Trouble performing actions using NavigationView

seriph

I am unable to use button actions on a table view, all within a subview using NavigationView. I would like to be able to click a button on the subview and have it manipulate the table view, but even trying to print the contents of objects in the subview isn't working, as shown below. I expect I am simply referencing the variables the wrong way, but I have not been able to get through this impasse. I get errors shown as comments in the code below.

To create the example below, I use two pyui files which I have summarized. If there is a way to share the pyui files in the forum, let me know. I tried embedding the json for the pyui as a string, but that didn't work. And I am sorry the example code is so complicated. I am happy to provide clarification.

import ui

# rootView.pyui contents:
# Text Field: name = displayString, action = none
# Button: name = displayButton, action = self.bt_display
# Table View: name = rootviewListTable

# subView.pyui contents:
# Text Field: name = svDisplayString, action = none
# Button: name = svDisplayButton, action = self.bt_svDisplay
# Button: name = attributesButton, action = self.bt_attributes
# Table View: name = svText

def make_button_item(action, image_name):
    return ui.ButtonItem(action=action, image=ui.Image.named(image_name))

class navviewManager(ui.View):

        def __init__(self):
                self.currentSongTitle = ""
                self.root_view = ui.load_view("rootView.pyui")
                self.root_view.left_button_items = [
                        make_button_item(self.bt_close, "ionicons-close-24")
                ]
                self.root_view.right_button_items = [
                        make_button_item(self.bt_subview, "ionicons-arrow-right-b-24")
                ]
                self.nav_view = ui.NavigationView(self.root_view)
                self.nav_view.present(hide_title_bar=True)
                
        def bt_subview(self, sender):
                sub_view = load_view("subView.pyui")
                sub_view.name = "subview"
                myText = "This is myText"
                myList = ui.ListDataSource(myText)
                myTextTable= sub_view["svText"]
                myTextTable.data_source = myTextTable.delegate = myList
                myTextTable.data_source.delete_enabled = myTextTable.editing = False
                self.nav_view.push_view(sub_view)

        def bt_display(self, sender):
                displayTerm = self.root_view["displayString"].text
                myList = ui.ListDataSource(displayTerm)
                
                myRootListTable = self.root_view["rootviewListTable"]
                myRootListTable.data_source = myRootListTable.delegate = myList
                myRootListTable.data_source.delete_enabled = myRootListTable.editing = False
                myRootListTable.reload_data()
                
        def bt_svDisplay(self, sender):
                svDisplayTerm = self.nav_view["svDisplayString"].text
                # AttributeError: 'NoneType' object has no attribute 'text'
                myList = ui.ListDataSource(svDisplayTerm)
                
                svListTable = self.nav_view["svText"]
                svListTable.data_source = svListTable.delegate = myList
                svListTable.data_source.delete_enabled = svListTable.editing = False
                svListTable.reload_data()
        
        def bt_attributes(self, sender):
                print(self.root_view["displayString"].text)  # OK
                print(vars(self.root_view["displayString"])) # OK
                print(vars(self.nav_view["svDisplayString"]))
                # TypeError: vars() argument must have __dict__ attribute

        def bt_close(self, sender):
            self.nav_view.close()
                         
manager = navviewManager()

ccc

Rename the .pyui file and change the extension from .pyui to .json and the file becomes readable as text. Change the file extension back to .pyui and it becomes a UI again.

cvp

@seriph at least error in

                sub_view = load_view("subView.pyui")

Need's to be ui.load_view...

cvp

@seriph you should read this topic to understand that there is no automatic way to know which view is currently presented in the NavigationView.

But self.nav_view is not the ui.View you want

seriph

Thank you, @ccc and @cvp for the helpful replies. I reviewed the reference @cvp suggested and it clear that NavigationView isn't the best tool for what I want to do: a program that displays the chords and lyrics from ChordPro files with the correct formatting and autoscrolling, including a scrollable list of the .chordpro files and a scrollable list of songs they contain.

I was able to repurpose a single TableView to handle all of this, which saved me from the complexity of working with NavigationView. I plan to try out the script in a guitar jam next month.

shahan67

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Taranve73013446

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