[nautilus/wip/antoniof/gnome-42: 66/72] Revert "properties-window: Don't set filechooser preview"

[António Fernandes <antoniof src gnome org>]

commit 733fb6bc8d16a605d1610c5c6873a4804d10af5a
Author: António Fernandes <antoniof gnome org>
Date:   Fri Feb 11 19:06:18 2022 +0000

    Revert "properties-window: Don't set filechooser preview"
    
    This reverts commit 34d0d8669ad32d566c4024f1647ed7090cd40924.

 src/nautilus-properties-window.c | 56 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 55 insertions(+), 1 deletion(-)
---
diff --git a/src/nautilus-properties-window.c b/src/nautilus-properties-window.c
index 320501feb..c3bdce5de 100644
--- a/src/nautilus-properties-window.c
+++ b/src/nautilus-properties-window.c
@@ -49,6 +49,8 @@
 #include "nautilus-ui-utilities.h"
 #include "nautilus-signaller.h"
 
+#define PREVIEW_IMAGE_WIDTH 96
+
 static GHashTable *windows;
 static GHashTable *pending_lists;
 
@@ -5175,6 +5177,49 @@ set_icon (const char               *icon_uri,
     }
 }
 
+static void
+update_preview_callback (GtkFileChooser           *icon_chooser,
+                         NautilusPropertiesWindow *self)
+{
+    GtkWidget *preview_widget;
+    g_autoptr (GdkPixbuf) pixbuf = NULL;
+    g_autofree char *filename = NULL;
+
+    filename = gtk_file_chooser_get_filename (icon_chooser);
+    if (filename != NULL)
+    {
+        pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
+    }
+
+    if (pixbuf != NULL)
+    {
+        preview_widget = gtk_file_chooser_get_preview_widget (icon_chooser);
+        gtk_file_chooser_set_preview_widget_active (icon_chooser, TRUE);
+
+        if (gdk_pixbuf_get_width (pixbuf) > PREVIEW_IMAGE_WIDTH)
+        {
+            double scale;
+            GdkPixbuf *scaled_pixbuf;
+
+            scale = (double) gdk_pixbuf_get_height (pixbuf) /
+                    gdk_pixbuf_get_width (pixbuf);
+
+            scaled_pixbuf = gdk_pixbuf_scale_simple (pixbuf,
+                                                     PREVIEW_IMAGE_WIDTH,
+                                                     scale * PREVIEW_IMAGE_WIDTH,
+                                                     GDK_INTERP_BILINEAR);
+            g_object_unref (pixbuf);
+            pixbuf = scaled_pixbuf;
+        }
+
+        gtk_image_set_from_pixbuf (GTK_IMAGE (preview_widget), pixbuf);
+    }
+    else
+    {
+        gtk_file_chooser_set_preview_widget_active (icon_chooser, FALSE);
+    }
+}
+
 static void
 custom_icon_file_chooser_response_cb (GtkDialog                *dialog,
                                       gint                      response,
@@ -5219,7 +5264,7 @@ static void
 select_image_button_callback (GtkWidget                *widget,
                               NautilusPropertiesWindow *self)
 {
-    GtkWidget *dialog;
+    GtkWidget *dialog, *preview;
     GtkFileFilter *filter;
     GList *l;
     NautilusFile *file;
@@ -5247,6 +5292,15 @@ select_image_button_callback (GtkWidget                *widget,
         gtk_file_filter_add_pixbuf_formats (filter);
         gtk_file_chooser_set_filter (GTK_FILE_CHOOSER (dialog), filter);
 
+        preview = gtk_image_new ();
+        gtk_widget_set_size_request (preview, PREVIEW_IMAGE_WIDTH, -1);
+        gtk_file_chooser_set_preview_widget (GTK_FILE_CHOOSER (dialog), preview);
+        gtk_file_chooser_set_use_preview_label (GTK_FILE_CHOOSER (dialog), FALSE);
+        gtk_file_chooser_set_preview_widget_active (GTK_FILE_CHOOSER (dialog), FALSE);
+
+        g_signal_connect (dialog, "update-preview",
+                          G_CALLBACK (update_preview_callback), self);
+
         self->icon_chooser = dialog;
 
         g_object_add_weak_pointer (G_OBJECT (dialog),