Implement "text-align"

"text-align" allows setting the alignment of text, with respect to
other lines and allocated space, without requiring a reference to
the ClutterText (which is private for most widgets).
If not specified, all text is left-aligned.

https://bugzilla.gnome.org/show_bug.cgi?id=622447

data/theme/gnome-shell.css

@@ -553,6 +553,7 @@ StTooltip {
     height: 70px;
     font-size: 10px;
     transition-duration: 100;
+    text-align: center;
 }
 
 .app-well-app.running {

js/ui/appDisplay.js

@@ -456,7 +456,6 @@ AppIcon.prototype = {
         box.add(this.icon, { expand: true, x_fill: false, y_fill: false });
 
         this._name = new St.Label({ text: this.app.get_name() });
-        this._name.clutter_text.line_alignment = Pango.Alignment.CENTER;
         box.add_actor(this._name);
     }
 };

src/st/st-private.c

@@ -280,6 +280,7 @@ _st_set_text_from_style (ClutterText *text,
   PangoAttrList *attribs;
   const PangoFontDescription *font;
   gchar *font_string;
+  StTextAlign align;
 
   st_theme_node_get_foreground_color (theme_node, &color);
   clutter_text_set_color (text, &color);
@@ -309,6 +310,15 @@ _st_set_text_from_style (ClutterText *text,
   clutter_text_set_attributes (text, attribs);
 
   pango_attr_list_unref (attribs);
+
+  align = st_theme_node_get_text_align (theme_node);
+  if(align == ST_TEXT_ALIGN_JUSTIFY) {
+    clutter_text_set_justify (text, TRUE);
+    clutter_text_set_line_alignment (text, PANGO_ALIGN_LEFT);
+  } else {
+    clutter_text_set_justify (text, FALSE);
+    clutter_text_set_line_alignment (text, (PangoAlignment) align);
+  }
 }
 
 gboolean

src/st/st-theme-node.c

@@ -1761,6 +1761,53 @@ st_theme_node_get_text_decoration (StThemeNode *node)
   return 0;
 }
 
+StTextAlign
+st_theme_node_get_text_align(StThemeNode *node)
+{
+  int i;
+
+  ensure_properties(node);
+
+  for (i = node->n_properties - 1; i >= 0; i--)
+    {
+      CRDeclaration *decl = node->properties[i];
+
+      if (strcmp(decl->property->stryng->str, "text-align") == 0)
+        {
+          CRTerm *term = decl->value;
+
+          if (term->type != TERM_IDENT || term->next)
+            continue;
+
+          if (strcmp(term->content.str->stryng->str, "inherit") == 0)
+            {
+              if (node->parent_node)
+                return st_theme_node_get_text_align(node->parent_node);
+              return ST_TEXT_ALIGN_LEFT;
+            }
+          else if (strcmp(term->content.str->stryng->str, "left") == 0)
+            {
+              return ST_TEXT_ALIGN_LEFT;
+            }
+          else if (strcmp(term->content.str->stryng->str, "right") == 0)
+            {
+              return ST_TEXT_ALIGN_RIGHT;
+            }
+          else if (strcmp(term->content.str->stryng->str, "center") == 0)
+            {
+              return ST_TEXT_ALIGN_CENTER;
+            }
+          else if (strcmp(term->content.str->stryng->str, "justify") == 0)
+            {
+              return ST_TEXT_ALIGN_JUSTIFY;
+            }
+        }
+    }
+  if(node->parent_node)
+    return st_theme_node_get_text_align(node->parent_node);
+  return ST_TEXT_ALIGN_LEFT;
+}
+
 static gboolean
 font_family_from_terms (CRTerm *term,
                         char  **family)

src/st/st-theme-node.h

@@ -58,6 +58,13 @@ typedef enum {
     ST_TEXT_DECORATION_BLINK        = 1 << 3
 } StTextDecoration;
 
+typedef enum {
+    ST_TEXT_ALIGN_LEFT = PANGO_ALIGN_LEFT,
+    ST_TEXT_ALIGN_CENTER = PANGO_ALIGN_CENTER,
+    ST_TEXT_ALIGN_RIGHT = PANGO_ALIGN_RIGHT,
+    ST_TEXT_ALIGN_JUSTIFY
+} StTextAlign;
+
 typedef enum {
   ST_GRADIENT_NONE,
   ST_GRADIENT_VERTICAL,
@@ -149,6 +156,8 @@ int    st_theme_node_get_transition_duration (StThemeNode *node);
 
 StTextDecoration st_theme_node_get_text_decoration (StThemeNode *node);
 
+StTextAlign st_theme_node_get_text_align (StThemeNode *node);
+
 /* Font rule processing is pretty complicated, so we just hardcode it
  * under the standard font/font-family/font-size/etc names. This means
  * you can't have multiple separate styled fonts for a single item,