UI: Confirm dialog when closing an unsaved file

The complexity in this patch comes from the fact
that the current operator system does not support
multi-step user interactions well.

More specifically, for this to work, we need to show
a confirm dialog and a file browser afterwards.
We decided that it is easier to keep everything in
a single operator, instead of creating separate
operators that invoke each other.

So, now the `WM_OT_open_mainfile` operator invokes
itself in different states. It implements a simple
finite state machine to manage the states.

The dialog itself is expected to be improved in
a future commit. See D4829 for more details.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D4829

1 files changed, 11 insertions, 6 deletions

diff --git a/source/blender/editors/interface/interface_templates.c b/source/blender/editors/interface/interface_templates.c
index 40c85217bb3..9e91505f5e8 100644
--- a/source/blender/editors/interface/interface_templates.c
+++ b/source/blender/editors/interface/interface_templates.c
@@ -6761,12 +6761,17 @@ int uiTemplateRecentFiles(uiLayout *layout, int rows)
 
   for (recent = G.recent_files.first, i = 0; (i < rows) && (recent); recent = recent->next, i++) {
     const char *filename = BLI_path_basename(recent->filepath);
-    uiItemStringO(layout,
-                  filename,
-                  BLO_has_bfile_extension(filename) ? ICON_FILE_BLEND : ICON_FILE_BACKUP,
-                  "WM_OT_open_mainfile",
-                  "filepath",
-                  recent->filepath);
+    PointerRNA ptr;
+    uiItemFullO(layout,
+                "WM_OT_open_mainfile",
+                filename,
+                BLO_has_bfile_extension(filename) ? ICON_FILE_BLEND : ICON_FILE_BACKUP,
+                NULL,
+                WM_OP_INVOKE_DEFAULT,
+                0,
+                &ptr);
+    RNA_string_set(&ptr, "filepath", recent->filepath);
+    RNA_boolean_set(&ptr, "display_file_selector", false);
   }
 
   return i;