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/*******************************************************************************
 * Copyright (c) 2000, 2012 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.cairo.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.graphics.*;

/**
 * Instances of this class are controls which are capable
 * of containing other controls.
 * 
 * Styles:
 * NO_BACKGROUND, NO_FOCUS, NO_MERGE_PAINTS, NO_REDRAW_RESIZE, NO_RADIO_GROUP, EMBEDDED, DOUBLE_BUFFERED
 * Events:
 * (none)
 * 
 * 
 * Note: The NO_BACKGROUND, NO_FOCUS, NO_MERGE_PAINTS,
 * and NO_REDRAW_RESIZE styles are intended for use with Canvas.
 * They can be used with Composite if you are drawing your own, but their
 * behavior is undefined if they are used with subclasses of Composite other
 * than Canvas.
 * 

 * Note: The CENTER style, although undefined for composites, has the
 * same value as EMBEDDED which is used to embed widgets from other
 * widget toolkits into SWT.  On some operating systems (GTK, Motif), this may cause
 * the children of this composite to be obscured.
 * 

 * This class may be subclassed by custom control implementors
 * who are building controls that are constructed from aggregates
 * of other controls.
 * 
 *
 * @see Canvas
 * @see Composite snippets
 * @see Sample code and further information
 */
public class Composite extends Scrollable {
	/**
	 * the handle to the OS resource 
	 * (Warning: This field is platform dependent)
	 * 
	 * IMPORTANT: This field is not part of the SWT
	 * public API. It is marked public only so that it can be shared
	 * within the packages provided by SWT. It is not available on all
	 * platforms and should never be accessed from application code.
	 * 
	 * 
	 * @noreference This field is not intended to be referenced by clients.
	 */
	public long /*int*/  embeddedHandle;
	long /*int*/ imHandle, socketHandle;
	Layout layout;
	Control[] tabList;
	int layoutCount, backgroundMode;

	static final String NO_INPUT_METHOD = "org.eclipse.swt.internal.gtk.noInputMethod"; //$NON-NLS-1$

Composite () {
	/* Do nothing */
}

/**
 * Constructs a new instance of this class given its parent
 * and a style value describing its behavior and appearance.
 * 
 * The style value is either one of the style constants defined in
 * class SWT which is applicable to instances of this
 * class, or must be built by bitwise OR'ing together 
 * (that is, using the int "|" operator) two or more
 * of those SWT style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * 
 *
 * @param parent a widget which will be the parent of the new instance (cannot be null)
 * @param style the style of widget to construct
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the parent is null
 * 
 * @exception SWTException 
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
 * 
 *
 * @see SWT#NO_BACKGROUND
 * @see SWT#NO_FOCUS
 * @see SWT#NO_MERGE_PAINTS
 * @see SWT#NO_REDRAW_RESIZE
 * @see SWT#NO_RADIO_GROUP
 * @see SWT#EMBEDDED
 * @see SWT#DOUBLE_BUFFERED
 * @see Widget#getStyle
 */
public Composite (Composite parent, int style) {
	super (parent, checkStyle (style));
}

static int checkStyle (int style) {
	if (OS.INIT_CAIRO) {
		style &= ~SWT.NO_BACKGROUND;
	}
	style &= ~SWT.TRANSPARENT;
	return style;
}

Control [] _getChildren () {
	long /*int*/ parentHandle = parentingHandle ();
	long /*int*/ list = OS.gtk_container_get_children (parentHandle);
	if (list == 0) return new Control [0];
	int count = OS.g_list_length (list);
	Control [] children = new Control [count];
	int i = 0;
	long /*int*/ temp = list;
	while (temp != 0) {
		long /*int*/ handle = OS.g_list_data (temp);
		if (handle != 0) {
			Widget widget = display.getWidget (handle);
			if (widget != null && widget != this) {
				if (widget instanceof Control) {
					children [i++] = (Control) widget;
				}
			}
		}
		temp = OS.g_list_next (temp);
	}
	OS.g_list_free (list);
	if (i == count) return children;
	Control [] newChildren = new Control [i];
	System.arraycopy (children, 0, newChildren, 0, i);
	return newChildren;
}

Control [] _getTabList () {
	if (tabList == null) return tabList;
	int count = 0;
	for (int i=0; i
 *    ERROR_INVALID_ARGUMENT - if the changed array is null any of its controls are null or have been disposed 
 *    ERROR_INVALID_PARENT - if any control in changed is not in the widget tree of the receiver
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @since 3.1
 */
public void changed (Control[] changed) {
	checkWidget ();
	if (changed == null) error (SWT.ERROR_INVALID_ARGUMENT);
	for (int i=0; iThe offsetX and offsetY are used to map from
 * the gc origin to the origin of the parent image background. This is useful
 * to ensure proper alignment of the image background.
 * 
 * @param gc the gc where the rectangle is to be filled
 * @param x the x coordinate of the rectangle to be filled
 * @param y the y coordinate of the rectangle to be filled
 * @param width the width of the rectangle to be filled
 * @param height the height of the rectangle to be filled
 * @param offsetX the image background x offset 
 * @param offsetY the image background y offset
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the gc is null
 *    ERROR_INVALID_ARGUMENT - if the gc has been disposed
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * 
 * @since 3.6
 */
public void drawBackground (GC gc, int x, int y, int width, int height, int offsetX, int offsetY) {
	checkWidget ();
	if (gc == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (gc.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
	Control control = findBackgroundControl ();
	if (control != null) {
		GCData data = gc.getGCData ();
		long /*int*/ cairo = data.cairo;
		if (cairo != 0) {
			Cairo.cairo_save (cairo);
			if (control.backgroundImage != null) {
				Point pt = display.map (this, control, 0, 0);
				Cairo.cairo_translate (cairo, -pt.x - offsetX, -pt.y - offsetY);
				x += pt.x + offsetX;
				y += pt.y + offsetY;
				long /*int*/ surface = control.backgroundImage.surface;
				if (surface == 0) {
					long /*int*/ xDisplay = OS.gdk_x11_display_get_xdisplay(OS.gdk_display_get_default());
					long /*int*/ xVisual = OS.gdk_x11_visual_get_xvisual (OS.gdk_visual_get_system());
					long /*int*/ drawable = control.backgroundImage.pixmap;
					long /*int*/ xDrawable = OS.GDK_PIXMAP_XID (drawable);				
					int [] w = new int [1], h = new int [1];
					gdk_pixmap_get_size (drawable, w, h);
					surface = Cairo.cairo_xlib_surface_create (xDisplay, xDrawable, xVisual, w [0], h [0]);
					if (surface == 0) error (SWT.ERROR_NO_HANDLES);
				} else {
					Cairo.cairo_surface_reference(surface);
				}
				long /*int*/ pattern = Cairo.cairo_pattern_create_for_surface (surface);
				if (pattern == 0) error (SWT.ERROR_NO_HANDLES);
				Cairo.cairo_pattern_set_extend (pattern, Cairo.CAIRO_EXTEND_REPEAT);
				if ((data.style & SWT.MIRRORED) != 0) {
					double[] matrix = {-1, 0, 0, 1, 0, 0};
					Cairo.cairo_pattern_set_matrix(pattern, matrix);
				}
				Cairo.cairo_set_source (cairo, pattern);
				Cairo.cairo_surface_destroy (surface);
				Cairo.cairo_pattern_destroy (pattern);
			} else {
				GdkColor color = control.getBackgroundColor ();
				Cairo.cairo_set_source_rgba (cairo, (color.red & 0xFFFF) / (float)0xFFFF, (color.green & 0xFFFF) / (float)0xFFFF, (color.blue & 0xFFFF) / (float)0xFFFF, data.alpha / (float)0xFF);
			}			
			Cairo.cairo_rectangle (cairo, x, y, width, height);
			Cairo.cairo_fill (cairo);
			Cairo.cairo_restore (cairo);
		} else {
			long /*int*/ gdkGC = gc.handle;
			GdkGCValues values = new GdkGCValues ();
			OS.gdk_gc_get_values (gdkGC, values);
			if (control.backgroundImage != null) {
				Point pt = display.map (this, control, 0, 0);
				OS.gdk_gc_set_fill (gdkGC, OS.GDK_TILED);
				OS.gdk_gc_set_ts_origin (gdkGC, -pt.x - offsetX, -pt.y - offsetY);
				OS.gdk_gc_set_tile (gdkGC, control.backgroundImage.pixmap);
				OS.gdk_draw_rectangle (data.drawable, gdkGC, 1, x, y, width, height);
				OS.gdk_gc_set_fill (gdkGC, values.fill);
				OS.gdk_gc_set_ts_origin (gdkGC, values.ts_x_origin, values.ts_y_origin);
			} else {
				GdkColor color = control.getBackgroundColor ();
				OS.gdk_gc_set_foreground (gdkGC, color);
				OS.gdk_draw_rectangle (data.drawable, gdkGC, 1, x, y, width, height);
				color.pixel = values.foreground_pixel;
				OS.gdk_gc_set_foreground (gdkGC, color);
			}
		}
	} else {
		gc.fillRectangle (x, y, width, height);
	}
}

void enableWidget (boolean enabled) {
	if ((state & CANVAS) != 0) return;
	super.enableWidget (enabled);
}

Composite findDeferredControl () {
	return layoutCount > 0 ? this : parent.findDeferredControl ();
}

Menu [] findMenus (Control control) {
	if (control == this) return new Menu [0];
	Menu result [] = super.findMenus (control);
	Control [] children = _getChildren ();
	for (int i=0; iSWT:
 * INHERIT_NONE, INHERIT_DEFAULT,
 * INHERIT_FORCE.
 *
 * @return the background mode
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @see SWT
 * 
 * @since 3.2
 */
public int getBackgroundMode () {
	checkWidget ();
	return backgroundMode;
}

/**
 * Returns a (possibly empty) array containing the receiver's children.
 * Children are returned in the order that they are drawn.  The topmost
 * control appears at the beginning of the array.  Subsequent controls
 * draw beneath this control and appear later in the array.
 * 
 * Note: This is not the actual structure used by the receiver
 * to maintain its list of children, so modifying the array will
 * not affect the receiver. 
 * 
 *
 * @return an array of children
 * 
 * @see Control#moveAbove
 * @see Control#moveBelow
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public Control [] getChildren () {
	checkWidget();
	return _getChildren ();
}

int getChildrenCount () {
	/*
	* NOTE: The current implementation will count
	* non-registered children.
	*/
	long /*int*/ list = OS.gtk_container_get_children (handle);
	if (list == 0) return 0;
	int count = OS.g_list_length (list);
	OS.g_list_free (list);
	return count;
}

public Rectangle getClientArea () {
	checkWidget();
	if ((state & CANVAS) != 0) {
		if ((state & ZERO_WIDTH) != 0 && (state & ZERO_HEIGHT) != 0) {
			return new Rectangle (0, 0, 0, 0);
		}
		forceResize ();
		long /*int*/ clientHandle = clientHandle ();
		GtkAllocation allocation = new GtkAllocation();
		gtk_widget_get_allocation (clientHandle, allocation);
		int width = (state & ZERO_WIDTH) != 0 ? 0 : allocation.width;
		int height = (state & ZERO_HEIGHT) != 0 ? 0 : allocation.height;
		return new Rectangle (0, 0, width, height);
	}
	return super.getClientArea();
}

int getClientWidth() {
	if ((state & ZERO_WIDTH) != 0) return 0;
	GtkAllocation allocation = new GtkAllocation();
	gtk_widget_get_allocation(clientHandle (), allocation);
	return allocation.width;
}

/**
 * Returns layout which is associated with the receiver, or
 * null if one has not been set.
 *
 * @return the receiver's layout or null
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public Layout getLayout () {
	checkWidget();
	return layout;
}

/**
 * Returns true if the receiver has deferred
 * the performing of layout, and false otherwise.
 *
 * @return the receiver's deferred layout state
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * 
 * @see #setLayoutDeferred(boolean)
 * @see #isLayoutDeferred()
 *
 * @since 3.1
 */
public boolean getLayoutDeferred () {
	checkWidget ();
	return layoutCount > 0 ;
}

/**
 * Gets the (possibly empty) tabbing order for the control.
 *
 * @return tabList the ordered list of controls representing the tab order
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * 
 * @see #setTabList
 */
public Control [] getTabList () {
	checkWidget ();
	Control [] tabList = _getTabList ();
	if (tabList == null) {
		int count = 0;
		Control [] list =_getChildren ();
		for (int i=0; itrue if the receiver or any ancestor 
 * up to and including the receiver's nearest ancestor shell
 * has deferred the performing of layouts.  Otherwise, false
 * is returned.
 *
 * @return the receiver's deferred layout state
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * 
 * @see #setLayoutDeferred(boolean)
 * @see #getLayoutDeferred()
 * 
 * @since 3.1
 */
public boolean isLayoutDeferred () {
	checkWidget ();
	return findDeferredControl () != null;
}

boolean isTabGroup() {
	if ((state & CANVAS) != 0) return true;
	return super.isTabGroup();
}

/**
 * If the receiver has a layout, asks the layout to lay out
 * (that is, set the size and location of) the receiver's children. 
 * If the receiver does not have a layout, do nothing.
 * 
 * This is equivalent to calling layout(true).
 * 
 * 
 * Note: Layout is different from painting. If a child is
 * moved or resized such that an area in the parent is
 * exposed, then the parent will paint. If no child is
 * affected, the parent will not paint.
 * 
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public void layout () {
	checkWidget ();
	layout (true);
}

/**
 * If the receiver has a layout, asks the layout to lay out
 * (that is, set the size and location of) the receiver's children. 
 * If the argument is true the layout must not rely
 * on any information it has cached about the immediate children. If it
 * is false the layout may (potentially) optimize the
 * work it is doing by assuming that none of the receiver's 
 * children has changed state since the last layout.
 * If the receiver does not have a layout, do nothing.
 * 
 * If a child is resized as a result of a call to layout, the 
 * resize event will invoke the layout of the child.  The layout
 * will cascade down through all child widgets in the receiver's widget 
 * tree until a child is encountered that does not resize.  Note that 
 * a layout due to a resize will not flush any cached information 
 * (same as layout(false)).
 * 
 * 
 * Note: Layout is different from painting. If a child is
 * moved or resized such that an area in the parent is
 * exposed, then the parent will paint. If no child is
 * affected, the parent will not paint.
 * 
 *
 * @param changed true if the layout must flush its caches, and false otherwise
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public void layout (boolean changed) {
	checkWidget ();
	if (layout == null) return;
	layout (changed, false);
}

/**
 * If the receiver has a layout, asks the layout to lay out
 * (that is, set the size and location of) the receiver's children. 
 * If the changed argument is true the layout must not rely
 * on any information it has cached about its children. If it
 * is false the layout may (potentially) optimize the
 * work it is doing by assuming that none of the receiver's 
 * children has changed state since the last layout.
 * If the all argument is true the layout will cascade down
 * through all child widgets in the receiver's widget tree, regardless of
 * whether the child has changed size.  The changed argument is applied to 
 * all layouts.  If the all argument is false, the layout will
 * not cascade down through all child widgets in the receiver's widget 
 * tree.  However, if a child is resized as a result of a call to layout, the 
 * resize event will invoke the layout of the child.  Note that 
 * a layout due to a resize will not flush any cached information 
 * (same as layout(false)).
 * 
 * 
 * Note: Layout is different from painting. If a child is
 * moved or resized such that an area in the parent is
 * exposed, then the parent will paint. If no child is
 * affected, the parent will not paint.
 * 
 *
 * @param changed true if the layout must flush its caches, and false otherwise
 * @param all true if all children in the receiver's widget tree should be laid out, and false otherwise
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @since 3.1
 */
public void layout (boolean changed, boolean all) {
	checkWidget ();
	if (layout == null && !all) return;
	markLayout (changed, all);
	updateLayout (all);
}

/**
 * Forces a lay out (that is, sets the size and location) of all widgets that 
 * are in the parent hierarchy of the changed control up to and including the 
 * receiver.  The layouts in the hierarchy must not rely on any information 
 * cached about the changed control or any of its ancestors.  The layout may 
 * (potentially) optimize the work it is doing by assuming that none of the 
 * peers of the changed control have changed state since the last layout.
 * If an ancestor does not have a layout, skip it.
 * 
 * Note: Layout is different from painting. If a child is
 * moved or resized such that an area in the parent is
 * exposed, then the parent will paint. If no child is
 * affected, the parent will not paint.
 * 
 * 
 * @param changed a control that has had a state change which requires a recalculation of its size
 * 
 * @exception IllegalArgumentException 
 *    ERROR_INVALID_ARGUMENT - if the changed array is null any of its controls are null or have been disposed 
 *    ERROR_INVALID_PARENT - if any control in changed is not in the widget tree of the receiver
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @since 3.1
 */
public void layout (Control [] changed) {
	checkWidget ();
	if (changed == null) error (SWT.ERROR_INVALID_ARGUMENT);
	layout (changed, SWT.NONE);
}

/**
 * Forces a lay out (that is, sets the size and location) of all widgets that 
 * are in the parent hierarchy of the changed control up to and including the 
 * receiver. 
 * 
 * The parameter flags may be a combination of:
 * 

 * SWT.ALL
 * all children in the receiver's widget tree should be laid out
 * SWT.CHANGED
 * the layout must flush its caches
 * SWT.DEFER
 * layout will be deferred
 * 
 * 
 * 
 * When the changed array is specified, the flags SWT.ALL
 * and SWT.CHANGED have no effect. In this case, the layouts in the 
 * hierarchy must not rely on any information cached about the changed control or
 * any of its ancestors.  The layout may (potentially) optimize the
 * work it is doing by assuming that none of the peers of the changed
 * control have changed state since the last layout.
 * If an ancestor does not have a layout, skip it.
 * 
 * 
 * When the changed array is not specified, the flag SWT.ALL
 * indicates that the whole widget tree should be laid out. And the flag
 * SWT.CHANGED indicates that the layouts should flush any cached
 * information for all controls that are laid out. 
 * 
 * 
 * The SWT.DEFER flag always causes the layout to be deferred by
 * calling Composite.setLayoutDeferred(true) and scheduling a call
 * to Composite.setLayoutDeferred(false), which will happen when
 * appropriate (usually before the next event is handled). When this flag is set,
 * the application should not call Composite.setLayoutDeferred(boolean).
 * 
 * 
 * Note: Layout is different from painting. If a child is
 * moved or resized such that an area in the parent is
 * exposed, then the parent will paint. If no child is
 * affected, the parent will not paint.
 * 
 * 
 * @param changed a control that has had a state change which requires a recalculation of its size
 * @param flags the flags specifying how the layout should happen
 * 
 * @exception IllegalArgumentException 
 *    ERROR_INVALID_ARGUMENT - if any of the controls in changed is null or has been disposed 
 *    ERROR_INVALID_PARENT - if any control in changed is not in the widget tree of the receiver
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @since 3.6
 */
public void layout (Control [] changed, int flags) {
	checkWidget ();
	if (changed != null) {
		for (int i=0; i=0; i--) {
			update [i].updateLayout (false);
		}
	} else {
		if (layout == null && (flags & SWT.ALL) == 0) return;
		markLayout ((flags & SWT.CHANGED) != 0, (flags & SWT.ALL) != 0);
		if ((flags & SWT.DEFER) != 0) {
			setLayoutDeferred (true);
			display.addLayoutDeferred (this);
		}
		updateLayout ((flags & SWT.ALL) != 0);
	}
}

void markLayout (boolean changed, boolean all) {
	if (layout != null) {
		state |= LAYOUT_NEEDED;
		if (changed) state |= LAYOUT_CHANGED;
	}
	if (all) {
		Control [] children = _getChildren ();
		for (int i=0; i 0) x = oldWidth - controlWidth - x; 
		int clientWidth = getClientWidth ();
		x = clientWidth - controlWidth - x;
		if (child.enableWindow != 0) {
			OS.gdk_window_move (child.enableWindow, x, y);
		}
		child.moveHandle (x, y);
		/*
		* Cause a size allocation this widget's topHandle.  Note that
		* all calls to gtk_widget_size_allocate() must be preceded by
		* a call to gtk_widget_size_request().
		*/
		GtkRequisition requisition = new GtkRequisition ();
		gtk_widget_size_request (topHandle, requisition);
		allocation.x = x;
		allocation.y = y;
		OS.gtk_widget_size_allocate (topHandle, allocation);
		Control control = child.findBackgroundControl ();
		if (control != null && control.backgroundImage != null) {
			if (child.isVisible ()) child.redrawWidget (0, 0, 0, 0, true, true, true);
		}
	}
}

Point minimumSize (int wHint, int hHint, boolean changed) {
	Control [] children = _getChildren ();
	Rectangle clientArea = getClientArea ();
	int width = 0, height = 0;
	for (int i=0; i=0; --i) {
		Control child = children [i];
		if (child.getVisible ()) {
			Point location = child.getLocation ();
			child.printWidget (gc, drawable, depth, x + location.x, y + location.y);
		}
	}
	gc.setClipping (oldClip);
	oldClip.dispose ();
	newClip.dispose ();
}

void redrawChildren () {
	super.redrawChildren ();
	Control [] children = _getChildren ();
	for (int i = 0; i < children.length; i++) {
		Control child = children [i];
		if ((child.state & PARENT_BACKGROUND) != 0) {
			child.redrawWidget (0, 0, 0, 0, true, false, true);
			child.redrawChildren ();
		}
	}
}

void register () {
	super.register ();
	if (socketHandle != 0) display.addWidget (socketHandle, this);
}

void releaseChildren (boolean destroy) {
	Control [] children = _getChildren ();
	for (int i=0; iSWT:
 * INHERIT_NONE, INHERIT_DEFAULT,
 * INHERIT_FORCE.
 *
 * @param mode the new background mode
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @see SWT
 * 
 * @since 3.2
 */
public void setBackgroundMode (int mode) {
	checkWidget ();
	backgroundMode = mode;
	Control[] children = _getChildren ();
	for (int i = 0; i < children.length; i++) {
		children [i].updateBackgroundMode ();
	}
}

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 != null) {
		markLayout (false, false);
		updateLayout (false);
	}
	return result;
}

public boolean setFocus () {
	checkWidget();
	Control [] children = _getChildren ();
	for (int i=0; i
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public void setLayout (Layout layout) {
	checkWidget();
	this.layout = layout;
}

/**
 * If the argument is true, causes subsequent layout
 * operations in the receiver or any of its children to be ignored.
 * No layout of any kind can occur in the receiver or any of its
 * children until the flag is set to false.
 * Layout operations that occurred while the flag was
 * true are remembered and when the flag is set to 
 * false, the layout operations are performed in an
 * optimized manner.  Nested calls to this method are stacked.
 *
 * @param defer the new defer state
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * 
 * @see #layout(boolean)
 * @see #layout(Control[])
 *
 * @since 3.1
 */
public void setLayoutDeferred (boolean defer) {
	checkWidget();
	if (!defer) {
		if (--layoutCount == 0) {
			if ((state & LAYOUT_CHILD) != 0 || (state & LAYOUT_NEEDED) != 0) {
				updateLayout (true);
			}
		}
	} else {
		layoutCount++;
	}
}

void setOrientation (boolean create) {
	super.setOrientation (create);
	if (!create) {
		int flags = SWT.RIGHT_TO_LEFT | SWT.LEFT_TO_RIGHT;
		int orientation = style & flags;	
		Control [] children = _getChildren ();
		for (int i=0; i
 *    ERROR_INVALID_ARGUMENT - if a widget in the tabList is null or has been disposed 
 *    ERROR_INVALID_PARENT - if widget in the tabList is not in the same widget tree
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public void setTabList (Control [] tabList) {
	checkWidget ();
	if (tabList != null) {
		for (int i=0; i