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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from __future__ import annotations
from PySide6.QtCore import QRect
from PySide6.QtGui import QPainter
from PySide6.QtWidgets import QGraphicsBlurEffect
class BlurEffect(QGraphicsBlurEffect):
def __init__(self, item):
super().__init__()
self._base_line = 200
self._item = item
def adjust_for_item(self):
y = self._base_line - self._item.pos().y()
# radius = qBound(qreal(0.0), y / 32, qreal(16.0)); which is equivalent to
radius = max(0, min(y / 32, 16))
self.setBlurRadius(radius)
def set_base_line(self, base_line):
self._base_line = base_line
def boundingRect(self) -> QRect:
self.adjust_for_item()
return super().boundingRect()
def draw(self, painter: QPainter):
self.adjust_for_item()
super().draw(painter)
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