author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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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-A3BCC33F-D11B-4F98-BCC3-9A06381A02E7" xml:lang="en"><title>Constructing |
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the view controller in the view architecture</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>Each view controller acts like a small UI controller.</p> |
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<p>The call on the first phase constructor of the view controller occurs |
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in the<xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita"> UI controller</xref>.</p> |
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<p>The methods you need to implement in your <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html" format="application/java-archive"><parmname>CAknView</parmname></xref>-derived |
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class are as follows:</p> |
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<ul> |
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<li><p>C++ default constructor, which cannot contain any code that |
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might leave. A common implementation is:</p> |
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<itemgroup> |
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<codeblock id="GUID-CA1A42F0-2B6F-4520-B408-1B46037B6E29" xml:space="preserve"> |
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CMyViewAppView::CMyViewAppView() |
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{ |
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}</codeblock> |
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<p>The class declaration for this constructor in the class header file |
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needs to be public to support the construction method required.</p> |
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</itemgroup> |
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</li> |
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<li><p>two-phase constructor, a common implementation is:</p> |
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<itemgroup> |
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<codeblock id="GUID-A98C61E4-8C11-4F7D-9782-C440B8FAE374" xml:space="preserve">CMyViewAppView* CMyViewAppView::NewL( const TRect& aRect ) |
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{ |
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CMyViewAppView* self = CMyViewAppView::NewLC( aRect ); |
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CleanupStack::Pop( self ); |
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return self; |
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} |
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|
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CMyViewAppView* CMyViewAppView::NewLC( const TRect& aRect ) |
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{ |
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CMyViewAppView* self = new ( ELeave ) CMyViewAppView; |
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CleanupStack::PushL( self ); |
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self->ConstructL( aRect ); |
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return self; |
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} |
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</codeblock> |
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<p>The declarations for <parmname>CMyViewAppView::NewL</parmname> and <parmname>CMyViewAppView::NewLC</parmname> in |
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the class header file needs to be public to support the construction method |
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required. </p> |
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<p>In this approach, <parmname>CMyViewAppView::NewL</parmname> is called |
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from the UI controller. It creates a view object by calling <parmname>CMyViewAppView::NewLC</parmname>. <parmname>CMyViewAppView::NewLC</parmname> calls new (<parmname>ELeave</parmname>) on the C++ default constructor <parmname>CMyViewAppView</parmname> to |
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create the object (and leave if it cannot), <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Kernel_Architecture_2/CCleanupClass.html#%3a%3aCCleanup%3a%3aPushL%28CBase%20%2a%29" format="application/java-archive">pushes</xref> a pointer to the clean-up stack in case the second phase construction method |
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leaves, and then calls the second phase construction method of the object. |
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When it returns to <parmname>CMyViewAppView::NewL</parmname>, the pointer |
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pushed to the cleanup stack is <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Kernel_Architecture_2/CCleanupClass.html#%3a%3aCCleanup%3a%3aPop%28%29" format="application/java-archive">removed</xref>.</p> |
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</itemgroup> |
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</li> |
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<li><p>Symbian 2nd phase constructor with code that might leave. |
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A common implementation is:</p> |
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<itemgroup> |
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<codeblock id="GUID-F282B41C-0AF0-4B62-853A-812F34667C78" xml:space="preserve">void CMyViewAppView::ConstructL() |
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{ |
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// construct r_name32 resources |
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BaseConstructL(r_name32 ); |
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} |
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</codeblock> |
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<p><parmname>CMyViewAppView::ConstructL</parmname> is a public class providing |
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the second phase construction that accepts the rectangle the view is drawn |
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to.</p> |
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<p><xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html#04bb841d875636d632ada39cb12514c4" format="application/java-archive"><parmname>CAknView::BaseConstructL</parmname></xref> initializes this view with standard values. It accepts the |
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symbolic ID name of a resource from the resource file.</p> |
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</itemgroup> |
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</li> |
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<li><p>a method for returning the UID for the view. A common implementation |
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is:</p> |
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<itemgroup> |
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<codeblock id="GUID-272134EE-D14C-4F97-A46D-0BEC71EF01ED" xml:space="preserve"> |
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TUid CMyViewAppView::Id() const |
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{ |
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return KViewId; |
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} |
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|
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</codeblock> |
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<p><parmname>CMyViewAppView::Id()</parmname> is the override of <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html#71e3a172cd418a5d73071f598fe8d26d" format="application/java-archive"><parmname>CAknView::ID</parmname></xref> to return the UID of the view</p> |
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<p><parmname>KViewId</parmname> is defined somewhere in a header file, |
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and is unique to this application</p> |
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</itemgroup> |
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</li> |
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</ul> |
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<section id="GUID-952D9762-EA63-489D-9698-FC504BD73001"><title>Scalability</title> |
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<p>If you wish to support <xref href="GUID-B02C762B-C452-4184-ABEA-4753E6CD47D2.dita">scalability</xref> in |
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your application, then you need to implement <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/UIKON/CEikAppUiClass.html#%3a%3aCEikAppUi%3a%3aHandleResourceChangeL%28%29" format="application/java-archive"><parmname>CEikAppUi::HandleResourceChangeL</parmname></xref> in the <xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita"> UI |
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controller</xref>, and then a <parmname>HandleClientRectChange</parmname> method |
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in the view controller.</p> |
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<p>A common implementation is as follows:</p> |
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<codeblock id="GUID-F5BC393D-EA47-45B2-8892-B71CE934F5B6" xml:space="preserve"> |
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void CMyViewAppView::HandleClientRectChange() |
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{ |
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if ( iContainer ) |
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{ |
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iContainer->SetRect( ClientRect() ); |
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} |
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} |
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</codeblock> |
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<p>, where</p> |
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<p><parmname>CMyViewAppView::HandleClientRectChange</parmname> calls <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aSetRect%28const%20TRect%20%26amp%3b%29" format="application/java-archive"><parmname>CCoeControl::SetRect(aRect)</parmname></xref> to set the |
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window size according to the requirements of the mobile device.</p> |
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</section> |
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<section id="GUID-DC760F92-C154-4DAA-AAD1-A0C02766C6B0"><title>Activating and |
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deactivating views</title> |
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<p>In order for a view to be displayed, it needs to be activated by <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html#486d490d911ce5e9495e0ee19b0442db" format="application/java-archive"><parmname>CAknView::DoActivateL</parmname></xref>. The override of this method in the view controller must create |
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a <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived view to display visual |
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content to mobile device users. The <parmname>DoActivateL()</parmname> call |
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must be prepared to handle the case where it is called while the view is already |
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active.</p> |
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<p>If the view is not published for external use, or does not handle message |
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parameters, a simple check and return if the view is already active is sufficient.</p> |
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<p>A common implementation is as follows:</p> |
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<codeblock id="GUID-01819343-975C-499B-9DF6-14DA9BB5912E" xml:space="preserve"> |
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void CMyViewAppView::DoActivateL( |
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const TVwsViewId& /*aPrevViewId*/,TUid /*aCustomMessageId*/, |
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const TDesC8& /*aCustomMessage*/) |
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{ |
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if (!iContainer) |
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{ |
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iContainer = new (ELeave) CMyViewAppContainer; |
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iContainer->SetMopParent(this); |
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iContainer->ConstructL( ClientRect() ); |
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AppUi()->AddToStackL( *this, iContainer ); |
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} |
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// Message handling would take place here. |
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} |
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</codeblock> |
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<p>, where</p> |
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<ul> |
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<li><p><parmname>CMyViewAppView::DoActivateL</parmname> is the override |
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for <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html#486d490d911ce5e9495e0ee19b0442db" format="application/java-archive"><parmname>CAknView::DoActivateL</parmname></xref> for the application.</p></li> |
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<li><p><parmname>if (!iContainer)</parmname> checks to see if the |
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view already exists.</p></li> |
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<li><p><parmname>iContainer = new (ELeave) CMyViewAppContainer;</parmname> calls |
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the first phase constructor of the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived |
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class that provides the view.</p></li> |
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<li><p><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aSetMopParent%28MObjectProvider%20%2a%29" format="application/java-archive"><parmname>iContainer->SetMopParent(this);</parmname></xref> sets the |
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context for the view being created. In this case, it assigns the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived view to the view controller.</p> |
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</li> |
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<li><p><parmname>iContainer->ConstructL( ClientRect() )</parmname> calls |
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the second phase constructor of the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived |
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class that provides the view.</p></li> |
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<li><p><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeAppUiClass.html#%3a%3aCCoeAppUi%3a%3aAddToStackL%28CCoeControl%20%2a%2cTInt%2cTInt%29" format="application/java-archive"><parmname>AppUi()->AddToStackL( *this, iContainer );</parmname></xref> adds |
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the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived view to the control |
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stack for <xref href="GUID-542550FA-F9F1-46D6-8182-6E7FAA013572.dita">key event |
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handling.</xref></p></li> |
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</ul> |
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<p>The view architecture supports an automatic recovery mechanism if <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html#486d490d911ce5e9495e0ee19b0442db" format="application/java-archive"><parmname>CAknView::DoActivateL()</parmname></xref> leaves. The Symbian platform calls <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html#f47363eacbe46c5827282407b354b535" format="application/java-archive"><parmname>CAknView::DoDeactivate()</parmname></xref> in |
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the view that has left, reinstates the previous view of the application, and |
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returns to the view that was just displayed. If the application had no previous |
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view, it exits. If the application’s previous view was the same as the activating |
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view (that is, the view is reactivated with a new message), the application |
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attempts to recover to the default view.</p> |
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<p>In most cases, this mechanism removes the need to put any recovery mechanism |
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in the <parmname>DoActivateL()</parmname> methods. The one situation where |
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you may consider something more complex is when the view can be reactivated |
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(that is, activated with a new message while already active). In this case, |
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the view may attempt a more complex strategy to preserve the existing state |
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if a leave happens during the attempt to handle the new message.</p> |
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<p>To destroy the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived |
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control in a view control, you must override <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html#f47363eacbe46c5827282407b354b535" format="application/java-archive"><parmname>CAknView::DoDeactivate</parmname></xref>. |
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It is called when the application exits, or another view has been activated |
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and the previous active window needs to be shut down. This order makes view |
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switching fast. In <parmname>DoDeactivate</parmname> the view is removed from |
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the stack and therefore the view’s container and its controls are destroyed. |
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This function must not leave.</p> |
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<p>A common implementation is as follows:</p> |
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<codeblock id="GUID-01F7257D-47C2-4A42-9717-97D3913F3AB0" xml:space="preserve"> |
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void CMyViewAppView::DoDeactivate() |
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{ |
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if ( iContainer ) |
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{ |
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AppUi()->RemoveFromViewStack( *this, iContainer ); |
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} |
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|
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delete iContainer; |
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iContainer = NULL; |
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}</codeblock> |
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<p>, where</p> |
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<ul> |
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<li><p><parmname>CMyViewAppView::DoDeactivateL</parmname> is the |
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override for <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html#f47363eacbe46c5827282407b354b535" format="application/java-archive"><parmname>CAknView::DoDeactivateL</parmname></xref> for |
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the application.</p></li> |
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<li><p><parmname>if (!iContainer)</parmname> checks to see if the |
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view already exists.</p></li> |
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<li><p><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeAppUiClass.html#%3a%3aCCoeAppUi%3a%3aRemoveFromViewStack%28const%20MCoeView%20%26amp%3b%2cCCoeControl%20%2a%29" format="application/java-archive"><parmname>AppUi()->RemoveFromViewStack( *this, iContainer );</parmname></xref> removes |
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the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived view from the control |
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stack.</p></li> |
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<li><p><parmname>delete iContainer;</parmname> deletes the <parmname>CCoeControl</parmname>-derived |
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view.</p></li> |
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</ul> |
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</section> |
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</conbody></concept> |