[gnome-calendar/wip/pandusonu/week-view: 2/21] week-grid, week-header: special-case today when drawing

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

commit e5407d8c72c5cb4d4f631b407c48d11ccb0806c0
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Dec 7 23:58:33 2016 -0200

    week-grid, week-header: special-case today when drawing
    
    The week grid should display a horizontal strip on the today
    column, and the week header should draw the week day labels
    with a custom color.

 data/theme/gtk-styles.css    |   13 ++++++++-
 src/views/gcal-week-grid.c   |   49 +++++++++++++++++++++++++++++++++-
 src/views/gcal-week-header.c |   60 +++++++++++++++++++++++++++++++++--------
 3 files changed, 108 insertions(+), 14 deletions(-)
---
diff --git a/data/theme/gtk-styles.css b/data/theme/gtk-styles.css
index 709d2a0..3a75f57 100644
--- a/data/theme/gtk-styles.css
+++ b/data/theme/gtk-styles.css
@@ -28,7 +28,8 @@ calendar-view.header {
     font-weight: bold;
 }
 
-calendar-view.current {
+calendar-view.current,
+weekgrid.current {
     background-color: alpha(@theme_selected_bg_color, 0.3);
 }
 
@@ -400,6 +401,10 @@ datechooser day:selected:hover {
     color: alpha(@theme_fg_color, 0.6);
 }
 
+.week-header .today {
+    color: @theme_selected_bg_color;
+}
+
 .week-view {
     padding: 0px;
 }
@@ -410,3 +415,9 @@ datechooser day:selected:hover {
     color: alpha(@theme_fg_color, 0.25);
     padding: 18px 12px;
 }
+
+weekgrid.now-strip {
+    background-color: alpha(@theme_selected_bg_color, 0.8);
+    margin: 0 0 0 1px;
+    min-height: 2px;
+}
diff --git a/src/views/gcal-week-grid.c b/src/views/gcal-week-grid.c
index 0b1dc03..0c39ea4 100644
--- a/src/views/gcal-week-grid.c
+++ b/src/views/gcal-week-grid.c
@@ -245,6 +245,7 @@ gcal_week_grid_set_property (GObject      *object,
       self->active_date = g_value_dup_boxed (value);
 
       gtk_widget_queue_resize (GTK_WIDGET (self));
+      gtk_widget_queue_draw (GTK_WIDGET (self));
       return;
 
     default:
@@ -337,6 +338,23 @@ gcal_week_grid_unmap (GtkWidget *widget)
   GTK_WIDGET_CLASS (gcal_week_grid_parent_class)->unmap (widget);
 }
 
+static inline gint
+get_today_column (GcalWeekGrid *self)
+{
+  g_autoptr(GDateTime) today, week_start;
+  gint days_diff;
+
+  today = g_date_time_new_now_local ();
+  week_start = get_start_of_week (self->active_date);
+  days_diff = g_date_time_difference (today, week_start) / G_TIME_SPAN_DAY;
+
+  /* Today is out of range */
+  if (g_date_time_compare (today, week_start) < 0 || days_diff > 7)
+    return -1;
+
+  return days_diff;
+}
+
 static gboolean
 gcal_week_grid_draw (GtkWidget *widget,
                      cairo_t   *cr)
@@ -346,7 +364,7 @@ gcal_week_grid_draw (GtkWidget *widget,
   GtkBorder padding;
   GdkRGBA color;
 
-  gint i, width, height;
+  gint i, width, height, today_column;
 
   PangoLayout *layout;
   PangoFontDescription *font_desc;
@@ -368,6 +386,35 @@ gcal_week_grid_draw (GtkWidget *widget,
 
   cairo_set_line_width (cr, 0.65);
 
+  /* Today column */
+  today_column = get_today_column (GCAL_WEEK_GRID (widget));
+
+  if (today_column != -1)
+    {
+      g_autoptr (GDateTime) now;
+      GtkBorder margin;
+      guint minutes_from_midnight;
+      gint min_stip_height;
+
+      now = g_date_time_new_now_local ();
+      minutes_from_midnight = g_date_time_get_hour (now) * 60 + g_date_time_get_minute (now);
+
+      gtk_style_context_save (context);
+      gtk_style_context_add_class (context, "now-strip");
+
+      gtk_style_context_get (context, state, "min-height", &min_stip_height, NULL);
+      gtk_style_context_get_margin (context, state, &margin);
+
+      gtk_render_background (context,
+                             cr,
+                             today_column * width / 7.0 + margin.left,
+                             round (minutes_from_midnight * ((gdouble) height / MINUTES_PER_DAY) + 
margin.top),
+                             width / 7.0 - margin.left - margin.right,
+                             MAX (1, min_stip_height - margin.top - margin.bottom));
+
+      gtk_style_context_restore (context);
+    }
+
   /* Vertical lines */
   for (i = 0; i < 7; i++)
     {
diff --git a/src/views/gcal-week-header.c b/src/views/gcal-week-header.c
index aa53684..093afa1 100644
--- a/src/views/gcal-week-header.c
+++ b/src/views/gcal-week-header.c
@@ -163,6 +163,23 @@ get_end_of_week (icaltimetype *date)
   return week_end;
 }
 
+static inline gint
+get_today_column (GcalWeekHeader *self)
+{
+  g_autoptr(GDateTime) today, week_start;
+  gint days_diff;
+
+  today = g_date_time_new_now_local ();
+  week_start = get_start_of_week (self->active_date);
+  days_diff = g_date_time_difference (today, week_start) / G_TIME_SPAN_DAY;
+
+  /* Today is out of range */
+  if (g_date_time_compare (today, week_start) < 0 || days_diff > 7)
+    return -1;
+
+  return days_diff;
+}
+
 static gint
 get_event_start_weekday (GcalWeekHeader *self,
                          GcalEvent      *event)
@@ -910,7 +927,7 @@ gcal_week_header_draw (GcalWeekHeader *self,
   PangoLayout *layout;
   PangoFontDescription *bold_font;
 
-  gint i, font_height, current_cell;
+  gint i, font_height, current_cell, today_column;
   gdouble cell_width;
 
   cairo_save(cr);
@@ -934,8 +951,10 @@ gcal_week_header_draw (GcalWeekHeader *self,
   week_end = g_date_time_add_days (week_start, 6);
   current_cell = icaltime_day_of_week (*(self->active_date)) - 1;
   current_cell = (7 + current_cell - self->first_weekday) % 7;
+  today_column = get_today_column (self);
 
   cell_width = alloc.width / 7.0;
+
   pango_layout_get_pixel_size (layout, NULL, &font_height);
 
   for (i = 0; i < 7; i++)
@@ -954,15 +973,18 @@ gcal_week_header_draw (GcalWeekHeader *self,
       gtk_style_context_save (context);
       gtk_style_context_add_class (context, "week-dates");
       gtk_style_context_get (context, state, "font", &bold_font, NULL);
-      gtk_style_context_get_color (context, state, &color);
-      gdk_cairo_set_source_rgba (cr, &color);
+
+      if (i == today_column)
+        gtk_style_context_add_class (context, "today");
 
       pango_layout_set_font_description (layout, bold_font);
       pango_layout_set_text (layout, weekday_date, -1);
-      cairo_move_to (cr,
-                     padding.left + cell_width * i + COLUMN_PADDING,
-                     font_height + padding.bottom);
-      pango_cairo_show_layout (cr,layout);
+
+      gtk_render_layout (context,
+                         cr,
+                         padding.left + cell_width * i + COLUMN_PADDING,
+                         font_height + padding.bottom,
+                         layout);
 
       gtk_style_context_restore (context);
 
@@ -973,24 +995,38 @@ gcal_week_header_draw (GcalWeekHeader *self,
       gtk_style_context_add_class (context, "week-names");
       gtk_style_context_get (context, state, "font", &bold_font, NULL);
 
+      if (i == today_column)
+        gtk_style_context_add_class (context, "today");
+
       pango_layout_set_font_description (layout, bold_font);
       pango_layout_set_text (layout, weekday_abv, -1);
-      cairo_move_to (cr,
-                     padding.left + cell_width * i + COLUMN_PADDING,
-                     0);
-      pango_cairo_show_layout (cr, layout);
+
+      gtk_render_layout (context,
+                         cr,
+                         padding.left + cell_width * i + COLUMN_PADDING,
+                         0.0,
+                         layout);
 
       gtk_style_context_restore (context);
 
       /* Draws the lines after each day of the week */
+      gtk_style_context_save (context);
+      gtk_style_context_add_class (context, "lines");
+
+      gtk_style_context_get_color (context, state, &color);
+      gdk_cairo_set_source_rgba (cr, &color);
+
+      cairo_set_line_width (cr, 0.25);
+
       cairo_move_to (cr,
                      ALIGNED (cell_width * i),
                      font_height + padding.bottom);
 
-      cairo_set_line_width (cr, 0.25);
       cairo_rel_line_to (cr, 0.0, gtk_widget_get_allocated_height (self->draw_area) - font_height + 
padding.bottom);
       cairo_stroke (cr);
 
+      gtk_style_context_restore (context);
+
       g_free (weekday_date);
       g_free (weekday_abv);
     }