Move group implementation to separate files.

git-svn-id: http://svn.drobilla.net/lad/trunk/ganv@3870 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 490 insertions, 0 deletions

diff --git a/src/group.c b/src/group.c
new file mode 100644
index 0000000..1ebb42c
--- /dev/null
+++ b/src/group.c
@@ -0,0 +1,490 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2011 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv 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 General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on GnomeCanvasGroup, by Federico Mena <federico@nuclecu.unam.mx>
+ * and Raph Levien <raph@gimp.org>
+ * Copyright 1997-2000 Free Software Foundation
+ */
+
+#include <math.h>
+
+#include "ganv/canvas-base.h"
+#include "ganv/group.h"
+
+#include "./gettext.h"
+#include "./ganv-private.h"
+
+enum {
+	GROUP_PROP_0,
+	GROUP_PROP_X,
+	GROUP_PROP_Y
+};
+
+G_DEFINE_TYPE(GanvGroup, ganv_group, GANV_TYPE_ITEM)
+
+static GanvItemClass* group_parent_class;
+
+static void
+ganv_group_init(GanvGroup* group)
+{
+}
+
+static void
+ganv_group_set_property(GObject* gobject, guint param_id,
+                        const GValue* value, GParamSpec* pspec)
+{
+	g_return_if_fail(GANV_IS_GROUP(gobject));
+
+	GanvItem* item = GANV_ITEM(gobject);
+
+	switch (param_id) {
+	case GROUP_PROP_X:
+		item->x = g_value_get_double(value);
+		ganv_item_request_update(item);
+		break;
+
+	case GROUP_PROP_Y:
+		item->y = g_value_get_double(value);
+		ganv_item_request_update(item);
+		break;
+
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(gobject, param_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_group_get_property(GObject* gobject, guint param_id,
+                        GValue* value, GParamSpec* pspec)
+{
+	GanvItem* item;
+
+	g_return_if_fail(GANV_IS_GROUP(gobject));
+
+	item = GANV_ITEM(gobject);
+
+	switch (param_id) {
+	case GROUP_PROP_X:
+		g_value_set_double(value, item->x);
+		break;
+
+	case GROUP_PROP_Y:
+		g_value_set_double(value, item->y);
+		break;
+
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(gobject, param_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_group_destroy(GtkObject* object)
+{
+	GanvGroup* group;
+
+	g_return_if_fail(GANV_IS_GROUP(object));
+
+	group = GANV_GROUP(object);
+
+	while (group->item_list) {
+		// child is unref'ed by the child's group_remove().
+		gtk_object_destroy(GTK_OBJECT(group->item_list->data));
+	}
+	if (GTK_OBJECT_CLASS(group_parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(group_parent_class)->destroy)(object);
+	}
+}
+
+static void
+ganv_group_update(GanvItem* item, int flags)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  i;
+
+	group = GANV_GROUP(item);
+
+	(*group_parent_class->update)(item, flags);
+
+	double min_x = 0.0;
+	double min_y = 0.0;
+	double max_x = 0.0;
+	double max_y = 0.0;
+
+	for (list = group->item_list; list; list = list->next) {
+		i = list->data;
+
+		ganv_item_invoke_update(i, flags);
+
+		min_x = fmin(min_x, fmin(i->x1, i->x2));
+		min_y = fmin(min_y, fmin(i->y1, i->y2));
+		max_x = fmax(max_x, fmax(i->x1, i->x2));
+		max_y = fmax(max_y, fmax(i->y2, i->y2));
+	}
+	item->x1 = min_x;
+	item->y1 = min_y;
+	item->x2 = max_x;
+	item->y2 = max_y;
+}
+
+static void
+ganv_group_realize(GanvItem* item)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  i;
+
+	group = GANV_GROUP(item);
+
+	for (list = group->item_list; list; list = list->next) {
+		i = list->data;
+
+		if (!(i->object.flags & GANV_ITEM_REALIZED)) {
+			(*GANV_ITEM_GET_CLASS(i)->realize)(i);
+		}
+	}
+
+	(*group_parent_class->realize)(item);
+}
+
+static void
+ganv_group_unrealize(GanvItem* item)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  i;
+
+	group = GANV_GROUP(item);
+
+	for (list = group->item_list; list; list = list->next) {
+		i = list->data;
+
+		if (i->object.flags & GANV_ITEM_REALIZED) {
+			(*GANV_ITEM_GET_CLASS(i)->unrealize)(i);
+		}
+	}
+
+	(*group_parent_class->unrealize)(item);
+}
+
+static void
+ganv_group_map(GanvItem* item)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  i;
+
+	group = GANV_GROUP(item);
+
+	for (list = group->item_list; list; list = list->next) {
+		i = list->data;
+
+		if (!(i->object.flags & GANV_ITEM_MAPPED)) {
+			(*GANV_ITEM_GET_CLASS(i)->map)(i);
+		}
+	}
+
+	(*group_parent_class->map)(item);
+}
+
+static void
+ganv_group_unmap(GanvItem* item)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  i;
+
+	group = GANV_GROUP(item);
+
+	for (list = group->item_list; list; list = list->next) {
+		i = list->data;
+
+		if (i->object.flags & GANV_ITEM_MAPPED) {
+			(*GANV_ITEM_GET_CLASS(i)->unmap)(i);
+		}
+	}
+
+	(*group_parent_class->unmap)(item);
+}
+
+static void
+ganv_group_draw(GanvItem* item, cairo_t* cr,
+                int x, int y, int width, int height)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  child = NULL;
+
+	group = GANV_GROUP(item);
+
+	for (list = group->item_list; list; list = list->next) {
+		child = list->data;
+
+		if (((child->object.flags & GANV_ITEM_VISIBLE)
+		     && ((child->x1 < (x + width))
+		         && (child->y1 < (y + height))
+		         && (child->x2 > x)
+		         && (child->y2 > y)))
+		    || ((GTK_OBJECT_FLAGS(child) & GANV_ITEM_ALWAYS_REDRAW)
+		        && (child->x1 < child->canvas->redraw_x2)
+		        && (child->y1 < child->canvas->redraw_y2)
+		        && (child->x2 > child->canvas->redraw_x1)
+		        && (child->y2 > child->canvas->redraw_y2))) {
+			if (GANV_ITEM_GET_CLASS(child)->draw) {
+				(*GANV_ITEM_GET_CLASS(child)->draw)(
+				    child, cr, x, y, width, height);
+			}
+		}
+	}
+}
+
+static double
+ganv_group_point(GanvItem* item, double x, double y, int cx, int cy,
+                 GanvItem** actual_item)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  child, * point_item;
+	int        x1, y1, x2, y2;
+	double     gx, gy;
+	double     dist, best;
+	int        has_point;
+
+	group = GANV_GROUP(item);
+
+	x1 = cx - item->canvas->close_enough;
+	y1 = cy - item->canvas->close_enough;
+	x2 = cx + item->canvas->close_enough;
+	y2 = cy + item->canvas->close_enough;
+
+	best         = 0.0;
+	*actual_item = NULL;
+
+	gx = x;
+	gy = y;
+
+	dist = 0.0; /* keep gcc happy */
+
+	for (list = group->item_list; list; list = list->next) {
+		child = list->data;
+
+		if ((child->x1 > x2) || (child->y1 > y2) || (child->x2 < x1) || (child->y2 < y1)) {
+			continue;
+		}
+
+		point_item = NULL; /* cater for incomplete item implementations */
+
+		if ((child->object.flags & GANV_ITEM_VISIBLE)
+		    && GANV_ITEM_GET_CLASS(child)->point) {
+			dist = GANV_ITEM_GET_CLASS(child)->point(
+				child,
+				gx - child->x, gy - child->y,
+				cx, cy,
+				&point_item);
+			has_point = TRUE;
+		} else {
+			has_point = FALSE;
+		}
+
+		if (has_point
+		    && point_item
+		    && ((int)(dist * item->canvas->pixels_per_unit + 0.5)
+		        <= item->canvas->close_enough)) {
+			best         = dist;
+			*actual_item = point_item;
+		}
+	}
+
+	return best;
+}
+
+static void
+ganv_group_bounds(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
+{
+	GanvGroup* group;
+	GanvItem*  child;
+	GList*     list;
+	double     tx1, ty1, tx2, ty2;
+	double     minx, miny, maxx, maxy;
+	int        set;
+
+	group = GANV_GROUP(item);
+
+	/* Get the bounds of the first visible item */
+
+	child = NULL; /* Unnecessary but eliminates a warning. */
+
+	set = FALSE;
+
+	for (list = group->item_list; list; list = list->next) {
+		child = list->data;
+
+		if (child->object.flags & GANV_ITEM_VISIBLE) {
+			set = TRUE;
+			ganv_item_get_bounds(child, &minx, &miny, &maxx, &maxy);
+			break;
+		}
+	}
+
+	/* If there were no visible items, return an empty bounding box */
+
+	if (!set) {
+		*x1 = *y1 = *x2 = *y2 = 0.0;
+		return;
+	}
+
+	/* Now we can grow the bounds using the rest of the items */
+
+	list = list->next;
+
+	for (; list; list = list->next) {
+		child = list->data;
+
+		if (!(child->object.flags & GANV_ITEM_VISIBLE)) {
+			continue;
+		}
+
+		ganv_item_get_bounds(child, &tx1, &ty1, &tx2, &ty2);
+
+		if (tx1 < minx) {
+			minx = tx1;
+		}
+
+		if (ty1 < miny) {
+			miny = ty1;
+		}
+
+		if (tx2 > maxx) {
+			maxx = tx2;
+		}
+
+		if (ty2 > maxy) {
+			maxy = ty2;
+		}
+	}
+
+	*x1 = minx;
+	*y1 = miny;
+	*x2 = maxx;
+	*y2 = maxy;
+}
+
+static void
+ganv_group_add(GanvItem* parent, GanvItem* item)
+{
+	GanvGroup* group = GANV_GROUP(parent);
+	g_object_ref_sink(G_OBJECT(item));
+
+	if (!group->item_list) {
+		group->item_list     = g_list_append(group->item_list, item);
+		group->item_list_end = group->item_list;
+	} else {
+		group->item_list_end = g_list_append(group->item_list_end, item)->next;
+	}
+
+	if (group->item.object.flags & GANV_ITEM_REALIZED) {
+		(*GANV_ITEM_GET_CLASS(item)->realize)(item);
+	}
+
+	if (group->item.object.flags & GANV_ITEM_MAPPED) {
+		(*GANV_ITEM_GET_CLASS(item)->map)(item);
+	}
+
+	g_object_notify(G_OBJECT(item), "parent");
+}
+
+static void
+ganv_group_remove(GanvItem* parent, GanvItem* item)
+{
+	GanvGroup* group = GANV_GROUP(parent);
+	GList* children;
+
+	g_return_if_fail(GANV_IS_GROUP(group));
+	g_return_if_fail(GANV_IS_ITEM(item));
+
+	for (children = group->item_list; children; children = children->next) {
+		if (children->data == item) {
+			if (item->object.flags & GANV_ITEM_MAPPED) {
+				(*GANV_ITEM_GET_CLASS(item)->unmap)(item);
+			}
+
+			if (item->object.flags & GANV_ITEM_REALIZED) {
+				(*GANV_ITEM_GET_CLASS(item)->unrealize)(item);
+			}
+
+			/* Unparent the child */
+
+			item->parent = NULL;
+			g_object_unref(G_OBJECT(item));
+
+			/* Remove it from the list */
+
+			if (children == group->item_list_end) {
+				group->item_list_end = children->prev;
+			}
+
+			group->item_list = g_list_remove_link(group->item_list, children);
+			g_list_free(children);
+			break;
+		}
+	}
+}
+
+static void
+ganv_group_class_init(GanvGroupClass* class)
+{
+	GObjectClass*   gobject_class;
+	GtkObjectClass* object_class;
+	GanvItemClass*  item_class;
+
+	gobject_class = (GObjectClass*)class;
+	object_class  = (GtkObjectClass*)class;
+	item_class    = (GanvItemClass*)class;
+
+	group_parent_class = g_type_class_peek_parent(class);
+
+	gobject_class->set_property = ganv_group_set_property;
+	gobject_class->get_property = ganv_group_get_property;
+
+	g_object_class_install_property
+	    (gobject_class, GROUP_PROP_X,
+	    g_param_spec_double("x",
+	                        _("X"),
+	                        _("X"),
+	                        -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+	                        (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+	g_object_class_install_property
+	    (gobject_class, GROUP_PROP_Y,
+	    g_param_spec_double("y",
+	                        _("Y"),
+	                        _("Y"),
+	                        -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+	                        (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+	object_class->destroy = ganv_group_destroy;
+
+	item_class->add       = ganv_group_add;
+	item_class->remove    = ganv_group_remove;
+	item_class->update    = ganv_group_update;
+	item_class->realize   = ganv_group_realize;
+	item_class->unrealize = ganv_group_unrealize;
+	item_class->map       = ganv_group_map;
+	item_class->unmap     = ganv_group_unmap;
+	item_class->draw      = ganv_group_draw;
+	item_class->point     = ganv_group_point;
+	item_class->bounds    = ganv_group_bounds;
+}