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from rich.segment import Segment
from rich.style import Style
from textual.app import App, ComposeResult
from textual.strip import Strip
from textual.widget import Widget
class CheckerBoard(Widget):
"""Render an 8x8 checkerboard."""
def render_line(self, y: int) -> Strip:
"""Render a line of the widget. y is relative to the top of the widget."""
row_index = y // 4 # A checkerboard square consists of 4 rows
if row_index >= 8: # Generate blank lines when we reach the end
return Strip.blank(self.size.width)
is_odd = row_index % 2 # Used to alternate the starting square on each row
white = Style.parse("on white") # Get a style object for a white background
black = Style.parse("on black") # Get a style object for a black background
# Generate a list of segments with alternating black and white space characters
segments = [
Segment(" " * 8, black if (column + is_odd) % 2 else white)
for column in range(8)
]
strip = Strip(segments, 8 * 8)
return strip
class BoardApp(App):
"""A simple app to show our widget."""
def compose(self) -> ComposeResult:
yield CheckerBoard()
if __name__ == "__main__":
app = BoardApp()
app.run()
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