package net.sourceforge.phpdt.externaltools.internal.ui;

/**********************************************************************
 Copyright (c) 2000, 2002 IBM Corp.  All rights reserved.
 This file is made available under the terms of the Common Public License v1.0
 which accompanies this distribution, and is available at
 http://www.eclipse.org/legal/cpl-v10.html
 **********************************************************************/

import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.SWT;
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.Shell;

/**
 * An abstract base class for dialogs with a status bar and ok/cancel buttons.
 * The status message must be passed over as StatusInfo object and can be an
 * error, warning or ok. The OK button is enabled or disabled depending on the
 * status.
 */
public abstract class StatusDialog extends Dialog {

	private Button fOkButton;

	private MessageLine fStatusLine;

	private IStatus fLastStatus;

	private String fTitle;

	private Image fImage;

	//private boolean fStatusLineAboveButtons;

	/**
	 * Creates an instane of a status dialog.
	 */
	public StatusDialog(Shell parent) {
		super(parent);
		//fStatusLineAboveButtons = false;
		fLastStatus = new StatusInfo();
	}

	/**
	 * Specifies whether status line appears to the left of the buttons
	 * (default) or above them.
	 * 
	 * @param aboveButtons
	 *            if <code>true</code> status line is placed above buttons; if
	 *            <code>false</code> to the right
	 */
//	public void setStatusLineAboveButtons(boolean aboveButtons) {
//		//fStatusLineAboveButtons = aboveButtons;
//	}

	/**
	 * Update the dialog's status line to reflect the given status. It is save
	 * to call this method before the dialog has been opened.
	 */
	protected void updateStatus(IStatus status) {
		fLastStatus = status;
		if (fStatusLine != null && !fStatusLine.isDisposed()) {
			updateButtonsEnableState(status);
			fStatusLine.setErrorStatus(status);
		}
	}

	/**
	 * Returns the last status.
	 */
	public IStatus getStatus() {
		return fLastStatus;
	}

	/**
	 * Updates the status of the ok button to reflect the given status.
	 * Subclasses may override this method to update additional buttons.
	 * 
	 * @param status
	 *            the status.
	 */
	protected void updateButtonsEnableState(IStatus status) {
		if (fOkButton != null && !fOkButton.isDisposed())
			fOkButton.setEnabled(!status.matches(IStatus.ERROR));
	}

	/*
	 * @see Window#create(Shell)
	 */
	protected void configureShell(Shell shell) {
		super.configureShell(shell);
		if (fTitle != null)
			shell.setText(fTitle);
	}

	/*
	 * @see Window#create()
	 */
	public void create() {
		super.create();
		if (fLastStatus != null) {
			// policy: dialogs are not allowed to come up with an error message
			if (fLastStatus.matches(IStatus.ERROR)) {
				StatusInfo status = new StatusInfo();
				status.setError(""); //$NON-NLS-1$
				fLastStatus = status;
			}
			updateStatus(fLastStatus);
		}
	}

	/*
	 * @see Dialog#createButtonsForButtonBar(Composite)
	 */
	protected void createButtonsForButtonBar(Composite parent) {
		fOkButton = createButton(parent, IDialogConstants.OK_ID,
				IDialogConstants.OK_LABEL, true);
		createButton(parent, IDialogConstants.CANCEL_ID,
				IDialogConstants.CANCEL_LABEL, false);
	}

	/*
	 * @see Dialog#createButtonBar(Composite)
	 */
	protected Control createButtonBar(Composite parent) {
		Composite composite = new Composite(parent, SWT.NULL);
		GridLayout layout = new GridLayout();
		layout.numColumns = 1;
		layout.marginHeight = 0;
		layout.marginWidth = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN);
		composite.setLayout(layout);
		composite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

		fStatusLine = new MessageLine(composite);
		fStatusLine.setAlignment(SWT.LEFT);
		fStatusLine.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		fStatusLine.setErrorStatus(null); //$NON-NLS-1$

		super.createButtonBar(composite);
		return composite;
	}

	/**
	 * Sets the title for this dialog.
	 * 
	 * @param title
	 *            the title.
	 */
	public void setTitle(String title) {
		fTitle = title != null ? title : ""; //$NON-NLS-1$
		Shell shell = getShell();
		if ((shell != null) && !shell.isDisposed())
			shell.setText(fTitle);
	}

	/**
	 * Sets the image for this dialog.
	 * 
	 * @param image
	 *            the image.
	 */
	public void setImage(Image image) {
		fImage = image;
		Shell shell = getShell();
		if ((shell != null) && !shell.isDisposed())
			shell.setImage(fImage);
	}

}