path: root/widgets/misc/e-signature-tree-view.c

/*
 * e-signature-tree-view.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; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-signature-tree-view.h"

enum {
    COLUMN_STRING,
    COLUMN_SIGNATURE
};

enum {
    PROP_0,
    PROP_SELECTED,
    PROP_SIGNATURE_LIST
};

enum {
    REFRESHED,
    LAST_SIGNAL
};

struct _ESignatureTreeViewPrivate {
    ESignatureList *signature_list;
    GHashTable *index;
};

static guint signals[LAST_SIGNAL];

G_DEFINE_TYPE (
    ESignatureTreeView,
    e_signature_tree_view,
    GTK_TYPE_TREE_VIEW)

static void
signature_tree_view_refresh_cb (ESignatureList *signature_list,
                                ESignature *unused,
                                ESignatureTreeView *tree_view)
{
    GtkListStore *store;
    GtkTreeModel *model;
    GtkTreeIter tree_iter;
    EIterator *signature_iter;
    ESignature *signature;
    GHashTable *index;
    GList *list = NULL;
    GList *iter;

    store = gtk_list_store_new (2, G_TYPE_STRING, E_TYPE_SIGNATURE);
    model = GTK_TREE_MODEL (store);
    index = tree_view->priv->index;

    g_hash_table_remove_all (index);

    if (signature_list == NULL)
        goto skip;

    /* Build a list of ESignatures to display. */
    signature_iter = e_list_get_iterator (E_LIST (signature_list));
    while (e_iterator_is_valid (signature_iter)) {

        /* XXX EIterator misuses const. */
        signature = (ESignature *) e_iterator_get (signature_iter);
        list = g_list_prepend (list, signature);
        e_iterator_next (signature_iter);
    }
    g_object_unref (signature_iter);

    list = g_list_reverse (list);

    /* Populate the list store and index. */
    for (iter = list; iter != NULL; iter = iter->next) {
        GtkTreeRowReference *reference;
        GtkTreePath *path;
        const gchar *name;

        signature = iter->data;

        /* Skip autogenerated signatures. */
        if (e_signature_get_autogenerated (signature))
            continue;

        name = e_signature_get_name (signature);

        gtk_list_store_append (store, &tree_iter);
        gtk_list_store_set (
            store, &tree_iter,
            COLUMN_STRING, name,
            COLUMN_SIGNATURE, signature, -1);

        path = gtk_tree_model_get_path (model, &tree_iter);
        reference = gtk_tree_row_reference_new (model, path);
        g_hash_table_insert (index, signature, reference);
        gtk_tree_path_free (path);
    }

skip:
    /* Restore the previously selected signature. */
    signature = e_signature_tree_view_get_selected (tree_view);
    if (signature != NULL)
        g_object_ref (signature);
    gtk_tree_view_set_model (GTK_TREE_VIEW (tree_view), model);
    e_signature_tree_view_set_selected (tree_view, signature);
    if (signature != NULL)
        g_object_unref (signature);

    g_signal_emit (tree_view, signals[REFRESHED], 0);
}

static void
signature_tree_view_selection_changed_cb (ESignatureTreeView *tree_view)
{
    g_object_notify (G_OBJECT (tree_view), "selected");
}

static GObject *
signature_tree_view_constructor (GType type,
                                 guint n_construct_properties,
                                 GObjectConstructParam *construct_properties)
{
    GObject *object;
    GtkTreeView *tree_view;
    GtkTreeViewColumn *column;
    GtkCellRenderer *renderer;

    /* Chain up to parent's constructor() method. */
    object = G_OBJECT_CLASS (
        e_signature_tree_view_parent_class)->constructor (
        type, n_construct_properties, construct_properties);

    tree_view = GTK_TREE_VIEW (object);
    gtk_tree_view_set_headers_visible (tree_view, FALSE);

    column = gtk_tree_view_column_new ();
    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_STRING);
    gtk_tree_view_append_column (tree_view, column);

    return object;
}

static void
signature_tree_view_set_property (GObject *object,
                                  guint property_id,
                                  const GValue *value,
                                  GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_SELECTED:
            e_signature_tree_view_set_selected (
                E_SIGNATURE_TREE_VIEW (object),
                g_value_get_object (value));
            return;

        case PROP_SIGNATURE_LIST:
            e_signature_tree_view_set_signature_list (
                E_SIGNATURE_TREE_VIEW (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
signature_tree_view_get_property (GObject *object,
                                  guint property_id,
                                  GValue *value,
                                  GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_SELECTED:
            g_value_set_object (
                value,
                e_signature_tree_view_get_selected (
                E_SIGNATURE_TREE_VIEW (object)));
            return;

        case PROP_SIGNATURE_LIST:
            g_value_set_object (
                value,
                e_signature_tree_view_get_signature_list (
                E_SIGNATURE_TREE_VIEW (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
signature_tree_view_dispose (GObject *object)
{
    ESignatureTreeViewPrivate *priv;

    priv = E_SIGNATURE_TREE_VIEW (object)->priv;

    if (priv->signature_list != NULL) {
        g_signal_handlers_disconnect_by_func (
            priv->signature_list,
            signature_tree_view_refresh_cb, object);
        g_object_unref (priv->signature_list);
        priv->signature_list = NULL;
    }

    g_hash_table_remove_all (priv->index);

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

static void
signature_tree_view_finalize (GObject *object)
{
    ESignatureTreeViewPrivate *priv;

    priv = E_SIGNATURE_TREE_VIEW (object)->priv;

    g_hash_table_destroy (priv->index);

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

static void
e_signature_tree_view_class_init (ESignatureTreeViewClass *class)
{
    GObjectClass *object_class;

    g_type_class_add_private (class, sizeof (ESignatureTreeViewPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->constructor = signature_tree_view_constructor;
    object_class->set_property = signature_tree_view_set_property;
    object_class->get_property = signature_tree_view_get_property;
    object_class->dispose = signature_tree_view_dispose;
    object_class->finalize = signature_tree_view_finalize;

    g_object_class_install_property (
        object_class,
        PROP_SELECTED,
        g_param_spec_object (
            "selected",
            "Selected Signature",
            NULL,
            E_TYPE_SIGNATURE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_SIGNATURE_LIST,
        g_param_spec_object (
            "signature-list",
            "Signature List",
            NULL,
            E_TYPE_SIGNATURE_LIST,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    signals[REFRESHED] = g_signal_new (
        "refreshed",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        0, NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);
}

static void
e_signature_tree_view_init (ESignatureTreeView *tree_view)
{
    GHashTable *index;
    GtkTreeSelection *selection;

    /* Reverse-lookup index */
    index = g_hash_table_new_full (
        g_direct_hash, g_direct_equal,
        (GDestroyNotify) g_object_unref,
        (GDestroyNotify) gtk_tree_row_reference_free);

    tree_view->priv = G_TYPE_INSTANCE_GET_PRIVATE (
        tree_view, E_TYPE_SIGNATURE_TREE_VIEW,
        ESignatureTreeViewPrivate);
    tree_view->priv->index = index;

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (tree_view));

    g_signal_connect_swapped (
        selection, "changed",
        G_CALLBACK (signature_tree_view_selection_changed_cb),
        tree_view);
}

GtkWidget *
e_signature_tree_view_new (void)
{
    return g_object_new (E_TYPE_SIGNATURE_TREE_VIEW, NULL);
}

ESignatureList *
e_signature_tree_view_get_signature_list (ESignatureTreeView *tree_view)
{
    g_return_val_if_fail (E_IS_SIGNATURE_TREE_VIEW (tree_view), NULL);

    return tree_view->priv->signature_list;
}

void
e_signature_tree_view_set_signature_list (ESignatureTreeView *tree_view,
                                          ESignatureList *signature_list)
{
    ESignatureTreeViewPrivate *priv;

    g_return_if_fail (E_IS_SIGNATURE_TREE_VIEW (tree_view));

    if (signature_list != NULL)
        g_return_if_fail (E_IS_SIGNATURE_LIST (signature_list));

    priv = tree_view->priv;

    if (priv->signature_list != NULL) {
        g_signal_handlers_disconnect_by_func (
            priv->signature_list,
            signature_tree_view_refresh_cb, tree_view);
        g_object_unref (priv->signature_list);
        priv->signature_list = NULL;
    }

    if (signature_list != NULL) {
        priv->signature_list = g_object_ref (signature_list);

        /* Listen for changes to the signature list. */
        g_signal_connect (
            priv->signature_list, "signature-added",
            G_CALLBACK (signature_tree_view_refresh_cb),
            tree_view);
        g_signal_connect (
            priv->signature_list, "signature-changed",
            G_CALLBACK (signature_tree_view_refresh_cb),
            tree_view);
        g_signal_connect (
            priv->signature_list, "signature-removed",
            G_CALLBACK (signature_tree_view_refresh_cb),
            tree_view);
    }

    signature_tree_view_refresh_cb (signature_list, NULL, tree_view);

    g_object_notify (G_OBJECT (tree_view), "signature-list");
}

ESignature *
e_signature_tree_view_get_selected (ESignatureTreeView *tree_view)
{
    ESignature *signature;
    GtkTreeSelection *selection;
    GtkTreeModel *model;
    GtkTreeIter iter;

    g_return_val_if_fail (E_IS_SIGNATURE_TREE_VIEW (tree_view), NULL);

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (tree_view));
    if (!gtk_tree_selection_get_selected (selection, &model, &iter))
        return NULL;

    gtk_tree_model_get (model, &iter, COLUMN_SIGNATURE, &signature, -1);

    return signature;
}

gboolean
e_signature_tree_view_set_selected (ESignatureTreeView *tree_view,
                                    ESignature *signature)
{
    GtkTreeRowReference *reference;
    GtkTreeSelection *selection;
    GtkTreePath *path;

    g_return_val_if_fail (E_IS_SIGNATURE_TREE_VIEW (tree_view), FALSE);

    if (signature != NULL)
        g_return_val_if_fail (E_IS_SIGNATURE (signature), FALSE);

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (tree_view));

    /* NULL means clear the selection. */
    if (signature == NULL) {
        gtk_tree_selection_unselect_all (selection);
        return TRUE;
    }

    /* Lookup the tree row reference for the signature. */
    reference = g_hash_table_lookup (tree_view->priv->index, signature);
    if (reference == NULL)
        return FALSE;

    /* Select the referenced path. */
    path = gtk_tree_row_reference_get_path (reference);
    gtk_tree_selection_select_path (selection, path);
    gtk_tree_path_free (path);

    g_object_notify (G_OBJECT (tree_view), "selected");

    return TRUE;
}