path: root/widgets/misc/e-combo-cell-editable.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/>
 *
 *
 * Authors:
 *      Mike Kestner  <mkestner@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <gdk/gdkkeysyms.h>

#include "e-combo-cell-editable.h"

struct _EComboCellEditablePriv {
    GtkEntry *entry;
    GtkWidget *popup;
    GtkTreeView *tree_view;
    gboolean cancelled;
    GList *list;
};

#define GRAB_MASK  (GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK)

/* Forward Declarations */
static void e_combo_cell_editable_interface_init
                    (GtkCellEditableIface *interface);

G_DEFINE_TYPE_WITH_CODE (
    EComboCellEditable,
    e_combo_cell_editable,
    GTK_TYPE_EVENT_BOX,
    G_IMPLEMENT_INTERFACE (
        GTK_TYPE_CELL_EDITABLE,
        e_combo_cell_editable_interface_init))

static void
kill_popup (EComboCellEditable *ecce)
{
    gtk_grab_remove (GTK_WIDGET (ecce->priv->tree_view));
    gtk_widget_destroy (ecce->priv->popup);

    gtk_cell_editable_editing_done (GTK_CELL_EDITABLE (ecce));
    gtk_cell_editable_remove_widget (GTK_CELL_EDITABLE (ecce));
}

static gboolean
popup_key_press_cb (GtkWidget *widget, GdkEventKey *event, EComboCellEditable *ecce)
{
    switch (event->keyval) {
    case GDK_KEY_Escape:
        ecce->priv->cancelled = TRUE;
        kill_popup (ecce);
        break;

    case GDK_KEY_Return:
    case GDK_KEY_KP_Enter:
        ecce->priv->cancelled = FALSE;
        kill_popup (ecce);
        break;

    default:
        return FALSE;
    }

    return TRUE;
}

static gboolean
popup_button_press_cb (GtkWidget *widget, GdkEventButton *event, EComboCellEditable *ecce)
{
    GtkAllocation alloc;
    GdkWindow *window;
    gdouble rel_x, rel_y;
    gint win_x, win_y;

    if (event->button != 1)
        return FALSE;

    window = gtk_widget_get_window (widget);
    gdk_window_get_root_origin (window, &win_x, &win_y);
    gtk_widget_get_allocation (ecce->priv->popup, &alloc);

    rel_x = event->x_root - win_x - alloc.x;
    rel_y = event->y_root - win_y - alloc.y;

    if (rel_x > 0 && rel_x < alloc.width && rel_y > 0 && rel_y < alloc.height)
        return FALSE;

    ecce->priv->cancelled = TRUE;
    kill_popup (ecce);

    return FALSE;
}

static gboolean
tree_button_release_cb (GtkWidget *widget, GdkEventButton *event, EComboCellEditable *ecce)
{
    kill_popup (ecce);
    return TRUE;
}

static void
selection_changed_cb (GtkTreeSelection *selection, EComboCellEditable *ecce)
{
    GtkTreeModel *model;
    GtkTreeIter iter;
    gchar *text;

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

    gtk_tree_model_get (model, &iter, 0, &text, -1);
    e_combo_cell_editable_set_text (ecce, text);
    g_free (text);
}

static void
build_popup (EComboCellEditable *ecce)
{
    GtkWidget *frame;
    GtkTreeSelection *selection;
    GtkTreeModel *model;
    GtkTreeIter iter;
    GList *l;

    ecce->priv->popup = gtk_window_new (GTK_WINDOW_POPUP);

    g_signal_connect (ecce->priv->popup, "button-press-event", G_CALLBACK (popup_button_press_cb), ecce);
    g_signal_connect (ecce->priv->popup, "key-press-event", G_CALLBACK (popup_key_press_cb), ecce);

    frame = gtk_frame_new (NULL);
    gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
    gtk_widget_show (frame);
    gtk_container_add (GTK_CONTAINER (ecce->priv->popup), frame);
    gtk_window_set_type_hint (GTK_WINDOW (ecce->priv->popup), GDK_WINDOW_TYPE_HINT_COMBO);
    ecce->priv->tree_view = GTK_TREE_VIEW (gtk_tree_view_new ());
    model = GTK_TREE_MODEL (gtk_list_store_new (1, G_TYPE_STRING));

    for (l = ecce->priv->list; l; l = l->next) {
        gtk_list_store_append (GTK_LIST_STORE (model), &iter);
        gtk_list_store_set (GTK_LIST_STORE (model), &iter, 0, l->data, -1);
    }

    gtk_tree_view_set_model (ecce->priv->tree_view, model);
    g_object_unref (model);
    gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET (ecce->priv->tree_view));

    gtk_tree_view_set_headers_visible (ecce->priv->tree_view, FALSE);

    gtk_tree_view_insert_column_with_attributes (ecce->priv->tree_view, 0, NULL,
                             gtk_cell_renderer_text_new (),
                             "text", 0,
                             NULL);

    g_signal_connect (ecce->priv->tree_view, "button-release-event", G_CALLBACK (tree_button_release_cb), ecce);

    selection = gtk_tree_view_get_selection (ecce->priv->tree_view);
    gtk_tree_selection_set_mode (selection, GTK_SELECTION_BROWSE);
    g_signal_connect (selection, "changed", G_CALLBACK (selection_changed_cb), ecce);

    gtk_widget_show (GTK_WIDGET (ecce->priv->tree_view));
}

static gint
lookup_row (GList *list, const gchar *text)
{
    GList *l;
    gint result = 0;

    for (l = list; l; l = l->next, result++)
        if (!g_utf8_collate (text, (gchar *) l->data))
            break;

    return result;
}

static void
set_cursor (GtkTreeView *tree_view, gint index)
{
    GtkTreePath *path = gtk_tree_path_new ();
    gtk_tree_path_append_index (path, index);

    gtk_tree_view_set_cursor (tree_view, path, NULL, FALSE);

    gtk_tree_path_free (path);
}

static void
grab_popup (GdkWindow *popup)
{
    gdk_pointer_grab (popup, TRUE, GRAB_MASK, NULL, NULL, gtk_get_current_event_time ());
    gdk_keyboard_grab (popup, TRUE, gtk_get_current_event_time ());
}

static void
position_popup (EComboCellEditable *ecce, gint x, gint y, gint offset)
{
    GtkRequisition req;

    gtk_widget_realize (ecce->priv->popup);
    gtk_widget_get_preferred_size (ecce->priv->popup, &req, NULL);

    if (req.height > gdk_screen_height () - y) {
        y -= (offset + req.height);
        if (y < 0)
            y = 0;
    }

    gtk_window_move (GTK_WINDOW (ecce->priv->popup), x, y);
    gtk_widget_show (ecce->priv->popup);
}

static void
show_popup (EComboCellEditable *ecce)
{
    gint row;
    GtkAllocation  alloc;
    GdkWindow *window;
    gint x, y;

    if (!ecce->priv->list)
        return;

    build_popup (ecce);
    row = lookup_row (ecce->priv->list, e_combo_cell_editable_get_text (ecce));
    set_cursor (ecce->priv->tree_view, row);

    gtk_editable_select_region (GTK_EDITABLE (ecce->priv->entry), 0, 0);

    window = gtk_widget_get_window (GTK_WIDGET (ecce));
    gtk_widget_get_allocation (GTK_WIDGET (ecce), &alloc);
    gdk_window_get_origin (window, &x, &y);

    position_popup (ecce, x, y + alloc.height, alloc.height);

    gtk_grab_add (ecce->priv->popup);
    gtk_widget_grab_focus (GTK_WIDGET (ecce->priv->tree_view));

    window = gtk_widget_get_window (ecce->priv->popup);
    grab_popup (window);
}

static void
button_clicked_cb (GtkButton *btn, EComboCellEditable *ecce)
{
    if (ecce->priv->popup) {
        kill_popup (ecce);
        return;
    }

    show_popup (ecce);
}

static void
entry_activated_cb (GtkEntry *entry, EComboCellEditable *widget)
{
    gtk_cell_editable_editing_done (GTK_CELL_EDITABLE (widget));
    gtk_cell_editable_remove_widget (GTK_CELL_EDITABLE (widget));
}

static gboolean
entry_key_press_event_cb (GtkEntry *entry, GdkEventKey *key_event, EComboCellEditable *ecce)
{
    if (key_event->keyval == GDK_KEY_Escape) {
        ecce->priv->cancelled = TRUE;
        gtk_cell_editable_editing_done (GTK_CELL_EDITABLE (ecce));
        gtk_cell_editable_remove_widget (GTK_CELL_EDITABLE (ecce));
        return TRUE;
    }

    if (key_event->state & GDK_MOD1_MASK
        && key_event->keyval == GDK_KEY_Down) {
        if (!ecce->priv->popup)
            show_popup (ecce);

        return TRUE;
    }

    return FALSE;
}

static void
ecce_start_editing (GtkCellEditable *cell_editable, GdkEvent *event)
{
    EComboCellEditable *ecce = E_COMBO_CELL_EDITABLE (cell_editable);

    gtk_editable_select_region (GTK_EDITABLE (ecce->priv->entry), 0, -1);
}

static void
e_combo_cell_editable_interface_init (GtkCellEditableIface *interface)
{
    interface->start_editing = ecce_start_editing;
}

static void
ecce_finalize (GObject *object)
{
    EComboCellEditable *ecce = (EComboCellEditable *) object;

    g_free (ecce->priv);

    G_OBJECT_CLASS (e_combo_cell_editable_parent_class)->finalize (object);
}

static void
e_combo_cell_editable_init (EComboCellEditable *ecce)
{
    GtkWidget *entry, *btn, *box;

    box = gtk_hbox_new (FALSE, 0);
    gtk_widget_show (box);
    gtk_container_add (GTK_CONTAINER (ecce), box);

    ecce->priv = g_new0 (EComboCellEditablePriv, 1);

    entry = gtk_entry_new ();
    ecce->priv->entry = GTK_ENTRY (entry);
    gtk_entry_set_has_frame (ecce->priv->entry, FALSE);
    gtk_editable_set_editable (GTK_EDITABLE (ecce->priv->entry), FALSE);
    g_signal_connect (entry, "activate", G_CALLBACK (entry_activated_cb), ecce);
    g_signal_connect (entry, "key_press_event", G_CALLBACK (entry_key_press_event_cb), ecce);
    gtk_widget_show (entry);
    gtk_box_pack_start (GTK_BOX (box), entry, TRUE, TRUE, 0);

    btn = gtk_button_new ();
    gtk_container_add (GTK_CONTAINER (btn), gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_OUT));
    g_signal_connect (btn, "clicked", (GCallback) button_clicked_cb, ecce);
    gtk_widget_show_all (btn);
    gtk_box_pack_start (GTK_BOX (box), btn, FALSE, TRUE, 0);
}

static void
ecce_grab_focus (GtkWidget *widget)
{
    EComboCellEditable *ecce = E_COMBO_CELL_EDITABLE (widget);

    gtk_widget_grab_focus (GTK_WIDGET (ecce->priv->entry));
}

static void
e_combo_cell_editable_class_init (EComboCellEditableClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;

    object_class = G_OBJECT_CLASS (class);
    object_class->finalize = ecce_finalize;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->grab_focus = ecce_grab_focus;
}

GtkCellEditable *
e_combo_cell_editable_new (void)
{
    return g_object_new (E_TYPE_COMBO_CELL_EDITABLE, NULL);
}

const GList *
e_combo_cell_editable_get_list (EComboCellEditable *ecce)
{
    g_return_val_if_fail (E_COMBO_CELL_EDITABLE (ecce), NULL);

    return ecce->priv->list;
}

void
e_combo_cell_editable_set_list (EComboCellEditable *ecce, GList *list)
{
    g_return_if_fail (E_IS_COMBO_CELL_EDITABLE (ecce));

    ecce->priv->list = list;
}

const gchar *
e_combo_cell_editable_get_text (EComboCellEditable *ecce)
{
    g_return_val_if_fail (E_COMBO_CELL_EDITABLE (ecce), NULL);

    return gtk_entry_get_text (ecce->priv->entry);
}

void
e_combo_cell_editable_set_text (EComboCellEditable *ecce, const gchar *text)
{
    g_return_if_fail (E_IS_COMBO_CELL_EDITABLE (ecce));

    gtk_entry_set_text (ecce->priv->entry, text ? text : "");
}

gboolean
e_combo_cell_editable_cancelled (EComboCellEditable *ecce)
{
    g_return_val_if_fail (E_IS_COMBO_CELL_EDITABLE (ecce), FALSE);

    return ecce->priv->cancelled;
}