PYGLET – On Layout Update Event for Incremental Text Layout
In this article we will see how we can get the position on line in incremental text layout object 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. It get triggered due to text reflow. Text reflow is caused by document edits or changes to the layout’s size. Changes to the layout’s position or active selection, and certain document edits such as text color, do not cause a reflow.
We can create a window and incremental text layout with the help of commands given below
# creating a window window = pyglet.window.Window(width, height, title) # creating a in layout = pyglet.text.layout.IncrementalTextLayout(document, width, height)
Below is the syntax of the layout update event
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# layout update event @window.event def on_layout_update(): # printing text print("Layout update Event")
Below is the implementation