有時(shí)候我們需要按住Ctrl+鼠標(biāo)滾輪實(shí)現(xiàn)圖像放大或者縮小，因此需要這個(gè)事件，具體看代碼文章來源地址http://www.zghlxwxcb.cn/news/detail-533687.html

import sys
from PyQt5 import QtCore
from PyQt5.QtCore import Qt, QPoint
from PyQt5.QtGui import QPainter, QPen, QPixmap
from PyQt5.QtWidgets import QApplication, QWidget


class DemoMouseEvent(QWidget):
    def __init__(self, parent=None):
        super(DemoMouseEvent, self).__init__(parent)

        # 設(shè)置窗口標(biāo)題
        self.setWindowTitle('鼠標(biāo)事件演示')
        # 設(shè)置窗口大小
        self.setFixedSize(480, 320)

        self.beginPoint = QPoint()  # 起始點(diǎn)
        self.endPoint = QPoint()  # 結(jié)束點(diǎn)

        self.pixmap = QPixmap(self.rect().size())
        self.pixmap.fill(Qt.lightGray)

    # 重繪窗口事件
    def paintEvent(self, event):
        pp = QPainter(self.pixmap)
        pp.setPen(QPen(Qt.blue, 2))  # 設(shè)置畫筆

        # 繪制直線
        pp.drawLine(self.beginPoint, self.endPoint)
        # 上一直線的終點(diǎn)就是下一直線的起點(diǎn)
        self.beginPoint = self.endPoint

        # 在畫布上畫出
        painter = QPainter(self)
        painter.drawPixmap(0, 0, self.pixmap)

    def wheelEvent(self, ev):
        mods = ev.modifiers()
        #print('mods=', mods)
        delta = ev.angleDelta()
        #print('delta=', delta)
        if QtCore.Qt.ControlModifier == int(mods):
            if int(delta.y())>0:
                print("ctrl 向上滾輪")
            else:
                print("ctrl 向下滾輪")

    def mousePressEvent(self, event):
        # 鼠標(biāo)左鍵按下
        if event.button() == Qt.LeftButton:
            self.startPoint = event.pos()

    def mouseReleaseEvent(self, event):
        # 鼠標(biāo)左鍵釋放
        if event.button() == Qt.LeftButton:
            self.endPoint = event.pos()
            # 重新繪制
            self.update()

    def mouseMoveEvent(self, event):
        # 鼠標(biāo)左鍵按下的同時(shí)移動(dòng)鼠標(biāo)
        if event.buttons() and Qt.LeftButton:
            self.endPoint = event.pos()
            # 重新繪制
            self.update()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = DemoMouseEvent()
    window.show()
    sys.exit(app.exec())

到了這里，關(guān)于[pyqt5]觸發(fā)ctrl+鼠標(biāo)滾輪事件的文章就介紹完了。如果您還想了解更多內(nèi)容，請(qǐng)?jiān)谟疑辖撬阉鱐OY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！