[gnome-calendar/wip/pandusonu/week-view] week-view: adapt view and widgets to handle RTL

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

commit bcfe13bcbc4e477a6f4870b679db8826dc951259
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Thu Dec 8 20:33:34 2016 -0200

    week-view: adapt view and widgets to handle RTL

 src/views/gcal-week-grid.c   |   34 ++++++++++++++++++++++++++++++----
 src/views/gcal-week-header.c |   30 ++++++++++++++++++++++++++----
 src/views/gcal-week-view.c   |   20 ++++++++++++++++----
 3 files changed, 72 insertions(+), 12 deletions(-)
---
diff --git a/src/views/gcal-week-grid.c b/src/views/gcal-week-grid.c
index 2aca228..55bdbd3 100644
--- a/src/views/gcal-week-grid.c
+++ b/src/views/gcal-week-grid.c
@@ -375,6 +375,8 @@ gcal_week_grid_draw (GtkWidget *widget,
   GtkBorder padding;
   GdkRGBA color;
 
+  gboolean ltr;
+  gdouble x, column_width;
   gint i, width, height, today_column;
 
   PangoLayout *layout;
@@ -383,6 +385,7 @@ gcal_week_grid_draw (GtkWidget *widget,
   self = GCAL_WEEK_GRID (widget);
   context = gtk_widget_get_style_context (widget);
   state = gtk_widget_get_state_flags (widget);
+  ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 
   gtk_style_context_add_class (context, "hours");
   gtk_style_context_get_color (context, state, &color);
@@ -395,6 +398,7 @@ gcal_week_grid_draw (GtkWidget *widget,
 
   width = gtk_widget_get_allocated_width (widget);
   height = gtk_widget_get_allocated_height (widget);
+  column_width = width / 7.0;
 
   cairo_set_line_width (cr, 0.65);
 
@@ -405,6 +409,7 @@ gcal_week_grid_draw (GtkWidget *widget,
     {
       g_autoptr (GDateTime) now;
       GtkBorder margin;
+      gdouble strip_width;
       guint minutes_from_midnight;
       gint min_stip_height;
 
@@ -417,11 +422,18 @@ gcal_week_grid_draw (GtkWidget *widget,
       gtk_style_context_get (context, state, "min-height", &min_stip_height, NULL);
       gtk_style_context_get_margin (context, state, &margin);
 
+      strip_width = column_width - margin.left - margin.right;
+
+      if (ltr)
+        x = today_column * column_width + margin.left;
+      else
+        x = width - (today_column * column_width + margin.right) - strip_width;
+
       gtk_render_background (context,
                              cr,
-                             today_column * width / 7.0 + margin.left,
+                             x,
                              round (minutes_from_midnight * ((gdouble) height / MINUTES_PER_DAY) + 
margin.top),
-                             width / 7.0 - margin.left - margin.right,
+                             strip_width,
                              MAX (1, min_stip_height - margin.top - margin.bottom));
 
       gtk_style_context_restore (context);
@@ -430,7 +442,12 @@ gcal_week_grid_draw (GtkWidget *widget,
   /* Vertical lines */
   for (i = 0; i < 7; i++)
     {
-      cairo_move_to (cr, ALIGNED (((width) / 7.0) * i), 0);
+      if (ltr)
+        x = column_width * i;
+      else
+        x = width - column_width * i;
+
+      cairo_move_to (cr, ALIGNED (x), 0);
       cairo_rel_line_to (cr, 0, height);
     }
 
@@ -475,9 +492,11 @@ gcal_week_grid_size_allocate (GtkWidget     *widget,
                               GtkAllocation *allocation)
 {
   GcalWeekGrid *self = GCAL_WEEK_GRID (widget);
+  gboolean ltr;
   gdouble minutes_height;
   gdouble column_width;
   guint i;
+  guint x;
 
   /* No need to relayout stuff if nothing changed */
   if (allocation->height == gtk_widget_get_allocated_height (widget) &&
@@ -490,6 +509,8 @@ gcal_week_grid_size_allocate (GtkWidget     *widget,
   /* Allocate the widget */
   gtk_widget_set_allocation (widget, allocation);
 
+  ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
+
   if (gtk_widget_get_realized (widget))
     {
       gdk_window_move_resize (self->event_window,
@@ -550,8 +571,13 @@ gcal_week_grid_size_allocate (GtkWidget     *widget,
           width = column_width / events_at_range - margin.left - margin.right;
           height = MAX ((data->end - data->start) * minutes_height - margin.top - margin.bottom, 
natural_height);
 
+          if (ltr)
+            x = column_width * i + allocation->x + margin.left + 1;
+          else
+            x = allocation->width - width - (column_width * i + allocation->x + margin.left + 1);
+
           /* Setup the child position and size */
-          child_allocation.x = column_width * i + allocation->x + margin.left + 1;
+          child_allocation.x = x;
           child_allocation.y = (data->start % MINUTES_PER_DAY) * minutes_height + margin.top;
           child_allocation.width = width;
           child_allocation.height = height;
diff --git a/src/views/gcal-week-header.c b/src/views/gcal-week-header.c
index 73593b6..22962ba 100644
--- a/src/views/gcal-week-header.c
+++ b/src/views/gcal-week-header.c
@@ -1028,19 +1028,25 @@ gcal_week_header_draw (GtkWidget      *widget,
   gint i, font_height, current_cell, today_column;
   gint start_x, start_y;
 
+  gboolean ltr;
+
   cairo_save (cr);
 
   /* Fonts and colour selection */
   self = GCAL_WEEK_HEADER (widget);
   context = gtk_widget_get_style_context (widget);
   state = gtk_widget_get_state_flags (widget);
+  ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 
-  start_x = gtk_widget_get_allocated_width (self->expand_button_box);
+  start_x = ltr ? gtk_widget_get_allocated_width (self->expand_button_box) : 0;
   start_y = gtk_widget_get_allocated_height (self->header_labels_box);
 
   gtk_style_context_get_padding (context, state, &padding);
   gtk_widget_get_allocation (widget, &alloc);
 
+  if (!ltr)
+    alloc.width -= gtk_widget_get_allocated_width (self->expand_button_box);
+
   gtk_style_context_get_color (context, state, &color);
   gdk_cairo_set_source_rgba (cr, &color);
 
@@ -1070,6 +1076,8 @@ gcal_week_header_draw (GtkWidget      *widget,
   for (i = 0; i < 7; i++)
     {
       gchar *weekday_date, *weekday_abv;
+      gdouble x;
+      gint font_width;
       gint n_day;
 
       n_day = g_date_time_get_day_of_month (week_start) + i;
@@ -1090,9 +1098,16 @@ gcal_week_header_draw (GtkWidget      *widget,
       pango_layout_set_font_description (layout, bold_font);
       pango_layout_set_text (layout, weekday_date, -1);
 
+      pango_layout_get_pixel_size (layout, &font_width, NULL);
+
+      if (ltr)
+        x = padding.left + cell_width * i + COLUMN_PADDING + start_x;
+      else
+        x = alloc.width - (cell_width * i + font_width + COLUMN_PADDING + start_x);
+
       gtk_render_layout (context,
                          cr,
-                         padding.left + cell_width * i + COLUMN_PADDING+ start_x,
+                         x,
                          font_height + padding.bottom + start_y,
                          layout);
 
@@ -1111,9 +1126,16 @@ gcal_week_header_draw (GtkWidget      *widget,
       pango_layout_set_font_description (layout, bold_font);
       pango_layout_set_text (layout, weekday_abv, -1);
 
+      pango_layout_get_pixel_size (layout, &font_width, NULL);
+
+      if (ltr)
+        x = padding.left + cell_width * i + COLUMN_PADDING + start_x;
+      else
+        x = alloc.width - (cell_width * i + font_width + COLUMN_PADDING + start_x);
+
       gtk_render_layout (context,
                          cr,
-                         padding.left + cell_width * i + COLUMN_PADDING + start_x,
+                         x,
                          start_y,
                          layout);
 
@@ -1129,7 +1151,7 @@ gcal_week_header_draw (GtkWidget      *widget,
       cairo_set_line_width (cr, 0.25);
 
       cairo_move_to (cr,
-                     ALIGNED (cell_width * i + start_x),
+                     ALIGNED (ltr ? (cell_width * i + start_x) : (alloc.width - (cell_width * i + start_x))),
                      font_height + padding.bottom + start_y);
 
       cairo_rel_line_to (cr,
diff --git a/src/views/gcal-week-view.c b/src/views/gcal-week-view.c
index 93044dc..85aff04 100644
--- a/src/views/gcal-week-view.c
+++ b/src/views/gcal-week-view.c
@@ -370,13 +370,16 @@ gcal_week_view_draw_hours (GcalWeekView *self,
   GtkBorder padding;
   GdkRGBA color;
 
+  gboolean ltr;
   gint i, width, height;
+  gint font_width;
 
   PangoLayout *layout;
   PangoFontDescription *font_desc;
 
   context = gtk_widget_get_style_context (widget);
   state = gtk_widget_get_state_flags (widget);
+  ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 
   gtk_style_context_add_class (context, "hours");
   gtk_style_context_get_color (context, state, &color);
@@ -399,18 +402,21 @@ gcal_week_view_draw_hours (GcalWeekView *self,
       if (self->use_24h_format)
         {
           hours = g_strdup_printf ("%02d:00", i);
-          pango_layout_set_text (layout, hours, -1);
         }
       else
         {
           hours = g_strdup_printf ("%d %s",
                                    i % 12 == 0 ? 12 : i % 12,
                                    i > 12 ? _("PM") : _("AM"));
-
-          pango_layout_set_text (layout, hours, -1);
         }
 
-      cairo_move_to (cr, padding.left, (height / 24) * i + padding.top);
+      pango_layout_set_text (layout, hours, -1);
+      pango_layout_get_pixel_size (layout, &font_width, NULL);
+
+      cairo_move_to (cr,
+                     ltr ? padding.left : width - font_width - padding.right,
+                     (height / 24) * i + padding.top);
+
       pango_cairo_show_layout (cr, layout);
 
       g_free (hours);
@@ -418,6 +424,12 @@ gcal_week_view_draw_hours (GcalWeekView *self,
 
   cairo_set_line_width (cr, 0.65);
 
+  if (!ltr)
+    {
+      cairo_move_to (cr, 0.5, 0);
+      cairo_rel_line_to (cr, 0, height);
+    }
+
   /* Draws the horizontal complete lines */
   for (i = 1; i < 24; i++)
     {