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// Drawing mixins

// generic drawing of more complex things

@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

@mixin entry($t) {
//
// Entries drawing function
//
// $t: entry type
//

  @if $t==normal {
  //
  // normal entry
  //
    color: $text_color;
    border-color: $entry_border;
    background-color: $entry_bg;
    background-image: linear-gradient(to bottom, $entry_bg);
  }

  @if $t==focus {
  //
  // focused entry
  //
    color: $text_color;
    border-color: $selected_bg_color;
    background-color: $entry_bg;
    background-image: linear-gradient(to bottom, $entry_bg);
  }

  @if $t==insensitive {
  //
  // insensitive entry
  //
    color: $insensitive_fg_color;
    border-color: transparentize($entry_border, 0.45);
    background-color: transparentize($entry_bg, 0.45);
    background-image: linear-gradient(to bottom, transparentize($entry_bg, 0.45));
  }

  $_header_entry_bg: if($darker == 'true' or $variant == 'dark', transparentize(darken($header_bg, 4%), 0.1), transparentize($base_color, 0.1));
  $_header_entry_border: if($darker == 'true' or $variant == 'dark', darken($header_bg, 10%), transparentize($header_fg, 0.7));

  @if $t==header-normal {
  //
  // normal header-bar entry
  //

    color: $header_fg;
    border-color: $_header_entry_border;
    background-image: linear-gradient(to bottom, $_header_entry_bg);
    background-color: transparent;

    &.image, &.image:hover { color: inherit; }
  }

  @if $t==header-focus {
  //
  // focused header-bar entry
  //
    color: $selected_fg_color;
    border-color: $selected_bg_color;
    background-image: linear-gradient(to bottom, $selected_bg_color);
  }

  @if $t==header-insensitive {
  //
  // insensitive header-bar entry
  //
    color: transparentize($header_fg, 0.45);
    background-image: linear-gradient(to bottom, transparentize($_header_entry_bg, 0.35));
  }

  @else if $t==osd {
  //
  // normal osd button
  //
    color: $osd_fg_color;
    border-color: transparentize($osd_fg_color, 0.7);
    background-color: transparent;
    background-image: linear-gradient(to bottom, darken($osd_bg_color, 5%));
  }

  @else if $t==osd-focus {
  //
  // active osd button
  //
    color: $selected_bg_color;
    border-color: $selected_bg_color;
    background-image: linear-gradient(to bottom, darken($osd_bg_color, 5%));
  }

  @else if $t==osd-insensitive {
  //
  // insensitive osd button
  //
    color: $osd_insensitive_fg_color;
    border-color: transparentize($osd_fg_color, 0.8);
    background-image: linear-gradient(to bottom, $osd_insensitive_bg_color);
  }
}

// Buttons

@mixin button($t, $actionb_color:red) {
//
// Button drawing function
//
// $t:    button type,
// $actionb_color: used for destructive and suggested action buttons

  @if $t==normal {
  //
  // normal button
  //
    color: $fg_color;
    outline-color: transparentize($fg_color, 0.7);
    border-color: $button_border;
    background-color: $button_bg;
  }

  @else if $t==hover {
  //
  // hovered button
  //
    color: $fg_color;
    outline-color: transparentize($fg_color, 0.7);
    border-color: $selected_bg_color;
    background-color: $button_bg;
  }

  @else if $t==active {
  //
  // pushed button
  //
    color: $selected_fg_color;
    outline-color: transparentize($selected_fg_color, 0.7);
    border-color: $selected_bg_color;
    background-color: $selected_bg_color;
  }

  @else if $t==insensitive {
  //
  // insensitive button
  //
    color: $insensitive_fg_color;
    border-color: transparentize($button_border, 0.45);
    background-color: transparentize($button_bg, 0.45);

    > GtkLabel { color: inherit; }
  }

  @else if $t==insensitive-active {
  //
  // insensitive pushed button
  //
    color: transparentize($selected_fg_color, 0.45);
    border-color: transparentize($selected_bg_color, 0.45);
    background-color: transparentize($selected_bg_color, 0.45);

    opacity: 0.6;

    > GtkLabel { color: inherit; }
  }

  $_header_button_bg: if($darker == 'true' or $variant == 'dark', transparentize(darken($header_bg, 3%), 0.1), transparentize($button_bg, 0.1));
  $_header_button_border: if($darker == 'true' or $variant == 'dark', darken($header_bg, 8%), transparentize($header_fg, 0.7));

  @if $t==header-normal {
  //
  // normal header-bar button
  //
    color: $header_fg;
    outline-color: transparentize($header_fg, 0.7);
    outline-offset: -3px;
    background-color: transparentize($header_bg, 1);
    border-color: transparentize($header_bg, 1);
  }

  @else if $t==header-hover {
  //
  // hovered header-bar button
  //
    color: $header_fg;
    outline-color: transparentize($header_fg, 0.7);
    border-color: $_header_button_border;
    background-color: $_header_button_bg;
  }

  @else if $t==header-active {
  //
  // pushed header-bar button
  //
    color: $selected_fg_color;
    outline-color: transparentize($selected_fg_color, 0.7);
    border-color: $selected_bg_color;
    background-color: $selected_bg_color;
  }

  @else if $t==header-insensitive {
  //
  // insensitive header-bar button
  //
    color: transparentize($header_fg, 0.45);
    background-color: transparentize($header_bg, 1);
    border-color: transparentize($header_bg, 1);

    > GtkLabel { color: inherit; }
  }

  @else if $t==header-insensitive-active {
  //
  // header-bar insensitive pushed button
  //
    color: transparentize($selected_fg_color, 0.25);
    border-color: transparentize($selected_bg_color, 0.35);
    background-color: transparentize($selected_bg_color, 0.35);
  }

  @else if $t==osd {
  //
  // normal osd button
  //
    color: $osd_fg_color;
    outline-color: transparentize($osd_fg_color, 0.7);
    border-color: transparentize($osd_fg_color, 0.7);
    background-color: transparent;
    background-image: linear-gradient(to bottom, darken($osd_bg_color, 5%));
  }

  @else if $t==osd-hover {
  //
  // active osd button
  //
    color: $selected_bg_color;
    outline-color: transparentize($osd_fg_color, 0.7);
    border-color: $selected_bg_color;
    background-image: linear-gradient(to bottom, darken($osd_bg_color, 5%));
  }

  @else if $t==osd-active {
  //
  // active osd button
  //
    color: $selected_fg_color;
    outline-color: transparentize($selected_fg_color, 0.7);
    border-color: $selected_bg_color;
    background-image: linear-gradient(to bottom, $selected_bg_color);
  }

  @else if $t==osd-insensitive {
  //
  // insensitive osd button
  //
    color: $osd_insensitive_fg_color;
    border-color: transparentize($osd_fg_color, 0.8);
    background-image: linear-gradient(to bottom, $osd_insensitive_bg_color);
  }

  @else if $t==suggested_destructive {
  //
  // suggested or destructive action buttons
  //
    background-clip: border-box;

    color: $selected_fg_color;
    outline-color: transparentize($selected_fg_color, 0.7);
    background-color: $actionb_color;
    border-color: $actionb_color;
  }

  @else if $t==undecorated {
  //
  // reset
  //
    border-color: transparent;
    background-color: transparent;
    background-image: none;
  }
}

//
// Overshoot
//
@mixin overshoot($p, $c:$selected_bg_color) {
// $p: position
// $c: base color
//
// possible $p values:
// top, bottom, right, left
//

  $_big_gradient_length: 60%;

  $_position: center top;
  $_big_gradient_size: 100% $_big_gradient_length;

  @if $p==bottom {
    $_position: center bottom;
  }

  @else if $p==right {
    $_position: right center;
    $_big_gradient_size: $_big_gradient_length 100%;
  }

  @else if $p==left {
    $_position: left center;
    $_big_gradient_size: $_big_gradient_length 100%;
  }

  background-image: -gtk-gradient(radial,
                                $_position, 0,
                                $_position, 0.6,
                                from(transparentize($c, 0.8)),
                                to(transparentize($c, 1)));

  background-size: $_big_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;              //
}

//
// Undershoot
//
@mixin undershoot($p) {
// $p: position
//
// possible $p values:
// top, bottom, right, left
//

  $_undershoot_color_dark: transparentize(black, 0.8);
  $_undershoot_color_light: transparentize(white, 0.8);

  $_gradient_dir: left;
  $_dash_bg_size: 10px 1px;
  $_gradient_repeat: repeat-x;
  $_bg_pos: center $p;

  background-color: transparent; // shouldn't be needed, but better to be sure;

  @if ($p == left) or ($p == right) {
    $_gradient_dir: top;
    $_dash_bg_size: 1px 10px;
    $_gradient_repeat: repeat-y;
    $_bg_pos: $p center;
  }

  background-image: linear-gradient(to $_gradient_dir, // this is the dashed line
                                    $_undershoot_color_light 50%,
                                    $_undershoot_color_dark 50%);

  padding-#{$p}: 1px;
  background-size: $_dash_bg_size;
  background-repeat: $_gradient_repeat;
  background-origin: content-box;
  background-position: $_bg_pos;
}