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      <mal:years>2015</mal:years>
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<title>Casillas</title>

<p>Las casillas se usan para mostrar o cambiar una configuración. Tienen dos estados, activada y desactivada, y se distinguen por la presencia de una marca en la casilla etiquetada.</p>

<media type="image" mime="image/svg" src="figures/ui-elements/check-boxes.svg"/>

<section id="guidelines">
<title>Guías</title>

<list>
<item><p>Pulsar sobre una casilla no debería alterar los valores de los demás controles. No obstante, sí puede sensibilizar, desensibilizar, ocultar o mostrar otros controles.</p></item>
<item><p>Si la activación de una casilla afectará a la sensibilidad de otros controles, coloque la casilla inmediatamente por encima o a la izquierda de los controles a los que afecte. Esto indica que dichos controles son dependientes del estado en que se encuentre la casilla.</p></item>
<item><p><link xref="writing-style#capitalization">Escriba en mayúsculas la primera letra de las etiquetas</link> de sus casillas, por ejemplo, <gui>Utilizar tipografía personalizada</gui>.</p></item>
<item><p>Label check boxes to clearly indicate the effects of both their checked and unchecked states, for example, <gui>Show icons in menus</gui>. If the two states of a check box cannot be clearly communicated, consider using two radio buttons instead so both states can be given labels.</p></item>
<item><p>Avoid negative check box labels, as this can be confusing and hard to understand. <gui>Play alert sound</gui> is better than <gui>Disable alert sound</gui>, for example.</p></item>
<item><p>Provide an <link xref="keyboard-input#access-keys">access key</link> in all check box labels that allows the user to set or unset the check box directly from the keyboard.</p></item>
<item><p>If the check box represents a setting in a multiple selection that is set for some objects in the selection and unset for others, show the check box in its mixed state. When a check box is in its mixed state:</p>
<list>
<item><p>Clicking the box once should check the box, applying that setting (when confirmed) to all the selected objects.</p></item>
<item><p>Clicking the box a second time should uncheck the box, removing that setting (when confirmed) to all the selected objects.</p></item>
<item><p>Clicking the box a third time should return the box to its mixed state, restoring each selected object’s original value for that setting (when confirmed).</p></item>
</list></item>
<item><p>Label a group of check boxes with a descriptive heading above or to the left of the group.</p></item>
<item><p>Do not place more than about eight check boxes under the same group heading. If you need more than eight, try to use blank space or heading labels to divide them into smaller groups. Otherwise, consider using a check box list instead— but you probably also need to think about how to simplify your user interface.</p></item>
<item><p>Try to align groups of check boxes vertically rather than horizontally, as this makes them easier to scan visually. Use horizontal or rectangular alignments only if they greatly improve the layout of the window.</p></item>
</list>

</section>
</page>
