added forms.py

program/forms.py

+from django import forms
+from django.core.files.images import get_image_dimensions
+
+from program.models import MusicFocus, ShowInformation, ShowTopic
+
+class FormWithButton(forms.ModelForm):
+    def clean_button(self):
+        button = self.cleaned_data.get('button')
+        if button:
+            width, height = get_image_dimensions(button)
+            if width != 11 or height != 11:
+                raise forms.ValidationError("width or height is not 11, (11x11)")
+        return button
+
+    def clean_button_hover(self):
+        button_hover = self.cleaned_data.get('button_hover')
+        if button_hover:
+            width, height = get_image_dimensions(button_hover)
+            if width != 11 or height != 11:
+                raise forms.ValidationError("width or height is not 11, (11x11)")
+        return button_hover
+
+    def clean_big_button(self):
+        big_button = self.cleaned_data.get('big_button')
+        if big_button:
+            width, height = get_image_dimensions(big_button)
+            if width != 17 or height != 17:
+                raise forms.ValidationError("width or height is not 17, (17x17)")
+        return big_button
+
+class MusicFocusForm(FormWithButton):
+    class Meta:
+        model = MusicFocus
+
+class ShowInformationForm(FormWithButton):
+    class Meta:
+        model = ShowInformation
+
+class ShowTopicForm(FormWithButton):
+    class Meta:
+        model = ShowTopic
+