dswidgets

Features

dswidgets is a collection of panel derived widgets commonly used in airborne datasytems.

Current Widget list:

Widgets to be added:

Controls

System Info

Install

pip install dswidgets

Install during development

pip install -e .

Imports

import panel as pn
import sys

sys.path

['/home/jovyan/work/github-projects/dswidgets/nbs',
 '/opt/conda/lib/python311.zip',
 '/opt/conda/lib/python3.11',
 '/opt/conda/lib/python3.11/lib-dynload',
 '',
 '/opt/conda/lib/python3.11/site-packages',
 '/home/jovyan/work/github-projects/nbdev_learn']

Be sure to install dswidgets via make install, make dev-install

import dswidgets as ds

dir(ds)

['Buttons',
 'FileSystem',
 '__all__',
 '__builtins__',
 '__cached__',
 '__doc__',
 '__file__',
 '__loader__',
 '__name__',
 '__package__',
 '__path__',
 '__spec__',
 '__version__',
 'dswidgets']

We need to load the panel extension so we can view the widgets in the notebook output. The floatpanel parameter is required to show the FileBroswer in a floating pop-up widget.

pn.extension('floatpanel')

Unable to display output for mime type(s): application/javascript, application/vnd.holoviews_load.v0+json

Unable to display output for mime type(s): application/javascript, application/vnd.holoviews_load.v0+json

Below are some of the variables we can access.

print(f' __version__ = {ds.__version__}\n'
      f'__package__ = {ds.__package__}\n'
      f'File = {ds.__file__}')

 __version__ = 0.0.3
__package__ = dswidgets
File = /opt/conda/lib/python3.11/site-packages/dswidgets/__init__.py

The Toggle Button

b = ds.Buttons.Toggle()
b.button

b.value

1

The Toggle Button with a callback

def button_changed(v):
  debug_w.value = v
  #print(v)
debug_w = pn.widgets.StaticText(
  name="Debug_w.value:", 
  value = 'Push the button to set this value.')
b2 = ds.Buttons.Toggle(id='b2_id', change_cb = button_changed )
w = pn.Row(b2.button, debug_w)
w.servable()

b2.value

0

The Toggle() button contains an ‘id’ element that you can

b2.id

'b2_id'

FileSystem.Folder_Button()

Folder_Button creates a button that triggers a pop-up Folder-Selector widget allowing the user to select a folder on the server system. Once the folder is selected, a user defined call back function is called with the selected folder as a parameter.

Below we define a call back cb() which will be called with the string value of the selected folder, and then create the Folder_Button. Click the Folder button to trigger the Folder_Selector dialog.

def cb(v):
  print(f'{v=} ')

Fsb = ds.FileSystem.Folder_Button( name = "Folder",  call_back=cb )
Fsb.folder_button

After you select a folder, the result will also be in Fsb.value.

Fsb.value

'/proc/37987'

System_Status_widget()

This widget provides a snapshot of the CPU utilization for each core RAM utilization, disk drive information at a user specified interval. The widget starts a thread which automatically updates widget values.

Below is instantiate the widget which also starts the internal thread which updates the widget.

cw = ds.FileSystem.CPU_WIDGET()
cw.cpu_status_widget.servable()

None

For debugging, you can check the status of the widget with show_status().

cw.show_status()

      Thread Name                         Run  Alive    Loops  Interval
Thread-5 (system_status_thread)          True   True        4   1.0 Sec

You can also change the visibilty of the widget. Let’s hide it.

cw.cpu_status_widget.visible = False

Now lets redisplay it.

cw.cpu_status_widget.visible = True
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