Python学习笔记：PYQT5的QStackWidget多面页例程

本文链接：https://blog.youkuaiyun.com/weixin_51303362/article/details/124372979
import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import math

class page2(QWidget):
    def __init__(self):
        super(page2,self).__init__()
        self.label1 = QLabel(self)
        self.label1.setText('aaaapage2')
        self.label1.move(50, 50)

    def paintEvent(self, event):
        self.painter = QPainter(self)
        self.painter.drawPixmap(0, 0, QPixmap("./icon/v2.jpeg"))

        self.painter.end()

class page1(QWidget):
    def __init__(self):
        super(page1,self).__init__()
        self.label1 = QLabel(self)
        self.label1.setText('abcd')
        self.label1.move(50,50)
        self.sheetStyle = {'color': '#00ffff', 'line_width': 2, 'line_shape': 1, 'shape': 'Line','pattern':0}

    def get_signal(self,dict):                       # 接收来自主程序的变更sheetStyle 信号槽
        self.sheetStyle = dict

    def page1_draw(self):
        self.painter = QPainter(self)
        print(self.sheetStyle)
        pen = QPen()
        pen_shape = [Qt.SolidLine, Qt.DashLine, Qt.DashDotLine, Qt.DotLine, Qt.DashDotDotLine, Qt.CustomDashLine]
        pen.setStyle(pen_shape[int(self.sheetStyle['line_shape'])])  # 设置线形
        color = QColor()
        color.setNamedColor(self.sheetStyle['color'])  # #xxxxxx 颜色 转换成  QColor（）
        pen.setColor(color)
        pen.setWidth(int(self.sheetStyle['line_width']))  # 设置线宽
        self.painter.setPen(pen)
        self.painter.begin(self)
        a = int(self.width() / 10)
        b = int(self.height() / 10)
        rect = QRect(a * 2, 3 * b, a * 6, 4 * b)
        startAngle = 30 * 16
        spanAngle = 120 * 16

        path = QPainterPath()
        path.addRect(150, 150, 100, 100)
        path.moveTo(100, 100)
        path.cubicTo(300, 100, 200, 200, 300, 300)  # 三级贝塞尔曲线，前二点为控制点，最后点为最终点
        path.cubicTo(100, 300, 200, 200, 100, 100)
        # path.closeSubpath();                           # 封闭

        points = QPolygon([QPoint(150, 100), QPoint(300, 150), QPoint(350, 250), QPoint(100, 300)])
        if self.sheetStyle['shape'] == 'Line':
            self.painter.drawLine(a, b, a * 9, b * 9)
        elif self.sheetStyle['shape'] == 'Points':
            for i in range(1000):
                x = 200 * (-1 + 2.0 * i / 1000) + self.width() / 2.0  # 绘制函数图像，它的周期是【-100,100】
                y = -150 * math.sin((x - self.width() / 2.0) * math.pi / 50) + self.height() / 2.0
                self.painter.drawPoint(int(x), int(y))
        elif self.sheetStyle['shape'] == 'Polyline':
            self.painter.drawPolyline(QPoint(a, b), QPoint(a * 7, b * 2), QPoint(a * 6, b * 8), QPoint(a * 2, b * 6),
                                      QPoint(a * 2, b * 1))
        elif self.sheetStyle['shape'] == 'Polygon':
            self.painter.drawPolygon(QPoint(a, b), QPoint(a * 7, b * 2), QPoint(a * 6, b * 8), QPoint(a * 2, b * 6),
                                     QPoint(a * 2, b * 1))
        elif self.sheetStyle['shape'] == 'Rect':
            self.painter.drawRect(rect)
        elif self.sheetStyle['shape'] == 'RoundedRect':
            self.painter.drawRoundedRect(rect, 25, 25, Qt.RelativeSize)
        elif self.sheetStyle['shape'] == 'Ellipse':
            self.painter.drawEllipse(rect)
        elif self.sheetStyle['shape'] == 'Arc':
            self.painter.drawArc(rect, 0, 180 * 16)
        elif self.sheetStyle['shape'] == 'Chord':
            self.painter.drawChord(rect, 16, 60 * 16)  # 扇形
        elif self.sheetStyle['shape'] == 'Pie':
            self.painter.drawPie(rect, 16, 100 * 16)
        elif self.sheetStyle['shape'] == 'Path':
            self.painter.drawPath(path)
        elif self.sheetStyle['shape'] == 'Text':
            self.painter.setFont(QFont("Arial", 30))
            self.painter.drawText(rect, Qt.AlignCenter, "Hello Qt!")
        elif self.sheetStyle['shape'] == 'Pixmap':
            self.painter.drawPixmap(0, 0, QPixmap("./icon/v1.jpeg"))
        self.painter.end()


    def paintEvent(self,event):
        self.page1_draw()



class MainWindow(QMainWindow):
    signal = pyqtSignal(dict)

    def __init__(self):

        super(MainWindow, self).__init__()
        self.setGeometry(300, 300, 800, 600)
        self.setWindowTitle('QPaint例子')
        self.sheetStyle = {'color': '#00ffff', 'line_width': 2, 'line_shape': 1, 'shape': 'Line','pattern':0}  #默认表

        self.page1 = page1()
        self.page2 = page2()
        self.btn1 = QPushButton('切换1')
        self.btn2 = QPushButton('切换2')
        self.btn3 = QPushButton('改变颜色')
        self.spin = QSpinBox()
        self.combo1 = QComboBox()
        self.combo2 = QComboBox()
        self.combo3 = QComboBox()
        self.stack = QStackedWidget()

        self.mainFrame = QWidget()
        hbox = QHBoxLayout()
        vhbox = QVBoxLayout()
        spacerItem = QSpacerItem(20, 40, QSizePolicy.Minimum, QSizePolicy.Expanding)
        shape = ['Line', 'Points', 'Polyline', 'Polygon', 'Rect', 'RoundedRect', 'Ellipse', 'Arc','Chord', 'Pie', 'Path', 'Text', 'Pixmap']
        self.combo1.addItems(shape)
        self.combo2.addItems(['SolidLine', 'DashLine', 'DashDotLine','DotLine', 'DashDotDotLine', 'CustomDashLine'])
        self.combo3.addItems(['NoBrush', 'SolidPattern', 'Dense1Pattern', 'Dense2Pattern','Dense3Pattern', 'Dense4Pattern', 'Dense5Pattern', 'Dense6Pattern','Dense7Pattern', 'HorPattern', 'VerPattern', 'CrossPattern','BDiagPattern', 'FDiagPattern', 'DiagCrossPattern'])
        btn3_color = QColor(0,255,255)
        self.spin.setMaximum(20)
        self.spin.setMinimum(1)
        self.btn3.setStyleSheet("QPushButton{ background-color: %s }" % btn3_color.name())  # 设置 frm 颜色为 clo

        vhbox.addWidget(self.btn1)
        vhbox.addWidget(self.btn2)
        vhbox.addWidget(self.btn3)
        vhbox.addWidget(self.spin)
        vhbox.addItem(spacerItem)
        vhbox.addWidget(self.combo1)
        vhbox.addWidget(self.combo2)
        vhbox.addWidget(self.combo3)
        self.stack.setFrameShape(QFrame.Box)
        self.stack.setFrameShadow(QFrame.Raised)
        self.stack.addWidget(self.page1)
        self.stack.addWidget(self.page2)

        self.page1.label1.setText('page1')
        self.page2.label1.setText('page2')

        hbox.addLayout(vhbox)
        hbox.addWidget(self.stack)
        self.mainFrame.setLayout(hbox)
        self.setCentralWidget(self.mainFrame)

#------------------槽信号-------------------------------------------------------------------------
        self.btn1.clicked.connect(self.btn1_clicked)
        self.btn2.clicked.connect(self.btn2_clicked)
        self.btn3.clicked.connect(self.btn3_clicked)
        self.spin.valueChanged.connect(self.spin_changed)

        self.combo1.currentTextChanged.connect(self.combo1_change)
        self.combo2.currentTextChanged.connect(self.combo2_change)
        self.combo3.currentTextChanged.connect(self.combo3_change)
        self.signal.connect(self.page1.get_signal)

        self.update()

    def combo1_change(self):
        self.sheetStyle['shape'] = self.combo1.currentText()
        self.signal.emit(self.sheetStyle)
        self.update()

    def combo2_change(self):
        self.sheetStyle['line_shape'] = self.combo2.currentIndex()
        self.signal.emit(self.sheetStyle)
        self.update()

    def combo3_change(self):
        self.sheetStyle['pattern'] = self.combo3.currentIndex()
        self.signal.emit(self.sheetStyle)
        self.update()

    def btn1_clicked(self):
        self.stack.setCurrentIndex(1)

    def btn2_clicked(self):
        self.stack.setCurrentIndex(0)

    def btn3_clicked(self):
        btn3_color = QColorDialog.getColor()
        self.sheetStyle['color'] = btn3_color.name()
        self.signal.emit(self.sheetStyle)
        self.btn3.autoFillBackground()
        self.btn3.setStyleSheet("QPushButton{background-color:%s}"%btn3_color.name())

    def spin_changed(self):
        self.sheetStyle['line_width'] = self.spin.value()
        self.signal.emit(self.sheetStyle)
        self.update()


    def paintEvent(self,event):
        painter = QPainter(self)
        pen = QPen(Qt.red,2,Qt.SolidLine)
        painter.setPen(pen)
        painter.begin(self)
        painter.drawLine(0,0,200,200)

        painter.end()




if __name__ == "__main__":
    app = QApplication(sys.argv)
    demo = MainWindow()
    demo.show()
    sys.exit(app.exec_())