使 Pyqt 按钮在鼠标按下而不是鼠标按下时运行功能
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【中文标题】使 Pyqt 按钮在鼠标按下而不是鼠标按下时运行功能【英文标题】：Make Pyqt Button Run Function on Mouse Down Instead of Mouse Up 【发布时间】：2020-12-28 05:26:53 【问题描述】：我用pyqt5做了一个非常简单的钢琴卷。每个键都是一个按钮，并运行一个功能以在单击按钮时播放音符声音。但是，直到鼠标离开按钮时才会播放声音。有没有办法让它在鼠标按下按钮时立即运行该功能？
代码如下：
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QFileDialog
from pydub import Audiosegment
from pydub.playback import play
import threading
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(450, 210)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.c1 = QtWidgets.QPushButton(self.centralwidget)
self.c1.setGeometry(QtCore.QRect(0, 70, 31, 111))
self.c1.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.c1.setText("")
self.c1.setObjectName("c1")
self.d1 = QtWidgets.QPushButton(self.centralwidget)
self.d1.setGeometry(QtCore.QRect(30, 70, 31, 111))
self.d1.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.d1.setText("")
self.d1.setObjectName("d1")
self.e1 = QtWidgets.QPushButton(self.centralwidget)
self.e1.setGeometry(QtCore.QRect(60, 70, 31, 111))
self.e1.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.e1.setText("")
self.e1.setObjectName("e1")
self.f1 = QtWidgets.QPushButton(self.centralwidget)
self.f1.setGeometry(QtCore.QRect(90, 70, 31, 111))
self.f1.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.f1.setText("")
self.f1.setObjectName("f1")
self.g1 = QtWidgets.QPushButton(self.centralwidget)
self.g1.setGeometry(QtCore.QRect(120, 70, 31, 111))
self.g1.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.g1.setText("")
self.g1.setObjectName("g1")
self.a1 = QtWidgets.QPushButton(self.centralwidget)
self.a1.setGeometry(QtCore.QRect(150, 70, 31, 111))
self.a1.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.a1.setText("")
self.a1.setObjectName("a1")
self.b1 = QtWidgets.QPushButton(self.centralwidget)
self.b1.setGeometry(QtCore.QRect(180, 70, 31, 111))
self.b1.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.b1.setText("")
self.b1.setObjectName("b1")
self.c2 = QtWidgets.QPushButton(self.centralwidget)
self.c2.setGeometry(QtCore.QRect(210, 70, 31, 111))
self.c2.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.c2.setText("")
self.c2.setObjectName("c2")
self.d2 = QtWidgets.QPushButton(self.centralwidget)
self.d2.setGeometry(QtCore.QRect(240, 70, 31, 111))
self.d2.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.d2.setText("")
self.d2.setObjectName("d2")
self.e2 = QtWidgets.QPushButton(self.centralwidget)
self.e2.setGeometry(QtCore.QRect(270, 70, 31, 111))
self.e2.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.e2.setText("")
self.e2.setObjectName("e2")
self.f2 = QtWidgets.QPushButton(self.centralwidget)
self.f2.setGeometry(QtCore.QRect(300, 70, 31, 111))
self.f2.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.f2.setText("")
self.f2.setObjectName("f2")
self.g2 = QtWidgets.QPushButton(self.centralwidget)
self.g2.setGeometry(QtCore.QRect(330, 70, 31, 111))
self.g2.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.g2.setText("")
self.g2.setObjectName("g2")
self.a2 = QtWidgets.QPushButton(self.centralwidget)
self.a2.setGeometry(QtCore.QRect(360, 70, 31, 111))
self.a2.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.a2.setText("")
self.a2.setObjectName("a2")
self.b2 = QtWidgets.QPushButton(self.centralwidget)
self.b2.setGeometry(QtCore.QRect(390, 70, 31, 111))
self.b2.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.b2.setText("")
self.b2.setObjectName("b2")
self.c3 = QtWidgets.QPushButton(self.centralwidget)
self.c3.setGeometry(QtCore.QRect(420, 70, 31, 111))
self.c3.setStyleSheet("QPushButton\n"
"background-color: rgb(255, 255, 255);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.c3.setText("")
self.c3.setObjectName("c3")
self.c1sharp = QtWidgets.QPushButton(self.centralwidget)
self.c1sharp.setGeometry(QtCore.QRect(20, 70, 21, 61))
self.c1sharp.setAutoFillBackground(False)
self.c1sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.c1sharp.setText("")
self.c1sharp.setFlat(False)
self.c1sharp.setObjectName("c1sharp")
self.d1sharp = QtWidgets.QPushButton(self.centralwidget)
self.d1sharp.setGeometry(QtCore.QRect(50, 70, 21, 61))
self.d1sharp.setAutoFillBackground(False)
self.d1sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.d1sharp.setText("")
self.d1sharp.setFlat(False)
self.d1sharp.setObjectName("d1sharp")
self.f1sharp = QtWidgets.QPushButton(self.centralwidget)
self.f1sharp.setGeometry(QtCore.QRect(110, 70, 21, 61))
self.f1sharp.setAutoFillBackground(False)
self.f1sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.f1sharp.setText("")
self.f1sharp.setFlat(False)
self.f1sharp.setObjectName("f1sharp")
self.g1sharp = QtWidgets.QPushButton(self.centralwidget)
self.g1sharp.setGeometry(QtCore.QRect(140, 70, 21, 61))
self.g1sharp.setAutoFillBackground(False)
self.g1sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.g1sharp.setText("")
self.g1sharp.setFlat(False)
self.g1sharp.setObjectName("g1sharp")
self.a1sharp = QtWidgets.QPushButton(self.centralwidget)
self.a1sharp.setGeometry(QtCore.QRect(170, 70, 21, 61))
self.a1sharp.setAutoFillBackground(False)
self.a1sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.a1sharp.setText("")
self.a1sharp.setFlat(False)
self.a1sharp.setObjectName("a1sharp")
self.c2sharp = QtWidgets.QPushButton(self.centralwidget)
self.c2sharp.setGeometry(QtCore.QRect(230, 70, 21, 61))
self.c2sharp.setAutoFillBackground(False)
self.c2sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.c2sharp.setText("")
self.c2sharp.setFlat(False)
self.c2sharp.setObjectName("c2sharp")
self.d2sharp = QtWidgets.QPushButton(self.centralwidget)
self.d2sharp.setGeometry(QtCore.QRect(260, 70, 21, 61))
self.d2sharp.setAutoFillBackground(False)
self.d2sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.d2sharp.setText("")
self.d2sharp.setFlat(False)
self.d2sharp.setObjectName("d2sharp")
self.f2sharp = QtWidgets.QPushButton(self.centralwidget)
self.f2sharp.setGeometry(QtCore.QRect(320, 70, 21, 61))
self.f2sharp.setAutoFillBackground(False)
self.f2sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.f2sharp.setText("")
self.f2sharp.setFlat(False)
self.f2sharp.setObjectName("f2sharp")
self.g2sharp = QtWidgets.QPushButton(self.centralwidget)
self.g2sharp.setGeometry(QtCore.QRect(350, 70, 21, 61))
self.g2sharp.setAutoFillBackground(False)
self.g2sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.g2sharp.setText("")
self.g2sharp.setFlat(False)
self.g2sharp.setObjectName("g2sharp")
self.a2sharp = QtWidgets.QPushButton(self.centralwidget)
self.a2sharp.setGeometry(QtCore.QRect(380, 70, 21, 61))
self.a2sharp.setAutoFillBackground(False)
self.a2sharp.setStyleSheet("QPushButton\n"
"background-color: rgb(0, 0, 0);\n"
"\n"
"QPushButton::pressed\n"
"background-color: rgb(255, 142, 28);\n"
"")
self.a2sharp.setText("")
self.a2sharp.setFlat(False)
self.a2sharp.setObjectName("a2sharp")
self.browsebtn = QtWidgets.QPushButton(self.centralwidget)
self.browsebtn.setGeometry(QtCore.QRect(0, 0, 93, 28))
self.browsebtn.setObjectName("browsebtn")
self.label = QtWidgets.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(0, 30, 451, 16))
self.label.setObjectName("label")
MainWindow.setCentralWidget(self.centralwidget)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
self.chosenfilepath = ''
self.c1.clicked.connect(self.playc1)
self.c1sharp.clicked.connect(self.playc1sharp)
self.d1.clicked.connect(self.playd1)
self.d1sharp.clicked.connect(self.playd1sharp)
self.e1.clicked.connect(self.playe1)
self.f1.clicked.connect(self.playf1)
self.f1sharp.clicked.connect(self.playf1sharp)
self.g1.clicked.connect(self.playg1)
self.g1sharp.clicked.connect(self.playg1sharp)
self.a1.clicked.connect(self.playa1)
self.a1sharp.clicked.connect(self.playa1sharp)
self.b1.clicked.connect(self.playb1)
self.c2.clicked.connect(self.playc2)
self.c2sharp.clicked.connect(self.playc2sharp)
self.d2.clicked.connect(self.playd2)
self.d2sharp.clicked.connect(self.playd2sharp)
self.e2.clicked.connect(self.playe2)
self.f2.clicked.connect(self.playf2)
self.f2sharp.clicked.connect(self.playf2sharp)
self.g2.clicked.connect(self.playg2)
self.g2sharp.clicked.connect(self.playg2sharp)
self.a2.clicked.connect(self.playa2)
self.a2sharp.clicked.connect(self.playa2sharp)
self.b2.clicked.connect(self.playb2)
self.c3.clicked.connect(self.playc3)
self.browsebtn.clicked.connect(self.browsewavfiles)
#key presses
def browsewavfiles(self):
self.chosenfilepath = str(QFileDialog.getOpenFileName(None,"QFileDialog.getOpenFileName()", "","Wav files (*.wav)"))
self.chosenfilepath = self.chosenfilepath.replace("('", "")
self.chosenfilepath = self.chosenfilepath.replace("', 'Wav files (*.wav)')", "")
self.chosenfilepath = self.chosenfilepath.replace("\\", "/")
for i in range(len(self.chosenfilepath)):
if self.chosenfilepath[-i] == '/':
self.chosenfilepath1 = self.chosenfilepath[-i+1:]
break
self.label.setText(self.chosenfilepath1)
print(self.chosenfilepath)
def playc1(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0]))
self.t.start()
def playc1sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.08333]))
self.t.start()
def playd1(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.166666]))
self.t.start()
def playd1sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.25]))
self.t.start()
def playe1(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.3333333]))
self.t.start()
def playf1(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.416666666]))
self.t.start()
def playf1sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.5]))
self.t.start()
def playg1(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.58333333333]))
self.t.start()
def playg1sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.6666666666]))
self.t.start()
def playa1(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.75]))
self.t.start()
def playa1sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.83333333]))
self.t.start()
def playb1(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 0.916666666]))
self.t.start()
def playc2(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1]))
self.t.start()
def playc2sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.083333333]))
self.t.start()
def playd2(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.166666]))
self.t.start()
def playd2sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.25]))
self.t.start()
def playe2(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.3333333]))
self.t.start()
def playf2(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.416666666]))
self.t.start()
def playf2sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.5]))
self.t.start()
def playg2(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.58333333333]))
self.t.start()
def playg2sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.6666666666]))
self.t.start()
def playa2(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.75]))
self.t.start()
def playa2sharp(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.83333333]))
self.t.start()
def playb2(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 1.916666666]))
self.t.start()
def playc3(self):
self.t = threading.Thread(target=self.playnote, name='playNote', args=([self.chosenfilepath, 2]))
self.t.start()
def playnote(self, soundpath, octaves):
try:
sound = AudioSegment.from_file(soundpath, format="wav")
new_sample_rate = int(sound.frame_rate * (2.0 ** octaves))
hipitch_sound = sound._spawn(sound.raw_data, overrides='frame_rate': new_sample_rate)
hipitch_sound = hipitch_sound.set_frame_rate(44100)
play(hipitch_sound)
except:
print('browse for an audio file')
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.browsebtn.setText(_translate("MainWindow", "Browse"))
self.label.setText(_translate("MainWindow", "none"))
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
【问题讨论】：
【参考方案1】：标准约定是仅在按下鼠标按钮时才考虑单击按钮在光标悬停时释放按钮。
如果您需要在按下按钮后立即调用函数，请使用pressed() 信号：
按下按钮时发出此信号。
请注意，编辑 pyuic 生成的文件被认为是不好的做法。阅读有关using Designer 的官方指南，了解处理这些文件的正确方法（只能导入）。
【讨论】：
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