[evolution] Show preview of imported data in import assistant

[Milan Crha <mcrha src gnome org>]

commit 09a7a531686ee4819964b510be0911a98f2e1de6
Author: Milan Crha <mcrha redhat com>
Date:   Fri Oct 2 10:22:30 2020 +0200

    Show preview of imported data in import assistant
    
    This already worked when importing from a command line, but not
    when importing from the Evolution.

 src/e-util/e-import-assistant.c | 43 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
---
diff --git a/src/e-util/e-import-assistant.c b/src/e-util/e-import-assistant.c
index 982927461a..397de8aec4 100644
--- a/src/e-util/e-import-assistant.c
+++ b/src/e-util/e-import-assistant.c
@@ -51,6 +51,7 @@ typedef struct _ImportSimplePage ImportSimplePage;
 struct _ImportFilePage {
        GtkWidget *filename;
        GtkWidget *filetype;
+       GtkWidget *preview_scrolled_window;
 
        EImportTargetURI *target;
        EImportImporter *importer;
@@ -152,12 +153,18 @@ filename_changed (GtkWidget *widget,
 {
        EImportAssistantPrivate *priv;
        ImportFilePage *page;
+       GtkWidget *child;
        const gchar *filename;
        gint fileok;
 
        priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);
        page = &priv->file_page;
 
+       child = gtk_bin_get_child (GTK_BIN (page->preview_scrolled_window));
+
+       if (child)
+               gtk_widget_destroy (child);
+
        filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (widget));
 
        fileok =
@@ -171,6 +178,7 @@ filename_changed (GtkWidget *widget,
                GSList *l;
                EImportImporter *first = NULL;
                gint i = 0, firstitem = 0;
+               gboolean importer_can_handle = FALSE;
 
                g_free (page->target->uri_src);
                page->target->uri_src = g_filename_to_uri (filename, NULL, NULL);
@@ -188,6 +196,11 @@ filename_changed (GtkWidget *widget,
                                if (first == NULL) {
                                        firstitem = i;
                                        first = eii;
+
+                                       if (!page->importer || page->importer == eii)
+                                               importer_can_handle = TRUE;
+                               } else if (page->importer == eii) {
+                                       importer_can_handle = TRUE;
                                }
                                gtk_list_store_set (GTK_LIST_STORE (model), &iter, 1, TRUE, -1);
                        } else {
@@ -203,7 +216,15 @@ filename_changed (GtkWidget *widget,
                if (page->importer == NULL && first) {
                        page->importer = first;
                        gtk_combo_box_set_active (GTK_COMBO_BOX (page->filetype), firstitem);
+               } else if (page->importer && importer_can_handle) {
+                       GtkWidget *preview;
+
+                       preview = e_import_get_preview_widget (priv->import, (EImportTarget *) page->target, 
page->importer);
+
+                       if (preview)
+                               gtk_container_add (GTK_CONTAINER (page->preview_scrolled_window), preview);
                }
+
                fileok = first != NULL;
        } else {
                GtkTreeIter iter;
@@ -218,6 +239,8 @@ filename_changed (GtkWidget *widget,
                }
        }
 
+       gtk_widget_set_visible (page->preview_scrolled_window, gtk_bin_get_child (GTK_BIN 
(page->preview_scrolled_window)) != NULL);
+
        widget = gtk_assistant_get_nth_page (assistant, PAGE_FILE_CHOOSE);
        gtk_assistant_set_page_complete (assistant, widget, fileok);
 }
@@ -325,6 +348,26 @@ import_assistant_file_page_init (EImportAssistant *import_assistant)
                GTK_CELL_LAYOUT (widget), cell,
                "text", 0, "sensitive", 1, NULL);
 
+       row++;
+
+       widget = gtk_label_new_with_mnemonic (_("Pre_view:"));
+       gtk_misc_set_alignment (GTK_MISC (widget), 1, 0);
+       gtk_table_attach (
+               GTK_TABLE (container), widget,
+               0, 1, row, row + 1, GTK_FILL, GTK_FILL, 0, 0);
+
+       label = widget;
+
+       widget = gtk_scrolled_window_new (NULL, NULL);
+       gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (widget), GTK_SHADOW_IN);
+       gtk_label_set_mnemonic_widget (GTK_LABEL (label), widget);
+       gtk_table_attach (
+               GTK_TABLE (container), widget,
+               1, 2, row, row + 1, GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
+       import_assistant->priv->file_page.preview_scrolled_window = widget;
+
+       e_binding_bind_property (widget, "visible", label, "visible", G_BINDING_DEFAULT);
+
        return page;
 }