// Although we don't use this function yet, but we must create it here.
// first, for the prepare the unicode drawing support in wxUniv/x11 port.
// If we use pango to draw the text, then we must set some attributes
// for pango layout, such as "strikethrough" and "underline".
bool wxFont::SetPangoAttrs(PangoLayout* layout) const
{
if ( !IsOk() || !(GetUnderlined() || GetStrikethrough()) )
return false;
PangoAttrList* attrs = pango_attr_list_new();
PangoAttribute* a;
if ( GetUnderlined() )
{
a = pango_attr_underline_new(PANGO_UNDERLINE_SINGLE);
pango_attr_list_insert(attrs, a);
}
if ( GetStrikethrough() )
{
a = pango_attr_strikethrough_new(true);
pango_attr_list_insert(attrs, a);
}
pango_layout_set_attributes(layout, attrs);
pango_attr_list_unref(attrs);
return true;
}
bool wxFont::GTKSetPangoAttrs(PangoLayout* layout) const
{
if (!IsOk() || !(GetUnderlined() || GetStrikethrough()))
return false;
PangoAttrList* attrs = pango_attr_list_new();
PangoAttribute* a;
if (wx_pango_version_check(1,16,0))
{
// a PangoLayout which has leading/trailing spaces with underlined font
// is not correctly drawn by this pango version: Pango won't underline the spaces.
// This can be a problem; e.g. wxHTML rendering of underlined text relies on
// this behaviour. To workaround this problem, we use a special hack here
// suggested by pango maintainer Behdad Esfahbod: we prepend and append two
// empty space characters and give them a dummy colour attribute.
// This will force Pango to underline the leading/trailing spaces, too.
const char* text = pango_layout_get_text(layout);
const size_t n = strlen(text);
if ((n > 0 && text[0] == ' ') || (n > 1 && text[n - 1] == ' '))
{
wxCharBuffer buf(n + 6);
// copy the leading U+200C ZERO WIDTH NON-JOINER encoded in UTF8 format
memcpy(buf.data(), "\342\200\214", 3);
// copy the user string
memcpy(buf.data() + 3, text, n);
// copy the trailing U+200C ZERO WIDTH NON-JOINER encoded in UTF8 format
memcpy(buf.data() + 3 + n, "\342\200\214", 3);
pango_layout_set_text(layout, buf, n + 6);
// Add dummy attributes (use colour as it's invisible anyhow for 0
// width spaces) to ensure that the spaces in the beginning/end of the
// string are underlined too.
a = pango_attr_foreground_new(0x0057, 0x52A9, 0xD614);
a->start_index = 0;
a->end_index = 3;
pango_attr_list_insert(attrs, a);
a = pango_attr_foreground_new(0x0057, 0x52A9, 0xD614);
a->start_index = n + 3;
a->end_index = n + 6;
pango_attr_list_insert(attrs, a);
}
}
if (GetUnderlined())
{
a = pango_attr_underline_new(PANGO_UNDERLINE_SINGLE);
pango_attr_list_insert(attrs, a);
}
if (GetStrikethrough())
{
a = pango_attr_strikethrough_new(true);
pango_attr_list_insert(attrs, a);
}
pango_layout_set_attributes(layout, attrs);
pango_attr_list_unref(attrs);
return true;
}
