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PYGLET – Incremental Text Layout
  • Last Updated : 23 Sep, 2020

In this article we will see how we can create a incremental text layout in PYGLET module in python. Pyglet is easy to use but powerful library for developing visually rich GUI applications like games, multimedia etc. A window is a “heavyweight” object occupying operating system resources. Windows may appear as floating regions or can be set to fill an entire screen (fullscreen). Incremental text layout displays text which is suitable for interactive editing and/or scrolling large documents. Unlike TextLayout and ScrollableTextLayout, this class generates vertex lists only for lines of text that are visible. As the document is scrolled, vertex lists are deleted and created as appropriate to keep video memory usage to a minimum and improve rendering speed.

We can create a window with the help of command given below

# creating a window
window = pyglet.window.Window(width, height, title)

In order to create window we use pyglet.text.document.UnformattedDocument( method

Syntax : pyglet.text.layout.IncrementalTextLayout(document, width, height)

Argument : It takes document object, width and height as required argument

Return : It returns IncrementalTextLayout object

Below is the implementation

# importing pyglet module
import pyglet
import pyglet.window.key
# width of window
width = 500
# height of window
height = 500
# caption i.e title of the window
title = "Geeksforgeeks"
# creating a window
window = pyglet.window.Window(width, height, title)
# text 
text = "GeeksforGeeks Learn and Grow, Portal for Geeks"
# batch object
batch =
# creating a formatted document
# unlike unformatted document it is formatted
document = pyglet.text.document.FormattedDocument(text)
# setting style to the document
document.set_style(0, len(document.text), dict(font_name ='Arial', font_size = 16, color =(255, 255, 255, 255)))
# creating a incremental text layout
layout = pyglet.text.layout.IncrementalTextLayout(document, 400, 350, multiline = True, batch = batch)
# creating a caret
caret = pyglet.text.caret.Caret(layout, color =(150, 255, 150))
# caret to winow push handlers
# setting caret style
caret.set_style(dict(font_name ="Arial"))
# on draw event
def on_draw():
    # clear the window
    # draw the batch
    # caret to winow push handlers
# key press event    
def on_key_press(symbol, modifier):
    # key "C" get press
    if symbol == pyglet.window.key.C:
        # closing the window
        # window.close()
# image for icon
img = pyglet.resource.image("gfg.png")
# setting image as icon
# start running the application

Output :

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