PyQt5 字体/颜色/打印/打印预览对话框

本篇介绍PyQt5 的字体选择对话框，颜色选择对话框，打印预览对话框，和打印对话框。

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import QColor, QFont
from PyQt5.QtCore import Qt
from PyQt5.QtPrintSupport import QPrinter, QPrintDialog,QPrintPreviewDialog

class App(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle("PyQt5 颜色/字体/打印相关对话框")
        vlayout  =QVBoxLayout()
        bt1 = QPushButton("字体对话框")
        bt2 = QPushButton("颜色对话框(字体颜色)")
        bt2_ = QPushButton("字体背景颜色")
        bt3 = QPushButton("打印预览对话框")
        bt4 = QPushButton("打印对话框")
        self.textEdit = QTextEdit()#初始化时换行符无效
        self.textEdit.setText("第一行\n第二行\n第三行\n")
        self.textEdit.selectAll()
 
        vlayout. addWidget(bt1)
        vlayout. addWidget(bt2)
        vlayout. addWidget(bt2_)
        vlayout. addWidget(bt3)
        vlayout. addWidget(bt4)
        vlayout. addWidget(self.textEdit)
        self.setLayout(vlayout)
 
        bt1.clicked.connect(self.font_setup)
        bt2.clicked.connect(self.textcolor_setup)
        bt2_.clicked.connect(self.textbgcolor_setup)
        bt3.clicked.connect(self.printPreview)
        bt4.clicked.connect(self.print_setup)
        self.resize(400,400)
    def font_setup(self):
        font, ok = QFontDialog.getFont()
        if ok:
            #print((font.family(), font.pointSize(), font.bold(), font.italic(),font.underline(),font.strikeOut()))
            print("字体：%s" % font.family())
            print("字号：%s" % font.pointSize())
            print("是否粗体：%s" % font.bold())
            print("是否斜体：%s" % font.italic())
            print("是否加下划线：%s" % font.underline())
            print("是否加删除线：%s" % font.strikeOut())
            self.textEdit.setCurrentFont(font)
            '''
            QTextEdit 其他 字体设置相关的方法。
            font = self.textEdit.currentFont()
            self.textEdit.setFontFamily (self, QString fontFamily)
            self.textEdit.setFontItalic (self, bool b)
            self.textEdit.setFontPointSize (self, float s)
            self.textEdit.setFontUnderline (self, bool b)
            self.textEdit.setFontWeight (self, int w)
            '''
    def textcolor_setup(self):
        '''
        .getColor.(initial: Union[QColor, Qt.GlobalColor, QGradient] = Qt.white, parent: QWidget = None, title: str = '',
                    options: Union[QColorDialog.ColorDialogOptions, QColorDialog.ColorDialogOption] = QColorDialog.ColorDialogOptions())
        '''     
        color = QColorDialog.getColor()#使用默认参数
        if color.isValid():
            self.textEdit.setTextColor (color)
            print(color.getRgb())#整形 RGBA
            print(color.getRgbF())#浮点型 RGBA
        '''
        .setTextBackgroundColor (self, QColor c)
        .setTextColor (self, QColor c)
        self.textEdit.textBackgroundColor (self)
        self.textEdit.textColor (self)
        '''
    def textbgcolor_setup(self):
        color =QColorDialog.getColor(Qt.white,None, '选择文字背景颜色',QColorDialog.ShowAlphaChannel )
        #color =QColorDialog.getColor(Qt.white,None, '选择文字背景颜色',QColorDialog.NoButtons )
        print (color.getRgb())
        if color.isValid():
            self.textEdit.setTextBackgroundColor (color)
 
    def printPreview(self):#打印预览
        dialog = QPrintPreviewDialog()
        dialog.paintRequested.connect(self.handlePrint)
        dialog.exec_()
    def print_setup(self):#打印，无预览
        printer = QPrinter()
        dialog = QPrintDialog(printer, self)
        if dialog.exec_() == QDialog.Accepted:
            self.handlePrint(printer)
    def handlePrint(self, printer):#打印方法
        self.textEdit.print(printer)
 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    ex.show()
    sys.exit(app.exec_())