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twbs--bootstrap/scss/_button-group.scss

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// Make the div behave like a button
.btn-group,
.btn-group-vertical {
position: relative;
display: inline-flex;
vertical-align: middle; // match .btn alignment given font-size hack above
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> .btn {
position: relative;
flex: 1 1 auto;
}
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// Bring the hover, focused, and "active" buttons to the front to overlay
// the borders properly
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> .btn-check:checked + .btn,
> .btn-check:focus + .btn,
> .btn:hover,
> .btn:focus,
> .btn:active,
> .btn.active {
z-index: 1;
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}
}
// Optional: Group multiple button groups together for a toolbar
.btn-toolbar {
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display: flex;
flex-wrap: wrap;
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justify-content: flex-start;
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.input-group {
width: auto;
}
}
.btn-group {
// Prevent double borders when buttons are next to each other
> .btn:not(:first-child),
> .btn-group:not(:first-child) {
margin-left: -$btn-border-width;
}
// Reset rounded corners
> .btn:not(:last-child):not(.dropdown-toggle),
> .btn-group:not(:last-child) > .btn {
@include border-end-radius(0);
}
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// The left radius should be 0 if the button is:
// - the "third or more" child
// - the second child and the previous element isn't `.btn-check` (making it the first child visually)
// - part of a btn-group which isn't the first child
> .btn:nth-child(n + 3),
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> :not(.btn-check) + .btn,
> .btn-group:not(:first-child) > .btn {
@include border-start-radius(0);
}
}
// Sizing
//
// Remix the default button sizing classes into new ones for easier manipulation.
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.btn-group-sm > .btn { @extend .btn-sm; }
.btn-group-lg > .btn { @extend .btn-lg; }
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//
// Split button dropdowns
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//
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.dropdown-toggle-split {
padding-right: $btn-padding-x * .75;
padding-left: $btn-padding-x * .75;
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&::after,
.dropup &::after,
.dropend &::after {
margin-left: 0;
}
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.dropstart &::before {
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margin-right: 0;
}
}
.btn-sm + .dropdown-toggle-split {
padding-right: $btn-padding-x-sm * .75;
padding-left: $btn-padding-x-sm * .75;
}
.btn-lg + .dropdown-toggle-split {
padding-right: $btn-padding-x-lg * .75;
padding-left: $btn-padding-x-lg * .75;
}
// The clickable button for toggling the menu
// Set the same inset shadow as the :active state
.btn-group.show .dropdown-toggle {
@include box-shadow($btn-active-box-shadow);
// Show no shadow for `.btn-link` since it has no other button styles.
&.btn-link {
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@include box-shadow(none);
}
}
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//
// Vertical button groups
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//
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.btn-group-vertical {
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flex-direction: column;
align-items: flex-start;
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justify-content: center;
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> .btn,
> .btn-group {
width: 100%;
}
> .btn:not(:first-child),
> .btn-group:not(:first-child) {
margin-top: -$btn-border-width;
}
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// Reset rounded corners
> .btn:not(:last-child):not(.dropdown-toggle),
> .btn-group:not(:last-child) > .btn {
@include border-bottom-radius(0);
}
> .btn ~ .btn,
> .btn-group:not(:first-child) > .btn {
@include border-top-radius(0);
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}
}