path: root/widgets/misc/e-canvas-vbox.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:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include <config.h>

#include <math.h>

#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>

#include <glib/gi18n.h>
#include "e-util/e-util.h"

#include "e-canvas.h"
#include "e-canvas-utils.h"
#include "e-canvas-vbox.h"

static void e_canvas_vbox_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void e_canvas_vbox_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void e_canvas_vbox_dispose (GObject *object);

static gint e_canvas_vbox_event   (GnomeCanvasItem *item, GdkEvent *event);
static void e_canvas_vbox_realize (GnomeCanvasItem *item);

static void e_canvas_vbox_reflow (GnomeCanvasItem *item, gint flags);

static void e_canvas_vbox_real_add_item (ECanvasVbox *e_canvas_vbox, GnomeCanvasItem *item);
static void e_canvas_vbox_real_add_item_start (ECanvasVbox *e_canvas_vbox, GnomeCanvasItem *item);
static void e_canvas_vbox_resize_children (GnomeCanvasItem *item);

/* The arguments we take */
enum {
    PROP_0,
    PROP_WIDTH,
    PROP_MINIMUM_WIDTH,
    PROP_HEIGHT,
    PROP_SPACING
};

G_DEFINE_TYPE (
    ECanvasVbox,
    e_canvas_vbox,
    GNOME_TYPE_CANVAS_GROUP)

static void
e_canvas_vbox_class_init (ECanvasVboxClass *klass)
{
    GObjectClass *object_class;
    GnomeCanvasItemClass *item_class;

    object_class = (GObjectClass*) klass;
    item_class = (GnomeCanvasItemClass *) klass;

    klass->add_item       = e_canvas_vbox_real_add_item;
    klass->add_item_start = e_canvas_vbox_real_add_item_start;

    object_class->set_property = e_canvas_vbox_set_property;
    object_class->get_property = e_canvas_vbox_get_property;
    object_class->dispose      = e_canvas_vbox_dispose;

    /* GnomeCanvasItem method overrides */
    item_class->event       = e_canvas_vbox_event;
    item_class->realize     = e_canvas_vbox_realize;

    g_object_class_install_property (object_class, PROP_WIDTH,
                     g_param_spec_double ("width",
                                  "Width",
                                  "Width",
                                  0.0, G_MAXDOUBLE, 0.0,
                                  G_PARAM_READWRITE));
    g_object_class_install_property (object_class, PROP_MINIMUM_WIDTH,
                     g_param_spec_double ("minimum_width",
                                  "Minimum width",
                                  "Minimum Width",
                                  0.0, G_MAXDOUBLE, 0.0,
                                  G_PARAM_READWRITE));
    g_object_class_install_property (object_class, PROP_HEIGHT,
                     g_param_spec_double ("height",
                                  "Height",
                                  "Height",
                                  0.0, G_MAXDOUBLE, 0.0,
                                  G_PARAM_READABLE));
    g_object_class_install_property (object_class, PROP_SPACING,
                     g_param_spec_double ("spacing",
                                  "Spacing",
                                  "Spacing",
                                  0.0, G_MAXDOUBLE, 0.0,
                                  G_PARAM_READWRITE));
}

static void
e_canvas_vbox_init (ECanvasVbox *vbox)
{
    vbox->items = NULL;

    vbox->width = 10;
    vbox->minimum_width = 10;
    vbox->height = 10;
    vbox->spacing = 0;

    e_canvas_item_set_reflow_callback (GNOME_CANVAS_ITEM (vbox), e_canvas_vbox_reflow);
}

static void
e_canvas_vbox_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
    GnomeCanvasItem *item;
    ECanvasVbox *e_canvas_vbox;

    item = GNOME_CANVAS_ITEM (object);
    e_canvas_vbox = E_CANVAS_VBOX (object);

    switch (prop_id) {
    case PROP_WIDTH:
    case PROP_MINIMUM_WIDTH:
        e_canvas_vbox->minimum_width = g_value_get_double (value);
        e_canvas_vbox_resize_children (item);
        e_canvas_item_request_reflow (item);
        break;
    case PROP_SPACING:
        e_canvas_vbox->spacing = g_value_get_double (value);
        e_canvas_item_request_reflow (item);
        break;
    }
}

static void
e_canvas_vbox_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
    ECanvasVbox *e_canvas_vbox;

    e_canvas_vbox = E_CANVAS_VBOX (object);

    switch (prop_id) {
    case PROP_WIDTH:
        g_value_set_double (value, e_canvas_vbox->width);
        break;
    case PROP_MINIMUM_WIDTH:
        g_value_set_double (value, e_canvas_vbox->minimum_width);
        break;
    case PROP_HEIGHT:
        g_value_set_double (value, e_canvas_vbox->height);
        break;
    case PROP_SPACING:
        g_value_set_double (value, e_canvas_vbox->spacing);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
        break;
    }
}

/* Used from g_list_foreach(); disconnects from an item's signals */
static void
disconnect_item_cb (gpointer data, gpointer user_data)
{
    ECanvasVbox *vbox;
    GnomeCanvasItem *item;

    vbox = E_CANVAS_VBOX (user_data);

    item = GNOME_CANVAS_ITEM (data);
    g_signal_handlers_disconnect_matched (item,
                          G_SIGNAL_MATCH_DATA,
                          0, 0, NULL, NULL,
                          vbox);
}

static void
e_canvas_vbox_dispose (GObject *object)
{
    ECanvasVbox *vbox = E_CANVAS_VBOX (object);

    if (vbox->items) {
        g_list_foreach (vbox->items, disconnect_item_cb, vbox);
        g_list_free (vbox->items);
        vbox->items = NULL;
    }

    G_OBJECT_CLASS (e_canvas_vbox_parent_class)->dispose (object);
}

static gint
e_canvas_vbox_event (GnomeCanvasItem *item, GdkEvent *event)
{
    gint return_val = TRUE;

    switch (event->type) {
    case GDK_KEY_PRESS:
        switch (event->key.keyval) {
        case GDK_KEY_Left:
        case GDK_KEY_KP_Left:
        case GDK_KEY_Right:
        case GDK_KEY_KP_Right:
        case GDK_KEY_Down:
        case GDK_KEY_KP_Down:
        case GDK_KEY_Up:
        case GDK_KEY_KP_Up:
        case GDK_KEY_Return:
        case GDK_KEY_KP_Enter:
            return_val = TRUE;
            break;
        default:
            return_val = FALSE;
            break;
        }
        break;
    default:
        return_val = FALSE;
        break;
    }
    if (!return_val) {
        if (GNOME_CANVAS_ITEM_CLASS (e_canvas_vbox_parent_class)->event)
            return GNOME_CANVAS_ITEM_CLASS (e_canvas_vbox_parent_class)->event (item, event);
    }
    return return_val;

}

static void
e_canvas_vbox_realize (GnomeCanvasItem *item)
{
    if (GNOME_CANVAS_ITEM_CLASS (e_canvas_vbox_parent_class)->realize)
        (* GNOME_CANVAS_ITEM_CLASS (e_canvas_vbox_parent_class)->realize) (item);

    e_canvas_vbox_resize_children (item);
    e_canvas_item_request_reflow (item);
}

static void
e_canvas_vbox_remove_item (gpointer data, GObject *where_object_was)
{
    ECanvasVbox *vbox = data;
    vbox->items = g_list_remove (vbox->items, where_object_was);
}

static void
e_canvas_vbox_real_add_item (ECanvasVbox *e_canvas_vbox, GnomeCanvasItem *item)
{
    e_canvas_vbox->items = g_list_append (e_canvas_vbox->items, item);
    g_object_weak_ref (G_OBJECT (item),
               e_canvas_vbox_remove_item, e_canvas_vbox);
    if (GNOME_CANVAS_ITEM (e_canvas_vbox)->flags & GNOME_CANVAS_ITEM_REALIZED) {
        gnome_canvas_item_set (item,
                      "width", (gdouble) e_canvas_vbox->minimum_width,
                      NULL);
        e_canvas_item_request_reflow (item);
    }
}

static void
e_canvas_vbox_real_add_item_start (ECanvasVbox *e_canvas_vbox, GnomeCanvasItem *item)
{
    e_canvas_vbox->items = g_list_prepend (e_canvas_vbox->items, item);
    g_object_weak_ref (G_OBJECT (item),
               e_canvas_vbox_remove_item, e_canvas_vbox);
    if (GNOME_CANVAS_ITEM (e_canvas_vbox)->flags & GNOME_CANVAS_ITEM_REALIZED) {
        gnome_canvas_item_set (item,
                      "width", (gdouble) e_canvas_vbox->minimum_width,
                      NULL);
        e_canvas_item_request_reflow (item);
    }
}

static void
e_canvas_vbox_resize_children (GnomeCanvasItem *item)
{
    GList *list;
    ECanvasVbox *e_canvas_vbox;

    e_canvas_vbox = E_CANVAS_VBOX (item);
    for (list = e_canvas_vbox->items; list; list = list->next) {
        GnomeCanvasItem *child = GNOME_CANVAS_ITEM (list->data);
        gnome_canvas_item_set (child,
                      "width", (gdouble) e_canvas_vbox->minimum_width,
                      NULL);
    }
}

static void
e_canvas_vbox_reflow ( GnomeCanvasItem *item, gint flags )
{
    ECanvasVbox *e_canvas_vbox = E_CANVAS_VBOX (item);
    if (item->flags & GNOME_CANVAS_ITEM_REALIZED) {

        gdouble old_height;
        gdouble running_height;
        gdouble old_width;
        gdouble max_width;

        old_width = e_canvas_vbox->width;
        max_width = e_canvas_vbox->minimum_width;

        old_height = e_canvas_vbox->height;
        running_height = 0;

        if (e_canvas_vbox->items == NULL) {
        } else {
            GList *list;
            gdouble item_height;
            gdouble item_width;

            list = e_canvas_vbox->items;
            g_object_get (list->data,
                      "height", &item_height,
                      "width", &item_width,
                      NULL);
            e_canvas_item_move_absolute (GNOME_CANVAS_ITEM (list->data),
                            (gdouble) 0,
                            (gdouble) running_height);
            running_height += item_height;
            if (max_width < item_width)
                max_width = item_width;
            list = g_list_next (list);

            for (; list; list = g_list_next (list)) {
                running_height += e_canvas_vbox->spacing;

                g_object_get (list->data,
                          "height", &item_height,
                          "width", &item_width,
                          NULL);

                e_canvas_item_move_absolute (GNOME_CANVAS_ITEM (list->data),
                                (gdouble) 0,
                                (gdouble) running_height);

                running_height += item_height;
                if (max_width < item_width)
                    max_width = item_width;
            }

        }
        e_canvas_vbox->height = running_height;
        e_canvas_vbox->width = max_width;
        if (old_height != e_canvas_vbox->height ||
            old_width !=  e_canvas_vbox->width)
            e_canvas_item_request_parent_reflow (item);
    }
}

void
e_canvas_vbox_add_item (ECanvasVbox *e_canvas_vbox, GnomeCanvasItem *item)
{
    if (E_CANVAS_VBOX_CLASS (G_OBJECT_GET_CLASS (e_canvas_vbox))->add_item)
        (E_CANVAS_VBOX_CLASS (G_OBJECT_GET_CLASS (e_canvas_vbox))->add_item) (e_canvas_vbox, item);
}

void
e_canvas_vbox_add_item_start (ECanvasVbox *e_canvas_vbox, GnomeCanvasItem *item)
{
    if (E_CANVAS_VBOX_CLASS (G_OBJECT_GET_CLASS (e_canvas_vbox))->add_item_start)
        (E_CANVAS_VBOX_CLASS (G_OBJECT_GET_CLASS (e_canvas_vbox))->add_item_start) (e_canvas_vbox, item);
}