[gnome-panel/wip/muktupavels/alignment: 5/6] toplevel: add alignment setting

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 7e726900fc32c39f40e58c8f95d6024605a3eba5
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Apr 21 17:15:08 2021 +0300

    toplevel: add alignment setting
    
    This setting will replace existing x, y, x-right, y-bottom,
    x-centered and y-centered settings.
    
    https://gitlab.gnome.org/GNOME/gnome-panel/-/merge_requests/9

 data/org.gnome.gnome-panel.toplevel.gschema.xml |  5 +++
 gnome-panel/panel-enums-gsettings.h             |  6 +++
 gnome-panel/panel-layout.c                      |  1 +
 gnome-panel/panel-schemas.h                     |  1 +
 gnome-panel/panel-toplevel.c                    | 52 +++++++++++++++++++++++++
 5 files changed, 65 insertions(+)
---
diff --git a/data/org.gnome.gnome-panel.toplevel.gschema.xml b/data/org.gnome.gnome-panel.toplevel.gschema.xml
index 873549ad2..0f70e3ccb 100644
--- a/data/org.gnome.gnome-panel.toplevel.gschema.xml
+++ b/data/org.gnome.gnome-panel.toplevel.gschema.xml
@@ -20,6 +20,11 @@
       <summary>Panel orientation</summary>
       <description>The orientation of the panel. Possible values are "top", "bottom", "left", "right". In 
expanded mode the key specifies which screen edge the panel is on. In un-expanded mode the difference between 
"top" and "bottom" is less important - both indicate that this is a horizontal panel - but still give a 
useful hint as to how some panel objects should behave. For example, on a "top" panel a menu button will pop 
up its menu below the panel, whereas on a "bottom" panel the menu will be popped up above the 
panel.</description>
     </key>
+    <key name="alignment" enum="org.gnome.gnome-panel.PanelAlignment">
+      <default>'center'</default>
+      <summary>Panel alignment</summary>
+      <description>The alignment of the panel. Possible values are "start", "center", "end".</description>
+    </key>
     <key name="size" type="i">
       <default>24</default>
       <summary>Panel size</summary>
diff --git a/gnome-panel/panel-enums-gsettings.h b/gnome-panel/panel-enums-gsettings.h
index 93f9fe3a3..40176fb50 100644
--- a/gnome-panel/panel-enums-gsettings.h
+++ b/gnome-panel/panel-enums-gsettings.h
@@ -43,6 +43,12 @@ typedef enum { /*< flags=0 >*/
 #define PANEL_HORIZONTAL_MASK (PANEL_ORIENTATION_TOP | PANEL_ORIENTATION_BOTTOM)
 #define PANEL_VERTICAL_MASK (PANEL_ORIENTATION_LEFT | PANEL_ORIENTATION_RIGHT)
 
+typedef enum {
+       PANEL_ALIGNMENT_START  = 0,
+       PANEL_ALIGNMENT_CENTER = 1,
+       PANEL_ALIGNMENT_END    = 2
+} PanelAlignment;
+
 typedef enum {
        PANEL_ANIMATION_SLOW   = 0,
        PANEL_ANIMATION_MEDIUM = 1,
diff --git a/gnome-panel/panel-layout.c b/gnome-panel/panel-layout.c
index 639c3051e..f7265743b 100644
--- a/gnome-panel/panel-layout.c
+++ b/gnome-panel/panel-layout.c
@@ -90,6 +90,7 @@ static PanelLayoutKeyDefinition panel_layout_toplevel_keys[] = {
         { PANEL_TOPLEVEL_MONITOR_KEY,         G_TYPE_INT      },
         { PANEL_TOPLEVEL_EXPAND_KEY,          G_TYPE_BOOLEAN  },
         { PANEL_TOPLEVEL_ORIENTATION_KEY,     G_TYPE_STRING   },
+        { PANEL_TOPLEVEL_ALIGNMENT_KEY,       G_TYPE_INT      },
         { PANEL_TOPLEVEL_SIZE_KEY,            G_TYPE_INT      },
         { PANEL_TOPLEVEL_X_KEY,               G_TYPE_INT      },
         { PANEL_TOPLEVEL_Y_KEY,               G_TYPE_INT      },
diff --git a/gnome-panel/panel-schemas.h b/gnome-panel/panel-schemas.h
index cbf28b300..d0ee8dcca 100644
--- a/gnome-panel/panel-schemas.h
+++ b/gnome-panel/panel-schemas.h
@@ -38,6 +38,7 @@
 #define PANEL_TOPLEVEL_MONITOR_KEY          "monitor"
 #define PANEL_TOPLEVEL_EXPAND_KEY           "expand"
 #define PANEL_TOPLEVEL_ORIENTATION_KEY      "orientation"
+#define PANEL_TOPLEVEL_ALIGNMENT_KEY        "alignment"
 #define PANEL_TOPLEVEL_SIZE_KEY             "size"
 #define PANEL_TOPLEVEL_X_KEY                "x"
 #define PANEL_TOPLEVEL_Y_KEY                "y"
diff --git a/gnome-panel/panel-toplevel.c b/gnome-panel/panel-toplevel.c
index a5d7077a5..bf4b6fb14 100644
--- a/gnome-panel/panel-toplevel.c
+++ b/gnome-panel/panel-toplevel.c
@@ -89,6 +89,7 @@ struct _PanelToplevelPrivate {
 
        gboolean                expand;
        PanelOrientation        orientation;
+       PanelAlignment          alignment;
        int                     size;
 
        /* relative to the monitor origin */
@@ -141,6 +142,7 @@ struct _PanelToplevelPrivate {
        int                     orig_y_bottom;
        int                     orig_size;
        int                     orig_orientation;
+       PanelAlignment          orig_alignment;
 
        /* relative to the monitor origin */
        int                     animation_end_x;
@@ -204,6 +206,7 @@ enum {
        PROP_NAME,
        PROP_EXPAND,
        PROP_ORIENTATION,
+       PROP_ALIGNMENT,
        PROP_SIZE,
        PROP_X,
        PROP_X_RIGHT,
@@ -243,6 +246,8 @@ static void panel_toplevel_set_monitor_internal (PanelToplevel *toplevel,
                                                 int            monitor,
                                                 gboolean       force_resize);
 
+static void panel_toplevel_apply_delayed_settings_queue (PanelToplevel *toplevel);
+
 static void
 update_style_classes (PanelToplevel *toplevel)
 {
@@ -575,6 +580,7 @@ panel_toplevel_begin_grab_op (PanelToplevel   *toplevel,
        toplevel->priv->orig_y_centered  = toplevel->priv->y_centered;
        toplevel->priv->orig_size        = toplevel->priv->size;
        toplevel->priv->orig_orientation = toplevel->priv->orientation;
+       toplevel->priv->orig_alignment   = toplevel->priv->alignment;
 
        gtk_grab_add (widget);
 
@@ -623,11 +629,33 @@ panel_toplevel_end_grab_op (PanelToplevel *toplevel,
        gdk_seat_ungrab (seat);
 }
 
+static void
+panel_toplevel_set_alignment (PanelToplevel  *toplevel,
+                              PanelAlignment  alignment)
+{
+       g_return_if_fail (PANEL_IS_TOPLEVEL (toplevel));
+
+       if (toplevel->priv->alignment == alignment)
+               return;
+
+       g_object_freeze_notify (G_OBJECT (toplevel));
+
+       toplevel->priv->alignment = alignment;
+
+       gtk_widget_queue_resize (GTK_WIDGET (toplevel));
+
+       panel_toplevel_apply_delayed_settings_queue (toplevel);
+       g_object_notify (G_OBJECT (toplevel), "alignment");
+
+       g_object_thaw_notify (G_OBJECT (toplevel));
+}
+
 static void
 panel_toplevel_cancel_grab_op (PanelToplevel *toplevel,
                               guint32        time_)
 {
        panel_toplevel_set_orientation (toplevel, toplevel->priv->orig_orientation);
+       panel_toplevel_set_alignment (toplevel, toplevel->priv->orig_alignment);
        panel_toplevel_set_monitor (toplevel, toplevel->priv->orig_monitor);
        panel_toplevel_set_size (toplevel, toplevel->priv->orig_size);
        panel_toplevel_set_x (toplevel,
@@ -3250,6 +3278,9 @@ panel_toplevel_set_property (GObject      *object,
        case PROP_ORIENTATION:
                panel_toplevel_set_orientation (toplevel, g_value_get_enum (value));
                break;
+       case PROP_ALIGNMENT:
+               panel_toplevel_set_alignment (toplevel, g_value_get_enum (value));
+               break;
        case PROP_SIZE:
                panel_toplevel_set_size (toplevel, g_value_get_int (value));
                break;
@@ -3347,6 +3378,9 @@ panel_toplevel_get_property (GObject    *object,
        case PROP_ORIENTATION:
                g_value_set_enum (value, toplevel->priv->orientation);
                break;
+       case PROP_ALIGNMENT:
+               g_value_set_enum (value, toplevel->priv->alignment);
+               break;
        case PROP_SIZE:
                g_value_set_int (value, toplevel->priv->size);
                break;
@@ -3541,6 +3575,17 @@ panel_toplevel_class_init (PanelToplevelClass *klass)
                        PANEL_ORIENTATION_TOP,
                        G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 
+       g_object_class_install_property (
+               gobject_class,
+               PROP_ALIGNMENT,
+               g_param_spec_enum (
+                       "alignment",
+                       "Alignment",
+                       "The alignment of the panel",
+                       PANEL_TYPE_ALIGNMENT,
+                       PANEL_ALIGNMENT_CENTER,
+                       G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
+
        g_object_class_install_property (
                gobject_class,
                PROP_SIZE,
@@ -3873,6 +3918,7 @@ panel_toplevel_init (PanelToplevel *toplevel)
 
        toplevel->priv->expand          = TRUE;
        toplevel->priv->orientation     = PANEL_ORIENTATION_BOTTOM;
+       toplevel->priv->alignment       = PANEL_ALIGNMENT_CENTER;
        toplevel->priv->size            = DEFAULT_SIZE;
        toplevel->priv->x               = 0;
        toplevel->priv->y               = 0;
@@ -4040,6 +4086,12 @@ panel_toplevel_bind_gsettings (PanelToplevel *toplevel)
                         "orientation",
                         G_SETTINGS_BIND_DEFAULT|G_SETTINGS_BIND_NO_SENSITIVITY);
 
+       g_settings_bind (toplevel->priv->delayed_settings,
+                        PANEL_TOPLEVEL_ALIGNMENT_KEY,
+                        toplevel,
+                        "alignment",
+                        G_SETTINGS_BIND_DEFAULT|G_SETTINGS_BIND_NO_SENSITIVITY);
+
        g_settings_bind (toplevel->priv->delayed_settings,
                         PANEL_TOPLEVEL_X_KEY,
                         toplevel,