gas/gas_settings.py

@@ -20,3 +20,5 @@ MEDIA = getattr(settings, 'GAS_MEDIA', {
 })
 
 EXTRA_MEDIA = getattr(settings, 'GAS_EXTRA_MEDIA', None)
+
+IMAGE_PREVIEW_WIDTH = getattr(settings, 'IMAGE_PREVIEW_WIDTH', 240)

gas/static/gas/css/gas.css

@@ -262,3 +262,7 @@ label {
     width: 20em;
     padding: 1em;
 }
+
+.preview {
+    display: block;
+}

gas/templates/gas/tags/widgets/image_preview.html

@@ -0,0 +1,5 @@
+{% if widget.is_initial %}{{ widget.initial_text }}: <a href="{{ widget.value.url }}"><img src="{{ widget.value.url }}" width="{{ widget.attrs.IMAGE_PREVIEW_WIDTH }}" class="preview" /></a>{% if not widget.required %}
+<input type="checkbox" name="{{ widget.checkbox_name }}" id="{{ widget.checkbox_id }}"{% if widget.attrs.disabled %} disabled{% endif %}>
+<label for="{{ widget.checkbox_id }}">{{ widget.clear_checkbox_label }}</label>{% endif %}<br>
+{{ widget.input_text }}:{% endif %}
+<input type="{{ widget.type }}" name="{{ widget.name }}"{% include "django/forms/widgets/attrs.html" %}>

gas/templatetags/form_tags.py

@@ -1,7 +1,8 @@
-from django import forms
-from django import template
+from django import forms, template
 from django.template.loader import render_to_string
 
+from ..gas_settings import IMAGE_PREVIEW_WIDTH
+
 register = template.Library()
 
 
@@ -19,6 +20,10 @@ def base_form_field(field, css=None, container_class='', add_another_url=None, f
     elif isinstance(field.field, forms.DateField):
         field.field.widget.input_type = 'date'
 
+    if isinstance(field.field, forms.ImageField):
+        field.field.widget.template_name = 'gas/tags/widgets/image_preview.html'
+        field.field.widget.attrs['IMAGE_PREVIEW_WIDTH'] = IMAGE_PREVIEW_WIDTH
+
     if isinstance(field.field, forms.SplitDateTimeField):
         field.field.widget.widgets[1].attrs['placeholder'] = '00:00:00'
     else: