/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Zhou Renjian - initial Java2Script implementation
 *******************************************************************************/
package org.eclipse.swt.widgets;

import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.Accessible;
import org.eclipse.swt.accessibility.AccessibleAdapter;
import org.eclipse.swt.accessibility.AccessibleControlAdapter;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.internal.RunnableCompatibility;
import org.eclipse.swt.internal.browser.OS;
import org.eclipse.swt.internal.xhtml.Element;
import org.eclipse.swt.internal.xhtml.document;

/**
 * Instances of this class represent a selectable
 * user interface object that displays a text with 
 * links.
 * <p>
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>(none)</dd>
 * <dt><b>Events:</b></dt>
 * <dd>Selection</dd>
 * </dl>
 * <p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 * 
 * @since 3.1
 * 
 * @j2sPrefix
 * $WTC$$.registerCSS ("$wt.widgets.Link");
 */
public class Link extends Control {
	String text;
	String cachedText;
	boolean textSizeCached = false;
	int textWidthCached, textHeightCached;
	String lastColor;
	Element[] anchors = new Element[0];
	
//	TextLayout layout;
//	Color linkColor, linkDisabledColor;
	Point [] offsets;
	Point selection;
	String [] ids;
	int [] mnemonics;
	int focusIndex;
	int font;
	static final RGB LINK_FOREGROUND = new RGB (0, 51, 153);
	/*
	static final int LinkProc;
	static final TCHAR LinkClass = new TCHAR (0, OS.WC_LINK, true);
	static {
		if (OS.COMCTL32_MAJOR >= 6) {
			WNDCLASS lpWndClass = new WNDCLASS ();
			OS.GetClassInfo (0, LinkClass, lpWndClass);
			LinkProc = lpWndClass.lpfnWndProc;
		} else {
			LinkProc = 0;
		}
	}
	*/

/**
 * Constructs a new instance of this class given its parent
 * and a style value describing its behavior and appearance.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>SWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together 
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>SWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p>
 *
 * @param parent a composite control which will be the parent of the new instance (cannot be null)
 * @param style the style of control to construct
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public Link (Composite parent, int style) {
	super (parent, style);
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the control is selected, by sending
 * it one of the messages defined in the <code>SelectionListener</code>
 * interface.
 * <p>
 * <code>widgetSelected</code> is called when the control is selected.
 * <code>widgetDefaultSelected</code> is not called.
 * </p>
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SelectionListener
 * @see #removeSelectionListener
 * @see SelectionEvent
 */
public void addSelectionListener (SelectionListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Selection, typedListener);
	addListener (SWT.DefaultSelection, typedListener);
}
/*
int callWindowProc (int hwnd, int msg, int wParam, int lParam) {
	if (handle == 0) return 0;
	if (LinkProc != 0) return OS.CallWindowProc (LinkProc, hwnd, msg, wParam, lParam);
	return OS.DefWindowProc (hwnd, msg, wParam, lParam);
}
*/
public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	if (wHint != SWT.DEFAULT && wHint < 0) wHint = 0;
	if (hHint != SWT.DEFAULT && hHint < 0) hHint = 0;
	int width = 0, height = 0;
	/*
	if (OS.COMCTL32_MAJOR >= 6) {
		int hDC = OS.GetDC (handle);
		int newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
		int oldFont = OS.SelectObject (hDC, newFont);
		TCHAR buffer = new TCHAR (getCodePage (), parse (text), false);
		RECT rect = new RECT ();
		int flags = OS.DT_CALCRECT;
		if (wHint != SWT.DEFAULT) {
			flags |= OS.DT_WORDBREAK;
			rect.right = wHint;
		}
		OS.DrawText (hDC, buffer, buffer.length (), rect, flags);
		width = rect.right - rect.left;
		height = rect.bottom;
		if (newFont != 0) OS.SelectObject (hDC, oldFont);
		OS.ReleaseDC (handle, hDC);
	} else {
		int layoutWidth = layout.getWidth ();
		//TEMPORARY CODE
		if (wHint == 0) {
			layout.setWidth (1);
			Rectangle rect = layout.getBounds ();
			width = 0;
			height = rect.height;
		} else {
			layout.setWidth (wHint);
			Rectangle rect = layout.getBounds ();
			width = rect.width;
			height = rect.height;
		}
		layout.setWidth (layoutWidth);
	}
	*/
	if (text != null) {
		if ((style & SWT.WRAP) != 0 && wHint != SWT.DEFAULT && hHint == SWT.DEFAULT) {
			height = OS.getStringStyledWrappedHeight(cachedText, "link-default", handle.style.cssText, wHint);
		} else {
			if (!textSizeCached || changed) {
				Point cssSize = OS.getStringStyledSize(cachedText, "link-default", handle.style.cssText);
				textSizeCached = true;
				textWidthCached = cssSize.x;
				textHeightCached = cssSize.y;
			}
			width = textWidthCached;
			height = textHeightCached;
		}
	}
	int border = getBorderWidth ();
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	width += border * 2; height += border * 2;
	return new Point (width, height);
}

void createHandle () {
	/*
	super.createHandle ();
	if (OS.COMCTL32_MAJOR < 6) {
		layout = new TextLayout (display);
		linkColor = new Color (display, LINK_FOREGROUND);
		linkDisabledColor = Color.win32_new (display, OS.GetSysColor (OS.COLOR_GRAYTEXT));
		offsets = new Point [0];
		ids = new String [0];
		mnemonics = new int [0];
		selection = new Point (-1, -1);
		focusIndex = -1;
	}
	*/
	handle = document.createElement("DIV");
	handle.className = "link-default";
	if ((style & SWT.WRAP) != 0) {
		handle.className += " link-wrap";
	}
	if ((style & SWT.BORDER) != 0) {
		handle.className += " link-border";
	}
	if (parent != null) {
		Element parentHandle = parent.containerHandle();
		if (parentHandle!= null) {
			parentHandle.appendChild(handle);
		}
	}
}

void createWidget () {
	super.createWidget ();
	text = "";
	/*
	if (OS.COMCTL32_MAJOR < 6) {
		if ((style & SWT.MIRRORED) != 0) {
			layout.setOrientation (SWT.RIGHT_TO_LEFT);
		}
		initAccessible ();
	}
	*/
}

/*
void drawWidget (GC gc, RECT rect) {
	drawBackground (gc.handle, rect);
	int selStart = selection.x;
	int selEnd = selection.y;
	if (selStart > selEnd) {
		selStart = selection.y;
		selEnd = selection.x;
	}
	// temporary code to disable text selection
	selStart = selEnd = -1;
	layout.draw (gc, 0, 0, selStart, selEnd, null, null);
	if (hasFocus () && focusIndex != -1) {
		Rectangle [] rects = getRectangles (focusIndex);
		for (int i = 0; i < rects.length; i++) {
			Rectangle rectangle = rects [i];
			gc.drawFocus (rectangle.x, rectangle.y, rectangle.width, rectangle.height);					
		}
	}
	if (hooks (SWT.Paint) || filters (SWT.Paint)) {
		Event event = new Event ();
		event.gc = gc;
		event.x = rect.left;
		event.y = rect.top;
		event.width = rect.right - rect.left;
		event.height = rect.bottom - rect.top;
		sendEvent (SWT.Paint, event);
		event.gc = null;
	}
}
*/

void enableWidget (boolean enabled) {
	/*
	if (OS.COMCTL32_MAJOR >= 6) {
		LITEM item = new LITEM ();
		item.mask = OS.LIF_ITEMINDEX | OS.LIF_STATE;
		item.stateMask = OS.LIS_ENABLED;
		item.state = enabled ? OS.LIS_ENABLED : 0;
		while (OS.SendMessage (handle, OS.LM_SETITEM, 0, item) != 0) {
			item.iLink++;
		}
	} else {
		TextStyle linkStyle = new TextStyle (null, enabled ? linkColor : linkDisabledColor, null);
		linkStyle.underline = true;
		for (int i = 0; i < offsets.length; i++) {
			Point point = offsets [i];
			layout.setStyle (linkStyle, point.x, point.y);
		}
		redraw ();
	}
	*/
	/*
	* Feature in Windows.  For some reason, setting
	* LIS_ENABLED state using LM_SETITEM causes the
	* SysLink to become enabled.  To be specific,
	* calling IsWindowEnabled() returns true.  The
	* fix is disable the SysLink after LM_SETITEM.
	*/	
	super.enableWidget (enabled);
}

/* (non-Javadoc)
 * @see org.eclipse.swt.widgets.Widget#hookSelection()
 */
void hookSelection() {
	RunnableCompatibility linkHandler = new RunnableCompatibility() {
		public void run() {
			Event e = new Event();
			e.type = SWT.Selection;
			e.item = Link.this;
			e.text = Link.this.text;
			e.widget = Link.this;
			e.display = display;
			sendEvent(SWT.Selection);
			if (!e.doit) {
				toReturn(false);
			}
		}
	};
	for (int i = 0; i < anchors.length; i++) {
		anchors[i].href = "javascript:void(0);";
		anchors[i].target = null;
		anchors[i].onclick = linkHandler;
		anchors[i].ondblclick = linkHandler;
	}
}

/**
 * @j2sIgnore
 */
void initAccessible () {
	Accessible accessible = getAccessible ();
	accessible.addAccessibleListener (new AccessibleAdapter () {
		public void getName (AccessibleEvent e) {
			e.result = parse (text, null);
		}
	});
		
	accessible.addAccessibleControlListener (new AccessibleControlAdapter () {
		public void getChildAtPoint (AccessibleControlEvent e) {
			e.childID = ACC.CHILDID_SELF;
		}
		
		public void getLocation (AccessibleControlEvent e) {
			Rectangle rect = display.map (getParent (), null, getBounds ());
			e.x = rect.x;
			e.y = rect.y;
			e.width = rect.width;
			e.height = rect.height;
		}
		
		public void getChildCount (AccessibleControlEvent e) {
			e.detail = 0;
		}
		
		public void getRole (AccessibleControlEvent e) {
			e.detail = ACC.ROLE_LINK;
		}
		
		public void getState (AccessibleControlEvent e) {
			e.detail = ACC.STATE_FOCUSABLE;
			if (hasFocus ()) e.detail |= ACC.STATE_FOCUSED;
		}
		
		public void getDefaultAction (AccessibleControlEvent e) {
			//e.result = SWT.getMessage ("SWT_Press"); //$NON-NLS-1$
			e.result = "Press"; //$NON-NLS-1$
		}
		
		public void getSelection (AccessibleControlEvent e) {
			if (hasFocus ()) e.childID = ACC.CHILDID_SELF;
		}
		
		public void getFocus (AccessibleControlEvent e) {
			if (hasFocus ()) e.childID = ACC.CHILDID_SELF;
		}
	});
}

/* (non-Javadoc)
 * @see org.eclipse.swt.widgets.Control#getBorderWidth()
 */
public int getBorderWidth() {
	return 2;
}

String getNameText () {
	return getText ();
}

/*
Rectangle [] getRectangles (int linkIndex) {
	int lineCount = layout.getLineCount ();
	Rectangle [] rects = new Rectangle [lineCount];
	int [] lineOffsets = layout.getLineOffsets ();
	Point point = offsets [linkIndex];
	int lineStart = 1;
	while (point.x > lineOffsets [lineStart]) lineStart++;
	int lineEnd = 1;
	while (point.y > lineOffsets [lineEnd]) lineEnd++;
	int index = 0;
	if (lineStart == lineEnd) {
		rects [index++] = layout.getBounds (point.x, point.y);		
	} else {
		rects [index++] = layout.getBounds (point.x, lineOffsets [lineStart]-1);
		rects [index++] = layout.getBounds (lineOffsets [lineEnd-1], point.y);
		if (lineEnd - lineStart > 1) {
			for (int i = lineStart; i < lineEnd - 1; i++) {
				rects [index++] = layout.getLineBounds (i);
			}
		}
	}
	if (rects.length != index) {
		Rectangle [] tmp = new Rectangle [index];
		System.arraycopy (rects, 0, tmp, 0, index);
		rects = tmp;
	}	
	return rects;
}
*/

/**
 * Returns the receiver's text, which will be an empty
 * string if it has never been set or if the receiver is
 * a <code>SEPARATOR</code> label.
 *
 * @return the receiver's text
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public String getText () {
	checkWidget ();
	return text;
}

String parse (String string, Object handle) {
	Element el = (Element) handle;
	int length = string.length ();
	offsets = new Point [length / 4];
	ids = new String [length / 4];
	mnemonics = new int [length / 4 + 1];
//	StringBuffer result = new StringBuffer ();
//	StringBuffer result2 = new StringBuffer ();
	char[] result = new char[0];
	char[] result2 = new char[0];
	char [] buffer = new char [length];
	string.getChars (0, string.length (), buffer, 0);
	int index = 0, state = 0, linkIndex = 0;
	int start = 0, tagStart = 0, linkStart = 0, endtagStart = 0, refStart = 0;
	while (index < length) {
		//char c = Character.toLowerCase (buffer [index]);
		char c = buffer[index];
		if (c >= 'A' && c <= 'Z') {
			c += 'a' - 'A';
		}
		switch (state) {
			case 0: 
				if (c == '<') {
					tagStart = index;
					state++;
				}
				break;
			case 1:
				if (c == 'a') state++;
				break;
			case 2:
				switch (c) {
					case 'h':
						state = 7;
						break;
					case '>':
						linkStart = index  + 1;
						state++;
						break;
					default:
						//if (Character.isWhitespace(c)) break;
						if (c == 32 || c == 160) break;
						else state = 13;
				}
				break;
			case 3:
				if (c == '<') {
					endtagStart = index;
					state++;
				}
				break;
			case 4:
				state = c == '/' ? state + 1 : 3;
				break;
			case 5:
				state = c == 'a' ? state + 1 : 3;
				break;
			case 6:
				if (c == '>') {
					mnemonics [linkIndex] = parseMnemonics (buffer, start, tagStart, result, result2, handle);
//					int offset = result.length ();
					int offset = result.length;
					Element anchor = null;
					if (handle != null) {
						anchor = document.createElement("A");
						el.appendChild(anchor);
						anchors[anchors.length] = anchor;
					}
					parseMnemonics (buffer, linkStart, endtagStart, result, result2, anchor);
//					offsets [linkIndex] = new Point (offset, result.length () - 1);
					offsets [linkIndex] = new Point (offset, result.length - 1);
					if (ids [linkIndex] == null) {
						ids [linkIndex] = new String (buffer, linkStart, endtagStart - linkStart);
					}
					if (anchor != null) {
						if ("#".equals(ids[linkIndex])) {
							anchor.href = "javascript:void(0);";
							anchor.target = "_self";
						} else {
							anchor.href = ids[linkIndex];
							anchor.target = "_blank";
						}
						String title = ids[linkIndex];
						if (title != null && title.length() > 0 && !title.startsWith("#")) {
							anchor.title = ids[linkIndex];
						}
					}
					linkIndex++;
					start = tagStart = linkStart = endtagStart = refStart = index + 1;
					state = 0;
				} else {
					state = 3;
				}
				break;
			case 7:
				state = c == 'r' ? state + 1 : 0;
				break;
			case 8:
				state = c == 'e' ? state + 1 : 0;
				break;
			case 9:
				state = c == 'f' ? state + 1 : 0;
				break;
			case 10:
				state = c == '=' ? state + 1 : 0;
				break;
			case 11:
				if (c == '"') {
					state++;
					refStart = index + 1;
				} else {
					state = 0;
				}
				break;
			case 12:
				if (c == '"') {
					ids[linkIndex] = new String (buffer, refStart, index - refStart);
					state = 2;
				}
				break;
			case 13:
				if (Character.isWhitespace (c)) {
					state = 0;
				} else if (c == '='){
					state++;
				}
				break;
			case 14:
				state = c == '"' ? state + 1 : 0;
				break;
			case 15:
				if (c == '"') state = 2;
				break;
			default:
				state = 0;
				break;
		}
		index++;
	}
	if (start < length) {
		int tmp = parseMnemonics (buffer, start, tagStart, result, result2, handle);
		int mnemonic = parseMnemonics (buffer, linkStart, index, result, result2, handle);
		if (mnemonic == -1) mnemonic = tmp;
		mnemonics [linkIndex] = mnemonic;
	} else {
		mnemonics [linkIndex] = -1;
	}
	if (offsets.length != linkIndex) {
		Point [] newOffsets = new Point [linkIndex];
		System.arraycopy (offsets, 0, newOffsets, 0, linkIndex);
		offsets = newOffsets;
		String [] newIDs = new String [linkIndex];
		System.arraycopy (ids, 0, newIDs, 0, linkIndex);
		ids = newIDs;
		int [] newMnemonics = new int [linkIndex + 1];
		System.arraycopy (mnemonics, 0, newMnemonics, 0, linkIndex + 1);
		mnemonics = newMnemonics;		
	}
//	cachedText = result2.toString();
	/**
	 * @j2sNative
	 * this.cachedText = result2.join ('');
	 */ {}
	if (anchors != null && anchors.length > 0 && (hooks(SWT.Selection) || hooks(SWT.DefaultSelection))) {
		hookSelection();
	}
	/**
	 * @j2sNative
	 * return result.join ('');
	 */ {}
	return result.toString ();
}

//int parseMnemonics (char[] buffer, int start, int end, StringBuffer result, StringBuffer result2, Object handle) {
int parseMnemonics (char[] buffer, int start, int end, char[] result, char[] result2, Object handle) {
	Element el = (Element) handle;
	int mnemonic = -1, index = start;
//	int lastIndex = result.length();
	int lastIndex = result.length;
	while (index < end) {
		char c = buffer [index];
//		result2.append(c);
		result2[result2.length] = c;
		if (c == '&') {
			if (index + 1 < end && buffer [index + 1] == '&') {
//				result.append (c);
				result[result.length] = c;
				index++;
			} else {
//				mnemonic = result.length();
				mnemonic = result.length;
				if (el != null) {
					if ((mnemonic > lastIndex) && (el != null)) {
						int len = mnemonic - lastIndex;
						char[] cs = new char[len];
//						result.getChars(lastIndex, mnemonic, cs, 0);
						for (int i = 0; i < cs.length; i++) {
							cs[i] = result[lastIndex + i];
						}
						String s = new String(cs, 0, len);
						el.appendChild(document.createTextNode(s));
					}
					lastIndex = mnemonic + 1;
					Element span = document.createElement("SPAN");
					el.appendChild(span);
					span.appendChild(document.createTextNode("" + buffer [index + 1]));
				}
			}
		} else {
//			result.append (c);
			result[result.length] = c;
		}
		boolean lineBreak = false;
		if (c == '\r') {
			if (index + 1 < end && buffer [index + 1] == '\n') {
//				result.append ('\n');
				result[result.length] = '\n';
				index++;
			}
			lineBreak = true;
		}
		if (c == '\n') {
			lineBreak = true;
		}
		if (lineBreak && el != null) {
//			int idx = result.length();
			int idx = result.length;
			if (idx > lastIndex) {
				int len = idx - lastIndex;
				char[] cs = new char[len];
//				result.getChars(lastIndex, idx, cs, 0);
				for (int i = 0; i < cs.length; i++) {
					cs[i] = result[lastIndex + i];
				}
				String s = new String(cs, 0, len);
				el.appendChild(document.createTextNode(s));
			}
			lastIndex = idx;
			el.appendChild(document.createElement("BR"));
		}
		index++;
	}
//	int idx = result.length();
	int idx = result.length;
	if (idx > lastIndex && el != null) {
		int len = idx - lastIndex;
		char[] cs = new char[len];
//		result.getChars(lastIndex, idx, cs, 0);
		for (int i = 0; i < cs.length; i++) {
			cs[i] = result[lastIndex + i];
		}
		String s = new String(cs, 0, len);
		el.appendChild(document.createTextNode(s));
	}
	return mnemonic;
}

void releaseWidget () {
	super.releaseWidget ();
//	if (layout != null) layout.dispose ();
//	layout = null;
//	if (linkColor != null) linkColor.dispose ();
//	linkColor = null;
//	linkDisabledColor = null;
	offsets = null;
	ids = null;
	mnemonics = null;
	text = null;
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the control is selected.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SelectionListener
 * @see #addSelectionListener
 */
public void removeSelectionListener (SelectionListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Selection, listener);
	eventTable.unhook (SWT.DefaultSelection, listener);
	
	if (!hooks(SWT.Selection) && !hooks(SWT.DefaultSelection)) {
		unhookSelection();
	}
}


/* (non-Javadoc)
 * @see org.eclipse.swt.widgets.Control#setEnabled(boolean)
 */
public void setEnabled(boolean enabled) {
	super.setEnabled(enabled);
	OS.updateCSSClass(handle, "link-disabled", !enabled);
	if (!enabled) {
		lastColor = handle.style.color; 
	} else {
		handle.style.color = lastColor;
		lastColor = null;
	}
}

/* (non-Javadoc)
 * @see org.eclipse.swt.widgets.Control#setForeground(org.eclipse.swt.graphics.Color)
 */
public void setForeground(Color color) {
	super.setForeground(color);
	if (lastColor != null) {
		lastColor = handle.style.color;
	}
}

/* (non-Javadoc)
 * @see org.eclipse.swt.widgets.Control#setFont(org.eclipse.swt.graphics.Font)
 */
public void setFont(Font font) {
	textSizeCached = false;
	super.setFont(font);
}

/**
 * Sets the receiver's text.
 * <p>
 * The string can contain both regular text and hyperlinks.  A hyperlink
 * is delimited by an anchor tag, &lt;A&gt; and &lt;/A&gt;.  Within an
 * anchor, a single HREF attribute is supported.  When a hyperlink is
 * selected, the text field of the selection event contains either the
 * text of the hyperlink or the value of its HREF, if one was specified.
 * In the rare case of identical hyperlinks within the same string, the
 * HREF tag can be used to distinguish between them.  The string may
 * include the mnemonic character and line delimiters.
 * </p>
 * 
 * @param string the new text
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the text is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setText (String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (string.equals (text)) return;
	text = string;
	textSizeCached = false;
	anchors = new Element[0];
	OS.clearChildren(handle);
	parse (string, handle);
	/*
	System.out.println(cachedText);
//	OS.insertText(handle, cachedText);
	System.out.println("ids==");
	for (int i = 0; i < ids.length; i++) {
		System.out.println(i + "/" + ids[i]);
	}
	System.out.println("mnemonics==");
	for (int i = 0; i < mnemonics.length; i++) {
		System.out.println(i + "/" + mnemonics[i]);
	}
	System.out.println("offsets==");
	for (int i = 0; i < offsets.length; i++) {
		System.out.println(i + "/" + offsets[i]);
	}
	*/
	/*
	if (OS.COMCTL32_MAJOR >= 6) {
		TCHAR buffer = new TCHAR (getCodePage (), string, true);
		OS.SetWindowText (handle, buffer);
		parse (string);
	} else {
		layout.setText (parse (string));	
		focusIndex = offsets.length > 0 ? 0 : -1;
		selection.x = selection.y = -1;
		int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
		if (offsets.length > 0) {
			bits |= OS.WS_TABSTOP;
		} else {
			bits &= ~OS.WS_TABSTOP;
		}
		OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
		boolean enabled = OS.IsWindowEnabled (handle);
		TextStyle linkStyle = new TextStyle (null, enabled ? linkColor : linkDisabledColor, null);
		linkStyle.underline = true;
		for (int i = 0; i < offsets.length; i++) {
			Point point = offsets [i];
			layout.setStyle (linkStyle, point.x, point.y);
		}
		TextStyle mnemonicStyle = new TextStyle (null, null, null);
		mnemonicStyle.underline = true;
		for (int i = 0; i < mnemonics.length; i++) {
			int mnemonic  = mnemonics [i];
			if (mnemonic != -1) {
				layout.setStyle (mnemonicStyle, mnemonic, mnemonic);
			}
		}
		redraw ();
	}
	*/
}

void unhookSelection() {
	for (int i = 0; i < anchors.length; i++) {
		Element anchor = anchors[i];
		anchor.onclick = null;
		anchor.ondblclick = null;
		if ("#".equals(ids[i])) {
			anchor.href = "javascript:void(0);";
			anchor.target = "_self";
		} else {
			anchor.href = ids[i];
			anchor.target = "_blank";
		}
	}
}

/*
int widgetStyle () {
	int bits = super.widgetStyle ();
	return bits | OS.WS_TABSTOP;
}

String windowClass () {
	return OS.COMCTL32_MAJOR >= 6 ? LinkClass : display.windowClass;
}

int windowProc () {
	return LinkProc != 0 ? LinkProc : display.windowProc;
}

LRESULT WM_CHAR (int wParam, int lParam) {
	LRESULT result = super.WM_CHAR (wParam, lParam);
	if (result != null) return result;
	if (OS.COMCTL32_MAJOR < 6) {
		if (focusIndex == -1) return result;
		switch (wParam) {
			case ' ':
			case SWT.CR:
				Event event = new Event ();
				event.text = ids [focusIndex];
				sendEvent (SWT.Selection, event);
				break;
			case SWT.TAB:
				boolean next = OS.GetKeyState (OS.VK_SHIFT) >= 0;
				if (next) {
					if (focusIndex < offsets.length - 1) {
						focusIndex++;
						redraw ();
					}
				} else {
					if (focusIndex > 0) {
						focusIndex--;
						redraw ();
					}
				}
				break;
		}
	} else {
		switch (wParam) {
			case ' ':
			case SWT.CR:
			case SWT.TAB:
				/*
				* NOTE: Call the window proc with WM_KEYDOWN rather than WM_CHAR
				* so that the key that was ignored during WM_KEYDOWN is processed.
				* This allows the application to cancel an operation that is normally
				* performed in WM_KEYDOWN from WM_CHAR.
				*-/
				int code = callWindowProc (handle, OS.WM_KEYDOWN, wParam, lParam);
				return new LRESULT (code);
		}
		
	}
	return result;
}

LRESULT WM_GETDLGCODE (int wParam, int lParam) {
	LRESULT result = super.WM_GETDLGCODE (wParam, lParam);
	if (result != null) return result;
	int index, count, code = 0;
	if (OS.COMCTL32_MAJOR >= 6) {
		LITEM item = new LITEM ();
		item.mask = OS.LIF_ITEMINDEX | OS.LIF_STATE;
		item.stateMask = OS.LIS_FOCUSED;
		index = 0;
		while (OS.SendMessage (handle, OS.LM_GETITEM, 0, item) != 0) {
			if ((item.state & OS.LIS_FOCUSED) != 0) {
				index = item.iLink;
			}
			item.iLink++;
		}
		count = item.iLink;
		code = callWindowProc (handle, OS.WM_GETDLGCODE, wParam, lParam);
	} else {
		index = focusIndex;
		count = offsets.length; 
	}
	if (count == 0) {
		return new LRESULT (code | OS.DLGC_STATIC);
	}
	boolean next = OS.GetKeyState (OS.VK_SHIFT) >= 0;
	if (next && index < count - 1) {
		return new LRESULT (code | OS.DLGC_WANTTAB);
	}
	if (!next && index > 0) {
		return new LRESULT (code | OS.DLGC_WANTTAB);
	}
	return result;
}

LRESULT WM_GETFONT (int wParam, int lParam) {
	LRESULT result = super.WM_GETFONT (wParam, lParam);
	if (result != null) return result;
	int code = callWindowProc (handle, OS.WM_GETFONT, wParam, lParam);
	if (code != 0) return new LRESULT (code);
	if (font == 0) font = defaultFont ();
	return new LRESULT (font);
}

LRESULT WM_KEYDOWN (int wParam, int lParam) {
	LRESULT result = super.WM_KEYDOWN (wParam, lParam);
	if (result != null) return result;
	if (OS.COMCTL32_MAJOR >= 6) {
		switch (wParam) {
			case OS.VK_SPACE:
			case OS.VK_RETURN:
			case OS.VK_TAB:
				/*
				* Ensure that the window proc does not process VK_SPACE,
				* VK_RETURN or VK_TAB so that it can be handled in WM_CHAR.
				* This allows the application to cancel an operation that
				* is normally performed in WM_KEYDOWN from WM_CHAR.
				*-/
				return LRESULT.ZERO;
		}
	}
	return result;
}

LRESULT WM_KILLFOCUS (int wParam, int lParam) {
	LRESULT result = super.WM_KILLFOCUS (wParam, lParam);
	if (OS.COMCTL32_MAJOR < 6) redraw ();
	return result;
}

LRESULT WM_LBUTTONDOWN (int wParam, int lParam) {
	LRESULT result = super.WM_LBUTTONDOWN (wParam, lParam);
	if (OS.COMCTL32_MAJOR < 6) {
		if (focusIndex != -1) setFocus ();
		int x = lParam & 0xFFFF;
		int y = lParam >> 16;
		int offset = layout.getOffset (x, y, null);
		int oldSelectionX = selection.x;
		int oldSelectionY = selection.y;
		selection.x = offset;
		selection.y = -1;
		if (oldSelectionX != -1 && oldSelectionY != -1) {
			if (oldSelectionX > oldSelectionY) {
				int temp = oldSelectionX;
				oldSelectionX = oldSelectionY;
				oldSelectionY = temp;
			}
			Rectangle rect = layout.getBounds (oldSelectionX, oldSelectionY);
			redraw (rect.x, rect.y, rect.width, rect.height, false);
		}
		for (int j = 0; j < offsets.length; j++) {
			Rectangle [] rects = getRectangles (j);
			for (int i = 0; i < rects.length; i++) {
				Rectangle rect = rects [i];
				if (rect.contains (x, y)) {
					if (j != focusIndex) {
						focusIndex = j;						
						redraw ();
					}
					return result;
				}
			}
		}
	}
	return result;
}

LRESULT WM_LBUTTONUP (int wParam, int lParam) {
	LRESULT result = super.WM_LBUTTONUP (wParam, lParam);
	if (OS.COMCTL32_MAJOR < 6) {
		if (focusIndex == -1) return result;
		int x = lParam & 0xFFFF;
		int y = lParam >> 16;
		Rectangle [] rects = getRectangles (focusIndex);
		for (int i = 0; i < rects.length; i++) {
			Rectangle rect = rects [i];
			if (rect.contains (x, y)) {
				Event event = new Event ();
				event.text = ids [focusIndex];
				sendEvent (SWT.Selection, event);
				return result;
			}
		}
	}
	return result;
}

LRESULT WM_MOUSEMOVE (int wParam, int lParam) {
	LRESULT result = super.WM_MOUSEMOVE (wParam, lParam);
	if (OS.COMCTL32_MAJOR < 6) {
		int x = lParam & 0xFFFF;
		int y = lParam >> 16;
		if (OS.GetKeyState (OS.VK_LBUTTON) < 0) {
			int oldSelection = selection.y;
			selection.y = layout.getOffset (x, y, null);
			if (selection.y != oldSelection) {
				int newSelection = selection.y;
				if (oldSelection > newSelection) {
					int temp = oldSelection;
					oldSelection = newSelection;
					newSelection = temp;
				}
				Rectangle rect = layout.getBounds (oldSelection, newSelection);
				redraw (rect.x, rect.y, rect.width, rect.height, false);
			}
		} else {
			for (int j = 0; j < offsets.length; j++) {
				Rectangle [] rects = getRectangles (j);
				for (int i = 0; i < rects.length; i++) {
					Rectangle rect = rects [i];
					if (rect.contains (x, y)) {
						setCursor (display.getSystemCursor (SWT.CURSOR_HAND));
						return result;
					}
				}
			}
			setCursor (null);
		}
	}
	return result;
}

LRESULT WM_PAINT (int wParam, int lParam) {
	if (OS.COMCTL32_MAJOR >= 6) {
		return super.WM_PAINT (wParam, lParam);
	}
	PAINTSTRUCT ps = new PAINTSTRUCT ();
	GCData data = new GCData ();
	data.ps = ps;
	data.hwnd = handle;
	GC gc = new_GC (data);
	if (gc != null) {
		int width = ps.right - ps.left;
		int height = ps.bottom - ps.top;
		if (width != 0 && height != 0) {
			RECT rect = new RECT ();
			OS.SetRect (rect, ps.left, ps.top, ps.right, ps.bottom);
			drawWidget (gc, rect);
		}
		gc.dispose ();
	}
	return LRESULT.ZERO;
}

LRESULT WM_PRINTCLIENT (int wParam, int lParam) {
	LRESULT result = super.WM_PRINTCLIENT (wParam, lParam);
	if (OS.COMCTL32_MAJOR < 6) {
		RECT rect = new RECT ();
	    OS.GetClientRect (handle, rect);
	    GCData data = new GCData ();
	    data.device = display;
	    GC gc = GC.win32_new (wParam, data);
	    drawWidget (gc, rect);
	    gc.dispose ();
	}
	return result;
}

LRESULT WM_SETFOCUS (int wParam, int lParam) {
	LRESULT result = super.WM_SETFOCUS (wParam, lParam);
	if (OS.COMCTL32_MAJOR < 6) redraw ();
	return result;
}

LRESULT WM_SETFONT (int wParam, int lParam) {
	if (OS.COMCTL32_MAJOR < 6) {
		layout.setFont (Font.win32_new (display, wParam));
	}
	return super.WM_SETFONT (font = wParam, lParam);
}

LRESULT WM_SIZE (int wParam, int lParam) {
	LRESULT result = super.WM_SIZE (wParam, lParam);
	if (OS.COMCTL32_MAJOR < 6) {
		RECT rect = new RECT ();
		OS.GetClientRect (handle, rect);
		layout.setWidth (rect.right > 0 ? rect.right : -1);
		redraw ();
	}
	return result;
}

LRESULT wmColorChild (int wParam, int lParam) {
	LRESULT result = super.wmColorChild (wParam, lParam);
	if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
		Control control = findThemeControl ();
		if (control != null) {
			OS.SetBkMode (wParam, OS.TRANSPARENT);
			RECT rect = new RECT ();
			OS.GetClientRect (control.handle, rect);
			OS.MapWindowPoints (control.handle, handle, rect, 2);
			control.drawThemeBackground (wParam, rect);
			return new LRESULT (OS.GetStockObject (OS.NULL_BRUSH));
		}
	}
	return result;
}

LRESULT wmNotifyChild (int wParam, int lParam) {
	if (OS.COMCTL32_MAJOR >= 6) {
		NMHDR hdr = new NMHDR ();
		OS.MoveMemory (hdr, lParam, NMHDR.sizeof);
		switch (hdr.code) {
			case OS.NM_RETURN:
			case OS.NM_CLICK:
				NMLINK item = new NMLINK ();
				OS.MoveMemory (item, lParam, NMLINK.sizeof);
				Event event = new Event ();
				event.text = ids [item.iLink];
				sendEvent (SWT.Selection, event);
				break;
		}
	}
	return super.wmNotifyChild (wParam, lParam);
}
*/
}
