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15 different architecture solutions to meet their requirements. One example of |
15 different architecture solutions to meet their requirements. One example of |
16 a common approach includes the Model - View - Controller (MVC) pattern used |
16 a common approach includes the Model - View - Controller (MVC) pattern used |
17 in GUI-based applications. In this approach, the application is split into |
17 in GUI-based applications. In this approach, the application is split into |
18 three separate logical parts. Each part contains a different aspect of the |
18 three separate logical parts. Each part contains a different aspect of the |
19 entire application, and has a specific role.</p> |
19 entire application, and has a specific role.</p> |
20 <fig id="GUID-5E3A844B-CCF3-4F2A-82A9-DA7A5B65A572"><title>Logical dependencies in the MVC pattern</title><image href="GUID-A5E152B2-F15C-4809-A52A-BCDDBCD93255_d0e41998_href.png"/></fig> |
20 <fig id="GUID-5E3A844B-CCF3-4F2A-82A9-DA7A5B65A572"><title>Logical dependencies in the MVC pattern</title><image href="GUID-A5E152B2-F15C-4809-A52A-BCDDBCD93255_d0e36431_href.png"/></fig> |
21 <p>In this approach, the model:</p> |
21 <p>In this approach, the model:</p> |
22 <ul> |
22 <ul> |
23 <li><p>contains and manipulates the data in the application</p> |
23 <li><p>contains and manipulates the data in the application</p> |
24 </li> |
24 </li> |
25 <li><p>is owned by the controller</p></li> |
25 <li><p>is owned by the controller</p></li> |
51 architecture</xref>.</p></li> |
51 architecture</xref>.</p></li> |
52 <li><p>requires the implementation of <xref href="GUID-4F825D83-47A4-36C9-9A25-943A6D799F84.dita"><apiname>CAknApplication</apiname></xref> and <xref href="GUID-935C59EE-AD66-33FE-987B-BD97F5147CC1.dita"><apiname>CAknDocument</apiname></xref> derived |
52 <li><p>requires the implementation of <xref href="GUID-4F825D83-47A4-36C9-9A25-943A6D799F84.dita"><apiname>CAknApplication</apiname></xref> and <xref href="GUID-935C59EE-AD66-33FE-987B-BD97F5147CC1.dita"><apiname>CAknDocument</apiname></xref> derived |
53 classes.</p></li> |
53 classes.</p></li> |
54 </ul> |
54 </ul> |
55 <p>The pattern is implemented with the following classes.</p> |
55 <p>The pattern is implemented with the following classes.</p> |
56 <fig id="GUID-B4508A88-B688-4BB7-B42A-31BFF41CD4FA"><title>Relationship between the classes that make up a typical Symbian application</title><image href="GUID-36BB14BD-34B3-4F5D-A670-707710E57585_d0e42116_href.png"/></fig> |
56 <fig id="GUID-B4508A88-B688-4BB7-B42A-31BFF41CD4FA"><title>Relationship between the classes that make up a typical Symbian application</title><image href="GUID-36BB14BD-34B3-4F5D-A670-707710E57585_d0e36549_href.png"/></fig> |
57 <p>The <xref href="GUID-4F825D83-47A4-36C9-9A25-943A6D799F84.dita"><apiname>CAknApplication</apiname></xref>-derived class:</p> |
57 <p>The <xref href="GUID-4F825D83-47A4-36C9-9A25-943A6D799F84.dita"><apiname>CAknApplication</apiname></xref>-derived class:</p> |
58 <ul> |
58 <ul> |
59 <li><p>provides the application object expected by the application |
59 <li><p>provides the application object expected by the application |
60 framework when the application is launched.</p></li> |
60 framework when the application is launched.</p></li> |
61 <li><p>defines the application properties.</p></li> |
61 <li><p>defines the application properties.</p></li> |