diff options
Diffstat (limited to 'src/group.c')
| -rw-r--r-- | src/group.c | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/src/group.c b/src/group.c new file mode 100644 index 0000000..b13dc13 --- /dev/null +++ b/src/group.c @@ -0,0 +1,448 @@ +/* This file is part of Ganv. + * Copyright 2007-2015 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.h" +#include "ganv/group.h" + +#include "./gettext.h" +#include "./ganv-private.h" + +enum { + GROUP_PROP_0 +}; + +G_DEFINE_TYPE(GanvGroup, ganv_group, GANV_TYPE_ITEM) + +static GanvItemClass* group_parent_class; + +static void +ganv_group_init(GanvGroup* group) +{ + GanvGroupImpl* impl = G_TYPE_INSTANCE_GET_PRIVATE( + group, GANV_TYPE_GROUP, GanvGroupImpl); + + group->impl = impl; + group->impl->item_list = NULL; + group->impl->item_list_end = NULL; +} + +static void +ganv_group_set_property(GObject* gobject, guint param_id, + const GValue* value, GParamSpec* pspec) +{ + g_return_if_fail(GANV_IS_GROUP(gobject)); + + switch (param_id) { + 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) +{ + g_return_if_fail(GANV_IS_GROUP(gobject)); + + switch (param_id) { + 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->impl->item_list) { + // child is unref'ed by the child's group_remove(). + gtk_object_destroy(GTK_OBJECT(group->impl->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 = GANV_GROUP(item); + + double min_x = 0.0; + double min_y = 0.0; + double max_x = 0.0; + double max_y = 0.0; + + for (GList* list = group->impl->item_list; list; list = list->next) { + GanvItem* i = (GanvItem*)list->data; + + ganv_item_invoke_update(i, flags); + + min_x = fmin(min_x, fmin(i->impl->x1, i->impl->x2)); + min_y = fmin(min_y, fmin(i->impl->y1, i->impl->y2)); + max_x = fmax(max_x, fmax(i->impl->x1, i->impl->x2)); + max_y = fmax(max_y, fmax(i->impl->y2, i->impl->y2)); + } + item->impl->x1 = min_x; + item->impl->y1 = min_y; + item->impl->x2 = max_x; + item->impl->y2 = max_y; + + (*group_parent_class->update)(item, flags); +} + +static void +ganv_group_realize(GanvItem* item) +{ + GanvGroup* group; + GList* list; + GanvItem* i; + + group = GANV_GROUP(item); + + for (list = group->impl->item_list; list; list = list->next) { + i = (GanvItem*)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->impl->item_list; list; list = list->next) { + i = (GanvItem*)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->impl->item_list; list; list = list->next) { + i = (GanvItem*)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->impl->item_list; list; list = list->next) { + i = (GanvItem*)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, double cx, double cy, double cw, double ch) +{ + GanvGroup* group = GANV_GROUP(item); + + // TODO: Layered drawing + + for (GList* list = group->impl->item_list; list; list = list->next) { + GanvItem* child = (GanvItem*)list->data; + + if (((child->object.flags & GANV_ITEM_VISIBLE) + && ((child->impl->x1 < (cx + cw)) + && (child->impl->y1 < (cy + ch)) + && (child->impl->x2 > cx) + && (child->impl->y2 > cy)))) { + if (GANV_ITEM_GET_CLASS(child)->draw) { + (*GANV_ITEM_GET_CLASS(child)->draw)( + child, cr, cx, cy, cw, ch); + } + } + } +} + +static double +ganv_group_point(GanvItem* item, double x, double y, GanvItem** actual_item) +{ + GanvGroup* group = GANV_GROUP(item); + + const double x1 = x - GANV_CLOSE_ENOUGH; + const double y1 = y - GANV_CLOSE_ENOUGH; + const double x2 = x + GANV_CLOSE_ENOUGH; + const double y2 = y + GANV_CLOSE_ENOUGH; + + double dist = 0.0; + double best = 0.0; + + *actual_item = NULL; + + for (GList* list = group->impl->item_list; list; list = list->next) { + GanvItem* child = (GanvItem*)list->data; + if ((child->impl->x1 > x2) || (child->impl->y1 > y2) || (child->impl->x2 < x1) || (child->impl->y2 < y1)) { + continue; + } + + GanvItem* point_item = NULL; + + int has_point = FALSE; + if ((child->object.flags & GANV_ITEM_VISIBLE) + && GANV_ITEM_GET_CLASS(child)->point) { + dist = GANV_ITEM_GET_CLASS(child)->point( + child, + x - child->impl->x, y - child->impl->y, + &point_item); + has_point = TRUE; + } + + if (has_point + && point_item + && ((int)(dist + 0.5) <= GANV_CLOSE_ENOUGH)) { + best = dist; + *actual_item = point_item; + } + } + + if (*actual_item) { + return best; + } else { + *actual_item = item; + return 0.0; + } +} + +/* Get bounds of child item in group-relative coordinates. */ +static void +get_child_bounds(GanvItem* child, double* x1, double* y1, double* x2, double* y2) +{ + ganv_item_get_bounds(child, x1, y1, x2, y2); + + // Make bounds relative to the item's parent coordinate system + *x1 -= child->impl->x; + *y1 -= child->impl->y; + *x2 -= child->impl->x; + *y2 -= child->impl->y; +} + +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->impl->item_list; list; list = list->next) { + child = (GanvItem*)list->data; + + if (child->object.flags & GANV_ITEM_VISIBLE) { + set = TRUE; + get_child_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 = (GanvItem*)list->data; + + if (!(child->object.flags & GANV_ITEM_VISIBLE)) { + continue; + } + + get_child_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->impl->item_list) { + group->impl->item_list = g_list_append(group->impl->item_list, item); + group->impl->item_list_end = group->impl->item_list; + } else { + group->impl->item_list_end = g_list_append(group->impl->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->impl->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->impl->parent = NULL; + g_object_unref(G_OBJECT(item)); + + /* Remove it from the list */ + + if (children == group->impl->item_list_end) { + group->impl->item_list_end = children->prev; + } + + group->impl->item_list = g_list_remove_link(group->impl->item_list, children); + g_list_free(children); + break; + } + } +} + +static void +ganv_group_class_init(GanvGroupClass* klass) +{ + GObjectClass* gobject_class; + GtkObjectClass* object_class; + GanvItemClass* item_class; + + gobject_class = (GObjectClass*)klass; + object_class = (GtkObjectClass*)klass; + item_class = (GanvItemClass*)klass; + + group_parent_class = (GanvItemClass*)g_type_class_peek_parent(klass); + + g_type_class_add_private(klass, sizeof(GanvGroupImpl)); + + gobject_class->set_property = ganv_group_set_property; + gobject_class->get_property = ganv_group_get_property; + + 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; +} |