Improvement: GTK4 - initial support for GTK4

gtk-4.0/COPYRIGHT

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+/*
+ *
+ * Copyright 2020 Mislav Komerički <thekomer@gmail.com>
+ * based on work by Eliver Lara.
+ * source: https://github.com/EliverLara/Sweet/tree/nova
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ */

gtk-4.0/_apps.scss

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+/**********************
+ * DE-Specific Styles *
+ **********************/
+
+@import 'apps/budgie';
+@import 'apps/gnome';
+@import 'apps/xfce';
+@import 'apps/pantheon';
+@import 'apps/unity';
+
+/***********************
+ * App-Specific Styles *
+ ***********************/
+
+@import 'apps/geary';
+@import 'apps/lightdm';
+@import 'apps/nemo';
+@import 'apps/mate';

gtk-4.0/_apps.scss~

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+/**********************
+ * DE-Specific Styles *
+ **********************/
+
+@import 'apps/budgie';
+@import 'apps/gnome';
+@import 'apps/xfce';
+@import 'apps/pantheon';
+@import 'apps/unity';
+
+/***********************
+ * App-Specific Styles *
+ ***********************/
+
+@import 'apps/geary';
+@import 'apps/lightdm';
+@import 'apps/nemo';
+@import 'apps/caja';

gtk-4.0/_colors.scss~

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+// When color definition differs for dark and light variant
+// it gets @if ed depending on $variant
+
+// Main definitions
+$base_color: if($variant == 'light', #ebf0f5, lighten(#161925, 1%));
+$text_color: if($variant == 'light', #31363D, #C3C7D1);
+$bg_color: if($variant == 'light', darken( #EEEEEE, 3%), #161925);
+$fg_color: if($variant == 'light', #31363d, #C3C7D1);
+$switch_bg: if($variant == 'light', #ffffff, transparentize(black,1));
+$shadow_color: rgba(162, 162, 165, 0.21);
+$_sidebar_color: if($variant == 'light', #222e39, #161925);
+
+// Primary colors
+$lime: #71f79f;
+$red: #FF0000;
+$orange: #ff6a00;
+$yellow: #FFD400;
+$purple: #c74ded;
+$darkpurple: #7b7bbd;
+$blue: #7cb7ff;
+$cyan: #00c1e4;
+$slider: #7b7bbd;
+$teal: #00e8c6;
+$myorange: #ff6a00;
+$selected_fg_color: #fefefe;
+$selected_bg_color: #ff6a00;
+//$selected_bg_color: #f7005a;
+/*$selected_bg_color: #00e8c6;06d6a0*/
+$selected_borders_color: darken($selected_bg_color, 10%);
+$borders_color: if($variant == 'light', transparentize(black,0.87), transparentize(#0C0E15,0.2));
+$borders_edge: if($variant == 'light', transparentize(white, 0.8), transparentize(white, 0.9));
+
+$theme-gradient-start: $red;
+$theme-gradient-end: $orange;
+
+
+$link_color: $blue;
+$link_visited_color:transparentize($link_color,0.5);
+$top_highlight: if($variant == 'light', transparentize(white, 0.8), transparentize(white, 0.9));
+$bottom_highlight: if($variant == 'light', transparentize(black, 0.8), transparentize(black, 0.9));
+$dark_fill: mix($borders_color, $bg_color, 35%);
+$headerbar_color: mix($base_color, darken($bg_color, 8%), 30%);
+$headerbar_fg_color: $text_color;
+$menu_color: if($variant == 'light', $base_color, mix($bg_color, $base_color, 20%));
+$popover_bg_color: $base_color;
+$popover_hover_color: lighten($bg_color, 5%);
+
+$scrollbar_bg_color: mix($base_color, $bg_color, 50%);
+$scrollbar_slider_color: mix($fg_color, $bg_color, 60%);
+$scrollbar_slider_hover_color: mix($fg_color, $bg_color, 80%);
+$scrollbar_slider_active_color: if($variant=='light', darken($selected_bg_color, 10%), lighten($selected_bg_color, 10%));
+
+$warning_color: if($variant == 'light', $orange, darken($orange,10%));
+$error_color: if($variant == 'light', $red, darken($red,5%));
+$success_color: if($variant == 'light', $cyan, darken($cyan,10%));
+$destructive_color: if($variant == 'light', darken($red,5%), darken($red,10%));
+$suggested_color: if($variant == 'light', $selected_bg_color, darken($selected_bg_color,10%));
+
+$osd_fg_color: #fefefe;
+$osd_text_color: white;
+$osd_bg_color:  transparentize(#14171a, 0.2);
+$osd_insensitive_bg_color: transparentize(mix($osd_fg_color, opacify($osd_bg_color, 1), 10%), 0.5);
+$osd_insensitive_fg_color: mix($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);
+$shadow_color: transparentize(black, 0.9);
+
+$drop_target_color: #a1ce4b;
+
+$text_shadow_color: if($variant == 'dark', $shadow_color, transparentize(white, 0.9));
+$icon_shadow_color: $text_shadow_color;
+
+$drop_target_color: $lime;
+
+// Infobar colors
+$info_color: $lime;
+$question_color: $cyan;
+
+// Panel colors
+$panel_bg_color: transparentize($base_color, 0);
+$panel_fg_color: white;
+$panel_borders_color: transparentize($base_color, 0.8);
+
+// Disabled state colors
+$insensitive_fg_color: mix($fg_color, $bg_color, 50%);
+$insensitive_bg_color: mix($bg_color, $base_color, 60%);
+$insensitive_base_color: darken($base_color, 5%);
+$insensitive_borders_color: $borders_color;
+
+// Backdrop state colors
+$backdrop_base_color: if($variant == 'light', darken($base_color, 1%), lighten($base_color, 1%));
+$backdrop_text_color: mix($text_color, $backdrop_base_color, 80%);
+$backdrop_bg_color: $bg_color;
+$backdrop_headerbar_bg_color: $headerbar_color;
+$backdrop_headerbar_fg_color: if($variant == 'light', transparentize($headerbar_fg_color, 0.5), transparentize($headerbar_fg_color, 0.2));
+$backdrop_fg_color: mix($fg_color, $backdrop_bg_color, 50%);
+$backdrop_insensitive_color: if($variant == 'light', darken($backdrop_bg_color, 15%), lighten($backdrop_bg_color, 15%));
+$backdrop_selected_bg_color:  transparentize($selected_bg_color, 0.4);
+$backdrop_selected_fg_color: if($variant == 'light', $selected_fg_color, transparentize($selected_fg_color, 0.5));
+$backdrop_borders_color: mix($borders_color, $bg_color, 90%);
+$backdrop_dark_fill: mix($backdrop_borders_color, $backdrop_bg_color, 35%);
+$backdrop_sidebar_bg_color: mix($backdrop_bg_color, $backdrop_base_color, 50%);
+
+$backdrop_scrollbar_bg_color: darken($backdrop_bg_color, 3%);
+$backdrop_scrollbar_slider_color: mix($backdrop_fg_color, $backdrop_bg_color, 40%);
+
+$backdrop_menu_color: if($variant == 'light', $backdrop_base_color, mix($backdrop_bg_color, $backdrop_base_color, 20%));
+
+$scale_bg: if($variant == 'light', transparentize(black,0.86) ,transparentize(white,0.86));
+$scale_disabled_bg: if($variant == 'light', transparentize(black, 0.94) ,transparentize(white, 0.94));
+$suggested_bg_color: linear-gradient(to right, #e87e33 0%, #ff6a00 100%);
+$destructive_bg_color: linear-gradient(to right, #FF416C, #FF4B2B);
+$menu_shadow_color: if($variant == 'light', transparentize(rgb(122, 122, 122), 0.6), transparent);

gtk-4.0/_common.scss

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+/*********
+* Common *
+*********/
+
+@function gtkalpha($c,$a) {
+  @return unquote("alpha(#{$c},#{$a})");
+}
+
+$ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
+$asset_suffix: if($variant=='dark', '-dark', '');
+$backdrop_transition: 200ms ease-out;
+$button_transition: all 200ms $ease-out-quad;
+
+* {
+  padding: 0;
+  // We use the outline properties to signal the focus properties
+  // to the adwaita engine: using real CSS properties is faster,
+  // and we don't use any outlines for now.
+
+  outline-color: transparentize($fg_color, 0.7);
+  outline-style: dashed;
+  outline-offset: -3px;
+  outline-width: 0px;
+
+  -gtk-secondary-caret-color: $selected_bg_color;
+}
+
+/* komer: accessibility for keyboard navigation
+ * needs to be enhanced with focus for specific selected widgets
+ */
+
+*:focus {
+  outline: 1px dashed transparentize($theme_color, 0.3);
+  outline-offset: -2px;
+  &:active, &:selected { outline-color: black; }
+}