[gtk/prop-list] column view title: Add sort indicators

[Matthias Clasen <matthiasc src gnome org>]

commit 3d0374effcde2ed86fc629b7d2a27250000b39a3
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Dec 3 02:26:33 2019 -0500

    column view title: Add sort indicators
    
    And make the titles clickable to change sort.

 gtk/gtkcolumnviewtitle.c | 102 +++++++++++++++++++++++++++++++++--------------
 1 file changed, 71 insertions(+), 31 deletions(-)
---
diff --git a/gtk/gtkcolumnviewtitle.c b/gtk/gtkcolumnviewtitle.c
index 7170018eb4..92ee78713e 100644
--- a/gtk/gtkcolumnviewtitle.c
+++ b/gtk/gtkcolumnviewtitle.c
@@ -25,6 +25,9 @@
 #include "gtkintl.h"
 #include "gtklabel.h"
 #include "gtkwidgetprivate.h"
+#include "gtkboxlayout.h"
+#include "gtkimage.h"
+#include "gtkgestureclick.h"
 
 struct _GtkColumnViewTitle
 {
@@ -33,6 +36,7 @@ struct _GtkColumnViewTitle
   GtkColumnViewColumn *column;
 
   GtkWidget *title;
+  GtkWidget *sort;
 };
 
 struct _GtkColumnViewTitleClass
@@ -42,39 +46,14 @@ struct _GtkColumnViewTitleClass
 
 G_DEFINE_TYPE (GtkColumnViewTitle, gtk_column_view_title, GTK_TYPE_WIDGET)
 
-static void
-gtk_column_view_title_measure (GtkWidget      *widget,
-                               GtkOrientation  orientation,
-                               int             for_size,
-                               int            *minimum,
-                               int            *natural,
-                               int            *minimum_baseline,
-                               int            *natural_baseline)
-{
-  GtkWidget *child = gtk_widget_get_first_child (widget);
-
-  if (child)
-    gtk_widget_measure (child, orientation, for_size, minimum, natural, minimum_baseline, natural_baseline);
-}
-
-static void
-gtk_column_view_title_size_allocate (GtkWidget *widget,
-                                     int        width,
-                                     int        height,
-                                     int        baseline)
-{
-  GtkWidget *child = gtk_widget_get_first_child (widget);
-
-  if (child)
-    gtk_widget_allocate (child, width, height, baseline, NULL);
-}
-
 static void
 gtk_column_view_title_dispose (GObject *object)
 {
   GtkColumnViewTitle *self = GTK_COLUMN_VIEW_TITLE (object);
 
-  g_clear_pointer(&self->title, gtk_widget_unparent);
+  g_signal_handlers_disconnect_by_func (self->column, gtk_column_view_title_update, self);
+  g_clear_pointer (&self->title, gtk_widget_unparent);
+  g_clear_pointer (&self->sort, gtk_widget_unparent);
 
   g_clear_object (&self->column);
 
@@ -87,11 +66,9 @@ gtk_column_view_title_class_init (GtkColumnViewTitleClass *klass)
   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 
-  widget_class->measure = gtk_column_view_title_measure;
-  widget_class->size_allocate = gtk_column_view_title_size_allocate;
-
   gobject_class->dispose = gtk_column_view_title_dispose;
 
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BOX_LAYOUT);
   gtk_widget_class_set_css_name (widget_class, I_("button"));
 }
 
@@ -104,15 +81,53 @@ gtk_column_view_title_resize_func (GtkWidget *widget)
     gtk_column_view_column_queue_resize (self->column);
 }
 
+static void
+click_pressed_cb (GtkGestureClick *gesture,
+                  guint            n_press,
+                  gdouble          x,
+                  gdouble          y,
+                  GtkWidget       *widget)
+{
+  GtkColumnViewTitle *self = GTK_COLUMN_VIEW_TITLE (widget);
+  GtkSorter *sorter;
+  GtkSorter *active_sorter;
+  
+  sorter = gtk_column_view_column_get_sorter (self->column);
+  active_sorter = gtk_column_view_get_sorter (gtk_column_view_column_get_column_view (self->column));
+
+  if (sorter)
+    {
+      if (sorter == active_sorter)
+        {
+          gtk_sorter_set_sort_direction (sorter, 1 - gtk_sorter_get_sort_direction (sorter));
+        }
+      else
+        {
+          gtk_sorter_set_sort_direction (sorter, GTK_SORT_ASCENDING);
+          gtk_column_view_set_sorter (gtk_column_view_column_get_column_view (self->column), sorter);
+        }
+    }
+
+  gtk_column_view_title_update (self);
+}
+
 static void
 gtk_column_view_title_init (GtkColumnViewTitle *self)
 {
   GtkWidget *widget = GTK_WIDGET (self);
+  GtkGesture *gesture;
 
   widget->priv->resize_func = gtk_column_view_title_resize_func;
 
   self->title = gtk_label_new (NULL);
   gtk_widget_set_parent (self->title, widget);
+
+  self->sort = gtk_image_new ();
+  gtk_widget_set_parent (self->sort, widget);
+
+  gesture = gtk_gesture_click_new ();
+  g_signal_connect (gesture, "pressed", G_CALLBACK (click_pressed_cb), self);
+  gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (gesture));
 }
 
 GtkWidget *
@@ -126,13 +141,38 @@ gtk_column_view_title_new (GtkColumnViewColumn *column)
   title->column = g_object_ref (column);
   gtk_column_view_title_update (title);
 
+  g_signal_connect_swapped (gtk_column_view_column_get_column_view (column), "notify::sorter",
+                            G_CALLBACK (gtk_column_view_title_update), title);
+
   return GTK_WIDGET (title);
 }
 
 void
 gtk_column_view_title_update (GtkColumnViewTitle *self)
 {
+  GtkSorter *sorter;
+  GtkSorter *active_sorter;
+
   gtk_label_set_label (GTK_LABEL (self->title), gtk_column_view_column_get_title (self->column));
+
+  sorter = gtk_column_view_column_get_sorter (self->column);
+  active_sorter = gtk_column_view_get_sorter (gtk_column_view_column_get_column_view (self->column));
+
+  if (sorter)
+    {
+      gtk_widget_show (self->sort);
+      if (sorter == active_sorter)
+        {
+          if (gtk_sorter_get_sort_direction (sorter) == GTK_SORT_ASCENDING)
+            gtk_image_set_from_icon_name (GTK_IMAGE (self->sort), "pan-down-symbolic");
+          else          
+            gtk_image_set_from_icon_name (GTK_IMAGE (self->sort), "pan-up-symbolic");
+        }
+      else
+        gtk_image_clear (GTK_IMAGE (self->sort));
+    }
+  else
+    gtk_widget_hide (self->sort);
 }
 
 GtkColumnViewColumn *