bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Button.java - platform/eclipse.platform.swt - Git at Google

 package org.eclipse.swt.widgets;

 /*
  * 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.swt.internal.*;
 import org.eclipse.swt.internal.gtk.*;
 import org.eclipse.swt.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.events.*;

 /**
  * Instances of this class represent a selectable user interface object that
  * issues notification when pressed and released.
  * <dl>
  * <dt><b>Styles:</b></dt>
  * <dd>ARROW, CHECK, PUSH, RADIO, TOGGLE, FLAT</dd>
  * <dd>UP, DOWN, LEFT, RIGHT, CENTER</dd>
  * <dt><b>Events:</b></dt>
  * <dd>Selection</dd>
  * </dl>
  * <p>
  * Note: Only one of the styles ARROW, CHECK, PUSH, RADIO, and TOGGLE
  * may be specified.
  * </p><p>
  * Note: Only one of the styles LEFT, RIGHT, and CENTER may be specified.
  * </p><p>
  * Note: Only one of the styles UP, DOWN, LEFT, and RIGHT may be specified
  * when the ARROW style is specified.
  * </p><p>
  * IMPORTANT: This class is intended to be subclassed <em>only</em>
  * within the SWT implementation.
  * </p>
  */
 public class Button extends Control {
 	int boxHandle, labelHandle, pixmapHandle, arrowHandle;
 	Image image;
 	String text;

 /**
  * 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#ARROW
  * @see SWT#CHECK
  * @see SWT#PUSH
  * @see SWT#RADIO
  * @see SWT#TOGGLE
  * @see SWT#FLAT
  * @see SWT#LEFT
  * @see SWT#RIGHT
  * @see SWT#CENTER
  * @see Widget#checkSubclass
  * @see Widget#getStyle
  */
 public Button (Composite parent, int style) {
 	super (parent, checkStyle (style));
 }

 static int checkStyle (int style) {
 	style = checkBits (style, SWT.PUSH, SWT.ARROW, SWT.CHECK, SWT.RADIO, SWT.TOGGLE, 0);
 	if ((style & SWT.PUSH) != 0) {
 		return checkBits (style, SWT.CENTER, SWT.LEFT, SWT.RIGHT, 0, 0, 0);
 	}
 	if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) != 0) {
 		return checkBits (style, SWT.LEFT, SWT.RIGHT, SWT.CENTER, 0, 0, 0);
 	}
 	if ((style & SWT.ARROW) != 0) {
 		return checkBits (style, SWT.UP, SWT.DOWN, SWT.LEFT, SWT.RIGHT, 0, 0);
 	}
 	return 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);
 }

 public Point computeSize (int wHint, int hHint, boolean changed) {
 	checkWidget ();
 	int width = OS.GTK_WIDGET_WIDTH (fixedHandle);
 	int height = OS.GTK_WIDGET_HEIGHT (fixedHandle);
 	OS.gtk_widget_set_size_request (handle, wHint, hHint);
 	GtkRequisition requisition = new GtkRequisition ();
 	OS.gtk_widget_size_request (handle, requisition);
 	OS.gtk_widget_set_size_request (handle, width, height);
 	width = wHint == SWT.DEFAULT ? requisition.width : wHint;
 	height = hHint == SWT.DEFAULT ? requisition.height : hHint;
 	return new Point (width, height);
 }

 void createHandle (int index) {
 	state |= HANDLE;
 	int bits = SWT.ARROW | SWT.TOGGLE | SWT.CHECK | SWT.RADIO | SWT.PUSH;
 	fixedHandle = OS.gtk_fixed_new ();
 	if (fixedHandle == 0) error (SWT.ERROR_NO_HANDLES);
 	OS.gtk_fixed_set_has_window (fixedHandle, true);
 	switch (style & bits) {
 		case SWT.ARROW:
 			int alignment = OS.GTK_ARROW_UP;
 			if ((style & SWT.UP) != 0) alignment = OS.GTK_ARROW_UP;
 			if ((style & SWT.DOWN) != 0) alignment = OS.GTK_ARROW_DOWN;
 			if ((style & SWT.LEFT) != 0) alignment = OS.GTK_ARROW_LEFT;
 			if ((style & SWT.RIGHT) != 0) alignment = OS.GTK_ARROW_RIGHT;
 			handle = OS.gtk_button_new ();
 			if (handle == 0) error (SWT.ERROR_NO_HANDLES);
 			arrowHandle = OS.gtk_arrow_new (alignment, OS.GTK_SHADOW_OUT);
 			if (arrowHandle == 0) error (SWT.ERROR_NO_HANDLES);
 			break;
 		case SWT.TOGGLE:
 			handle = OS.gtk_toggle_button_new ();
 			if (handle == 0) error (SWT.ERROR_NO_HANDLES);
 			break;
 		case SWT.CHECK:
 			handle = OS.gtk_check_button_new ();
 			if (handle == 0) error (SWT.ERROR_NO_HANDLES);
 			break;
 		case SWT.RADIO:
 			handle = OS.gtk_radio_button_new (parent.radioGroup());
 			if (handle == 0) error (SWT.ERROR_NO_HANDLES);
 			break;
 		case SWT.PUSH:
 		default:
 			handle = OS.gtk_button_new ();
 			if (handle == 0) error (SWT.ERROR_NO_HANDLES);
 			OS.GTK_WIDGET_SET_FLAGS(handle, OS.GTK_CAN_DEFAULT);
 			break;
 	}
 	if ((style & SWT.ARROW) != 0) {
 		OS.gtk_container_add (handle, arrowHandle);
 		OS.gtk_widget_show (arrowHandle);
 	} else {
 		boxHandle = OS.gtk_hbox_new (false, 0);
 		if (boxHandle == 0) error (SWT.ERROR_NO_HANDLES);
 		labelHandle = OS.gtk_label_new_with_mnemonic (null);
 		if (labelHandle == 0) error (SWT.ERROR_NO_HANDLES);
 		Display display = getDisplay ();
 		pixmapHandle = OS.gtk_pixmap_new (display.nullPixmap, 0);
 		if (pixmapHandle == 0) error (SWT.ERROR_NO_HANDLES);
 		OS.gtk_container_add (handle, boxHandle);
 		OS.gtk_container_add (boxHandle, labelHandle);
 		OS.gtk_container_add (boxHandle, pixmapHandle);
 		OS.gtk_widget_show (boxHandle);
 		OS.gtk_widget_show (labelHandle);
 	}
 	int parentHandle = parent.parentingHandle ();
 	OS.gtk_container_add (parentHandle, fixedHandle);
 	OS.gtk_container_add (fixedHandle, handle);
 	OS.gtk_widget_show (fixedHandle);
 	OS.gtk_widget_show (handle);

 	if ((style & SWT.LEFT) != 0) {
 		OS.gtk_misc_set_alignment (labelHandle, 0.0f, 0.5f);
 		OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_LEFT);
 		OS.gtk_misc_set_alignment (pixmapHandle, 0.0f, 0.5f);
 		return;
 	}
 	if ((style & SWT.CENTER) != 0) {
 		OS.gtk_misc_set_alignment (labelHandle, 0.5f, 0.5f);
 		OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_CENTER);
 		OS.gtk_misc_set_alignment (pixmapHandle, 0.5f, 0.5f);
 		return;
 	}
 	if ((style & SWT.RIGHT) != 0) {
 		OS.gtk_misc_set_alignment (labelHandle, 1.0f, 0.5f);
 		OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_RIGHT);
 		OS.gtk_misc_set_alignment (pixmapHandle, 1.0f, 0.5f);
 		return;
 	}
 }

 void createWidget (int index) {
 	super.createWidget (index);
 	text = "";
 }

 void deregister () {
 	super.deregister ();
 	if (boxHandle != 0) WidgetTable.remove (boxHandle);
 	if (labelHandle != 0) WidgetTable.remove (labelHandle);
 	if (pixmapHandle != 0) WidgetTable.remove (pixmapHandle);
 	if (arrowHandle != 0) WidgetTable.remove (arrowHandle);
 }

 int fontHandle () {
 	if (labelHandle != 0) return labelHandle;
 	return super.fontHandle ();
 }

 /**
  * 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 an <code>ARROW</code> button, in
  * which case, the alignment will indicate the direction of
  * the arrow (one of <code>LEFT</code>, <code>RIGHT</code>,
  * <code>UP</code> or <code>DOWN</code>).
  *
  * @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.ARROW) != 0) {
 		if ((style & SWT.UP) != 0) return SWT.UP;
 		if ((style & SWT.DOWN) != 0) return SWT.DOWN;
 		if ((style & SWT.LEFT) != 0) return SWT.LEFT;
 		if ((style & SWT.RIGHT) != 0) return SWT.RIGHT;
 		return SWT.UP;
 	}
 	if ((style & SWT.LEFT) != 0) return SWT.LEFT;
 	if ((style & SWT.CENTER) != 0) return SWT.CENTER;
 	if ((style & SWT.RIGHT) != 0) 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 <code>true</code> if the receiver is selected,
  * and false otherwise.
  * <p>
  * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
  * it is selected when it is checked. When it is of type <code>TOGGLE</code>,
  * it is selected when it is pushed in. If the receiver is of any other type,
  * this method returns false.
  *
  * @return the selection state
  *
  * @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 boolean getSelection () {
 	checkWidget ();
 	if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) == 0) return false;
 	return OS.gtk_toggle_button_get_active (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;
 }

 void hookEvents () {
 	super.hookEvents();
 	Display display = getDisplay ();
 	int windowProc2 = display.windowProc2;
 	OS.gtk_signal_connect (handle, OS.clicked, windowProc2, SWT.Selection);
 }

 int processFocusIn(int int0, int int1, int int2) {
 	int result = super.processFocusIn (int0, int1, int2);
 	// widget could be disposed at this point
 	if (handle == 0) return 0;
 	if ((style & SWT.PUSH) != 0 && OS.GTK_WIDGET_HAS_DEFAULT (handle)) {
 		Decorations menuShell = menuShell ();
 		menuShell.currentDefault = this;
 	}
 	return result;
 }

 int processFocusOut (int int0, int int1, int int2) {
 	int result = super.processFocusOut (int0, int1, int2);
 	// widget could be disposed at this point
 	if (handle == 0) return 0;
 	if ((style & SWT.PUSH) != 0 && !OS.GTK_WIDGET_HAS_DEFAULT (handle)) {
 		Decorations menuShell = menuShell ();
 		if (menuShell.currentDefault == this) {
 			menuShell.currentDefault = null;
 		}
 	}
 	return result;
 }

 int processSelection (int int0, int int1, int int2) {
 	postEvent(SWT.Selection);
 	return 0;
 }

 void register () {
 	super.register ();
 	if (boxHandle != 0) WidgetTable.put (boxHandle, this);
 	if (labelHandle != 0) WidgetTable.put (labelHandle, this);
 	if (pixmapHandle != 0) WidgetTable.put (pixmapHandle, this);
 	if (arrowHandle != 0) WidgetTable.put (arrowHandle, this);
 }

 void releaseHandle () {
 	super.releaseHandle ();
 	boxHandle = pixmapHandle = labelHandle = arrowHandle = 0;
 }

 void releaseWidget () {
 	super.releaseWidget ();
 	image = 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 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);
 }

 /**
  * Controls how text, images and arrows will be displayed
  * in the receiver. The argument should be one of
  * <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>
  * unless the receiver is an <code>ARROW</code> button, in
  * which case, the argument indicates the direction of
  * the arrow (one of <code>LEFT</code>, <code>RIGHT</code>,
  * <code>UP</code> or <code>DOWN</code>).
  *
  * @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.ARROW) != 0) {
 		if ((style & (SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT)) == 0) return;
 		style &= ~(SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT);
 		style |= alignment & (SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT);
 		int arrow_type = OS.GTK_ARROW_UP;
 		switch (alignment) {
 			case SWT.UP: arrow_type = OS.GTK_ARROW_UP; break;
 			case SWT.DOWN: arrow_type = OS.GTK_ARROW_DOWN; break;
 			case SWT.LEFT: arrow_type = OS.GTK_ARROW_LEFT; break;
 			case SWT.RIGHT: arrow_type = OS.GTK_ARROW_RIGHT; break;
 		}
 		OS.gtk_arrow_set (arrowHandle, arrow_type, OS.GTK_SHADOW_OUT);
 		return;
 	}
 	if ((alignment & (SWT.LEFT | SWT.RIGHT | SWT.CENTER)) == 0) return;
 	style &= ~(SWT.LEFT | SWT.RIGHT | SWT.CENTER);
 	style |= alignment & (SWT.LEFT | SWT.RIGHT | SWT.CENTER);
 	if ((style & SWT.LEFT) != 0) {
 		OS.gtk_misc_set_alignment (labelHandle, 0.0f, 0.5f);
 		OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_LEFT);
 		OS.gtk_misc_set_alignment (pixmapHandle, 0.0f, 0.5f);
 		return;
 	}
 	if ((style & SWT.CENTER) != 0) {
 		OS.gtk_misc_set_alignment (labelHandle, 0.5f, 0.5f);
 		OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_CENTER);
 		OS.gtk_misc_set_alignment (pixmapHandle, 0.5f, 0.5f);
 		return;
 	}
 	if ((style & SWT.RIGHT) != 0) {
 		OS.gtk_misc_set_alignment (labelHandle, 1.0f, 0.5f);
 		OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_RIGHT);
 		OS.gtk_misc_set_alignment (pixmapHandle, 1.0f, 0.5f);
 		return;
 	}
 }

 void setBackgroundColor (GdkColor color) {
 	super.setBackgroundColor (color);
 	OS.gtk_widget_modify_bg (fixedHandle, 0, color);
 	if (labelHandle != 0) OS.gtk_widget_modify_bg (labelHandle, 0, color);
 	if (pixmapHandle != 0) OS.gtk_widget_modify_bg (pixmapHandle, 0, color);
 }

 void setFontDescription (int font) {
 	super.setFontDescription (font);
 	if (labelHandle != 0) OS.gtk_widget_modify_font (labelHandle, font);
 	if (pixmapHandle != 0) OS.gtk_widget_modify_font (pixmapHandle, font);
 }

 void setForegroundColor (GdkColor color) {
 	super.setForegroundColor (color);
 	OS.gtk_widget_modify_fg (fixedHandle, 0, color);
 	if (labelHandle != 0) OS.gtk_widget_modify_fg (labelHandle, 0, color);
 	if (pixmapHandle != 0) OS.gtk_widget_modify_fg (pixmapHandle, 0, color);
 }

 /**
  * 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 ();
 	Image oldImage = this.image;
 	this.image = image;
 	if ((style & SWT.ARROW) != 0) return;
 	OS.gtk_widget_hide (labelHandle);
 	if (image != null) {
 		OS.gtk_pixmap_set (pixmapHandle, image.pixmap, image.mask);
 		OS.gtk_widget_show (pixmapHandle);
 	} else {
 		Display display = getDisplay ();
 		OS.gtk_pixmap_set (pixmapHandle, display.nullPixmap, 0);
 		OS.gtk_widget_hide (pixmapHandle);
 	}
 	if (oldImage == image) OS.gtk_widget_queue_draw (pixmapHandle);
 }

 /**
  * Sets the selection state of the receiver, if it is of type <code>CHECK</code>,
  * <code>RADIO</code>, or <code>TOGGLE</code>.
  *
  * <p>
  * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
  * it is selected when it is checked. When it is of type <code>TOGGLE</code>,
  * it is selected when it is pushed in.
  *
  * @param selected the new selection state
  *
  * @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 setSelection (boolean selected) {
 	checkWidget();
 	if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) == 0) return;
 	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
 	OS.gtk_toggle_button_set_active (handle, selected);
 	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
 }

 /**
  * Sets the receiver's text.
  * <p>
  * This method sets the button label.  The label may include
  * the mnemonic character but must not contain 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);
 	text = string;
 	if ((style & SWT.ARROW) != 0) return;
 	char [] chars = fixMnemonic (string);
 	byte [] buffer = Converter.wcsToMbcs (null, chars);
 	OS.gtk_label_set_text_with_mnemonic (labelHandle, buffer);
 	OS.gtk_widget_hide (pixmapHandle);
 	if (string.length () != 0) {
 		OS.gtk_widget_show (labelHandle);
 	} else {
 		OS.gtk_widget_hide (labelHandle);
 	}
 }

 int traversalCode (int key, int event) {
 	int code = super.traversalCode (key, event);
 	if ((style & SWT.PUSH) != 0) return code;
 	return code | SWT.TRAVERSE_ARROW_NEXT | SWT.TRAVERSE_ARROW_PREVIOUS;
 }

 }
	package org.eclipse.swt.widgets;

	/*
	* 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.swt.internal.*;
	import org.eclipse.swt.internal.gtk.*;
	import org.eclipse.swt.*;
	import org.eclipse.swt.graphics.*;
	import org.eclipse.swt.events.*;

	/**
	* Instances of this class represent a selectable user interface object that
	* issues notification when pressed and released.
	* <dl>
	* <dt><b>Styles:</b></dt>
	* <dd>ARROW, CHECK, PUSH, RADIO, TOGGLE, FLAT</dd>
	* <dd>UP, DOWN, LEFT, RIGHT, CENTER</dd>
	* <dt><b>Events:</b></dt>
	* <dd>Selection</dd>
	* </dl>
	* <p>
	* Note: Only one of the styles ARROW, CHECK, PUSH, RADIO, and TOGGLE
	* may be specified.
	* </p><p>
	* Note: Only one of the styles LEFT, RIGHT, and CENTER may be specified.
	* </p><p>
	* Note: Only one of the styles UP, DOWN, LEFT, and RIGHT may be specified
	* when the ARROW style is specified.
	* </p><p>
	* IMPORTANT: This class is intended to be subclassed <em>only</em>
	* within the SWT implementation.
	* </p>
	*/
	public class Button extends Control {
	int boxHandle, labelHandle, pixmapHandle, arrowHandle;
	Image image;
	String text;

	/**
	* 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#ARROW
	* @see SWT#CHECK
	* @see SWT#PUSH
	* @see SWT#RADIO
	* @see SWT#TOGGLE
	* @see SWT#FLAT
	* @see SWT#LEFT
	* @see SWT#RIGHT
	* @see SWT#CENTER
	* @see Widget#checkSubclass
	* @see Widget#getStyle
	*/
	public Button (Composite parent, int style) {
	super (parent, checkStyle (style));
	}

	static int checkStyle (int style) {
	style = checkBits (style, SWT.PUSH, SWT.ARROW, SWT.CHECK, SWT.RADIO, SWT.TOGGLE, 0);
	if ((style & SWT.PUSH) != 0) {
	return checkBits (style, SWT.CENTER, SWT.LEFT, SWT.RIGHT, 0, 0, 0);
	}
	if ((style & (SWT.CHECK \| SWT.RADIO \| SWT.TOGGLE)) != 0) {
	return checkBits (style, SWT.LEFT, SWT.RIGHT, SWT.CENTER, 0, 0, 0);
	}
	if ((style & SWT.ARROW) != 0) {
	return checkBits (style, SWT.UP, SWT.DOWN, SWT.LEFT, SWT.RIGHT, 0, 0);
	}
	return 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);
	}

	public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	int width = OS.GTK_WIDGET_WIDTH (fixedHandle);
	int height = OS.GTK_WIDGET_HEIGHT (fixedHandle);
	OS.gtk_widget_set_size_request (handle, wHint, hHint);
	GtkRequisition requisition = new GtkRequisition ();
	OS.gtk_widget_size_request (handle, requisition);
	OS.gtk_widget_set_size_request (handle, width, height);
	width = wHint == SWT.DEFAULT ? requisition.width : wHint;
	height = hHint == SWT.DEFAULT ? requisition.height : hHint;
	return new Point (width, height);
	}

	void createHandle (int index) {
	state \|= HANDLE;
	int bits = SWT.ARROW \| SWT.TOGGLE \| SWT.CHECK \| SWT.RADIO \| SWT.PUSH;
	fixedHandle = OS.gtk_fixed_new ();
	if (fixedHandle == 0) error (SWT.ERROR_NO_HANDLES);
	OS.gtk_fixed_set_has_window (fixedHandle, true);
	switch (style & bits) {
	case SWT.ARROW:
	int alignment = OS.GTK_ARROW_UP;
	if ((style & SWT.UP) != 0) alignment = OS.GTK_ARROW_UP;
	if ((style & SWT.DOWN) != 0) alignment = OS.GTK_ARROW_DOWN;
	if ((style & SWT.LEFT) != 0) alignment = OS.GTK_ARROW_LEFT;
	if ((style & SWT.RIGHT) != 0) alignment = OS.GTK_ARROW_RIGHT;
	handle = OS.gtk_button_new ();
	if (handle == 0) error (SWT.ERROR_NO_HANDLES);
	arrowHandle = OS.gtk_arrow_new (alignment, OS.GTK_SHADOW_OUT);
	if (arrowHandle == 0) error (SWT.ERROR_NO_HANDLES);
	break;
	case SWT.TOGGLE:
	handle = OS.gtk_toggle_button_new ();
	if (handle == 0) error (SWT.ERROR_NO_HANDLES);
	break;
	case SWT.CHECK:
	handle = OS.gtk_check_button_new ();
	if (handle == 0) error (SWT.ERROR_NO_HANDLES);
	break;
	case SWT.RADIO:
	handle = OS.gtk_radio_button_new (parent.radioGroup());
	if (handle == 0) error (SWT.ERROR_NO_HANDLES);
	break;
	case SWT.PUSH:
	default:
	handle = OS.gtk_button_new ();
	if (handle == 0) error (SWT.ERROR_NO_HANDLES);
	OS.GTK_WIDGET_SET_FLAGS(handle, OS.GTK_CAN_DEFAULT);
	break;
	}
	if ((style & SWT.ARROW) != 0) {
	OS.gtk_container_add (handle, arrowHandle);
	OS.gtk_widget_show (arrowHandle);
	} else {
	boxHandle = OS.gtk_hbox_new (false, 0);
	if (boxHandle == 0) error (SWT.ERROR_NO_HANDLES);
	labelHandle = OS.gtk_label_new_with_mnemonic (null);
	if (labelHandle == 0) error (SWT.ERROR_NO_HANDLES);
	Display display = getDisplay ();
	pixmapHandle = OS.gtk_pixmap_new (display.nullPixmap, 0);
	if (pixmapHandle == 0) error (SWT.ERROR_NO_HANDLES);
	OS.gtk_container_add (handle, boxHandle);
	OS.gtk_container_add (boxHandle, labelHandle);
	OS.gtk_container_add (boxHandle, pixmapHandle);
	OS.gtk_widget_show (boxHandle);
	OS.gtk_widget_show (labelHandle);
	}
	int parentHandle = parent.parentingHandle ();
	OS.gtk_container_add (parentHandle, fixedHandle);
	OS.gtk_container_add (fixedHandle, handle);
	OS.gtk_widget_show (fixedHandle);
	OS.gtk_widget_show (handle);

	if ((style & SWT.LEFT) != 0) {
	OS.gtk_misc_set_alignment (labelHandle, 0.0f, 0.5f);
	OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_LEFT);
	OS.gtk_misc_set_alignment (pixmapHandle, 0.0f, 0.5f);
	return;
	}
	if ((style & SWT.CENTER) != 0) {
	OS.gtk_misc_set_alignment (labelHandle, 0.5f, 0.5f);
	OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_CENTER);
	OS.gtk_misc_set_alignment (pixmapHandle, 0.5f, 0.5f);
	return;
	}
	if ((style & SWT.RIGHT) != 0) {
	OS.gtk_misc_set_alignment (labelHandle, 1.0f, 0.5f);
	OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_RIGHT);
	OS.gtk_misc_set_alignment (pixmapHandle, 1.0f, 0.5f);
	return;
	}
	}

	void createWidget (int index) {
	super.createWidget (index);
	text = "";
	}

	void deregister () {
	super.deregister ();
	if (boxHandle != 0) WidgetTable.remove (boxHandle);
	if (labelHandle != 0) WidgetTable.remove (labelHandle);
	if (pixmapHandle != 0) WidgetTable.remove (pixmapHandle);
	if (arrowHandle != 0) WidgetTable.remove (arrowHandle);
	}

	int fontHandle () {
	if (labelHandle != 0) return labelHandle;
	return super.fontHandle ();
	}

	/**
	* 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 an <code>ARROW</code> button, in
	* which case, the alignment will indicate the direction of
	* the arrow (one of <code>LEFT</code>, <code>RIGHT</code>,
	* <code>UP</code> or <code>DOWN</code>).
	*
	* @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.ARROW) != 0) {
	if ((style & SWT.UP) != 0) return SWT.UP;
	if ((style & SWT.DOWN) != 0) return SWT.DOWN;
	if ((style & SWT.LEFT) != 0) return SWT.LEFT;
	if ((style & SWT.RIGHT) != 0) return SWT.RIGHT;
	return SWT.UP;
	}
	if ((style & SWT.LEFT) != 0) return SWT.LEFT;
	if ((style & SWT.CENTER) != 0) return SWT.CENTER;
	if ((style & SWT.RIGHT) != 0) 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 <code>true</code> if the receiver is selected,
	* and false otherwise.
	* <p>
	* When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
	* it is selected when it is checked. When it is of type <code>TOGGLE</code>,
	* it is selected when it is pushed in. If the receiver is of any other type,
	* this method returns false.
	*
	* @return the selection state
	*
	* @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 boolean getSelection () {
	checkWidget ();
	if ((style & (SWT.CHECK \| SWT.RADIO \| SWT.TOGGLE)) == 0) return false;
	return OS.gtk_toggle_button_get_active (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;
	}

	void hookEvents () {
	super.hookEvents();
	Display display = getDisplay ();
	int windowProc2 = display.windowProc2;
	OS.gtk_signal_connect (handle, OS.clicked, windowProc2, SWT.Selection);
	}

	int processFocusIn(int int0, int int1, int int2) {
	int result = super.processFocusIn (int0, int1, int2);
	// widget could be disposed at this point
	if (handle == 0) return 0;
	if ((style & SWT.PUSH) != 0 && OS.GTK_WIDGET_HAS_DEFAULT (handle)) {
	Decorations menuShell = menuShell ();
	menuShell.currentDefault = this;
	}
	return result;
	}

	int processFocusOut (int int0, int int1, int int2) {
	int result = super.processFocusOut (int0, int1, int2);
	// widget could be disposed at this point
	if (handle == 0) return 0;
	if ((style & SWT.PUSH) != 0 && !OS.GTK_WIDGET_HAS_DEFAULT (handle)) {
	Decorations menuShell = menuShell ();
	if (menuShell.currentDefault == this) {
	menuShell.currentDefault = null;
	}
	}
	return result;
	}

	int processSelection (int int0, int int1, int int2) {
	postEvent(SWT.Selection);
	return 0;
	}

	void register () {
	super.register ();
	if (boxHandle != 0) WidgetTable.put (boxHandle, this);
	if (labelHandle != 0) WidgetTable.put (labelHandle, this);
	if (pixmapHandle != 0) WidgetTable.put (pixmapHandle, this);
	if (arrowHandle != 0) WidgetTable.put (arrowHandle, this);
	}

	void releaseHandle () {
	super.releaseHandle ();
	boxHandle = pixmapHandle = labelHandle = arrowHandle = 0;
	}

	void releaseWidget () {
	super.releaseWidget ();
	image = 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 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);
	}

	/**
	* Controls how text, images and arrows will be displayed
	* in the receiver. The argument should be one of
	* <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>
	* unless the receiver is an <code>ARROW</code> button, in
	* which case, the argument indicates the direction of
	* the arrow (one of <code>LEFT</code>, <code>RIGHT</code>,
	* <code>UP</code> or <code>DOWN</code>).
	*
	* @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.ARROW) != 0) {
	if ((style & (SWT.UP \| SWT.DOWN \| SWT.LEFT \| SWT.RIGHT)) == 0) return;
	style &= ~(SWT.UP \| SWT.DOWN \| SWT.LEFT \| SWT.RIGHT);
	style \|= alignment & (SWT.UP \| SWT.DOWN \| SWT.LEFT \| SWT.RIGHT);
	int arrow_type = OS.GTK_ARROW_UP;
	switch (alignment) {
	case SWT.UP: arrow_type = OS.GTK_ARROW_UP; break;
	case SWT.DOWN: arrow_type = OS.GTK_ARROW_DOWN; break;
	case SWT.LEFT: arrow_type = OS.GTK_ARROW_LEFT; break;
	case SWT.RIGHT: arrow_type = OS.GTK_ARROW_RIGHT; break;
	}
	OS.gtk_arrow_set (arrowHandle, arrow_type, OS.GTK_SHADOW_OUT);
	return;
	}
	if ((alignment & (SWT.LEFT \| SWT.RIGHT \| SWT.CENTER)) == 0) return;
	style &= ~(SWT.LEFT \| SWT.RIGHT \| SWT.CENTER);
	style \|= alignment & (SWT.LEFT \| SWT.RIGHT \| SWT.CENTER);
	if ((style & SWT.LEFT) != 0) {
	OS.gtk_misc_set_alignment (labelHandle, 0.0f, 0.5f);
	OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_LEFT);
	OS.gtk_misc_set_alignment (pixmapHandle, 0.0f, 0.5f);
	return;
	}
	if ((style & SWT.CENTER) != 0) {
	OS.gtk_misc_set_alignment (labelHandle, 0.5f, 0.5f);
	OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_CENTER);
	OS.gtk_misc_set_alignment (pixmapHandle, 0.5f, 0.5f);
	return;
	}
	if ((style & SWT.RIGHT) != 0) {
	OS.gtk_misc_set_alignment (labelHandle, 1.0f, 0.5f);
	OS.gtk_label_set_justify (labelHandle, OS.GTK_JUSTIFY_RIGHT);
	OS.gtk_misc_set_alignment (pixmapHandle, 1.0f, 0.5f);
	return;
	}
	}

	void setBackgroundColor (GdkColor color) {
	super.setBackgroundColor (color);
	OS.gtk_widget_modify_bg (fixedHandle, 0, color);
	if (labelHandle != 0) OS.gtk_widget_modify_bg (labelHandle, 0, color);
	if (pixmapHandle != 0) OS.gtk_widget_modify_bg (pixmapHandle, 0, color);
	}

	void setFontDescription (int font) {
	super.setFontDescription (font);
	if (labelHandle != 0) OS.gtk_widget_modify_font (labelHandle, font);
	if (pixmapHandle != 0) OS.gtk_widget_modify_font (pixmapHandle, font);
	}

	void setForegroundColor (GdkColor color) {
	super.setForegroundColor (color);
	OS.gtk_widget_modify_fg (fixedHandle, 0, color);
	if (labelHandle != 0) OS.gtk_widget_modify_fg (labelHandle, 0, color);
	if (pixmapHandle != 0) OS.gtk_widget_modify_fg (pixmapHandle, 0, color);
	}

	/**
	* 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 ();
	Image oldImage = this.image;
	this.image = image;
	if ((style & SWT.ARROW) != 0) return;
	OS.gtk_widget_hide (labelHandle);
	if (image != null) {
	OS.gtk_pixmap_set (pixmapHandle, image.pixmap, image.mask);
	OS.gtk_widget_show (pixmapHandle);
	} else {
	Display display = getDisplay ();
	OS.gtk_pixmap_set (pixmapHandle, display.nullPixmap, 0);
	OS.gtk_widget_hide (pixmapHandle);
	}
	if (oldImage == image) OS.gtk_widget_queue_draw (pixmapHandle);
	}

	/**
	* Sets the selection state of the receiver, if it is of type <code>CHECK</code>,
	* <code>RADIO</code>, or <code>TOGGLE</code>.
	*
	* <p>
	* When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
	* it is selected when it is checked. When it is of type <code>TOGGLE</code>,
	* it is selected when it is pushed in.
	*
	* @param selected the new selection state
	*
	* @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 setSelection (boolean selected) {
	checkWidget();
	if ((style & (SWT.CHECK \| SWT.RADIO \| SWT.TOGGLE)) == 0) return;
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	OS.gtk_toggle_button_set_active (handle, selected);
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
	}

	/**
	* Sets the receiver's text.
	* <p>
	* This method sets the button label. The label may include
	* the mnemonic character but must not contain 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);
	text = string;
	if ((style & SWT.ARROW) != 0) return;
	char [] chars = fixMnemonic (string);
	byte [] buffer = Converter.wcsToMbcs (null, chars);
	OS.gtk_label_set_text_with_mnemonic (labelHandle, buffer);
	OS.gtk_widget_hide (pixmapHandle);
	if (string.length () != 0) {
	OS.gtk_widget_show (labelHandle);
	} else {
	OS.gtk_widget_hide (labelHandle);
	}
	}

	int traversalCode (int key, int event) {
	int code = super.traversalCode (key, event);
	if ((style & SWT.PUSH) != 0) return code;
	return code \| SWT.TRAVERSE_ARROW_NEXT \| SWT.TRAVERSE_ARROW_PREVIOUS;
	}

	}