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<concept id="GUID-F3EE1000-71A6-4D48-A30B-3D2357BF20FB" xml:lang="en"><title>Generic

button API</title><shortdesc>The Generic button API is used for enabling touch support for buttons.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>An Avkon button is a generic button component specifically designed for

touch support. The generic button component (<xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknButton.html" format="application/java-archive"><codeph>CAknButton</codeph></xref>, defined in <codeph>aknbutton.h</codeph>) is used, for example, in

a toolbar and a status pane. The button can contain text, an image, or both. </p>

<p>Buttons can have multiple states, and each of the states can have three

different states according to user actions. The possible user-action states

for the button states are:</p>

<ul>

<li><p>Normal</p></li>

<li><p>Pressed down</p></li>

<li><p>Dimmed</p></li>

</ul>

<p>By default, the button has a frame, it responds to tap (press) event, has

a latchable view in the pressed-down state, and has horizontally and vertically

aligned text in it. Some default behavior can be changed with button flags

or with the help of member functions. </p>

<p>To observe the buttons in your application, use the <codeph>MCoeControlObserver</codeph> observer

interface.</p>

<fig id="GUID-EEC0C576-8EEC-481E-817F-6E137E4F6A7D">

<title>Generic button used in a toolbar</title>

<image href="GUID-ED823C5E-A59B-476A-BF88-0FCBA5D35FED_d0e77324_href.png" scale="50" placement="inline"/>

</fig>

<note><p> The Generic button API is used for creating buttons that are displayed

as parts of container components, such as a toolbar. It is not used for creating

CBA buttons displayed in the control pane at the bottom of the device screen.

The API for creating CBA buttons is the <xref format="html" href="specs/guides/Buttons_API_Specification/Buttons_API_Specification.html" scope="peer">Buttons API</xref>.</p></note>

<p>For look and feel guidelines on the generic button component as part of

a toolbar, see the <xref href="GUID-EB212C35-5416-4CA7-8091-61B45D78E220.dita">toolbar

UI component description</xref>.</p>

<p>For information on using the API, see <xref href="GUID-97712509-84AD-462F-8FFB-E1E6D8278938.dita">Enabling

touch support for buttons</xref>.</p>

<p>For the Generic button API classes and header files, see Classes and Definitions.</p>

<section id="GUID-3334EF0D-D9BF-468D-B218-27FA9A2492AC"><title>Constraints</title><p>This

API is valid for all platforms running on Symbian OS v9.3 or later.</p></section>

<section id="GUID-EA74FA6F-FA20-47D7-99F2-9A98A4F24CF1"><title>Emulator support</title><p>This

API is supported in the WINS/WINSCW emulator environment, with the following

exception:</p><ul>

<li><p>Tactile feedback is not supported.</p></li>

</ul></section>

</conbody><related-links>

<linklist><title>Related APIs</title>

<link format="html" href="specs/guides/Skins_API_Specification/Skins_API_Specification.html" scope="peer"><linktext>Skins API</linktext>

<desc> for adding skin support to the button</desc>

</link>

<link href="GUID-B05B61B8-1217-441F-BAFA-C209C8F123C5.dita"><linktext>Toolbar API</linktext>

<desc> for creating a toolbar containing generic buttons</desc>

</link>

<link href="GUID-92018B6B-3CBB-434D-9E61-F271C67E98E3.dita"><linktext>Touch UI

utilities API</linktext>

<desc> for using long-tap events</desc>

</link>

</linklist>

</related-links></concept>