Is it possible to use a lambda function as a command parameter?

[AJ6CU]

Would like the command for a button to be something like "lambda: self.button_clicked(1)" Tried entering that directly and just get the read error box. When I selected 'send widget id', the actual command definition has no parameter and while the callback definition does, and python is not happy.

Thanks!

Mark

[alejandroautalan]

Hello @AJ6CU,

The designer does not allow you to enter python code in command properties, only methods or function names.

Some times you need only one callback to manage a group of widgets. In those cases you use the "Send widget id" option of the command.

An example:

#!/usr/bin/python3
import pathlib
import pygubu
PROJECT_PATH = pathlib.Path(__file__).parent
PROJECT_UI = PROJECT_PATH / "discussion164.ui"


class Discussion164App:
    def __init__(self, master=None):
        self.builder = builder = pygubu.Builder()
        builder.add_resource_path(PROJECT_PATH)
        builder.add_from_file(PROJECT_UI)
        # Main widget
        self.mainwindow = builder.get_object("toplevel1", master)
        builder.connect_callbacks(self)

    def run(self):
        self.mainwindow.mainloop()

    def on_button_clicked(self, widget_id):
        if widget_id == "action_a":
            print("Action A")
        elif widget_id == "action_b":
            print("Action B")
        else:
            print("Action C")


if __name__ == "__main__":
    app = Discussion164App()
    app.run()

discussion164.ui

<?xml version='1.0' encoding='utf-8'?>
<interface version="1.3">
  <object class="tk.Toplevel" id="toplevel1">
    <property name="height">200</property>
    <property name="title" translatable="yes">Actions Test</property>
    <property name="width">200</property>
    <child>
      <object class="ttk.Frame" id="frame1">
        <property name="height">200</property>
        <property name="padding">5</property>
        <property name="width">200</property>
        <layout manager="pack">
          <property name="side">top</property>
        </layout>
        <child>
          <object class="ttk.Button" id="action_a" named="True">
            <property name="command" type="command" cbtype="with_wid">on_button_clicked</property>
            <property name="text" translatable="yes">Action A</property>
            <layout manager="pack">
              <property name="side">top</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="ttk.Button" id="action_b" named="True">
            <property name="command" type="command" cbtype="with_wid">on_button_clicked</property>
            <property name="text" translatable="yes">Action B</property>
            <layout manager="pack">
              <property name="side">top</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="ttk.Button" id="action_c" named="True">
            <property name="command" type="command" cbtype="with_wid">on_button_clicked</property>
            <property name="text" translatable="yes">Action C</property>
            <layout manager="pack">
              <property name="side">top</property>
            </layout>
          </object>
        </child>
      </object>
    </child>
  </object>
</interface>

[AJ6CU]

Hi, When I select the custom widget object in code generation with the file you provided I get the error: C:\Users\markj\PycharmProjects\tkinkerscratch\venv\Scripts\python.exe C:/Users/markj/PycharmProjects/tkinkerscratch/validate.py Traceback (most recent call last): File "C:\Users\markj\PycharmProjects\tkinkerscratch\validate.py", line 87, in <module> widget.pack(expand=True, fill="both") AttributeError: 'TestWidget' object has no attribute 'pack' If I select Code Script it works. If I select application I get the error message: import pygubu ModuleNotFoundError: No module named 'pygubu' This latter one is probably because I messed up setting up the search path, so no worth tracking down. But what about the error message when selecting “custom widget”? Thanks Mark From: Alejandro Autalán ***@***.***> Sent: Saturday, November 19, 2022 10:43 AM To: alejandroautalan/pygubu-designer ***@***.***> Cc: AJ6CU ***@***.***>; Mention ***@***.***> Subject: Re: [alejandroautalan/pygubu-designer] Is it possible to use a lambda function as a command parameter? (Discussion #164) Hello @AJ6CU <https://github.com/AJ6CU> , The designer does not allow you to enter python code in command properties, only methods or function names. Some times you need only one callback to manage a group of widgets. In those cases you use the "Send widget id" option of the command. An example: <https://user-images.githubusercontent.com/3482471/202866342-b6500552-6d91-4b14-8c3d-c7f00dadabd0.png> #!/usr/bin/python3 import pathlib import pygubu PROJECT_PATH = pathlib.Path(__file__).parent PROJECT_UI = PROJECT_PATH / "discussion164.ui" class Discussion164App: def __init__(self, master=None): self.builder = builder = pygubu.Builder() builder.add_resource_path(PROJECT_PATH) builder.add_from_file(PROJECT_UI) # Main widget self.mainwindow = builder.get_object("toplevel1", master) builder.connect_callbacks(self) def run(self): self.mainwindow.mainloop() def on_button_clicked(self, widget_id): if widget_id == "action_a": print("Action A") elif widget_id == "action_b": print("Action B") else: print("Action C") if __name__ == "__main__": app = Discussion164App() app.run() discussion164.ui <?xml version='1.0' encoding='utf-8'?> <interface version="1.3"> <object class="tk.Toplevel" id="toplevel1"> <property name="height">200</property> <property name="title" translatable="yes">Actions Test</property> <property name="width">200</property> <child> <object class="ttk.Frame" id="frame1"> <property name="height">200</property> <property name="padding">5</property> <property name="width">200</property> <layout manager="pack"> <property name="side">top</property> </layout> <child> <object class="ttk.Button" id="action_a" named="True"> <property name="command" type="command" cbtype="with_wid">on_button_clicked</property> <property name="text" translatable="yes">Action A</property> <layout manager="pack"> <property name="side">top</property> </layout> </object> </child> <child> <object class="ttk.Button" id="action_b" named="True"> <property name="command" type="command" cbtype="with_wid">on_button_clicked</property> <property name="text" translatable="yes">Action B</property> <layout manager="pack"> <property name="side">top</property> </layout> </object> </child> <child> <object class="ttk.Button" id="action_c" named="True"> <property name="command" type="command" cbtype="with_wid">on_button_clicked</property> <property name="text" translatable="yes">Action C</property> <layout manager="pack"> <property name="side">top</property> </layout> </object> </child> </object> </child> </object> </interface> — Reply to this email directly, view it on GitHub <#164 (comment)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQXOXTFG4XV5XIHI3SVYV7DWJENTZANCNFSM6AAAAAASFCGLUY> . You are receiving this because you were mentioned. <https://github.com/notifications/beacon/AQXOXTBJTU7KUDPCKMRISEDWJENTZA5CNFSM6AAAAAASFCGLU2WGG33NNVSW45C7OR4XAZNRIRUXGY3VONZWS33OINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAH7OQG.gif> Message ID: ***@***.*** ***@***.***> >