/*****************

* Drawing mixins *

*****************/

// generic drawing of more complex things

@function _widget_edge($c:$borders_edge) {

// outer highlight "used" on most widgets

  @if $c == none { @return none; }

  @else { @return 0 1px $c; }

}

@mixin lines($t, $c:$selected_bg_color) {

    @if $t==up {

      box-shadow: inset 0 -3px 0 0 darken($c,5%);

    }

    @if $t==down {

      box-shadow: inset 0 3px 0 0 darken($c,5%);

    }

    @if $t==both {

      box-shadow: inset 0 -3px 0 0 darken($c,5%),

                  inset 0 3px 0 0 darken($c,5%);

    }

}

@mixin _shadows($shadow1, $shadow2:none, $shadow3:none, $shadow4:none) {

//

// Helper function to stack up to 4 box-shadows;

//

  @if $shadow4!=none { box-shadow: $shadow1, $shadow2, $shadow3, $shadow4; }

  @else if $shadow3!=none { box-shadow: $shadow1, $shadow2, $shadow3; }

  @else if $shadow2!=none { box-shadow: $shadow1, $shadow2; }

  @else { box-shadow: $shadow1; }

}

// entries

@function entry_focus_border($fc:$selected_bg_color) {

  @if $variant == 'light' { @return $fc; }

  @else { @return if($fc==$selected_bg_color, $selected_borders_color, darken($fc, 35%)); }

}

@function entry_gradient($c) {

  @if $variant=='light' { @return linear-gradient(to bottom, mix($borders_color, $c, 45%),

                                                             mix($borders_color, $c, 3%) 2px,

                                                             $c 90%); }

  @else { @return linear-gradient(to bottom, mix($borders_color, $c, 95%),

                                             mix($borders_color, $c, 40%) 3px,

                                             $c 90%); }

}

@mixin entry($t, $fc:$selected_bg_color, $edge: none) {

//

// Entries drawing function

//

// $t: entry type

// $fc: focus color

// $edge: set to none to not draw the bottom edge or specify a color to not

//        use the default one

//

// possible $t values:

// normal, focus, insensitive, backdrop, backdrop-insensitive, osd, osd-focus, osd-backdrop;

//

  $_blank_edge: if($edge == none, none, 0 1px transparentize($edge, 1));

  $_entry_edge: if($edge == none, none, _widget_edge($edge));

  @if $t==normal {

    color: $text_color;

    border-color: $borders_color;

    background-color: $base_color;

    // for the transition to work the number of shadows in different states needs to match, hence the transparent shadow here.

  }

  @if $t==focus {

    border-color: entry_focus_border($fc);

  }

  @if $t==insensitive {

    color: $insensitive_fg_color;

    border-color: $insensitive_borders_color;

    background-color: $insensitive_bg_color;

    box-shadow: $_entry_edge;

  }

  @if $t==backdrop {

    color: $backdrop_text_color;

    border-color: $backdrop_borders_color;

    background-color: $backdrop_base_color;

    box-shadow: $_blank_edge;

  }

  @if $t==backdrop-insensitive {

    color: $backdrop_insensitive_color;

    border-color: $insensitive_borders_color;

    background-color: $insensitive_bg_color;

    box-shadow: $_blank_edge;

  }

  @if $t==osd {

    color: $osd_text_color;

    border-color: $osd_borders_color;

    background-color: transparentize(opacify($osd_borders_color, 1), 0.5);

    box-shadow: none;

    text-shadow: 0 1px black;

    -gtk-icon-shadow: 0 1px black;

  }

  @if $t==osd-focus {

    color: $osd_text_color;

    border-color: $selected_bg_color;

    background-color: transparentize(opacify($osd_borders_color, 1), 0.5);

    background-clip: padding-box;

    text-shadow: 0 1px black;

    -gtk-icon-shadow: 0 1px black;

  }

  @if $t==osd-insensitive {

    color: $osd_insensitive_fg_color;

    border-color: $osd_borders_color;

    background-color: $osd_insensitive_bg_color;

    background-clip: padding-box;

    box-shadow: none;

    text-shadow: none;

    -gtk-icon-shadow: none;

  }

  @if $t==osd-backdrop {

    color: $osd_text_color;

    border-color: $osd_borders_color;

    background-color: transparentize(opacify($osd_borders_color, 1), 0.5);

    background-clip: padding-box;

    box-shadow: none;

    text-shadow: none;

    -gtk-icon-shadow: none;

  }

}

// buttons

@function _border_color ($c) { @return darken($c, 25%); } // colored buttons want

                                                         // the border form the

                                                         // base color

@function _text_shadow_color ($tc: $fg_color, $bg: $bg_color) {

//

// calculate the color of text shadows

//

// $tc is the text color

// $bg is the background color

//

  $_lbg: lightness($bg)/100%;

  @if lightness($tc)<50% { @return transparentize(white, 1-$_lbg/($_lbg*1.3)); }

  @else { @return transparentize(black, $_lbg*0.8); }

}

@function _button_hilight_color($c) {

//

// calculate the right top hilight color for buttons

//

// $c: base color;

//

  @if lightness($c)>95% { @return white; }

  @else if lightness($c)>90% { @return transparentize(white, 0.2); }

  @else if lightness($c)>80% { @return transparentize(white, 0.4); }

  @else if lightness($c)>50% { @return transparentize(white, 0.6); }

  @else if lightness($c)>40% { @return transparentize(white, 0.8); }

  @else { @return transparentize(white, 0.95); }

}

@mixin _button_text_shadow ($tc:$fg_color, $bg:$bg_color) {

//

// helper function for the text emboss effect

//

// $tc is the optional text color, not the shadow color

//

// TODO: this functions needs a way to deal with special cases

//

  $_shadow: _text_shadow_color($tc, $bg);

  @if lightness($tc)<50% {

    text-shadow: 0 1px $_shadow;

    -gtk-icon-shadow: 0 1px $_shadow;

  }

  @else {

    text-shadow: 0 -1px $_shadow;

    -gtk-icon-shadow: 0 -1px $_shadow;

  }

}

@mixin button($t, $c:$base_color, $tc:$text_color, $edge: none) {

//

// Button drawing function

//

// $t:    button type,

// $c:    base button color for colored* types

// $tc:   optional text color for colored* types

// $edge: set to none to not draw the bottom edge or specify a color to not

//        use the default one

//

// possible $t values:

// normal, hover, active, insensitive, insensitive-active,

// backdrop, backdrop-active, backdrop-insensitive, backdrop-insensitive-active,

// osd, osd-hover, osd-active, osd-insensitive, osd-backdrop, undecorated

//

  $_hilight_color: _button_hilight_color($c);

  $_button_edge: if($edge == none, none, _widget_edge($edge));

  $_blank_edge: if($edge == none, none, _widget_edge(transparentize($edge,1)));

  @if $t==rounded {

    box-shadow: none;

  //  border: 1px solid $c;

    color: white;

    border-radius: 4px;

    background: $suggested_bg_color; }

    @if $t==rounded-red {

      box-shadow: none;

    //  border: 1px solid $c;

      color: white;

      border-radius: 4px;

      background: $destructive_bg_color; 

    }

  @if $t==normal {

  //

  // normal button

  //

    font-weight: normal;

    color: $tc;

   // outline-color: transparentize($tc, 0.7);

    background-color: mix($bg_color, $base_color, 15%);

    text-shadow: none;

  }

  @else if $t==hover {

  //

  // hovered button

  //

    color: $tc;

    outline-color: transparentize($tc, 0.7);

    background-color: $c;

    text-shadow: none;

    //@include _shadows(inset 0px 1px 0px 0px $top_highlight,inset 0px -1px 0px 0px $bottom_highlight);

  }

  @if $t==normal-header {

  //

  // normal button headerbar look

  //

  color: if($tc==$text_color, $headerbar_fg_color, $tc);

  border-radius: 4px;

  text-shadow: none;

  box-shadow: none;

  border: 1px solid $borders_color;

  background-color: lighten($headerbar_color, 4%);      

}

  @else if $t==hover-header {

  //

  // hovered button headerbar look

  //

  color: if($tc==$text_color, $selected_bg_color, $tc);

  text-shadow: none;

  background-color: transparentize($c, 0.3);

}

@else if $t==backdrop-header {

//

// backdrop button headerbar look

//

  color: if($tc==$text_color, transparentize($tc, 0.6), $tc);

  background-color: $c;

  text-shadow: none;

  box-shadow: none;

}

  @else if $t==active {

  //

  // pushed button

  //

  color: $tc;

  outline-color: transparentize($tc, 0.7);

  background-color: if($c==$base_color, $selected_bg_color, $c);

  text-shadow: none;

 // @include _shadows(inset 0px 1px 0px 0px $top_highlight,inset 0px -1px 0px 0px $bottom_highlight);

}

  @else if $t==insensitive {

  //

  // insensitive button

  //

  color: if($tc==$text_color, $backdrop_text_color, $tc);

  border-color: $insensitive_borders_color;

  background-color: if($c==$base_color, $insensitive_bg_color, $c);

  text-shadow: none;

}

  @else if $t==insensitive-active {

  //

  // insensitive pushed button

  //

  color: transparentize($selected_fg_color, 0.3);

  outline-color: transparentize($tc, 0.7);

  background-color: if($c==$base_color, $selected_bg_color, $c);

  text-shadow: none;

  label { color: transparentize($selected_fg_color, 0.3); }

}

  @else if $t==backdrop {

  //

  // backdrop button

  //

  color: if($tc==$text_color, $backdrop_text_color, transparentize($tc, 0.6));

  outline-color: transparentize($tc, 0.7);

  background-color: if($c==$base_color, $backdrop_base_color, $c);

  text-shadow: none;

}

  @else if $t==backdrop-active {

  //

  // backdrop pushed button FIXME no colors here!

  //

  color: transparentize($selected_fg_color, 0.3);

  outline-color: transparentize($tc, 0.7);

  background-color: $selected_bg_color;

  text-shadow: none;

  label { color: transparentize($selected_fg_color, 0.3); }

}

  @else if $t==backdrop-insensitive {

  //

  // backdrop insensitive button

  //

  color: if($tc==$text_color, $backdrop_text_color, $tc);

  border-color: $insensitive_borders_color;

  background-color: if($c==$base_color, $insensitive_bg_color, $c);

  text-shadow: none;

}

  @else if $t==backdrop-insensitive-active {

  //

  // backdrop insensitive pushed button

  //

  color: transparentize($selected_fg_color, 0.3);

  outline-color: transparentize($tc, 0.7);

  background-color: $selected_bg_color;

  text-shadow: none;

}

  @else if $t==osd {

  //

  // normal osd button

  //

    $_bg: if($c!=$base_color, transparentize($c, 0.5),

                            $osd_bg_color);

    color: $osd_fg_color;

    border-color: $osd_borders_color;

    background-color: $_bg;

    background-clip: padding-box;

    text-shadow: 0 1px black;

    -gtk-icon-shadow: 0 1px black;

    outline-color: transparentize($osd_fg_color, 0.7);

  }

  @else if $t==osd-hover {

  //

  // active osd button

  //

    $_bg: if($c!=$base_color, transparentize($c, 0.3),

                            lighten($osd_bg_color, 12%));

    color: white;

    border-color: $osd_borders_color;

    background-image: linear-gradient(to bottom, $_bg, $_bg);

    background-clip: padding-box;

    text-shadow: 0 1px black;

    -gtk-icon-shadow: 0 1px black;

    outline-color: transparentize($osd_fg_color, 0.7);

  }

  @else if $t==osd-active {

  //

  // active osd button

  //

    $_bg: if($c!=$base_color, $c, lighten($osd_bg_color, 6%));

    color: white;

    border-color: $osd_borders_color;

    background-image: linear-gradient(to bottom, $_bg, $_bg);

    background-clip: padding-box;

    text-shadow: none;

    -gtk-icon-shadow: none;

    outline-color: transparentize($osd_fg_color, 0.7);

  }

  @else if $t==osd-insensitive {

  //

  // insensitive osd button

  //

    color: $osd_insensitive_fg_color;

    border-color: $osd_borders_color;

    background-image: linear-gradient(to bottom, $osd_insensitive_bg_color, $osd_insensitive_bg_color);

    background-clip: padding-box;

    box-shadow: none;

    text-shadow: none;

    -gtk-icon-shadow: none;

  }

  @else if $t==osd-backdrop {

  //

  // backdrop osd button

  //

    $_bg: if($c!=$base_color, transparentize($c, 0.5),

                            $osd_bg_color);

    color: $osd_fg_color;

    border-color: $osd_borders_color;

    background-image: linear-gradient(to bottom, $_bg, $_bg);

    background-clip: padding-box;

    box-shadow: none;

    text-shadow: none;

    -gtk-icon-shadow: none;

  }

  @else if $t==undecorated {

  //

  // reset

  //

    border-color: transparent;

    background-color: transparent;

    background-image: none;

    @include _shadows(inset 0 1px transparentize(white, 1),

                      $_blank_edge);

    text-shadow: none;

    -gtk-icon-shadow: none;

  }

}

@mixin trough($flat:false, $c:$bg_color, $tc:$fg_color, $noedge:true) {

  color: mix($tc, $bg_color, 80%);

  @if $flat { background-image: linear-gradient(to bottom, $c, $c); }

  @else {

    background-image: linear-gradient(to bottom,

                                      mix(black,$c,15%) 5%,

                                      mix(black,$c,10%) 20%,

                                      mix(black,$c,10%) 90%,

                                      $c);

  }

  border-color: if($c!=$bg_color, _border_color($c), $border_color);

  @if not($noedge) {

    @if lightness($c) > 60% {

      box-shadow: inset 0 -1px $borders_edge,

                  0 1px $borders_edge;

    }

    @else {

      box-shadow: inset 0 -1px transparentize($borders_edge, 0.5),

                  0 1px transparentize($borders_edge, 0.5);

    }

  }

  @else { box-shadow: none; }

}

@mixin headerbar_fill($c:$headerbar_color, $hc:$top_highlight, $ov: none) {

//

// headerbar fill

//

// $c:  base color

// $hc: top highlight color

// $ov: a background layer for background shorthand (hence no commas!)

//

  $gradient: linear-gradient(to top, darken($c, 13%), darken($c, 2%) 2px, $c 3px);

  @if $variant == 'dark' { $gradient: linear-gradient(to top, darken($c, 3%), darken($c, 1%) 2px, $c 3px); }

  @if $ov != none { background: $c $ov, $gradient; }

  @else { background: $c $gradient; }

  box-shadow: inset 0 1px $hc; // top highlight

}

@mixin overshoot($p, $t:normal, $c:$fg_color) {

//

// overshoot

//

// $p: position

// $t: type

// $c: base color

//

// possible $p values:

// top, bottom, right, left

//

// possible $t values:

// normal, backdrop

//

  $_small_gradient_length: 5%;

  $_big_gradient_length: 100%;

  $_position: center top;

  $_small_gradient_size: 100% $_small_gradient_length;

  $_big_gradient_size: 100% $_big_gradient_length;

  @if $p==bottom {

    $_position: center bottom;

    $_linear_gradient_direction: to top;

  }

  @else if $p==right {

    $_position: right center;

    $_small_gradient_size: $_small_gradient_length 100%;

    $_big_gradient_size: $_big_gradient_length 100%;

  }

  @else if $p==left {

    $_position: left center;

    $_small_gradient_size: $_small_gradient_length 100%;

    $_big_gradient_size: $_big_gradient_length 100%;

  }

  $_small_gradient_color: $c;

  $_big_gradient_color: $c;

  @if $c==$fg_color {

    $_small_gradient_color: darken($borders_color, 10%);

    $_big_gradient_color: $fg_color;

    @if $t==backdrop { $_small_gradient_color: $backdrop_borders_color; }

  }

  $_small_gradient: -gtk-gradient(radial,

                                  $_position, 0,

                                  $_position, 0.5,

                                  to($_small_gradient_color),

                                  to(transparentize($_small_gradient_color, 1)));

  $_big_gradient: -gtk-gradient(radial,

                                $_position, 0,

                                $_position, 0.6,

                                from(transparentize($_big_gradient_color, 0.87)),

                                to(transparentize($_big_gradient_color, 1)));

  @if $t==normal {

    background-image: $_small_gradient, $_big_gradient;

    background-size: $_small_gradient_size, $_big_gradient_size;

  }

  @else if $t==backdrop {

    background-image: $_small_gradient;

    background-size: $_small_gradient_size;

  }

  background-repeat: no-repeat;

  background-position: $_position;

  background-color: transparent; // reset some properties to be sure to not inherit them somehow

  border: none;                  //

  box-shadow: none;              //

}

@mixin sidebar_bg ($dir, $c1, $c2) {

  background-image: linear-gradient(to $dir, $c1 40px,

                                    $c2 35px,$c2 36px,

                                    $c2 36px,$c2 99%, 

                                    $c2 100%);

}