gfxmenu import

gfxmenu/gui_label.c

@@ -0,0 +1,248 @@
+/* gui_label.c - GUI component to display a line of text.  */
+/*
+ *  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/font.h>
+#include <grub/gui_string_util.h>
+
+static const char *align_options[] =
+{
+  "left",
+  "center",
+  "right",
+  0
+};
+
+enum align_mode {
+  align_left,
+  align_center,
+  align_right
+};
+
+struct grub_gui_label
+{
+  struct grub_gui_component_ops *label;
+
+  grub_gui_container_t parent;
+  grub_video_rect_t bounds;
+  char *id;
+  int preferred_width;
+  int preferred_height;
+  int visible;
+  char *text;
+  grub_font_t font;
+  grub_gui_color_t color;
+  enum align_mode align;
+};
+
+typedef struct grub_gui_label *grub_gui_label_t;
+
+static void
+label_destroy (void *vself)
+{
+  grub_gui_label_t self = vself;
+  grub_free (self->text);
+  grub_free (self);
+}
+
+static const char *
+label_get_id (void *vself)
+{
+  grub_gui_label_t self = vself;
+  return self->id;
+}
+
+static int
+label_is_instance (void *vself __attribute__((unused)), const char *type)
+{
+  return grub_strcmp (type, "component") == 0;
+}
+
+static void
+label_paint (void *vself)
+{
+  grub_gui_label_t self = vself;
+
+  if (! self->visible)
+    return;
+
+  /* Calculate the starting x coordinate.  */
+  int left_x;
+  if (self->align == align_left)
+    left_x = 0;
+  else if (self->align == align_center)
+    left_x = ((self->bounds.width
+               - grub_font_get_string_width (self->font, self->text))
+             ) / 2;
+  else if (self->align == align_right)
+    left_x = (self->bounds.width
+              - grub_font_get_string_width (self->font, self->text));
+  else
+    return;   /* Invalid alignment.  */
+
+  grub_video_rect_t vpsave;
+  grub_gui_set_viewport (&self->bounds, &vpsave);
+  grub_font_draw_string (self->text,
+                         self->font,
+                         grub_gui_map_color (self->color),
+                         left_x,
+                         grub_font_get_ascent (self->font));
+  grub_gui_restore_viewport (&vpsave);
+}
+
+static void
+label_set_parent (void *vself, grub_gui_container_t parent)
+{
+  grub_gui_label_t self = vself;
+  self->parent = parent;
+}
+
+static grub_gui_container_t
+label_get_parent (void *vself)
+{
+  grub_gui_label_t self = vself;
+  return self->parent;
+}
+
+static void
+label_set_bounds (void *vself, const grub_video_rect_t *bounds)
+{
+  grub_gui_label_t self = vself;
+  self->bounds = *bounds;
+}
+
+static void
+label_get_bounds (void *vself, grub_video_rect_t *bounds)
+{
+  grub_gui_label_t self = vself;
+  *bounds = self->bounds;
+}
+
+static void
+label_get_preferred_size (void *vself, int *width, int *height)
+{
+  grub_gui_label_t self = vself;
+  *width = grub_font_get_string_width (self->font, self->text);
+  *height = (grub_font_get_ascent (self->font)
+             + grub_font_get_descent (self->font));
+
+  /* Allow preferred dimensions to override the computed dimensions.  */
+  if (self->preferred_width >= 0)
+    *width = self->preferred_width;
+  if (self->preferred_height >= 0)
+    *height = self->preferred_height;
+}
+
+static void
+label_set_property (void *vself, const char *name, const char *value)
+{
+  grub_gui_label_t self = vself;
+  if (grub_strcmp (name, "text") == 0)
+    {
+      grub_free (self->text);
+      if (! value)
+        value = "";
+      self->text = grub_strdup (value);
+    }
+  else if (grub_strcmp (name, "font") == 0)
+    {
+      self->font = grub_font_get (value);
+    }
+  else if (grub_strcmp (name, "color") == 0)
+    {
+      grub_gui_parse_color (value, &self->color);
+    }
+  else if (grub_strcmp (name, "align") == 0)
+    {
+      int i;
+      for (i = 0; align_options[i]; i++)
+        {
+          if (grub_strcmp (align_options[i], value) == 0)
+            {
+              self->align = i;   /* Set the alignment mode.  */
+              break;
+            }
+        }
+    }
+  else if (grub_strcmp (name, "visible") == 0)
+    {
+      self->visible = grub_strcmp (value, "false") != 0;
+    }
+  else if (grub_strcmp (name, "preferred_size") == 0)
+    {
+      int w;
+      int h;
+      if (grub_gui_parse_2_tuple (value, &w, &h) == GRUB_ERR_NONE)
+        {
+          self->preferred_width = w;
+          self->preferred_height = h;
+        }
+    }
+  else if (grub_strcmp (name, "id") == 0)
+    {
+      grub_free (self->id);
+      if (value)
+        self->id = grub_strdup (value);
+      else
+        self->id = 0;
+    }
+}
+
+static struct grub_gui_component_ops label_ops =
+{
+  .destroy = label_destroy,
+  .get_id = label_get_id,
+  .is_instance = label_is_instance,
+  .paint = label_paint,
+  .set_parent = label_set_parent,
+  .get_parent = label_get_parent,
+  .set_bounds = label_set_bounds,
+  .get_bounds = label_get_bounds,
+  .get_preferred_size = label_get_preferred_size,
+  .set_property = label_set_property
+};
+
+grub_gui_component_t
+grub_gui_label_new (void)
+{
+  grub_gui_label_t label;
+  label = grub_malloc (sizeof (*label));
+  if (! label)
+    return 0;
+  label->label = &label_ops;
+  label->parent = 0;
+  label->bounds.x = 0;
+  label->bounds.y = 0;
+  label->bounds.width = 0;
+  label->bounds.height = 0;
+  label->id = 0;
+  label->preferred_width = -1;
+  label->preferred_height = -1;
+  label->visible = 1;
+  label->text = grub_strdup ("");
+  label->font = grub_font_get ("Helvetica 10");
+  label->color.red = 0;
+  label->color.green = 0;
+  label->color.blue = 0;
+  label->color.alpha = 255;
+  label->align = align_left;
+  return (grub_gui_component_t) label;
+}