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css: Implement "bolder" and "lighter" font weights

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This commit is contained in:
Benjamin Otte 2015-02-15 05:02:33 +01:00
parent a414faa997
commit 0c4a42e629
1 changed files with 58 additions and 2 deletions
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60
gtk/gtkcssenumvalue.c
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@ -368,15 +368,68 @@ _gtk_css_font_variant_value_get (const GtkCssValue *value)
/* PangoWeight */
#define BOLDER -1
#define LIGHTER -2
static GtkCssValue *
gtk_css_value_font_weight_compute (GtkCssValue *value,
guint property_id,
GtkStyleProviderPrivate *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style,
GtkCssDependencies *dependencies)
{
PangoWeight new_weight;
int parent_value;
if (value->value >= 0)
return _gtk_css_value_ref (value);
*dependencies = GTK_CSS_DEPENDS_ON_PARENT;
if (parent_style)
parent_value = gtk_css_style_get_value (parent_style, property_id)->value;
else
parent_value = 400;
if (value->value == BOLDER)
{
if (parent_value < 400)
new_weight = PANGO_WEIGHT_NORMAL;
else if (parent_value < 600)
new_weight = PANGO_WEIGHT_BOLD;
else
new_weight = PANGO_WEIGHT_HEAVY;
}
else if (value->value == LIGHTER)
{
if (parent_value > 700)
new_weight = PANGO_WEIGHT_BOLD;
else if (parent_value > 500)
new_weight = PANGO_WEIGHT_NORMAL;
else
new_weight = PANGO_WEIGHT_THIN;
}
else
{
g_assert_not_reached ();
new_weight = PANGO_WEIGHT_NORMAL;
}
return _gtk_css_font_weight_value_new (new_weight);
}
static const GtkCssValueClass GTK_CSS_VALUE_FONT_WEIGHT = {
gtk_css_value_enum_free,
gtk_css_value_enum_compute,
gtk_css_value_font_weight_compute,
gtk_css_value_enum_equal,
gtk_css_value_enum_transition,
gtk_css_value_enum_print
};
static GtkCssValue font_weight_values[] = {
{ &GTK_CSS_VALUE_FONT_WEIGHT, 1, BOLDER, "bolder" },
{ &GTK_CSS_VALUE_FONT_WEIGHT, 1, LIGHTER, "lighter" },
{ &GTK_CSS_VALUE_FONT_WEIGHT, 1, PANGO_WEIGHT_THIN, "100" },
{ &GTK_CSS_VALUE_FONT_WEIGHT, 1, PANGO_WEIGHT_ULTRALIGHT, "200" },
{ &GTK_CSS_VALUE_FONT_WEIGHT, 1, PANGO_WEIGHT_LIGHT, "300" },
@ -396,7 +449,7 @@ _gtk_css_font_weight_value_new (PangoWeight font_weight)
w = ((font_weight + 50) / 100) * 100;
for (i = 0; i < G_N_ELEMENTS (font_weight_values); i++)
for (i = 2; i < G_N_ELEMENTS (font_weight_values); i++)
{
if (font_weight_values[i].value == w)
return _gtk_css_value_ref (&font_weight_values[i]);
@ -434,6 +487,9 @@ _gtk_css_font_weight_value_get (const GtkCssValue *value)
return value->value;
}
#undef BOLDER
#undef LIGHTER
/* PangoStretch */
static const GtkCssValueClass GTK_CSS_VALUE_FONT_STRETCH = {