[sound-juicer/gnome-3-18] Fix the width of the EggPlayPreview duration label

[Phillip Wood <pwood src gnome org>]

commit 75647fcc52ff6a2de94797c955c8c27b89c8d02f
Author: Phillip Wood <phillip wood dunelm org uk>
Date:   Mon Feb 8 11:33:09 2016 +0000

    Fix the width of the EggPlayPreview duration label
    
    In order to stop the label moving (and forcing the dialog to resize)
    as the played time changes find the widest time and fix the width to
    that.

 src/egg-play-preview.c |  104 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 103 insertions(+), 1 deletions(-)
---
diff --git a/src/egg-play-preview.c b/src/egg-play-preview.c
index 2639212..264f54c 100644
--- a/src/egg-play-preview.c
+++ b/src/egg-play-preview.c
@@ -107,6 +107,11 @@ static gboolean _change_value_cb             (GtkRange *range,
                                                                                          EggPlayPreview 
*play_preview);
 static void _clicked_cb                      (GtkButton      *button,
                                                                                          EggPlayPreview 
*play_preview);
+static void _duration_notify_cb              (EggPlayPreview *play_preview,
+                                                                                         GParamSpec     
*pspec,
+                                                                                         gpointer        
user_data);
+static void _style_updated_cb                (GtkWidget *widget,
+                                                                                         gpointer   
user_data);
 static void _setup_pipeline                  (EggPlayPreview *play_preview);
 static void _clear_pipeline                  (EggPlayPreview *play_preview);
 static gboolean _process_bus_messages        (GstBus         *bus,
@@ -305,7 +310,10 @@ egg_play_preview_init (EggPlayPreview *play_preview)
        gtk_grid_attach (grid, priv->time_scale, 2, 0, 1, 2);
        priv->time_label = gtk_label_new ("0:00/0:00");
        g_object_set (priv->time_label,
+                                 "halign", GTK_ALIGN_END,
+                                 "justify", GTK_JUSTIFY_RIGHT,
                                  "valign", GTK_ALIGN_CENTER,
+                                 "xalign", 1.0, /* This is needed to right justify the label even though it 
is deprecated */
                                  NULL);
        gtk_grid_attach (grid, priv->time_label, 3, 0, 1, 2);
 
@@ -313,6 +321,10 @@ egg_play_preview_init (EggPlayPreview *play_preview)
                                          G_CALLBACK (_clicked_cb), play_preview);
        g_signal_connect (G_OBJECT (priv->time_scale), "change-value",
                                          G_CALLBACK (_change_value_cb), play_preview);
+       g_signal_connect (play_preview, "notify::duration",
+                                         G_CALLBACK (_duration_notify_cb), NULL);
+       g_signal_connect (priv->time_label, "style-updated",
+                                         G_CALLBACK (_style_updated_cb), play_preview);
 
        gtk_box_pack_start (GTK_BOX (play_preview), GTK_WIDGET (grid), FALSE, FALSE, 0);
 
@@ -435,6 +447,97 @@ egg_play_preview_get_property (GObject     *object,
        }
 }
 
+static void
+calculate_widths (GtkWidget *label, int *widths)
+{
+       int i = 0;
+       for (i = 0; i < 10; i++) {
+               gchar *s;
+               s = g_strdup_printf ("%d", i);
+               gtk_label_set_text (GTK_LABEL (label), s);
+               gtk_widget_get_preferred_width (label, NULL, &widths[i]);
+               g_free (s);
+       }
+}
+
+static int
+get_widest_digit (int *widths, int max)
+{
+       int max_width = 0;
+       int i_max = 0;
+       int i;
+
+       for (i = 0; i <= max; i++) {
+               if (widths[i] > max_width) {
+                       max_width = widths[i];
+                       i_max = i;
+               }
+       }
+
+       return i_max;
+}
+
+static gchar *
+get_widest_time (int *widths, int duration)
+{
+       int minutes;
+       int seconds;
+       int m, s1, s2;
+       const char *format = "%d:%d%d/%d:%02d";
+
+       minutes = duration / 60;
+       seconds = duration % 60;
+
+       s1 = get_widest_digit (widths, 9);
+       if (minutes == 0)
+               s2 = get_widest_digit (widths, seconds % 10);
+       else
+               s2 = get_widest_digit (widths, 5);
+       if (minutes > 9) {
+               m = get_widest_digit (widths, 9);
+               m += get_widest_digit (widths, minutes % 10) * 10;
+               format = "%02d:%d%d/%d:%02d";
+       } else {
+               m = get_widest_digit (widths, minutes);
+       }
+
+       return g_strdup_printf (format, m, s2, s1, minutes, seconds);
+}
+
+static void
+set_time_label_width (EggPlayPreview *play_preview)
+{
+       EggPlayPreviewPrivate *priv;
+       int widths[10];
+       int w;
+       gchar *s;
+
+       priv = GET_PRIVATE (play_preview);
+       g_object_set (priv->time_label, "width-request", -1, NULL);
+       calculate_widths (priv->time_label, widths);
+       s = get_widest_time (widths, priv->duration);
+       gtk_label_set_text (GTK_LABEL (priv->time_label), s);
+       gtk_widget_get_preferred_width (priv->time_label, NULL, &w);
+       g_object_set (priv->time_label, "width-request", w, NULL);
+       g_free (s);
+       _ui_update_duration (play_preview);
+}
+
+static void
+_duration_notify_cb (EggPlayPreview *play_preview,
+                                        GParamSpec     *pspec,
+                                        gpointer        user_data)
+{
+       set_time_label_width (play_preview);
+}
+
+static void
+_style_updated_cb (GtkWidget *widget,
+                                  gpointer   user_data)
+{
+       set_time_label_width (user_data);
+}
+
 static gboolean
 _timeout_cb (EggPlayPreview *play_preview)
 {
@@ -604,7 +707,6 @@ _process_bus_messages (GstBus *bus, GstMessage *msg, EggPlayPreview *play_previe
 
                priv->duration = duration;
                g_object_notify (G_OBJECT (play_preview), "duration");
-               _ui_update_duration (play_preview);
                break;
 
        case GST_MESSAGE_EOS: