/*******************************************************************************
* Copyright (c) 2000, 2011 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.internal.*;
import org.eclipse.swt.internal.motif.*;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
/**
* Instances of this class represent a non-selectable
* user interface object that displays a string or image.
* When SEPARATOR is specified, displays a single
* vertical or horizontal line.
* <p>
* Shadow styles are hints and may not be honored
* by the platform. To create a separator label
* with the default shadow style for the platform,
* do not specify a shadow style.
* </p>
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>SEPARATOR, HORIZONTAL, VERTICAL</dd>
* <dd>SHADOW_IN, SHADOW_OUT, SHADOW_NONE</dd>
* <dd>CENTER, LEFT, RIGHT, WRAP</dd>
* <dt><b>Events:</b></dt>
* <dd>(none)</dd>
* </dl>
* <p>
* Note: Only one of SHADOW_IN, SHADOW_OUT and SHADOW_NONE may be specified.
* SHADOW_NONE is a HINT. Only one of HORIZONTAL and VERTICAL may be specified.
* Only one of CENTER, LEFT and RIGHT may be specified.
* </p><p>
* IMPORTANT: This class is <em>not</em> intended to be subclassed.
* </p>
*
* @see <a href="http://www.eclipse.org/swt/snippets/#label">Label 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>
* @noextend This class is not intended to be subclassed by clients.
*/
public class Label extends Control {
int formHandle;
String text = "";
Image image, bitmap, disabled;
/**
* 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 SWT#SEPARATOR
* @see SWT#HORIZONTAL
* @see SWT#VERTICAL
* @see SWT#SHADOW_IN
* @see SWT#SHADOW_OUT
* @see SWT#SHADOW_NONE
* @see SWT#CENTER
* @see SWT#LEFT
* @see SWT#RIGHT
* @see SWT#WRAP
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Label (Composite parent, int style) {
super (parent, checkStyle (style));
}
static int checkStyle (int style) {
style |= SWT.NO_FOCUS;
if ((style & SWT.SEPARATOR) != 0) {
style = checkBits (style, SWT.VERTICAL, SWT.HORIZONTAL, 0, 0, 0, 0);
return checkBits (style, SWT.SHADOW_OUT, SWT.SHADOW_IN, SWT.SHADOW_NONE, 0, 0, 0);
}
return checkBits (style, SWT.LEFT, SWT.CENTER, SWT.RIGHT, 0, 0, 0);
}
void _setText (String string) {
/*
* Bug in Motif. The widget will not receive mouse events, if the
* label string is empty. The fix is to detect that and set a single
* space instead.
*/
if (string.length () == 0) string = " ";
/* Strip out mnemonic marker symbols, and remember the mnemonic. */
char [] unicode = new char [string.length ()];
string.getChars (0, unicode.length, unicode, 0);
int mnemonic = fixMnemonic (unicode);
/* Wrap the text if necessary, and convert to mbcs. */
byte [] buffer = null;
if ((style & SWT.WRAP) != 0) {
int [] argList = {
OS.XmNwidth, 0, /* 1 */
OS.XmNmarginWidth, 0, /* 3 */
};
OS.XtGetValues (handle, argList, argList.length / 2);
int width = argList [1] - argList [3] * 2;
if (mnemonic != 0) string = new String (unicode);
string = display.wrapText (string, font, width);
buffer = Converter.wcsToMbcs (getCodePage (), string, true);
} else {
buffer = Converter.wcsToMbcs (getCodePage (), unicode, true);
}
int xmString = OS.XmStringGenerate(buffer, null, OS.XmCHARSET_TEXT, null);
if (xmString == 0) error (SWT.ERROR_CANNOT_SET_TEXT);
/*
* Bug in Solaris. If a mnemonic is defined to be a character
* that appears in a string in a position that follows a '\n',
* Solaris segment faults. For example, a label with text
* "Hello\nthe&re" would GP since "r" appears after '\n'.
*
* The fix is to remove mnemonics from labels that contain
* '\n', which is fine since such labels generally just act
* as descriptive texts anyways.
*/
if (mnemonic == 0 || string.indexOf ('\n') != -1) {
mnemonic = OS.XK_VoidSymbol;
}
int [] argList = {
OS.XmNlabelType, OS.XmSTRING,
OS.XmNlabelString, xmString,
OS.XmNmnemonic, mnemonic,
};
OS.XtSetValues (handle, argList, argList.length / 2);
if (xmString != 0) OS.XmStringFree (xmString);
}
public Point computeSize (int wHint, int hHint, boolean changed) {
checkWidget();
int border = getBorderWidth ();
int width = border * 2, height = border * 2;
if ((style & SWT.SEPARATOR) != 0) {
if ((style & SWT.HORIZONTAL) != 0) {
width += DEFAULT_WIDTH; height += 3;
} else {
width += 3; height += DEFAULT_HEIGHT;
}
if (wHint != SWT.DEFAULT) width = wHint + border * 2;
if (hHint != SWT.DEFAULT) height = hHint + border * 2;
return new Point (width, height);
}
int [] argList1 = {OS.XmNlabelType, 0};
OS.XtGetValues (handle, argList1, argList1.length / 2);
int labelType = argList1 [1];
if (labelType == OS.XmSTRING && (style & SWT.WRAP) != 0) {
/* If we are wrapping text, calculate the height based on wHint. */
int [] argList2 = {
OS.XmNmarginTop, 0, /* 1 */
OS.XmNmarginBottom, 0, /* 3 */
OS.XmNmarginHeight, 0, /* 5 */
OS.XmNmarginWidth, 0, /* 7 */
OS.XmNmarginLeft, 0, /* 9 */
OS.XmNmarginRight, 0, /* 11 */
};
OS.XtGetValues (handle, argList2, argList2.length / 2);
String string = text;
if (wHint != SWT.DEFAULT) {
string = display.wrapText (string, font, wHint - (argList2 [7] * 2) - argList2 [9] - argList2 [11]);
}
GC gc = new GC (this);
Point extent = gc.textExtent (string);
gc.dispose ();
height = extent.y + argList2 [1] + argList2 [3] + (argList2 [5] * 2) + (border * 2);
if (wHint == SWT.DEFAULT) {
width += extent.x + (argList2 [7] * 2) + argList2 [9] + argList2 [11];
}
} else {
/* If we are not wrapping, ask the widget for its geometry. */
XtWidgetGeometry result = new XtWidgetGeometry ();
result.request_mode = OS.CWWidth | OS.CWHeight;
OS.XtQueryGeometry (handle, null, result);
width += result.width;
height += result.height;
}
/*
* Feature in Motif. If a label's labelType is XmSTRING but
* the label string is empty, recomputing the size will
* not take into account the height of the font, as we would
* like it to. Take care of this case.
*
* Note: When the label string is empty a single space is set
* into the widget. So the preferred height is computed properly.
* Just make sure the preferred width is zero.
*/
if (labelType == OS.XmSTRING && text.length () == 0) {
width = 0;
}
if (wHint != SWT.DEFAULT) {
int [] argList3 = {
OS.XmNmarginWidth, 0, /* 1 */
OS.XmNmarginLeft, 0, /* 3 */
OS.XmNmarginRight, 0, /* 5 */
};
OS.XtGetValues (handle, argList3, argList3.length / 2);
width = wHint + (border * 2) + (argList3 [1] * 2) + argList3 [3] + argList3 [5];
}
if (hHint != SWT.DEFAULT) {
int [] argList4 = {
OS.XmNmarginHeight, 0, /* 1 */
OS.XmNmarginTop, 0, /* 3 */
OS.XmNmarginBottom, 0, /* 5 */
};
OS.XtGetValues (handle, argList4, argList4.length / 2);
height = hHint + (border * 2) + (argList4 [1] * 2) + argList4 [3] + argList4 [5];
}
return new Point (width, height);
}
void createHandle (int index) {
state |= THEME_BACKGROUND;
int parentHandle = parent.handle;
int borderWidth = (style & SWT.BORDER) != 0 ? 1 : 0;
if ((style & SWT.SEPARATOR) != 0) {
int separatorType = separatorType ();
int orientation = (style & SWT.HORIZONTAL) != 0 ? OS.XmHORIZONTAL : OS.XmVERTICAL;
int [] argList = {
OS.XmNancestorSensitive, 1,
OS.XmNborderWidth, borderWidth,
OS.XmNorientation, orientation,
OS.XmNseparatorType, separatorType,
};
handle = OS.XmCreateSeparator (parentHandle, null, argList, argList.length / 2);
if (handle == 0) error (SWT.ERROR_NO_HANDLES);
return;
}
int [] argList1 = {
OS.XmNancestorSensitive, 1,
OS.XmNmarginWidth, 0,
OS.XmNmarginHeight, 0,
OS.XmNresizePolicy, OS.XmRESIZE_NONE,
OS.XmNborderWidth, borderWidth,
};
formHandle = OS.XmCreateForm (parentHandle, null, argList1, argList1.length / 2);
if (formHandle == 0) error (SWT.ERROR_NO_HANDLES);
int alignment = OS.XmALIGNMENT_BEGINNING;
if ((style & SWT.CENTER) != 0) alignment = OS.XmALIGNMENT_CENTER;
if ((style & SWT.RIGHT) != 0) alignment = OS.XmALIGNMENT_END;
int [] argList2 = {
OS.XmNalignment, alignment,
OS.XmNtopAttachment, OS.XmATTACH_FORM,
OS.XmNleftAttachment, OS.XmATTACH_FORM,
OS.XmNrightAttachment, OS.XmATTACH_FORM,
};
/*
* Bug in Motif. The widget will not receive mouse events, if the
* label string is empty. The fix is to initialize it to a space.
*/
byte [] buffer = {(byte) ' ', 0};
handle = OS.XmCreateLabel (formHandle, buffer, argList2, argList2.length / 2);
if (handle == 0) error (SWT.ERROR_NO_HANDLES);
int [] argList3 = {OS.XmNbackground, 0};
OS.XtGetValues (handle, argList3, argList3.length / 2);
OS.XtSetValues (formHandle, argList3, argList3.length / 2);
}
int defaultBackground () {
return display.labelBackground;
}
Font defaultFont () {
return display.labelFont;
}
int defaultForeground () {
return display.labelForeground;
}
void deregister () {
super.deregister ();
if (formHandle != 0) display.removeWidget (formHandle);
}
void enableWidget (boolean enabled) {
super.enableWidget (enabled);
if (formHandle != 0) enableHandle (enabled, formHandle);
}
/**
* Returns a value which describes the position of the
* text or image in the receiver. The value will be one of
* <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>
* unless the receiver is a <code>SEPARATOR</code> label, in
* which case, <code>NONE</code> is returned.
*
* @return the alignment
*
* @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 int getAlignment () {
checkWidget();
if ((style & SWT.SEPARATOR) != 0) return SWT.LEFT;
int [] argList = {OS.XmNalignment, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
int alignment = argList [1];
if (alignment == OS.XmALIGNMENT_BEGINNING) return SWT.LEFT;
if (alignment == OS.XmALIGNMENT_CENTER) return SWT.CENTER;
if (alignment == OS.XmALIGNMENT_END)return SWT.RIGHT;
return SWT.LEFT;
}
/**
* Returns the receiver's image if it has one, or null
* if it does not.
*
* @return the receiver's image
*
* @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 Image getImage () {
checkWidget();
return image;
}
String getNameText () {
return getText ();
}
/**
* 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();
if ((style & SWT.SEPARATOR) != 0) return "";
return text;
}
void hookEvents () {
super.hookEvents ();
if (formHandle != 0) {
int windowProc = display.windowProc;
OS.XtAddEventHandler (formHandle, OS.ButtonPressMask, false, windowProc, BUTTON_PRESS);
OS.XtAddEventHandler (formHandle, OS.ButtonReleaseMask, false, windowProc, BUTTON_RELEASE);
OS.XtAddEventHandler (formHandle, OS.PointerMotionMask, false, windowProc, POINTER_MOTION);
OS.XtAddEventHandler (formHandle, OS.EnterWindowMask, false, windowProc, ENTER_WINDOW);
OS.XtAddEventHandler (formHandle, OS.LeaveWindowMask, false, windowProc, LEAVE_WINDOW);
OS.XtInsertEventHandler (formHandle, OS.ExposureMask, false, windowProc, EXPOSURE, OS.XtListTail);
}
}
void manageChildren () {
if (formHandle != 0) {
OS.XtSetMappedWhenManaged (formHandle, false);
OS.XtManageChild (formHandle);
}
super.manageChildren ();
if (formHandle != 0) {
int [] argList = {OS.XmNborderWidth, 0};
OS.XtGetValues (formHandle, argList, argList.length / 2);
OS.XtResizeWidget (formHandle, 1, 1, argList [1]);
OS.XtSetMappedWhenManaged (formHandle, true);
}
}
boolean mnemonicHit (char key) {
Composite control = this.parent;
while (control != null) {
Control [] children = control._getChildren ();
int index = 0;
while (index < children.length) {
if (children [index] == this) break;
index++;
}
index++;
if (index < children.length) {
if (children [index].setFocus ()) return true;
}
control = control.parent;
}
return false;
}
boolean mnemonicMatch (char key) {
char mnemonic = findMnemonic (getText ());
if (mnemonic == '\0') return false;
return Character.toUpperCase (key) == Character.toUpperCase (mnemonic);
}
void propagateWidget (boolean enabled) {
super.propagateWidget (enabled);
if (formHandle != 0) propagateHandle (enabled, formHandle, OS.None);
}
void realizeChildren () {
super.realizeChildren ();
setBitGravity ();
}
void redrawWidget (int x, int y, int width, int height, boolean redrawAll, boolean allChildren, boolean trim) {
super.redrawWidget (x, y, width, height, redrawAll, allChildren, trim);
if (formHandle != 0) {
short [] root_x = new short [1], root_y = new short [1];
OS.XtTranslateCoords (handle, (short) x, (short) y, root_x, root_y);
short [] label_x = new short [1], label_y = new short [1];
OS.XtTranslateCoords (formHandle, (short) 0, (short) 0, label_x, label_y);
redrawHandle (root_x [0] - label_x [0], root_y [0] - label_y [0], width, height, redrawAll, formHandle);
}
}
void register () {
super.register ();
if (formHandle != 0) display.addWidget (formHandle, this);
}
void releaseHandle () {
super.releaseHandle ();
formHandle = 0;
}
void releaseWidget () {
super.releaseWidget ();
int [] argList = {
OS.XmNlabelPixmap, OS.XmUNSPECIFIED_PIXMAP,
OS.XmNlabelInsensitivePixmap, OS.XmUNSPECIFIED_PIXMAP,
};
OS.XtSetValues (handle, argList, argList.length / 2);
if (bitmap != null) bitmap.dispose ();
if (disabled != null) disabled.dispose ();
image = bitmap = disabled = null;
}
int separatorType () {
if ((style & (SWT.SHADOW_IN)) != 0) return OS.XmSHADOW_ETCHED_IN;
if ((style & (SWT.SHADOW_OUT)) != 0) return OS.XmSHADOW_ETCHED_OUT;
return OS.XmSINGLE_LINE;
}
/**
* Controls how text and images will be displayed in the receiver.
* The argument should be one of <code>LEFT</code>, <code>RIGHT</code>
* or <code>CENTER</code>. If the receiver is a <code>SEPARATOR</code>
* label, the argument is ignored and the alignment is not changed.
*
* @param alignment the new alignment
*
* @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 setAlignment (int alignment) {
checkWidget();
if ((style & SWT.SEPARATOR) != 0) return;
int [] argList = {OS.XmNalignment, OS.XmALIGNMENT_BEGINNING};
if ((alignment & SWT.CENTER) != 0) argList [1] = OS.XmALIGNMENT_CENTER;
if ((alignment & SWT.RIGHT) != 0) argList [1] = OS.XmALIGNMENT_END;
OS.XtSetValues (handle, argList, argList.length / 2);
setBitGravity ();
}
void setBackgroundPixel (int pixel) {
super.setBackgroundPixel (pixel);
if (formHandle != 0) {
int [] argList1 = {OS.XmNforeground, 0, OS.XmNhighlightColor, 0};
OS.XtGetValues (formHandle, argList1, argList1.length / 2);
OS.XmChangeColor (formHandle, pixel);
OS.XtSetValues (formHandle, argList1, argList1.length / 2);
}
int [] argList2 = {OS.XmNlabelType, 0};
OS.XtGetValues (handle, argList2, argList2.length / 2);
if (argList2 [1] == OS.XmPIXMAP) setBitmap (image);
}
void setBitGravity () {
int xDisplay = OS.XtDisplay (handle);
if (xDisplay == 0) return;
int xWindow = OS.XtWindow (handle);
if (xWindow == 0) return;
int flags = OS.CWBitGravity;
XSetWindowAttributes attributes = new XSetWindowAttributes ();
attributes.bit_gravity = (style & SWT.LEFT) != 0 ? OS.NorthWestGravity : OS.ForgetGravity;
OS.XChangeWindowAttributes (xDisplay, xWindow, flags, attributes);
}
void setBitmap (Image image) {
int labelPixmap = OS.XmUNSPECIFIED_PIXMAP;
int labelInsensitivePixmap = OS.XmUNSPECIFIED_PIXMAP;
if (bitmap != null) bitmap.dispose ();
if (disabled != null) disabled.dispose ();
bitmap = disabled = null;
if (image != null) {
if (image.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);
switch (image.type) {
case SWT.BITMAP:
ImageData data;
if (image.mask == 0 && (data = image.getImageData ()).alpha == -1 && data.alphaData == null && data.transparentPixel == -1) {
labelPixmap = image.pixmap;
disabled = new Image (display, image, SWT.IMAGE_DISABLE);
labelInsensitivePixmap = disabled.pixmap;
break;
}
//FALL THROUGH
case SWT.ICON:
Rectangle rect = image.getBounds ();
bitmap = new Image (display, rect.width, rect.height);
GC gc = new GC (bitmap);
gc.setBackground (getBackground ());
gc.fillRectangle (rect);
gc.drawImage (image, 0, 0);
gc.dispose ();
labelPixmap = bitmap.pixmap;
disabled = new Image (display, bitmap, SWT.IMAGE_DISABLE);
labelInsensitivePixmap = disabled.pixmap;
break;
default:
error (SWT.ERROR_NOT_IMPLEMENTED);
}
}
int [] argList = {
OS.XmNlabelType, image == null ? OS.XmSTRING : OS.XmPIXMAP,
OS.XmNlabelPixmap, labelPixmap,
OS.XmNlabelInsensitivePixmap, labelInsensitivePixmap,
};
OS.XtSetValues (handle, argList, argList.length / 2);
}
boolean setBounds (int x, int y, int width, int height, boolean move, boolean resize) {
boolean changed = super.setBounds (x, y, width, height, move, resize);
if (changed && resize && (style & SWT.WRAP) != 0) {
int [] argList = {OS.XmNlabelType, 0,};
OS.XtGetValues (handle, argList, argList.length / 2);
if (argList [1] == OS.XmSTRING) _setText (text);
}
return changed;
}
public void setFont (Font font) {
checkWidget();
/*
* Bug in Motif. Setting the font in a label widget that does
* not have a non-empty string causes GP on UTF-8 locale.
* The fix is to set a non-empty string, change the font,
* and restore the empty string at the end.
*/
int [] argList1 = {OS.XmNlabelString, 0, OS.XmNlabelType, 0};
OS.XtGetValues (handle, argList1, argList1.length / 2);
boolean fixString = OS.IsDBLocale && OS.XmStringEmpty (argList1 [1]);
if (fixString) {
byte[] buffer = Converter.wcsToMbcs (getCodePage (), "string", true);
int xmString = OS.XmStringCreateLocalized (buffer);
int [] argList2 = {
OS.XmNlabelType, OS.XmSTRING,
OS.XmNlabelString, xmString,
};
OS.XtSetValues (handle, argList2, argList2.length / 2);
OS.XmStringFree (xmString);
}
super.setFont (font);
if (fixString) OS.XtSetValues (handle, argList1, argList1.length / 2);
if ((style & SWT.WRAP) != 0) {
int [] argList = {OS.XmNlabelType, 0,};
OS.XtGetValues (handle, argList, argList.length / 2);
if (argList [1] == OS.XmSTRING) _setText (text);
}
}
/**
* Sets the receiver's image to the argument, which may be
* null indicating that no image should be displayed.
*
* @param image the image to display on the receiver (may be null)
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</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 setImage (Image image) {
checkWidget();
if ((style & SWT.SEPARATOR) != 0) return;
setBitmap (this.image = image);
}
void setParentBackground () {
super.setParentBackground ();
if (formHandle != 0) setParentBackground (formHandle);
}
/**
* Sets the receiver's text.
* <p>
* This method sets the widget label. The label may include
* the mnemonic character and line delimiters.
* </p>
* <p>
* Mnemonics are indicated by an '&' that causes the next
* character to be the mnemonic. When the user presses a
* key sequence that matches the mnemonic, focus is assigned
* to the control that follows the label. 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 ((style & SWT.SEPARATOR) != 0) return;
/*
* Feature in Motif. Motif does not optimize the case
* when the same text is set into a label causing
* it to flash. The fix is to test for equality and
* do nothing.
*/
if (text.equals (string)) return;
_setText (text = string);
}
int topHandle () {
if (formHandle != 0) return formHandle;
return handle;
}
}