[gnome-todo/gbsneto/recoloring] WIP

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 953631e0827255722a216bd3e7819fdb1f76c4f7
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Oct 12 12:21:47 2021 -0300

    WIP

 src/gui/gtd-omni-area.ui                           |   2 +-
 src/plugins/task-lists-workspace/gtd-sidebar.c     |  15 +++
 .../gtd-task-lists-workspace.c                     | 101 ++++++++++++++++++++-
 .../gtd-task-lists-workspace.ui                    |   3 +
 4 files changed, 118 insertions(+), 3 deletions(-)
---
diff --git a/src/gui/gtd-omni-area.ui b/src/gui/gtd-omni-area.ui
index ea79f1fa..8c4195da 100644
--- a/src/gui/gtd-omni-area.ui
+++ b/src/gui/gtd-omni-area.ui
@@ -26,7 +26,7 @@
             <child>
               <object class="GtkBox">
                 <property name="hexpand">true</property>
-                <property name="css-name">entry</property>
+                <property name="css-name">button</property>
 
                 <child>
                   <object class="GtkStack" id="main_stack">
diff --git a/src/plugins/task-lists-workspace/gtd-sidebar.c b/src/plugins/task-lists-workspace/gtd-sidebar.c
index 732ff169..2fa18bc9 100644
--- a/src/plugins/task-lists-workspace/gtd-sidebar.c
+++ b/src/plugins/task-lists-workspace/gtd-sidebar.c
@@ -447,6 +447,11 @@ on_listbox_row_activated_cb (GtkListBox    *panels_listbox,
                                   "(sv)",
                                   gtd_panel_get_panel_name (panel),
                                   g_variant_new_maybe (G_VARIANT_TYPE_VARIANT, NULL));
+
+      gtk_widget_activate_action (GTK_WIDGET (self),
+                                  "task-lists-workspace.recolor",
+                                  "ms",
+                                  NULL);
     }
   else if (GTD_IS_SIDEBAR_PROVIDER_ROW (row))
     {
@@ -454,6 +459,8 @@ on_listbox_row_activated_cb (GtkListBox    *panels_listbox,
     }
   else if (GTD_IS_SIDEBAR_LIST_ROW (row))
     {
+      g_autofree gchar *color_string = NULL;
+      g_autoptr(GdkRGBA) color = NULL;
       GVariantBuilder builder;
       GtdProvider *provider;
       GtdTaskList *list;
@@ -474,6 +481,14 @@ on_listbox_row_activated_cb (GtkListBox    *panels_listbox,
                                   "(sv)",
                                   "task-list-panel",
                                   g_variant_builder_end (&builder));
+
+      color = gtd_task_list_get_color (list);
+      if (color)
+        color_string = gdk_rgba_to_string (color);
+      gtk_widget_activate_action (GTK_WIDGET (self),
+                                  "task-lists-workspace.recolor",
+                                  "ms",
+                                  color_string);
     }
   else if (row == self->archive_row)
     {
diff --git a/src/plugins/task-lists-workspace/gtd-task-lists-workspace.c 
b/src/plugins/task-lists-workspace/gtd-task-lists-workspace.c
index 24d3c66e..e90024e6 100644
--- a/src/plugins/task-lists-workspace/gtd-task-lists-workspace.c
+++ b/src/plugins/task-lists-workspace/gtd-task-lists-workspace.c
@@ -52,6 +52,8 @@ struct _GtdTaskListsWorkspace
 
   PeasExtensionSet   *panels_set;
   GSimpleActionGroup *action_group;
+
+  GtkCssProvider     *css_provider;
 };
 
 static void          gtd_workspace_iface_init                    (GtdWorkspaceInterface  *iface);
@@ -147,6 +149,76 @@ update_panel_menu (GtdTaskListsWorkspace *self)
     }
 }
 
+#define INTENSITY(c)  ((c.red) * 0.30 + (c.green) * 0.59 + (c.blue) * 0.11)
+
+static void
+set_color (GtdTaskListsWorkspace *self,
+           const gchar           *color)
+{
+  g_autofree gchar *formatted_css = NULL;
+
+  if (color)
+    {
+      GdkRGBA rgba;
+
+      if (gdk_rgba_parse (&rgba, color))
+        {
+          /*
+          const gchar *css =
+            "task-lists-workspace headerbar {"
+            "  color: %1$s;"
+            "  background-color: %2$s;"
+            "}"
+            "task-lists-workspace separator,"
+            "task-lists-workspace tasklistview,"
+            "task-lists-workspace taskrow,"
+            "task-lists-workspace newtaskrow,"
+            "task-lists-workspace sidebar {"
+            "  color: %1$s;"
+            "  background-color: %2$s;"
+            "}";
+           */
+          /*
+          const char *css =
+            "@define-color accent_color %2$s;"
+            "@define-color accent_bg_color %2$s;"
+            "@define-color accent_fg_color %1$s;"
+            "";
+           */
+          //const gchar *css =
+            //"task-lists-workspace headerbar.view-headerbar {"
+            //"  color: %1$s;"
+            //"  background-color: %2$s;"
+            //"}"
+            //"task-lists-workspace tasklistview,"
+            //"task-lists-workspace taskrow,"
+            //"task-lists-workspace newtaskrow * {"
+            //"  color: %1$s;"
+          const gchar *css =
+            "@define-color accent_color %2$s;"
+            "@define-color accent_bg_color %2$s;"
+            "@define-color accent_fg_color %1$s;"
+            "task-lists-workspace headerbar.view-headerbar,"
+            "task-lists-workspace tasklistview {"
+            "  background-color: alpha(%2$s, 0.185);"
+            "}";
+          const gchar *text_color;
+
+          if (INTENSITY (rgba) > 0.5)
+            text_color = "@dark_5";
+          else
+            text_color = "@light_1";
+
+          formatted_css = g_strdup_printf (css, text_color, color);
+        }
+    }
+
+  if (!formatted_css)
+    formatted_css = g_strdup ("");
+
+  gtk_css_provider_load_from_data (self->css_provider, formatted_css, -1);
+}
+
 
 /*
  * Callbacks
@@ -195,6 +267,24 @@ on_action_toggle_archive_activated_cb (GSimpleAction *simple,
   gtd_sidebar_set_archive_visible (self->sidebar, archive_visible);
 }
 
+static void
+on_action_recolot_activated_cb (GSimpleAction *simple,
+                                GVariant      *parameter,
+                                gpointer       user_data)
+{
+  GtdTaskListsWorkspace *self = GTD_TASK_LISTS_WORKSPACE (user_data);
+  g_autofree gchar *color = NULL;
+
+  g_message ("%s", g_variant_print (parameter, TRUE));
+
+  if (parameter)
+    g_variant_get (parameter, "ms", &color);
+
+  g_message ("Color: %s", color);
+
+  set_color (self, color);
+}
+
 static void
 on_back_sidebar_button_clicked_cb (GtkButton             *button,
                                    GtdTaskListsWorkspace *self)
@@ -442,7 +532,7 @@ gtd_task_lists_workspace_class_init (GtdTaskListsWorkspaceClass *klass)
    * @manager: a #GtdManager
    * @panel: a #GtdPanel
    *
-   * The ::panel-added signal is emmited after a #GtdPanel
+   * The ::panel-added signal is emitted after a #GtdPanel
    * is added.
    */
   signals[PANEL_ADDED] = g_signal_new ("panel-added",
@@ -461,7 +551,7 @@ gtd_task_lists_workspace_class_init (GtdTaskListsWorkspaceClass *klass)
    * @manager: a #GtdManager
    * @panel: a #GtdPanel
    *
-   * The ::panel-removed signal is emmited after a #GtdPanel
+   * The ::panel-removed signal is emitted after a #GtdPanel
    * is removed from the list.
    */
   signals[PANEL_REMOVED] = g_signal_new ("panel-removed",
@@ -482,6 +572,7 @@ gtd_task_lists_workspace_class_init (GtdTaskListsWorkspaceClass *klass)
   g_type_ensure (GTD_TYPE_SIDEBAR);
 
   gtk_widget_class_set_template_from_resource (widget_class, 
"/org/gnome/todo/plugins/task-lists-workspace/gtd-task-lists-workspace.ui");
+  gtk_widget_class_set_css_name (widget_class, "task-lists-workspace");
 
   gtk_widget_class_bind_template_child (widget_class, GtdTaskListsWorkspace, back_button);
   gtk_widget_class_bind_template_child (widget_class, GtdTaskListsWorkspace, content_box);
@@ -510,10 +601,16 @@ gtd_task_lists_workspace_init (GtdTaskListsWorkspace *self)
   static const GActionEntry entries[] = {
     { "activate-panel", on_action_activate_panel_activated_cb, "(sv)" },
     { "toggle-archive", on_action_toggle_archive_activated_cb, "b" },
+    { "recolor", on_action_recolot_activated_cb, "ms" },
   };
 
   gtk_widget_init_template (GTK_WIDGET (self));
 
+  self->css_provider = gtk_css_provider_new ();
+  gtk_style_context_add_provider_for_display (gdk_display_get_default (),
+                                              GTK_STYLE_PROVIDER (self->css_provider),
+                                              GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+
   self->action_group = g_simple_action_group_new ();
   g_action_map_add_action_entries (G_ACTION_MAP (self->action_group),
                                    entries,
diff --git a/src/plugins/task-lists-workspace/gtd-task-lists-workspace.ui 
b/src/plugins/task-lists-workspace/gtd-task-lists-workspace.ui
index d87e9a63..c950490f 100644
--- a/src/plugins/task-lists-workspace/gtd-task-lists-workspace.ui
+++ b/src/plugins/task-lists-workspace/gtd-task-lists-workspace.ui
@@ -79,6 +79,9 @@
                 <property name="hexpand">1</property>
                 <property name="show-start-title-buttons" bind-source="leaflet" bind-property="folded" 
bind-flags="sync-create" />
                 <property name="show-end-title-buttons">True</property>
+                <style>
+                  <class name="view-headerbar" />
+                </style>
 
                 <child>
                   <object class="GtkButton" id="back_sidebar_button">