[gnome-todo/wip/gbsneto/plugins: 15/18] scheduled-panel: show headers on tasks

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

commit 3c76ee1a281b4098281167c086a80ce4ab75d460
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sun Jan 17 01:31:49 2016 -0200

    scheduled-panel: show headers on tasks
    
    Simply because I fell in love on Todoist's
    organization. Now, I just have to make it in
    the reverse order and it'll be perfect.

 plugins/eds/eds.gresource.xml     |    3 +-
 plugins/eds/gtd-panel-scheduled.c |  139 +++++++++++++++++++++++++++++++++++++
 plugins/eds/gtd-plugin-eds.c      |   27 +++++++
 plugins/eds/theme/Adwaita.css     |   11 +++
 4 files changed, 179 insertions(+), 1 deletions(-)
---
diff --git a/plugins/eds/eds.gresource.xml b/plugins/eds/eds.gresource.xml
index 5cc98dd..763d96e 100644
--- a/plugins/eds/eds.gresource.xml
+++ b/plugins/eds/eds.gresource.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <gresources>
   <gresource prefix="/org/gnome/todo">
-    <file compressed="true"  alias="ui/eds/edit-pane.ui">edit-pane.ui</file>
+    <file compressed="true" alias="ui/eds/edit-pane.ui">edit-pane.ui</file>
+    <file compressed="true" alias="theme/eds/Adwaita.css" >theme/Adwaita.css</file>
   </gresource>
 </gresources>
diff --git a/plugins/eds/gtd-panel-scheduled.c b/plugins/eds/gtd-panel-scheduled.c
index 5965049..76787f8 100644
--- a/plugins/eds/gtd-panel-scheduled.c
+++ b/plugins/eds/gtd-panel-scheduled.c
@@ -51,6 +51,141 @@ enum {
   N_PROPS
 };
 
+static gchar*
+get_string_for_date (GDateTime *dt,
+                     gint      *span)
+{
+  GDateTime *now;
+  gchar *str;
+  gint days_diff;
+
+  /* This case should never happen */
+  if (!dt)
+    return g_strdup (_("No date set"));
+
+  now = g_date_time_new_now_local ();
+  days_diff = g_date_time_difference (dt, now) / G_TIME_SPAN_DAY;
+
+  if (days_diff < -1)
+    {
+      str = g_strdup_printf (_("%d days ago"), -days_diff);
+    }
+  else if (days_diff == -1)
+    {
+      str = g_strdup (_("Yesterday"));
+    }
+  else if (days_diff == 0)
+    {
+      str = g_strdup (_("Today"));
+    }
+  else if (days_diff == 1)
+    {
+      str = g_strdup (_("Tomorrow"));
+    }
+  else if (days_diff > 1 && days_diff < 7)
+    {
+      str = g_date_time_format (dt, "%A"); // Weekday name
+    }
+  else if (days_diff >= 7 && days_diff < (365 + g_date_time_get_year (dt) % 4 == 0))
+    {
+      str = g_date_time_format (dt, "%B"); // Full month name
+    }
+  else
+    {
+      str = g_strdup_printf ("%d", g_date_time_get_year (dt));
+    }
+
+  if (span)
+    *span = days_diff;
+
+  g_clear_pointer (&now, g_date_time_unref);
+
+  return str;
+}
+
+static GtkWidget*
+create_label (const gchar *text,
+              gint         span,
+              gboolean     first_header)
+{
+  GtkStyleContext *context;
+  GtkWidget *label;
+  GtkWidget *box;
+
+  label = g_object_new (GTK_TYPE_LABEL,
+                        "label", text,
+                        "margin-left", 12,
+                        "margin-bottom", 6,
+                        "margin-top", first_header ? 6 : 18,
+                        "xalign", 0,
+                        "hexpand", TRUE,
+                        NULL);
+
+  context = gtk_widget_get_style_context (label);
+  gtk_style_context_add_class (context, span < 0 ? "date-overdue" : "date-scheduled");
+
+  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+
+  gtk_container_add (GTK_CONTAINER (box), label);
+  gtk_container_add (GTK_CONTAINER (box), gtk_separator_new (GTK_ORIENTATION_HORIZONTAL));
+
+  gtk_widget_show_all (box);
+
+  return box;
+}
+
+static void
+gtd_panel_scheduled_header_func (GtkListBoxRow     *row,
+                                 GtdTask           *row_task,
+                                 GtkListBoxRow     *before,
+                                 GtdTask           *before_task,
+                                 GtdPanelScheduled *panel)
+{
+  GDateTime *dt;
+  gchar *text;
+  gint span;
+
+  dt = gtd_task_get_due_date (row_task);
+
+  if (!before)
+    {
+      text = get_string_for_date (dt, &span);
+
+      gtk_list_box_row_set_header (row, create_label (text,
+                                                      span,
+                                                      TRUE));
+
+      g_free (text);
+    }
+  else
+    {
+      GDateTime *before_dt;
+      gint diff;
+
+      before_dt = gtd_task_get_due_date (before_task);
+      diff = g_date_time_difference (dt, before_dt) / G_TIME_SPAN_DAY;
+
+      if (diff != 0)
+        {
+          text = get_string_for_date (dt, &span);
+
+          gtk_list_box_row_set_header (row, create_label (text,
+                                                          span,
+                                                          FALSE));
+
+          g_free (text);
+        }
+      else
+        {
+          gtk_list_box_row_set_header (row, NULL);
+        }
+
+      g_clear_pointer (&before_dt, g_date_time_unref);
+    }
+
+  g_clear_pointer (&dt, g_date_time_unref);
+}
+
 static void
 gtd_panel_scheduled_clear (GtdPanelScheduled *panel)
 {
@@ -280,6 +415,10 @@ gtd_panel_scheduled_init (GtdPanelScheduled *self)
   gtk_widget_set_vexpand (self->view, TRUE);
   gtk_container_add (GTK_CONTAINER (self), self->view);
 
+  gtd_task_list_view_set_header_func (GTD_TASK_LIST_VIEW (self->view),
+                                      (GtdTaskListViewHeaderFunc) gtd_panel_scheduled_header_func,
+                                      self);
+
   gtk_widget_show_all (GTK_WIDGET (self));
 }
 
diff --git a/plugins/eds/gtd-plugin-eds.c b/plugins/eds/gtd-plugin-eds.c
index 6ca83a3..1ab6619 100644
--- a/plugins/eds/gtd-plugin-eds.c
+++ b/plugins/eds/gtd-plugin-eds.c
@@ -43,6 +43,7 @@ struct _GtdPluginEds
 {
   PeasExtensionBaseClass  parent;
 
+  GtkCssProvider         *provider;
   ESourceRegistry        *registry;
 
   /* Panels */
@@ -420,6 +421,9 @@ gtd_plugin_eds_class_init (GtdPluginEdsClass *klass)
 static void
 gtd_plugin_eds_init (GtdPluginEds *self)
 {
+  GError *error = NULL;
+  GFile* css_file;
+
   self->panels = g_list_append (NULL, gtd_panel_today_new ());
   self->panels = g_list_append (self->panels, gtd_panel_scheduled_new ());
 
@@ -427,6 +431,29 @@ gtd_plugin_eds_init (GtdPluginEds *self)
   e_source_registry_new (NULL,
                          (GAsyncReadyCallback) gtd_plugin_eds_source_registry_finish_cb,
                          self);
+
+  /* load CSS */
+  self->provider = gtk_css_provider_new ();
+  gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
+                                             GTK_STYLE_PROVIDER (self->provider),
+                                             GTK_STYLE_PROVIDER_PRIORITY_APPLICATION + 1);
+
+  css_file = g_file_new_for_uri ("resource:///org/gnome/todo/theme/eds/Adwaita.css");
+
+  gtk_css_provider_load_from_file (self->provider,
+                                   css_file,
+                                   &error);
+  if (error != NULL)
+   {
+     g_warning ("%s: %s: %s",
+                G_STRFUNC,
+                _("Error loading CSS from resource"),
+                error->message);
+
+     g_error_free (error);
+   }
+
+  g_object_unref (css_file);
 }
 
 /* Empty class_finalize method */
diff --git a/plugins/eds/theme/Adwaita.css b/plugins/eds/theme/Adwaita.css
new file mode 100644
index 0000000..38f4ce8
--- /dev/null
+++ b/plugins/eds/theme/Adwaita.css
@@ -0,0 +1,11 @@
+label.date-scheduled {
+    color: #4a90d9;
+    font-size: 16px;
+    font-weight: bold;
+}
+
+label.date-overdue {
+    color: #cc0000;
+    font-size: 16px;
+    font-weight: bold;
+}