blob: b3919c2d3ea460e6803fbd28ef468cd81b36e693 [file] [log] [blame]
/* 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;
}