bootstrap-less-port/less/_modal.less

A Less port of Bootstrap v4

// .modal-open      - body class for killing the scroll
// .modal           - container to scroll within
// .modal-dialog    - positioning shell for the actual modal
// .modal-content   - actual modal w/ bg and corners and stuff


.modal-open {
	// Kill the scroll on the body
	overflow: hidden;

	.modal {
		overflow-x: hidden;
		overflow-y: auto;
	}
}

// Container that the modal scrolls within
.modal {
	position: fixed;
	top: 0;
	left: 0;
	z-index: @zindex-modal;
	display: none;
	width: 100%;
	height: 100%;
	overflow: hidden;
	// Prevent Chrome on Windows from adding a focus outline. For details, see
	// https://github.com/twbs/bootstrap/pull/10951.
	outline: 0;
	// We deliberately don't use `-webkit-overflow-scrolling: touch;` due to a
	// gnarly iOS Safari bug: https://bugs.webkit.org/show_bug.cgi?id=158342
	// See also https://github.com/twbs/bootstrap/issues/17695
}

// Shell div to position the modal with bottom padding
.modal-dialog {
	position: relative;
	width: auto;
	margin: @modal-dialog-margin;
	// allow clicks to pass through for custom click handling to close modal
	pointer-events: none;

	// When fading in the modal, animate it to slide down
	.modal.fade & {
		#transition(@modal-transition);
		transform: @modal-fade-transform;
	}
	.modal.show & {
		transform: @modal-show-transform;
	}

	// When trying to close, animate focus to scale
	.modal.modal-static & {
		transform: @modal-scale-transform;
	}
}

.modal-dialog-scrollable {
	display: flex; // IE10/11
	max-height: subtract(100%, (@modal-dialog-margin * 2));

	.modal-content {
		max-height: subtract(100vh, (@modal-dialog-margin * 2)); // IE10/11
		overflow: hidden;
	}

	.modal-header,
	.modal-footer {
		flex-shrink: 0;
	}

	.modal-body {
		overflow-y: auto;
	}
}

.modal-dialog-centered {
	display: flex;
	align-items: center;
	min-height: subtract(100%, (@modal-dialog-margin * 2));

	// Ensure `modal-dialog-centered` extends the full height of the view (IE10/11)
	&::before {
		display: block; // IE10
		height: subtract(100vh, (@modal-dialog-margin * 2));
		height: min-content; // Reset height to 0 except on IE
		content: "";
	}

	// Ensure `.modal-body` shows scrollbar (IE10/11)
	&.modal-dialog-scrollable {
		flex-direction: column;
		justify-content: center;
		height: 100%;

		.modal-content {
			max-height: none;
		}

		&::before {
			content: none;
		}
	}
}

// Actual modal
.modal-content {
	position: relative;
	display: flex;
	flex-direction: column;
	width: 100%; // Ensure `.modal-content` extends the full width of the parent `.modal-dialog`
	// counteract the pointer-events: none; in the .modal-dialog
	// LESS PORT: Less doesn’t strip “empty” property values so we have to check for a value first.
	& when not (@modal-content-color = ~"") { color: @modal-content-color; }
	pointer-events: auto;
	background-color: @modal-content-bg;
	background-clip: padding-box;
	border: @modal-content-border-width solid @modal-content-border-color;
	#border-radius(@modal-content-border-radius);
	#box-shadow(@modal-content-box-shadow-xs);
	// Remove focus outline from opened modal
	outline: 0;
}

// Modal background
.modal-backdrop {
	position: fixed;
	top: 0;
	left: 0;
	z-index: @zindex-modal-backdrop;
	width: 100vw;
	height: 100vh;
	background-color: @modal-backdrop-bg;

	// Fade for backdrop
	&.fade { opacity: 0; }
	&.show { opacity: @modal-backdrop-opacity; }
}

// Modal header
// Top section of the modal w/ title and dismiss
.modal-header {
	display: flex;
	align-items: flex-start; // so the close btn always stays on the upper right corner
	justify-content: space-between; // Put modal header elements (title and dismiss) on opposite ends
	padding: @modal-header-padding;
	border-bottom: @modal-header-border-width solid @modal-header-border-color;
	#border-top-radius(@modal-content-inner-border-radius);

	.close {
		padding: @modal-header-padding;
		// auto on the left force icon to the right even when there is no .modal-title
		margin: (-@modal-header-padding-y) (-@modal-header-padding-x) (-@modal-header-padding-y) auto;
	}
}

// Title text within header
.modal-title {
	margin-bottom: 0;
	line-height: @modal-title-line-height;
}

// Modal body
// Where all modal content resides (sibling of .modal-header and .modal-footer)
.modal-body {
	position: relative;
	// Enable `flex-grow: 1` so that the body take up as much space as possible
	// when there should be a fixed height on `.modal-dialog`.
	flex: 1 1 auto;
	padding: @modal-inner-padding;
}

// Footer (for actions)
.modal-footer {
	display: flex;
	flex-wrap: wrap;
	align-items: center; // vertically center
	justify-content: flex-end; // Right align buttons with flex property because text-align doesn't work on flex items
	padding: (@modal-inner-padding - @modal-footer-margin-between / 2);
	border-top: @modal-footer-border-width solid @modal-footer-border-color;
	#border-bottom-radius(@modal-content-inner-border-radius);

	// Place margin between footer elements
	// This solution is far from ideal because of the universal selector usage,
	// but is needed to fix https://github.com/twbs/bootstrap/issues/24800
	> * {
		margin: (@modal-footer-margin-between / 2);
	}
}

// Measure scrollbar width for padding body during modal show/hide
.modal-scrollbar-measure {
	position: absolute;
	top: -9999px;
	width: 50px;
	height: 50px;
	overflow: scroll;
}

// Scale up the modal
#media-breakpoint-up(sm, {
	// Automatically set modal's width for larger viewports
	.modal-dialog {
		max-width: @modal-md;
		margin: @modal-dialog-margin-y-sm-up auto;
	}

	.modal-dialog-scrollable {
		max-height: subtract(100%, (@modal-dialog-margin-y-sm-up * 2));

		.modal-content {
			max-height: subtract(100vh, (@modal-dialog-margin-y-sm-up * 2));
		}
	}

	.modal-dialog-centered {
		min-height: subtract(100%, (@modal-dialog-margin-y-sm-up * 2));

		&::before {
			height: subtract(100vh, (@modal-dialog-margin-y-sm-up * 2));
			height: min-content;
		}
	}

	.modal-content {
		#box-shadow(@modal-content-box-shadow-sm-up);
	}

	.modal-sm { max-width: @modal-sm; }
});

#media-breakpoint-up(lg, {
	.modal-lg,
	.modal-xl {
		max-width: @modal-lg;
	}
});

#media-breakpoint-up(xl, {
	.modal-xl { max-width: @modal-xl; }
});