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/*******************************************************************************
* Copyright (c) 2000, 2009 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.photon.*;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
/**
* Instances of this class provide an etched border
* with an optional title.
* <p>
* Shadow styles are hints and may not be honoured
* by the platform. To create a group with the
* default shadow style for the platform, do not
* specify a shadow style.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>SHADOW_ETCHED_IN, SHADOW_ETCHED_OUT, SHADOW_IN, SHADOW_OUT, SHADOW_NONE</dd>
* <dt><b>Events:</b></dt>
* <dd>(none)</dd>
* </dl>
* <p>
* Note: Only one of the above styles 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/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 Group extends Composite {
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#SHADOW_ETCHED_IN
* @see SWT#SHADOW_ETCHED_OUT
* @see SWT#SHADOW_IN
* @see SWT#SHADOW_OUT
* @see SWT#SHADOW_NONE
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Group (Composite parent, int style) {
super (parent, checkStyle (style));
}
static int checkStyle (int style) {
style |= SWT.NO_FOCUS;
/*
* Even though it is legal to create this widget
* with scroll bars, they serve no useful purpose
* because they do not automatically scroll the
* widget's client area. The fix is to clear
* the SWT style.
*/
return style & ~(SWT.H_SCROLL | SWT.V_SCROLL);
}
public Point computeSize (int wHint, int hHint, boolean changed) {
checkWidget();
Point titleSize = getTitleSize();
Point size;
if (layout != null) {
changed |= (state & LAYOUT_CHANGED) != 0;
size = layout.computeSize (this, wHint, hHint, changed);
state &= ~LAYOUT_CHANGED;
} else {
size = minimumSize ();
}
int width = size.x; int height = size.y;
if (width == 0) width = DEFAULT_WIDTH;
if (height == 0) height = DEFAULT_HEIGHT;
if (wHint != SWT.DEFAULT) width = wHint;
if (hHint != SWT.DEFAULT) height = hHint;
Rectangle trim = computeTrim (0, 0, width, height);
width = Math.max (trim.width, titleSize.x + 6);
height = trim.height + titleSize.y;
return new Point (width, height);
}
protected void checkSubclass () {
if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS);
}
void createHandle (int index) {
state |= HANDLE;
int clazz = display.PtContainer;
int parentHandle = parent.parentingHandle ();
int [] args = {
OS.Pt_ARG_RESIZE_FLAGS, 0, OS.Pt_RESIZE_XY_BITS,
};
handle = OS.PtCreateWidget (clazz, parentHandle, args.length / 3, args);
if (handle == 0) error (SWT.ERROR_NO_HANDLES);
}
byte [] defaultFont () {
return display.GROUP_FONT;
}
/**
* Returns the receiver's text, which is the string that the
* is used as the <em>title</em>. If the text has not previously
* been set, returns an empty string.
*
* @return the 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;
}
Point getTitleSize() {
int width = 0, height = 0;
int [] args = {
OS.Pt_ARG_TITLE, 0, 0,
OS.Pt_ARG_TITLE_FONT, 0, 0,
OS.Pt_ARG_CONTAINER_FLAGS, 0, 0,
};
OS.PtGetResources (handle, args.length / 3, args);
if ((OS.Pt_ARG_CONTAINER_FLAGS & OS.Pt_SHOW_TITLE) != 0) {
PhRect_t rect = new PhRect_t();
int str = args [1];
if (str != 0) {
int length = OS.strlen (str);
if (length > 0) {
OS.PfExtentText(rect, null, args [4], str, length);
}
}
int inset = 4;
width = inset + rect.lr_x - rect.ul_x + 1;
height = inset + rect.lr_y - rect.ul_y + 1;
}
return new Point(width, height);
}
/**
* Sets the receiver's text, which is the string that will
* be displayed as the receiver's <em>title</em>, to the argument,
* which may not be null. The string may include the mnemonic character.
* </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 first child of the group. 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);
text = string;
int flags = OS.Pt_SHOW_TITLE | OS.Pt_ETCH_TITLE_AREA;
char [] text = new char [string.length ()];
string.getChars (0, text.length, text, 0);
fixMnemonic (text);
byte [] buffer = Converter.wcsToMbcs (null, text, true);
int ptr = OS.malloc (buffer.length);
OS.memmove (ptr, buffer, buffer.length);
int [] args = {
OS.Pt_ARG_TITLE, ptr, 0,
OS.Pt_ARG_CONTAINER_FLAGS, string.length () == 0 ? 0 : flags, flags,
};
OS.PtSetResources (handle, args.length / 3, args);
OS.free (ptr);
}
int widgetClass () {
return OS.PtContainer ();
}
}
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