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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-B5DE1C86-2B16-4B22-887F-7079E54A8ED6" xml:lang="en"><title>Traditional

    13 Symbian UI application architecture</title><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <p>The following image illustrates the components of the traditional architecture

    15 approach.</p>

    16 <fig id="GUID-F38DBC9C-31C0-4E4F-934C-38BA4A4B649F"><title>Traditional Symbian UI application architecture classes</title><image href="GUID-E477BB63-FE72-4460-AB42-D82FFFCE4CF0_d0e68214_href.png"/></fig>

    17 <p>Symbian platform applications that follow the traditional Symbian UI

    18 application architecture require:</p>

    19 <ul>

    20 <li><p>a <xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita">UI

    21 controller</xref> derived from <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknAppUi.html" format="application/java-archive"><parmname>CAknAppUi</parmname></xref></p>

    22 </li>

    23 <li><p>a <xref href="GUID-DAC32BB9-C0EB-42FF-A596-C2F1A90A4BD7.dita">view</xref> or

    24 views derived from <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></p>

    25 </li>

    26 </ul>

    27 <p>The traditional Symbian UI application architecture provides the most

    28 flexible approach to application UI construction. Traditional architecture

    29 is easier to port across different platforms than <xref href="GUID-68B999C2-0993-4804-9624-42C3D88BE5C7.dita">view

    30 architecture</xref>. Traditional architecture is also the best choice for

    31 single-view applications, if launching the view from external applications

    32 is not required.</p>

    33 <p>Typical responsibilities in this architecture are:</p>

    34 <ul>

    35 <li><p><xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknAppUi.html" format="application/java-archive"><parmname>CAknAppUi</parmname></xref>-derived

    36 class acts as a UI controller:</p>

    37 <ul>

    38 <li><p>It <xref href="GUID-A29FB4CA-2161-4407-BA69-48FBF5D7543F.dita">creates</xref> one

    39 or more <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 views.</p></li>

    40 <li><p>It handles <xref href="GUID-EF7FF39E-929F-4767-B475-5D582D37BB32.dita">events</xref>,

    41 including enabling views to handle <xref href="GUID-E402616A-7ED8-45AC-B836-99C3A3760B33.dita">key

    42 events</xref>.</p></li>

    43 <li><p>To <xref href="GUID-FC63E2D1-697C-4890-9B70-0DC0AAE7597C.dita">switch

    44 between views</xref>, it creates and destroys or shows and hides views.</p>

    45 </li>

    46 <li><p>It handles menu <xref href="GUID-4941C035-C359-4968-9BD5-31F44EE5F810.dita">commands</xref>.</p>

    47 </li>

    48 <li><p>It receives events such as <xref href="GUID-DD15F24B-0786-4531-A6C5-A5E70EBE2732.dita">layout</xref> and <xref href="GUID-3B441CDC-AB7A-4D8D-A595-57C21E1D426C.dita">foreground</xref> notifications

    49 from the run-time environment.</p></li>

    50 </ul>

    51 </li>

    52 </ul>

    53 <ul>

    54 <li><p><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

    55 view:</p>

    56 <ul>

    57 <li><p>Shows application data and state on the screen.</p></li>

    58 <li><p>Receives user input.</p></li>

    59 <li><p>Notifies the <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknAppUi.html" format="application/java-archive"><parmname>CAknAppUi</parmname></xref>-derived

    60 class of relevant events.</p></li>

    61 <li><p>Often observes model changes (directly or via the UI controller)

    62 and updates the screen accordingly.</p></li>

    63 </ul>

    64 </li>

    65 </ul>

    66 <p>For more information on the <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknApplication.html" format="application/java-archive"><parmname>CAknApplication</parmname></xref> and <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknDocument.html" format="application/java-archive"><parmname>CAknDocument</parmname></xref>-derived

    67 classes, see <xref href="GUID-BDDDF68F-F7C3-43AF-8B6C-C77C701FD2A9.dita">Framework

    68 requirements for GUI applications</xref>.</p>

    69 </conbody></concept>