/*
 * e-attachment-button.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)
 *
 */

/* Much of the popup menu logic here was ripped from GtkMenuToolButton. */

#include "e-attachment-button.h"

#include "e-util/e-binding.h"

#define E_ATTACHMENT_BUTTON_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_ATTACHMENT_BUTTON, EAttachmentButtonPrivate))

struct _EAttachmentButtonPrivate {

    EAttachmentView *view;
    EAttachment *attachment;
    gulong reference_handler_id;

    EMutualBinding *can_show_binding;
    EMutualBinding *shown_binding;

    GtkWidget *expand_button;
    GtkWidget *toggle_button;
    GtkWidget *cell_view;
    GtkWidget *popup_menu;

    guint expandable : 1;
    guint expanded   : 1;
};

enum {
    PROP_0,
    PROP_ATTACHMENT,
    PROP_EXPANDABLE,
    PROP_EXPANDED,
    PROP_VIEW
};

G_DEFINE_TYPE (
    EAttachmentButton,
    e_attachment_button,
    GTK_TYPE_HBOX)

static void
attachment_button_menu_deactivate_cb (EAttachmentButton *button)
{
    EAttachmentView *view;
    GtkActionGroup *action_group;
    GtkToggleButton *toggle_button;

    view = e_attachment_button_get_view (button);
    action_group = e_attachment_view_get_action_group (view, "inline");
    toggle_button = GTK_TOGGLE_BUTTON (button->priv->toggle_button);

    gtk_toggle_button_set_active (toggle_button, FALSE);

    gtk_action_group_set_visible (action_group, FALSE);
}

static void
attachment_button_menu_position (GtkMenu *menu,
                                 gint *x,
                                 gint *y,
                                 gboolean *push_in,
                                 EAttachmentButton *button)
{
    GtkRequisition menu_requisition;
    GtkTextDirection direction;
    GtkAllocation allocation;
    GdkRectangle monitor;
    GdkScreen *screen;
    GdkWindow *window;
    GtkWidget *widget;
    GtkWidget *toggle_button;
    gint monitor_num;

    widget = GTK_WIDGET (button);
    toggle_button = button->priv->toggle_button;
    gtk_widget_size_request (GTK_WIDGET (menu), &menu_requisition);

    window = gtk_widget_get_parent_window (widget);
    screen = gtk_widget_get_screen (GTK_WIDGET (menu));
    monitor_num = gdk_screen_get_monitor_at_window (screen, window);
    if (monitor_num < 0)
        monitor_num = 0;
    gdk_screen_get_monitor_geometry (screen, monitor_num, &monitor);

    gtk_widget_get_allocation (widget, &allocation);

    gdk_window_get_origin (window, x, y);
    *x += allocation.x;
    *y += allocation.y;

    direction = gtk_widget_get_direction (widget);
    if (direction == GTK_TEXT_DIR_LTR)
        *x += MAX (allocation.width - menu_requisition.width, 0);
    else if (menu_requisition.width > allocation.width)
        *x -= menu_requisition.width - allocation.width;

    gtk_widget_get_allocation (toggle_button, &allocation);

    if ((*y + allocation.height +
        menu_requisition.height) <= monitor.y + monitor.height)
        *y += allocation.height;
    else if ((*y - menu_requisition.height) >= monitor.y)
        *y -= menu_requisition.height;
    else if (monitor.y + monitor.height -
        (*y + allocation.height) > *y)
        *y += allocation.height;
    else
        *y -= menu_requisition.height;

    *push_in = FALSE;
}

static void
attachment_button_select_path (EAttachmentButton *button)
{
    EAttachmentView *view;
    EAttachment *attachment;
    GtkTreeRowReference *reference;
    GtkTreePath *path;

    attachment = e_attachment_button_get_attachment (button);
    g_return_if_fail (E_IS_ATTACHMENT (attachment));

    reference = e_attachment_get_reference (attachment);
    g_return_if_fail (gtk_tree_row_reference_valid (reference));

    view = e_attachment_button_get_view (button);
    path = gtk_tree_row_reference_get_path (reference);

    e_attachment_view_unselect_all (view);
    e_attachment_view_select_path (view, path);

    gtk_tree_path_free (path);
}

static void
attachment_button_show_popup_menu (EAttachmentButton *button,
                                   GdkEventButton *event)
{
    EAttachmentView *view;
    GtkActionGroup *action_group;
    GtkToggleButton *toggle_button;

    view = e_attachment_button_get_view (button);
    action_group = e_attachment_view_get_action_group (view, "inline");
    toggle_button = GTK_TOGGLE_BUTTON (button->priv->toggle_button);

    attachment_button_select_path (button);
    gtk_toggle_button_set_active (toggle_button, TRUE);

    e_attachment_view_show_popup_menu (
        view, event, (GtkMenuPositionFunc)
        attachment_button_menu_position, button);

    gtk_action_group_set_visible (action_group, TRUE);
}

static void
attachment_button_update_cell_view (EAttachmentButton *button)
{
    GtkCellView *cell_view;
    EAttachment *attachment;
    GtkTreeRowReference *reference;
    GtkTreeModel *model = NULL;
    GtkTreePath *path = NULL;

    cell_view = GTK_CELL_VIEW (button->priv->cell_view);

    attachment = e_attachment_button_get_attachment (button);
    if (attachment == NULL)
        goto exit;

    reference = e_attachment_get_reference (attachment);
    if (reference == NULL)
        goto exit;

    model = gtk_tree_row_reference_get_model (reference);
    path = gtk_tree_row_reference_get_path (reference);

exit:
    gtk_cell_view_set_model (cell_view, model);
    gtk_cell_view_set_displayed_row (cell_view, path);

    if (path != NULL)
        gtk_tree_path_free (path);
}

static void
attachment_button_update_pixbufs (EAttachmentButton *button)
{
    GtkCellLayout *cell_layout;
    GtkCellRenderer *renderer;
    GdkPixbuf *pixbuf_expander_open;
    GdkPixbuf *pixbuf_expander_closed;