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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-57CA8A13-05C6-4AFE-9804-E2EA2453143A" xml:lang="en"><title>Compound
+controls in the view architecture</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p><xref href="GUID-352850A9-227F-45DB-8DCD-C6268954B4ED.dita">Compound controls</xref> are
+controls that contain other controls. To create a compound control, you must
+do the following:</p>
+<ul>
+<li><p>construct the control in the parent control, which is the
+control that owns the window in which the control appears. The control should
+be constructed in the constructor for the window. An example of an implementation
+is as follows:</p>
+<itemgroup>
+<codeblock id="GUID-87D5DA2C-DF12-40CA-8F39-CA9B61500F8F" xml:space="preserve">void CMyViewContainer::ConstructL(const TRect&amp; aRect)
+    {
+    CreateWindowL();
+
+    iLabel = new (ELeave) CEikLabel;
+    iLabel-&gt;SetContainerWindowL( *this );
+    iLabel-&gt;SetTextL( _L("MyView 1\n\nSelect local view\nswitching from menu") );
+
+    SetRect(aRect);
+    ActivateL();
+    }</codeblock>
+<p>, where</p>
+<p><parmname>iLabel = new (ELeave) CEikLabel;</parmname> creates a <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCEikLabel.html" format="application/java-archive"><parmname>CEikLabel</parmname></xref> object,
+which is a class that supports the display of text in the parent window.</p>
+<p><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aSetContainerWindowL%28const%20CCoeControl%20%26amp%3b%29" format="application/java-archive"><parmname>CCoeControl::SetContainerWindowL</parmname></xref> assigns
+the non-window-owning control to the window-owning control</p>
+<p><xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCEikLabel.html#bcf1d51ebf4177465387f76584078f0c" format="application/java-archive"><parmname>CEikLabel::SetTextL</parmname></xref> sets a text for the label.</p>
+<p>The other methods are the standard methods for creating a window for
+the window-owning control.</p>
+</itemgroup>
+</li>
+<li><p>add a method to the owning control that returns the number
+of controls in the compound control. An example of an implementation is as
+follows:</p>
+<itemgroup>
+<codeblock id="GUID-048B5DCE-124A-4530-89AD-842DCA2F3FFC" xml:space="preserve">TInt CMyViewAppContainer::CountComponentControls() const
+    {
+    return KNumberOfControls; // return nbr of controls inside this compound control
+    }</codeblock>
+<p>, where</p>
+<p><parmname>CMyViewAppContainer::CountComponentControls()</parmname> overrides <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aCountComponentControls%28%29const" format="application/java-archive"><parmname>CCoeControl::CountComponentControls</parmname></xref> to
+return the number of controls in the compound control.</p>
+<p><parmname>KNumberOfControls</parmname> is a <parmname>TInt</parmname> constant
+for the number of controls in the application. Other approaches could be used.</p>
+</itemgroup>
+</li>
+<li><p>Add a method to the owning control that returns each of the
+controls by a zero-based index. An example of an implementation is as follows:</p>
+<itemgroup>
+<codeblock id="GUID-3A8A5312-117E-466F-A5BC-6B7AF0A75B9C" xml:space="preserve">CCoeControl* CContainerContainer::ComponentControl(
+    TInt aIndex)  const
+    {
+        switch ( aIndex )
+        {
+        case 0:
+            return iLabel; // return a pointer to the 
+                             //iLabel
+        default:
+            return NULL;
+        }
+    }
+</codeblock>
+<p>, where</p>
+<p><parmname>CCoeControl* CContainerContainer::ComponentControl(TInt aIndex)</parmname> gets
+an indexed component of a compound control.  There are 2 ways to implement
+a compound control. One way is to override this function. The other way is
+to use the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlArrayClass.html#_top%20title=" format="application/java-archive"><parmname>CCoeControlArray</parmname></xref> functionality (see the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aInitComponentArrayL%28%29" format="application/java-archive"><parmname>CCoeControl::InitComponentArrayL</parmname></xref> method).
+ Note: within a compound control, each component control is identified by
+an index, where the index depends on the order the controls were added: the
+first is given an index of <parmname>0</parmname>, the next an index of <parmname>1</parmname>,
+and so on. </p>
+<p>All child controls should be accessible by <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aComponentControl%28TInt%29const" format="application/java-archive"><parmname>CCoeControl::ComponentControl</parmname></xref> at any time, regardless
+of whether they are visible or not. The visibility of a control should be
+adjusted using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aMakeVisible%28TBool%29" format="application/java-archive"><parmname>CCoeControl::MakeVisible</parmname></xref> method.</p>
+</itemgroup>
+</li>
+</ul>
+<p><parmname>CCoeControl* CContainerContainer::ComponentControl(TInt aIndex)</parmname> and <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aCountComponentControls%28%29const" format="application/java-archive"><parmname>CCoeControl::CountComponentControls</parmname></xref> work
+in conjunction with each other. The Symbian platform can query the control
+as to how many components it has and then request a pointer to each of the
+component's controls. Controls can be added or removed at run time using these
+two methods. The framework uses this information to draw the container. </p>
+<p>The compound control usually owns the child controls and therefore it
+is responsible of their construction and destruction. The compound control
+should also set the positions and sizes of its child controls; it must ensure
+that all child controls are inside the compound control rectangle and visible
+child rectangles do not overlap each other.</p>
+</conbody></concept>
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