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- /* gui_box.c - GUI container that stack 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>
- struct component_node
- {
- grub_gui_component_t component;
- struct component_node *next;
- struct component_node *prev;
- };
- typedef struct grub_gui_box *grub_gui_box_t;
- typedef void (*layout_func_t) (grub_gui_box_t self, int modify_layout,
- unsigned *minimal_width,
- unsigned *minimal_height);
- struct grub_gui_box
- {
- struct grub_gui_container container;
- grub_gui_container_t parent;
- grub_video_rect_t bounds;
- char *id;
- /* Doubly linked list of components with dummy head & tail nodes. */
- struct component_node chead;
- struct component_node ctail;
- /* The layout function: differs for vertical and horizontal boxes. */
- layout_func_t layout_func;
- };
- static void
- box_destroy (void *vself)
- {
- grub_gui_box_t self = vself;
- struct component_node *cur;
- struct component_node *next;
- for (cur = self->chead.next; cur != &self->ctail; 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 *
- box_get_id (void *vself)
- {
- grub_gui_box_t self = vself;
- return self->id;
- }
- static int
- box_is_instance (void *vself __attribute__((unused)), const char *type)
- {
- return (grub_strcmp (type, "component") == 0
- || grub_strcmp (type, "container") == 0);
- }
- static void
- layout_horizontally (grub_gui_box_t self, int modify_layout,
- unsigned *min_width, unsigned *min_height)
- {
- /* Start at the left (chead) and set the x coordinates as we go right. */
- /* All components have their width set to the box's width. */
- struct component_node *cur;
- unsigned w = 0, mwfrac = 0, h = 0, x = 0;
- grub_fixed_signed_t wfrac = 0;
- int bogus_frac = 0;
- for (cur = self->chead.next; cur != &self->ctail; cur = cur->next)
- {
- grub_gui_component_t c = cur->component;
- unsigned mw = 0, mh = 0;
- if (c->ops->get_minimal_size)
- c->ops->get_minimal_size (c, &mw, &mh);
- if (c->h > (signed) h)
- h = c->h;
- if (mh > h)
- h = mh;
- wfrac += c->wfrac;
- w += c->w;
- if (mw - c->w > 0)
- mwfrac += mw - c->w;
- }
- if (wfrac > GRUB_FIXED_1 || (w > 0 && wfrac == GRUB_FIXED_1))
- bogus_frac = 1;
- if (min_width)
- {
- if (wfrac < GRUB_FIXED_1)
- *min_width = grub_fixed_sfs_divide (w, GRUB_FIXED_1 - wfrac);
- else
- *min_width = w;
- if (*min_width < w + mwfrac)
- *min_width = w + mwfrac;
- }
- if (min_height)
- *min_height = h;
- if (!modify_layout)
- return;
- for (cur = self->chead.next; cur != &self->ctail; cur = cur->next)
- {
- grub_video_rect_t r;
- grub_gui_component_t c = cur->component;
- unsigned mw = 0, mh = 0;
- r.x = x;
- r.y = 0;
- r.height = h;
- if (c->ops->get_minimal_size)
- c->ops->get_minimal_size (c, &mw, &mh);
- r.width = c->w;
- if (!bogus_frac)
- r.width += grub_fixed_sfs_multiply (self->bounds.width, c->wfrac);
- if (r.width < mw)
- r.width = mw;
- c->ops->set_bounds (c, &r);
- x += r.width;
- }
- }
- static void
- layout_vertically (grub_gui_box_t self, int modify_layout,
- unsigned *min_width, unsigned *min_height)
- {
- /* Start at the top (chead) and set the y coordinates as we go rdown. */
- /* All components have their height set to the box's height. */
- struct component_node *cur;
- unsigned h = 0, mhfrac = 0, w = 0, y = 0;
- grub_fixed_signed_t hfrac = 0;
- int bogus_frac = 0;
- for (cur = self->chead.next; cur != &self->ctail; cur = cur->next)
- {
- grub_gui_component_t c = cur->component;
- unsigned mw = 0, mh = 0;
- if (c->ops->get_minimal_size)
- c->ops->get_minimal_size (c, &mw, &mh);
- if (c->w > (signed) w)
- w = c->w;
- if (mw > w)
- w = mw;
- hfrac += c->hfrac;
- h += c->h;
- if (mh - c->h > 0)
- mhfrac += mh - c->h;
- }
- if (hfrac > GRUB_FIXED_1 || (h > 0 && hfrac == GRUB_FIXED_1))
- bogus_frac = 1;
- if (min_height)
- {
- if (hfrac < GRUB_FIXED_1)
- *min_height = grub_fixed_sfs_divide (h, GRUB_FIXED_1 - hfrac);
- else
- *min_height = h;
- if (*min_height < h + mhfrac)
- *min_height = h + mhfrac;
- }
- if (min_width)
- *min_width = w;
- if (!modify_layout)
- return;
- for (cur = self->chead.next; cur != &self->ctail; cur = cur->next)
- {
- grub_video_rect_t r;
- grub_gui_component_t c = cur->component;
- unsigned mw = 0, mh = 0;
- r.x = 0;
- r.y = y;
- r.width = w;
- if (c->ops->get_minimal_size)
- c->ops->get_minimal_size (c, &mw, &mh);
- r.height = c->h;
- if (!bogus_frac)
- r.height += grub_fixed_sfs_multiply (self->bounds.height, c->hfrac);
- if (r.height < mh)
- r.height = mh;
- c->ops->set_bounds (c, &r);
- y += r.height;
- }
- }
- static void
- box_paint (void *vself, const grub_video_rect_t *region)
- {
- grub_gui_box_t self = vself;
- struct component_node *cur;
- grub_video_rect_t vpsave;
- grub_gui_set_viewport (&self->bounds, &vpsave);
- for (cur = self->chead.next; cur != &self->ctail; cur = cur->next)
- {
- grub_gui_component_t comp = cur->component;
- comp->ops->paint (comp, region);
- }
- grub_gui_restore_viewport (&vpsave);
- }
- static void
- box_set_parent (void *vself, grub_gui_container_t parent)
- {
- grub_gui_box_t self = vself;
- self->parent = parent;
- }
- static grub_gui_container_t
- box_get_parent (void *vself)
- {
- grub_gui_box_t self = vself;
- return self->parent;
- }
- static void
- box_set_bounds (void *vself, const grub_video_rect_t *bounds)
- {
- grub_gui_box_t self = vself;
- self->bounds = *bounds;
- self->layout_func (self, 1, 0, 0); /* Relayout the children. */
- }
- static void
- box_get_bounds (void *vself, grub_video_rect_t *bounds)
- {
- grub_gui_box_t self = vself;
- *bounds = self->bounds;
- }
- /* The box's preferred size is based on the preferred sizes
- of its children. */
- static void
- box_get_minimal_size (void *vself, unsigned *width, unsigned *height)
- {
- grub_gui_box_t self = vself;
- self->layout_func (self, 0, width, height); /* Just calculate the size. */
- }
- static grub_err_t
- box_set_property (void *vself, const char *name, const char *value)
- {
- grub_gui_box_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
- box_add (void *vself, grub_gui_component_t comp)
- {
- grub_gui_box_t self = vself;
- struct component_node *node;
- node = grub_malloc (sizeof (*node));
- if (! node)
- return; /* Note: probably should handle the error. */
- node->component = comp;
- /* Insert the node before the tail. */
- node->prev = self->ctail.prev;
- node->prev->next = node;
- node->next = &self->ctail;
- node->next->prev = node;
- comp->ops->set_parent (comp, (grub_gui_container_t) self);
- self->layout_func (self, 1, 0, 0); /* Relayout the children. */
- }
- static void
- box_remove (void *vself, grub_gui_component_t comp)
- {
- grub_gui_box_t self = vself;
- struct component_node *cur;
- for (cur = self->chead.next; cur != &self->ctail; cur = cur->next)
- {
- if (cur->component == comp)
- {
- /* Unlink 'cur' from the list. */
- cur->prev->next = cur->next;
- cur->next->prev = cur->prev;
- /* 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
- box_iterate_children (void *vself,
- grub_gui_component_callback cb, void *userdata)
- {
- grub_gui_box_t self = vself;
- struct component_node *cur;
- for (cur = self->chead.next; cur != &self->ctail; cur = cur->next)
- cb (cur->component, userdata);
- }
- static struct grub_gui_component_ops box_comp_ops =
- {
- .destroy = box_destroy,
- .get_id = box_get_id,
- .is_instance = box_is_instance,
- .paint = box_paint,
- .set_parent = box_set_parent,
- .get_parent = box_get_parent,
- .set_bounds = box_set_bounds,
- .get_bounds = box_get_bounds,
- .get_minimal_size = box_get_minimal_size,
- .set_property = box_set_property
- };
- static struct grub_gui_container_ops box_ops =
- {
- .add = box_add,
- .remove = box_remove,
- .iterate_children = box_iterate_children
- };
- /* Box constructor. Specify the appropriate layout function to create
- a horizontal or vertical stacking box. */
- static grub_gui_box_t
- box_new (layout_func_t layout_func)
- {
- grub_gui_box_t box;
- box = grub_zalloc (sizeof (*box));
- if (! box)
- return 0;
- box->container.ops = &box_ops;
- box->container.component.ops = &box_comp_ops;
- box->chead.next = &box->ctail;
- box->ctail.prev = &box->chead;
- box->layout_func = layout_func;
- return box;
- }
- /* Create a new container that stacks its child components horizontally,
- from left to right. Each child get a width corresponding to its
- preferred width. The height of each child is set the maximum of the
- preferred heights of all children. */
- grub_gui_container_t
- grub_gui_hbox_new (void)
- {
- return (grub_gui_container_t) box_new (layout_horizontally);
- }
- /* Create a new container that stacks its child components verticallyj,
- from top to bottom. Each child get a height corresponding to its
- preferred height. The width of each child is set the maximum of the
- preferred widths of all children. */
- grub_gui_container_t
- grub_gui_vbox_new (void)
- {
- return (grub_gui_container_t) box_new (layout_vertically);
- }
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