numix-blue-gtk-theme/gtk-3.0/scss/widgets/_toggle.scss

/***********************
 ! Check and Radio items
************************/

@mixin toggle($type) {
	background-image: none;

	-gtk-icon-source: url('../assets/#{$type}-unchecked.svg');

	&:insensitive { -gtk-icon-source: url('../assets/#{$type}-unchecked-insensitive.svg'); }

	&:checked, &:active {
		-gtk-icon-source: url('../assets/#{$type}-checked.svg');

		&:insensitive { -gtk-icon-source: url('../assets/#{$type}-checked-insensitive.svg'); }
	}

	&:inconsistent {
		-gtk-icon-source: url('../assets/#{$type}-mixed.svg');

		&:insensitive { -gtk-icon-source: url('../assets/#{$type}-mixed-insensitive.svg'); }
	}

	&.menuitem {
		-gtk-icon-source: none;

		&:insensitive { -gtk-icon-source: none; }

		&:checked, &:active {
			-gtk-icon-source: url('../assets/menuitem-#{$type}-checked.svg');

			&:hover { -gtk-icon-source: url('../assets/menuitem-#{$type}-checked-hover.svg'); }

			&:insensitive { -gtk-icon-source: url('../assets/menuitem-#{$type}-checked-insensitive.svg'); }
		}

		&:inconsistent {
			-gtk-icon-source: url('../assets/menuitem-#{$type}-mixed.svg');

			&:hover { -gtk-icon-source: url('../assets/menuitem-#{$type}-mixed-hover.svg'); }

			&:insensitive { -gtk-icon-source: url('../assets/menuitem-#{$type}-mixed-insensitive.svg'); }
		}
	}
}

@include exports("checkradio") {
	* {
		-GtkCheckButton-indicator-size: 16;
		-GtkCheckMenuItem-indicator-size: 14;
	}

	.radio { @include toggle("radio"); }

	.check { @include toggle("checkbox"); }

	GtkIconView.content-view.cell.check {
		-gtk-icon-source: url("assets/grid-selection-unchecked.svg");

		&:active { -gtk-icon-source: url("assets/grid-selection-checked.svg"); }
	}
}


/********
 ! Switch
*********/

@include exports("switch") {
	GtkSwitch {
		padding: 0;
		border-radius: $roundness;
		font: bold condensed;
		outline-offset: -4px;

		&.slider {
			border: 1px solid border_normal($bg_color);
			background-color: shade($bg_color, 1.08);

			&:insensitive {
				border-color: border_insensitive($bg_color);
				background-color: shade($bg_color, 0.9);
			}
		}

		&.trough {
			border: 1px solid border_normal($bg_color);
			background-color: shade($bg_color, 0.95);
			color: $fg_color;

			&:active {
				border-color: shade($selected_bg_color, 0.9);
				background-color: $selected_bg_color;
				color: $selected_fg_color;
			}

			&:insensitive {
				border-color: border_insensitive($bg_color);
				background-color: shade($bg_color, 0.9);
				color: mix($fg_color, $bg_color, 0.5);
			}
		}
	}
}