@progress/kendo-ui/css/web/common/button.less

This package is part of the [Kendo UI for jQuery](http://www.telerik.com/kendo-ui) suite.

/*!
 * Copyright 2019 Progress Software Corporation and/or one of its subsidiaries or affiliates. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// Button
.k-button {
    margin: 0;
    padding: @button-padding;
    box-sizing: border-box;
    border-width: 1px;
    border-style: solid;
    background-repeat: repeat-x;
    background-position: 0 center;
    font: inherit;
    line-height: @button-line-height;
    text-align: center;
    text-decoration: none;
    display: inline-flex;
    overflow: hidden;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
    user-select: none;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    position: relative;

    // No flexbox
    .k-no-flexbox & {
        display: inline-block;
    }

    &::-moz-focus-inner {
        padding: 0;
        border: 0;
        outline: 0;
    }

    &:hover,
    &:focus {
        text-decoration: none;
        outline: 0;
    }

    .k-text {
        overflow: hidden;
    }

    .k-icon,
    .k-image,
    .k-sprite {
        color: inherit;
        align-self: center;
        pointer-events: none;
    }


    // Button variants
    &-icontext {
        overflow: visible; // IE9

        .k-icon,
        .k-image,
        .k-sprite {
            margin-right: 3px;
            margin-right: .1875em;
            margin-left: -2px;
            margin-left: -.125em;
        }
    }

    // Disabled state
    &[disabled],
    .k-state-disabled &,
    &.k-state-disabled {
        cursor: default;
        outline: 0;
        box-shadow: none;
        opacity: @disabled-button-opacity;
    }

}

.k-ie9 .k-button {
    display: inline-block;
}

a.k-button-expand {
    display: block;
}

button.k-button-expand,
input[type="submit"].k-button-expand,
input[type="button"].k-button-expand,
input[type="reset"].k-button-expand {
    width: 100%;
}

// TODO improve elastic behavior
.k-button-icon {
    height: ~"calc(@{button-line-height}em + (2*@{button-padding-y}) + 2px)"; // proper vertical alignment for elastic behavior
}
.k-split-button-arrow {
    display: inline-block; // fix height
}
.k-button-icon,
.k-split-button-arrow {
    width: ~"calc(@{button-line-height}em + (2*@{button-padding-y}) + 2px)";
    padding: @button-padding-y calc(@button-padding-x/2);
}
.k-overflow-group .k-button-icon {
    width: auto;
}




// Flat button and bare
.k-button.k-flat,
.k-button.k-bare {
    border-color: transparent !important; // sass-lint:disable-line no-important
    color: inherit;
    background: none !important; // sass-lint:disable-line no-important
    box-shadow: none !important; // sass-lint:disable-line no-important
    transition: color .2s ease-in-out;

    &:hover,
    &.k-state-hover,
    &:active,
    &.k-state-active,
    &:hover:active,
    &:hover.k-state-active {
        color: inherit;
    }

    &::before {
        display: block;
    }

    &::after {
        display: block;
    }

    &:focus,
    &.k-state-focused {

        &::after {
            box-shadow: inset 0 0 0 2px currentColor;
            opacity: .12;
        }
    }

    &[disabled],
    .k-state-disabled &,
    &.k-state-disabled {
        pointer-events: none;
    }
}




// Thin background
@flat-button-hover-opacity: .08;
@flat-button-focused-opacity: null;
@flat-button-active-opacity: .16;
@flat-button-selected-opacity: .2;
.k-button {

    &::before {
        .border-radius(inherit);
        content: "";
        background: currentColor;
        opacity: 0;
        display: none;
        pointer-events: none;
        position: absolute;
        // left: -@button-border-width;
        // right: -@button-border-width;
        // top: -@button-border-width;
        // bottom: -@button-border-width;
        left: 0;
        right: 0;
        top: 0;
        bottom: 0;
        z-index: 0;
        transition: opacity .2s ease-in-out;
    }

    // Hovered state
    &:hover,
    &.k-state-hover {
        &::before {
            // .opacity( @flat-button-hover-opacity );
            opacity: @flat-button-hover-opacity;
        }
    }

    // Focused state
    &:focus,
    &.k-state-focused {
        &::before {
            // .opacity( @flat-button-focused-opacity );
            // opacity: @flat-button-focused-opacity;
        }
    }
    &.k-no-focus:not(:hover),
    &.k-no-focus:not(.k-state-hover) {
        &::before {
            // .opacity( 0 );
            opacity: 0;
        }
    }

    // Pressed state
    &:active,
    &.k-state-active {
        &::before {
            // opacity( @flat-button-active-opacity );
            opacity: @flat-button-active-opacity;
        }
    }

    // Selected state
    &.k-state-selected {
        &::before {
            // .opacity( @flat-button-selected-opacity );
            opacity: @flat-button-selected-opacity;
        }
    }
}




// Focus ring
.k-button {

    &::after {
        .border-radius(inherit);
        content: "";
        opacity: 0;
        display: none;
        pointer-events: none;
        position: absolute;
        // left: -@button-border-width;
        // right: -@button-border-width;
        // top: -@button-border-width;
        // bottom: -@button-border-width;
        left: 0;
        right: 0;
        top: 0;
        bottom: 0;
        z-index: 0;
        transition: opacity .2s ease-in-out;
    }
}




// Button group
.k-button-group {
    margin: 0;
    padding: 0;
    border-width: 0;
    list-style: none;
    white-space: nowrap;
    display: inline-flex;
    flex-direction: row;
    vertical-align: middle;
    position: relative;
    flex-wrap: nowrap;

    .k-button {
        // .border-radius( 0 );
        position: relative;
    }
    .k-button + .k-button {
        margin-left: -1px;
    }

    // stretched button group
    &.k-button-group-stretched {

        .k-button {
            flex: 1 0 auto;
        }
    }

    .k-button:active,
    .k-button.k-state-active {
        z-index: 2;
    }
    .k-button:hover,
    .k-button.k-state-hover {
        z-index: 3;
    }
    .k-button.k-state-disabled,
    &.k-state-disabled .k-button {
        z-index: auto;
    }
    .k-button:focus,
    .k-button.k-state-focused {
        z-index: 4;
    }

    .k-group-start,
    .k-button:first-child {
        // .border-left-radius();
    }
    .k-group-end,
    .k-button:last-child {
        // .border-right-radius();
    }
    .k-group-start.k-group-end,
    .k-button:first-child:last-child {
        // .border-radius();
    }

    > input[type="radio"],
    > input[type="checkbox"],
    label input[type="radio"],
    label input[type="checkbox"] {
        margin: 0;
        padding: 0;
        clip: rect(0, 0, 0, 0);
        position: absolute;
        pointer-events: none;
    }

}

.k-overflow-container .k-overflow-tool-group {
    display: block;
}

.k-rtl .k-button-group {

    .k-button {
        margin-left: 0;
    }
    .k-button + .k-button {
        margin-right: -1px;
    }

}
.k-no-flexbox .k-button-group {
    display: inline-block;

    &:after {
        content: "";
        display: block;
        clear: both;
    }

    .k-button {
        display: inline-block;
        vertical-align: top;
    }
}




// Action buttons
.k-action-buttons {
    margin: 1em 0 0;
    padding: 6px 8px;
    text-align: right;
    position: relative;
    clear: both;

    .k-button {
        min-width: 75px;
    }
    .k-button + .k-button {
        margin-left: 6px;
    }
    .k-button.k-left {
        float: left;
        margin: 0 0 0 1em;
    }
}