bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/target/TargetWizardPage.java

package org.eclipse.team.internal.ui.target;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Text;

/*
 * Common superclass for wizard pages. Provides convenience methods
 * for widget creation.
 */
public abstract class TargetWizardPage extends WizardPage {
	
	private static final int COMBO_HISTORY_LENGTH = 5;
	
	/*
	 * WizardPage constructor comment.
	 * @param pageName  the name of the page
	 */
	public TargetWizardPage(String pageName) {
		super(pageName);
	}
	
	/*
	 * WizardPage constructor comment.
	 * @param pageName  the name of the page
	 * @param title  the title of the page
	 * @param titleImage  the image for the page
	 */
	public TargetWizardPage(String pageName, String title, org.eclipse.jface.resource.ImageDescriptor titleImage) {
		super(pageName, title, titleImage);
	}
	
	protected Button createRadioButton(Composite parent, String label, int span) {
		Button button = new Button(parent, SWT.RADIO);
		button.setText(label);
		GridData data = new GridData();
		data.horizontalSpan = span;
		button.setLayoutData(data);
		return button;
	}
	
	/*
	 * Creates a new checkbox instance and sets the default layout data.
	 *
	 * @param group  the composite in which to create the checkbox
	 * @param label  the string to set into the checkbox
	 * @return the new checkbox
	 */ 
	protected Button createCheckBox(Composite group, String label) {
		Button button = new Button(group, SWT.CHECK | SWT.LEFT);
		button.setText(label);
		GridData data = new GridData();
		data.horizontalSpan = 2;
		button.setLayoutData(data);
		return button;
	}
	
	/*
	 * Utility method that creates a combo box
	 *
	 * @param parent  the parent for the new label
	 * @return the new widget
	 */
	protected Combo createCombo(Composite parent) {
		Combo combo = new Combo(parent, SWT.READ_ONLY);
		GridData data = new GridData(GridData.FILL_HORIZONTAL);
		data.widthHint = IDialogConstants.ENTRY_FIELD_WIDTH;
		combo.setLayoutData(data);
		return combo;
	}
	
	/*
	 * Creates composite control and sets the default layout data.
	 *
	 * @param parent  the parent of the new composite
	 * @param numColumns  the number of columns for the new composite
	 * @return the newly-created coposite
	 */
	protected Composite createComposite(Composite parent, int numColumns) {
		Composite composite = new Composite(parent, SWT.NULL);
	
		// GridLayout
		GridLayout layout = new GridLayout();
		layout.numColumns = numColumns;
		composite.setLayout(layout);
	
		// GridData
		GridData data = new GridData();
		data.verticalAlignment = GridData.FILL;
		data.horizontalAlignment = GridData.FILL;
		composite.setLayoutData(data);
		return composite;
	}
	
	/*
	 * Utility method that creates a label instance
	 * and sets the default layout data.
	 *
	 * @param parent  the parent for the new label
	 * @param text  the text for the new label
	 * @return the new label
	 */
	protected Label createLabel(Composite parent, String text) {
		Label label = new Label(parent, SWT.LEFT);
		label.setText(text);
		GridData data = new GridData();
		data.horizontalSpan = 1;
		data.horizontalAlignment = GridData.FILL;
		label.setLayoutData(data);
		return label;
	}
	
	/*
	 * Create a text field specific for this application
	 *
	 * @param parent  the parent of the new text field
	 * @return the new text field
	 */
	protected Text createTextField(Composite parent) {
		Text text = new Text(parent, SWT.SINGLE | SWT.BORDER);
		GridData data = new GridData(GridData.FILL_HORIZONTAL);
		data.verticalAlignment = GridData.CENTER;
		data.grabExcessVerticalSpace = false;
		data.widthHint = IDialogConstants.ENTRY_FIELD_WIDTH;
		text.setLayoutData(data);
		return text;
	}
	
	/*
	 * Adds an entry to a history, while taking care of duplicate history items
	 * and excessively long histories.  The assumption is made that all histories
	 * should be of length <code>ConfigurationWizardMainPage.COMBO_HISTORY_LENGTH</code>.
	 *
	 * @param history the current history
	 * @param newEntry the entry to add to the history
	 * @return the history with the new entry appended
	 */
	protected String[] addToHistory(String[] history, String newEntry) {
		ArrayList l = new ArrayList(Arrays.asList(history));
		addToHistory(l, newEntry);
		String[] r = new String[l.size()];
		l.toArray(r);
		return r;
	}
	
	/*
	 * Adds an entry to a history, while taking care of duplicate history items
	 * and excessively long histories.  The assumption is made that all histories
	 * should be of length <code>ConfigurationWizardMainPage.COMBO_HISTORY_LENGTH</code>.
	 *
	 * @param history the current history
	 * @param newEntry the entry to add to the history
	 */
	protected void addToHistory(List history, String newEntry) {
		history.remove(newEntry);
		history.add(0,newEntry);
	
		// since only one new item was added, we can be over the limit
		// by at most one item
		if (history.size() > COMBO_HISTORY_LENGTH)
			history.remove(COMBO_HISTORY_LENGTH);
	}
	
	/*
	 * Utility method to create an editable combo box
	 * 
	 * @param parent  the parent of the combo box
	 * @return the created combo
	 */
	protected Combo createEditableCombo(Composite parent) {
		Combo combo = new Combo(parent, SWT.NULL);
		GridData data = new GridData(GridData.FILL_HORIZONTAL);
		data.widthHint = IDialogConstants.ENTRY_FIELD_WIDTH;
		combo.setLayoutData(data);
		return combo;
	}
}