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<concept id="GUID-F25C17AC-BA88-4965-BAE8-AEF0E2EA66EC" xml:lang="en"><title>Zooming

actions</title><shortdesc>Mobile device users must be able to zoom in and out consistently

within applications on a mobile device. However the zooming actions may  differ

from one device model to another.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The product features and form factor of a mobile device determine which

zooming actions application developers should make available on it: </p>

<ul>

<li><p>If the device has an ITU-T keypad, the asterisk (*) key zooms in and

the hash mark (#) key zooms out. This functionality is not available in editors

or other states where the keys play another role. In these cases, the zoom

functions, if applicable, must be available in the <uicontrol>Options</uicontrol> menu. </p></li>

<li><p>If the device has a QWERTY or half-QWERTY keyboard, use the two topmost

keys at the top left of the keyboard for zooming in and out. For example,

on a Latin keyboard, use the Q key to zoom in and the A key to zoom out. Some

products might have zooming symbols printed on the keyboard to help users

find the zooming features. Again, the functions are not available in editors.</p></li>

<li><p>On touch devices, users can use touch stripes to zoom. Finger movement

along the stripe controls zooming. Applications may support different number

of zoom levels. It should be possible to zoom across the full range with one

swipe.</p></li>

<li><p>On touch devices with multi-touch support, users can use pinch zoom.

See <xref href="GUID-17C64C2F-9426-4B41-9F0A-23060289D644.dita">Multi-touch</xref> section

for more details on pinch in and pinch out.</p></li>

<li><p>On touch devices, some applications may support double-tapping zoom.

A double tap can toggle between zoomed and normal view, but this depends on

the application.</p></li>

</ul>

</conbody></concept>