PyQt5对话框学习

QInputDialog
用户输入使用QInputDialog输入字符,使用QLineEdit显示

import sys
from PyQt5.QtWidgets import (QWidget, QPushButton, QLineEdit,
                             QInputDialog, QApplication)


class Example(QWidget):

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

        self.initUI()

    def initUI(self):
        self.btn = QPushButton('Dialog', self)
        self.btn.move(20, 20)
        self.btn.clicked.connect(self.showDialog)

        self.le = QLineEdit(self)
        self.le.move(130, 22)

        self.setGeometry(300, 300, 290, 150)
        self.setWindowTitle('Input dialog')
        self.show()

    def showDialog(self):
        text, ok = QInputDialog.getText(self, 'Input Dialog',
                                        'Enter your name:')

        if ok:
            self.le.setText(str(text))


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

PyQt5对话框学习_第1张图片
QColorDialog
QColorDialog显示一个用于选择颜色值的对话框。

import sys
from PyQt5.QtWidgets import (QWidget, QPushButton, QFrame, 
    QColorDialog, QApplication)
from PyQt5.QtGui import QColor
 
 
class Example(QWidget):
    
    def __init__(self):
        super().__init__()
        
        self.initUI()
        
        
    def initUI(self):      
 
        col = QColor(0, 0, 0) 
 
        self.btn = QPushButton('Dialog', self)
        self.btn.move(20, 20)
 
        self.btn.clicked.connect(self.showDialog)
 
        self.frm = QFrame(self)
        self.frm.setStyleSheet("QWidget { background-color: %s }" 
            % col.name())
        self.frm.setGeometry(130, 22, 100, 100)            
        
        self.setGeometry(300, 300, 250, 180)
        self.setWindowTitle('Color dialog')
        self.show()
        
        
    def showDialog(self):
      
        col = QColorDialog.getColor()
 
        if col.isValid():
            self.frm.setStyleSheet("QWidget { background-color: %s }"
                % col.name())
            
        
if __name__ == '__main__':
    
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

QFontDialog
QFontDialog对话框用以选择字体

import sys
from PyQt5.QtWidgets import (QWidget, QVBoxLayout, QPushButton,
                             QSizePolicy, QLabel, QFontDialog, QApplication)


class Example(QWidget):

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

        self.initUI()

    def initUI(self):
        vbox = QVBoxLayout()

        btn = QPushButton('Dialog', self)
        #布置在左上角
        btn.setSizePolicy(QSizePolicy.Fixed,
                          QSizePolicy.Fixed)

        btn.move(20, 20)

        vbox.addWidget(btn)

        btn.clicked.connect(self.showDialog)

        self.lbl = QLabel('Knowledge only matters', self)
        self.lbl.move(130, 20)

        vbox.addWidget(self.lbl)
        self.setLayout(vbox)

        self.setGeometry(300, 300, 250, 180)
        self.setWindowTitle('Font dialog')
        self.show()

    def showDialog(self):
        font, ok = QFontDialog.getFont()
        if ok:
            self.lbl.setFont(font)


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

PyQt5对话框学习_第2张图片
QFileDialog
QFileDialog是一个让用户选择文件和目录的对话框

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_())

PyQt5对话框学习_第3张图片

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