fileUploadAndBrowsing.rst

File Upload

Defining file upload method

First, we add argument to the button we defined in the previous section.

gui.button(self.controlArea, self, label="Load image", callback=self.browse_file)

Then we define our method for browsing files, because we will use QFileDialog, we import

from AnyQt.QtWidgets import QFileDialog

def browse_file(self):
filename, _ = QFileDialog.getOpenFileName(
    self, 'Open File', '', 'Image Files (*.gif *.jpg *.jpeg *.png *.svg);;All Files (*)'
)
if filename is None:
    return

self.filename = filename
self.load_image()

Defining load file method

Here we use NumPy, os and Output. So we add this imports:

import os
import numpy as np
from Orange.widgets.widget import Output

def load_image(self):
if self.filename is None:
    self.label.setText("No file selected")
    img = None
else:
    path = os.path.split(self.filename)
    name = path[1]
    self.label.setText(name)
    img = np.array(Image.open(self.filename))

self.Outputs.image.send(img)

Output

In the previous method we used Outputs to send our image, but we yet have to implement Outputs. Directly under metadata we define:

class Outputs:
    image = Output("image", np.ndarray, default=True)

Setting

We need to use Setting, which will save file, so when we close Orange, the workflow will still remember the file, when we open Orange again. Under and outside class Outputs, we use:

filename = Setting(None)

Resizing

Till now, our window had resizing enabled. But it's better to disable this, we need to set

resizing_enabled = False

Result

After we run orange-canvas, we see our final result when we place our widget on the canvas and click on it.

Before upload

After upload

Warning

⚠️ But if you check console from where we opened Orange, we get UserWarning.

We need to implement summarize.

.. seealso::
   - 🔍 :doc:`summarize`