Python libflow example

libflow-example-python.md

libflow example

import gi
gi.require_version('Gtk', '4.0')
gi.require_version('Flow', '1.0')
from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import Flow

def on_activate(app):
    win = Gtk.ApplicationWindow(application=app)
    nodeview = Flow.NodeView.new()
    
    menu_content = Gtk.Box.new(Gtk.Orientation.VERTICAL, 0)
    btn = Gtk.Button(label="Add node")
    btn.connect('clicked', lambda _: add_node(nodeview))
    menu_content.append(btn)
    nodeview.set_menu_content(menu_content)
    
    win.set_child(nodeview)
    win.present()

def add_node(nodeview):
    node = Flow.Node.new()
    node.set_label_name("Example Node", True)
    
    sink = Flow.Sink.with_type(float)
    sink.set_name("Input")
    
    sink_color = Gdk.RGBA()
    sink_color.parse("red")
    sink.set_color(sink_color)
    
    source = Flow.Source.with_type(float)
    source.set_name("Output")
    
    source_color = Gdk.RGBA()
    source_color.parse("green")
    source.set_color(source_color)
    
    node.add_sink(sink)
    node.add_source(source)
    node.set_content(Gtk.Button(label="Button"))
    
    nodeview.add(node)

app = Gtk.Application(application_id='com.example.GtkApplication')
app.connect('activate', on_activate)

app.run(None)