[gnome-flashback] desktop: add size-changed signal to GfDummyIcon

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 705c8843486e6c622b39c2a3a7c6792e36a7528b
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Nov 13 17:35:40 2019 +0200

    desktop: add size-changed signal to GfDummyIcon

 gnome-flashback/libdesktop/gf-dummy-icon.c | 126 +++++++++++++++++++++++++++++
 gnome-flashback/libdesktop/gf-dummy-icon.h |   6 +-
 gnome-flashback/libdesktop/gf-icon.c       |  34 +++++++-
 3 files changed, 163 insertions(+), 3 deletions(-)
---
diff --git a/gnome-flashback/libdesktop/gf-dummy-icon.c b/gnome-flashback/libdesktop/gf-dummy-icon.c
index 2a69d4c..8f6f6a7 100644
--- a/gnome-flashback/libdesktop/gf-dummy-icon.c
+++ b/gnome-flashback/libdesktop/gf-dummy-icon.c
@@ -21,18 +21,132 @@
 struct _GfDummyIcon
 {
   GfIcon parent;
+
+  guint  size_id;
+
+  int    width;
+  int    height;
 };
 
+enum
+{
+  SIZE_CHANGED,
+
+  LAST_SIGNAL
+};
+
+static guint icon_signals[LAST_SIGNAL] = { 0 };
+
 G_DEFINE_TYPE (GfDummyIcon, gf_dummy_icon, GF_TYPE_ICON)
 
+static gboolean
+size_cb (gpointer user_data)
+{
+  GfDummyIcon *self;
+  GtkRequisition icon_size;
+
+  self = GF_DUMMY_ICON (user_data);
+
+  gtk_widget_get_preferred_size (GTK_WIDGET (self), &icon_size, NULL);
+
+  if (self->width != icon_size.width ||
+      self->height != icon_size.height)
+    {
+      self->width = icon_size.width;
+      self->height = icon_size.height;
+
+      g_signal_emit (self, icon_signals[SIZE_CHANGED], 0);
+    }
+
+  self->size_id = 0;
+
+  return G_SOURCE_REMOVE;
+}
+
+static void
+recalculate_size (GfDummyIcon *self)
+{
+  if (self->size_id != 0)
+    return;
+
+  self->size_id = g_idle_add (size_cb, self);
+  g_source_set_name_by_id (self->size_id, "[gnome-flashback] size_cb");
+}
+
+static void
+icon_size_cb (GdkMonitor  *monitor,
+              GParamSpec  *pspec,
+              GfDummyIcon *self)
+{
+  recalculate_size (self);
+}
+
+static void
+extra_text_width_cb (GdkMonitor  *monitor,
+                     GParamSpec  *pspec,
+                     GfDummyIcon *self)
+{
+  recalculate_size (self);
+}
+
+static void
+gf_dummy_icon_dispose (GObject *object)
+{
+  GfDummyIcon *self;
+
+  self = GF_DUMMY_ICON (object);
+
+  if (self->size_id != 0)
+    {
+      g_source_remove (self->size_id);
+      self->size_id = 0;
+    }
+
+  G_OBJECT_CLASS (gf_dummy_icon_parent_class)->dispose (object);
+}
+
+static void
+gf_dummy_icon_style_updated (GtkWidget *widget)
+{
+  GTK_WIDGET_CLASS (gf_dummy_icon_parent_class)->style_updated (widget);
+  recalculate_size (GF_DUMMY_ICON (widget));
+}
+
+static void
+install_signals (void)
+{
+  icon_signals[SIZE_CHANGED] =
+    g_signal_new ("size-changed", GF_TYPE_DUMMY_ICON,
+                  G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL,
+                  G_TYPE_NONE, 0);
+}
+
 static void
 gf_dummy_icon_class_init (GfDummyIconClass *self_class)
 {
+  GObjectClass *object_class;
+  GtkWidgetClass *widget_class;
+
+  object_class = G_OBJECT_CLASS (self_class);
+  widget_class = GTK_WIDGET_CLASS (self_class);
+
+  object_class->dispose = gf_dummy_icon_dispose;
+
+  widget_class->style_updated = gf_dummy_icon_style_updated;
+
+  install_signals ();
 }
 
 static void
 gf_dummy_icon_init (GfDummyIcon *self)
 {
+  g_signal_connect (self, "notify::icon-size",
+                    G_CALLBACK (icon_size_cb),
+                    self);
+
+  g_signal_connect (self, "notify::extra-text-width",
+                    G_CALLBACK (extra_text_width_cb),
+                    self);
 }
 
 GtkWidget *
@@ -68,3 +182,15 @@ gf_dummy_icon_new (void)
 
   return widget;
 }
+
+int
+gf_dummy_icon_get_width (GfDummyIcon *self)
+{
+  return self->width;
+}
+
+int
+gf_dummy_icon_get_height (GfDummyIcon *self)
+{
+  return self->height;
+}
diff --git a/gnome-flashback/libdesktop/gf-dummy-icon.h b/gnome-flashback/libdesktop/gf-dummy-icon.h
index e774410..95fa3ab 100644
--- a/gnome-flashback/libdesktop/gf-dummy-icon.h
+++ b/gnome-flashback/libdesktop/gf-dummy-icon.h
@@ -25,7 +25,11 @@ G_BEGIN_DECLS
 #define GF_TYPE_DUMMY_ICON (gf_dummy_icon_get_type ())
 G_DECLARE_FINAL_TYPE (GfDummyIcon, gf_dummy_icon, GF, DUMMY_ICON, GfIcon)
 
-GtkWidget *gf_dummy_icon_new (void);
+GtkWidget *gf_dummy_icon_new        (void);
+
+int        gf_dummy_icon_get_width  (GfDummyIcon *self);
+
+int        gf_dummy_icon_get_height (GfDummyIcon *self);
 
 G_END_DECLS
 
diff --git a/gnome-flashback/libdesktop/gf-icon.c b/gnome-flashback/libdesktop/gf-icon.c
index bccad7e..37899ca 100644
--- a/gnome-flashback/libdesktop/gf-icon.c
+++ b/gnome-flashback/libdesktop/gf-icon.c
@@ -313,6 +313,35 @@ gf_icon_finalize (GObject *object)
   G_OBJECT_CLASS (gf_icon_parent_class)->finalize (object);
 }
 
+static void
+gf_icon_get_property (GObject    *object,
+                      guint       property_id,
+                      GValue     *value,
+                      GParamSpec *pspec)
+{
+
+  GfIcon *self;
+  GfIconPrivate *priv;
+
+  self = GF_ICON (object);
+  priv = gf_icon_get_instance_private (self);
+
+  switch (property_id)
+    {
+      case PROP_ICON_SIZE:
+        g_value_set_enum (value, priv->icon_size);
+        break;
+
+      case PROP_EXTRA_TEXT_WIDTH:
+        g_value_set_uint (value, priv->extra_text_width);
+        break;
+
+      default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+        break;
+    }
+}
+
 static void
 gf_icon_set_property (GObject      *object,
                       guint         property_id,
@@ -401,7 +430,7 @@ install_properties (GObjectClass *object_class)
                        GF_TYPE_ICON_SIZE,
                        GF_ICON_SIZE_48PX,
                        G_PARAM_CONSTRUCT |
-                       G_PARAM_WRITABLE |
+                       G_PARAM_READWRITE |
                        G_PARAM_STATIC_STRINGS);
 
   icon_properties[PROP_EXTRA_TEXT_WIDTH] =
@@ -410,7 +439,7 @@ install_properties (GObjectClass *object_class)
                        "extra-text-width",
                        0, 100, 48,
                        G_PARAM_CONSTRUCT |
-                       G_PARAM_WRITABLE |
+                       G_PARAM_READWRITE |
                        G_PARAM_STATIC_STRINGS);
 
   g_object_class_install_properties (object_class, LAST_PROP, icon_properties);
@@ -441,6 +470,7 @@ gf_icon_class_init (GfIconClass *self_class)
   object_class->constructed = gf_icon_constructed;
   object_class->dispose = gf_icon_dispose;
   object_class->finalize = gf_icon_finalize;
+  object_class->get_property = gf_icon_get_property;
   object_class->set_property = gf_icon_set_property;
 
   widget_class->get_preferred_width = gf_icon_get_preferred_width;