QT快速模板

QLabel显示图片

def show_feature_imgage(self, fname, label):
    image = QImage(fname)
    label.setPixmap(QPixmap.fromImage(image))

事件绑定与引入

from PyQt5.QtCore import *
from PyQt5.QtGui import QPixmap, QImage
from PyQt5.QtWidgets import *



fengzhizhibiao_val = QLineEdit()
fengzhizhibiao_val.textChanged.connect(set_val("fengzhizhibiao", fengzhizhibiao_val))


read_data_bt = QPushButton("读取数据")
read_data_bt.clicked.connect(read_file_name)

子窗体

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *


class FirstWindow(QWidget):

    close_signal = pyqtSignal()
    def __init__(self, parent=None):
        # super这个用法是调用父类的构造函数
        # parent=None表示默认没有父Widget，如果指定父亲Widget，则调用之
        super(FirstWindow, self).__init__(parent)
        self.resize(100, 100)
        self.btn = QToolButton(self)
        self.btn.setText("click")

    def closeEvent(self, event):
        self.close_signal.emit()
        self.close()


class SecondWindow(QWidget):
    def __init__(self, parent=None):
        super(SecondWindow, self).__init__(parent)
        self.setLayout(self.functionA())

    def functionA(self):
        right = QVBoxLayout()
        right_grid = QGridLayout()



        i = 0
        fengzhi_val_label = QLabel("峰    值：")
        fengzhi_val = QLineEdit()
        right_grid.addWidget(fengzhi_val_label, i, 0)
        right_grid.addWidget(fengzhi_val, i, 1)
        i += 1

        junfanggenzhi_val_label = QLabel("均方根值：")
        junfanggenzhi_val = QLineEdit()

        right_grid.addWidget(junfanggenzhi_val_label, i, 0)
        right_grid.addWidget(junfanggenzhi_val, i, 1)
        i += 1

        qiaodu_val_label = QLabel("峭    度：")
        qiaodu_val = QLineEdit()
        right_grid.addWidget(qiaodu_val_label, i, 0)
        right_grid.addWidget(qiaodu_val, i, 1)
        i += 1

        boxingzhibiao_val_label = QLabel("波形指标：")
        boxingzhibiao_val = QLineEdit()
        right_grid.addWidget(boxingzhibiao_val_label, i, 0)
        right_grid.addWidget(boxingzhibiao_val, i, 1)
        i += 1

        fengzhizhibiao_val_label = QLabel("峰值指标：")
        fengzhizhibiao_val = QLineEdit()
        right_grid.addWidget(fengzhizhibiao_val_label, i, 0)
        right_grid.addWidget(fengzhizhibiao_val, i, 1)
        i += 1

        maichongzhibiao_val_label = QLabel("脉冲指标：")
        maichongzhibiao_val = QLineEdit()
        right_grid.addWidget(maichongzhibiao_val_label, i, 0)
        right_grid.addWidget(maichongzhibiao_val, i, 1)
        i += 1

        qiaoduzhibiao_val_label = QLabel("峭度指标：")
        qiaoduzhibiao_val = QLineEdit()
        right_grid.addWidget(qiaoduzhibiao_val_label, i, 0)
        right_grid.addWidget(qiaoduzhibiao_val, i, 1)
        i += 1

        right.addLayout(right_grid)
        h = QHBoxLayout()
        h.addLayout(right)

        return h


    def handle_click(self):
        if not self.isVisible():
            self.setWindowModality(Qt.ApplicationModal)
            self.show()


    def handle_close(self):
        self.close()


if __name__ == "__main__":
    App = QApplication(sys.argv)
    ex = FirstWindow()
    s = SecondWindow()
    ex.btn.clicked.connect(s.handle_click)
    # ex.btn.clicked.connect(ex.hide)
    ex.close_signal.connect(ex.close)
    ex.show()
    sys.exit(App.exec_())

布局

left_down = QHBoxLayout()
left_down.addWidget(dataflabel)
left_down.addWidget(edit)
left_down.addWidget(read_data_bt)
left.addLayout(left_down)

# 在MainWindow中加载界面需要套一层Widget
w = QWidget()
w.setLayout(h)
self.main_ = w
self.setCentralWidget(w)

文件对话框

# 更多参考 http://qian.sh/paper/pyqt5/%E6%8E%A7%E4%BB%B61.html

import sys
from PyQt5.QtWidgets import (QMainWindow, QTextEdit,
                             QAction, QFileDialog, QApplication)
from PyQt5.QtGui import QIcon


class Example(QMainWindow):

    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.textEdit = QTextEdit()
        self.setCentralWidget(self.textEdit)
        self.statusBar()

        openFile = QAction(QIcon('open.png'), 'Open', self)
        openFile.setShortcut('Ctrl+O')
        openFile.setStatusTip('Open new File')
        openFile.triggered.connect(self.showDialog)

        menubar = self.menuBar()
        fileMenu = menubar.addMenu('&File')
        fileMenu.addAction(openFile)

        self.setGeometry(300, 300, 350, 300)
        self.setWindowTitle('File dialog')
        self.show()

    def showDialog(self):
        fname = QFileDialog.getOpenFileName(self, 'Open file', '/home')

        if fname[0]:
            f = open(fname[0], 'r')

            with f:
                data = f.read()
                self.textEdit.setText(data)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

更改颜色

setStyleSheet("background-image: url(black.gif); color: #FFFFFF");

获取窗口图像

from PyQt5.QtGui import *
from PyQt5.QtWidgets import QApplication, QWidget
import sys

app = QApplication(sys.argv)
screen = QApplication.primaryScreen()
widget = QWidget()

screenshot = screen.grabWindow(0, 0, 0, 100, 100)
screenshot.save('shot', 'jpg')

# 如果要获取自身进程的：
from PyQt5 import QtWidgets
import sys

app = QtWidgets.QApplication(sys.argv)
w = QtWidgets.QWidget()

grab_btn=QtWidgets.QPushButton('Grab Screen')
def click_handler():
    screen = QtWidgets.QApplication.primaryScreen()
    screenshot = screen.grabWindow( w.winId() )
    screenshot.save('shot.png', 'png')
    w.close()

grab_btn.clicked.connect(click_handler)

layout = QtWidgets.QVBoxLayout()
layout.addWidget(grab_btn)
w.setLayout(layout)
w.show()

sys.exit(app.exec_())

菜单栏（注意在QMainWindow类中）

import sys
from PyQt5.QtWidgets import QMainWindow, QAction, qApp, QApplication
from PyQt5.QtGui import QIcon


class Example(QMainWindow):

    def __init__(self):
        super().__init__()

        self.initUI()


    def initUI(self):

        exitAct = QAction(QIcon('exit.png'), '&Exit', self)
        exitAct.setShortcut('Ctrl+Q')
        exitAct.setStatusTip('Exit application')
        exitAct.triggered.connect(qApp.quit)

        self.statusBar()

        menubar = self.menuBar()
        fileMenu = menubar.addMenu('&File')
        fileMenu.addAction(exitAct)

        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Simple menu')
        self.show()


if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())