Java tutorial
/******************************************************************************* * Copyright (c) 2010-2015 Henshin developers. 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: * TU Berlin, University of Luxembourg, SES S.A. *******************************************************************************/ /** * */ package de.tub.tfs.henshin.editor.ui.dialog.resources; import java.io.File; import java.util.Set; import org.eclipse.core.resources.IFile; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.Path; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.dialogs.TitleAreaDialog; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.FileDialog; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import de.tub.tfs.henshin.editor.util.IconUtil; /** * The Class ResourcesDialog. * * @author nam */ public class ResourcesDialog extends TitleAreaDialog implements SelectionListener { /** The message. */ protected String message; /** The resource group. */ protected ResourceSelectionGroup resourceGroup; /** The title. */ protected String title; /** The title image. */ protected Image image; /** The result. */ private File result; /** The type. */ private int type; /** * Instantiates a new resources dialog. * * @param parentShell * the parent shell * @param titleImage * the title image * @param title * the title * @param message * the message * @param type * the type */ public ResourcesDialog(Shell parentShell, ImageDescriptor titleImage, String title, String message, int type) { super(parentShell); this.image = titleImage == null ? IconUtil.getIcon("hse16.png") : titleImage.createImage(); this.title = title; this.message = message; this.type = type; } /* * (non-Javadoc) * * @see * org.eclipse.jface.window.Window#configureShell(org.eclipse.swt.widgets * .Shell) */ @Override protected void configureShell(Shell newShell) { super.configureShell(newShell); super.configureShell(newShell); newShell.setText(title); } /* * (non-Javadoc) * * @see * org.eclipse.jface.dialogs.TitleAreaDialog#createContents(org.eclipse. * swt.widgets.Composite) */ @Override protected Control createContents(Composite parent) { Control content = super.createContents(parent); setTitle(title); setTitleImage(image); setMessage(message); return content; } /* * (non-Javadoc) * * @see * org.eclipse.jface.dialogs.TitleAreaDialog#createDialogArea(org.eclipse * .swt.widgets.Composite) */ @Override protected Control createDialogArea(Composite parent) { // top level composite Composite parentComposite = (Composite) super.createDialogArea(parent); // create a composite with standard margins and spacing Composite composite = new Composite(parentComposite, SWT.NONE); GridLayout layout = new GridLayout(); layout.marginHeight = 0;// convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN); layout.marginWidth = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN); layout.verticalSpacing = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING); layout.horizontalSpacing = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING); composite.setLayout(layout); composite.setLayoutData(new GridData(GridData.FILL_BOTH)); composite.setFont(parentComposite.getFont()); Listener listener = new Listener() { @Override public void handleEvent(Event event) { setDialogComplete(validate()); } }; resourceGroup = new FileSelectionGroup(composite, listener, type == SWT.SAVE, "File name:"); return parentComposite; } /** * Sets the dialog complete. * * @param value * the new dialog complete */ protected void setDialogComplete(boolean value) { getButton(OK).setEnabled(value); } /* * (non-Javadoc) * * @see org.eclipse.jface.dialogs.Dialog#okPressed() */ @Override protected void okPressed() { IPath path = resourceGroup.getResourceFullPath(); IFile file = ResourcesPlugin.getWorkspace().getRoot().getFile(path); if (file.exists() && type == SWT.SAVE) { String[] buttons = new String[] { IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL, IDialogConstants.CANCEL_LABEL }; MessageDialog confirm = new MessageDialog(getShell(), "Overwrite Question", null, "The file" + file.getName() + " already exists. Do you want to replace the existing file?", MessageDialog.QUESTION, buttons, 0); int result = confirm.open(); switch (result) { case 0: break; case 1: return; default: cancelPressed(); break; } } this.result = file.getRawLocation().toFile(); super.okPressed(); } /** * Gets the result. * * @return the result */ public File getResult() { return result; } /* * (non-Javadoc) * * @see * org.eclipse.jface.dialogs.Dialog#createButtonsForButtonBar(org.eclipse * .swt.widgets.Composite) */ @Override protected void createButtonsForButtonBar(Composite parent) { Button fileSystemBt = new Button(parent, SWT.PUSH); GridData layoutData = new GridData(SWT.BEGINNING, SWT.FILL, true, true, 3, 1); fileSystemBt.setLayoutData(layoutData); fileSystemBt.setText("File System..."); fileSystemBt.addSelectionListener(this); ((GridLayout) parent.getLayout()).numColumns++; ((GridLayout) parent.getLayout()).numColumns++; ((GridLayout) parent.getLayout()).numColumns++; super.createButtonsForButtonBar(parent); setDialogComplete(validate()); } /** * Returns whether this page's visual components all contain valid values. * * @return otherwise */ protected boolean validate() { if (!resourceGroup.isValid()) { setErrorMessage(resourceGroup.getErrorMessage()); return false; } setErrorMessage(null); return true; } /** * Adds the file extensions. * * @param extensions * the extensions */ public void addFileExtensions(String[] extensions) { if (getShell() == null) { create(); } ((FileSelectionGroup) resourceGroup).addFileExtensions(extensions); } /* * (non-Javadoc) * * @see * org.eclipse.swt.events.SelectionListener#widgetDefaultSelected(org.eclipse * .swt.events.SelectionEvent) */ @Override public void widgetDefaultSelected(SelectionEvent e) { } /* * (non-Javadoc) * * @see * org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt * .events.SelectionEvent) */ @Override public void widgetSelected(SelectionEvent e) { FileDialog sysDiag = new FileDialog(getShell(), type); Set<String> exts = ((FileSelectionGroup) resourceGroup).getFileExtensions(); String extensions = ""; for (String ext : exts) { extensions += "*." + ext + ";"; } sysDiag.setText(title); sysDiag.setOverwrite(type == SWT.SAVE); sysDiag.setFilterExtensions(new String[] { extensions }); String fileLoc = sysDiag.open(); if (fileLoc != null) { IPath filePath = new Path(fileLoc); Set<String> expectedExt = ((FileSelectionGroup) resourceGroup).getFileExtensions(); if (expectedExt.isEmpty() || expectedExt.contains(filePath.getFileExtension())) { this.result = filePath.toFile(); super.okPressed(); } else { MessageDialog.openError(getShell(), "Save File Error", "The specified file does not have the expected extension(s): " + expectedExt.toString().replaceAll("[\\[,\\]]", "")); } } } }