# forms.py
from django import forms
from .models import MyModel

class MyForm(forms.ModelForm):
  xxx = forms.ChoiceField(choices=[...], widget=forms.RadioSelect())

  class Meta:
    model = MyModel
    fields = ['id', 'xxx']


# admin.py
from django.contrib import admin
from .models import MyModel
from .forms import MyForm

class MyAdmin(admin.ModelAdmin):
  form = MyForm
  # ...省略若干代码

admin.site.register(MyModel, MyAdmin)

#coding: utf-8
from django import forms
from django.utils.html import format_html
from django.forms.utils import flatatt
from django.utils.encoding import force_text
from django.utils.safestring import mark_safe


ACE_RENDER = '''
<script src="/static/js/jquery-1.11.2.min.js"></script>
<script src="/static/js/ace/ace.js"></script>
<script>
  $(function () {
    var textarea = $('textarea');
    var editDiv = $('<div>', {
      position: 'absolute',
      width: textarea.width(),
      height: textarea.height(),
      'class': textarea.attr('class')
    }).insertBefore(textarea);

    textarea.css('display', 'none');

    var editor = ace.edit(editDiv[0]);
    editor.getSession().setValue(textarea.val());
    editor.getSession().setMode("ace/mode/%s");
    editor.setTheme("ace/theme/%s");

    textarea.closest('form').submit(function () {
      textarea.val(editor.getSession().getValue());
    });
  });
</script>
'''

class AceWidget(forms.Textarea):
  def __init__(self, mode="", theme="", attrs=None):
    '''
    为了能在调用的时候自定义代码类型和样式
    :param mode:
    :param theme:
    :param attrs:
    :return:
    '''
    super(AceWidget, self).__init__(attrs)
    self.mode = mode
    self.theme = theme

  def render(self, name, value, attrs=None):
    '''
    关键方法
    :param name:
    :param value:
    :param attrs:
    :return:
    '''
    if value is None:
      value = ''
    final_attrs = self.build_attrs(attrs, name=name)
    output = [format_html('<textarea{}>\r\n{}</textarea>', flatatt(final_attrs), force_text(value))]
    current_ace_render = ACE_RENDER %(self.mode, self.theme)
    output.append(current_ace_render)
    return mark_safe('\n'.join(output))

#coding: utf-8
from django import forms
from .models import Code
from widgets import AceWidget


class CodeForm(forms.ModelForm):
  code = forms.CharField(label='源码', widget=AceWidget(attrs={'cols': '100', 'rows': '20'}, mode="python", theme="monokai"))

  class Meta:
    model = Code
    fields = ['title', 'code']

#coding:utf-8
from django.db import models


class Code(models.Model):
  title = models.CharField('标题', max_length=50, unique=True)
  code = models.TextField('源码')

  class Meta:
    db_table = 'code'
    verbose_name = verbose_name_plural = '代码'

  def __unicode__(self):
    return self.title

from django.contrib import admin
from .models import Code
from .forms import CodeForm


class CodeAdmin(admin.ModelAdmin):
  form = CodeForm
  list_display = ['id', 'title']

admin.site.register(Code, CodeAdmin)