Here is a simple Enaml file to display a single image - an 800x1210 pixel image.
from enaml.widgets.api import Window, Container, ImageView
from enaml.image import Image
enamldef ImageViewResizeWindow(Window):
Container:
ImageView:
image << Image(data=open("Mona_Lisa.jpg", "rb").read())
scale_to_fit = True
allow_upscaling = False
preserve_aspect_ratio = True
The windows opens up rather large to fit the whole image in, but when I try to resize the window, it won't shrink - the image can't be downscaled, even though scale_to_fit is True. On the other hand, it will allow the window to be resized larger, but (correctly) won't upscale the image - it just adds more space around it.
Experimenting, I set allow_upscalingto True, and it allowed the image to grow, but not to shrink. It knows how to scale, but won't downscale.
Okay, maybe the ImageView must have a minimum size, so I added:
minimum_size = (100, 100)
That should override the "intelligent minimum size" that was calculated for the ImageView widget, but makes no difference.
I am new to Enaml, so I suspect a basic level misunderstanding.
What do I need to do to get an ImageView to allow the downscaling of a large image, when the surrounding window is resized?
Versions:
Setting resist_width and resist_height to 'weak' is the correct answer. You can set other constraints on the widget to give it a preferred size:
ImageView:
resist_width = 'weak'
resist_height = 'weak'
constraints = [(width == 640) | 'weak', (height == 480) | 'weak']