plugins/org.eclipse.epp.installer.ui/src/org/eclipse/epp/installer/internal/ui/pages/InstallDirPage.java

package org.eclipse.epp.installer.internal.ui.pages;

import org.eclipse.epp.installer.ui.IWizardStep;
import org.eclipse.epp.installer.ui.InstallPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
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.DirectoryDialog;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;


/**
 * Wizard page prompting the user for an installation location
 */
public class InstallDirPage extends InstallPage
{
	private static final String DIALOG_TEXT = "Select directory to install software.";
	private static final String DIALOG_MESSAGE = "Select directory to install software.";
	private static final String LABEL_TEXT = "To select a destination folder, click Browse. Then click Next to continue.";
	private static final String BUTTON_TEXT = "Bro&wse...";

	private Text text;
	private Label label;
	private Label details;
	private Button uninstallButton;

	public InstallDirPage(IWizardStep step) {
		super(step, "Install location");
	}

	/**
	 * Create contents of the wizard
	 * 
	 * @param parent
	 */
	public void createControl(Composite parent) {
		Composite container = new Composite(parent, SWT.NULL);
		final GridLayout gridLayout = new GridLayout();
		gridLayout.numColumns = 2;
		gridLayout.marginHeight = 10;
		gridLayout.marginWidth = 15;
		container.setLayout(gridLayout);
		setControl(container);

		createTextLabel(container);
		createSelectDirBar(container);
		createUninstallButton(container);
		createDetails(container);

		updatePageComplete();
	}

	private void createTextLabel(Composite container) {
		label = new Label(container, SWT.WRAP);
		label.setText(LABEL_TEXT);
		GridData data = new GridData(GridData.FILL_HORIZONTAL);
		data.horizontalSpan = 2;
		label.setLayoutData(data); 
	}

	private void createSelectDirBar(Composite container) {
		text = new Text(container, SWT.BORDER);
		text.setLayoutData(new GridData(GridData.FILL, GridData.CENTER, true, false));
		text.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				updatePageComplete();
			}
		});

		final Button browseButton = new Button(container, SWT.NONE);
		browseButton.setText(BUTTON_TEXT);
		browseButton.addSelectionListener(new SelectionListener() {
			public void widgetSelected(SelectionEvent e) {
				String path = browse();
				if (path != null)
					text.setText(path);
				updatePageComplete();
			}

			public void widgetDefaultSelected(SelectionEvent e) {
				widgetSelected(e);
			}
		});
	}

	private void createDetails(Composite container) {
		details = new Label(container, SWT.WRAP);
		details.setText("");
		GridData data = new GridData(GridData.FILL_BOTH);
		data.horizontalSpan = 2;
		details.setLayoutData(data); 
	}
	
	private void createUninstallButton(Composite container)
	{
		uninstallButton = new Button(container, SWT.NONE);
		uninstallButton.setText("Uninstall..");
		
	}

	public void addUninstallSelectionListener(SelectionListener listener)
	{
		uninstallButton.addSelectionListener(listener);
	} 
	
	public void setVisibleUninstallButton(boolean visible)
	{
		uninstallButton.setVisible(visible);
	}
	/**
	 * Set the explainatory text that appears in the wizard page below the select field
	 *  
	 * @param text the details
	 */
	public void setDetails(String text) {
		details.setText(text != null ? text : "");
	}
	
	/**
	 * Answer the installation directory. Cannot be called before controls are created or
	 * after controls are disposed.
	 * 
	 * @return the installation directory selected by the user
	 */
	public String getInstallDir() {
		return text.getText().trim();
	}

	/**
	 * Set the installation directory. Cannot be called before controls are created or
	 * after controls are disposed.
	 * 
	 * @param pathString the installation directory
	 */
	public void setInstallDir(String pathString) {
		text.setText(pathString != null ? pathString.trim() : "");
	}
	
	/**
	 * Prompt the user for an installation location.
	 * 
	 * @return the installation location or <code>null</code> if canceled by the user
	 */
	protected String browse() {
		DirectoryDialog dialog = new DirectoryDialog(Display.getCurrent().getActiveShell());
		dialog.setText(DIALOG_TEXT);
		dialog.setMessage(DIALOG_MESSAGE);
		String path = dialog.open();
		return path;
	}
	
	public void setVisible(boolean visible) {
		super.setVisible(visible);
		if (visible)
			setDefaultFocus();
	}
	
	/**
	 * Focus on default element
	 */
	public void setDefaultFocus() {
		text.setFocus();
		text.setSelection(0,text.getText().length());
	}
}