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//-----------------------------------------------
// Variables
//-----------------------------------------------
$ui-corners-cache-buster: true !default;

// default widths
$ui-corners-corner-height: 10px !default;
$ui-corners-corner-width: 10px !default;
$ui-corners-side-width: 10px !default;

// defaults per corner
$ui-corners-corner-tl-height: $ui-corners-corner-height !default;
$ui-corners-corner-tl-width: $ui-corners-corner-width !default;
$ui-corners-corner-tr-height: $ui-corners-corner-height !default;
$ui-corners-corner-tr-width: $ui-corners-corner-width !default;
$ui-corners-corner-br-height: $ui-corners-corner-height !default;
$ui-corners-corner-br-width: $ui-corners-corner-width !default;
$ui-corners-corner-bl-height: $ui-corners-corner-height !default;
$ui-corners-corner-bl-width: $ui-corners-corner-width !default;

// defaults per side
$ui-corners-side-top-width: $ui-corners-side-width !default;
$ui-corners-side-bottom-width: $ui-corners-side-width !default;
$ui-corners-side-left-width: $ui-corners-side-width !default;
$ui-corners-side-right-width: $ui-corners-side-width !default;

//-----------------------------------------------
// Corner Border Width
// Adds padding to the corner container to simulate a border
// The second parameter allows for setting an inner padding in addition to the border
// @param list $width border-width list: [top] [right] [bottom] [left]
// @param list $padding (optional) padding list: [top] [right] [bottom] [left]
//-----------------------------------------------
@mixin corner-border-width ($border-width, $padding: false) {
  @if $padding {
    $border-width: corner-zip-widths($border-width, $padding);
  }
  &.ui-corners { padding: $border-width; }
}

//-----------------------------------------------
// Corner Zip Widths
// returns a list of the two lists added together
// @param list $a list of widths: [top] [right] [bottom] [left]
// @param list $b (optional) list of widths: [top] [right] [bottom] [left]
// @return list
//-----------------------------------------------
@function corner-zip-widths($a, $b: 0) {
  $a-t: corner-nth($a, 1, 0);
  $a-r: corner-nth($a, 2, $a-t);
  $a-b: corner-nth($a, 3, $a-t);
  $a-l: corner-nth($a, 4, $a-r);
  
  $b-t: corner-nth($b, 1, 0);
  $b-r: corner-nth($b, 2, $b-t);
  $b-b: corner-nth($b, 3, $b-t);
  $b-l: corner-nth($b, 4, $b-r);
  
  $a-t: $a-t + $b-t;
  $a-r: $a-r + $b-r;
  $a-b: $a-b + $b-b;
  $a-l: $a-l + $b-l;
  
  @if $a-t == $a-b and $a-r == $a-l and $a-t == $a-r {
    @return $a-t; // all equal
  } @elseif $a-t == $a-b and $a-r == $a-l and $a-t != $a-r {
    @return $a-t $a-r; // x and y different
  } @elseif $a-t != $a-b and $a-r == $a-l {
    @return $a-t $a-r $a-b; // y different
  } @else {
    @return $a-t $a-r $a-b $a-l;// all different
  }
}

//-----------------------------------------------
// Corner Images
// @param list $tl [background-image] [width] [height] [background-position-x] [background-position-y] [left] [top] top-left corner
// @param list $t [background-image] [height] [background-position-x] [background-position-y] [left] [right] [top] top side
// @param list $tr [background-image] [width] [height] [background-position-x] [background-position-y] [right] [top] top-right corner
// @param list $r [background-image] [width] [background-position-x] [background-position-y] [right] [top] [bottom] right side
// @param list $br [background-image] [width] [height] [background-position-x] [background-position-y] [right] [bottom] bottom-right corner
// @param list $b [background-image] [height] [background-position-x] [background-position-y] [left] [right] [bottom] bottom side
// @param list $bl [background-image] [width] [height] [background-position-x] [background-position-y] [left] [bottom] bottom-left corner
// @param list $l [background-image] [width] [background-position-x] [background-position-y] [left] [top] [bottom] left side
//-----------------------------------------------
@mixin corner-images ($tl: auto, $t: auto, $tr: auto, $r: auto, $br: auto, $b: auto, $bl: auto, $l: auto) {
  // corner images and dimensions
  $tl-image: nth($tl, 1);
  $tl-width: corner-var(corner-nth($tl, 2, auto) corner-image-width($tl-image) $ui-corners-corner-tl-width);
  $tl-height: corner-var(corner-nth($tl, 3, auto) corner-image-height($tl-image) $ui-corners-corner-tl-height);
  $tr-image: nth($tr, 1);
  $tr-width: corner-var(corner-nth($tr, 2, auto) corner-image-width($tr-image) $ui-corners-corner-tr-width);
  $tr-height: corner-var(corner-nth($tr, 3, auto) corner-image-height($tr-image) $ui-corners-corner-tr-height);
  $br-image: nth($br, 1);
  $br-width: corner-var(corner-nth($br, 2, auto) corner-image-width($br-image) $ui-corners-corner-br-width);
  $br-height: corner-var(corner-nth($br, 3, auto) corner-image-height($br-image) $ui-corners-corner-br-height);
  $bl-image: nth($bl, 1);
  $bl-width: corner-var(corner-nth($bl, 2, auto) corner-image-width($bl-image) $ui-corners-corner-bl-width);
  $bl-height: corner-var(corner-nth($bl, 3, auto) corner-image-height($bl-image) $ui-corners-corner-bl-height);
  $t-image: nth($t, 1); $r-image: nth($r, 1); $b-image: nth($b, 1); $l-image: nth($l, 1);
  
  // all backgrounds are the same
  @if $tl-image != none and $tl-image == $t-image and $tl-image == $tr-image and $tl-image == $r-image
      and $tl-image == $br-image and $tl-image == $b-image and $tl-image == $b-image and $tl-image == $l-image {
    .ui-corners-corner, .ui-corners-side { background-image: image-url($tl-image, false, $ui-corners-cache-buster); }
    $tl-image: none; $tr-image: none; $br-image: none; $bl-image: none;
    $t-image: none; $r-image: none; $b-image: none; $l-image: none;
  }
  
  // normalize height and width
  $width: false;
  $height: false;
  
  // check all width are the same
  @if $tl-width == $tr-width and $tl-width == $br-width and $tl-width == $bl-width { $width: $tl-width; }
  
  // check all heights are the same
  @if $tl-height == $tr-height and $tl-height == $br-height and $tl-height == $bl-height { $height: $tl-height; }
  
  // set the width and height with a generic class
  @if ($width and $width != $ui-corners-corner-width) or ($height and $height != $ui-corners-corner-height)
    or ($tl-image != none and $tl-image == $tr-image and $tl-image == $br-image and $tl-image == $bl-image) {
    // when it matches default, fall back to generic corner class
    .ui-corners-corner {
      @if $width and $width != $ui-corners-corner-width { width: $width; }
      @if $height and $height != $ui-corners-corner-height { height: $height; }
      @if $tl-image != none and $tl-image == $tr-image and $tl-image == $br-image and $tl-image == $bl-image {
        background-image: image-url($tl-image, false, $ui-corners-cache-buster);
        $tl-image: none; $tr-image: none; $br-image: none; $bl-image: none;
      }
    }
  }
  
  // Top Left
  @if $tl != auto {
    .ui-corners-corner-tl {
      @include corner-props(
        $image: $tl-image,
        $w: if($width, false, $tl-width),
        $h: if($height, false, $tl-height),
        $x: corner-nth($tl, 4, auto) false 0,
        $y: corner-nth($tl, 5, auto) false 0,
        $l: corner-nth($tl, 6, auto) false 0,
        $t: corner-nth($tl, 7, auto) false 0
      );
    }
  }
  
  // Top Right
  @if $tr != auto {
    .ui-corners-corner-tr {
      @include corner-props(
        $image: $tr-image,
        $w: if($width, false, $tr-width),
        $h: if($height, false, $tr-height),
        $x: corner-nth($tr, 4, auto) false 0,
        $y: corner-nth($tr, 5, auto) false 0,
        $r: corner-nth($tr, 6, auto) false 0,
        $t: corner-nth($tr, 7, auto) false 0
      );
    }
  }
  
  // Bottom Right
  @if $br != auto {
    .ui-corners-corner-br {
      @include corner-props(
        $image: $br-image,
        $w: if($width, false, $br-width),
        $h: if($height, false, $br-height),
        $x: corner-nth($br, 4, auto) false 0,
        $y: corner-nth($br, 5, auto) false 0,
        $r: corner-nth($br, 6, auto) false 0,
        $b: corner-nth($br, 7, auto) false 0
      );
    }
  }
  
  // Bottom Left
  @if $bl != auto {
    .ui-corners-corner-bl {
      @include corner-props(
        $image: $bl-image,
        $w: if($width, false, $bl-width),
        $h: if($height, false, $bl-height),
        $x: corner-nth($bl, 4, auto) false 0,
        $y: corner-nth($bl, 5, auto) false 0,
        $l: corner-nth($bl, 6, auto) false 0,
        $b: corner-nth($bl, 7, auto) false 0
      );
    }
  }
  
  // Side left, right, top and bottom
  $t-height: corner-var(corner-nth($t, 2, auto) $tl-height $ui-corners-side-left-width);
  $t-left: corner-var(corner-nth($t, 6, auto) ($tl-width + corner-nth($tl, 6, 0)) $ui-corners-corner-width);
  $t-right: corner-var(corner-nth($t, 7, auto) ($tr-width + corner-nth($tr, 6, 0)) $ui-corners-corner-width);
  $b-height: corner-var(corner-nth($b, 2, auto) $bl-height $ui-corners-side-left-width);
  $b-left: corner-var(corner-nth($b, 6, auto) ($bl-width + corner-nth($bl, 6, 0)) $ui-corners-corner-width);
  $b-right: corner-var(corner-nth($b, 7, auto) ($br-width + corner-nth($br, 6, 0)) $ui-corners-corner-width);
  $l-width: corner-var(corner-nth($l, 2, auto) $tl-width $ui-corners-side-left-width);
  $l-top: corner-var(corner-nth($l, 6, auto) ($tl-height + corner-nth($tl, 7, 0)) $ui-corners-corner-height);
  $l-bottom: corner-var(corner-nth($l, 7, auto) ($bl-height + corner-nth($bl, 7, 0)) $ui-corners-corner-height);
  $r-width: corner-var(corner-nth($r, 2, auto) $tr-width $ui-corners-side-right-width);
  $r-top: corner-var(corner-nth($r, 6, auto) ($tr-height + corner-nth($tr, 7, 0)) $ui-corners-corner-height);
  $r-bottom: corner-var(corner-nth($r, 7, auto) ($br-height + corner-nth($br, 7, 0)) $ui-corners-corner-height);
  
  // normalize left and right, top and bottom
  $left: false;
  $right: false;
  $top: false;
  $bottom: false;
  $width: false;
  $height: false;
  
  // check all sides are the same
  @if $t-left == $b-left { $left: $t-left; }
  @if $t-right == $b-right { $right: $t-right; }
  @if $t-height == $b-height { $height: $t-height; }
  @if $l-top == $r-top { $top: $l-top; }
  @if $l-bottom == $r-bottom { $bottom: $l-bottom; }
  @if $l-width == $r-width { $width: $l-width; }
  
  @if $t-image != none and $t-image == $r-image and $t-image == $b-image and $t-image == $l-image {
    .ui-corners-side { background-image: image-url($t-image, false, $ui-corners-cache-buster); }
    $t-image: none; $r-image: none; $b-image: none; $l-image: none;
  }
  
  // set the top and bottom sides with a generic class
  @if ($left and $left != $ui-corners-corner-width) or ($right and $right != $ui-corners-corner-width)
      or ($height and $height != $ui-corners-side-width) or ($t-image != none and $t-image == $b-image) {
    // when it matches default, fall back to generic corner class
    .ui-corners-side-top, .ui-corners-side-bottom {
      @if $left and $left != $ui-corners-corner-width { left: $left; }
      @if $right and $right != $ui-corners-corner-width { right: $right; }
      @if $height and $height != $ui-corners-side-width { height: $height; }
      @if $t-image != none and $t-image == $b-image { background-image: image-url($t-image, false, $ui-corners-cache-buster); $t-image: none; $b-image: none; }
    }
  }
  
  // set the left and right sides with a generic class
  @if ($top and $top != $ui-corners-corner-height) or ($bottom and $bottom != $ui-corners-corner-height)
      or ($width and $width != $ui-corners-side-width) or ($l-image != none and $l-image == $r-image) {
    // when it matches default, fall back to generic corner class
    .ui-corners-side-left, .ui-corners-side-right {
      @if $top and $top != $ui-corners-corner-height { top: $top; }
      @if $bottom and $bottom != $ui-corners-corner-height { bottom: $bottom; }
      @if $width and $width != $ui-corners-side-width { width: $width; }
      @if $l-image != none and $l-image == $r-image { background-image: image-url($l-image, false, $ui-corners-cache-buster); $l-image: none; $r-image: none; }
    }
  }
  
  // Top
  @if $t != auto {
    .ui-corners-side-top {
      @include corner-props(
        $image: $t-image,
        $h: if($height, false, $t-height),
        $x: corner-nth($t, 3, auto) false left,
        $y: corner-nth($t, 4, auto) false top,
        $l: if($left, false, $t-left),
        $r: if($right, false, $t-right) + corner-nth($tr, 6, 0),
        $t: corner-nth($t, 5, auto) false 0
      );
    }
  }
  
  // Bottom
  @if $b != auto {
    .ui-corners-side-bottom {
      @include corner-props(
        $image: $b-image,
        $h: if($height, false, $b-height),
        $x: corner-nth($b, 3, auto) false left,
        $y: corner-nth($b, 4, auto) false bottom,
        $l: if($left, false, $b-left),
        $r: if($right, false, $b-right),
        $b: corner-nth($b, 5, auto) false 0
      );
    }
  }
  
  // Left
  @if $l != auto {
    .ui-corners-side-left {
      @include corner-props(
        $image: $l-image,
        $w: if($width, false, $l-width),
        $x: corner-nth($l, 3, auto) false left,
        $y: corner-nth($l, 4, auto) false top,
        $l: corner-nth($l, 5, auto) false 0,
        $t: if($top, false, $l-top),
        $b: if($bottom, false, $l-bottom)
      );
    }
  }
  
  // Right
  @if $r != auto {
    .ui-corners-side-right {
      @include corner-props(
        $image: $r-image,
        $w: if($width, false, $r-width),
        $x: corner-nth($r, 3, auto) false right,
        $y: corner-nth($r, 4, auto) false top,
        $r: corner-nth($r, 5, auto) false 0,
        $t: if($top, false, $r-top),
        $b: if($bottom, false, $r-bottom)
      );
    }
  }
}

//-----------------------------------------------
// Corner Props
// creates the porperties of corner or side
// @param image $image (optional)
// @param list $w (optional) [value] [auto] [default] element width.
// @param list $h (optional) [value] [auto] [default] element height.
// @param list $x (optional) [value] [auto] [default] background position x.
// @param list $y (optional) [value] [auto] [default] background position y.
// @param list $l (optional) [value] [auto] [default] position left.
// @param list $r (optional) [value] [auto] [default] position right.
// @param list $t (optional) [value] [auto] [default] position top.
// @param list $b (optional) [value] [auto] [default] position bottom.
//-----------------------------------------------
@mixin corner-props ($image: none, $w: false, $h: false, $x: false, $y: false, $l: false, $r: false, $t: false, $b: false) {
  // each variable takes 3 values: passed auto default
  $left: corner-var($l);
  $right: corner-var($r);
  $top: corner-var($t);
  $bottom: corner-var($b);
  $width: corner-var($w);
  $height: corner-var($h);
  
  @if $image != none { background-image: image-url($image, false, $ui-corners-cache-buster); }
  @if $left != false { left: $left; }
  @if $right != false { right: $right; }
  @if $top != false { top: $top; }
  @if $bottom != false { bottom: $bottom; }
  @if $width != false { width: $width; }
  @if $height != false { height: $height; }
  
  $position-x: corner-var($x);
  $position-y: corner-var($y);
  @if $position-x != false or $position-y != false { background-position: if($position-x != false, $position-x, nth($x, 3)) if($position-y != false, $position-y, nth($x, 3)); }
}

//-----------------------------------------------
// Corner Nth
// returns the value of a list at an index or default value if the index is missing
// @param list $list value list
// @param int $n index within the lsit
// @param mixed $default default value if index does not exist
//-----------------------------------------------
@function corner-nth($list, $n, $default: false) {
  $value: $default;
  @if length($list) > $n - 1 { $value: nth($list, $n) }
  @return $value;
}

//-----------------------------------------------
// Corner Image Width/Height
// returns the width of an image or default
// @param image $image
//-----------------------------------------------
@function corner-image-width($image) {
  @if ($image == none) { @return default; }
  @return image-width($image);
}
@function corner-image-height($image) {
  @if ($image == none) { @return default; }
  @return image-height($image);
}

//-----------------------------------------------
// Corner Vars
// returns the current value unless it is "auto" or "default" then those values are returned
// @param list $list list if values [current value] [value of auto] [value of default]
//-----------------------------------------------
@function corner-var($list) {
  $val: nth($list, 1);
  @if $val == auto { $val: nth($list, 2); }
  @if $val == default { $val: nth($list, 3); }
  @return $val;
}

//-----------------------------------------------
// Basic Styles (required)
//-----------------------------------------------
// corner wrapper
.ui-corners {
    position: relative;
}

// the content of the wrapper
.ui-corners-content {
    position: relative;
    z-index: 1;
}

// all corners and sides
.ui-corners-corner, .ui-corners-side {
    position: absolute;
    z-index: 0;
}


//-----------------------------------------------
// Corners
//-----------------------------------------------
.ui-corners-corner {
    height: $ui-corners-corner-height;
    width: $ui-corners-corner-width;
    background-repeat: no-repeat;
}
.ui-corners-corner-tl {
    top: 0;
    left: 0;
    @if $ui-corners-corner-height != $ui-corners-corner-tl-height { height: $ui-corners-corner-tl-height; }
    @if $ui-corners-corner-width != $ui-corners-corner-tl-width { width: $ui-corners-corner-tl-width; }
    background-position: left top;
}
.ui-corners-corner-tr {
    top: 0;
    right: 0;
    @if $ui-corners-corner-height != $ui-corners-corner-tr-height { height: $ui-corners-corner-tr-height; }
    @if $ui-corners-corner-width != $ui-corners-corner-tr-width { width: $ui-corners-corner-tr-width; }
    background-position: right top;
}
.ui-corners-corner-br {
    bottom: 0;
    right: 0;
    @if $ui-corners-corner-height != $ui-corners-corner-br-height { height: $ui-corners-corner-br-height; }
    @if $ui-corners-corner-width != $ui-corners-corner-br-width { width: $ui-corners-corner-br-width; }
    background-position: right bottom;
}
.ui-corners-corner-bl {
    bottom: 0;
    left: 0;
    @if $ui-corners-corner-height != $ui-corners-corner-bl-height { height: $ui-corners-corner-bl-height; }
    @if $ui-corners-corner-width != $ui-corners-corner-bl-width { width: $ui-corners-corner-bl-width; }
    background-position: left bottom;
}

//-----------------------------------------------
// Sides
//-----------------------------------------------
.ui-corners-side-top, .ui-corners-side-bottom {
    left: $ui-corners-corner-width;
    right: $ui-corners-corner-width;
    height: $ui-corners-side-width;
    background-repeat: repeat-x;
}
.ui-corners-side-left, .ui-corners-side-right {
    top: $ui-corners-corner-height;
    bottom: $ui-corners-corner-height;
    width: $ui-corners-side-width;
    background-repeat: repeat-y;
}
.ui-corners-side-top {
    top: 0;
    @if $ui-corners-side-width != $ui-corners-side-top-width { height: $ui-corners-side-top; }
    background-position: left top;
}
.ui-corners-side-bottom {
    bottom: 0;
    @if $ui-corners-side-width != $ui-corners-side-bottom-width { height: $ui-corners-side-bottom; }
    background-position: left bottom;
}
.ui-corners-side-left {
    left: 0;
    @if $ui-corners-side-width != $ui-corners-side-left-width { width: $ui-corners-side-left; }
    background-position: left top;
}
.ui-corners-side-right {
    right: 0;
    @if $ui-corners-side-width != $ui-corners-side-right-width { width: $ui-corners-side-right; }
    background-position: right top;
}
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