import os
import cairocffi
from . import base
from .. import bar
[docs]class Image(base._Widget, base.MarginMixin):
"""
Display a PNG image on the bar.
"""
defaults = [
("scale", True, "Enable/Disable image scaling"),
("filename", None, "PNG Image filename. Can contain '~'"),
]
def __init__(self, width=bar.CALCULATED, **config):
base._Widget.__init__(self, width, **config)
self.add_defaults(Image.defaults)
self.add_defaults(base.MarginMixin.defaults)
# make the default 0 instead
self._widget_defaults["margin"] = 0
def _configure(self, qtile, bar):
base._Widget._configure(self, qtile, bar)
if not self.filename:
raise ValueError("Filename not set!")
self.filename = os.path.expanduser(self.filename)
try:
self.image = cairocffi.ImageSurface.create_from_png(self.filename)
except MemoryError:
raise ValueError("The image '%s' doesn't seem to be a valid PNG"
% (self.filename))
self.pattern = cairocffi.SurfacePattern(self.image)
self.image_width = self.image.get_width()
self.image_height = self.image.get_height()
if self.scale:
new_height = self.bar.height - (self.margin_y * 2)
if new_height and self.image_height != new_height:
scaler = cairocffi.Matrix()
sp = self.image_height / float(new_height)
self.image_height = new_height
self.image_width = int(self.image_width / sp)
scaler.scale(sp, sp)
self.pattern.set_matrix(scaler)
def draw(self):
self.drawer.clear(self.bar.background)
self.drawer.ctx.save()
self.drawer.ctx.translate(self.margin_x, self.margin_y)
self.drawer.ctx.set_source(self.pattern)
self.drawer.ctx.paint()
self.drawer.ctx.restore()
self.drawer.draw(self.offset, self.width)
def calculate_width(self):
return self.image_width + (self.margin_x * 2)