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Add a function to turn a css style into pango attributes

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This is _gtk_style_context_get_pango_attributes, decoupled
from the GtkStyleContext. This will be used to drive css-styled
text rendering from css subnodes of widgets, e.g. for the value
in GtkScale.
This commit is contained in:
Matthias Clasen 2016-06-03 00:19:24 -04:00
parent a961b05200
commit 7b0929ad38
3 changed files with 79 additions and 70 deletions
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76
gtk/gtkcssstyle.c
View File

@ -28,6 +28,7 @@
#include "gtkcssinheritvalueprivate.h"
#include "gtkcssinitialvalueprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssrgbavalueprivate.h"
#include "gtkcsssectionprivate.h"
#include "gtkcssshorthandpropertyprivate.h"
#include "gtkcssstringvalueprivate.h"
@ -188,3 +189,78 @@ gtk_css_style_to_string (GtkCssStyle *style)
return g_string_free (string, FALSE);
}
static PangoUnderline
get_pango_underline_from_style (GtkTextDecorationStyle style)
{
switch (style)
{
case GTK_CSS_TEXT_DECORATION_STYLE_DOUBLE:
return PANGO_UNDERLINE_DOUBLE;
case GTK_CSS_TEXT_DECORATION_STYLE_WAVY:
return PANGO_UNDERLINE_ERROR;
case GTK_CSS_TEXT_DECORATION_STYLE_SOLID:
default:
return PANGO_UNDERLINE_SINGLE;
}
g_return_val_if_reached (PANGO_UNDERLINE_SINGLE);
}
static PangoAttrList *
add_pango_attr (PangoAttrList *attrs,
PangoAttribute *attr)
{
if (attrs == NULL)
attrs = pango_attr_list_new ();
pango_attr_list_insert (attrs, attr);
return attrs;
}
PangoAttrList *
gtk_css_style_get_pango_attributes (GtkCssStyle *style)
{
PangoAttrList *attrs = NULL;
GtkTextDecorationLine decoration_line;
GtkTextDecorationStyle decoration_style;
const GdkRGBA *color;
const GdkRGBA *decoration_color;
gint letter_spacing;
/* text-decoration */
decoration_line = _gtk_css_text_decoration_line_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_TEXT_DECORATION_LINE));
decoration_style = _gtk_css_text_decoration_style_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_TEXT_DECORATION_STYLE));
color = _gtk_css_rgba_value_get_rgba (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_COLOR));
decoration_color = _gtk_css_rgba_value_get_rgba (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_TEXT_DECORATION_COLOR));
switch (decoration_line)
{
case GTK_CSS_TEXT_DECORATION_LINE_UNDERLINE:
attrs = add_pango_attr (attrs, pango_attr_underline_new (get_pango_underline_from_style (decoration_style)));
if (!gdk_rgba_equal (color, decoration_color))
attrs = add_pango_attr (attrs, pango_attr_underline_color_new (decoration_color->red * 65535. + 0.5,
decoration_color->green * 65535. + 0.5,
decoration_color->blue * 65535. + 0.5));
break;
case GTK_CSS_TEXT_DECORATION_LINE_LINE_THROUGH:
attrs = add_pango_attr (attrs, pango_attr_strikethrough_new (TRUE));
if (!gdk_rgba_equal (color, decoration_color))
attrs = add_pango_attr (attrs, pango_attr_strikethrough_color_new (decoration_color->red * 65535. + 0.5,
decoration_color->green * 65535. + 0.5,
decoration_color->blue * 65535. + 0.5));
break;
case GTK_CSS_TEXT_DECORATION_LINE_NONE:
default:
break;
}
/* letter-spacing */
letter_spacing = _gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_LETTER_SPACING), 100);
if (letter_spacing != 0)
{
attrs = add_pango_attr (attrs, pango_attr_letter_spacing_new (letter_spacing * PANGO_SCALE));
}
return attrs;
}

2
gtk/gtkcssstyleprivate.h
View File

@ -74,6 +74,8 @@ gboolean gtk_css_style_print (GtkCssStyle
GString *string,
guint indent,
gboolean skip_initial);
PangoAttrList * gtk_css_style_get_pango_attributes (GtkCssStyle *style);
G_END_DECLS

71
gtk/gtkstylecontext.c
View File

@ -3034,79 +3034,10 @@ _gtk_style_context_get_icon_extents (GtkStyleContext *context,
x, y, width, height);
}
static PangoUnderline
get_pango_underline_from_style (GtkTextDecorationStyle style)
{
switch (style)
{
case GTK_CSS_TEXT_DECORATION_STYLE_DOUBLE:
return PANGO_UNDERLINE_DOUBLE;
case GTK_CSS_TEXT_DECORATION_STYLE_WAVY:
return PANGO_UNDERLINE_ERROR;
case GTK_CSS_TEXT_DECORATION_STYLE_SOLID:
default:
return PANGO_UNDERLINE_SINGLE;
}
g_return_val_if_reached (PANGO_UNDERLINE_SINGLE);
}
static PangoAttrList *
add_pango_attr(PangoAttrList *attrs, PangoAttribute *attr)
{
if (attrs == NULL)
attrs = pango_attr_list_new ();
pango_attr_list_insert (attrs, attr);
return attrs;
}
PangoAttrList *
_gtk_style_context_get_pango_attributes (GtkStyleContext *context)
{
PangoAttrList *attrs = NULL;
GtkTextDecorationLine decoration_line;
GtkTextDecorationStyle decoration_style;
const GdkRGBA *color;
const GdkRGBA *decoration_color;
gint letter_spacing;
/* text-decoration */
decoration_line = _gtk_css_text_decoration_line_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_TEXT_DECORATION_LINE));
decoration_style = _gtk_css_text_decoration_style_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_TEXT_DECORATION_STYLE));
color = _gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR));
decoration_color = _gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_TEXT_DECORATION_COLOR));
switch (decoration_line)
{
case GTK_CSS_TEXT_DECORATION_LINE_UNDERLINE:
attrs = add_pango_attr (attrs, pango_attr_underline_new (get_pango_underline_from_style (decoration_style)));
if (!gdk_rgba_equal (color, decoration_color))
attrs = add_pango_attr (attrs, pango_attr_underline_color_new (decoration_color->red * 65535. + 0.5,
decoration_color->green * 65535. + 0.5,
decoration_color->blue * 65535. + 0.5));
break;
case GTK_CSS_TEXT_DECORATION_LINE_LINE_THROUGH:
attrs = add_pango_attr (attrs, pango_attr_strikethrough_new (TRUE));
if (!gdk_rgba_equal (color, decoration_color))
attrs = add_pango_attr (attrs, pango_attr_strikethrough_color_new (decoration_color->red * 65535. + 0.5,
decoration_color->green * 65535. + 0.5,
decoration_color->blue * 65535. + 0.5));
break;
case GTK_CSS_TEXT_DECORATION_LINE_NONE:
default:
break;
}
/* letter-spacing */
letter_spacing = _gtk_css_number_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_LETTER_SPACING), 100);
if (letter_spacing != 0)
{
attrs = add_pango_attr (attrs, pango_attr_letter_spacing_new (letter_spacing * PANGO_SCALE));
}
return attrs;
return gtk_css_style_get_pango_attributes (gtk_style_context_lookup_style (context));
}
static AtkAttributeSet *