PySide学习笔记第九章－对话框

PySide中的对话框

对话框是用来和应用交流的，比如输入数据，更改数据，改变应用设置，对话框是用户和电脑程序的一种重要的交流方式

 一、QtGui.QInputDialog 提供了一个简便的对话框可以让用户输入数值（数值可以是：字符串，数值，也可以是一个list中的一项）。

# -*- coding: utf-8 -*-

"""
ZetCode PySide tutorial

In this example, we receive data from
a QtGui.QInputDialog dialog.

author: Jan Bodnar
website: zetcode.com
last edited: August 2011
"""

import sys
from PySide import QtGui

class Example(QtGui.QWidget):

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

        self.initUI()

    def initUI(self):

        self.btn = QtGui.QPushButton('Dialog', self) # 创建一个button,然后设定其位置
        self.btn.move(20, 20)
        self.btn.clicked.connect(self.showDialog) # 将button点击的信号和self.showDialog的槽函数联系起来

        self.le = QtGui.QLineEdit(self) # 创建一个行编辑器,然后设定其位置
        self.le.move(130, 22)

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

    def showDialog(self): # 定义槽函数
        text, ok = QtGui.QInputDialog.getText(self, 'Input Dialog', # 创建一个输入对话框,参数分别为   self:当前 QtGui.QWidget
                                              # ,'Input Dialog':title,'Input Dialog':对话框里的信息,
                                              # 该函数返回两个值,返回输入的文本和一个boolean值(点击OK,返回true)
            'Enter your name:')

        if ok: # 如果点击OK
            self.le.setText(str(text))

def main():

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


if __name__ == '__main__':
    main()

二、QtGui.QColorDialog提供了一个对话框来选择颜色

# -*- coding: utf-8 -*-

"""
ZetCode PySide tutorial

In this example, we select a colour value
from the QtGui.QColorDialog and change the background
colour of a QtGui.QFrame widget.

author: Jan Bodnar
website: zetcode.com
last edited: August 2011
"""

import sys
from PySide import QtGui

class Example(QtGui.QWidget):

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

        self.initUI()

    def initUI(self):

        col = QtGui.QColor(0, 0, 0) # 初始颜色

        self.btn = QtGui.QPushButton('Dialog', self) # 创建一个按钮,然后设定其位置
        self.btn.move(20, 20)

        self.btn.clicked.connect(self.showDialog) # 将按钮的点击信号和self.showDialog函数槽联系起来

        self.frm = QtGui.QFrame(self) # 创建一个颜色框,初始背景颜色为黑色(0,0,0)
        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):# 定义槽函数

        col = QtGui.QColorDialog.getColor() # 弹出选择颜色的对话框,并返回你所选定的颜色(当你点击Ok后)

        if col.isValid(): # 判断颜色是否有效,即你是否选定颜色后并点击了Ok
            self.frm.setStyleSheet("QWidget { background-color: %s }"
                % col.name())

def main():

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


if __name__ == '__main__':
    main()

三、字体对话框 QtGui.QFontDialog 用来选择字体，代码逻辑同上

# -*- coding: utf-8 -*-

"""
ZetCode PySide tutorial

In this example, we select a font name
and change the font of a label.

author: Jan Bodnar
website: zetcode.com
last edited: August 2011
"""

import sys
from PySide import QtGui

class Example(QtGui.QWidget):

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

        self.initUI()

    def initUI(self):

        vbox = QtGui.QVBoxLayout()

        btn = QtGui.QPushButton('Dialog', self)
        btn.setSizePolicy(QtGui.QSizePolicy.Fixed,
            QtGui.QSizePolicy.Fixed)

        btn.move(20, 20)

        vbox.addWidget(btn)

        btn.clicked.connect(self.showDialog)

        self.lbl = QtGui.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 = QtGui.QFontDialog.getFont()
        if ok:
            self.lbl.setFont(font)

def main():

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


if __name__ == '__main__':
    main()

四、文件对话框 

QtGui.QFileDialog 让用户来选择文件或者目录，既可以用来选择打开某个文件，也可以用来选择将文件存在某个目录下

import sys
from PySide import QtGui


class Example(QtGui.QMainWindow):

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

        self.initUI()

    def initUI(self):

        self.textEdit = QtGui.QTextEdit()
        self.setCentralWidget(self.textEdit)
        self.statusBar()

        openFile = QtGui.QAction(QtGui.QIcon('play.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, _ = QtGui.QFileDialog.getOpenFileName(self, 'Open file',
                    '/home')

        f = open(fname, 'r')

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


def main():

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


if __name__ == '__main__':
    main()