各种对话框

颜色对话框和字体对话框

颜色对话框：

字体对话框：

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QTextEdit, QColorDialog, QFontDialog, QPushButton, 
    QHBoxLayout, QVBoxLayout


class Demo(QWidget):
    def __init__(self):
        super(Demo, self).__init__()
        self.text_edit = QTextEdit(self)

        self.color_btn = QPushButton('颜色按钮', self)
        self.font_btn = QPushButton('字体按钮', self)
        self.color_btn.clicked.connect(lambda: self.open_dialog_func(self.color_btn))
        self.font_btn.clicked.connect(lambda: self.open_dialog_func(self.font_btn))

        self.h_layout = QHBoxLayout()
        self.h_layout.addWidget(self.color_btn)
        self.h_layout.addWidget(self.font_btn)
        self.v_layout = QVBoxLayout()
        self.v_layout.addWidget(self.text_edit)
        self.v_layout.addLayout(self.h_layout)
        self.setLayout(self.v_layout)

    def open_dialog_func(self, btn):
        if btn == self.color_btn:
            color = QColorDialog.getColor()
            #显示颜色对话框，当选择一种颜色后其十六进制的值会保存在color变量中，但如果点击对话框中的取消(Cancel)按钮的话，则color为无效值
            print(color)  #<PyQt5.QtGui.QColor object at 0x0000006AE664EE48>
            if color.isValid():#color.isValid()  返回color是否有效
                self.text_edit.setTextColor(color) #给多行文本编辑框设置颜色
        else:
            font, ok = QFontDialog.getFont()
            #显示字体对话框，该方法返回两个值，分别为QFont和bool值，如果用户选择了一种字体并按下确定(Ok)的话，则font保存所选择的QFont值，并且ok为True。若按下取消(Cancel)的话，则bool为False
            if ok:
                self.text_edit.setFont(font)  #给多行文本编辑框设置字体


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

输入对话框

样式：QInputDialog.getText 单行文本输入框

 样式:QInputDialog.getItem 下拉列表选择输入框

 样式：整数数字输入框  QInputDialog.getInt

 样式：浮点数输入框QInputDialog.getDouble

 样式：QInputDialog.getMultiLineText 多行文本输入框

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QInputDialog, QLineEdit, QTextEdit, QPushButton, 
    QGridLayout


class Demo(QWidget):
    def __init__(self):
        super(Demo, self).__init__()
        self.name_btn = QPushButton('Name', self)
        self.gender_btn = QPushButton('Gender', self)
        self.age_btn = QPushButton('Age', self)
        self.score_btn = QPushButton('Score', self)
        self.info_btn = QPushButton('Info', self)

        self.name_btn.clicked.connect(lambda: self.open_dialog_func(self.name_btn))
        self.gender_btn.clicked.connect(lambda: self.open_dialog_func(self.gender_btn))
        self.age_btn.clicked.connect(lambda: self.open_dialog_func(self.age_btn))
        self.score_btn.clicked.connect(lambda: self.open_dialog_func(self.score_btn))
        self.info_btn.clicked.connect(lambda: self.open_dialog_func(self.info_btn))

        self.name_line = QLineEdit(self)
        self.gender_line = QLineEdit(self)
        self.age_line = QLineEdit(self)
        self.score_line = QLineEdit(self)
        self.info_textedit = QTextEdit(self)

        self.g_layout = QGridLayout()
        self.g_layout.addWidget(self.name_btn, 0, 0, 1, 1)
        self.g_layout.addWidget(self.name_line, 0, 1, 1, 1)
        self.g_layout.addWidget(self.gender_btn, 1, 0, 1, 1)
        self.g_layout.addWidget(self.gender_line, 1, 1, 1, 1)
        self.g_layout.addWidget(self.age_btn, 2, 0, 1, 1)
        self.g_layout.addWidget(self.age_line, 2, 1, 1, 1)
        self.g_layout.addWidget(self.score_btn, 3, 0, 1, 1)
        self.g_layout.addWidget(self.score_line, 3, 1, 1, 1)
        self.g_layout.addWidget(self.info_btn, 4, 0, 1, 1)
        self.g_layout.addWidget(self.info_textedit, 4, 1, 1, 1)
        self.setLayout(self.g_layout)

    def open_dialog_func(self, btn):
        if btn == self.name_btn:
            name, ok = QInputDialog.getText(self, '输入对话框', '请输入名字:') #打开单行文本输入框
            #参数1：父类
            #参数2：标题      参数3：提示内容
            #返回一个字符串(用户输入的文本)和一个布尔值，若点击输入框的ok按钮，则变量ok就为True
            if ok:
                self.name_line.setText(name)
        elif btn == self.gender_btn:
            gender_list = ['男', '女']
            gender, ok = QInputDialog.getItem(self, 'Gender Input', 'Please choose the gender:', gender_list, 0, False)
            #打开下拉列表选择输入框
            #参数1：指定父类    参数2：标题    参数3：提示内容
            #参数4：要加入的选项内容
            #参数5：最初显示的选项
            #参数6：选项内容是否可编辑，这里设为False，不可编辑
            #返回两个值：第一个选择的内容-字符串   第二个如果用户点击OK按钮，就是True

            if ok:
                self.gender_line.setText(gender)
        elif btn == self.age_btn:
            age, ok = QInputDialog.getInt(self, 'Age Input', 'Please select the age:')
            #打开整数数字输入框
            #参数1：父类   参数2：标题   参数3：提示内容
            #返回两个值：第一个 用户选择的整数数值   第二个如果用户点击OK按钮，就是True
            if ok:
                self.age_line.setText(str(age))
        elif btn == self.score_btn:
            score, ok = QInputDialog.getDouble(self, 'Score Input', 'Please select the score:')
            # 打开浮点数数字输入框
            # 参数1：父类   参数2：标题   参数3：提示内容
            # 返回两个值：第一个 用户选择的数值   第二个如果用户点击OK按钮，就是True
            if ok:
                self.score_line.setText(str(score))
        else:
            info, ok = QInputDialog.getMultiLineText(self, 'Info Input', 'Please enter the info:')
            # 打开多行文本输入框
            # 参数1：父类   参数2：标题   参数3：提示内容
            # 返回两个值：第一个 用户输入的字符串   第二个如果用户点击OK按钮，就是True
            if ok:
                self.info_textedit.setText(info)


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

文件对话框

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QTextEdit, QPushButton, QMessageBox, QVBoxLayout, 
    QHBoxLayout, QFileDialog


class Demo(QWidget):
    def __init__(self):
        super(Demo, self).__init__()

        self.is_saved = True
        self.is_saved_first = True
        self.path = ''

        self.textedit = QTextEdit(self)
        self.textedit.textChanged.connect(self.on_textchanged_func)

        self.button = QPushButton('Save', self)
        self.button.clicked.connect(self.on_clicked_func)
        self.button_2 = QPushButton('Open', self)
        self.button_2.clicked.connect(self.open_file_func)
    #
        self.h_layout = QHBoxLayout()
        self.h_layout.addWidget(self.button)
        self.h_layout.addWidget(self.button_2)
        self.v_layout = QVBoxLayout()
        self.v_layout.addWidget(self.textedit)
        self.v_layout.addLayout(self.h_layout)
        self.setLayout(self.v_layout)
    #
    def on_textchanged_func(self):
        if self.textedit.toPlainText():
            self.is_saved = False
        else:
            self.is_saved = True

    def on_clicked_func(self):
        if self.is_saved_first:
            self.save_as_func(self.textedit.toPlainText())
        else:
            self.save_func(self.textedit.toPlainText())

    def save_func(self, text):
        with open(self.path, 'w') as f:
            f.write(text)
        self.is_saved = True

    def save_as_func(self, text):
        self.path, p = QFileDialog.getSaveFileName(self, 'Save File', './', 'Files (*.txt *.log)')
        #打开文件对话框
        #参数1：指定父类    参数2：标题    参数3：路径    参数4：为文件扩展名过滤器——对话框只会显示该过滤器所提供的扩展名
        #返回两个值：第一个-绝对路径     第二个过滤器
        print(self.path)  #D:/ss/ssss/lmlmlm.txt
        print(p)          #Files (*.txt *.log)
        if self.path:
            with open(self.path, 'w') as f:
                f.write(text)
            self.is_saved = True
            self.is_saved_first = False

    def open_file_func(self):
        file, _ = QFileDialog.getOpenFileName(self, 'Open File', './', 'Files (*.txt *.log)')
        if file:
            with open(file, 'r') as f:
                self.textedit.clear()
                self.textedit.setText(f.read())
                self.is_saved = True
    #
    def closeEvent(self, QCloseEvent):
        if not self.is_saved:
            choice = QMessageBox.question(self, '', 'Do you want to save the text?',
                                          QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
            if choice == QMessageBox.Yes: 
                self.on_clicked_func()
                QCloseEvent.accept()
            elif choice == QMessageBox.No:
                QCloseEvent.accept()
            else:
                QCloseEvent.ignore()


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