CreateSecurityGroupDialog.java

/*
 * Copyright 2008-2012 Amazon Technologies, Inc. 
 *
 * 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://aws.amazon.com/apache2.0
 *
 * This file 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 com.amazonaws.eclipse.ec2.ui.securitygroups;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
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.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/**
 * Dialog to collect information on creating a new security group.
 */
public class CreateSecurityGroupDialog extends Dialog {

	/** The Text control for the security group name */
	private Text groupNameText;
	
	/** String to save the security group name after the controls are disposed */ 
	private String groupName;

	/** The Text control for the security group description */
	private Text descriptionText;
	
	/** String to save the security group description after the controls are disposed */
	private String groupDescription;

	
	/**
	 * Creates a new security group creation dialog ready to be displayed.
	 * 
	 * @param parentShell The parent shell for this dialog.
	 */
	public CreateSecurityGroupDialog(Shell parentShell) {
		super(parentShell);
	}

	/*
	 * Dialog Interface
	 */
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
	 */
	@Override
	protected Control createDialogArea(Composite parent) {
		Composite composite = createComposite(parent);

		createLabel("Security Group Name:", composite, 2);
		groupNameText = createTextBox(composite, 2);
		
		createLabel("Description:", composite, 2);
		descriptionText = createTextBox(composite, 2);
		
		return composite;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.dialogs.Dialog#okPressed()
	 */
	@Override
	protected void okPressed() {
		groupName = groupNameText.getText();
		groupDescription = descriptionText.getText();
		
		super.okPressed();
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.dialogs.Dialog#createButtonBar(org.eclipse.swt.widgets.Composite)
	 */
	@Override
	protected Control createButtonBar(Composite parent) {
		Control control = super.createButtonBar(parent);
		
		updateOkButton();
		
		return control;
	}

	
	/*
	 * Public Interface
	 */
	
	/**
	 * Returns the security group name that the user entered.
	 * 
	 * @return The security group name that the user entered.
	 */
	public String getSecurityGroupName() {
		return groupName;
	}

	/**
	 * Returns the security group description that the user entered.
	 * 
	 * @return The security group description that the user entered.
	 */
	public String getSecurityGroupDescription() {
		return groupDescription;
	}
	
	/*
	 * Private Interface
	 */
	
	private Label createLabel(String text, Composite parent, int columnSpan) {
		Label label = new Label(parent, SWT.NONE);
		label.setText(text);
		GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
		gridData.verticalAlignment = GridData.VERTICAL_ALIGN_END;
		gridData.horizontalSpan = columnSpan;
		gridData.verticalIndent = 2;
		
		label.setLayoutData(gridData);

		return label;
	}
	
	private Text createTextBox(Composite parent, int columnSpan) {
		Text text = new Text(parent, SWT.BORDER);
		GridData gridData = new GridData(GridData.FILL_BOTH);
		gridData.horizontalSpan = columnSpan;
		gridData.verticalAlignment = GridData.VERTICAL_ALIGN_BEGINNING;
		text.setLayoutData(gridData);

		text.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				updateOkButton();
			}
		});

		return text;
	}

	private Composite createComposite(Composite parent) {
		Composite composite = new Composite(parent, SWT.BORDER);		
		GridLayout gridLayout = new GridLayout(2, false);
		gridLayout.marginHeight = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN);
		gridLayout.marginWidth = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN);
		gridLayout.verticalSpacing = convertVerticalDLUsToPixels(1);
		gridLayout.horizontalSpacing = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);

		composite.setLayout(gridLayout);
		composite.setLayoutData(new GridData(GridData.FILL_BOTH));
		return composite;
	}
	
	/**
	 * Validates the user input and enables or disables the Ok button as necessary.
	 */
	private void updateOkButton() {
		boolean b = true;
		if (descriptionText == null || descriptionText.getText().length() == 0) {
			b = false;
		}
		
		if (groupNameText == null || groupNameText.getText().length() == 0) {
			b = false;
		}
		
		Button okButton = getButton(IDialogConstants.OK_ID);
		if (okButton != null) {
			okButton.setEnabled(b);
		}
	}
	
}