我有一个gtk.TextView我想添加类似标记的文本。我知道这可以通过使用gtk.TextTag它来实现，您可以使用与 pango 标记字符串类似的属性来创建它。我注意到没有简单的方法可以gtk.TextBuffer像使用多个其他小部件一样说 set_markup。相反，您必须创建一个 TextTag，为其提供属性，然后将其插入到 TextBuffer 的 TagTable 中，指定标签适用的迭代器。
理想情况下，我想创建一个可以将 pango 标记字符串转换为 TextTag 以获得相同效果的函数。但是 gtk 似乎没有内置该功能。我注意到您可以pango.parse_markup()在标记的字符串上使用它，它将创建一个pango.AttributeList包含有关在字符串上设置的属性和它们出现的索引的信息。但是每种类型的属性都有细微的差异，因此很难对每种情况进行概括。有没有更好的方法来解决这个问题？还是 pango 标记只是不打算转换为gtk.TextTag's？
我终于找到了自己的解决方案来解决这个问题。我创建了一个解析标记字符串的函数（使用pango.parse_markup）。通过阅读文档和 python 自省，我能够弄清楚如何pango.Attribute将其转换为GtkTextTag可以使用的属性。
这是功能：
def parse_markup_string(string):
'''
Parses the string and returns a MarkupProps instance
'''
#The 'value' of an attribute...for some reason the same attribute is called several different things...
attr_values = ('value', 'ink_rect', 'logical_rect', 'desc', 'color')
#Get the AttributeList and text
attr_list, text, accel = pango.parse_markup( string )
attr_iter = attr_list.get_iterator()
#Create the converter
props = MarkupProps()
props.text = text
val = True
while val:
attrs = attr_iter.get_attrs()
for attr in attrs:
name = attr.type
start = attr.start_index
end = attr.end_index
name = pango.AttrType(name).value_nick
value = None
#Figure out which 'value' attribute to use...there's only one per pango.Attribute
for attr_value in attr_values:
if hasattr( attr, attr_value ):
value = getattr( attr, attr_value )
break
#There are some irregularities...'font_desc' of the pango.Attribute
#should be mapped to the 'font' property of a GtkTextTag
if name == 'font_desc':
name = 'font'
props.add( name, value, start, end )
val = attr_iter.next()
return props
此函数创建一个MarkupProps()对象，该对象能够生成GtkTextTags 以及文本中的索引以应用它们。
这是对象：
class MarkupProps():
'''
Stores properties that contain indices and appropriate values for that property.
Includes an iterator that generates GtkTextTags with the start and end indices to
apply them to
'''
def __init__(self):
'''
properties = ( {
'properties': {'foreground': 'green', 'background': 'red'}
'start': 0,
'end': 3
},
{
'properties': {'font': 'Lucida Sans 10'},
'start': 1,
'end':2,
},
)
'''
self.properties = []#Sequence containing all the properties, and values, organized by like start and end indices
self.text = ""#The raw text without any markup
def add( self, label, value, start, end ):
'''
Add a property to MarkupProps. If the start and end indices are already in
a property dictionary, then add the property:value entry into
that property, otherwise create a new one
'''
for prop in self.properties:
if prop['start'] == start and prop['end'] == end:
prop['properties'].update({label:value})
else:
new_prop = {
'properties': {label:value},
'start': start,
'end':end,
}
self.properties.append( new_prop )
def __iter__(self):
'''
Creates a GtkTextTag for each dict of properties
Yields (TextTag, start, end)
'''
for prop in self.properties:
tag = gtk.TextTag()
tag.set_properties( **prop['properties'] )
yield (tag, prop['start'], prop['end'])
因此，有了这个函数和MarkupProps对象，我可以给定一个 pango 标记字符串，将字符串分解为其属性和文本形式，然后将其转换为GtkTextTags。