/*******************************************************************************
* Copyright (c) 2000, 2010 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
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.accessibility.*;
/**
* 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>
*
* @see <a href="http://www.eclipse.org/swt/snippets/#link">Link snippets</a>
* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.1
* @noextend This class is not intended to be subclassed by clients.
*/
public class Link extends Control {
String text;
TextLayout layout;
Color linkColor, disabledColor;
Point [] offsets;
Point selection;
String [] ids;
int [] mnemonics;
int focusIndex;
static final RGB LINK_FOREGROUND = new RGB (0, 51, 153);
static final RGB LINK_DISABLED_FOREGROUND = new RGB (172, 168, 153);
/**
* 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 the user, 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 by the user.
* <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);
}
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, height;
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 (wHint != SWT.DEFAULT) width = wHint;
if (hHint != SWT.DEFAULT) height = hHint;
int border = getBorderWidth ();
width += border * 2;
height += border * 2;
return new Point (width, height);
}
void createHandle(int index) {
state |= HANDLE | THEME_BACKGROUND;
handle = OS.g_object_new (display.gtk_fixed_get_type (), 0);
if (handle == 0) SWT.error (SWT.ERROR_NO_HANDLES);
OS.gtk_fixed_set_has_window (handle, true);
OS.GTK_WIDGET_SET_FLAGS (handle, OS.GTK_CAN_FOCUS);
layout = new TextLayout (display);
linkColor = new Color (display, LINK_FOREGROUND);
disabledColor = new Color (display, LINK_DISABLED_FOREGROUND);
offsets = new Point [0];
ids = new String [0];
mnemonics = new int [0];
selection = new Point (-1, -1);
focusIndex = -1;
}
void createWidget (int index) {
super.createWidget (index);
layout.setFont (getFont ());
text = "";
initAccessible ();
}
void enableWidget (boolean enabled) {
super.enableWidget (enabled);
if (isDisposed ()) return;
TextStyle linkStyle = new TextStyle (null, enabled ? linkColor : disabledColor, null);
linkStyle.underline = true;
for (int i = 0; i < offsets.length; i++) {
Point point = offsets [i];
layout.setStyle (linkStyle, point.x, point.y);
}
redraw ();
}
void fixStyle () {
fixStyle (handle);
}
void initAccessible () {
Accessible accessible = getAccessible ();
accessible.addAccessibleListener (new AccessibleAdapter () {
public void getName (AccessibleEvent e) {
e.result = parse (text);
}
});
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"); //$NON-NLS-1$
}
public void getSelection (AccessibleControlEvent e) {
if (hasFocus ()) e.childID = ACC.CHILDID_SELF;
}
public void getFocus (AccessibleControlEvent e) {
if (hasFocus ()) e.childID = ACC.CHILDID_SELF;
}
});
}
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;
}
int getClientWidth () {
return (state & ZERO_WIDTH) != 0 ? 0 : OS.GTK_WIDGET_WIDTH (handle);
}
/**
* Returns the receiver's text, which will be an empty
* string if it has never been set.
*
* @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;
}
int /*long*/ gtk_button_press_event (int /*long*/ widget, int /*long*/ event) {
int /*long*/ result = super.gtk_button_press_event (widget, event);
if (result != 0) return result;
GdkEventButton gdkEvent = new GdkEventButton ();
OS.memmove (gdkEvent, event, GdkEventButton.sizeof);
if (gdkEvent.button == 1 && gdkEvent.type == OS.GDK_BUTTON_PRESS) {
if (focusIndex != -1) setFocus ();
int x = (int) gdkEvent.x;
int y = (int) gdkEvent.y;
if ((style & SWT.MIRRORED) != 0) x = getClientWidth () - x;
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)) {
focusIndex = j;
redraw ();
return result;
}
}
}
}
return result;
}
int /*long*/ gtk_button_release_event (int /*long*/ widget, int /*long*/ event) {
int /*long*/ result = super.gtk_button_release_event (widget, event);
if (result != 0) return result;
if (focusIndex == -1) return result;
GdkEventButton gdkEvent = new GdkEventButton ();
OS.memmove (gdkEvent, event, GdkEventButton.sizeof);
if (gdkEvent.button == 1) {
int x = (int) gdkEvent.x;
int y = (int) gdkEvent.y;
if ((style & SWT.MIRRORED) != 0) x = getClientWidth () - x;
Rectangle [] rects = getRectangles (focusIndex);
for (int i = 0; i < rects.length; i++) {
Rectangle rect = rects [i];
if (rect.contains (x, y)) {
Event ev = new Event ();
ev.text = ids [focusIndex];
sendSelectionEvent (SWT.Selection, ev, true);
return result;
}
}
}
return result;
}
int /*long*/ gtk_event_after (int /*long*/ widget, int /*long*/ gdkEvent) {
int /*long*/ result = super.gtk_event_after (widget, gdkEvent);
GdkEvent event = new GdkEvent ();
OS.memmove (event, gdkEvent, GdkEvent.sizeof);
switch (event.type) {
case OS.GDK_FOCUS_CHANGE:
redraw ();
break;
}
return result;
}
int /*long*/ gtk_expose_event (int /*long*/ widget, int /*long*/ eventPtr) {
if ((state & OBSCURED) != 0) return 0;
GdkEventExpose gdkEvent = new GdkEventExpose ();
OS.memmove (gdkEvent, eventPtr, GdkEventExpose.sizeof);
GCData data = new GCData ();
data.damageRgn = gdkEvent.region;
GC gc = GC.gtk_new (this, data);
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;
if ((state & DISABLED) != 0) gc.setForeground (disabledColor);
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 rect = rects [i];
gc.drawFocus (rect.x, rect.y, rect.width, rect.height);
}
}
if (hooks (SWT.Paint) || filters (SWT.Paint)) {
Event event = new Event ();
event.count = gdkEvent.count;
event.x = gdkEvent.area_x;
event.y = gdkEvent.area_y;
event.width = gdkEvent.area_width;
event.height = gdkEvent.area_height;
if ((style & SWT.MIRRORED) != 0) event.x = getClientWidth () - event.width - event.x;
event.gc = gc;
sendEvent (SWT.Paint, event);
event.gc = null;
}
gc.dispose ();
return 0;
}
int /*long*/ gtk_key_press_event (int /*long*/ widget, int /*long*/ eventPtr) {
int /*long*/ result = super.gtk_key_press_event (widget, eventPtr);
if (result != 0) return result;
if (focusIndex == -1) return result;
GdkEventKey gdkEvent = new GdkEventKey ();
OS.memmove (gdkEvent, eventPtr, GdkEventKey.sizeof);
switch (gdkEvent.keyval) {
case OS.GDK_Return:
case OS.GDK_KP_Enter:
case OS.GDK_space:
Event event = new Event ();
event.text = ids [focusIndex];
sendSelectionEvent (SWT.Selection, event, true);
break;
case OS.GDK_Tab:
if (focusIndex < offsets.length - 1) {
focusIndex++;
redraw ();
}
break;
case OS.GDK_ISO_Left_Tab:
if (focusIndex > 0) {
focusIndex--;
redraw ();
}
break;
}
return result;
}
int /*long*/ gtk_motion_notify_event (int /*long*/ widget, int /*long*/ event) {
int /*long*/ result = super.gtk_motion_notify_event (widget, event);
if (result != 0) return result;
GdkEventMotion gdkEvent = new GdkEventMotion ();
OS.memmove (gdkEvent, event, GdkEventMotion.sizeof);
int x = (int) gdkEvent.x;
int y = (int) gdkEvent.y;
if ((style & SWT.MIRRORED) != 0) x = getClientWidth () - x;
if ((gdkEvent.state & OS.GDK_BUTTON1_MASK) != 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;
}
boolean mnemonicHit (char key) {
char uckey = Character.toUpperCase (key);
String parsedText = layout.getText();
for (int i = 0; i < mnemonics.length - 1; i++) {
if (mnemonics[i] != -1) {
char mnemonic = parsedText.charAt(mnemonics[i]);
if (uckey == Character.toUpperCase (mnemonic)) {
if (!setFocus ()) return false;
focusIndex = i;
redraw ();
return true;
}
}
}
return false;
}
boolean mnemonicMatch (char key) {
char uckey = Character.toUpperCase (key);
String parsedText = layout.getText();
for (int i = 0; i < mnemonics.length - 1; i++) {
if (mnemonics[i] != -1) {
char mnemonic = parsedText.charAt(mnemonics[i]);
if (uckey == Character.toUpperCase (mnemonic)) {
return true;
}
}
}
return false;
}
void releaseWidget () {
super.releaseWidget ();
if (layout != null) layout.dispose ();
layout = null;
if (linkColor != null) linkColor.dispose ();
linkColor = null;
if (disabledColor != null) disabledColor.dispose ();
disabledColor = 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 by the user.
*
* @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);
}
String parse (String string) {
int length = string.length ();
offsets = new Point [length / 4];
ids = new String [length / 4];
mnemonics = new int [length / 4 + 1];
StringBuffer result = new StringBuffer ();
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]);
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;
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);
int offset = result.length ();
parseMnemonics (buffer, linkStart, endtagStart, result);
offsets [linkIndex] = new Point (offset, result.length () - 1);
if (ids [linkIndex] == null) {
ids [linkIndex] = new String (buffer, linkStart, endtagStart - linkStart);
}
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);
int mnemonic = parseMnemonics (buffer, Math.max (tagStart, linkStart), length, result);
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;
}
return result.toString ();
}
int parseMnemonics (char[] buffer, int start, int end, StringBuffer result) {
int mnemonic = -1, index = start;
while (index < end) {
if (buffer [index] == '&') {
if (index + 1 < end && buffer [index + 1] == '&') {
result.append (buffer [index]);
index++;
} else {
mnemonic = result.length();
}
} else {
result.append (buffer [index]);
}
index++;
}
return mnemonic;
}
int setBounds(int x, int y, int width, int height, boolean move, boolean resize) {
int result = super.setBounds (x, y, width,height, move, resize);
if ((result & RESIZED) != 0) {
layout.setWidth (width > 0 ? width : -1);
redraw ();
}
return result;
}
void setFontDescription (int /*long*/ font) {
super.setFontDescription (font);
layout.setFont (Font.gtk_new (display, font));
}
void setOrientation (boolean create) {
super.setOrientation (create);
layout.setOrientation (style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT));
if (!create) redraw (true);
}
/**
* Sets the receiver's text.
* <p>
* The string can contain both regular text and hyperlinks. A hyperlink
* is delimited by an anchor tag, <A> and </A>. 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 attribute can be used to distinguish between them. The string may
* include the mnemonic character and line delimiters. The only delimiter
* the HREF attribute supports is the quotation mark (").
* </p>
* <p>
* Mnemonics are indicated by an '&' that causes the next
* character to be the mnemonic. The receiver can have a
* mnemonic in the text preceding each link. When the user presses a
* key sequence that matches the mnemonic, focus is assigned
* to the link that follows the text. Mnemonics in links and in
* the trailing text are ignored. On most platforms,
* the mnemonic appears underlined but may be emphasised in a
* platform specific manner. The mnemonic indicator character
* '&' can be escaped by doubling it in the string, causing
* a single '&' to be displayed.
* </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;
layout.setText (parse (string));
focusIndex = offsets.length > 0 ? 0 : -1;
selection.x = selection.y = -1;
boolean enabled = (state & DISABLED) == 0;
TextStyle linkStyle = new TextStyle (null, enabled ? linkColor : disabledColor, null);
linkStyle.underline = true;
int [] bidiSegments = new int [offsets.length*2];
for (int i = 0; i < offsets.length; i++) {
Point point = offsets [i];
layout.setStyle (linkStyle, point.x, point.y);
bidiSegments[i*2] = point.x;
bidiSegments[i*2+1] = point.y+1;
}
layout.setSegments (bidiSegments);
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 showWidget () {
super.showWidget ();
fixStyle (handle);
}
int traversalCode (int key, GdkEventKey event) {
if (offsets.length == 0) return 0;
int bits = super.traversalCode (key, event);
if (key == OS.GDK_Tab && focusIndex < offsets.length - 1) {
return bits & ~SWT.TRAVERSE_TAB_NEXT;
}
if (key == OS.GDK_ISO_Left_Tab && focusIndex > 0) {
return bits & ~SWT.TRAVERSE_TAB_PREVIOUS;
}
return bits;
}
}
