[nautilus/wip/antoniof/local_vs_native_fixup: 78/90] file: Deduplicate speed tradeoff code

[Ondrej Holy <oholy src gnome org>]

commit 1ef42ee77ccc11f7131ff002a6061f70ee879bb5
Author: António Fernandes <antoniof gnome org>
Date:   Mon May 11 12:13:49 2020 +0100

    file: Deduplicate speed tradeoff code
    
    The nautilus_file_should_show_thumbnail() method was first introduced
    in commit 469047a2a58430026d68a3b99b223b922b18b8d1
    
    It duplicated the tradeoff setting logic that was already present in
    get_speed_tradeoff_preference_for_file(), a shared function for both
    top left text preview and child directories item count.
    (Top left text preview has since been phased out.)
    
    The code duplication grew when support for the filesystem::use-preview
    attribute was added in commit 00e59a6b3c10ec4c3915b61d09498b4110189917
    
    Instead, let's make should_show_thumbnail() use the shared function.

 src/nautilus-file.c | 102 +++++++++++++++++-----------------------------------
 1 file changed, 33 insertions(+), 69 deletions(-)
---
diff --git a/src/nautilus-file.c b/src/nautilus-file.c
index a9047d3de..817241a21 100644
--- a/src/nautilus-file.c
+++ b/src/nautilus-file.c
@@ -4744,31 +4744,17 @@ nautilus_file_get_filesystem_remote (NautilusFile *file)
     return FALSE;
 }
 
-gboolean
-nautilus_file_should_show_thumbnail (NautilusFile *file)
+static gboolean
+get_speed_tradeoff_preference_for_file (NautilusFile               *file,
+                                        NautilusSpeedTradeoffValue  value)
 {
-    const char *mime_type;
     GFilesystemPreviewType use_preview;
 
-    use_preview = nautilus_file_get_filesystem_use_preview (file);
-
-    mime_type = file->details->mime_type;
-    if (mime_type == NULL)
-    {
-        mime_type = "application/octet-stream";
-    }
+    g_return_val_if_fail (NAUTILUS_IS_FILE (file), FALSE);
 
-    /* If the thumbnail has already been created, don't care about the size
-     * of the original file.
-     */
-    if (nautilus_thumbnail_is_mimetype_limited_by_size (mime_type) &&
-        file->details->thumbnail_path == NULL &&
-        nautilus_file_get_size (file) > cached_thumbnail_limit)
-    {
-        return FALSE;
-    }
+    use_preview = nautilus_file_get_filesystem_use_preview (file);
 
-    if (show_file_thumbs == NAUTILUS_SPEED_TRADEOFF_ALWAYS)
+    if (value == NAUTILUS_SPEED_TRADEOFF_ALWAYS)
     {
         if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_NEVER)
         {
@@ -4779,15 +4765,15 @@ nautilus_file_should_show_thumbnail (NautilusFile *file)
             return TRUE;
         }
     }
-    else if (show_file_thumbs == NAUTILUS_SPEED_TRADEOFF_NEVER)
+    else if (value == NAUTILUS_SPEED_TRADEOFF_NEVER)
     {
         return FALSE;
     }
-    else
+    else if (value == NAUTILUS_SPEED_TRADEOFF_LOCAL_ONLY)
     {
         if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_NEVER)
         {
-            /* file system says to never thumbnail anything */
+            /* file system says to never preview anything */
             return FALSE;
         }
         else if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_IF_LOCAL)
@@ -4805,6 +4791,30 @@ nautilus_file_should_show_thumbnail (NautilusFile *file)
     return FALSE;
 }
 
+gboolean
+nautilus_file_should_show_thumbnail (NautilusFile *file)
+{
+    const char *mime_type;
+
+    mime_type = file->details->mime_type;
+    if (mime_type == NULL)
+    {
+        mime_type = "application/octet-stream";
+    }
+
+    /* If the thumbnail has already been created, don't care about the size
+     * of the original file.
+     */
+    if (nautilus_thumbnail_is_mimetype_limited_by_size (mime_type) &&
+        file->details->thumbnail_path == NULL &&
+        nautilus_file_get_size (file) > cached_thumbnail_limit)
+    {
+        return FALSE;
+    }
+
+    return get_speed_tradeoff_preference_for_file (file, show_file_thumbs);
+}
+
 static gboolean
 nautilus_is_video_file (NautilusFile *file)
 {
@@ -5660,52 +5670,6 @@ show_directory_item_count_changed_callback (gpointer callback_data)
     show_directory_item_count = g_settings_get_enum (nautilus_preferences, 
NAUTILUS_PREFERENCES_SHOW_DIRECTORY_ITEM_COUNTS);
 }
 
-static gboolean
-get_speed_tradeoff_preference_for_file (NautilusFile               *file,
-                                        NautilusSpeedTradeoffValue  value)
-{
-    GFilesystemPreviewType use_preview;
-
-    g_return_val_if_fail (NAUTILUS_IS_FILE (file), FALSE);
-
-    use_preview = nautilus_file_get_filesystem_use_preview (file);
-
-    if (value == NAUTILUS_SPEED_TRADEOFF_ALWAYS)
-    {
-        if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_NEVER)
-        {
-            return FALSE;
-        }
-        else
-        {
-            return TRUE;
-        }
-    }
-
-    if (value == NAUTILUS_SPEED_TRADEOFF_NEVER)
-    {
-        return FALSE;
-    }
-
-    g_assert (value == NAUTILUS_SPEED_TRADEOFF_LOCAL_ONLY);
-
-    if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_NEVER)
-    {
-        /* file system says to never preview anything */
-        return FALSE;
-    }
-    else if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_IF_LOCAL)
-    {
-        /* file system says we should treat file as if it's local */
-        return TRUE;
-    }
-    else
-    {
-        /* only local files */
-        return !nautilus_file_is_remote (file);
-    }
-}
-
 gboolean
 nautilus_file_should_show_directory_item_count (NautilusFile *file)
 {