sqlalchemy: Merged revisions 3918 to 4053 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/sqlalchemy@4054 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 113 insertions, 0 deletions

diff --git a/django/newforms/widgets.py b/django/newforms/widgets.py
new file mode 100644
index 0000000000..5ec27653cf
--- /dev/null
+++ b/django/newforms/widgets.py
@@ -0,0 +1,113 @@
+"""
+HTML Widget classes
+"""
+
+__all__ = (
+    'Widget', 'TextInput', 'PasswordInput', 'HiddenInput', 'FileInput',
+    'Textarea', 'CheckboxInput',
+    'Select', 'SelectMultiple',
+)
+
+from django.utils.html import escape
+from itertools import chain
+
+try:
+    set # Only available in Python 2.4+
+except NameError:
+    from sets import Set as set # Python 2.3 fallback
+
+# Converts a dictionary to a single string with key="value", XML-style.
+# Assumes keys do not need to be XML-escaped.
+flatatt = lambda attrs: ' '.join(['%s="%s"' % (k, escape(v)) for k, v in attrs.items()])
+
+class Widget(object):
+    requires_data_list = False # Determines whether render()'s 'value' argument should be a list.
+    def __init__(self, attrs=None):
+        self.attrs = attrs or {}
+
+    def render(self, name, value):
+        raise NotImplementedError
+
+class Input(Widget):
+    "Base class for all <input> widgets (except type='checkbox', which is special)"
+    input_type = None # Subclasses must define this.
+    def render(self, name, value, attrs=None):
+        if value is None: value = ''
+        final_attrs = dict(self.attrs, type=self.input_type, name=name)
+        if attrs:
+            final_attrs.update(attrs)
+        if value != '': final_attrs['value'] = value # Only add the 'value' attribute if a value is non-empty.
+        return u'<input %s />' % flatatt(final_attrs)
+
+class TextInput(Input):
+    input_type = 'text'
+
+class PasswordInput(Input):
+    input_type = 'password'
+
+class HiddenInput(Input):
+    input_type = 'hidden'
+
+class FileInput(Input):
+    input_type = 'file'
+
+class Textarea(Widget):
+    def render(self, name, value, attrs=None):
+        if value is None: value = ''
+        final_attrs = dict(self.attrs, name=name)
+        if attrs:
+            final_attrs.update(attrs)
+        return u'<textarea %s>%s</textarea>' % (flatatt(final_attrs), escape(value))
+
+class CheckboxInput(Widget):
+    def render(self, name, value, attrs=None):
+        final_attrs = dict(self.attrs, type='checkbox', name=name)
+        if attrs:
+            final_attrs.update(attrs)
+        if value: final_attrs['checked'] = 'checked'
+        return u'<input %s />' % flatatt(final_attrs)
+
+class Select(Widget):
+    def __init__(self, attrs=None, choices=()):
+        # choices can be any iterable
+        self.attrs = attrs or {}
+        self.choices = choices
+
+    def render(self, name, value, attrs=None, choices=()):
+        if value is None: value = ''
+        final_attrs = dict(self.attrs, name=name)
+        if attrs:
+            final_attrs.update(attrs)
+        output = [u'<select %s>' % flatatt(final_attrs)]
+        str_value = str(value) # Normalize to string.
+        for option_value, option_label in chain(self.choices, choices):
+            selected_html = (str(option_value) == str_value) and ' selected="selected"' or ''
+            output.append(u'<option value="%s"%s>%s</option>' % (escape(option_value), selected_html, escape(option_label)))
+        output.append(u'</select>')
+        return u'\n'.join(output)
+
+class SelectMultiple(Widget):
+    requires_data_list = True
+    def __init__(self, attrs=None, choices=()):
+        # choices can be any iterable
+        self.attrs = attrs or {}
+        self.choices = choices
+
+    def render(self, name, value, attrs=None, choices=()):
+        if value is None: value = []
+        final_attrs = dict(self.attrs, name=name)
+        if attrs:
+            final_attrs.update(attrs)
+        output = [u'<select multiple="multiple" %s>' % flatatt(final_attrs)]
+        str_values = set([str(v) for v in value]) # Normalize to strings.
+        for option_value, option_label in chain(self.choices, choices):
+            selected_html = (str(option_value) in str_values) and ' selected="selected"' or ''
+            output.append(u'<option value="%s"%s>%s</option>' % (escape(option_value), selected_html, escape(option_label)))
+        output.append(u'</select>')
+        return u'\n'.join(output)
+
+class RadioSelect(Widget):
+    pass
+
+class CheckboxSelectMultiple(Widget):
+    pass