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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 QBasicTimer, Property
from PySide6.QtGui import QColor, QFontMetrics, QPainter, QPalette
from PySide6.QtWidgets import QWidget
class WigglyWidget(QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self._step = 0
self._text = ""
self.setBackgroundRole(QPalette.Midlight)
self.setAutoFillBackground(True)
new_font = self.font()
new_font.setPointSize(new_font.pointSize() + 20)
self.setFont(new_font)
self._timer = QBasicTimer()
def isRunning(self):
return self._timer.isActive()
def setRunning(self, r):
if r == self.isRunning():
return
if r:
self._timer.start(60, self)
else:
self._timer.stop()
def paintEvent(self, event):
if not self._text:
return
sineTable = [0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100,
-92, -71, -38]
metrics = QFontMetrics(self.font())
x = (self.width() - metrics.horizontalAdvance(self.text)) / 2
y = (self.height() + metrics.ascent() - metrics.descent()) / 2
color = QColor()
with QPainter(self) as painter:
for i in range(len(self.text)):
index = (self._step + i) % 16
color.setHsv((15 - index) * 16, 255, 191)
painter.setPen(color)
dy = (sineTable[index] * metrics.height()) / 400
c = self._text[i]
painter.drawText(x, y - dy, str(c))
x += metrics.horizontalAdvance(c)
def timerEvent(self, event):
if event.timerId() == self._timer.timerId():
self._step += 1
self.update()
else:
QWidget.timerEvent(event)
def text(self):
return self._text
def setText(self, text):
self._text = text
running = Property(bool, isRunning, setRunning)
text = Property(str, text, setText)
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