Image View in Box

[KyucraftV2]

Describe the bug

When you create an image_view, put this in a Box and put this box in main_window. The image doesnt appear.
I have this code :

#Testing add image
self.box1 = toga.Box(style=Pack(direction=COLUMN))
image = toga.Image(r"resources\img.png")
image_view = toga.ImageView(id='view1', image=image)
self.box1.add(image_view)
self.mainBox.add(self.box1)

#Create the main window
self.main_window = toga.MainWindow(title=self.formal_name)
self.main_window.content = self.mainBox
self.main_window.show()

But if on the line self.mainBox.add(self.box1), I have self.mainBox.add(image_view), the image appear

Steps to reproduce

1. Use the code
2. Run the app
3. See the image doesnt appear

Expected behavior

Normally the image needs to appear when its in a box like if the image is not in box.

Screenshots

No response

Environment

• Operating System: Windows
• Python version: 3.8
• Software versions:
  • Briefcase: 0.3.14
  • Toga: 0.3.1

Logs

Additional context

No response

[freakboy3742]

Thanks for the report.

I'm fairly certain this will turn out to be a layout issue. Image is a weird widget at present in that it doesn't enforce a minimum size constraint, so I suspect what is happening here is that the Image is collapsing to 0 size. I think the immediate workaround will be to add a fixed height and width (or a flex=1) to the style definition for the image; the longer term fix will be to ensure that there's a default intrinsic size derived by the size of the image itself.

[KyucraftV2]

Okey thanks a lot, when i fix the height and width it works, but with the flex=1 it doesnt work