Symbian3/PDK/Source/GUID-24039DCE-B5C4-46CB-9E02-AB421C64FB87.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
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Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-24039DCE-B5C4-46CB-9E02-AB421C64FB87" xml:lang="en"><title>Relationship
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between window controls</title><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>When a control draws in the window of another control, the position
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is relative to that window. If a control owns a window that is a child of
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another window, that control's position is relative to the parent window;
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however, if that control is a compound control, its child control's coordinates
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are relative to its own parent control window position. Top-level window-owning
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controls are displayed using a position relative to the display. In other
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words, it uses the physical coordinates of the display.</p>
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<p>The following figure illustrates this relationship.</p>
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<fig id="GUID-9D373EB7-096D-4C84-8060-577F33D462EE"><title>Relative positions of three controls where the top-level parent owns
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the window</title><image href="GUID-61C340D0-9058-45C2-9A90-4AB8E0612872_d0e70653_href.png"/></fig>
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<p>Consider three controls, <b>A</b>, <b>B</b>, and <b>C</b> (shown in
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the figure above):</p>
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<ul>
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<li><p><b>A</b> is a top-level control and owns a window</p>
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</li>
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<li><p>Child controls <b>B</b> and <b>C</b> do not create their
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own windows in this example.</p></li>
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<li><p><b>B</b>, a child control of <b>A</b>, does not create a
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window, and it has a child control, <b>C</b>. </p>
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<itemgroup>
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<p><b>B</b>'s window is set calling the <parmname>CCoeControl::SetContainerWindowL(A)</parmname> method
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and <b>C</b>'s window is set with <parmname>CCoeControl::SetContainerWindowL(B)</parmname>.
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Then <b>C</b>'s position (p) is relative to <b>A</b>, since it is the actual
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window owner. <b>A</b>'s position (m) is relative to the display position.</p>
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</itemgroup>
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</li>
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</ul>
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<p>However, if <b>B</b> is a child control of <b>A</b> but also has a window
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of its own, it is a child window of <b>A</b>'s window (as shown in the following
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figure). Then if <b>C</b> is a child of <b>B</b> and sets its window by calling <parmname>CCoeControl::SetContainerWindowL(B)</parmname>,
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the position of <b>C</b> (p') is relative to <b>B</b>'s window.</p>
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<fig id="GUID-5884BDB6-6ED0-4EF6-A64F-3EEAAAEE2FF0"><title>Relative positions of three controls where a child owns a window</title><image href="GUID-3A506E2A-2999-458B-BBA2-DCC4D2EA5492_d0e70756_href.png"/></fig>
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<p>As the example illustrates, a control position depends on the window
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in which it is drawn. Therefore, you need to know the drawing window for each
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control. It is an important issue when designing a UI layout. There are some
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common controls that optionally may have their own window, such as menus,
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dialogs, and scroll bars. The application framework handles drawing these
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controls, as long as the appropriate resources and flags have been set. The <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-8AF77599-1FE4-36C1-AED8-1FB8A053354F"><apiname>CCoeControl::OwnsWindow()</apiname></xref> call
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can be used to detect whether a control owns a window or not.</p>
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</conbody></concept>