Scrollable Text Box

import pygame
import pygame_gui

# Initialize Pygame
pygame.init()

# Set up the window
window_size = (800, 600)
window_surface = pygame.display.set_mode(window_size)
pygame.display.set_caption("Scrollable Text Box Example")

# Initialize UIManager
manager = pygame_gui.UIManager(window_size)

# Define the text box rectangle (position and size)
text_box_rect = pygame.Rect(100, 100, 400, 300)

# Create the text box with initial empty content
text_box = pygame_gui.elements.UITextBox(
    html_text="",
    relative_rect=text_box_rect,
    manager=manager
)

# Store text content as a list of lines
text_content = []


def append_text(new_text):
    text_content.append(new_text)
    # Join lines with <br> for HTML line breaks
    html_text = "<br>".join(text_content)
    text_box.html_text = html_text
    text_box.rebuild()  # Rebuild to update the text

    # Auto-scroll to the bottom
    if text_box.vertical_scroll_bar:
        # Set scroll position to the maximum
        text_box.vertical_scroll_bar.scroll_position = (
            text_box.vertical_scroll_bar.scrollable_height
        )


clock = pygame.time.Clock()
is_running = True

while is_running:
    time_delta = clock.tick(60) / 1000.0  # Limit to 60 FPS

    # Event handling
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            is_running = False

        # Pass events to pygame_gui
        manager.process_events(event)

        # Example: Append text when Enter is pressed
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RETURN:
                append_text("New message at the bottom!")

    # Update UI
    manager.update(time_delta)

    # Draw the UI
    window_surface.fill((255, 255, 255))  # White background
    manager.draw_ui(window_surface)
    pygame.display.update()

pygame.quit()