@function gtkalpha($c, $a) {
  @return unquote('alpha(#{$c},#{$a})');
}

$ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);

* {
  background-clip: padding-box;
  -GtkToolButton-icon-spacing: 4;
  -GtkTextView-error-underline-color: $error_color;

  -GtkScrolledWindow-scrollbar-spacing: 0;

  -GtkToolItemGroup-expander-size: 11;

  -GtkWidget-text-handle-width: 20;
  -GtkWidget-text-handle-height: 20;

  -GtkDialog-button-spacing: 4;
  -GtkDialog-action-area-border: 6;

  // We use the outline properties to signal the focus properties
  outline-color: $focus_color;
  outline-style: dashed;
  outline-offset: -3px;
  outline-width: 1px;
  -gtk-outline-radius: 2px;
}

//
// Base States
//
.background {
  color: $fg_color;
  background-color: $bg_color;
}

*:disabled {
  -gtk-icon-effect: dim;
}

.gtkstyle-fallback {
  background-color: $bg_color;
  color: $fg_color;
  &:hover {
    background-color: lighten($bg_color, 10%);
    color: $fg_color;
  }
  &:active {
    background-color: darken($bg_color, 10%);
    color: $fg_color;
  }
  &:disabled {
    background-color: $insensitive_bg_color;
    color: $insensitive_fg_color;
  }
  &:selected {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }
}

.view,
%view {
  color: $text_color;
  background-color: $bg_color;

  &:selected {
    &,
    &:focus {
      @extend %selected_items;
      border-radius: 2px;
    }
  }
}

.view,
textview {
  text {
    @extend %view;

    selection {
      &:focus,
      & {
        @extend %selected_items;
      }
    }
  }
}

textview border {
  background-color: mix($bg_color, $base_color, 50%);
}

iconview {
  @extend .view;
}

// 鼠标滑动选中的框框样式
rubberband,
.rubberband {
  border: 1px solid $selected_bg_color;
  background-color: transparentize($selected_bg_color, 0.2);
}

flowbox {
  rubberband {
    @extend rubberband;
  }

  flowboxchild {
    padding: 3px;
    border-radius: 2px;

    &:selected {
      @extend %selected_items;

      outline-offset: -2px;
    }
  }
}

label {
  &.separator {
    @extend .dim-label;

    color: $fg_color;
  }

  row:selected &,
  &:selected {
    @extend %nobg_selected_items;
  }

  selection {
    color: $selected_fg_color;
    background-color: $selected_bg_color;
  }

  &:disabled {
    color: $insensitive_fg_color;

    selection {
      @extend %selected_items_disabled;
    }
  }
}

.dim-label {
  color: $dim_label_fg_color;
}

assistant {
  .sidebar {
    background-color: $base_color;
    border-top: 1px solid $borders_color;
    &:dir(ltr) {
      border-right: 1px solid $borders_color;
    }
    &:dir(rtl) {
      border-left: 1px solid $borders_color;
    }
  }

  &.csd .sidebar {
    border-top-style: none;
  }

  .sidebar label {
    padding: 6px 12px;
  }

  .sidebar label.highlight {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }
}

textview {
  // This will get overridden by .view, needed by gedit line numbers and the mintupdate package description
  background-color: $bg_color;
  color: $text_color;
}

%osd,
.osd {
  color: $osd_fg_color;
  border: none;
  background-color: $osd_bg_color;
  background-clip: padding-box;
  box-shadow: none;
}

//
// Spinner Animations
//
@keyframes spin {
  to {
    -gtk-icon-transform: rotate(1turn);
  }
}

spinner {
  background-image: none;
  opacity: 0; // non spinning spinner makes no sense
  -gtk-icon-source: -gtk-icontheme('process-working-symbolic');

  &:checked {
    opacity: 1;
    animation: spin 1s linear infinite;

    &:disabled {
      opacity: 0.5;
    }
  }
}