[gtk+] GtkFileChooserNativeWin32: add support for get_filter and set_filter

[Matthias Clasen <matthiasc src gnome org>]

commit 0e7d6bb71e0afe56f88c697105e5288ab7fa19e8
Author: Tom Schoonjans <Tom Schoonjans diamond ac uk>
Date:   Thu Jul 13 20:07:22 2017 +0100

    GtkFileChooserNativeWin32: add support for get_filter and set_filter
    
    https://bugzilla.gnome.org/show_bug.cgi?id=784723

 gtk/gtkfilechoosernativewin32.c |   42 +++++++++++++++++++++++++++++++++++++-
 1 files changed, 40 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkfilechoosernativewin32.c b/gtk/gtkfilechoosernativewin32.c
index 9a1a3a2..cb9c42e 100644
--- a/gtk/gtkfilechoosernativewin32.c
+++ b/gtk/gtkfilechoosernativewin32.c
@@ -103,6 +103,7 @@ typedef struct {
   gboolean got_hwnd;
   HWND dialog_hwnd;
   gboolean do_close; /* Set if hide was called before dialog_hwnd was set */
+  FilechooserWin32ThreadData *data;
 } FileDialogEvents;
 
 
@@ -235,6 +236,19 @@ static HRESULT STDMETHODCALLTYPE
 ifiledialogevents_OnTypeChange (IFileDialogEvents * self,
                                 IFileDialog *pfd)
 {
+  FileDialogEvents *events = (FileDialogEvents *) self;
+  UINT fileType;
+  HRESULT hr = IFileDialog_GetFileTypeIndex (pfd, &fileType);
+  if (FAILED (hr))
+    {
+      g_warning_hr ("Can't get current file type", hr);
+      return S_OK;
+    }
+  fileType--; // fileTypeIndex starts at 1 
+  GSList *filters = gtk_file_chooser_list_filters (GTK_FILE_CHOOSER (events->data->self));
+  events->data->self->current_filter = g_slist_nth_data (filters, fileType);
+  g_slist_free (filters);
+  g_object_notify (G_OBJECT (events->data->self), "filter");
   return S_OK;
 }
 
@@ -276,7 +290,7 @@ file_dialog_events_send_close (IFileDialogEvents *self)
 }
 
 static IFileDialogEvents *
-file_dialog_events_new (gboolean enable_owner)
+file_dialog_events_new (gboolean enable_owner, FilechooserWin32ThreadData *data)
 {
   FileDialogEvents *events;
 
@@ -284,6 +298,7 @@ file_dialog_events_new (gboolean enable_owner)
   events->iFileDialogEvents.lpVtbl = &ifde_vtbl;
   events->ref_count = 1;
   events->enable_owner = enable_owner;
+  events->data = data;
 
   return &events->iFileDialogEvents;
 }
@@ -553,6 +568,24 @@ filechooser_win32_thread (gpointer _data)
       hr = IFileDialog_SetFileTypes (pfd, n, data->filters);
       if (FAILED (hr))
         g_warning_hr ("Can't set file types", hr);
+
+      if (data->self->current_filter)
+        {
+          GSList *filters = gtk_file_chooser_list_filters (GTK_FILE_CHOOSER (data->self));
+         gint current_filter_index = g_slist_index (filters, data->self->current_filter);
+         g_slist_free (filters);
+
+         if (current_filter_index >= 0)
+           hr = IFileDialog_SetFileTypeIndex (pfd, current_filter_index + 1);
+         else
+           hr = IFileDialog_SetFileTypeIndex (pfd, 1);
+        }
+      else
+        {
+         hr = IFileDialog_SetFileTypeIndex (pfd, 1);
+        }
+      if (FAILED (hr))
+        g_warning_hr ("Can't set current file type", hr);
     }
 
   data->response = GTK_RESPONSE_CANCEL;
@@ -716,6 +749,11 @@ gtk_file_chooser_native_win32_show (GtkFileChooserNative *self)
               return FALSE;
             }
         }
+      self->current_filter = gtk_file_chooser_get_filter (GTK_FILE_CHOOSER (self));
+    }
+  else
+    {
+      self->current_filter = NULL;
     }
 
   self->mode_data = data;
@@ -772,7 +810,7 @@ gtk_file_chooser_native_win32_show (GtkFileChooserNative *self)
         data->current_name = g_strdup (self->current_name);
     }
 
-  data->events = file_dialog_events_new (!data->modal);
+  data->events = file_dialog_events_new (!data->modal, data);
 
   thread = g_thread_new ("win32 filechooser", filechooser_win32_thread, data);
   if (thread == NULL)