maitsevkimp.ee/resources/scss/core/mixins/_buttons.scss

// Button variants
//
// Easily pump out default styles, as well as :hover, :focus, :active,
// and disabled options for all buttons

@mixin button-variant($background, $border, $hover-background: darken($background, 7.5%), $hover-border: darken($border, 10%), $active-background: darken($background, 10%), $active-border: darken($border, 12.5%)) {
    color: color-yiq($background);
    @include gradient-bg($background);
    border-color: $border;
    @include box-shadow($btn-box-shadow);

    @include hover {
        color: color-yiq($hover-background);
        @include gradient-bg($hover-background);
        border-color: $hover-border;
    }

    &:focus,
    &.focus {
        // Avoid using mixin so we can pass custom focus shadow properly
        @if $enable-shadows {
            box-shadow: $btn-box-shadow, 0 0 $btn-focus-width rgba($background, .35);
        } @else {
            box-shadow: 0 0 $btn-focus-width rgba($background, .35);
        }
    }

    // Disabled comes first so active can properly restyle
    &.disabled,
    &:disabled {
        color: color-yiq($background);
        background-color: $background;
        border-color: $border;
        // Remove CSS gradients if they're enabled
        @if $enable-gradients {
            background-image: none;
        }
    }

    &:not(:disabled):not(.disabled):active,
    &:not(:disabled):not(.disabled).active,
    .show > &.dropdown-toggle {
        color: color-yiq($active-background);
        background-color: $active-background;
        @if $enable-gradients {
            background-image: none; // Remove the gradient for the pressed/active state
        }
        border-color: $active-border;

        &:focus {
            // Avoid using mixin so we can pass custom focus shadow properly
            @if $enable-shadows and $btn-active-box-shadow != none {
                box-shadow: $btn-active-box-shadow, 0 0 $btn-focus-width rgba($background, .35);
            } @else {
                box-shadow: 0 0 $btn-focus-width rgba($background, .35);
            }
        }
    }
}

// Button outline variants
//

@mixin button-outline-variant($color, $color-hover: color-yiq($color), $active-background: $color, $active-border: $color) {
    color: $color;
    border-color: $color;

    @include hover {
        color: $color-hover;
        background-color: $active-background;
        border-color: $active-border;
    }

    &:focus,
    &.focus {
        box-shadow: $btn-box-shadow, 0 0 $btn-focus-width rgba($color, .35);
    }

    &.disabled,
    &:disabled {
        color: $color;
        background-color: transparent;
    }

    &:not(:disabled):not(.disabled):active,
    &:not(:disabled):not(.disabled).active,
    .show > &.dropdown-toggle {
        color: color-yiq($active-background);
        background-color: $active-background;
        border-color: $active-border;

        &:focus {
            // Avoid using mixin so we can pass custom focus shadow properly
            @if $enable-shadows and $btn-active-box-shadow != none {
                box-shadow: $btn-active-box-shadow, 0 0 $btn-focus-width rgba($color, .35);
            } @else {
                box-shadow: 0 0 $btn-focus-width rgba($color, .35);
            }
        }
    }
}

// Button soft variants
//
// Easily pump out default styles, as well as :hover, :focus, :active,
// and disabled options for all buttons

@mixin button-soft-variant($background, $color, $hover-background: $color, $hover-color: color-yiq($color), $active-background: $color, $active-color: color-yiq($color)) {
    color: $color;
    @include gradient-bg($background);
    border-color: $background;
    @include box-shadow($btn-box-shadow);

    @include hover {
        color: $hover-color;
        @include gradient-bg($hover-background);
        border-color: $hover-background;
        @include box-shadow(0 4px 11px rgba($background, .35));
    }

    &:focus,
    &.focus {
        // Avoid using mixin so we can pass custom focus shadow properly
        @if $enable-shadows {
            box-shadow: $btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $color, 15%), .5);
        } @else {
            box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $color, 15%), .5);
        }
    }

    // Disabled comes first so active can properly restyle
    &.disabled,
    &:disabled {
        color: $color;
        background-color: $background;
        border-color: $background;
        // Remove CSS gradients if they're enabled
        @if $enable-gradients {
            background-image: none;
        }
    }

    &:not(:disabled):not(.disabled):active,
    &:not(:disabled):not(.disabled).active,
    .show > &.dropdown-toggle {
        color: $active-color;
        background-color: $active-background;
        @if $enable-gradients {
            background-image: none; // Remove the gradient for the pressed/active state
        }
        border-color: $active-background;

        &:focus {
            // Avoid using mixin so we can pass custom focus shadow properly
            @if $enable-shadows {
                box-shadow: $btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $color, 15%), .5);
            } @else {
                box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $color, 15%), .5);
            }
        }
    }
}