@import "mediawiki.mixins";
@import "mediawiki.ui/variables";

// Radio
//
// Styling radios in a way that works cross browser is a tricky problem to solve.
// In MediaWiki UI put a radio and label inside a mw-ui-radio div.
// This renders in all browsers except IE6-8 which do not support the :checked selector;
// these are kept backwards-compatible using the :not(#noop) selector.
// You should give the radio and label matching "id" and "for" attributes, respectively.
//
// Markup:
// <div class="mw-ui-radio">
//   <input type="radio" id="kss-example-4" name="kss-example-4">
//   <label for="kss-example-4">Standard radio</label>
// </div>
// <div class="mw-ui-radio">
//   <input type="radio" id="kss-example-4-checked" name="kss-example-4" checked>
//   <label for="kss-example-4-checked">Standard checked radio</label>
// </div>
// <div class="mw-ui-radio">
//   <input type="radio" id="kss-example-4-disabled" name="kss-example-4-disabled" disabled>
//   <label for="kss-example-4-disabled">Disabled radio</label>
// </div>
// <div class="mw-ui-radio">
//   <input type="radio" id="kss-example-4-disabled-checked" name="kss-example-4-disabled" disabled checked>
//   <label for="kss-example-4-disabled-checked">Disabled checked radio</label>
// </div>
//
// Styleguide 4.
.mw-ui-radio {
	display: inline-block;
	vertical-align: middle;
}

@radioSize: 2em;

// We use the not selector to cancel out styling on IE 8 and below.
// We also disable this styling on javascript disabled devices. This fixes the issue with
// Opera Mini where checking/unchecking doesn't apply styling but potentially leaves other
// more capable browsers with unstyled radio buttons.
.client-js .mw-ui-radio:not(#noop) {
	// Position relatively so we can make use of absolute pseudo elements
	position: relative;
	line-height: @radioSize;

	* {
		// reset font sizes (see bug 72727)
		font: inherit;
		vertical-align: middle;
	}

	input[type="radio"] {
		// we hide the input element as instead we will style the label that follows
		// we use opacity so that VoiceOver software can still identify it
		opacity: 0;
		// ensure the invisible radio takes up the required width
		width: @radioSize;
		height: @radioSize;
		// This is needed for Firefox mobile (See bug 71750 to workaround default Firefox stylesheet)
		max-width: none;
		margin-right: 0.4em;

		// the pseudo before element of the label after the radio now looks like a radio
		& + label::before {
			.transition( 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275) );
			content: '';
			cursor: pointer;
			.box-sizing(border-box);
			position: absolute;
			left: 0;
			border-radius: 100%;
			width: @radioSize;
			height: @radioSize;
			background-color: #fff;
			border: 1px solid @colorGray7;
			.background-image-svg('images/radio_checked.svg', 'images/radio_checked.png');
			.background-size( @radioSize, @radioSize );
			background-repeat: no-repeat;
			background-position: center center;
			background-origin: border-box;
			background-size: 0 0;
		}

		// when the input is checked, style the label pseudo before element that followed as a checked radio
		&:checked + label::before {
			background-size: 100% 100%;
		}

		&:active + label::before {
			background-color: @colorGray13;
			border-color: @colorGray13;
		}

		&:focus + label::before {
			border-width: 2px;
		}

		&:focus:hover + label::before,
		&:hover + label::before {
			border-bottom-width: 3px;
		}

		// disabled radios have a gray background
		&:disabled + label::before {
			cursor: default;
			background-color: @colorGray14;
			border-color: @colorGray14;
		}

		// disabled and checked radios have a white circle
		&:disabled:checked + label::before {
			.background-image-svg('images/radio_disabled.svg', 'images/radio_disabled.png');
		}
	}
}
