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* Copyright (C) 2002 - 2004 Vivien Malerba
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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#include "mg-canvas.h"
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#include "mg-canvas-entity.h"
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#include "mg-canvas-field.h"
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#include <libmergeant/mg-field.h>
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#include <libmergeant/mg-db-table.h>
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#include <libmergeant/mg-query.h>
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#include <libmergeant/mg-entity.h>
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static void mg_canvas_entity_class_init (MgCanvasEntityClass * class);
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static void mg_canvas_entity_init (MgCanvasEntity * drag);
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static void mg_canvas_entity_dispose (GObject * object);
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static void mg_canvas_entity_finalize (GObject * object);
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static void mg_canvas_entity_set_property (GObject *object,
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static void mg_canvas_entity_get_property (GObject *object,
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struct _MgCanvasEntityPrivate
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/* UI building information */
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GSList *field_items; /* list of GnomeCanvasItem for the fields */
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GnomeCanvasItem *title;
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gdouble *field_ypos; /* array for each field's Y position in this canvas group */
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/* presentation parameters */
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/* get a pointer to the parents to be able to call their destructor */
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static GObjectClass *entity_parent_class = NULL;
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mg_canvas_entity_get_type (void)
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static GType type = 0;
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static const GTypeInfo info = {
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sizeof (MgCanvasEntityClass),
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) mg_canvas_entity_class_init,
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sizeof (MgCanvasEntity),
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(GInstanceInitFunc) mg_canvas_entity_init
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type = g_type_register_static (MG_CANVAS_ITEM_TYPE, "MgCanvasEntity", &info, 0);
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mg_canvas_entity_class_init (MgCanvasEntityClass * class)
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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entity_parent_class = g_type_class_peek_parent (class);
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object_class->dispose = mg_canvas_entity_dispose;
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object_class->finalize = mg_canvas_entity_finalize;
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object_class->set_property = mg_canvas_entity_set_property;
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object_class->get_property = mg_canvas_entity_get_property;
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g_object_class_install_property
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(object_class, PROP_ENTITY,
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g_param_spec_pointer ("entity", NULL, NULL, (G_PARAM_READABLE | G_PARAM_WRITABLE)));
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g_object_class_install_property
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(object_class, PROP_SCALE,
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g_param_spec_double ("scale", NULL, NULL, 0., G_MAXDOUBLE, 0., G_PARAM_WRITABLE));
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mg_canvas_entity_init (MgCanvasEntity * entity)
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entity->priv = g_new0 (MgCanvasEntityPrivate, 1);
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entity->priv->entity = NULL;
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entity->priv->field_ypos = NULL;
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entity->priv->x_text_space = 3.;
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entity->priv->y_text_space = 3.;
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static void clean_items (MgCanvasEntity *ce);
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static void create_items (MgCanvasEntity *ce);
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static void entity_nullified_cb (MgEntity *ent, MgCanvasEntity *ce);
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static void entity_changed_cb (MgEntity *ent, MgCanvasEntity *ce);
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mg_canvas_entity_dispose (GObject * object)
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g_return_if_fail (object != NULL);
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g_return_if_fail (IS_MG_CANVAS_ENTITY (object));
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ce = MG_CANVAS_ENTITY (object);
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if (ce->priv->entity) {
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g_signal_handlers_disconnect_by_func (G_OBJECT (ce->priv->entity),
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G_CALLBACK (entity_nullified_cb), ce);
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g_signal_handlers_disconnect_by_func (G_OBJECT (ce->priv->entity),
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G_CALLBACK (entity_changed_cb), ce);
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ce->priv->entity = NULL;
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/* for the parent class */
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entity_parent_class->dispose (object);
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mg_canvas_entity_finalize (GObject * object)
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g_return_if_fail (object != NULL);
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g_return_if_fail (IS_MG_CANVAS_ENTITY (object));
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ce = MG_CANVAS_ENTITY (object);
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if (ce->priv->field_items)
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g_slist_free (ce->priv->field_items);
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if (ce->priv->field_ypos)
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g_free (ce->priv->field_ypos);
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/* for the parent class */
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entity_parent_class->finalize (object);
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mg_canvas_entity_set_property (GObject *object,
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PangoFontDescription *font_desc, *font_copy;
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ce = MG_CANVAS_ENTITY (object);
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ptr = g_value_get_pointer (value);
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if (ptr == ce->priv->entity)
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if (ce->priv->entity) {
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g_signal_handlers_disconnect_by_func (G_OBJECT (ce->priv->entity),
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G_CALLBACK (entity_nullified_cb), ce);
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g_signal_handlers_disconnect_by_func (G_OBJECT (ce->priv->entity),
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G_CALLBACK (entity_changed_cb), ce);
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ce->priv->entity = NULL;
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g_return_if_fail (IS_MG_ENTITY (ptr));
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ce->priv->entity = ptr;
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g_signal_connect (G_OBJECT (ce->priv->entity), "nullified",
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G_CALLBACK (entity_nullified_cb), ce);
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/* Signals to keep the display up to date */
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g_signal_connect (G_OBJECT (ce->priv->entity), "changed",
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G_CALLBACK (entity_changed_cb), ce);
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scale = g_value_get_double (value);
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list = ce->priv->field_items;
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g_object_set (G_OBJECT (list->data), "scale", scale, NULL);
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list = g_slist_next (list);
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g_object_get (G_OBJECT (ce->priv->title), "font-desc", &font_desc, NULL);
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font_copy = pango_font_description_copy (font_desc);
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pango_font_description_set_size (font_copy, scale * ce->priv->init_font_size);
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g_object_set (G_OBJECT (ce->priv->title), "font-desc", font_copy, NULL);
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pango_font_description_free (font_copy);
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mg_canvas_entity_get_property (GObject *object,
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entity_nullified_cb (MgEntity *ent, MgCanvasEntity *ce)
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gtk_object_destroy (GTK_OBJECT (ce));
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entity_changed_cb (MgEntity *ent, MgCanvasEntity *ce)
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* destroy any existing GnomeCanvasItem obejcts
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clean_items (MgCanvasEntity *ce)
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/* destroy all the items in the group */
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while (GNOME_CANVAS_GROUP (ce)->item_list)
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gtk_object_destroy (GTK_OBJECT (GNOME_CANVAS_GROUP (ce)->item_list->data));
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ce->priv->title = NULL;
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/* free the fields positions */
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if (ce->priv->field_ypos) {
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g_free (ce->priv->field_ypos);
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ce->priv->field_ypos = NULL;
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static int button_item_event (GnomeCanvasItem *ci, GdkEvent *event, MgCanvasEntity *ce);
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static void field_item_destroy_cb (MgCanvasField *field, MgCanvasEntity *ce);
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* create new GnomeCanvasItem objects
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create_items (MgCanvasEntity *ce)
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GnomeCanvasItem *item;
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double x1, y1, x2, y2;
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GSList *list, *tmplist;
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gdouble x, sqsize, radius;
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gdouble title_text_height, title_text_width, total_width;
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/* WARNING: the text items (GNOME_TYPE_CANVAS_TEXT) are first drawn without taking care of the real zoom factor =>
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* we must take that into account when using the text sizes */
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gdouble scale = GNOME_CANVAS_ITEM (ce)->canvas->pixels_per_unit;
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/* Title of the Table or query */
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ce->priv->init_font_size = pango_font_description_get_size
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(GTK_WIDGET (GNOME_CANVAS_ITEM (ce)->canvas)->style->font_desc);
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cstr = mg_base_get_name (MG_BASE (ce->priv->entity));
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item = gnome_canvas_item_new (GNOME_CANVAS_GROUP (ce),
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GNOME_TYPE_CANVAS_TEXT,
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"font-desc", GTK_WIDGET (GNOME_CANVAS_ITEM (ce)->canvas)->style->font_desc,
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"weight", PANGO_WEIGHT_BOLD,
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"x", ce->priv->x_text_space,
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"y", ce->priv->y_text_space,
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"fill_color", "black",
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"justification", GTK_JUSTIFY_RIGHT,
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"anchor", GTK_ANCHOR_NORTH_WEST,
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gnome_canvas_item_get_bounds (item, &x1, &y1, &x2, &y2);
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ce->priv->title = item;
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/* Getting text metrics */
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title_text_height = (y2 - y1) * scale;
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title_text_width = (x2 - x1) * scale;
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total_width = title_text_width + 2 * ce->priv->x_text_space;
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sqsize = title_text_height * 0.6;
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list = mg_entity_get_visible_fields (ce->priv->entity);
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ce->priv->field_ypos = g_new0 (gdouble, g_slist_length (list) + 1);
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ce->priv->field_ypos [0] = title_text_height + 3* ce->priv->y_text_space;
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item = gnome_canvas_item_new (GNOME_CANVAS_GROUP (ce),
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MG_CANVAS_FIELD_TYPE,
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"y", ce->priv->field_ypos[fieldn],
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"field", tmplist->data,
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ce->priv->field_items = g_slist_append (ce->priv->field_items, item);
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g_signal_connect (G_OBJECT (item), "destroy",
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G_CALLBACK (field_item_destroy_cb), ce);
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gnome_canvas_item_get_bounds (item, &x1, &y1, &x2, &y2);
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ce->priv->field_ypos[fieldn+1] = y2;
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if (x2 - x1 > total_width)
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total_width = x2 - x1;
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tmplist = g_slist_next (tmplist);
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/* "button" to close the MgCanvasEntity */
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sqsize = title_text_height * 0.8;
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x = total_width + ce->priv->x_text_space;
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if (x - sqsize - 2*ce->priv->x_text_space < title_text_width)
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x = title_text_width + sqsize + 2*ce->priv->x_text_space;
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item = gnome_canvas_item_new (GNOME_CANVAS_GROUP (ce),
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GNOME_TYPE_CANVAS_RECT,
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"y1", ce->priv->y_text_space,
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"y2", ce->priv->y_text_space + sqsize,
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"fill_color", "white",
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"outline_color", "black",
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gnome_canvas_item_raise_to_top (item);
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g_signal_connect (G_OBJECT (item),"event",
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G_CALLBACK (button_item_event), ce);
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if (x - ce->priv->x_text_space > total_width)
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total_width = x - ce->priv->x_text_space;
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cstr = MG_CANVAS_ENTITY_COLOR;
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if (IS_MG_DB_TABLE (ce->priv->entity))
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cstr = MG_CANVAS_DB_TABLE_COLOR;
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if (IS_MG_QUERY (ce->priv->entity))
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cstr = MG_CANVAS_QUERY_COLOR;
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radius = sqsize * .2;
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item = gnome_canvas_item_new (GNOME_CANVAS_GROUP (ce),
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GNOME_TYPE_CANVAS_ELLIPSE,
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"x1", x - sqsize/2. - radius,
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"y1", ce->priv->y_text_space + sqsize/2. - radius,
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"x2", x - sqsize/2. + radius,
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"y2", ce->priv->y_text_space + sqsize/2. + radius,
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"outline_color", "black",
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gnome_canvas_item_raise_to_top (item);
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g_signal_connect (G_OBJECT (item),"event",
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G_CALLBACK (button_item_event), ce);
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/* Top little frame */
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item = gnome_canvas_item_new (GNOME_CANVAS_GROUP (ce),
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GNOME_TYPE_CANVAS_RECT,
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"x2", total_width + 2. * ce->priv->x_text_space,
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"y2", title_text_height + 2 * ce->priv->y_text_space,
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"outline_color", "black",
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gnome_canvas_item_lower_to_bottom (item);
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item = gnome_canvas_item_new (GNOME_CANVAS_GROUP (ce),
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GNOME_TYPE_CANVAS_RECT,
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"x2", total_width + 2. * ce->priv->x_text_space,
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"y2", ce->priv->field_ypos[fieldn] + 1,
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"outline_color", "black",
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"fill_color", "white",
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"width_units", 1.0, NULL);
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gnome_canvas_item_lower_to_bottom (item);
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total_width += 2. * ce->priv->x_text_space;
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/* setting the fields' background width to be the same for all */
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tmplist = ce->priv->field_items;
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g_object_set (G_OBJECT (tmplist->data), "width", total_width, NULL);
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tmplist = g_slist_next (tmplist);
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/* make sure the scale is correctly applied to text items */
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g_object_set (G_OBJECT (ce), "scale", scale, NULL);
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field_item_destroy_cb (MgCanvasField *field, MgCanvasEntity *ce)
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g_assert (g_slist_find (ce->priv->field_items, field));
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ce->priv->field_items = g_slist_remove (ce->priv->field_items, field);
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static void popup_delete_cb (GtkMenuItem *mitem, MgCanvasEntity *ce);
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button_item_event (GnomeCanvasItem *ci, GdkEvent *event, MgCanvasEntity *ce)
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gboolean done = TRUE;
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GtkWidget *menu, *entry;
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switch (event->type) {
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case GDK_BUTTON_PRESS:
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menu = gtk_menu_new ();
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entry = gtk_menu_item_new_with_label (_("Remove"));
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g_signal_connect (G_OBJECT (entry), "activate", G_CALLBACK (popup_delete_cb), ce);
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gtk_menu_append (GTK_MENU (menu), entry);
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gtk_widget_show (entry);
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gtk_menu_popup (GTK_MENU (menu), NULL, NULL,
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NULL, NULL, ((GdkEventButton *)event)->button,
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((GdkEventButton *)event)->time);
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popup_delete_cb (GtkMenuItem *mitem, MgCanvasEntity *ce)
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gitem = mg_canvas_item_get_graph_item (MG_CANVAS_ITEM (ce));
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mg_base_nullify (MG_BASE (gitem));
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* mg_canvas_entity_get_field_item
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* @ce: a #MgCanvasEntity object
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* @field: a #MgField object
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* Get the #MgCanvasField object representing @field
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* Returns: the corresponding #MgCanvasField
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mg_canvas_entity_get_field_item (MgCanvasEntity *ce, MgField *field)
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g_return_val_if_fail (ce && IS_MG_CANVAS_ENTITY (ce), NULL);
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g_return_val_if_fail (ce->priv, NULL);
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g_return_val_if_fail (ce->priv->entity, NULL);
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fields = mg_entity_get_visible_fields (ce->priv->entity);
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pos = g_slist_index (fields, field);
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g_return_val_if_fail (pos >= 0, NULL);
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return g_slist_nth_data (ce->priv->field_items, pos);
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* mg_canvas_entity_get_field_ypos
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* @ce: a #MgCanvasEntity object
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* @field: a #MgField object
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* Get the Y position of the #MgCanvasField object representing @field
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* in @ce, in @ce's coordinates.
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* Returns: the Y coordinate.
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mg_canvas_entity_get_field_ypos (MgCanvasEntity *ce, MgField *field)
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g_return_val_if_fail (ce && IS_MG_CANVAS_ENTITY (ce), 0.);
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g_return_val_if_fail (ce->priv, 0.);
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g_return_val_if_fail (ce->priv->entity, 0.);
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g_return_val_if_fail (ce->priv->field_ypos, 0.);
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pos = mg_entity_get_field_index (ce->priv->entity, field);
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g_return_val_if_fail (pos >= 0, 0.);
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return (ce->priv->field_ypos[pos+1] + ce->priv->field_ypos[pos]) / 2.;
added
removed
libmergeant/graph/mg-canvas-entity.c
