pyQt5-控件1

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参考:

1、https://maicss.gitbooks.io/pyqt5/content/

2、https://github.com/maicss/PyQt5-Chinese-tutoral

3、https://doc.qt.io/qt-5/classes.html  API




控件1

QCheckBox

QCheckBox组件有俩状态:开和关。通常跟标签一起使用,用在激活和关闭一些选项的场景。

#!/usr/bin/python3# -*- coding: utf-8 -*-"""ZetCode PyQt5 tutorial In this example, a QCheckBox widgetis used to toggle the title of a window.Author: Jan BodnarWebsite: zetcode.com Last edited: August 2017"""from PyQt5.QtWidgets import QWidget, QCheckBox, QApplicationfrom PyQt5.QtCore import Qtimport sysclass Example(QWidget):    def __init__(self):        super().__init__()        self.initUI()    def initUI(self):        cb = QCheckBox('Show title', self)        cb.move(20, 20)        cb.toggle() # 检查单选框的状态。默认情况下,窗口没有标题,单选框未选中        cb.stateChanged.connect(self.changeTitle)        self.setGeometry(300, 300, 250, 150)        self.setWindowTitle('QCheckBox')        self.show()    def changeTitle(self, state):        if state == Qt.Checked:            self.setWindowTitle('QCheckBox')        else:            self.setWindowTitle(' ')if __name__ == '__main__':    app = QApplication(sys.argv)    ex = Example()    sys.exit(app.exec_())



切换按钮

切换按钮就是QPushButton的一种特殊模式。 它只有两种状态:按下和未按下。我们再点击的时候切换两种状态,有很多场景会使用到这个功能。

#!/usr/bin/python3# -*- coding: utf-8 -*-"""ZetCode PyQt5 tutorial In this example, we create three toggle buttons.They will control the background color of a QFrame. 创建了一个切换按钮和一个QWidget,并把QWidget的背景设置为黑色。点击不同的切换按钮,背景色会在红、绿、蓝之间切换(而且能看到颜色合成的效果,而不是单纯的颜色覆盖)。Author: Jan BodnarWebsite: zetcode.com Last edited: August 2017"""from PyQt5.QtWidgets import (QWidget, QPushButton,    QFrame, QApplication)from PyQt5.QtGui import QColorimport sysclass Example(QWidget):    def __init__(self):        super().__init__()        self.initUI()    def initUI(self):        self.col = QColor(0, 0, 0) # 设置颜色为黑色        redb = QPushButton('Red', self)        redb.setCheckable(True) # 创建一个QPushButton,然后调用它的setCheckable()的方法就把这个按钮变成了切换按钮        redb.move(10, 10)        redb.clicked[bool].connect(self.setColor) # 这里是把点击事件转换成布尔值        greenb = QPushButton('Green', self)        greenb.setCheckable(True)        greenb.move(10, 60)        greenb.clicked[bool].connect(self.setColor)        blueb = QPushButton('Blue', self)        blueb.setCheckable(True)        blueb.move(10, 110)        blueb.clicked[bool].connect(self.setColor)        self.square = QFrame(self)        self.square.setGeometry(150, 20, 100, 100)        self.square.setStyleSheet("QWidget { background-color: %s }" %            self.col.name())        self.setGeometry(300, 300, 280, 170)        self.setWindowTitle('Toggle button')        self.show()    def setColor(self, pressed):        source = self.sender()        if pressed:            val = 255        else: val = 0        if source.text() == "Red":            self.col.setRed(val)        elif source.text() == "Green":            self.col.setGreen(val)        else:            self.col.setBlue(val)        self.square.setStyleSheet("QFrame { background-color: %s }" %            self.col.name())if __name__ == '__main__':    app = QApplication(sys.argv)    ex = Example()    sys.exit(app.exec_())
toggle button



滑块

QSlider是个有一个小滑块的组件,这个小滑块能拖着前后滑动,这个经常用于修改一些具有范围的数值,比文本框或者点击增加减少的文本框(spin box)方便多了。

#!/usr/bin/python3# -*- coding: utf-8 -*-"""ZetCode PyQt5 tutorial This example shows a QSlider widget.Author: Jan BodnarWebsite: zetcode.com Last edited: August 2017"""from PyQt5.QtWidgets import (QWidget, QSlider,    QLabel, QApplication)from PyQt5.QtCore import Qtfrom PyQt5.QtGui import QPixmapimport sysclass Example(QWidget):    def __init__(self):        super().__init__()        self.initUI()    def initUI(self):        # 创建一个水平的QSlider        sld = QSlider(Qt.Horizontal, self)        sld.setFocusPolicy(Qt.NoFocus)        sld.setGeometry(30, 40, 100, 30)        # valueChanged信号跟changeValue()方法关联起来        sld.valueChanged[int].connect(self.changeValue)        # 创建一个QLabel组件并给它设置一个静音图标        self.label = QLabel(self)        self.label.setPixmap(QPixmap('mute.png'))        self.label.setGeometry(160, 40, 80, 30)        self.setGeometry(300, 300, 280, 170)        self.setWindowTitle('QSlider')        self.show()    def changeValue(self, value):        if value == 0:            self.label.setPixmap(QPixmap('mute.png'))        elif value > 0 and value <= 30:            self.label.setPixmap(QPixmap('min.png'))        elif value > 30 and value < 80:            self.label.setPixmap(QPixmap('med.png'))        else:            self.label.setPixmap(QPixmap('max.png'))if __name__ == '__main__':    app = QApplication(sys.argv)    ex = Example()    sys.exit(app.exec_())



进度条

进度条是用来展示任务进度的(我也不想这样说话)。它的滚动能让用户了解到任务的进度。QProgressBar组件提供了水平和垂直两种进度条,进度条可以设置最大值和最小值,默认情况是0~99。

#!/usr/bin/python3# -*- coding: utf-8 -*-"""ZetCode PyQt5 tutorial This example shows a QProgressBar widget.创建了一个水平的进度条和一个按钮,这个按钮控制进度条的开始和停止。Author: Jan BodnarWebsite: zetcode.com Last edited: August 2017"""from PyQt5.QtWidgets import (QWidget, QProgressBar,    QPushButton, QApplication)from PyQt5.QtCore import QBasicTimerimport sysclass Example(QWidget):    def __init__(self):        super().__init__()        self.initUI()    def initUI(self):        self.pbar = QProgressBar(self)        self.pbar.setGeometry(30, 40, 200, 25)        self.btn = QPushButton('Start', self)        self.btn.move(40, 80)        self.btn.clicked.connect(self.doAction)        self.timer = QBasicTimer() # 用时间控制进度条        self.step = 0        self.setGeometry(300, 300, 280, 170)        self.setWindowTitle('QProgressBar')        self.show()    def timerEvent(self, e):        if self.step >= 100:            self.timer.stop()            self.btn.setText('Finished')            return        self.step = self.step + 1        self.pbar.setValue(self.step)    def doAction(self):        if self.timer.isActive():            self.timer.stop()            self.btn.setText('Start')        else:            self.timer.start(100, self)            self.btn.setText('Stop')if __name__ == '__main__':    app = QApplication(sys.argv)    ex = Example()    sys.exit(app.exec_())



日历

QCalendarWidget提供了基于月份的日历插件,十分简易而且直观。

#!/usr/bin/python3# -*- coding: utf-8 -*-"""ZetCode PyQt5 tutorial This example shows a QCalendarWidget widget.这个例子有日期组件和标签组件组成,标签显示被选中的日期。Author: Jan BodnarWebsite: zetcode.com Last edited: August 2017"""from PyQt5.QtWidgets import (QWidget, QCalendarWidget,    QLabel, QApplication, QVBoxLayout)from PyQt5.QtCore import QDateimport sysclass Example(QWidget):    def __init__(self):        super().__init__()        self.initUI()    def initUI(self):        vbox = QVBoxLayout(self)        cal = QCalendarWidget(self)        cal.setGridVisible(True)        # 选择一个日期时,QDate的点击信号就触发了,把这个信号和我们自己定义的showDate()方法关联起来。        cal.clicked[QDate].connect(self.showDate)        vbox.addWidget(cal)        self.lbl = QLabel(self)        date = cal.selectedDate()        self.lbl.setText(date.toString())        vbox.addWidget(self.lbl)        self.setLayout(vbox)        self.setGeometry(300, 300, 350, 300)        self.setWindowTitle('Calendar')        self.show()    def showDate(self, date):        self.lbl.setText(date.toString())if __name__ == '__main__':    app = QApplication(sys.argv)    ex = Example()    sys.exit(app.exec_())





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