path: root/widgets/misc/e-action-combo-box.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-action-combo-box.c
 *
 * Copyright (C) 2008 Novell, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 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, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "e-action-combo-box.h"

#include <glib/gi18n.h>

enum {
    COLUMN_ACTION,
    COLUMN_SORT
};

enum {
    PROP_0,
    PROP_ACTION
};

struct _EActionComboBoxPrivate {
    GtkRadioAction *action;
    GtkActionGroup *action_group;
    GHashTable *index;
    guint changed_handler_id;       /* action::changed */
    guint group_sensitive_handler_id;   /* action-group::sensitive */
    guint group_visible_handler_id;     /* action-group::visible */
    gboolean group_has_icons : 1;
};

G_DEFINE_TYPE (
    EActionComboBox,
    e_action_combo_box,
    GTK_TYPE_COMBO_BOX)

static void
action_combo_box_action_changed_cb (GtkRadioAction *action,
                                    GtkRadioAction *current,
                                    EActionComboBox *combo_box)
{
    GtkTreeRowReference *reference;
    GtkTreeModel *model;
    GtkTreePath *path;
    GtkTreeIter iter;
    gboolean valid;

    reference = g_hash_table_lookup (
        combo_box->priv->index, GINT_TO_POINTER (
        gtk_radio_action_get_current_value (current)));
    g_return_if_fail (reference != NULL);

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

    gtk_combo_box_set_active_iter (GTK_COMBO_BOX (combo_box), &iter);
}

static void
action_combo_box_action_group_notify_cb (GtkActionGroup *action_group,
                                         GParamSpec *pspec,
                                         EActionComboBox *combo_box)
{
    g_object_set (
        combo_box, "sensitive",
        gtk_action_group_get_sensitive (action_group), "visible",
        gtk_action_group_get_visible (action_group), NULL);
}

static void
action_combo_box_render_pixbuf (GtkCellLayout *layout,
                                GtkCellRenderer *renderer,
                                GtkTreeModel *model,
                                GtkTreeIter *iter,
                                EActionComboBox *combo_box)
{
    GtkRadioAction *action;
    gchar *icon_name;
    gchar *stock_id;
    gboolean sensitive;
    gboolean visible;
    gint width;

    gtk_tree_model_get (model, iter, COLUMN_ACTION, &action, -1);

    /* Do any of the actions have an icon? */
    if (!combo_box->priv->group_has_icons)
        return;

    /* A NULL action means the row is a separator. */
    if (action == NULL)
        return;

    g_object_get (
        G_OBJECT (action),
        "icon-name", &icon_name,
        "sensitive", &sensitive,
        "stock-id", &stock_id,
        "visible", &visible,
        NULL);

    /* Keep the pixbuf renderer a fixed size for proper alignment. */
    gtk_icon_size_lookup (GTK_ICON_SIZE_MENU, &width, NULL);

    /* We can't set both "icon-name" and "stock-id" because setting
     * one unsets the other.  So pick the one that has a non-NULL
     * value.  If both are non-NULL, "stock-id" wins. */

    if (stock_id != NULL)
        g_object_set (
            G_OBJECT (renderer),
            "sensitive", sensitive,
            "icon-name", NULL,
            "stock-id", stock_id,
            "stock-size", GTK_ICON_SIZE_MENU,
            "visible", visible,
            "width", width,
            NULL);
    else
        g_object_set (
            G_OBJECT (renderer),
            "sensitive", sensitive,
            "icon-name", icon_name,
            "stock-id", NULL,
            "stock-size", GTK_ICON_SIZE_MENU,
            "visible", visible,
            "width", width,
            NULL);

    g_free (icon_name);
    g_free (stock_id);
}

static void
action_combo_box_render_text (GtkCellLayout *layout,
                              GtkCellRenderer *renderer,
                              GtkTreeModel *model,
                              GtkTreeIter *iter,
                              EActionComboBox *combo_box)
{
    GtkRadioAction *action;
    gchar **strv;
    gchar *label;
    gboolean sensitive;
    gboolean visible;
    gint xpad;

    gtk_tree_model_get (model, iter, COLUMN_ACTION, &action, -1);

    /* A NULL action means the row is a separator. */
    if (action == NULL)
        return;

    g_object_get (
        G_OBJECT (action),
        "label", &label,
        "sensitive", &sensitive,
        "visible", &visible,
        NULL);

    /* Strip out underscores. */
    strv = g_strsplit (label, "_", -1);
    g_free (label);
    label = g_strjoinv (NULL, strv);
    g_strfreev (strv);

    xpad = combo_box->priv->group_has_icons ? 3 : 0;

    g_object_set (
        G_OBJECT (renderer),
        "sensitive", sensitive,
        "text", label,
        "visible", visible,
        "xpad", xpad,
        NULL);

    g_free (label);
}

static gboolean
action_combo_box_is_row_separator (GtkTreeModel *model,
                                   GtkTreeIter *iter)
{
    GtkAction *action;
    gboolean separator;

    /* NULL actions are rendered as separators. */
    gtk_tree_model_get (model, iter, COLUMN_ACTION, &action, -1);
    separator = (action == NULL);
    if (action != NULL)
        g_object_unref (action);

    return separator;
}

static void
action_combo_box_update_model (EActionComboBox *combo_box)
{
    GtkListStore *list_store;
    GSList *list;

    g_hash_table_remove_all (combo_box->priv->index);

    if (combo_box->priv->action == NULL) {
        gtk_combo_box_set_model (GTK_COMBO_BOX (combo_box), NULL);
        return;
    }

    /* We store values in the sort column as floats so that we can
     * insert separators in between consecutive integer values and
     * still maintain the proper ordering. */
    list_store = gtk_list_store_new (
        2, GTK_TYPE_RADIO_ACTION, G_TYPE_FLOAT);

    list = gtk_radio_action_get_group (combo_box->priv->action);
    combo_box->priv->group_has_icons = FALSE;

    while (list != NULL) {
        GtkTreeRowReference *reference;
        GtkRadioAction *action = list->data;
        GtkTreePath *path;
        GtkTreeIter iter;
        gchar *icon_name;
        gchar *stock_id;
        gint value;

        g_object_get (
            action, "icon-name", &icon_name,
            "stock-id", &stock_id, NULL);
        combo_box->priv->group_has_icons |=
            (icon_name != NULL || stock_id != NULL);
        g_free (icon_name);
        g_free (stock_id);

        gtk_list_store_append (list_store, &iter);
        g_object_get (G_OBJECT (action), "value", &value, NULL);
        gtk_list_store_set (
            list_store, &iter, COLUMN_ACTION,
            list->data, COLUMN_SORT, (gfloat) value, -1);

        path = gtk_tree_model_get_path (
            GTK_TREE_MODEL (list_store), &iter);
        reference = gtk_tree_row_reference_new (
            GTK_TREE_MODEL (list_store), path);
        g_hash_table_insert (
            combo_box->priv->index,
            GINT_TO_POINTER (value), reference);
        gtk_tree_path_free (path);

        list = g_slist_next (list);
    }

    gtk_tree_sortable_set_sort_column_id (
        GTK_TREE_SORTABLE (list_store),
        COLUMN_SORT, GTK_SORT_ASCENDING);
    gtk_combo_box_set_model (
        GTK_COMBO_BOX (combo_box), GTK_TREE_MODEL (list_store));

    action_combo_box_action_changed_cb (
        combo_box->priv->action,
        combo_box->priv->action,
        combo_box);
}

static void
action_combo_box_set_property (GObject *object,
                               guint property_id,
                               const GValue *value,
                               GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACTION:
            e_action_combo_box_set_action (
                E_ACTION_COMBO_BOX (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
action_combo_box_get_property (GObject *object,
                               guint property_id,
                               GValue *value,
                               GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACTION:
            g_value_set_object (
                value, e_action_combo_box_get_action (
                E_ACTION_COMBO_BOX (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
action_combo_box_dispose (GObject *object)
{
    EActionComboBoxPrivate *priv = E_ACTION_COMBO_BOX (object)->priv;

    if (priv->action != NULL) {
        g_object_unref (priv->action);
        priv->action = NULL;
    }

    if (priv->action_group != NULL) {
        g_object_unref (priv->action_group);
        priv->action_group = NULL;
    }

    g_hash_table_remove_all (priv->index);

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

static void
action_combo_box_finalize (GObject *object)
{
    EActionComboBoxPrivate *priv = E_ACTION_COMBO_BOX (object)->priv;

    g_hash_table_destroy (priv->index);

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

static void
action_combo_box_constructed (GObject *object)
{
    GtkComboBox *combo_box;
    GtkCellRenderer *renderer;

    combo_box = GTK_COMBO_BOX (object);

    /* This needs to happen after constructor properties are set
     * so that GtkCellLayout.get_area() returns something valid. */

    renderer = gtk_cell_renderer_pixbuf_new ();
    gtk_cell_layout_pack_start (
        GTK_CELL_LAYOUT (combo_box), renderer, FALSE);
    gtk_cell_layout_set_cell_data_func (
        GTK_CELL_LAYOUT (combo_box), renderer,
        (GtkCellLayoutDataFunc) action_combo_box_render_pixbuf,
        combo_box, NULL);

    renderer = gtk_cell_renderer_text_new ();
    gtk_cell_layout_pack_start (
        GTK_CELL_LAYOUT (combo_box), renderer, TRUE);
    gtk_cell_layout_set_cell_data_func (
        GTK_CELL_LAYOUT (combo_box), renderer,
        (GtkCellLayoutDataFunc) action_combo_box_render_text,
        combo_box, NULL);

    gtk_combo_box_set_row_separator_func (
        combo_box, (GtkTreeViewRowSeparatorFunc)
        action_combo_box_is_row_separator, NULL, NULL);
}

static void
action_combo_box_changed (GtkComboBox *combo_box)
{
    GtkRadioAction *action;
    GtkTreeModel *model;
    GtkTreeIter iter;
    gint value;

    /* This method is virtual, so no need to chain up. */

    if (!gtk_combo_box_get_active_iter (combo_box, &iter))
        return;

    model = gtk_combo_box_get_model (combo_box);
    gtk_tree_model_get (model, &iter, COLUMN_ACTION, &action, -1);
    g_object_get (G_OBJECT (action), "value", &value, NULL);
    gtk_radio_action_set_current_value (action, value);
}

static void
e_action_combo_box_class_init (EActionComboBoxClass *class)
{
    GObjectClass *object_class;
    GtkComboBoxClass *combo_box_class;

    g_type_class_add_private (class, sizeof (EActionComboBoxPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = action_combo_box_set_property;
    object_class->get_property = action_combo_box_get_property;
    object_class->dispose = action_combo_box_dispose;
    object_class->finalize = action_combo_box_finalize;
    object_class->constructed = action_combo_box_constructed;

    combo_box_class = GTK_COMBO_BOX_CLASS (class);
    combo_box_class->changed = action_combo_box_changed;

    g_object_class_install_property (
        object_class,
        PROP_ACTION,
        g_param_spec_object (
            "action",
            "Action",
            "A GtkRadioAction",
            GTK_TYPE_RADIO_ACTION,
            G_PARAM_READWRITE));
}

static void
e_action_combo_box_init (EActionComboBox *combo_box)
{
    combo_box->priv = G_TYPE_INSTANCE_GET_PRIVATE (
        combo_box, E_TYPE_ACTION_COMBO_BOX, EActionComboBoxPrivate);

    combo_box->priv->index = g_hash_table_new_full (
        g_direct_hash, g_direct_equal,
        (GDestroyNotify) NULL,
        (GDestroyNotify) gtk_tree_row_reference_free);
}

GtkWidget *
e_action_combo_box_new (void)
{
    return e_action_combo_box_new_with_action (NULL);
}

GtkWidget *
e_action_combo_box_new_with_action (GtkRadioAction *action)
{
    return g_object_new (E_TYPE_ACTION_COMBO_BOX, "action", action, NULL);
}

GtkRadioAction *
e_action_combo_box_get_action (EActionComboBox *combo_box)
{
    g_return_val_if_fail (E_ACTION_IS_COMBO_BOX (combo_box), NULL);

    return combo_box->priv->action;
}

void
e_action_combo_box_set_action (EActionComboBox *combo_box,
                               GtkRadioAction *action)
{
    g_return_if_fail (E_ACTION_IS_COMBO_BOX (combo_box));

    if (action != NULL)
        g_return_if_fail (GTK_IS_RADIO_ACTION (action));

    if (combo_box->priv->action != NULL) {
        g_signal_handler_disconnect (
            combo_box->priv->action,
            combo_box->priv->changed_handler_id);
        g_object_unref (combo_box->priv->action);
    }

    if (combo_box->priv->action_group != NULL) {
        g_signal_handler_disconnect (
            combo_box->priv->action_group,
            combo_box->priv->group_sensitive_handler_id);
        g_signal_handler_disconnect (
            combo_box->priv->action_group,
            combo_box->priv->group_visible_handler_id);
        g_object_unref (combo_box->priv->action_group);
        combo_box->priv->action_group = NULL;
    }

    if (action != NULL)
        g_object_get (
            g_object_ref (action), "action-group",
            &combo_box->priv->action_group, NULL);

    combo_box->priv->action = action;
    action_combo_box_update_model (combo_box);

    if (combo_box->priv->action != NULL)
        combo_box->priv->changed_handler_id = g_signal_connect (
            combo_box->priv->action, "changed",
            G_CALLBACK (action_combo_box_action_changed_cb),
            combo_box);

    if (combo_box->priv->action_group != NULL) {
        g_object_ref (combo_box->priv->action_group);
        combo_box->priv->group_sensitive_handler_id =
            g_signal_connect (
                combo_box->priv->action_group,
                "notify::sensitive", G_CALLBACK (
                action_combo_box_action_group_notify_cb),
                combo_box);
        combo_box->priv->group_visible_handler_id =
            g_signal_connect (
                combo_box->priv->action_group,
                "notify::visible", G_CALLBACK (
                action_combo_box_action_group_notify_cb),
                combo_box);
    }

    g_object_notify (G_OBJECT (combo_box), "action");
}

gint
e_action_combo_box_get_current_value (EActionComboBox *combo_box)
{
    g_return_val_if_fail (E_ACTION_IS_COMBO_BOX (combo_box), 0);
    g_return_val_if_fail (combo_box->priv->action != NULL, 0);

    return gtk_radio_action_get_current_value (combo_box->priv->action);
}

void
e_action_combo_box_set_current_value (EActionComboBox *combo_box,
                                      gint current_value)
{
    g_return_if_fail (E_ACTION_IS_COMBO_BOX (combo_box));
    g_return_if_fail (combo_box->priv->action != NULL);

    gtk_radio_action_set_current_value (
        combo_box->priv->action, current_value);
}

void
e_action_combo_box_add_separator_before (EActionComboBox *combo_box,
                                         gint action_value)
{
    GtkTreeModel *model;
    GtkTreeIter iter;

    g_return_if_fail (E_ACTION_IS_COMBO_BOX (combo_box));

    /* NULL actions are rendered as separators. */
    model = gtk_combo_box_get_model (GTK_COMBO_BOX (combo_box));
    gtk_list_store_append (GTK_LIST_STORE (model), &iter);
    gtk_list_store_set (
        GTK_LIST_STORE (model), &iter, COLUMN_ACTION,
        NULL, COLUMN_SORT, (gfloat) action_value - 0.5, -1);
}

void
e_action_combo_box_add_separator_after (EActionComboBox *combo_box,
                                        gint action_value)
{
    GtkTreeModel *model;
    GtkTreeIter iter;

    g_return_if_fail (E_ACTION_IS_COMBO_BOX (combo_box));

    /* NULL actions are rendered as separators. */
    model = gtk_combo_box_get_model (GTK_COMBO_BOX (combo_box));
    gtk_list_store_append (GTK_LIST_STORE (model), &iter);
    gtk_list_store_set (
        GTK_LIST_STORE (model), &iter, COLUMN_ACTION,
        NULL, COLUMN_SORT, (gfloat) action_value + 0.5, -1);
}