ProcessWizardPage.java

/* Copyright 2012-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.snaker.designer.wizards;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
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.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.dialogs.ContainerSelectionDialog;

/**
 * 新建process 向导的页面
 * @author yuqs
 * @version 1.0
 */
public class ProcessWizardPage extends WizardPage {
	private Text containerText;
	private Text fileText;
	private ISelection selection;

	public ProcessWizardPage(ISelection selection) {
		super("wizardPage");
		setTitle("Snaker Process Editor File");
		setDescription("This wizard creates a new file with *.snaker extension that can be opened by a multi-page editor.");
		this.selection = selection;
	}

	/**
	 * 
	 */
	@Override
	public void createControl(Composite parent) {
		Composite container = new Composite(parent, 0);
		GridLayout layout = new GridLayout();
		container.setLayout(layout);
		layout.numColumns = 3;
		layout.verticalSpacing = 9;
		Label label = new Label(container, 0);
		label.setText("&Container:");

		this.containerText = new Text(container, 2052);
		GridData gd = new GridData(768);
		this.containerText.setLayoutData(gd);
		this.containerText.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				ProcessWizardPage.this.dialogChanged();
			}
		});
		Button button = new Button(container, 8);
		button.setText("Browse...");
		button.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				ProcessWizardPage.this.handleBrowse();
			}
		});
		label = new Label(container, 0);
		label.setText("&File name:");

		this.fileText = new Text(container, 2052);
		gd = new GridData(768);
		this.fileText.setLayoutData(gd);
		this.fileText.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				ProcessWizardPage.this.dialogChanged();
			}
		});
		initialize();
		dialogChanged();
		setControl(container);
	}

	private void initialize() {
		if ((this.selection != null) && (!this.selection.isEmpty())
				&& ((this.selection instanceof IStructuredSelection))) {
			IStructuredSelection ssel = (IStructuredSelection) this.selection;
			if (ssel.size() > 1)
				return;
			Object obj = ssel.getFirstElement();
			if ((obj instanceof IResource)) {
				IContainer container;
				if ((obj instanceof IContainer))
					container = (IContainer) obj;
				else
					container = ((IResource) obj).getParent();
				this.containerText.setText(container.getFullPath().toString());
			}
		}
		this.fileText.setText("fileName.snaker");
	}

	private void handleBrowse() {
		ContainerSelectionDialog dialog = new ContainerSelectionDialog(
				getShell(), ResourcesPlugin.getWorkspace().getRoot(), false,
				"Select new file container");
		if (dialog.open() == 0) {
			Object[] result = dialog.getResult();
			if (result.length == 1)
				this.containerText.setText(((Path) result[0]).toOSString());
		}
	}

	private void dialogChanged() {
		String container = getContainerName();
		String fileName = getFileName();

		if (container.length() == 0) {
			updateStatus("File container must be specified");
			return;
		}
		if (fileName.length() == 0) {
			updateStatus("File name must be specified");
			return;
		}
		int dotLoc = fileName.lastIndexOf('.');
		if (dotLoc != -1) {
			String ext = fileName.substring(dotLoc + 1);
			if (!ext.equalsIgnoreCase("snaker")) {
				updateStatus("File extension must be \"snaker\"");
				return;
			}
			
			String prefix = fileName.substring(0, dotLoc);
			if(prefix.equals("")) {
				updateStatus("File Name is empty");
				return;
			}
		}
		updateStatus(null);
	}

	private void updateStatus(String message) {
		setErrorMessage(message);
		setPageComplete(message == null);
	}

	public String getContainerName() {
		return this.containerText.getText();
	}

	public String getFileName() {
		return this.fileText.getText();
	}
}