/*
 * Copyright (c) 2003-2004 Christopher Lenz and others.
 * All rights reserved. This program and the accompanying materials 
 * are 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
 * 
 * Contributors:
 *     Christopher Lenz - initial API and implementation
 * 
 * $Id: AbstractConfigurationBlock.java,v 1.1 2004-09-02 18:11:50 jsurfer Exp $
 */

package net.sourceforge.phpeclipse.css.ui.internal.preferences;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.preference.IPreferenceStore;
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.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.layout.GridData;
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.Text;

/**
 * 
 */
abstract class AbstractConfigurationBlock {

	// Instance Variables ------------------------------------------------------

	private IPreferenceStore fPreferenceStore;

	private Map fCheckBoxes = new HashMap();
	private SelectionListener fCheckBoxListener = new SelectionListener() {
		public void widgetDefaultSelected(SelectionEvent e) {
		}
		public void widgetSelected(SelectionEvent e) {
			Button button = (Button) e.widget;
			getPreferenceStore().setValue((String) fCheckBoxes.get(button),
				button.getSelection());
		}
	};

	private Map fTextFields = new HashMap();
	private ModifyListener fTextFieldListener = new ModifyListener() {
		public void modifyText(ModifyEvent e) {
			Text text = (Text) e.widget;
			getPreferenceStore().setValue((String) fTextFields.get(text),
				text.getText());
		}
	};

	private List fNumberFields = new ArrayList();
	private ModifyListener fNumberFieldListener = new ModifyListener() {
		public void modifyText(ModifyEvent e) {
			//numberFieldChanged((Text) e.widget);
		}
	};

	private Map fLabels = new HashMap();

	// Constructors ------------------------------------------------------------

	public AbstractConfigurationBlock(IPreferenceStore store) {
		this.fPreferenceStore = store;	  
	}

	// Public Methods ----------------------------------------------------------

	public void initializeFields() {
		for (Iterator i = fCheckBoxes.keySet().iterator(); i.hasNext(); ) {
			Button button = (Button) i.next();
			String key = (String) fCheckBoxes.get(button);
			button.setSelection(getPreferenceStore().getBoolean(key));
		}
		for (Iterator i = fTextFields.keySet().iterator(); i.hasNext(); ) {
			Text text = (Text) i.next();
			String key = (String) fTextFields.get(text);
			text.setText(getPreferenceStore().getString(key));
		}
	}

	// Protected Methods -------------------------------------------------------

	protected final Button addBooleanField(Composite parent, String label,
		String key, int indentation) {

		Button checkBox = new Button(parent, SWT.CHECK);
		checkBox.setText(label);

		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
		gd.horizontalIndent = indentation;
		gd.horizontalSpan = 2;
		checkBox.setLayoutData(gd);
		checkBox.addSelectionListener(fCheckBoxListener);

		fCheckBoxes.put(checkBox, key);

		return checkBox;
	}

	protected final Control addIntegerField(Composite composite, String label,
		String key, int textLimit, int indentation) {

		Text textControl =
			addStringField(composite, label, textLimit, indentation);
		fTextFields.put(textControl, key);
		fNumberFields.add(textControl);
		textControl.addModifyListener(fNumberFieldListener);

		return textControl;
	}

	protected final Control addTextField(Composite composite, String label,
		String key, int textLimit, int indentation) {

		Text textControl =
			addStringField(composite, label, textLimit, indentation);
		fTextFields.put(textControl, key);
		textControl.addModifyListener(fTextFieldListener);

		return textControl;
	}

	protected final int convertHeightInCharsToPixels(Control control,
		int chars) {
		GC gc = new GC(control);
		gc.setFont(control.getFont());
		FontMetrics fontMetrics = gc.getFontMetrics();
		gc.dispose();
		if (fontMetrics == null) {
			return 0;
		}
		return Dialog.convertHeightInCharsToPixels(fontMetrics, chars);
	}

	protected final int convertWidthInCharsToPixels(Control control,
		int chars) {
		GC gc = new GC(control);
		gc.setFont(control.getFont());
		FontMetrics fontMetrics = gc.getFontMetrics();
		gc.dispose();
		if (fontMetrics == null) {
			return 0;
		}
		return Dialog.convertWidthInCharsToPixels(fontMetrics, chars);
	}

	protected final Control getLabel(Control field) {
		return (Control) fLabels.get(field);
	}

	protected final IPreferenceStore getPreferenceStore() {
		return fPreferenceStore;
	}

	// Private Methods ---------------------------------------------------------

	private Text addStringField(Composite composite, String label,
		int textLimit, int indentation) {

		Label labelControl = new Label(composite, SWT.NONE);
		labelControl.setText(label);
		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
		gd.horizontalIndent = indentation;
		labelControl.setLayoutData(gd);

		Text textControl = new Text(composite, SWT.BORDER | SWT.SINGLE);
		gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
		gd.widthHint = convertWidthInCharsToPixels(textControl, textLimit + 1);
		textControl.setLayoutData(gd);
		textControl.setTextLimit(textLimit);

		fLabels.put(textControl, labelControl);

		return textControl;
	}

}