path: root/libgnomecanvas/gnome-canvas-widget.c

/*
 * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
 * All rights reserved.
 *
 * This file is part of the Gnome Library.
 *
 * The Gnome Library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * The Gnome Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the Gnome Library; see the file COPYING.LIB.  If not,
 * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
/*
  @NOTATION@
 */
/* Widget item type for GnomeCanvas widget
 *
 * GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas
 * widget.  Tk is copyrighted by the Regents of the University of California,
 * Sun Microsystems, and other parties.
 *
 *
 * Author: Federico Mena <federico@nuclecu.unam.mx>
 */

#include <config.h>
#include <math.h>
#include "gnome-canvas-widget.h"

enum {
    PROP_0,
    PROP_WIDGET,
    PROP_X,
    PROP_Y,
    PROP_WIDTH,
    PROP_HEIGHT,
    PROP_ANCHOR,
    PROP_SIZE_PIXELS
};

static void gnome_canvas_widget_class_init (GnomeCanvasWidgetClass *class);
static void gnome_canvas_widget_init       (GnomeCanvasWidget      *witem);
static void gnome_canvas_widget_destroy    (GtkObject              *object);
static void gnome_canvas_widget_get_property (GObject            *object,
                          guint               param_id,
                          GValue             *value,
                          GParamSpec         *pspec);
static void gnome_canvas_widget_set_property (GObject            *object,
                          guint               param_id,
                          const GValue       *value,
                          GParamSpec         *pspec);

static void gnome_canvas_widget_update  (GnomeCanvasItem *item,
                         gdouble *affine,
                         ArtSVP *clip_path,
                         gint flags);
static gdouble  gnome_canvas_widget_point   (GnomeCanvasItem *item,
                         gdouble x,
                         gdouble y,
                         gint cx,
                         gint cy,
                         GnomeCanvasItem **actual_item);
static void gnome_canvas_widget_bounds  (GnomeCanvasItem *item,
                         gdouble *x1,
                         gdouble *y1,
                         gdouble *x2,
                         gdouble *y2);

static void gnome_canvas_widget_render  (GnomeCanvasItem *item,
                         GnomeCanvasBuf *buf);
static void gnome_canvas_widget_draw    (GnomeCanvasItem *item,
                         GdkDrawable *drawable,
                         gint x,
                         gint y,
                         gint width,
                         gint height);

static GnomeCanvasItemClass *parent_class;

GType
gnome_canvas_widget_get_type (void)
{
    static GType widget_type;

    if (!widget_type) {
        const GTypeInfo object_info = {
            sizeof (GnomeCanvasWidgetClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) gnome_canvas_widget_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,           /* class_data */
            sizeof (GnomeCanvasWidget),
            0,          /* n_preallocs */
            (GInstanceInitFunc) gnome_canvas_widget_init,
            NULL            /* value_table */
        };

        widget_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasWidget",
                              &object_info, 0);
    }

    return widget_type;
}

static void
gnome_canvas_widget_class_init (GnomeCanvasWidgetClass *class)
{
    GObjectClass *gobject_class;
    GtkObjectClass *object_class;
    GnomeCanvasItemClass *item_class;

    gobject_class = (GObjectClass *) class;
    object_class = (GtkObjectClass *) class;
    item_class = (GnomeCanvasItemClass *) class;

    parent_class = g_type_class_peek_parent (class);

    gobject_class->set_property = gnome_canvas_widget_set_property;
    gobject_class->get_property = gnome_canvas_widget_get_property;

        g_object_class_install_property
                (gobject_class,
                 PROP_WIDGET,
                 g_param_spec_object ("widget", NULL, NULL,
                                      GTK_TYPE_WIDGET,
                                      (G_PARAM_READABLE | G_PARAM_WRITABLE)));
        g_object_class_install_property
                (gobject_class,
                 PROP_X,
                 g_param_spec_double ("x", NULL, NULL,
                      -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
                      (G_PARAM_READABLE | G_PARAM_WRITABLE)));
        g_object_class_install_property
                (gobject_class,
                 PROP_Y,
                 g_param_spec_double ("y", NULL, NULL,
                      -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
                      (G_PARAM_READABLE | G_PARAM_WRITABLE)));
        g_object_class_install_property
                (gobject_class,
                 PROP_WIDTH,
                 g_param_spec_double ("width", NULL, NULL,
                      -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
                      (G_PARAM_READABLE | G_PARAM_WRITABLE)));
        g_object_class_install_property
                (gobject_class,
                 PROP_HEIGHT,
                 g_param_spec_double ("height", NULL, NULL,
                      -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
                      (G_PARAM_READABLE | G_PARAM_WRITABLE)));
        g_object_class_install_property
                (gobject_class,
                 PROP_ANCHOR,
                 g_param_spec_enum ("anchor", NULL, NULL,
                                    GTK_TYPE_ANCHOR_TYPE,
                                    GTK_ANCHOR_NW,
                                    (G_PARAM_READABLE | G_PARAM_WRITABLE)));
        g_object_class_install_property
                (gobject_class,
                 PROP_SIZE_PIXELS,
                 g_param_spec_boolean ("size_pixels", NULL, NULL,
                       FALSE,
                       (G_PARAM_READABLE | G_PARAM_WRITABLE)));

    object_class->destroy = gnome_canvas_widget_destroy;

    item_class->update = gnome_canvas_widget_update;
    item_class->point = gnome_canvas_widget_point;
    item_class->bounds = gnome_canvas_widget_bounds;
    item_class->render = gnome_canvas_widget_render;
    item_class->draw = gnome_canvas_widget_draw;
}

static void
gnome_canvas_widget_init (GnomeCanvasWidget *witem)
{
    witem->x = 0.0;
    witem->y = 0.0;
    witem->width = 0.0;
    witem->height = 0.0;
    witem->anchor = GTK_ANCHOR_NW;
    witem->size_pixels = FALSE;
}

static void
gnome_canvas_widget_destroy (GtkObject *object)
{
    GnomeCanvasWidget *witem;

    g_return_if_fail (object != NULL);
    g_return_if_fail (GNOME_IS_CANVAS_WIDGET (object));

    witem = GNOME_CANVAS_WIDGET (object);

    if (witem->widget && !witem->in_destroy) {
        g_signal_handler_disconnect (witem->widget, witem->destroy_id);
        gtk_widget_destroy (witem->widget);
        witem->widget = NULL;
    }

    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}

static void
recalc_bounds (GnomeCanvasWidget *witem)
{
    GnomeCanvasItem *item;
    gdouble wx, wy;

    item = GNOME_CANVAS_ITEM (witem);

    /* Get world coordinates */

    wx = witem->x;
    wy = witem->y;
    gnome_canvas_item_i2w (item, &wx, &wy);

    /* Get canvas pixel coordinates */

    gnome_canvas_w2c (item->canvas, wx, wy, &witem->cx, &witem->cy);

    /* Anchor widget item */

    switch (witem->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_W:
    case GTK_ANCHOR_SW:
        break;

    case GTK_ANCHOR_N:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_S:
        witem->cx -= witem->cwidth / 2;
        break;

    case GTK_ANCHOR_NE:
    case GTK_ANCHOR_E:
    case GTK_ANCHOR_SE:
        witem->cx -= witem->cwidth;
        break;

        default:
                break;
    }

    switch (witem->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_N:
    case GTK_ANCHOR_NE:
        break;

    case GTK_ANCHOR_W:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_E:
        witem->cy -= witem->cheight / 2;
        break;

    case GTK_ANCHOR_SW:
    case GTK_ANCHOR_S:
    case GTK_ANCHOR_SE:
        witem->cy -= witem->cheight;
        break;

        default:
                break;
    }

    /* Bounds */

    item->x1 = witem->cx;
    item->y1 = witem->cy;
    item->x2 = witem->cx + witem->cwidth;
    item->y2 = witem->cy + witem->cheight;

    if (witem->widget)
        gtk_layout_move (GTK_LAYOUT (item->canvas), witem->widget,
                 witem->cx + item->canvas->zoom_xofs,
                 witem->cy + item->canvas->zoom_yofs);
}

static void
do_destroy (GtkObject *object, gpointer data)
{
    GnomeCanvasWidget *witem;

    witem = data;

    witem->in_destroy = TRUE;

    gtk_object_destroy (data);
}

static void
gnome_canvas_widget_set_property (GObject            *object,
                  guint               param_id,
                  const GValue       *value,
                  GParamSpec         *pspec)
{
    GnomeCanvasItem *item;
    GnomeCanvasWidget *witem;
    GObject *obj;
    gint update;
    gint calc_bounds;

    g_return_if_fail (object != NULL);
    g_return_if_fail (GNOME_IS_CANVAS_WIDGET (object));

    item = GNOME_CANVAS_ITEM (object);
    witem = GNOME_CANVAS_WIDGET (object);

    update = FALSE;
    calc_bounds = FALSE;

    switch (param_id) {
    case PROP_WIDGET:
        if (witem->widget) {
            g_signal_handler_disconnect (witem->widget, witem->destroy_id);
            gtk_container_remove (GTK_CONTAINER (item->canvas), witem->widget);
        }

        obj = g_value_get_object (value);
        if (obj) {
            witem->widget = GTK_WIDGET (obj);
            witem->destroy_id = g_signal_connect (obj, "destroy",
                                  G_CALLBACK (do_destroy),
                                  witem);
            gtk_layout_put (GTK_LAYOUT (item->canvas), witem->widget,
                    witem->cx + item->canvas->zoom_xofs,
                    witem->cy + item->canvas->zoom_yofs);
        }

        update = TRUE;
        break;

    case PROP_X:
        if (witem->x != g_value_get_double (value))
        {
            witem->x = g_value_get_double (value);
            calc_bounds = TRUE;
        }
        break;

    case PROP_Y:
        if (witem->y != g_value_get_double (value))
        {
            witem->y = g_value_get_double (value);
            calc_bounds = TRUE;
        }
        break;

    case PROP_WIDTH:
        if (witem->width != fabs (g_value_get_double (value)))
        {
            witem->width = fabs (g_value_get_double (value));
            update = TRUE;
        }
        break;

    case PROP_HEIGHT:
        if (witem->height != fabs (g_value_get_double (value)))
        {
            witem->height = fabs (g_value_get_double (value));
            update = TRUE;
        }
        break;

    case PROP_ANCHOR:
        if (witem->anchor != g_value_get_enum (value))
        {
            witem->anchor = g_value_get_enum (value);
            update = TRUE;
        }
        break;

    case PROP_SIZE_PIXELS:
        if (witem->size_pixels != g_value_get_boolean (value))
        {
            witem->size_pixels = g_value_get_boolean (value);
            update = TRUE;
        }
        break;

    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
        break;
    }

    if (update)
        (* GNOME_CANVAS_ITEM_GET_CLASS (item)->update) (item, NULL, NULL, 0);

    if (calc_bounds)
        recalc_bounds (witem);
}

static void
gnome_canvas_widget_get_property (GObject            *object,
                  guint               param_id,
                  GValue             *value,
                  GParamSpec         *pspec)
{
    GnomeCanvasWidget *witem;

    g_return_if_fail (object != NULL);
    g_return_if_fail (GNOME_IS_CANVAS_WIDGET (object));

    witem = GNOME_CANVAS_WIDGET (object);

    switch (param_id) {
    case PROP_WIDGET:
        g_value_set_object (value, (GObject *) witem->widget);
        break;

    case PROP_X:
        g_value_set_double (value, witem->x);
        break;

    case PROP_Y:
        g_value_set_double (value, witem->y);
        break;

    case PROP_WIDTH:
        g_value_set_double (value, witem->width);
        break;

    case PROP_HEIGHT:
        g_value_set_double (value, witem->height);
        break;

    case PROP_ANCHOR:
        g_value_set_enum (value, witem->anchor);
        break;

    case PROP_SIZE_PIXELS:
        g_value_set_boolean (value, witem->size_pixels);
        break;

    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
        break;
    }
}

static void
gnome_canvas_widget_update (GnomeCanvasItem *item,
                            gdouble *affine,
                            ArtSVP *clip_path,
                            gint flags)
{
    GnomeCanvasWidget *witem;

    witem = GNOME_CANVAS_WIDGET (item);

    if (parent_class->update)
        (* parent_class->update) (item, affine, clip_path, flags);

    if (witem->widget) {
        if (witem->size_pixels) {
            witem->cwidth = (gint) (witem->width + 0.5);
            witem->cheight = (gint) (witem->height + 0.5);
        } else {
            witem->cwidth = (gint) (witem->width * item->canvas->pixels_per_unit + 0.5);
            witem->cheight = (gint) (witem->height * item->canvas->pixels_per_unit + 0.5);
        }

        gtk_widget_set_size_request (witem->widget, witem->cwidth, witem->cheight);
    } else {
        witem->cwidth = 0.0;
        witem->cheight = 0.0;
    }

    recalc_bounds (witem);
}

static void
gnome_canvas_widget_render (GnomeCanvasItem *item,
                GnomeCanvasBuf *buf)
{
#if 0
    GnomeCanvasWidget *witem;

    witem = GNOME_CANVAS_WIDGET (item);

    if (witem->widget)
        gtk_widget_queue_draw (witem->widget);
#endif

}

static void
gnome_canvas_widget_draw (GnomeCanvasItem *item,
              GdkDrawable *drawable,
              gint x, gint y,
              gint width, gint height)
{
#if 0
    GnomeCanvasWidget *witem;

    witem = GNOME_CANVAS_WIDGET (item);

    if (witem->widget)
        gtk_widget_queue_draw (witem->widget);
#endif
}

static double
gnome_canvas_widget_point (GnomeCanvasItem *item, gdouble x, gdouble y,
               gint cx, gint cy, GnomeCanvasItem **actual_item)
{
    GnomeCanvasWidget *witem;
    gdouble x1, y1, x2, y2;
    gdouble dx, dy;

    witem = GNOME_CANVAS_WIDGET (item);

    *actual_item = item;

    gnome_canvas_c2w (item->canvas, witem->cx, witem->cy, &x1, &y1);

    x2 = x1 + (witem->cwidth - 1) / item->canvas->pixels_per_unit;
    y2 = y1 + (witem->cheight - 1) / item->canvas->pixels_per_unit;

    /* Is point inside widget bounds? */

    if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2))
        return 0.0;

    /* Point is outside widget bounds */

    if (x < x1)
        dx = x1 - x;
    else if (x > x2)
        dx = x - x2;
    else
        dx = 0.0;

    if (y < y1)
        dy = y1 - y;
    else if (y > y2)
        dy = y - y2;
    else
        dy = 0.0;

    return sqrt (dx * dx + dy * dy);
}

static void
gnome_canvas_widget_bounds (GnomeCanvasItem *item,
                            gdouble *x1,
                            gdouble *y1,
                            gdouble *x2,
                            gdouble *y2)
{
    GnomeCanvasWidget *witem;

    witem = GNOME_CANVAS_WIDGET (item);

    *x1 = witem->x;
    *y1 = witem->y;

    switch (witem->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_W:
    case GTK_ANCHOR_SW:
        break;

    case GTK_ANCHOR_N:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_S:
        *x1 -= witem->width / 2.0;
        break;

    case GTK_ANCHOR_NE:
    case GTK_ANCHOR_E:
    case GTK_ANCHOR_SE:
        *x1 -= witem->width;
        break;

        default:
                break;
    }

    switch (witem->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_N:
    case GTK_ANCHOR_NE:
        break;

    case GTK_ANCHOR_W:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_E:
        *y1 -= witem->height / 2.0;
        break;

    case GTK_ANCHOR_SW:
    case GTK_ANCHOR_S:
    case GTK_ANCHOR_SE:
        *y1 -= witem->height;
        break;

        default:
                break;
    }

    *x2 = *x1 + witem->width;
    *y2 = *y1 + witem->height;
}