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ClassesTable

Introduction

ClassesTable widget in Supervisely allows users to display all classes from given project in a table format. The widget shows the class name, geometry type, and the number of images and labels associated with each class. With ClassesTable widget, users can enable multi-selection mode, restrict the display of certain geometry types, and manage the selected classes. Users can customize the appearance and behavior of the widget to match their project requirements. ClassesTable widget also allows users to retrieve a list of the selected classes from the code. Overall, the ClassesTable widget is a valuable tool for organizing and managing the classes in Supervisely apps.

Function signature

ClassesTable(
    project_meta=None,
    project_id=None,
    project_fs=None,
    allowed_types=None,
    selectable=True,
    disabled=False,
    widget_id=None,
)

Parameters

Parameters
Type
Description

project_meta

ProjectMeta

Input ProjectMeta

project_id

int

Input Supervisely project ID

project_fs

Project

Input Project

allowed_types

List[Geometry]

Geometry types that will be display from all types in given project

selectable

bool

Whether the component is selectable

disabled

bool

Whether the component is disabled

widget_id

str

ID of the widget

project_meta

Determine input ProjectMeta.

type: ProjectMeta

default value: None

meta_json = api.project.get_meta(id=project_id)
meta = sly.ProjectMeta.from_json(data=meta_json)
classes_table = ClassesTable(project_meta=meta)

If you initialize the ClassesTable widget without providing one of the project_id or project_fs parameters, the "images count" and "labels count" columns in the table will be hidden. If you need to display information about the number of images and labels for each class, make sure to pass the appropriate project_id or project_fs object when initializing the widget.

project_id

Determine input project ID.

type: int

default value: None

classes_table = ClassesTable(project_id=project_id)

project_fs

Determine input Project, located on local host.

type: Project

default value: None

project_path = "/home/admin/work/supervisely/projects/lemons_annotated"
project = sly.Project(project_path, sly.OpenMode.READ)
classes_table = ClassesTable(project_fs=project)

allowed_types

Determine Geometry types that will be display from all types in given project.

type: List[Geometry]

default value: None

classes_table = ClassesTable(
    project_id=project_id,
    allowed_types=[sly.Polygon],
)

selectable

Determine whether the component is selectable.

type: bool

default value: True

classes_table = ClassesTable(
    project_id=project_id,
    selectable=False,
)

disabled

Determine whether the component is disabled.

type: bool

default value: False

classes_table = ClassesTable(
    project_id=project_id,
    disabled=True,
)

widget_id

ID of the widget.

type: str

default value: None

Methods and attributes

Attributes and Methods
Description

read_meta(project_meta: sly.ProjectMeta)

Read given ProjectMeta.

read_project(project_fs: sly.Project)

Read given Project.

read_project_from_id(project_id: int)

Read given Project by ID.

get_selected_classes()

Return list of selected classes.

select_classes()

Given classes will be selected (checked) in `ClassesTable``.

clear_selection()

Clear selected data.

value_changed()

Decorator function is handled when input value is changed.

loading(value: bool)

Decorator function is handled when input value is uplouding.

Mini App Example

You can find this example in our Github repository:

ui-widgets-demos/tables/004_classes_table/src/main.py

Import libraries

import os
from dotenv import load_dotenv
import supervisely as sly
from supervisely.app.widgets import Container, ClassesTable, Text, Card

Init API client

First, we load environment variables with credentials and init API for communicating with Supervisely Instance:

load_dotenv("local.env")
load_dotenv(os.path.expanduser("~/supervisely.env"))

api = sly.Api()

Initialize ClassesTable widget by project ID

project_id = sly.env.project_id()
class_table = ClassesTable(project_id=project_id)
label = Text("")

Initialize ClassesTable widget by local project

data_dir = sly.app.get_data_dir() # create local directory
if sly.fs.dir_exists(data_dir):
    sly.fs.clean_dir(data_dir) # clean directory

project_dir = os.path.join(data_dir, "sly_project")
sly.Project.download(api, project_id, project_dir)
project = sly.Project(project_dir, sly.OpenMode.READ)
local_class_table = ClassesTable(project_fs=project)
local_label = Text("")

Create app layout

Prepare a layout for app using Card widget with the content parameter and place widget that we've just created in the Container widget.

card = Card(
    title="Classes Table",
    content=Container([class_table, label], gap=5),
)
card_local = Card(
    title="Classes Table Local",
    content=Container([local_class_table, local_label], gap=5),
)

layout = Container(widgets=[card, card_local])

Create app using layout

Create an app object with layout parameter.

app = sly.Application(layout=layout)

Handle ClassesTable clicks

Use the decorator as shown below to handle ClassesTable clicks.

@class_table.value_changed
def class_table_value_changed(selected_classes):
    label.text = f"Selected classes: {', '.join(selected_classes)}"


@local_class_table.value_changed
def class_table_value_changed(selected_classes):
    local_label.text = f"Selected classes: {', '.join(selected_classes)}"
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