[gtk/wip/jimmac/dark-prelights] Adwaita,HC: use dark prelights

[Jakub Steiner <jimmac src gnome org>]

commit 0f0c234c4a14b585cfc9eb365f86b91aa556e1d1
Author: Jakub Steiner <jimmac gmail com>
Date:   Thu Nov 19 22:24:41 2020 +0100

    Adwaita,HC: use dark prelights
    
    - increase :hover visibility by going darker rather than lighter
      puppies died.
    
    Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/3380

 gtk/theme/Adwaita/_colors.scss  |  3 +--
 gtk/theme/Adwaita/_common.scss  | 13 ++++---------
 gtk/theme/Adwaita/_drawing.scss | 30 ++++++------------------------
 3 files changed, 11 insertions(+), 35 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_colors.scss b/gtk/theme/Adwaita/_colors.scss
index 3eddb09ad5..6775370741 100644
--- a/gtk/theme/Adwaita/_colors.scss
+++ b/gtk/theme/Adwaita/_colors.scss
@@ -18,7 +18,7 @@ $top_hilight: $borders_edge;
 $dark_fill: mix($borders_color, $bg_color, 50%);
 $headerbar_color: if($variant == 'light', lighten($bg_color, 5%), darken($bg_color, 3%));
 $menu_color: $base_color;
-$menu_selected_color: if($variant == 'light', darken($bg_color, 3%), $bg_color);
+$menu_selected_color: if($variant == 'light', darken($bg_color, 3%), darken($bg_color, 8%));
 
 $scrollbar_bg_color: if($variant == 'light', mix($bg_color, $fg_color, 80%), mix($base_color, $bg_color, 
50%));
 $scrollbar_slider_color: mix($fg_color, $bg_color, 60%);
@@ -38,7 +38,6 @@ $osd_insensitive_fg_color: mix($osd_fg_color, opacify($osd_bg_color, 1), 50%);
 $osd_borders_color: transparentize(black, 0.3);
 
 $sidebar_bg_color: mix($bg_color, $base_color, 50%);
-$base_hover_color: transparentize($fg_color, 0.95);
 
 $tooltip_borders_color: transparentize(white, 0.9);
 $shadow_color: transparentize(black, 0.9);
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 09b43d09df..dfbe1bb02b 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1034,7 +1034,7 @@ spinbutton {
 
       &:hover {
         color: $fg_color;
-        background-color: $base_hover_color;
+        background-color: darken($bg_color,5%);
       }
 
       &:disabled {
@@ -1077,7 +1077,7 @@ spinbutton {
 
         color: $osd_fg_color;
         border-color: transparentize(opacify($osd_borders_color, 1), 0.5);
-        background-color: transparentize($osd_fg_color, 0.9);
+        background-color: darken($osd_bg_color,10%);
         -gtk-icon-shadow: 0 1px black;
         box-shadow: none;
       }
@@ -2370,12 +2370,7 @@ switch {
   > image { color: transparent; } /* only show i / o for the accessible theme */
 
   &:hover > slider {
-    @if $variant == 'light' {
-      @include button(hover-alt, $edge: $shadow_color);
-    }
-    @else {
-      @include button(hover-alt, $c: lighten($bg_color,6%), $edge: $shadow_color);
-    }
+    @include button(hover, $edge: $shadow_color);
   }
 
   &:checked > slider { border: 1px solid $switch_borders_color; }
@@ -2675,7 +2670,7 @@ scale {
     transition: $button_transition;
     transition-property: background, border, box-shadow;
 
-    &:hover { @include button(hover-alt, $edge: $shadow_color); }
+    &:hover { @include button(hover, $edge: $shadow_color); }
 
     &:active { border-color: $selected_borders_color; }
 
diff --git a/gtk/theme/Adwaita/_drawing.scss b/gtk/theme/Adwaita/_drawing.scss
index e252d4d022..78984e4409 100644
--- a/gtk/theme/Adwaita/_drawing.scss
+++ b/gtk/theme/Adwaita/_drawing.scss
@@ -189,12 +189,12 @@
     border-color: if($c != $bg_color, _border_color($c), $borders_color);
     border-bottom-color: if($c != $bg_color, _border_color($c, true), $alt_borders_color);
     @if $variant == 'light' {
-      background-image: linear-gradient(to top, $c, lighten($c, 1%) 1px);
-      @include _shadows(inset 0 1px _button_hilight_color(lighten($c, 6%)), $_button_edge, $_button_shadow);
+      background-image: linear-gradient(to top, darken($c,16%), darken($c,8%) 1px);
+      @include _shadows(inset 0 1px darken($c,1%), $_button_edge, $_button_shadow);
     }
     @else {
-      background-image: linear-gradient(to top, darken($c,1%), lighten($c, 1%) 1px);
-      @include _shadows(inset 0 1px _button_hilight_color(darken($c, 2%)), $_button_edge, $_button_shadow);
+      background-image: linear-gradient(to top, darken($c,4%) 20%, darken($c, 3%) 90%);
+      @include _shadows(inset 0 1px $c, $_button_edge, $_button_shadow);
     }
   }
 
@@ -217,24 +217,6 @@
     }
   }
 
-  @else if $t==hover-alt {
-  //
-  // hovered button alternative look
-  //
-    color: $tc;
-    border-color: if($c != $bg_color, _border_color($c, true), $alt_borders_color);
-    @if $variant == 'light' {
-      background-image: linear-gradient(to bottom, lighten($c, 9%) 10%, lighten($c, 4%) 90%);
-      @include _shadows(inset 0 1px _button_hilight_color(lighten($c, 6%)),
-                        $_button_edge, $_button_shadow);
-    }
-    @else {
-      background-image: linear-gradient(to bottom, $c 20%, darken($c, 4%) 90%);
-      @include _shadows(inset 0 1px $_hilight_color,
-                        $_button_edge, $_button_shadow);
-    }
-  }
-
   @else if $t==active {
   //
   // pushed button
@@ -360,7 +342,7 @@
   //
   // active osd button
   //
-    $_bg: if($c != $bg_color, transparentize($c, 0.3), lighten($osd_bg_color, 12%));
+    $_bg: if($c != $bg_color, transparentize($c, 0.3), darken($osd_bg_color, 10%));
 
     color: white;
     border-color: $osd_borders_color;
@@ -376,7 +358,7 @@
   //
   // active osd button
   //
-    $_bg: if($c != $bg_color, $c, $osd_borders_color);
+    $_bg: if($c != $bg_color, $c, darken($osd_bg_color, 20%));
 
     color: white;
     border-color: $osd_borders_color;