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import sys
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from PyQt5.QtCore import Qt, QTimer
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from PyQt5.QtGui import QFont, QFontMetrics, QPainter,QPixmap
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from PyQt5.QtWidgets import QApplication, QLabel, QWidget
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class ScrollTextWindow(QWidget):
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    """ 滚动字幕 """
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    def __init__(self, songName, songerName, parent=None):
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        super().__init__(parent)
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        self.songName = songName
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        self.songerName = songerName
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        # 实例化定时器
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        self.timer = QTimer(self)
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        # 设置刷新时间和移动距离
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        self.timeStep = 20
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        self.moveStep = 1
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        self.songCurrentIndex = 0
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        self.songerCurrentIndex = 0
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        # 设置字符串溢出标志位
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        self.isSongNameAllOut = False
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        self.isSongerNameAllOut = False
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        # 设置两段字符串之间留白的宽度
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        self.spacing = 25
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        # 初始化界面
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        self.initWidget()
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    def initWidget(self):
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        """ 初始化界面 """
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        self.setFixedHeight(115)
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        self.setAttribute(Qt.WA_StyledBackground)
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        # 调整窗口宽度
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        self.adjustWindowWidth()
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        # 初始化定时器
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        self.timer.setInterval(self.timeStep)
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        self.timer.timeout.connect(self.updateIndex)
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        # 只要有一个字符串宽度大于窗口宽度就开启滚动：
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        if self.isSongerNameTooLong or self.isSongNameTooLong:
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            self.timer.start()
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    def getTextWidth(self):
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        """ 计算文本的总宽度 """
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        songFontMetrics = QFontMetrics(QFont('Microsoft YaHei', 14, 400))
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        self.songNameWidth = songFontMetrics.width(self.songName)
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        songerFontMetrics = QFontMetrics(QFont('Microsoft YaHei', 12, 500))
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        self.songerNameWidth = songerFontMetrics.width(self.songerName)
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    def adjustWindowWidth(self):
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        """ 根据字符串长度调整窗口宽度 """
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        self.getTextWidth()
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        maxWidth = max(self.songNameWidth, self.songerNameWidth)
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        # 判断是否有字符串宽度超过窗口的最大宽度
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        self.isSongNameTooLong = self.songNameWidth > 250
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        self.isSongerNameTooLong = self.songerNameWidth > 250
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        # 设置窗口的宽度
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        self.setFixedWidth(min(maxWidth, 250))
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    def updateIndex(self):
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        """ 更新下标 """
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        self.update()
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        self.songCurrentIndex += 1
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        self.songerCurrentIndex += 1
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        # 设置下标重置条件
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        resetSongIndexCond = self.songCurrentIndex * \
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            self.moveStep >= self.songNameWidth + self.spacing * self.isSongNameAllOut
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        resetSongerIndexCond = self.songerCurrentIndex * \
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            self.moveStep >= self.songerNameWidth + self.spacing * self.isSongerNameAllOut
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        # 只要条件满足就要重置下标并将字符串溢出置位，保证在字符串溢出后不会因为留出的空白而发生跳变
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        if resetSongIndexCond:
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            self.songCurrentIndex = 0
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            self.isSongNameAllOut = True
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        if resetSongerIndexCond:
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            self.songerCurrentIndex = 0
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            self.isSongerNameAllOut = True
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    def paintEvent(self, e):
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        """ 绘制文本 """
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        # super().paintEvent(e)
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        painter = QPainter(self)
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        painter.setPen(Qt.white)
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        # 绘制歌名
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        painter.setFont(QFont('Microsoft YaHei', 14))
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        if self.isSongNameTooLong:
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            # 实际上绘制了两段完整的字符串
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            # 从负的横坐标开始绘制第一段字符串
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            painter.drawText(self.spacing * self.isSongNameAllOut - self.moveStep *
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                             self.songCurrentIndex, 54, self.songName)
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            # 绘制第二段字符串
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            painter.drawText(self.songNameWidth - self.moveStep * self.songCurrentIndex +
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                             self.spacing * (1 + self.isSongNameAllOut), 54, self.songName)
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        else:
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            painter.drawText(0, 54, self.songName)
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        # 绘制歌手名
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        painter.setFont(QFont('Microsoft YaHei', 12, 500))
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        if self.isSongerNameTooLong:
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            painter.drawText(self.spacing * self.isSongerNameAllOut - self.moveStep *
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                             self.songerCurrentIndex, 82, self.songerName)
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            painter.drawText(self.songerNameWidth - self.moveStep * self.songerCurrentIndex +
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                             self.spacing * (1 + self.isSongerNameAllOut), 82, self.songerName)
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        else:
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            painter.drawText(0, 82, self.songerName)

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class SongInfoCard(QWidget):
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    """ 播放栏左侧歌曲信息卡 """
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    def __init__(self, songInfo: dict, parent=None):
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        super().__init__(parent)
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        # 保存信息
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        self.songInfo = songInfo
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        self.songName = self.songInfo['songName']
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        self.songerName = self.songInfo['songer']
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        # 实例化小部件
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        self.albumPic = QLabel(self)
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        self.scrollTextWindow = ScrollTextWindow(
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            self.songName, self.songerName, self)
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        # 初始化界面
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        self.initWidget()
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    def initWidget(self):
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        """ 初始化小部件 """
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        self.setFixedHeight(115)
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        self.setFixedWidth(115 + 15 + self.scrollTextWindow.width() + 25)
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        self.setAttribute(Qt.WA_StyledBackground)
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        self.setWindowFlags(Qt.FramelessWindowHint)
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        self.scrollTextWindow.move(130, 0)
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        self.albumPic.setPixmap(QPixmap(self.songInfo['album'][-1]).scaled(
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                                115, 115, Qt.KeepAspectRatio, Qt.SmoothTransformation))
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if __name__ == "__main__":
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    app = QApplication(sys.argv)
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    songInfo = {
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        'songName': 'ハッピーでバッドな眠りは浅い', 'songer': '鎖那',
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        'album': [r'resource\Album Cover\ハッピーでバッドな眠りは浅い\ハッピーでバッドな眠りは浅い.png']}
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    demo = SongInfoCard(songInfo)
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    demo.setStyleSheet('background:rgb(129,133,137)')
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    demo.show()
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    sys.exit(app.exec_())