bootstrap-less-port/less/_custom-forms.less

A Less port of Bootstrap v4

// Embedded icons from Open Iconic.
// Released under MIT and copyright 2014 Waybury.
// https://useiconic.com/open


// Checkboxes and radios
//
// Base class takes care of all the key behavioral aspects.

.custom-control {
	position: relative;
	z-index: 1;
	display: block;
	min-height: (@font-size-base * @line-height-base);
	padding-left: (@custom-control-gutter + @custom-control-indicator-size);
	color-adjust: exact; // Keep themed appearance for print
}

.custom-control-inline {
	display: inline-flex;
	margin-right: @custom-control-spacer-x;
}

.custom-control-input {
	position: absolute;
	left: 0;
	z-index: -1; // Put the input behind the label so it doesn't overlay text
	width: @custom-control-indicator-size;
	height: ((@font-size-base * @line-height-base + @custom-control-indicator-size) / 2);
	opacity: 0;

	&:checked ~ .custom-control-label::before {
		color: @custom-control-indicator-checked-color;
		border-color: @custom-control-indicator-checked-border-color;
		#gradient-bg(@custom-control-indicator-checked-bg);
		#box-shadow(@custom-control-indicator-checked-box-shadow);
	}

	&:focus ~ .custom-control-label::before {
		// the mixin is not used here to make sure there is feedback
		& when (@enable-shadows) {
			box-shadow: @input-box-shadow, @custom-control-indicator-focus-box-shadow;
		}
		& when not (@enable-shadows) {
			box-shadow: @custom-control-indicator-focus-box-shadow;
		}
	}

	&:focus:not(:checked) ~ .custom-control-label::before {
		border-color: @custom-control-indicator-focus-border-color;
	}

	&:not(:disabled):active ~ .custom-control-label::before {
		color: @custom-control-indicator-active-color;
		background-color: @custom-control-indicator-active-bg;
		border-color: @custom-control-indicator-active-border-color;
		#box-shadow(@custom-control-indicator-active-box-shadow);
	}

	// Use [disabled] and :disabled to work around https://github.com/twbs/bootstrap/issues/28247
	&[disabled],
	&:disabled {
		~ .custom-control-label {
			color: @custom-control-label-disabled-color;

			&::before {
				background-color: @custom-control-indicator-disabled-bg;
			}
		}
	}
}

// Custom control indicators
//
// Build the custom controls out of pseudo-elements.

.custom-control-label {
	position: relative;
	margin-bottom: 0;
	// LESS PORT: Less doesn’t strip “empty” property values so we have to check for a value first.
	& when not (@custom-control-label-color = ~"") { color: @custom-control-label-color; }
	vertical-align: top;
	// LESS PORT: Less doesn’t strip “empty” property values so we have to check for a value first.
	& when not (@custom-control-cursor = ~"") { cursor: @custom-control-cursor; }

	// Background-color and (when enabled) gradient
	&::before {
		position: absolute;
		top: ((@font-size-base * @line-height-base - @custom-control-indicator-size) / 2);
		left: -(@custom-control-gutter + @custom-control-indicator-size);
		display: block;
		width: @custom-control-indicator-size;
		height: @custom-control-indicator-size;
		pointer-events: none;
		content: "";
		background-color: @custom-control-indicator-bg;
		border: @custom-control-indicator-border-color solid @custom-control-indicator-border-width;
		#box-shadow(@custom-control-indicator-box-shadow);
	}

	// Foreground (icon)
	&::after {
		position: absolute;
		top: ((@font-size-base * @line-height-base - @custom-control-indicator-size) / 2);
		left: -(@custom-control-gutter + @custom-control-indicator-size);
		display: block;
		width: @custom-control-indicator-size;
		height: @custom-control-indicator-size;
		content: "";
		background: 50% ~"/" @custom-control-indicator-bg-size no-repeat;
	}
}


// Checkboxes
//
// Tweak just a few things for checkboxes.

.custom-checkbox {
	.custom-control-label::before {
		#border-radius(@custom-checkbox-indicator-border-radius);
	}

	.custom-control-input:checked ~ .custom-control-label {
		&::after {
			background-image: escape-svg(@custom-checkbox-indicator-icon-checked);
		}
	}

	.custom-control-input:indeterminate ~ .custom-control-label {
		&::before {
			border-color: @custom-checkbox-indicator-indeterminate-border-color;
			#gradient-bg(@custom-checkbox-indicator-indeterminate-bg);
			#box-shadow(@custom-checkbox-indicator-indeterminate-box-shadow);
		}
		&::after {
			background-image: escape-svg(@custom-checkbox-indicator-icon-indeterminate);
		}
	}

	.custom-control-input:disabled {
		&:checked ~ .custom-control-label::before {
			#gradient-bg(@custom-control-indicator-checked-disabled-bg);
		}
		&:indeterminate ~ .custom-control-label::before {
			#gradient-bg(@custom-control-indicator-checked-disabled-bg);
		}
	}
}

// Radios
//
// Tweak just a few things for radios.

.custom-radio {
	.custom-control-label::before {
		border-radius: @custom-radio-indicator-border-radius;
	}

	.custom-control-input:checked ~ .custom-control-label {
		&::after {
			background-image: escape-svg(@custom-radio-indicator-icon-checked);
		}
	}

	.custom-control-input:disabled {
		&:checked ~ .custom-control-label::before {
			#gradient-bg(@custom-control-indicator-checked-disabled-bg);
		}
	}
}


// switches
//
// Tweak a few things for switches

.custom-switch {
	padding-left: (@custom-switch-width + @custom-control-gutter);

	.custom-control-label {
		&::before {
			left: -(@custom-switch-width + @custom-control-gutter);
			width: @custom-switch-width;
			pointer-events: all;
			border-radius: @custom-switch-indicator-border-radius;
		}

		&::after {
			// LESS PORT: Using format strings here so we can put computed values in the `calc()`.
			top: add(((@font-size-base * @line-height-base - @custom-control-indicator-size) / 2), (@custom-control-indicator-border-width * 2));
			left: add(-(@custom-switch-width + @custom-control-gutter), (@custom-control-indicator-border-width * 2));
			width: @custom-switch-indicator-size;
			height: @custom-switch-indicator-size;
			background-color: @custom-control-indicator-border-color;
			border-radius: @custom-switch-indicator-border-radius;
			#transition(transform 0.15s ease-in-out, @custom-forms-transition);
		}
	}

	.custom-control-input:checked ~ .custom-control-label {
		&::after {
			background-color: @custom-control-indicator-bg;
			transform: translateX((@custom-switch-width - @custom-control-indicator-size));
		}
	}

	.custom-control-input:disabled {
		&:checked ~ .custom-control-label::before {
			#gradient-bg(@custom-control-indicator-checked-disabled-bg);
		}
	}
}


// Select
//
// Replaces the browser default select with a custom one, mostly pulled from
// https://primer.github.io/.
//

.custom-select {
	display: inline-block;
	width: 100%;
	height: @custom-select-height;
	padding: @custom-select-padding-y (@custom-select-padding-x + @custom-select-indicator-padding) @custom-select-padding-y @custom-select-padding-x;
	// LESS PORT: Less doesn’t strip “empty” property values so we have to check for a value first.
	& when not (@custom-select-font-family = ~"") { font-family: @custom-select-font-family; }
	#font-size(@custom-select-font-size);
	font-weight: @custom-select-font-weight;
	line-height: @custom-select-line-height;
	color: @custom-select-color;
	vertical-align: middle;
	background: @custom-select-bg @custom-select-background;
	border: @custom-select-border-width solid @custom-select-border-color;
	#border-radius(@custom-select-border-radius, 0);
	#box-shadow(@custom-select-box-shadow);
	appearance: none;

	&:focus {
		border-color: @custom-select-focus-border-color;
		outline: 0;
		& when (@enable-shadows) {
			#box-shadow(@custom-select-box-shadow, @custom-select-focus-box-shadow);
		}
		& when not (@enable-shadows) {
			// Avoid using mixin so we can pass custom focus shadow properly
			box-shadow: @custom-select-focus-box-shadow;
		}

		&::-ms-value {
			// For visual consistency with other platforms/browsers,
			// suppress the default white text on blue background highlight given to
			// the selected option text when the (still closed) <select> receives focus
			// in IE and (under certain conditions) Edge.
			// See https://github.com/twbs/bootstrap/issues/19398.
			color: @input-color;
			background-color: @input-bg;
		}
	}

	&[multiple],
	&[size]:not([size="1"]) {
		height: auto;
		padding-right: @custom-select-padding-x;
		background-image: none;
	}

	&:disabled {
		color: @custom-select-disabled-color;
		background-color: @custom-select-disabled-bg;
	}

	// Hides the default caret in IE11
	&::-ms-expand {
		display: none;
	}

	// Remove outline from select box in FF
	&:-moz-focusring {
		color: transparent;
		text-shadow: 0 0 0 @custom-select-color;
	}
}

.custom-select-sm {
	height: @custom-select-height-sm;
	padding-top: @custom-select-padding-y-sm;
	padding-bottom: @custom-select-padding-y-sm;
	padding-left: @custom-select-padding-x-sm;
	#font-size(@custom-select-font-size-sm);
}

.custom-select-lg {
	height: @custom-select-height-lg;
	padding-top: @custom-select-padding-y-lg;
	padding-bottom: @custom-select-padding-y-lg;
	padding-left: @custom-select-padding-x-lg;
	#font-size(@custom-select-font-size-lg);
}


// File
//
// Custom file input.

.custom-file {
	position: relative;
	display: inline-block;
	width: 100%;
	height: @custom-file-height;
	margin-bottom: 0;
}

.custom-file-input {
	position: relative;
	z-index: 2;
	width: 100%;
	height: @custom-file-height;
	margin: 0;
	overflow: hidden;
	opacity: 0;

	&:focus ~ .custom-file-label {
		border-color: @custom-file-focus-border-color;
		box-shadow: @custom-file-focus-box-shadow;
	}

	// Use [disabled] and :disabled to work around https://github.com/twbs/bootstrap/issues/28247
	&[disabled] ~ .custom-file-label,
	&:disabled ~ .custom-file-label {
		background-color: @custom-file-disabled-bg;
	}

	each(@custom-file-text, #(@value, @lang) {
		&:lang(@{lang}) ~ .custom-file-label::after {
			content: @value;
		}
	});

	~ .custom-file-label[data-browse]::after {
		content: attr(data-browse);
	}
}

.custom-file-label {
	position: absolute;
	top: 0;
	right: 0;
	left: 0;
	z-index: 1;
	height: @custom-file-height;
	padding: @custom-file-padding-y @custom-file-padding-x;
	overflow: hidden;
	// LESS PORT: Less doesn’t strip “empty” property values so we have to check for a value first.
	& when not (@custom-file-font-family = ~"") { font-family: @custom-file-font-family; }
	font-weight: @custom-file-font-weight;
	line-height: @custom-file-line-height;
	color: @custom-file-color;
	background-color: @custom-file-bg;
	border: @custom-file-border-width solid @custom-file-border-color;
	#border-radius(@custom-file-border-radius);
	#box-shadow(@custom-file-box-shadow);

	&::after {
		position: absolute;
		top: 0;
		right: 0;
		bottom: 0;
		z-index: 3;
		display: block;
		height: @custom-file-height-inner;
		padding: @custom-file-padding-y @custom-file-padding-x;
		line-height: @custom-file-line-height;
		color: @custom-file-button-color;
		content: "Browse";
		#gradient-bg(@custom-file-button-bg);
		border-left: inherit;
		#border-radius(0 @custom-file-border-radius @custom-file-border-radius 0);
	}
}

// Range
//
// Style range inputs the same across browsers. Vendor-specific rules for pseudo
// elements cannot be mixed. As such, there are no shared styles for focus or
// active states on prefixed selectors.

.custom-range {
	width: 100%;
	height: add(@custom-range-thumb-height, (@custom-range-thumb-focus-box-shadow-width * 2));
	padding: 0; // Need to reset padding
	background-color: transparent;
	appearance: none;

	&:focus {
		outline: 0;

		// Pseudo-elements must be split across multiple rulesets to have an effect.
		// No box-shadow() mixin for focus accessibility.
		&::-webkit-slider-thumb { box-shadow: @custom-range-thumb-focus-box-shadow; }
		&::-moz-range-thumb     { box-shadow: @custom-range-thumb-focus-box-shadow; }
		&::-ms-thumb            { box-shadow: @custom-range-thumb-focus-box-shadow; }
	}

	&::-moz-focus-outer {
		border: 0;
	}

	&::-webkit-slider-thumb {
		width: @custom-range-thumb-width;
		height: @custom-range-thumb-height;
		margin-top: ((@custom-range-track-height - @custom-range-thumb-height) / 2); // Webkit specific
		#gradient-bg(@custom-range-thumb-bg);
		border: @custom-range-thumb-border;
		#border-radius(@custom-range-thumb-border-radius);
		#box-shadow(@custom-range-thumb-box-shadow);
		#transition(@custom-forms-transition);
		appearance: none;

		&:active {
			#gradient-bg(@custom-range-thumb-active-bg);
		}
	}

	&::-webkit-slider-runnable-track {
		width: @custom-range-track-width;
		height: @custom-range-track-height;
		color: transparent; // Why?
		cursor: @custom-range-track-cursor;
		background-color: @custom-range-track-bg;
		border-color: transparent;
		#border-radius(@custom-range-track-border-radius);
		#box-shadow(@custom-range-track-box-shadow);
	}

	&::-moz-range-thumb {
		width: @custom-range-thumb-width;
		height: @custom-range-thumb-height;
		#gradient-bg(@custom-range-thumb-bg);
		border: @custom-range-thumb-border;
		#border-radius(@custom-range-thumb-border-radius);
		#box-shadow(@custom-range-thumb-box-shadow);
		#transition(@custom-forms-transition);
		appearance: none;

		&:active {
			#gradient-bg(@custom-range-thumb-active-bg);
		}
	}

	&::-moz-range-track {
		width: @custom-range-track-width;
		height: @custom-range-track-height;
		color: transparent;
		cursor: @custom-range-track-cursor;
		background-color: @custom-range-track-bg;
		border-color: transparent; // Firefox specific?
		#border-radius(@custom-range-track-border-radius);
		#box-shadow(@custom-range-track-box-shadow);
	}

	&::-ms-thumb {
		width: @custom-range-thumb-width;
		height: @custom-range-thumb-height;
		margin-top: 0; // Edge specific
		margin-right: @custom-range-thumb-focus-box-shadow-width; // Workaround that overflowed box-shadow is hidden.
		margin-left: @custom-range-thumb-focus-box-shadow-width;  // Workaround that overflowed box-shadow is hidden.
		#gradient-bg(@custom-range-thumb-bg);
		border: @custom-range-thumb-border;
		#border-radius(@custom-range-thumb-border-radius);
		#box-shadow(@custom-range-thumb-box-shadow);
		#transition(@custom-forms-transition);
		appearance: none;

		&:active {
			#gradient-bg(@custom-range-thumb-active-bg);
		}
	}

	&::-ms-track {
		width: @custom-range-track-width;
		height: @custom-range-track-height;
		color: transparent;
		cursor: @custom-range-track-cursor;
		background-color: transparent;
		border-color: transparent;
		border-width: (@custom-range-thumb-height / 2);
		#box-shadow(@custom-range-track-box-shadow);
	}

	&::-ms-fill-lower {
		background-color: @custom-range-track-bg;
		#border-radius(@custom-range-track-border-radius);
	}

	&::-ms-fill-upper {
		margin-right: 15px; // arbitrary?
		background-color: @custom-range-track-bg;
		#border-radius(@custom-range-track-border-radius);
	}

	&:disabled {
		&::-webkit-slider-thumb {
			background-color: @custom-range-thumb-disabled-bg;
		}

		&::-webkit-slider-runnable-track {
			cursor: default;
		}

		&::-moz-range-thumb {
			background-color: @custom-range-thumb-disabled-bg;
		}

		&::-moz-range-track {
			cursor: default;
		}

		&::-ms-thumb {
			background-color: @custom-range-thumb-disabled-bg;
		}
	}
}

.custom-control-label::before,
.custom-file-label,
.custom-select {
	#transition(@custom-forms-transition);
}