <code>TrayDialog</code> implementation of this method creates * the control, registers it for selection events including selection, * Note that the parent's layout is assumed to be a <code>GridLayout</code> * and the number of columns in this layout is incremented. Subclasses may * override. * </p> * * @param parent the parent composite * @return the help control */ protected Control createLocalizationControl(Composite parent) { Image image = localizationImageDescriptor.createImage(); if (image != null) { return createLocalizationImageButton(parent, image); } return createLocalizationLink(parent); } /* * Creates a button with a help image. This is only used if there * is an image available. */ private ToolBar createLocalizationImageButton(Composite parent, Image image) { ToolBar toolBar = new ToolBar(parent, SWT.FLAT | SWT.NO_FOCUS); ((GridLayout) parent.getLayout()).numColumns++; toolBar.setLayoutData(new GridData(SWT.CENTER, SWT.FILL, false, false)); final Cursor cursor = new Cursor(parent.getDisplay(), SWT.CURSOR_HAND); toolBar.setCursor(cursor); toolBar.addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent e) { cursor.dispose(); } }); final ToolItem item = new ToolItem(toolBar, SWT.NONE); item.setImage(image); languageSet.associate("localizationToolTip", //$NON-NLS-1$ new TranslatableTextInput( Activator.getLocalizableText("LocalizableTrayDialog.localizationToolTip")) { //$NON-NLS-1$ @Override public void updateControl(String text) { item.setToolTipText(text); } }); item.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { localizationPressed(); } }); return toolBar; } /* * Creates a help link. This is used when there is no help image * available. */ private Link createLocalizationLink(Composite parent) { Link link = new Link(parent, SWT.WRAP | SWT.NO_FOCUS); ((GridLayout) parent.getLayout()).numColumns++; link.setLayoutData(new GridData(SWT.CENTER, SWT.FILL, false, false)); link.setText("<a>" + IDialogConstants.HELP_LABEL + "</a>"); //$NON-NLS-1$ //$NON-NLS-2$ link.setToolTipText(IDialogConstants.HELP_LABEL); link.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { localizationPressed(); } }); return link; } /* * Called when the user selects the action to localize this dialog. * This will bring up a dialog that can be used to localize this dialog. */ protected void localizationPressed() { Dialog dialog = new LocalizeDialog(getShell(), TranslatableNLS.bind(Messages.LocalizeDialog_Title_DialogPart, getShell().getText()), languageSet, Activator.getDefault().getMenuTextSet()); dialog.open(); } }