PyQt 5控件

PyQt 5控件包括：按钮、复选框、滑动条、列表框等

复选框QCheckBox

QCheckBox复选框控件，它有两个状态：打开和关闭，他是一个带有文本标签（Label）的控件。复选框常用于表示程序中可以启用或者禁用的功能。

cb = QCheckBox('show title',self)

# 创建一个复选框，标题命名为show title

cb.toggle()

# 切换复选框状态，复选框默认没有勾选，并且没有标题

# Author:凌逆战
# -*- coding:utf-8 -*-
import sys
from PyQt5.QtWidgets import QWidget, QCheckBox, QApplication
from PyQt5.QtCore import Qt

class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        cb = QCheckBox('Show title', self)  # 复选框自带的文本lable
        cb.move(20, 20)
        cb.toggle() # 切换状态# 勾选复选框
        # 复选框stateChanged状态改变信号绑定self.changeTitle槽
        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_())

开关按钮Toggle button

ToggleButton是QPushButton的一种特殊模式

# Author:凌逆战
# -*- coding:utf-8 -*-
import sys
from PyQt5.QtWidgets import (QWidget, QPushButton,QFrame, QApplication)
from PyQt5.QtGui import QColor

class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.col = QColor(0, 0, 0)  # 初始黑颜色的值

        redb = QPushButton('Red', self) # 创建一个红色按钮
        redb.setCheckable(True) # 按钮设置成可检查的
        redb.move(10, 10)
        # 红色按钮点击信号和self.setColor槽连接在一起
        redb.clicked[bool].connect(self.setColor)

        greenb = QPushButton('Green', self) # 创建一个绿色按钮greenb
        greenb.setCheckable(True)   # 按钮设置成可以检查的
        greenb.move(10, 60)
        greenb.clicked[bool].connect(self.setColor)

        blueb = QPushButton('Blue', self)
        blueb.setCheckable(True)    # 通过setCheckable()方法得到一个ToggleButton
        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()  # 发送信号的人

        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_())

滑动条QSlider

sld = QSlider(QT.Horizontal,self)

# 创建一个水平滑块

# Author:凌逆战
# -*- coding:utf-8 -*-
import sys
from PyQt5.QtWidgets import (QWidget, QSlider,QLabel, QApplication)
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPixmap

class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        sld = QSlider(Qt.Horizontal, self)  # 水平的滑动条
        sld.setFocusPolicy(Qt.NoFocus)  # 设置焦点策略
        sld.setGeometry(30, 40, 100, 30)
        sld.valueChanged[int].connect(self.changeValue) # int传参

        self.label = QLabel(self)   # 创建一个QLable控件，并设置一个初始音量图标
        self.label.setPixmap(QPixmap('audio.ico'))
        self.label.setGeometry(160, 40, 80, 30)

        self.setGeometry(300, 300, 280, 170)
        self.setWindowTitle('QSlider')
        self.show()

    def changeValue(self, value):   # value形参

        if value == 0:
            self.label.setPixmap(QPixmap('audio.ico'))  # 设置像素映射
        elif value > 0 and value <= 30:
            self.label.setPixmap(QPixmap('min.ico'))
        elif value > 30 and value < 80:
            self.label.setPixmap(QPixmap('med.ico'))
        else:
            self.label.setPixmap(QPixmap('max.ico'))

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

进度条QProgressBar

self.pbar = QProgressBar(self)

# 创建进度条实例

# Author:凌逆战
# -*- coding:utf-8 -*-
import sys
from PyQt5.QtWidgets import (QWidget, QProgressBar,QPushButton, QApplication)
from PyQt5.QtCore import QBasicTimer

class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.pbar = QProgressBar(self)  # 创建一个进度条QProgressBar实例
        self.pbar.setGeometry(30, 40, 200, 25)

        self.btn = QPushButton('Start', self)   # 创建一个Start按钮实例
        self.btn.move(40, 80)
        self.btn.clicked.connect(self.doAction)

        self.timer = QBasicTimer()  # 创建一个定时器实例，用来激活QProgressBar
        self.step = 0

        self.setGeometry(300, 300, 280, 170)
        self.setWindowTitle('进度条')
        self.show()
    # 每一个QObject及其子类都有一个timeEvent()事件处理器，
    # 重写timeEvrnt，实现这个事件处理器来响应定时器事件
    def timerEvent(self, e):

        if self.step >= 100:
            self.timer.stop()
            self.btn.setText('完成')
            return

        self.step = self.step + 1
        self.pbar.setValue(self.step)   # 把step的值设置为进度条的值

    def doAction(self):

        if self.timer.isActive():
            self.timer.stop()
            self.btn.setText('Start')
        else:
            # 调用start()方法来启动一个计时器
            # 第一个参数：超时；第二个参数:对象将接受的事件
            self.timer.start(100, self) 
            self.btn.setText('Stop')

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

日历控件QCalendarWidget

cal = QCalendarWidget(self)

# 创建日历控件

cal.clicked[QDate].connect(self.showDate)

# 点击[QDate]发出信号，将信号clicked和self.showDate槽绑定

# Author:凌逆战
# -*- coding:utf-8 -*-
import sys
from PyQt5.QtWidgets import (QWidget, QCalendarWidget,QLabel, QApplication)
from PyQt5.QtCore import QDate

class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        cal = QCalendarWidget(self) # 创建一个日历控件QCalendarWidget
        cal.setGridVisible(True)    # 设置网格可视化
        cal.move(20, 20)
        cal.clicked[QDate].connect(self.showDate)

        self.lbl = QLabel(self)
        date = cal.selectedDate()
        self.lbl.setText(date.toString())   # 将data转换成字符串
        self.lbl.move(130, 260)

        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_())