268 lines
6.8 KiB
C
268 lines
6.8 KiB
C
/* gui_canvas.c - GUI container allowing manually placed components. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/gui.h>
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#include <grub/gui_string_util.h>
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/* TODO Add layering so that components can be properly overlaid. */
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struct component_node
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{
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grub_gui_component_t component;
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struct component_node *next;
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};
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struct grub_gui_canvas
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{
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struct grub_gui_container_ops *container;
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grub_gui_container_t parent;
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grub_video_rect_t bounds;
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char *id;
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int preferred_width;
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int preferred_height;
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/* Component list (dummy head node). */
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struct component_node components;
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};
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typedef struct grub_gui_canvas *grub_gui_canvas_t;
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static void
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canvas_destroy (void *vself)
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{
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grub_gui_canvas_t self = vself;
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struct component_node *cur;
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struct component_node *next;
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for (cur = self->components.next; cur; cur = next)
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{
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/* Copy the 'next' pointer, since we need it for the next iteration,
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and we're going to free the memory it is stored in. */
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next = cur->next;
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/* Destroy the child component. */
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cur->component->ops->destroy (cur->component);
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/* Free the linked list node. */
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grub_free (cur);
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}
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grub_free (self);
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}
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static const char *
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canvas_get_id (void *vself)
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{
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grub_gui_canvas_t self = vself;
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return self->id;
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}
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static int
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canvas_is_instance (void *vself __attribute__((unused)), const char *type)
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{
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return (grub_strcmp (type, "component") == 0
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|| grub_strcmp (type, "container") == 0);
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}
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static void
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canvas_paint (void *vself)
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{
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grub_gui_canvas_t self = vself;
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struct component_node *cur;
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grub_video_rect_t vpsave;
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grub_gui_set_viewport (&self->bounds, &vpsave);
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for (cur = self->components.next; cur; cur = cur->next)
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{
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int pw;
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int ph;
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grub_video_rect_t r;
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grub_gui_component_t comp;
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comp = cur->component;
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/* Give the child its preferred size. */
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comp->ops->get_preferred_size (comp, &pw, &ph);
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comp->ops->get_bounds (comp, &r);
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if (r.width != pw || r.height != ph)
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{
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r.width = pw;
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r.height = ph;
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comp->ops->set_bounds (comp, &r);
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}
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/* Paint the child. */
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comp->ops->paint (comp);
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}
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grub_gui_restore_viewport (&vpsave);
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}
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static void
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canvas_set_parent (void *vself, grub_gui_container_t parent)
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{
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grub_gui_canvas_t self = vself;
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self->parent = parent;
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}
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static grub_gui_container_t
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canvas_get_parent (void *vself)
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{
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grub_gui_canvas_t self = vself;
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return self->parent;
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}
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static void
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canvas_set_bounds (void *vself, const grub_video_rect_t *bounds)
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{
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grub_gui_canvas_t self = vself;
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self->bounds = *bounds;
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}
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static void
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canvas_get_bounds (void *vself, grub_video_rect_t *bounds)
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{
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grub_gui_canvas_t self = vself;
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*bounds = self->bounds;
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}
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static void
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canvas_get_preferred_size (void *vself, int *width, int *height)
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{
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grub_gui_canvas_t self = vself;
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*width = 0;
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*height = 0;
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/* Allow preferred dimensions to override the empty dimensions. */
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if (self->preferred_width >= 0)
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*width = self->preferred_width;
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if (self->preferred_height >= 0)
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*height = self->preferred_height;
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}
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static grub_err_t
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canvas_set_property (void *vself, const char *name, const char *value)
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{
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grub_gui_canvas_t self = vself;
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if (grub_strcmp (name, "id") == 0)
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{
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grub_free (self->id);
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if (value)
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{
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self->id = grub_strdup (value);
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if (! self->id)
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return grub_errno;
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}
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else
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self->id = 0;
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}
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else if (grub_strcmp (name, "preferred_size") == 0)
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{
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int w;
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int h;
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if (grub_gui_parse_2_tuple (value, &w, &h) != GRUB_ERR_NONE)
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return grub_errno;
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self->preferred_width = w;
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self->preferred_height = h;
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}
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return grub_errno;
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}
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static void
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canvas_add (void *vself, grub_gui_component_t comp)
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{
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grub_gui_canvas_t self = vself;
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struct component_node *node;
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node = grub_malloc (sizeof (*node));
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if (! node)
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return; /* Note: probably should handle the error. */
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node->component = comp;
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node->next = self->components.next;
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self->components.next = node;
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comp->ops->set_parent (comp, (grub_gui_container_t) self);
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}
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static void
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canvas_remove (void *vself, grub_gui_component_t comp)
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{
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grub_gui_canvas_t self = vself;
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struct component_node *cur;
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struct component_node *prev;
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prev = &self->components;
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for (cur = self->components.next; cur; prev = cur, cur = cur->next)
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{
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if (cur->component == comp)
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{
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/* Unlink 'cur' from the list. */
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prev->next = cur->next;
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/* Free the node's memory (but don't destroy the component). */
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grub_free (cur);
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/* Must not loop again, since 'cur' would be dereferenced! */
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return;
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}
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}
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}
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static void
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canvas_iterate_children (void *vself,
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grub_gui_component_callback cb, void *userdata)
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{
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grub_gui_canvas_t self = vself;
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struct component_node *cur;
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for (cur = self->components.next; cur; cur = cur->next)
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cb (cur->component, userdata);
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}
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static struct grub_gui_container_ops canvas_ops =
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{
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.component =
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{
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.destroy = canvas_destroy,
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.get_id = canvas_get_id,
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.is_instance = canvas_is_instance,
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.paint = canvas_paint,
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.set_parent = canvas_set_parent,
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.get_parent = canvas_get_parent,
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.set_bounds = canvas_set_bounds,
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.get_bounds = canvas_get_bounds,
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.get_preferred_size = canvas_get_preferred_size,
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.set_property = canvas_set_property
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},
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.add = canvas_add,
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.remove = canvas_remove,
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.iterate_children = canvas_iterate_children
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};
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grub_gui_container_t
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grub_gui_canvas_new (void)
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{
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grub_gui_canvas_t canvas;
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canvas = grub_malloc (sizeof (*canvas));
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if (! canvas)
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return 0;
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canvas->container = &canvas_ops;
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canvas->parent = 0;
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canvas->bounds.x = 0;
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canvas->bounds.y = 0;
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canvas->bounds.width = 0;
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canvas->bounds.height = 0;
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canvas->id = 0;
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canvas->preferred_width = -1;
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canvas->preferred_height = -1;
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canvas->components.component = 0;
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canvas->components.next = 0;
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return (grub_gui_container_t) canvas;
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}
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