libchimara/style.c

   1 #include "style.h"
   2
   3 extern ChimaraGlkPrivate *glk_data;
   4
   5 /**
   6  * glk_set_style:
   7  * @styl: The style to apply
   8  *
   9  * Changes the style of the current output stream. @styl should be one of the
  10  * <code>style_</code> constants listed above. However, any value is actually
  11  * legal; if the interpreter does not recognize the style value, it will treat
  12  * it as %style_Normal.
  13  * <note><para>
  14  *  This policy allows for the future definition of styles without breaking old
  15  *  Glk libraries.
  16  * </para></note>
  17  */
  18 void
  19 glk_set_style(glui32 styl)
  20 {
  21         g_return_if_fail(glk_data->current_stream != NULL);
  22         glk_set_style_stream(glk_data->current_stream, styl);
  23 }
  24
  25 /* Internal function: mapping from style enum to tag name */
  26 static gchar *
  27 get_tag_name(glui32 style)
  28 {
  29         switch(style) {
  30                 case style_Normal: return "normal";
  31                 case style_Emphasized: return "emphasized";
  32                 case style_Preformatted: return "preformatted";
  33                 case style_Header: return "header";
  34                 case style_Subheader: return "subheader";
  35                 case style_Alert: return "alert";
  36                 case style_Note: return "note";
  37                 case style_BlockQuote: return "block-quote";
  38                 case style_Input: return "input";
  39                 case style_User1: return "user1";
  40                 case style_User2: return "user2";
  41         }
  42
  43         WARNING("Unsupported style");
  44         return "normal";
  45 }
  46
  47 /**
  48  * glk_set_style_stream:
  49  * @str: Output stream to change the style of
  50  * @styl: The style to apply
  51  *
  52  * This changes the style of the stream @str. See glk_set_style().
  53  */
  54 void
  55 glk_set_style_stream(strid_t str, glui32 styl) {
  56         str->style = get_tag_name(styl);
  57 }
  58
  59 /* Internal function: call this to initialize the default styles to a textbuffer. */
  60 void
  61 style_init_textbuffer(GtkTextBuffer *buffer)
  62 {
  63         g_return_if_fail(buffer != NULL);
  64
  65         gtk_text_buffer_create_tag(buffer, "normal", NULL);
  66         gtk_text_buffer_create_tag(buffer, "emphasized", "style", PANGO_STYLE_ITALIC, NULL);
  67         gtk_text_buffer_create_tag(buffer, "preformatted", "font-desc", glk_data->monospace_font_desc, NULL);
  68         gtk_text_buffer_create_tag(buffer, "header", "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
  69         gtk_text_buffer_create_tag(buffer, "subheader", "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
  70         gtk_text_buffer_create_tag(buffer, "alert", "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
  71         gtk_text_buffer_create_tag(buffer, "note", "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
  72         gtk_text_buffer_create_tag(buffer, "block-quote", "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, NULL);
  73         gtk_text_buffer_create_tag(buffer, "input", NULL);
  74         gtk_text_buffer_create_tag(buffer, "user1", NULL);
  75         gtk_text_buffer_create_tag(buffer, "user2", NULL);
  76 }
  77
  78 static void
  79 color_format(glui32 val, gchar *buffer)
  80 {
  81         sprintf(buffer, "#%02X%02X%02X",
  82                 ((val & 0xff0000) >> 16),
  83                 ((val & 0x00ff00) >> 8),
  84                 (val & 0x0000ff)
  85         );
  86 }
  87
  88 /* Internal function: changes a GTK tag to correspond with the given style. */
  89 static void
  90 apply_stylehint_to_tag(GtkTextTag *tag, glui32 hint, glsi32 val)
  91 {
  92         g_return_if_fail(tag != NULL);
  93
  94         GObject *tag_object = G_OBJECT(tag);
  95         gint reverse_color = 0;
  96
  97         /* FIXME where should we keep track of this?
  98         g_object_get(tag, "reverse_color", &reverse_color, NULL);
  99         */
 100
 101         int i = 0;
 102         gchar color[20];
 103         switch(hint) {
 104         case stylehint_Indentation:
 105                 g_object_set(tag_object, "left_margin", 5*val, NULL);
 106                 g_object_set(tag_object, "right_margin", 5*val, NULL);
 107                 break;
 108
 109         case stylehint_ParaIndentation:
 110                 g_object_set(tag_object, "indent", 5*val, NULL);
 111                 break;
 112
 113         case stylehint_Justification:
 114                 switch(val) {
 115                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 116                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 117                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 118                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 119                         default:
 120                                 WARNING("Unknown justification");
 121                                 i = GTK_JUSTIFY_LEFT;
 122                 }
 123                 g_object_set(tag_object, "justification", i, NULL);
 124                 break;
 125
 126         case stylehint_Weight:
 127                 switch(val) {
 128                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 129                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 130                         case  1: i = PANGO_WEIGHT_BOLD; break;
 131                         default: WARNING("Unknown font weight");
 132                 }
 133                 g_object_set(tag_object, "weight", i, NULL);
 134                 break;
 135
 136         case stylehint_Size:
 137                 g_object_set(tag_object, "size", 14+(2*val), NULL);
 138                 break;
 139
 140         case stylehint_Oblique:
 141                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, NULL);
 142                 break;
 143
 144         case stylehint_Proportional:
 145                 g_object_set(tag_object, "font-desc", val ? glk_data->default_font_desc : glk_data->monospace_font_desc, NULL);
 146                 break;
 147
 148         case stylehint_TextColor:
 149                 color_format(val, color);
 150
 151                 if(!reverse_color)
 152                         g_object_set(tag_object, "foreground", color, NULL);
 153                 else
 154                         g_object_set(tag_object, "background", color, NULL);
 155
 156                 break;
 157
 158         case stylehint_BackColor:
 159                 color_format(val, color);
 160
 161                 if(!reverse_color)
 162                         g_object_set(tag_object, "background", color, NULL);
 163                 else
 164                         g_object_set(tag_object, "foreground", color, NULL);
 165
 166                 break;
 167
 168         case stylehint_ReverseColor:
 169                 if(reverse_color != val) {
 170                         /* Flip the fore- and background colors */
 171                         gchar* foreground_color;
 172                         gchar* background_color;
 173                         g_object_get(tag_object, "foreground", &foreground_color, NULL);
 174                         g_object_get(tag_object, "background", &background_color, NULL);
 175                         g_object_set(tag_object, "foreground", background_color, NULL);
 176                         g_object_set(tag_object, "background", foreground_color, NULL);
 177                         g_free(foreground_color);
 178                         g_free(background_color);
 179                 }
 180                 break;
 181
 182         default:
 183                 WARNING("Unknown style hint");
 184         }
 185 }
 186
 187 /**
 188  * glk_stylehint_set:
 189  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 190  * @styl: The style to set a hint for.
 191  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 192  * @val: The style hint. The meaning of this depends on @hint.
 193  *
 194  * Sets a hint about the appearance of one style for a particular type of
 195  * window. You can also set wintype to %wintype_AllTypes, which sets a hint for
 196  * all types of window.
 197  * <note><para>
 198  *  There is no equivalent constant to set a hint for all styles of a single
 199  *  window type.
 200  * </para></note>
 201  */
 202 void
 203 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 204 {
 205         gchar *tag_name = get_tag_name(styl);
 206
 207         /* Iterate over all the window and update their styles if nessecary */
 208         winid_t win = glk_window_iterate(NULL, NULL);
 209         while(win != NULL) {
 210                 if(wintype != wintype_TextBuffer)
 211                         continue; /* FIXME: add support for text grid windows */
 212
 213                 if(wintype == wintype_AllTypes || glk_window_get_type(win) == wintype) {
 214                         GtkWidget *textview = win->widget;
 215                         GtkTextBuffer *textbuffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(textview) );
 216                         GtkTextTagTable *table = gtk_text_buffer_get_tag_table(textbuffer);
 217                         GtkTextTag *to_change = gtk_text_tag_table_lookup(table, tag_name);
 218
 219                         apply_stylehint_to_tag(to_change, hint, val);
 220                 }
 221         }
 222 }
 223
 224 void
 225 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 226 {
 227 }
 228
 229 glui32
 230 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 231 {
 232         return styl1 != styl2;
 233 }