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    10 <!DOCTYPE concept

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

    12 <concept id="GUID-BBC374AD-88E6-5C58-88BB-B939C2948DDA" xml:lang="en"><title>Application

    13 user interface (AppUi)</title><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <p>Cone provides the <xref href="GUID-3AC2CDAC-0291-309F-A020-049BC9F2CF90.dita"><apiname>CCoeAppUi</apiname></xref> class as a generic base

    15 for application user interface development. Uikon provides a specialization, <xref href="GUID-1185F595-0488-3E93-8D60-6B3A1A3AC32E.dita"><apiname>CEikAppUi</apiname></xref>,

    16 from which concrete application UIs can be derived. UI variant libraries typically

    17 derive their own AppUi base class from <xref href="GUID-1185F595-0488-3E93-8D60-6B3A1A3AC32E.dita"><apiname>CEikAppUi</apiname></xref> to standardize

    18 common UI paradigms. <xref href="GUID-3AC2CDAC-0291-309F-A020-049BC9F2CF90.dita"><apiname>CCoeAppUi</apiname></xref> is, therefore, normally

    19 a 'long way' from the surface of the finished application and knows little

    20 of the concrete controls or functionality that it contains. </p>

    21 <p> <xref href="GUID-3AC2CDAC-0291-309F-A020-049BC9F2CF90.dita"><apiname>CCoeAppUi</apiname></xref> provides the following key functionality: </p>

    22 <ul>

    23 <li id="GUID-96F849A2-4022-5564-8A28-A8D3615304CF"><p>An event-handling framework </p> <p> <xref href="GUID-3AC2CDAC-0291-309F-A020-049BC9F2CF90.dita"><apiname>CCoeAppUi</apiname></xref> is

    24 the at the top of the run-time control hierarchy. It is the point at which

    25 key-press events are received from the Window Server. Many of the event-handling

    26 functions are virtual and implemented in the derived AppUi classes. </p> </li>

    27 </ul>

    28 <fig id="GUID-9FC56BFC-6DF5-5BF8-BDCD-65579655C558">

    29 <image href="GUID-59A9871D-B0F3-54E2-A5BA-38790C109797_d0e47131_href.png" placement="inline"/>

    30 </fig>

    31 <ul>

    32 <li id="GUID-380D267D-F442-5AE3-A361-CACEA4E97A88"><p>View Management </p> <p>The

    33 View Manager (<xref href="GUID-1444A0B4-8828-3EEB-8DC7-C331648A5201.dita"><apiname>CCoeViewManager</apiname></xref>) is encapsulated by <xref href="GUID-3AC2CDAC-0291-309F-A020-049BC9F2CF90.dita"><apiname>CCoeAppUi</apiname></xref> which

    34 provides a view management API. </p> <p>Views are concrete classes that implement

    35 the <xref href="GUID-2C5E3F6C-6679-3914-9736-62296E7715A7.dita"><apiname>MCoeView</apiname></xref> interface. Typically they are top-level window-owning

    36 controls. </p> <p>The significance of views is that they are known of outside

    37 the application to which they belong. This allows one application to switch,

    38 or link, directly to a view in another. If the target application is running

    39 it will be brought to the foreground with the linked view activated. If it

    40 isn't running it will be started up first. </p> <p>All of the API required

    41 for implementing, registering, activating, deactivating, linking and observing

    42 is provided by <xref href="GUID-2C5E3F6C-6679-3914-9736-62296E7715A7.dita"><apiname>MCoeView</apiname></xref> and <xref href="GUID-3AC2CDAC-0291-309F-A020-049BC9F2CF90.dita"><apiname>CCoeAppUi</apiname></xref>. </p> <p>To

    43 participate fully in the view architecture an application must register at

    44 least one view. An application with no views may still be linked to using

    45 the view architecture. It registers itself with a <codeph>TVwsViewId</codeph> containing

    46 its application UID. Obviously it will not receive activation and deactivation

    47 events but will trigger view switch events in other applications' views. </p> <p>An

    48 application may opt out of the view architecture (see <xref href="GUID-42003A58-F3FE-3FEB-8019-A819B860C64B.dita#GUID-42003A58-F3FE-3FEB-8019-A819B860C64B/GUID-DC2562EE-67C1-3FD3-8A43-FA9F1B02DE07"><apiname>TApaCommand::EApaCommandRunWithoutViews</apiname></xref> and <xref href="GUID-42003A58-F3FE-3FEB-8019-A819B860C64B.dita#GUID-42003A58-F3FE-3FEB-8019-A819B860C64B/GUID-84C2A808-B397-3656-A422-E1E10FE04330"><apiname>TApaCommand::EApaCommandBackgroundAndWithoutViews</apiname></xref>) </p> </li>

    49 </ul>

    50 </conbody></concept>