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- /* gui_canvas.c - GUI container allowing manually placed components. */
- /*
- * GRUB -- GRand Unified Bootloader
- * Copyright (C) 2008,2009 Free Software Foundation, Inc.
- *
- * GRUB 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
- * (at your option) any later version.
- *
- * GRUB 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 more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
- */
- #include <grub/mm.h>
- #include <grub/misc.h>
- #include <grub/gui.h>
- #include <grub/gui_string_util.h>
- /* TODO Add layering so that components can be properly overlaid. */
- struct component_node
- {
- grub_gui_component_t component;
- struct component_node *next;
- };
- struct grub_gui_canvas
- {
- struct grub_gui_container container;
- grub_gui_container_t parent;
- grub_video_rect_t bounds;
- char *id;
- /* Component list (dummy head node). */
- struct component_node components;
- };
- typedef struct grub_gui_canvas *grub_gui_canvas_t;
- static void
- canvas_destroy (void *vself)
- {
- grub_gui_canvas_t self = vself;
- struct component_node *cur;
- struct component_node *next;
- for (cur = self->components.next; cur; cur = next)
- {
- /* Copy the 'next' pointer, since we need it for the next iteration,
- and we're going to free the memory it is stored in. */
- next = cur->next;
- /* Destroy the child component. */
- cur->component->ops->destroy (cur->component);
- /* Free the linked list node. */
- grub_free (cur);
- }
- grub_free (self);
- }
- static const char *
- canvas_get_id (void *vself)
- {
- grub_gui_canvas_t self = vself;
- return self->id;
- }
- static int
- canvas_is_instance (void *vself __attribute__((unused)), const char *type)
- {
- return (grub_strcmp (type, "component") == 0
- || grub_strcmp (type, "container") == 0);
- }
- static void
- canvas_paint (void *vself, const grub_video_rect_t *region)
- {
- grub_gui_canvas_t self = vself;
- struct component_node *cur;
- grub_video_rect_t vpsave;
- grub_gui_set_viewport (&self->bounds, &vpsave);
- for (cur = self->components.next; cur; cur = cur->next)
- {
- grub_video_rect_t r;
- grub_gui_component_t comp;
- signed x, y, w, h;
- comp = cur->component;
- w = grub_fixed_sfs_multiply (self->bounds.width, comp->wfrac) + comp->w;
- h = grub_fixed_sfs_multiply (self->bounds.height, comp->hfrac) + comp->h;
- x = grub_fixed_sfs_multiply (self->bounds.width, comp->xfrac) + comp->x;
- y = grub_fixed_sfs_multiply (self->bounds.height, comp->yfrac) + comp->y;
- if (comp->ops->get_minimal_size)
- {
- unsigned mw;
- unsigned mh;
- comp->ops->get_minimal_size (comp, &mw, &mh);
- if (w < (signed) mw)
- w = mw;
- if (h < (signed) mh)
- h = mh;
- }
- /* Sanity checks. */
- if (w <= 0)
- w = 32;
- if (h <= 0)
- h = 32;
- if (x >= (signed) self->bounds.width)
- x = self->bounds.width - 32;
- if (y >= (signed) self->bounds.height)
- y = self->bounds.height - 32;
- if (x < 0)
- x = 0;
- if (y < 0)
- y = 0;
- if (x + w >= (signed) self->bounds.width)
- w = self->bounds.width - x;
- if (y + h >= (signed) self->bounds.height)
- h = self->bounds.height - y;
- r.x = x;
- r.y = y;
- r.width = w;
- r.height = h;
- comp->ops->set_bounds (comp, &r);
- /* Paint the child. */
- if (grub_video_have_common_points (region, &r))
- comp->ops->paint (comp, region);
- }
- grub_gui_restore_viewport (&vpsave);
- }
- static void
- canvas_set_parent (void *vself, grub_gui_container_t parent)
- {
- grub_gui_canvas_t self = vself;
- self->parent = parent;
- }
- static grub_gui_container_t
- canvas_get_parent (void *vself)
- {
- grub_gui_canvas_t self = vself;
- return self->parent;
- }
- static void
- canvas_set_bounds (void *vself, const grub_video_rect_t *bounds)
- {
- grub_gui_canvas_t self = vself;
- self->bounds = *bounds;
- }
- static void
- canvas_get_bounds (void *vself, grub_video_rect_t *bounds)
- {
- grub_gui_canvas_t self = vself;
- *bounds = self->bounds;
- }
- static grub_err_t
- canvas_set_property (void *vself, const char *name, const char *value)
- {
- grub_gui_canvas_t self = vself;
- if (grub_strcmp (name, "id") == 0)
- {
- grub_free (self->id);
- if (value)
- {
- self->id = grub_strdup (value);
- if (! self->id)
- return grub_errno;
- }
- else
- self->id = 0;
- }
- return grub_errno;
- }
- static void
- canvas_add (void *vself, grub_gui_component_t comp)
- {
- grub_gui_canvas_t self = vself;
- struct component_node *node;
- node = grub_malloc (sizeof (*node));
- if (! node)
- return; /* Note: probably should handle the error. */
- node->component = comp;
- node->next = self->components.next;
- self->components.next = node;
- comp->ops->set_parent (comp, (grub_gui_container_t) self);
- }
- static void
- canvas_remove (void *vself, grub_gui_component_t comp)
- {
- grub_gui_canvas_t self = vself;
- struct component_node *cur;
- struct component_node *prev;
- prev = &self->components;
- for (cur = self->components.next; cur; prev = cur, cur = cur->next)
- {
- if (cur->component == comp)
- {
- /* Unlink 'cur' from the list. */
- prev->next = cur->next;
- /* Free the node's memory (but don't destroy the component). */
- grub_free (cur);
- /* Must not loop again, since 'cur' would be dereferenced! */
- return;
- }
- }
- }
- static void
- canvas_iterate_children (void *vself,
- grub_gui_component_callback cb, void *userdata)
- {
- grub_gui_canvas_t self = vself;
- struct component_node *cur;
- for (cur = self->components.next; cur; cur = cur->next)
- cb (cur->component, userdata);
- }
- static struct grub_gui_component_ops canvas_comp_ops =
- {
- .destroy = canvas_destroy,
- .get_id = canvas_get_id,
- .is_instance = canvas_is_instance,
- .paint = canvas_paint,
- .set_parent = canvas_set_parent,
- .get_parent = canvas_get_parent,
- .set_bounds = canvas_set_bounds,
- .get_bounds = canvas_get_bounds,
- .set_property = canvas_set_property
- };
- static struct grub_gui_container_ops canvas_ops =
- {
- .add = canvas_add,
- .remove = canvas_remove,
- .iterate_children = canvas_iterate_children
- };
- grub_gui_container_t
- grub_gui_canvas_new (void)
- {
- grub_gui_canvas_t canvas;
- canvas = grub_zalloc (sizeof (*canvas));
- if (! canvas)
- return 0;
- canvas->container.ops = &canvas_ops;
- canvas->container.component.ops = &canvas_comp_ops;
- return (grub_gui_container_t) canvas;
- }
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