Reading text from user in Python Arcade library

Question

Is there a way in Python Arcade library to read text from the user (with textbox rectangle, or popup, etc.)? Without the need to read each key, and interpereting it (and translate to some other char if the system language isn't English).

If not, is there built-in way to check what is the correct character for the pressed key (depends to the system language and Caps Lock state, etc)?

I found just ways to write texts, but not to read them.

score 1 · Answer 1 · answered Feb 17 '22 at 10:11

I don't see such functionality in Arcade.

The only way is to build your own. Simple example:

import arcade

class Game(arcade.Window):
    def __init__(self):
        super().__init__(400, 300)
        self.text = ''

    def on_draw(self):
        arcade.start_render()
        arcade.draw_text(self.text, 200, 150, arcade.color.GREEN, 24, anchor_x='center')

    def on_key_press(self, key, key_modifiers):
        self.text += chr(key)

Game()
arcade.run()

hc_dev · Accepted Answer · 2022-02-17T21:49:29.303

From most tutorials, the Python Arcade Library has only basic key-event handling implemented, like on_key_press and on_key_release.

UI components for text I/O

However, the Python Arcade Library has GUI components as one of the major feature differences when compared to PyGame.

When searching the docs for input we can find a class

arcade.gui.UIInputText

An input field the user can type text into.

This seems to be since version 2.6.0 (see release notes).

Note: There is currently an open issue #1059: UIInputText() not working. (Could reproduce with arcade-2.6.7; but got it working by passing text to the constructor like UIInputText(text='hello')).

Example demonstrating text-input

I adapted it from the sample-code attached to the issue #1059. Added some event-handling as shown in Arcade Library's docs: FlatButton example.

import arcade
import arcade.gui as gui

# --- Method 1 for handling click events,
# Create a child class.
class QuitButton(arcade.gui.UIFlatButton):
    def on_click(self, event: arcade.gui.UIOnClickEvent):
        arcade.exit()

class MyWindow(arcade.Window):
    def __init__(self):
        super().__init__(400, 300, "UI Example", resizable=True)
        self.manager = gui.UIManager()
        self.manager.enable()

        arcade.set_background_color(arcade.color.BEIGE)
        
        # Create a text label
        self.label = arcade.gui.UILabel(
            text="look here for change",
            text_color=arcade.color.DARK_RED,
            width=350,
            height=40,
            font_size=24,
            font_name="Kenney Future")

        # Create an text input field
        self.input_field = gui.UIInputText(
          color=arcade.color.DARK_BLUE_GRAY,
          font_size=24,
          width=200,
          text='Hello ..')

        # Create a button
        submit_button = gui.UIFlatButton(
          color=arcade.color.DARK_BLUE_GRAY,
          text='Submit')
        # --- Method 2 for handling click events,
        # assign self.on_click_start as callback
        submit_button.on_click = self.on_click 
        
        self.v_box = gui.UIBoxLayout()
        self.v_box.add(self.label.with_space_around(bottom=0))
        self.v_box.add(self.input_field)
        self.v_box.add(submit_button)
        self.v_box.add(QuitButton(text="Quit"))
        
        self.manager.add(
            arcade.gui.UIAnchorWidget(
                anchor_x="center_x",
                anchor_y="center_y",
                child=self.v_box)
        )


    def update_text(self):
        print(f"updating the label with input text '{self.input_field.text}'")
        self.label.text = self.input_field.text    

    def on_click(self, event):
        print(f"click-event caught: {event}")
        self.update_text()

        
    def on_draw(self):
        arcade.start_render()
        self.manager.draw()


window = MyWindow()
arcade.run()

Reading text from user in Python Arcade library

2 Answers2

UI components for text I/O

Example demonstrating text-input

See also