[gnumeric] Clipboard: accept uri list for image pasting.

[Morten Welinder <mortenw src gnome org>]

commit 34c758e26627b56f948246eea455dd230491eb8c
Author: Morten Welinder <terra gnome org>
Date:   Sat Apr 21 18:49:22 2018 -0400

    Clipboard: accept uri list for image pasting.

 NEWS                |    1 +
 src/gui-clipboard.c |   69 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 7e0463b..ec3f1c5 100644
--- a/NEWS
+++ b/NEWS
@@ -17,6 +17,7 @@ Morten:
        * Allow inter-process paste-special.  [#346630]
        * Fix ssconvert --merge-to problem with names.  [#795408]
        * Fix problem with image pasting.
+       * Allow pasting an image into Gnumeric.  [#366816]
 
 --------------------------------------------------------------------------
 Gnumeric 1.12.39
diff --git a/src/gui-clipboard.c b/src/gui-clipboard.c
index fbd2aa2..5a36fc5 100644
--- a/src/gui-clipboard.c
+++ b/src/gui-clipboard.c
@@ -90,6 +90,10 @@ enum {
        ATOM_IMAGE_JPEG,
        ATOM_IMAGE_BMP,
        // ----------
+       ATOM_TEXT_URI_LIST,
+       ATOM_GNOME_COPIED_FILES,
+       ATOM_KDE_CUT_FILES,
+       // ----------
        ATOM_SAVE_TARGETS,
 };
 
@@ -120,6 +124,10 @@ static const char *const atom_names[] = {
        "image/jpeg",
        "image/bmp",
        // ----------
+       "text/uri-list",
+       "x-special/gnome-copied-files",
+       "application/x-kde-cutselection",
+       // ----------
        "SAVE_TARGETS",
 };
 
@@ -498,6 +506,49 @@ image_content_received (GtkClipboard *clipboard, GtkSelectionData *sel,
 }
 
 static void
+urilist_content_received (GtkClipboard *clipboard, GtkSelectionData *sel,
+                         gpointer closure)
+{
+       GnmGtkClipboardCtxt *ctxt = closure;
+       WBCGtk *wbcg = ctxt->wbcg;
+       GnmPasteTarget *pt = ctxt->paste_target;
+       int sel_len = gtk_selection_data_get_length (sel);
+
+       paste_to_gnumeric (sel, "urilist");
+
+       if (sel_len > 0) {
+               char *text = g_strndup (gtk_selection_data_get_data (sel), sel_len);
+               GSList *uris = go_file_split_urls (text);
+               GSList *l;
+               g_free (text);
+
+               for (l = uris; l; l = l->next) {
+                       const char *uri = l->data;
+                       GsfInput *input;
+                       gsf_off_t size;
+                       gconstpointer data;
+
+                       if (g_str_equal (uri, "copy"))
+                               continue;
+                       input = go_file_open (uri, NULL);
+                       if (!input)
+                               continue;
+                       size = gsf_input_size (input);
+                       data = gsf_input_read (input, size, NULL);
+                       if (data)
+                               scg_paste_image (wbcg_cur_scg (wbcg), &pt->range,
+                                                data, size);
+                       g_object_unref (input);
+               }
+
+               g_slist_free_full (uris, g_free);
+
+       }
+
+       gnm_gtk_clipboard_context_free (ctxt);
+}
+
+static void
 parse_ms_headers (const char *data, size_t length, size_t *start, size_t *end)
 {
        GHashTable *headers = g_hash_table_new_full
@@ -690,6 +741,13 @@ x_targets_received (GtkClipboard *clipboard, GdkAtom *targets,
        };
 
        // In order of preference
+       static const int uri_list_fmts[] = {
+               ATOM_TEXT_URI_LIST,
+               ATOM_GNOME_COPIED_FILES,
+               ATOM_KDE_CUT_FILES,
+       };
+
+       // In order of preference
        static const int string_fmts[] = {
                ATOM_UTF8_STRING,
                ATOM_STRING,
@@ -738,6 +796,17 @@ x_targets_received (GtkClipboard *clipboard, GdkAtom *targets,
                }
        }
 
+       // Try a uri list format
+       for (ui = 0; ui < G_N_ELEMENTS (uri_list_fmts); ui++) {
+               GdkAtom atom = atoms[uri_list_fmts[ui]];
+               if (find_in_table (targets, n_targets, atom)) {
+                       gtk_clipboard_request_contents (clipboard, atom,
+                                                       urilist_content_received,
+                                                       ctxt);
+                       return;
+               }
+       }
+
        // Try a string format
        for (ui = 0; ui < G_N_ELEMENTS (string_fmts); ui++) {
                GdkAtom atom = atoms[string_fmts[ui]];