[gtk+] Return error instead of showing an error dialog when printing

[Marek Kašík <mkasik src gnome org>]

commit ca6aacc32d8141c0d6ebbf8c1ed6152764232bae
Author: Marek Kasik <mkasik redhat com>
Date:   Mon Jun 7 14:52:38 2010 +0200

    Return error instead of showing an error dialog when printing
    
    Remove message dialogs showing an error when printing. Return
    GTK_PRINT_OPERATION_RESULT_ERROR and set error in such a case.
    Also return GTK_PRINT_OPERATION_RESULT_CANCEL when cancelled.
    Do it for synchronous and asynchronous cases (#549127).

 gtk/gtkprintjob.h            |    6 ++--
 gtk/gtkprintoperation-unix.c |   42 +++++++----------------------------
 gtk/gtkprintoperation.c      |   48 +++++++++++++++++++++++++++++++++++-------
 3 files changed, 52 insertions(+), 44 deletions(-)
---
diff --git a/gtk/gtkprintjob.h b/gtk/gtkprintjob.h
index 9d2c25b..e1c5845 100644
--- a/gtk/gtkprintjob.h
+++ b/gtk/gtkprintjob.h
@@ -42,9 +42,9 @@ typedef struct _GtkPrintJob          GtkPrintJob;
 typedef struct _GtkPrintJobClass     GtkPrintJobClass;
 typedef struct _GtkPrintJobPrivate   GtkPrintJobPrivate;
 
-typedef void (*GtkPrintJobCompleteFunc) (GtkPrintJob *print_job,
-                                         gpointer     user_data,
-                                         GError      *error);
+typedef void (*GtkPrintJobCompleteFunc) (GtkPrintJob  *print_job,
+                                         gpointer      user_data,
+                                         const GError *error);
 
 struct _GtkPrinter;
 
diff --git a/gtk/gtkprintoperation-unix.c b/gtk/gtkprintoperation-unix.c
index dbf6228..896871a 100644
--- a/gtk/gtkprintoperation-unix.c
+++ b/gtk/gtkprintoperation-unix.c
@@ -306,20 +306,10 @@ _gtk_print_operation_platform_backend_launch_preview (GtkPrintOperation *op,
  out:
   if (error != NULL)
     {
-      GtkWidget *edialog;
-      edialog = gtk_message_dialog_new (parent, 
-                                        GTK_DIALOG_DESTROY_WITH_PARENT,
-                                        GTK_MESSAGE_ERROR,
-                                        GTK_BUTTONS_CLOSE,
-                                        _("Error launching preview") /* FIXME better text */);
-      gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (edialog),
-                                                "%s", error->message);
-      g_signal_connect (edialog, "response",
-                        G_CALLBACK (gtk_widget_destroy), NULL);
-
-      gtk_window_present (GTK_WINDOW (edialog));
-
-      g_error_free (error);
+      if (op->priv->error == NULL)
+        op->priv->error = error;
+      else
+        g_error_free (error);
 
       filename_used = FALSE; 
       settings_used = FALSE;
@@ -341,29 +331,15 @@ _gtk_print_operation_platform_backend_launch_preview (GtkPrintOperation *op,
 }
 
 static void
-unix_finish_send  (GtkPrintJob *job,
-                   gpointer     user_data, 
-                   GError      *error)
+unix_finish_send  (GtkPrintJob  *job,
+                   gpointer      user_data, 
+                   const GError *error)
 {
   GtkPrintOperation *op = (GtkPrintOperation *) user_data;
   GtkPrintOperationUnix *op_unix = op->priv->platform_data;
 
-  if (error != NULL)
-    {
-      GtkWidget *edialog;
-      edialog = gtk_message_dialog_new (op_unix->parent, 
-                                        GTK_DIALOG_DESTROY_WITH_PARENT,
-                                        GTK_MESSAGE_ERROR,
-                                        GTK_BUTTONS_CLOSE,
-                                        _("Error printing") /* FIXME better text */);
-      gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (edialog),
-                                                "%s", error->message);
-      gtk_window_set_modal (GTK_WINDOW (edialog), TRUE);
-      g_signal_connect (edialog, "response",
-                        G_CALLBACK (gtk_widget_destroy), NULL);
-
-      gtk_window_present (GTK_WINDOW (edialog));
-    }
+  if (error != NULL && op->priv->error == NULL)
+    op->priv->error = g_error_copy (error);
 
   op_unix->data_sent = TRUE;
 
diff --git a/gtk/gtkprintoperation.c b/gtk/gtkprintoperation.c
index b6a77b4..a633bcd 100644
--- a/gtk/gtkprintoperation.c
+++ b/gtk/gtkprintoperation.c
@@ -205,6 +205,7 @@ static void
 preview_iface_end_preview (GtkPrintOperationPreview *preview)
 {
   GtkPrintOperation *op;
+  GtkPrintOperationResult result;
   
   op = GTK_PRINT_OPERATION (preview);
 
@@ -218,7 +219,14 @@ preview_iface_end_preview (GtkPrintOperationPreview *preview)
   
   _gtk_print_operation_set_status (op, GTK_PRINT_STATUS_FINISHED, NULL);
 
-  g_signal_emit (op, signals[DONE], 0, GTK_PRINT_OPERATION_RESULT_APPLY);
+  if (op->priv->error)
+    result = GTK_PRINT_OPERATION_RESULT_ERROR;
+  else if (op->priv->cancelled)
+    result = GTK_PRINT_OPERATION_RESULT_CANCEL;
+  else
+    result = GTK_PRINT_OPERATION_RESULT_APPLY;
+
+  g_signal_emit (op, signals[DONE], 0, result);
 }
 
 static gboolean
@@ -2228,10 +2236,18 @@ print_pages_idle_done (gpointer user_data)
     g_main_loop_quit (priv->rloop);
 
   if (!data->is_preview)
-    g_signal_emit (data->op, signals[DONE], 0,
-		   priv->cancelled ?
-		   GTK_PRINT_OPERATION_RESULT_CANCEL :
-		   GTK_PRINT_OPERATION_RESULT_APPLY);
+    {
+      GtkPrintOperationResult result;
+
+      if (priv->error)
+        result = GTK_PRINT_OPERATION_RESULT_ERROR;
+      else if (priv->cancelled)
+        result = GTK_PRINT_OPERATION_RESULT_CANCEL;
+      else
+        result = GTK_PRINT_OPERATION_RESULT_APPLY;
+
+      g_signal_emit (data->op, signals[DONE], 0, result);
+    }
   
   g_object_unref (data->op);
   g_free (data->pages);
@@ -2854,8 +2870,19 @@ print_pages (GtkPrintOperation       *op,
  
   if (!do_print) 
     {
+      GtkPrintOperationResult tmp_result;
+
       _gtk_print_operation_set_status (op, GTK_PRINT_STATUS_FINISHED_ABORTED, NULL);
-      g_signal_emit (op, signals[DONE], 0, result);
+
+      if (priv->error)
+        tmp_result = GTK_PRINT_OPERATION_RESULT_ERROR;
+      else if (priv->cancelled)
+        tmp_result = GTK_PRINT_OPERATION_RESULT_CANCEL;
+      else
+        tmp_result = result;
+
+      g_signal_emit (op, signals[DONE], 0, tmp_result);
+
       return;
   }
   
@@ -3132,8 +3159,13 @@ gtk_print_operation_run (GtkPrintOperation        *op,
     print_pages (op, parent, do_print, result);
 
   if (priv->error && error)
-    *error = g_error_copy (priv->error);
-  
+    {
+      *error = g_error_copy (priv->error);
+      result = GTK_PRINT_OPERATION_RESULT_ERROR;
+    }
+  else if (priv->cancelled)
+    result = GTK_PRINT_OPERATION_RESULT_CANCEL;
+ 
   return result;
 }