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path: root/e-util/evolution-source-viewer.c
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/*
 * evolution-source-viewer.c
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <config.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>

#include <libedataserver/libedataserver.h>

#include "e-dialog-widgets.h"

/* XXX Even though this is all one file, I'm still being pedantic about data
 *     encapsulation (except for a private struct, even I'm not that anal!).
 *     I expect this program will eventually be too complex for one file
 *     and we'll want to split off an e-source-viewer.[ch]. */

/* Standard GObject macros */
#define E_TYPE_SOURCE_VIEWER \
    (e_source_viewer_get_type ())
#define E_SOURCE_VIEWER(obj) \
    (G_TYPE_CHECK_INSTANCE_CAST \
    ((obj), E_TYPE_SOURCE_VIEWER, ESourceViewer))
#define E_SOURCE_VIEWER_CLASS(cls) \
    (G_TYPE_CHECK_CLASS_CAST \
    ((cls), E_TYPE_SOURCE_VIEWER, ESourceViewerClass))
#define E_IS_SOURCE_VIEWER(obj) \
    (G_TYPE_CHECK_INSTANCE_TYPE \
    ((obj), E_TYPE_SOURCE_VIEWER))
#define E_IS_SOURCE_VIEWER_CLASS(cls) \
    (G_TYPE_CHECK_CLASS_TYPE \
    ((cls), E_TYPE_SOURCE_VIEWER))
#define E_SOURCE_VIEWER_GET_CLASS(obj) \
    (G_TYPE_INSTANCE_GET_CLASS \
    ((obj), E_TYPE_SOURCE_VIEWER, ESourceViewerClass))

typedef struct _ESourceViewer ESourceViewer;
typedef struct _ESourceViewerClass ESourceViewerClass;

struct _ESourceViewer {
    GtkWindow parent;
    ESourceRegistry *registry;

    GtkTreeStore *tree_store;
    GHashTable *source_index;

    GCancellable *delete_operation;

    GtkWidget *tree_view;       /* not referenced */
    GtkWidget *text_view;       /* not referenced */
    GtkWidget *top_panel;       /* not referenced */

    /* Viewing Page */
    GtkWidget *viewing_label;   /* not referenced */
    GtkWidget *delete_button;   /* not referenced */

    /* Deleting Page */
    GtkWidget *deleting_label;  /* not referenced */
    GtkWidget *deleting_cancel; /* not referenced */
};

struct _ESourceViewerClass {
    GtkWindowClass parent_class;
};

enum {
    PAGE_VIEWING,
    PAGE_DELETING
};

enum {
    PROP_0,
    PROP_REGISTRY
};

enum {
    COLUMN_DISPLAY_NAME,
    COLUMN_SOURCE_UID,
    COLUMN_REMOVABLE,
    COLUMN_WRITABLE,
    COLUMN_REMOTE_CREATABLE,
    COLUMN_REMOTE_DELETABLE,
    COLUMN_SOURCE,
    NUM_COLUMNS
};

/* Forward Declarations */
GType       e_source_viewer_get_type    (void) G_GNUC_CONST;
GtkWidget * e_source_viewer_new     (GCancellable *cancellable,
                         GError **error);
ESourceRegistry *
        e_source_viewer_get_registry    (ESourceViewer *viewer);
GtkTreePath *   e_source_viewer_dup_selected_path
                        (ESourceViewer *viewer);
gboolean    e_source_viewer_set_selected_path
                        (ESourceViewer *viewer,
                         GtkTreePath *path);
ESource *   e_source_viewer_ref_selected_source
                        (ESourceViewer *viewer);
gboolean    e_source_viewer_set_selected_source
                        (ESourceViewer *viewer,
                         ESource *source);
GNode *     e_source_viewer_build_display_tree
                        (ESourceViewer *viewer);

static void e_source_viewer_initable_init   (GInitableIface *iface);

G_DEFINE_TYPE_WITH_CODE (
    ESourceViewer,
    e_source_viewer,
    GTK_TYPE_WINDOW,
    G_IMPLEMENT_INTERFACE (
        G_TYPE_INITABLE,
        e_source_viewer_initable_init));

static GIcon *
source_view_new_remote_creatable_icon (void)
{
    GEmblem *emblem;
    GIcon *emblem_icon;
    GIcon *folder_icon;
    GIcon *icon;

    emblem_icon = g_themed_icon_new ("emblem-new");
    folder_icon = g_themed_icon_new ("folder-remote");

    emblem = g_emblem_new (emblem_icon);
    icon = g_emblemed_icon_new (folder_icon, emblem);
    g_object_unref (emblem);

    g_object_unref (folder_icon);
    g_object_unref (emblem_icon);

    return icon;
}

static GIcon *
source_view_new_remote_deletable_icon (void)
{
    GEmblem *emblem;
    GIcon *emblem_icon;
    GIcon *folder_icon;
    GIcon *icon;

    emblem_icon = g_themed_icon_new ("edit-delete");
    folder_icon = g_themed_icon_new ("folder-remote");

    emblem = g_emblem_new (emblem_icon);
    icon = g_emblemed_icon_new (folder_icon, emblem);
    g_object_unref (emblem);

    g_object_unref (folder_icon);
    g_object_unref (emblem_icon);

    return icon;
}

static gchar *
source_viewer_get_monospace_font_name (void)
{
    GSettings *settings;
    gchar *font_name;

    settings = g_settings_new ("org.gnome.desktop.interface");
    font_name = g_settings_get_string (settings, "monospace-font-name");
    g_object_unref (settings);

    /* Fallback to a reasonable default. */
    if (font_name == NULL)
        font_name = g_strdup ("Monospace 10");

    return font_name;
}

static void
source_viewer_set_text (ESourceViewer *viewer,
                        ESource *source)
{
    GtkTextView *text_view;
    GtkTextBuffer *buffer;
    GtkTextIter start;
    GtkTextIter end;

    text_view = GTK_TEXT_VIEW (viewer->text_view);
    buffer = gtk_text_view_get_buffer (text_view);

    gtk_text_buffer_get_start_iter (buffer, &start);
    gtk_text_buffer_get_end_iter (buffer, &end);
    gtk_text_buffer_delete (buffer, &start, &end);

    if (source != NULL) {
        gchar *string;
        gsize length;

        gtk_text_buffer_get_start_iter (buffer, &start);

        string = e_source_to_string (source, &length);
        gtk_text_buffer_insert (buffer, &start, string, length);
        g_free (string);
    }
}

static void
source_viewer_update_row (ESourceViewer *viewer,
                          ESource *source)
{
    GHashTable *source_index;
    GtkTreeRowReference *reference;
    GtkTreeModel *model;
    GtkTreePath *path;
    GtkTreeIter iter;
    const gchar *display_name;
    const gchar *source_uid;
    gboolean removable;
    gboolean writable;
    gboolean remote_creatable;
    gboolean remote_deletable;

    source_index = viewer->source_index;
    reference = g_hash_table_lookup (source_index, source);

    /* We show all sources, so the reference should be valid. */
    g_return_if_fail (gtk_tree_row_reference_valid (reference));

    model = gtk_tree_row_reference_get_model (reference);
    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_model_get_iter (model, &iter, path);
    gtk_tree_path_free (path);

    source_uid = e_source_get_uid (source);
    display_name = e_source_get_display_name (source);
    removable = e_source_get_removable (source);
    writable = e_source_get_writable (source);
    remote_creatable = e_source_get_remote_creatable (source);
    remote_deletable = e_source_get_remote_deletable (source);

    gtk_tree_store_set (
        GTK_TREE_STORE (model), &iter,
        COLUMN_DISPLAY_NAME, display_name,
        COLUMN_SOURCE_UID, source_uid,
        COLUMN_REMOVABLE, removable,
        COLUMN_WRITABLE, writable,
        COLUMN_REMOTE_CREATABLE, remote_creatable,
        COLUMN_REMOTE_DELETABLE, remote_deletable,
        COLUMN_SOURCE, source,
        -1);
}

static gboolean
source_viewer_traverse (GNode *node,
                        gpointer user_data)
{
    ESourceViewer *viewer;
    ESource *source;
    GHashTable *source_index;
    GtkTreeRowReference *reference = NULL;
    GtkTreeView *tree_view;
    GtkTreeModel *model;
    GtkTreePath *path;
    GtkTreeIter iter;

    /* Skip the root node. */
    if (G_NODE_IS_ROOT (node))
        return FALSE;

    viewer = E_SOURCE_VIEWER (user_data);

    source_index = viewer->source_index;

    tree_view = GTK_TREE_VIEW (viewer->tree_view);
    model = gtk_tree_view_get_model (tree_view);

    if (node->parent != NULL && node->parent->data != NULL)
        reference = g_hash_table_lookup (
            source_index, node->parent->data);

    if (gtk_tree_row_reference_valid (reference)) {
        GtkTreeIter parent;

        path = gtk_tree_row_reference_get_path (reference);
        gtk_tree_model_get_iter (model, &parent, path);
        gtk_tree_path_free (path);

        gtk_tree_store_append (GTK_TREE_STORE (model), &iter, &parent);
    } else
        gtk_tree_store_append (GTK_TREE_STORE (model), &iter, NULL);

    /* Source index takes ownership. */
    source = g_object_ref (node->data);

    path = gtk_tree_model_get_path (model, &iter);
    reference = gtk_tree_row_reference_new (model, path);
    g_hash_table_insert (source_index, source, reference);
    gtk_tree_path_free (path);

    source_viewer_update_row (viewer, source);

    return FALSE;
}

static void
source_viewer_save_expanded (GtkTreeView *tree_view,
                             GtkTreePath *path,
                             GQueue *queue)
{
    GtkTreeModel *model;
    GtkTreeIter iter;
    ESource *source;

    model = gtk_tree_view_get_model (tree_view);
    gtk_tree_model_get_iter (model, &iter, path);
    gtk_tree_model_get (model, &iter, COLUMN_SOURCE, &source, -1);
    g_queue_push_tail (queue, source);
}

static void
source_viewer_build_model (ESourceViewer *viewer)
{
    GQueue queue = G_QUEUE_INIT;
    GHashTable *source_index;
    GtkTreeView *tree_view;
    GtkTreeModel *model;
    GtkTreePath *sel_path;
    ESource *sel_source;
    GNode *root;

    tree_view = GTK_TREE_VIEW (viewer->tree_view);

    source_index = viewer->source_index;
    sel_path = e_source_viewer_dup_selected_path (viewer);
    sel_source = e_source_viewer_ref_selected_source (viewer);

    /* Save expanded sources to restore later. */
    gtk_tree_view_map_expanded_rows (
        tree_view, (GtkTreeViewMappingFunc)
        source_viewer_save_expanded, &queue);

    model = gtk_tree_view_get_model (tree_view);
    gtk_tree_store_clear (GTK_TREE_STORE (model));

    g_hash_table_remove_all (source_index);

    root = e_source_viewer_build_display_tree (viewer);

    g_node_traverse (
        root, G_PRE_ORDER, G_TRAVERSE_ALL, -1,
        (GNodeTraverseFunc) source_viewer_traverse, viewer);

    e_source_registry_free_display_tree (root);

    /* Restore previously expanded sources. */
    while (!g_queue_is_empty (&queue)) {
        GtkTreeRowReference *reference;
        ESource *source;

        source = g_queue_pop_head (&queue);
        reference = g_hash_table_lookup (source_index, source);

        if (gtk_tree_row_reference_valid (reference)) {
            GtkTreePath *path;

            path = gtk_tree_row_reference_get_path (reference);
            gtk_tree_view_expand_to_path (tree_view, path);
            gtk_tree_path_free (path);
        }

        g_object_unref (source);
    }

    /* Restore the selection. */
    if (sel_source != NULL && sel_path != NULL) {
        if (!e_source_viewer_set_selected_source (viewer, sel_source))
            e_source_viewer_set_selected_path (viewer, sel_path);
    }

    if (sel_path != NULL)
        gtk_tree_path_free (sel_path);

    if (sel_source != NULL)
        g_object_unref (sel_source);
}

static void
source_viewer_expand_to_source (ESourceViewer *viewer,
                                ESource *source)
{
    GHashTable *source_index;
    GtkTreeRowReference *reference;
    GtkTreeView *tree_view;
    GtkTreePath *path;

    source_index = viewer->source_index;
    reference = g_hash_table_lookup (source_index, source);

    /* We show all sources, so the reference should be valid. */
    g_return_if_fail (gtk_tree_row_reference_valid (reference));

    /* Expand the tree view to the path containing the ESource. */
    tree_view = GTK_TREE_VIEW (viewer->tree_view);
    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_view_expand_to_path (tree_view, path);
    gtk_tree_path_free (path);
}

static void
source_viewer_source_added_cb (ESourceRegistry *registry,
                               ESource *source,
                               ESourceViewer *viewer)
{
    source_viewer_build_model (viewer);

    source_viewer_expand_to_source (viewer, source);
}

static void
source_viewer_source_changed_cb (ESourceRegistry *registry,
                                 ESource *source,
                                 ESourceViewer *viewer)
{
    ESource *selected;

    source_viewer_update_row (viewer, source);

    selected = e_source_viewer_ref_selected_source (viewer);
    if (selected != NULL) {
        if (e_source_equal (source, selected))
            source_viewer_set_text (viewer, source);
        g_object_unref (selected);
    }
}

static void
source_viewer_source_removed_cb (ESourceRegistry *registry,
                                 ESource *source,
                                 ESourceViewer *viewer)
{
    source_viewer_build_model (viewer);
}

static void
source_viewer_selection_changed_cb (GtkTreeSelection *selection,
                                    ESourceViewer *viewer)
{
    ESource *source;
    const gchar *uid = NULL;
    gboolean removable = FALSE;

    source = e_source_viewer_ref_selected_source (viewer);

    source_viewer_set_text (viewer, source);

    if (source != NULL) {
        uid = e_source_get_uid (source);
        removable = e_source_get_removable (source);
    }

    gtk_label_set_text (GTK_LABEL (viewer->viewing_label), uid);
    gtk_widget_set_visible (viewer->delete_button, removable);

    if (source != NULL)
        g_object_unref (source);
}

static void
source_viewer_delete_done_cb (GObject *source_object,
                              GAsyncResult *result,
                              gpointer user_data)
{
    ESource *source;
    ESourceViewer *viewer;
    GError *error = NULL;

    source = E_SOURCE (source_object);
    viewer = E_SOURCE_VIEWER (user_data);

    e_source_remove_finish (source, result, &error);

    /* Ignore cancellations. */
    if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
        g_clear_error (&error);

    /* FIXME Show an info bar with the error message. */
    } else if (error != NULL) {
        g_warning ("%s: %s", G_STRFUNC, error->message);
        g_clear_error (&error);
    }

    gtk_notebook_set_current_page (
        GTK_NOTEBOOK (viewer->top_panel), PAGE_VIEWING);
    gtk_widget_set_sensitive (viewer->tree_view, TRUE);

    g_object_unref (viewer->delete_operation);
    viewer->delete_operation = NULL;

    g_object_unref (viewer);
}

static void
source_viewer_delete_button_clicked_cb (GtkButton *delete_button,
                                        ESourceViewer *viewer)
{
    ESource *source;
    const gchar *uid;

    g_return_if_fail (viewer->delete_operation == NULL);

    source = e_source_viewer_ref_selected_source (viewer);
    g_return_if_fail (source != NULL);

    uid = e_source_get_uid (source);
    gtk_label_set_text (GTK_LABEL (viewer->deleting_label), uid);

    gtk_notebook_set_current_page (
        GTK_NOTEBOOK (viewer->top_panel), PAGE_DELETING);
    gtk_widget_set_sensitive (viewer->tree_view, FALSE);

    viewer->delete_operation = g_cancellable_new ();

    e_source_remove (
        source,
        viewer->delete_operation,
        source_viewer_delete_done_cb,
        g_object_ref (viewer));

    g_object_unref (source);
}

static void
source_viewer_deleting_cancel_clicked_cb (GtkButton *deleting_cancel,
                                          ESourceViewer *viewer)
{
    g_return_if_fail (viewer->delete_operation != NULL);

    g_cancellable_cancel (viewer->delete_operation);
}

static void
source_viewer_get_property (GObject *object,
                            guint property_id,
                            GValue *value,
                            GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_REGISTRY:
            g_value_set_object (
                value,
                e_source_viewer_get_registry (
                E_SOURCE_VIEWER (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
source_viewer_dispose (GObject *object)
{
    ESourceViewer *viewer = E_SOURCE_VIEWER (object);

    if (viewer->registry != NULL) {
        g_signal_handlers_disconnect_matched (
            viewer->registry,
            G_SIGNAL_MATCH_DATA,
            0, 0, NULL, NULL, object);
        g_object_unref (viewer->registry);
        viewer->registry = NULL;
    }

    if (viewer->tree_store != NULL) {
        g_object_unref (viewer->tree_store);
        viewer->tree_store = NULL;
    }

    g_hash_table_remove_all (viewer->source_index);

    if (viewer->delete_operation != NULL) {
        g_object_unref (viewer->delete_operation);
        viewer->delete_operation = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (e_source_viewer_parent_class)->dispose (object);
}

static void
source_viewer_finalize (GObject *object)
{
    ESourceViewer *viewer = E_SOURCE_VIEWER (object);

    g_hash_table_destroy (viewer->source_index);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (e_source_viewer_parent_class)->finalize (object);
}

static void
source_viewer_constructed (GObject *object)
{
    ESourceViewer *viewer;
    GtkTreeViewColumn *column;
    GtkTreeSelection *selection;
    GtkCellRenderer *renderer;
    GtkWidget *container;
    GtkWidget *paned;
    GtkWidget *widget;
    PangoAttribute *attr;
    PangoAttrList *bold;
    PangoFontDescription *desc;
    GIcon *icon;
    const gchar *title;
    gchar *font_name;
    gint page_num;

    viewer = E_SOURCE_VIEWER (object);

    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (e_source_viewer_parent_class)->constructed (object);

    bold = pango_attr_list_new ();
    attr = pango_attr_weight_new (PANGO_WEIGHT_BOLD);
    pango_attr_list_insert (bold, attr);

    title = _("Evolution Source Viewer");
    gtk_window_set_title (GTK_WINDOW (viewer), title);
    gtk_window_set_default_size (GTK_WINDOW (viewer), 800, 600);

    paned = gtk_paned_new (GTK_ORIENTATION_HORIZONTAL);
    gtk_paned_set_position (GTK_PANED (paned), 400);
    gtk_container_add (GTK_CONTAINER (viewer), paned);
    gtk_widget_show (paned);

    /* Left panel */

    widget = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (
        GTK_SCROLLED_WINDOW (widget),
        GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (
        GTK_SCROLLED_WINDOW (widget), GTK_SHADOW_IN);
    gtk_paned_add1 (GTK_PANED (paned), widget);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_tree_view_new_with_model (
        GTK_TREE_MODEL (viewer->tree_store));
    gtk_container_add (GTK_CONTAINER (container), widget);
    viewer->tree_view = widget;  /* do not reference */
    gtk_widget_show (widget);

    column = gtk_tree_view_column_new ();
    /* Translators: The name that is displayed in the user interface */
    gtk_tree_view_column_set_title (column, _("Display Name"));
    gtk_tree_view_append_column (GTK_TREE_VIEW (widget), column);

    renderer = gtk_cell_renderer_text_new ();
    gtk_tree_view_column_pack_start (column, renderer, TRUE);
    gtk_tree_view_column_add_attribute (
        column, renderer, "text", COLUMN_DISPLAY_NAME);

    column = gtk_tree_view_column_new ();
    gtk_tree_view_column_set_title (column, _("Flags"));
    gtk_tree_view_append_column (GTK_TREE_VIEW (widget), column);

    renderer = gtk_cell_renderer_pixbuf_new ();
    g_object_set (
        renderer,
        "icon-name", "media-record",
        "stock-size", GTK_ICON_SIZE_MENU,
        NULL);
    gtk_tree_view_column_pack_start (column, renderer, FALSE);
    gtk_tree_view_column_add_attribute (
        column, renderer, "visible", COLUMN_WRITABLE);

    renderer = gtk_cell_renderer_pixbuf_new ();
    g_object_set (
        renderer,
        "icon-name", "list-remove",
        "stock-size", GTK_ICON_SIZE_MENU,
        NULL);
    gtk_tree_view_column_pack_start (column, renderer, FALSE);
    gtk_tree_view_column_add_attribute (
        column, renderer, "visible", COLUMN_REMOVABLE);

    icon = source_view_new_remote_creatable_icon ();
    renderer = gtk_cell_renderer_pixbuf_new ();
    g_object_set (
        renderer,
        "gicon", icon,
        "stock-size", GTK_ICON_SIZE_MENU,
        NULL);
    gtk_tree_view_column_pack_start (column, renderer, FALSE);
    gtk_tree_view_column_add_attribute (
        column, renderer, "visible", COLUMN_REMOTE_CREATABLE);
    g_object_unref (icon);

    icon = source_view_new_remote_deletable_icon ();
    renderer = gtk_cell_renderer_pixbuf_new ();
    g_object_set (
        renderer,
        "gicon", icon,
        "stock-size", GTK_ICON_SIZE_MENU,
        NULL);
    gtk_tree_view_column_pack_start (column, renderer, FALSE);
    gtk_tree_view_column_add_attribute (
        column, renderer, "visible", COLUMN_REMOTE_DELETABLE);
    g_object_unref (icon);

    /* Append an empty pixbuf renderer to fill leftover space. */
    renderer = gtk_cell_renderer_pixbuf_new ();
    gtk_tree_view_column_pack_start (column, renderer, TRUE);

    column = gtk_tree_view_column_new ();
    gtk_tree_view_column_set_title (column, _("Identity"));
    gtk_tree_view_append_column (GTK_TREE_VIEW (widget), column);

    renderer = gtk_cell_renderer_text_new ();
    gtk_tree_view_column_pack_start (column, renderer, FALSE);
    gtk_tree_view_column_add_attribute (
        column, renderer, "text", COLUMN_SOURCE_UID);

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (widget));

    /* Right panel */

    widget = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
    gtk_paned_add2 (GTK_PANED (paned), widget);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_notebook_new ();
    gtk_widget_set_margin_top (widget, 3);
    gtk_widget_set_margin_right (widget, 3);
    gtk_widget_set_margin_bottom (widget, 3);
    /* leave left margin at zero */
    gtk_notebook_set_show_tabs (GTK_NOTEBOOK (widget), FALSE);
    gtk_notebook_set_show_border (GTK_NOTEBOOK (widget), FALSE);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    viewer->top_panel = widget;  /* do not reference */
    gtk_widget_show (widget);

    widget = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (
        GTK_SCROLLED_WINDOW (widget),
        GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (
        GTK_SCROLLED_WINDOW (widget), GTK_SHADOW_IN);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_text_view_new ();
    gtk_text_view_set_editable (GTK_TEXT_VIEW (widget), FALSE);
    gtk_container_add (GTK_CONTAINER (container), widget);
    viewer->text_view = widget;  /* do not reference */
    gtk_widget_show (widget);

    font_name = source_viewer_get_monospace_font_name ();
    desc = pango_font_description_from_string (font_name);
    gtk_widget_override_font (widget, desc);
    pango_font_description_free (desc);
    g_free (font_name);

    /* Top panel: Viewing */

    container = viewer->top_panel;

    widget = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
    page_num = gtk_notebook_append_page (
        GTK_NOTEBOOK (container), widget, NULL);
    g_warn_if_fail (page_num == PAGE_VIEWING);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_label_new ("Identity:");
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    widget = gtk_label_new (NULL);
    gtk_label_set_attributes (GTK_LABEL (widget), bold);
    gtk_label_set_ellipsize (GTK_LABEL (widget), PANGO_ELLIPSIZE_END);
    gtk_label_set_selectable (GTK_LABEL (widget), TRUE);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    viewer->viewing_label = widget;  /* do not reference */
    gtk_widget_show (widget);

    widget = e_dialog_button_new_with_icon ("edit-delete", _("_Delete"));
    gtk_box_pack_end (GTK_BOX (container), widget, FALSE, FALSE, 0);
    viewer->delete_button = widget;  /* do not reference */
    gtk_widget_hide (widget);

    /* Top panel: Deleting */

    container = viewer->top_panel;

    widget = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
    page_num = gtk_notebook_append_page (
        GTK_NOTEBOOK (container), widget, NULL);
    g_warn_if_fail (page_num == PAGE_DELETING);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_label_new ("Deleting");
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    widget = gtk_label_new (NULL);
    gtk_label_set_attributes (GTK_LABEL (widget), bold);
    gtk_label_set_ellipsize (GTK_LABEL (widget), PANGO_ELLIPSIZE_END);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    viewer->deleting_label = widget;  /* do not reference */
    gtk_widget_show (widget);

    widget = e_dialog_button_new_with_icon ("process-stop", _("_Cancel"));
    gtk_box_pack_end (GTK_BOX (container), widget, FALSE, FALSE, 0);
    viewer->deleting_cancel = widget;  /* do not reference */
    gtk_widget_show (widget);

    pango_attr_list_unref (bold);

    g_signal_connect (
        selection, "changed",
        G_CALLBACK (source_viewer_selection_changed_cb), viewer);

    g_signal_connect (
        viewer->delete_button, "clicked",
        G_CALLBACK (source_viewer_delete_button_clicked_cb), viewer);

    g_signal_connect (
        viewer->deleting_cancel, "clicked",
        G_CALLBACK (source_viewer_deleting_cancel_clicked_cb), viewer);
}

static gboolean
source_viewer_initable_init (GInitable *initable,
                             GCancellable *cancellable,
                             GError **error)
{
    ESourceViewer *viewer;
    ESourceRegistry *registry;

    viewer = E_SOURCE_VIEWER (initable);

    registry = e_source_registry_new_sync (cancellable, error);

    if (registry == NULL)
        return FALSE;

    viewer->registry = registry;  /* takes ownership */

    g_signal_connect (
        registry, "source-added",
        G_CALLBACK (source_viewer_source_added_cb), viewer);

    g_signal_connect (
        registry, "source-changed",
        G_CALLBACK (source_viewer_source_changed_cb), viewer);

    g_signal_connect (
        registry, "source-removed",
        G_CALLBACK (source_viewer_source_removed_cb), viewer);

    source_viewer_build_model (viewer);

    gtk_tree_view_expand_all (GTK_TREE_VIEW (viewer->tree_view));

    return TRUE;
}

static void
e_source_viewer_class_init (ESourceViewerClass *class)
{
    GObjectClass *object_class;

    object_class = G_OBJECT_CLASS (class);
    object_class->get_property = source_viewer_get_property;
    object_class->dispose = source_viewer_dispose;
    object_class->finalize = source_viewer_finalize;
    object_class->constructed = source_viewer_constructed;

    g_object_class_install_property (
        object_class,
        PROP_REGISTRY,
        g_param_spec_object (
            "registry",
            "Registry",
            "Data source registry",
            E_TYPE_SOURCE_REGISTRY,
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));
}

static void
e_source_viewer_initable_init (GInitableIface *iface)
{
    iface->init = source_viewer_initable_init;
}

static void
e_source_viewer_init (ESourceViewer *viewer)
{
    viewer->tree_store = gtk_tree_store_new (
        NUM_COLUMNS,
        G_TYPE_STRING,      /* COLUMN_DISPLAY_NAME */
        G_TYPE_STRING,      /* COLUMN_SOURCE_UID */
        G_TYPE_BOOLEAN,     /* COLUMN_REMOVABLE */
        G_TYPE_BOOLEAN,     /* COLUMN_WRITABLE */
        G_TYPE_BOOLEAN,     /* COLUMN_REMOTE_CREATABLE */
        G_TYPE_BOOLEAN,     /* COLUMN_REMOTE_DELETABLE */
        E_TYPE_SOURCE);     /* COLUMN_SOURCE */

    viewer->source_index = g_hash_table_new_full (
        (GHashFunc) e_source_hash,
        (GEqualFunc) e_source_equal,
        (GDestroyNotify) g_object_unref,
        (GDestroyNotify) gtk_tree_row_reference_free);
}

GtkWidget *
e_source_viewer_new (GCancellable *cancellable,
                     GError **error)
{
    return g_initable_new (
        E_TYPE_SOURCE_VIEWER,
        cancellable, error, NULL);
}

ESourceRegistry *
e_source_viewer_get_registry (ESourceViewer *viewer)
{
    g_return_val_if_fail (E_IS_SOURCE_VIEWER (viewer), NULL);

    return viewer->registry;
}

GtkTreePath *
e_source_viewer_dup_selected_path (ESourceViewer *viewer)
{
    GtkTreeSelection *selection;
    GtkTreeView *tree_view;
    GtkTreeModel *model;
    GtkTreeIter iter;

    g_return_val_if_fail (E_IS_SOURCE_VIEWER (viewer), NULL);

    tree_view = GTK_TREE_VIEW (viewer->tree_view);
    selection = gtk_tree_view_get_selection (tree_view);

    if (!gtk_tree_selection_get_selected (selection, &model, &iter))
        return NULL;

    return gtk_tree_model_get_path (model, &iter);
}

gboolean
e_source_viewer_set_selected_path (ESourceViewer *viewer,
                                   GtkTreePath *path)
{
    GtkTreeSelection *selection;
    GtkTreeView *tree_view;
    GtkTreeModel *model;
    GtkTreeIter iter;

    g_return_val_if_fail (E_IS_SOURCE_VIEWER (viewer), FALSE);
    g_return_val_if_fail (path != NULL, FALSE);

    tree_view = GTK_TREE_VIEW (viewer->tree_view);
    selection = gtk_tree_view_get_selection (tree_view);

    /* Check that the path is valid. */
    model = gtk_tree_view_get_model (tree_view);
    if (!gtk_tree_model_get_iter (model, &iter, path))
        return FALSE;

    gtk_tree_selection_unselect_all (selection);

    gtk_tree_view_expand_to_path (tree_view, path);
    gtk_tree_selection_select_path (selection, path);

    return TRUE;
}

ESource *
e_source_viewer_ref_selected_source (ESourceViewer *viewer)
{
    ESource *source;
    GtkTreeSelection *selection;
    GtkTreeView *tree_view;
    GtkTreeModel *model;
    GtkTreeIter iter;

    g_return_val_if_fail (E_IS_SOURCE_VIEWER (viewer), NULL);

    tree_view = GTK_TREE_VIEW (viewer->tree_view);
    selection = gtk_tree_view_get_selection (tree_view);

    if (!gtk_tree_selection_get_selected (selection, &model, &iter))
        return NULL;

    gtk_tree_model_get (model, &iter, COLUMN_SOURCE, &source, -1);

    return source;
}

gboolean
e_source_viewer_set_selected_source (ESourceViewer *viewer,
                                     ESource *source)
{
    GHashTable *source_index;
    GtkTreeRowReference *reference;
    GtkTreePath *path;
    gboolean success;

    g_return_val_if_fail (E_IS_SOURCE_VIEWER (viewer), FALSE);
    g_return_val_if_fail (E_IS_SOURCE (source), FALSE);

    source_index = viewer->source_index;
    reference = g_hash_table_lookup (source_index, source);

    if (!gtk_tree_row_reference_valid (reference))
        return FALSE;

    path = gtk_tree_row_reference_get_path (reference);
    success = e_source_viewer_set_selected_path (viewer, path);
    gtk_tree_path_free (path);

    return success;
}

/* Helper for e_source_viewer_build_display_tree() */
static gint
source_viewer_compare_nodes (GNode *node_a,
                             GNode *node_b)
{
    ESource *source_a = E_SOURCE (node_a->data);
    ESource *source_b = E_SOURCE (node_b->data);

    return e_source_compare_by_display_name (source_a, source_b);
}

/* Helper for e_source_viewer_build_display_tree() */
static gboolean
source_viewer_sort_nodes (GNode *node,
                          gpointer unused)
{
    GQueue queue = G_QUEUE_INIT;
    GNode *child_node;

    /* Unlink all the child nodes and place them in a queue. */
    while ((child_node = g_node_first_child (node)) != NULL) {
        g_node_unlink (child_node);
        g_queue_push_tail (&queue, child_node);
    }

    /* Sort the queue by source name. */
    g_queue_sort (
        &queue, (GCompareDataFunc)
        source_viewer_compare_nodes, NULL);

    /* Pop nodes off the head of the queue and put them back
     * under the parent node (preserving the sorted order). */
    while ((child_node = g_queue_pop_head (&queue)) != NULL)
        g_node_append (node, child_node);

    return FALSE;
}

GNode *
e_source_viewer_build_display_tree (ESourceViewer *viewer)
{
    GNode *root;
    GHashTable *index;
    GList *list, *link;
    GHashTableIter iter;
    gpointer value;

    /* This is just like e_source_registry_build_display_tree()
     * except it includes all data sources, even disabled ones.
     * Free the tree with e_source_registry_free_display_tree(). */

    g_return_val_if_fail (E_IS_SOURCE_VIEWER (viewer), NULL);

    root = g_node_new (NULL);
    index = g_hash_table_new (g_str_hash, g_str_equal);

    /* Add a GNode for each ESource to the index.
     * The GNodes take ownership of the ESource references. */
    list = e_source_registry_list_sources (viewer->registry, NULL);
    for (link = list; link != NULL; link = g_list_next (link)) {
        ESource *source = E_SOURCE (link->data);
        gpointer key = (gpointer) e_source_get_uid (source);
        g_hash_table_insert (index, key, g_node_new (source));
    }
    g_list_free (list);

    /* Traverse the index and link the nodes together. */
    g_hash_table_iter_init (&iter, index);
    while (g_hash_table_iter_next (&iter, NULL, &value)) {
        ESource *source;
        GNode *source_node;
        GNode *parent_node;
        const gchar *parent_uid;

        source_node = (GNode *) value;
        source = E_SOURCE (source_node->data);
        parent_uid = e_source_get_parent (source);

        if (parent_uid == NULL || *parent_uid == '\0') {
            parent_node = root;
        } else {
            parent_node = g_hash_table_lookup (index, parent_uid);
        }

        /* This could be NULL if the registry service was
         * shutdown or reloaded.  All sources will vanish. */
        if (parent_node != NULL)
            g_node_append (parent_node, source_node);
    }

    /* Sort nodes by display name in post order. */
    g_node_traverse (
        root, G_POST_ORDER, G_TRAVERSE_ALL,
        -1, source_viewer_sort_nodes, NULL);

    g_hash_table_destroy (index);

    return root;
}

gint
main (gint argc,
      gchar **argv)
{
    GtkWidget *viewer;
    GError *error = NULL;

    bindtextdomain (GETTEXT_PACKAGE, EVOLUTION_LOCALEDIR);
    bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
    textdomain (GETTEXT_PACKAGE);

    gtk_init (&argc, &argv);

    viewer = e_source_viewer_new (NULL, &error);

    if (error != NULL) {
        g_warn_if_fail (viewer == NULL);
        g_error ("%s", error->message);
        g_assert_not_reached ();
    }

    g_signal_connect (
        viewer, "delete-event",
        G_CALLBACK (gtk_main_quit), NULL);

    gtk_widget_show (viewer);

    gtk_main ();

    return 0;
}