個人博客點這里

PyQt5案例匯總(完整版)

起步

PyQt5是一套綁定Qt5的應用程序框架。他在Python 2.x和3.x中都是可用的。該教程使用的是Python3.x。

Qt庫是一套最有用的GUI庫。

PyQt5是作為一套Python模塊實現的。他已經超過620個類和6000個函數與方法。他是一個運行在所有主流操作系統上的多平臺組件，包括Unix,Windows和Mac OS。

說明

下面小編就給大家提供一些簡單的pyqt5的案例,如有需要拿走不謝!!!

本文轉載from:PyQt5-Chinese-tutorial

菜單欄和工具欄

01窗口居中

# 導入需要的包和模塊
import sys
from PyQt5.QtWidgets import QWidget
from PyQt5.QtWidgets import QDesktopWidget
# QDesktopWidget這個庫提供了用戶的桌面信息,包括屏幕的大小
from PyQt5.QtWidgets import QApplication

# 創(chuàng)建一個類
class Ex(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.resize(250,150)
        self.center()
        # 這個方法調用我們下面寫的,實現對話框居中的方法
        self.setWindowTitle('chuangkou要居中')
        self.show()

    def center(self):
        qr = self.frameGeometry()
        # 得到了主窗口大小
        print('qr:',qr)
        cp = QDesktopWidget().availableGeometry().center()
        # 獲取顯示器的分辨率,然后得到中間點的位置
        print('cp:',cp)
        qr.moveCenter(cp)
        # 然后把自己的窗口的中心點放到qr的中心點
        self.move(qr.topLeft())

app = QApplication(sys.argv)
demo1 = Ex()
sys.exit(app.exec_())

02 狀態(tài)欄

# 導入需要的包和模塊
import sys
# from PyQt5.QtWidgets import QWidget
# from PyQt5.QtWidgets import QDesktopWidget
# QDesktopWidget這個庫提供了用戶的桌面信息,包括屏幕的大小
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWidgets import QMainWindow


class Ex(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        # 狀態(tài)欄是由這個創(chuàng)建的
        self.statusBar().showMessage('準備')
        # 調用QtGui.QMainWindow 類的 statusBar()方法
        #3 創(chuàng)建狀態(tài)欄.第一次調用創(chuàng)建一個狀態(tài)欄,返回一個狀態(tài)欄對象.
        #3 showMessage()方法在狀態(tài)欄上顯示一條信息
        self.setGeometry(300,300,250,150)
        self.setWindowTitle('標題還是要取的')
        #顯示
        self.show()

app = QApplication(sys.argv)
demo1 = Ex()
sys.exit(app.exec_())

03菜單欄

import sys
from PyQt5.QtWidgets import QMainWindow
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWidgets import QAction
from PyQt5.QtWidgets import qApp
from PyQt5.QtGui import QIcon

class Ex(QMainWindow):

    def __init__(self):
        super(Ex, self).__init__()
        self.initUI()

    def initUI(self):
        exitAct = QAction(QIcon("exit.png"),'&Exit',self)
        print(exitAct)
        exitAct.setShortcut("ctrl+q")
        exitAct.setStatusTip('tuichu應用')
        exitAct.triggered.connect(qApp.quit)

        self.statusBar()

        menubar = self.menuBar()
        fileMenu = menubar.addMenu('&File')
        fileMenu.addAction(exitAct)

        self.setGeometry(300,300,399,200)
        self.setWindowTitle('決賽你電腦的')
        self.show()

app = QApplication(sys.argv)
demo1 = Ex()
sys.exit(app.exec_())

04子菜單

import sys
from PyQt5.QtWidgets import QMainWindow, QAction, QMenu, QApplication

class Example(QMainWindow):

    def __init__(self):
        super().__init__()
        self.initUI()


    def initUI(self):

        menubar = self.menuBar()
        fileMenu = menubar.addMenu('File')
        impMenu = QMenu('Import', self)
        impAct = QAction('Import mail', self)
        impMenu.addAction(impAct)

        newAct = QAction('New', self)

        fileMenu.addAction(newAct)
        fileMenu.addMenu(impMenu)

        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Submenu')
        self.show()


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

05 勾選菜單

import sys
from PyQt5.QtWidgets import QMainWindow, QAction, QApplication

class Example(QMainWindow):

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

        self.initUI()


    def initUI(self):

        self.statusbar = self.statusBar()
        self.statusbar.showMessage('Ready')

        menubar = self.menuBar()
        viewMenu = menubar.addMenu('View')

        # 本例創(chuàng)建了一個行為菜單。這個行為／動作能切換狀態(tài)欄顯示或者隱藏。
        viewStatAct = QAction('View statusbar', self, checkable=True)
        viewStatAct.setStatusTip('View statusbar')        # 用checkable選項創(chuàng)建一個能選中的菜單。
        viewStatAct.setChecked(True)        # 默認設置為選中狀態(tài)
        viewStatAct.triggered.connect(self.toggleMenu)

        viewMenu.addAction(viewStatAct)
        # 依據選中狀態(tài)切換狀態(tài)欄的顯示與否。
        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Check menu')
        self.show()

    def toggleMenu(self, state):

        if state:
            self.statusbar.show()
        else:
            self.statusbar.hide()

app = QApplication(sys.argv)
demo1 = Example()
sys.exit(app.exec_())

06 右鍵菜單

import sys
from PyQt5.QtWidgets import QMainWindow, qApp, QMenu, QApplication


class Example(QMainWindow):

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

        self.initUI()

    def initUI(self):
        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Context menu')
        self.show()

    def contextMenuEvent(self, event):
        cmenu = QMenu(self)

        newAct = cmenu.addAction("New")
        print(newAct)
        opnAct = cmenu.addAction("Open")
        print(opnAct)
        quitAct = cmenu.addAction("Quit")
        action = cmenu.exec_(self.mapToGlobal(event.pos()))

        if action == quitAct:
            qApp.quit()
        elif action == opnAct:
            print('打開就打開')
        elif action == newAct:
            print('新建就新建')


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

07工具欄

# 菜單欄包含了所有的命令，工具欄就是常用的命令的集合。

import sys
from PyQt5.QtWidgets import QMainWindow, QAction, qApp, QApplication
from PyQt5.QtGui import QIcon

class Example(QMainWindow):

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

        self.initUI()


    def initUI(self):

        exitAct = QAction(QIcon('logo.png'), 'Exit', self)
        exitAct.setShortcut('Ctrl+Q')
        exitAct.triggered.connect(qApp.quit)
        # 和上面的菜單欄差不多，這里使用了一個行為對象，
        # 這個對象綁定了一個標簽，一個圖標和一個快捷鍵。
        # 這些行為被觸發(fā)的時候，會調用QtGui.QMainWindow的quit方法退出應用。
        self.toolbar = self.addToolBar('Exit')
        self.toolbar.addAction(exitAct)

        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Toolbar')
        self.show()


app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
# 上面的例子中，我們創(chuàng)建了一個工具欄這個工具欄只有一個退出應用的動作

08主窗口(啥都有的呢)

# 本模塊的功能:<>
import sys
from PyQt5.QtWidgets import QMainWindow
from PyQt5.QtWidgets import QTextEdit
from PyQt5.QtWidgets import QAction
from PyQt5.QtWidgets import QApplication
from PyQt5.QtGui import QIcon


class Example(QMainWindow):

    def __init__(self):
        super().__init__()
        self.initUI()


    def initUI(self):

        textEdit = QTextEdit()
        self.setCentralWidget(textEdit)

        exitAct = QAction(QIcon('logo.png'), '退退退', self)
        exitAct.setShortcut('Ctrl+Q')
        exitAct.setStatusTip('退出應用')
        exitAct.triggered.connect(self.close)

        self.statusBar()

        menubar = self.menuBar()
        fileMenu = menubar.addMenu('文件')
        fileMenu.addAction(exitAct)

        toolbar = self.addToolBar('退出')
        toolbar.addAction(exitAct)

        self.setGeometry(300, 300, 350, 250)
        self.setWindowTitle('代碼編輯工具')
        self.show()


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

布局管理

09絕對定位的應用

import sys
from PyQt5.QtWidgets import QWidget, QLabel, QApplication

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        lbl1 = QLabel('Zetcode', self)
        lbl1.move(15, 10)

        lbl2 = QLabel('tutorials', self)
        lbl2.move(35, 40)

        lbl3 = QLabel('for programmers', self)
        lbl3.move(55, 70)

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Absolute')
        self.show()


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

# 絕對定位其實說白了就是使用相對于原點的像素來進行計算

10 盒子布局

import sys
from PyQt5.QtWidgets import (QWidget, QPushButton,
    QHBoxLayout, QVBoxLayout, QApplication)


class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        okButton = QPushButton("OK")
        cancelButton = QPushButton("Cancel")

        hbox = QHBoxLayout()
        hbox.addStretch(1)
        hbox.addWidget(okButton)
        hbox.addWidget(cancelButton)

        vbox = QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox)

        self.setLayout(vbox)

        self.setGeometry(300, 300, 300, 150)
        self.setWindowTitle('Buttons')
        self.show()


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

11 柵格布局(表格)

import sys
from PyQt5.QtWidgets import (QWidget, QGridLayout,
    QPushButton, QApplication)


class Example(QWidget):

    def __init__(self):
        super().__init__()
        self.initUI()


    def initUI(self):

        grid = QGridLayout()
        self.setLayout(grid)

        names = ['Cls', 'Bck', '', 'Close',
                 '7', '8', '9', '/',
                '4', '5', '6', '*',
                 '1', '2', '3', '-',
                '0', '.', '=', '+']

        positions = [(i,j) for i in range(5) for j in range(4)]

        for position, name in zip(positions, names):

            if name == '':
                continue
            button = QPushButton(name)
            grid.addWidget(button, *position)

        self.move(300, 150)
        self.setWindowTitle('Calculator')
        self.show()


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

12 制作提交反饋信息的布局

import sys
from PyQt5.QtWidgets import     (QWidget, QLabel, QLineEdit, QTextEdit, QGridLayout, QApplication)


class Example(QWidget):

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

        self.initUI()

    def initUI(self):
        title = QLabel('Title')
        author = QLabel('Author')
        review = QLabel('Review')

        titleEdit = QLineEdit()
        authorEdit = QLineEdit()
        reviewEdit = QTextEdit()

        grid = QGridLayout()
        grid.setSpacing(10)

        grid.addWidget(title, 1, 0)
        grid.addWidget(titleEdit, 1, 1)

        grid.addWidget(author, 2, 0)
        grid.addWidget(authorEdit, 2, 1)

        grid.addWidget(review, 3, 0)
        grid.addWidget(reviewEdit, 3, 1, 5, 1)

        self.setLayout(grid)

        self.setGeometry(300, 300, 350, 300)
        self.setWindowTitle('Review')
        self.show()


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

事件和信號

13 信號和槽機制

'''
事件
signals and slots 被其他人翻譯成信號和槽機制，(⊙o⊙)…我這里還是不翻譯好了。
所有的應用都是事件驅動的。事件大部分都是由用戶的行為產生的，當然也有其他的事件產生方式，
比如網絡的連接，窗口管理器或者定時器等。調用應用的exec_()方法時，應用會進入主循環(huán)，主循環(huán)會監(jiān)聽和分發(fā)事件。
在事件模型中，有三個角色：
事件源
事件
事件目標
事件源就是發(fā)生了狀態(tài)改變的對象。事件是這個對象狀態(tài)改變的內容。
事件目標是事件想作用的目標。事件源綁定事件處理函數，然后作用于事件目標身上。
PyQt5處理事件方面有個signal and slot機制。Signals and slots用于對象間的通訊。
事件觸發(fā)的時候，發(fā)生一個signal，slot是用來被Python調用的
（相當于一個句柄？這個詞也好惡心，就是相當于事件的綁定函數）slot只有在事件觸發(fā)的時候才能調用。
'''

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import     (QWidget, QLCDNumber, QSlider, QVBoxLayout, QApplication)


class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        lcd = QLCDNumber(self)
        print("lcd:",lcd)
        sld = QSlider(Qt.Horizontal, self)
        print("sld",sld)
        vbox = QVBoxLayout()
        print(vbox)
        vbox.addWidget(lcd)
        vbox.addWidget(sld)

        self.setLayout(vbox)
        print(lcd.display)
        sld.valueChanged.connect(lcd.display)

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('信號和槽機制的')
        self.show()


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

14 重構事件處理器

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QWidget, QApplication

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('事件的手')
        self.show()


    def keyPressEvent(self, e):

        if e.key() == Qt.Key_Escape:
            self.close()


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

15 事件對像

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QWidget, QApplication, QGridLayout, QLabel

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        grid = QGridLayout()
        grid.setSpacing(10)

        x = 0
        y = 0

        self.text = "x: {0},  y: {1}".format(x, y)

        self.label = QLabel(self.text, self)
        grid.addWidget(self.label, 0, 0, Qt.AlignTop)

        self.setMouseTracking(True)

        self.setLayout(grid)

        self.setGeometry(300, 300, 350, 200)
        self.setWindowTitle('Event object')
        self.show()


    def mouseMoveEvent(self, e):

        x = e.x()
        y = e.y()

        text = "x: {0},  y: {1}".format(x, y)
        self.label.setText(text)


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

16事件發(fā)送

import sys
from PyQt5.QtWidgets import QMainWindow, QPushButton, QApplication


class Example(QMainWindow):

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

        self.initUI()


    def initUI(self):

        btn1 = QPushButton("按鈕老大", self)
        btn1.move(30, 50)

        btn2 = QPushButton("按鈕老二", self)
        btn2.move(150, 50)

        btn1.clicked.connect(self.buttonClicked)
        btn2.clicked.connect(self.buttonClicked)

        self.statusBar()

        self.setGeometry(300, 300, 290, 150)
        self.setWindowTitle('事件發(fā)送')
        self.show()


    def buttonClicked(self):

        sender = self.sender()
        self.statusBar().showMessage(sender.text() + '被按那兒了')


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

17 信號發(fā)送

import sys
from PyQt5.QtCore import pyqtSignal, QObject
from PyQt5.QtWidgets import QMainWindow, QApplication


class Communicate(QObject):

    closeApp = pyqtSignal()


class Example(QMainWindow):

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

        self.initUI()


    def initUI(self):

        self.c = Communicate()
        self.c.closeApp.connect(self.close)

        self.setGeometry(300, 300, 290, 150)
        self.setWindowTitle('Emit signal')
        self.show()


    def mousePressEvent(self, event):

        self.c.closeApp.emit()


if __name__ == '__main__':

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

對話框

18 對話框(能夠輸入文字呦呦)

from PyQt5.QtWidgets import (QWidget, QPushButton, QLineEdit,
    QInputDialog, QApplication)
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.btn = QPushButton('Dialog', self)
        self.btn.move(20, 20)
        self.btn.clicked.connect(self.showDialog)

        self.le = QLineEdit(self)
        self.le.move(130, 22)

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


    def showDialog(self):

        text, ok = QInputDialog.getText(self, 'Input Dialog',
            'Enter your name:')

        if ok:
            self.le.setText(str(text))

        print(text+"哈哈")


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

19 選取顏色(NB壞了)

# 本模塊的功能:<QColorDialog提供顏色的選擇>
# TODO 這個厲害,直接調用系統的顏色選擇框
# TODO 強,實在是強
from PyQt5.QtWidgets import (QWidget, QPushButton, QFrame,
    QColorDialog, QApplication)
from PyQt5.QtGui import QColor
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        col = QColor(0, 0, 0)

        self.btn = QPushButton('Dialog', self)
        self.btn.move(20, 20)

        self.btn.clicked.connect(self.showDialog)

        self.frm = QFrame(self)
        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):

        col = QColorDialog.getColor()

        if col.isValid():
            self.frm.setStyleSheet("QWidget { background-color: %s }"
                % col.name())


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

加油,都看到一半了你!!!

'''

       ┌─┐       ┌─┐ + +
    ┌──┘ ┴───────┘ ┴──┐++
    │                 │
    │       ───       │++ + + +
    ███████───███████ │+
    │                 │+
    │       ─┴─       │
    │                 │
    └───┐         ┌───┘
        │         │
        │         │   + +
        │         │
        │         └──────────────┐
        │                        │
        │                        ├─┐
        │                        ┌─┘
        │                        │
        └─┐  ┐  ┌───────┬──┐  ┌──┘  + + + +
          │ ─┤ ─┤       │ ─┤ ─┤
          └──┴──┘       └──┴──┘  + + + +
                 神獸保佑
                代碼無BUG!


'''

20 選擇字體

from PyQt5.QtWidgets import (QWidget, QVBoxLayout, QPushButton,
    QSizePolicy, QLabel, QFontDialog, QApplication)
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        vbox = QVBoxLayout()

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

        btn.move(20, 20)

        vbox.addWidget(btn)

        btn.clicked.connect(self.showDialog)

        self.lbl = 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('字體目錄')
        self.show()


    def showDialog(self):

        font, ok = QFontDialog.getFont()
        if ok:
            self.lbl.setFont(font)
        print('選擇的字體是',end="")
        print(font)
        print(type(font))


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

21 選擇文件

from PyQt5.QtWidgets import     (QMainWindow, QTextEdit, QAction, QFileDialog, QApplication)
from PyQt5.QtGui import QIcon
import sys

class Example(QMainWindow):

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

        self.initUI()


    def initUI(self):

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

        openFile = QAction(QIcon('images/open.png'), 'Open', self)
        openFile.setShortcut('Ctrl+O')
        openFile.setStatusTip('打開一個新的文件')
        openFile.triggered.connect(self.showDialog)

        menubar = self.menuBar()
        fileMenu = menubar.addMenu('&文件')
        fileMenu.addAction(openFile)

        self.setGeometry(300, 300, 350, 300)
        self.setWindowTitle('File dialog')
        self.show()


    def showDialog(self):

        fname = QFileDialog.getOpenFileName(self, 'Open file', '/home')

        if fname[0]:
            f = open(fname[0], 'r')

            with f:
                data = f.read()
                self.textEdit.setText(data)
                print(data)
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())

控件

22 QCheckBox是啥玩意

from PyQt5.QtWidgets import QWidget, QCheckBox, QApplication
from PyQt5.QtCore import Qt
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        cb = QCheckBox('改改改', self)
        cb.move(20, 20)
        cb.toggle()
        cb.stateChanged.connect(self.changeTitle)

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('真正的標題')
        self.show()


    def changeTitle(self, state):

        if state == Qt.Checked:
            self.setWindowTitle('假裝有標題')
        else:
            self.setWindowTitle('沒了')


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

23 切換按鈕

from PyQt5.QtWidgets import (QWidget, QPushButton,
    QFrame, QApplication)
from PyQt5.QtGui import QColor
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.col = QColor(0, 0, 0)

        redb = QPushButton('Red', self)
        redb.setCheckable(True)
        redb.move(10, 10)

        redb.clicked[bool].connect(self.setColor)

        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_())

24 滑塊是個好東西

from PyQt5.QtWidgets import (QWidget, QSlider,
                             QLabel, QApplication)
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPixmap
import sys


class Example(QWidget):

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

        self.initUI()

    def initUI(self):

        sld = QSlider(Qt.Horizontal, self)
        sld.setFocusPolicy(Qt.NoFocus)
        sld.setGeometry(30, 40, 100, 30)
        sld.valueChanged[int].connect(self.changeValue)

        self.label = QLabel(self)
        self.label.setPixmap(QPixmap('images/logo.png'))
        self.label.setGeometry(160, 40, 80, 30)

        self.setGeometry(300, 300, 280, 170)
        self.setWindowTitle('s什么雞兒玩意r')
        self.show()

    def changeValue(self, value):

        if value == 0:
            self.label.setPixmap(QPixmap('images/1.png'))
        elif value > 0 and value <= 30:
            self.label.setPixmap(QPixmap('images/2.png'))
        elif value > 30 and value < 80:
            self.label.setPixmap(QPixmap('images/3.png'))
        else:
            self.label.setPixmap(QPixmap('images/4.png'))


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

25 進度條

from PyQt5.QtWidgets import (QWidget, QProgressBar,
    QPushButton, QApplication)
from PyQt5.QtCore import QBasicTimer
import sys

class 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('走你', self)
        self.btn.move(40, 80)
        self.btn.clicked.connect(self.doAction)

        self.timer = QBasicTimer()
        self.step = 0

        self.setGeometry(300, 300, 280, 170)
        self.setWindowTitle('進度條就比較強了')
        self.show()


    def timerEvent(self, e):

        if self.step >= 200:
            self.timer.stop()
            self.btn.setText('完成吧')
            return

        self.step = self.step + 1
        self.pbar.setValue(self.step)

    def doAction(self):

        if self.timer.isActive():
            self.timer.stop()
            self.btn.setText('走走走')
        else:
            self.timer.start(200, self)
            self.btn.setText('停,唄走了')


if __name__ == '__main__':

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

26 日歷

from PyQt5.QtWidgets import (QWidget, QCalendarWidget,
    QLabel, QApplication, QVBoxLayout)
from PyQt5.QtCore import QDate
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        vbox = QVBoxLayout(self)

        cal = QCalendarWidget(self)
        cal.setGridVisible(True)
        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('看日歷，認準我')
        self.show()


    def showDate(self, date):

        self.lbl.setText(date.toString())

if __name__ == '__main__':

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

27 圖片

from PyQt5.QtWidgets import (QWidget, QHBoxLayout,
    QLabel, QApplication)
from PyQt5.QtGui import QPixmap
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        hbox = QHBoxLayout(self)
        pixmap = QPixmap("images/09f04")

        lbl = QLabel(self)
        lbl.setPixmap(pixmap)

        hbox.addWidget(lbl)
        self.setLayout(hbox)

        self.move(300, 200)
        self.setWindowTitle('Red Rock')
        self.show()


if __name__ == '__main__':

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

28行編輯

import sys
from PyQt5.QtWidgets import     (QWidget, QLabel, QLineEdit, QApplication)


class Example(QWidget):

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

        self.initUI()

    def initUI(self):
        self.lbl = QLabel(self)
        qle = QLineEdit(self)

        qle.move(60, 100)
        self.lbl.move(60, 40)

        qle.textChanged[str].connect(self.onChanged)

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

    def onChanged(self, text):
        self.lbl.setText(text)
        self.lbl.adjustSize()


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

29 QSplitter是啥玩意呢?

from PyQt5.QtWidgets import (QWidget, QHBoxLayout, QFrame,
    QSplitter, QStyleFactory, QApplication)
from PyQt5.QtCore import Qt
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        hbox = QHBoxLayout(self)

        topleft = QFrame(self)
        topleft.setFrameShape(QFrame.StyledPanel)

        topright = QFrame(self)
        topright.setFrameShape(QFrame.StyledPanel)

        bottom = QFrame(self)
        bottom.setFrameShape(QFrame.StyledPanel)

        splitter1 = QSplitter(Qt.Horizontal)
        splitter1.addWidget(topleft)
        splitter1.addWidget(topright)

        splitter2 = QSplitter(Qt.Vertical)
        splitter2.addWidget(splitter1)
        splitter2.addWidget(bottom)

        hbox.addWidget(splitter2)
        self.setLayout(hbox)

        self.setGeometry(300, 300, 400, 300)
        self.setWindowTitle('QSplitter')
        self.show()


    def onChanged(self, text):

        self.lbl.setText(text)
        self.lbl.adjustSize()


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

30 下拉選框

from PyQt5.QtWidgets import (QWidget, QLabel,
    QComboBox, QApplication)
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.lbl = QLabel("Ubuntu", self)

        combo = QComboBox(self)
        combo.addItem("Ubuntu")
        combo.addItem("Windows")
        combo.addItem("centos")
        combo.addItem("deepin")
        combo.addItem("redhat")
        combo.addItem("debain")
        combo.move(50, 50)
        self.lbl.move(50, 150)

        combo.activated[str].connect(self.onActivated)

        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('下拉選框練習 ')
        self.show()


    def onActivated(self, text):

        self.lbl.setText(text)
        self.lbl.adjustSize()


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

拖拽

31 簡單的拖放

from PyQt5.QtWidgets import (QPushButton, QWidget,
    QLineEdit, QApplication)
import sys

class Button(QPushButton):

    def __init__(self, title, parent):
        super().__init__(title, parent)

        self.setAcceptDrops(True)


    def dragEnterEvent(self, e):

        if e.mimeData().hasFormat('text/plain'):
            e.accept()
        else:
            e.ignore()

    def dropEvent(self, e):

        self.setText(e.mimeData().text())


class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        edit = QLineEdit('', self)
        edit.setDragEnabled(True)
        edit.move(30, 65)

        button = Button("Button", self)
        button.move(190, 65)

        self.setWindowTitle('Simple drag and drop')
        self.setGeometry(300, 300, 300, 150)


if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Example()
    ex.show()
    app.exec_()

32 拖放按鈕組件

from PyQt5.QtWidgets import QPushButton, QWidget, QApplication
from PyQt5.QtCore import Qt, QMimeData
from PyQt5.QtGui import QDrag
import sys

class Button(QPushButton):

    def __init__(self, title, parent):
        super().__init__(title, parent)


    def mouseMoveEvent(self, e):

        if e.buttons() != Qt.RightButton:
            return

        mimeData = QMimeData()

        drag = QDrag(self)
        drag.setMimeData(mimeData)
        drag.setHotSpot(e.pos() - self.rect().topLeft())

        dropAction = drag.exec_(Qt.MoveAction)


    def mousePressEvent(self, e):

        super().mousePressEvent(e)

        if e.button() == Qt.LeftButton:
            print('按我嘎哈')


class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.setAcceptDrops(True)

        self.button = Button('來吧?。?！', self)
        self.button.move(100, 65)

        self.setWindowTitle('點擊還能挪')
        self.setGeometry(300, 300, 280, 150)


    def dragEnterEvent(self, e):

        e.accept()


    def dropEvent(self, e):

        position = e.pos()
        self.button.move(position)

        e.setDropAction(Qt.MoveAction)
        e.accept()


if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Example()
    ex.show()
    app.exec_()
"""
拖拽
在GUI里，拖放是指用戶點擊一個虛擬的對象，拖動，然后放置到另外一個對象上面的動作。
一般情況下，需要調用很多動作和方法，創(chuàng)建很多變量。
拖放能讓用戶很直觀的操作很復雜的邏輯。
一般情況下，我們可以拖放兩種東西：數據和圖形界面。
把一個圖像從一個應用拖放到另外一個應用上的實質是操作二進制數據。
把一個表格從Firefox上拖放到另外一個位置 的實質是操作一個圖形組。
"""

繪圖

33 文本的涂鴉(這個好玩哈)

import sys
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QColor, QFont
from PyQt5.QtCore import Qt

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.text = "涂鴉要涂的有靈魂"

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


    def paintEvent(self, event):

        qp = QPainter()
        qp.begin(self)
        self.drawText(event, qp,168, 34, 243)
        qp.end()

        # qp1 = QPainter()
        # qp1.begin(self)
        # self.drawText(event, qp1,168, 34, 23)
        # qp1.end()


    def drawText(self, event, qp, r,g,b):

        qp.setPen(QColor(r,g,b))
        qp.setFont(QFont('微軟雅黑', 15))
        qp.drawText(event.rect(), Qt.AlignCenter, self.text)


if __name__ == '__main__':

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

34 點的繪畫

from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter
from PyQt5.QtCore import Qt
import sys, random

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.setGeometry(300, 300, 300, 190)
        self.setWindowTitle('一大堆點點兒')
        self.show()


    def paintEvent(self, e):

        qp = QPainter()
        qp.begin(self)
        self.drawPoints(qp)
        qp.end()


    def drawPoints(self, qp):

        qp.setPen(Qt.red)
        size = self.size()

        for i in range(1000):
            x = random.randint(1, size.width()-1)
            y = random.randint(1, size.height()-1)
            qp.drawPoint(x, y)


if __name__ == '__main__':

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

35 顏色

from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QColor, QBrush
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.setGeometry(300, 300, 350, 100)
        self.setWindowTitle('Colours')
        self.show()


    def paintEvent(self, e):

        qp = QPainter()
        qp.begin(self)
        self.drawRectangles(qp)
        qp.end()


    def drawRectangles(self, qp):

        col = QColor(0, 0, 0)
        col.setNamedColor('#d4d4d4')
        qp.setPen(col)

        qp.setBrush(QColor(200, 0, 0))
        qp.drawRect(10, 15, 90, 60)

        qp.setBrush(QColor(255, 80, 0, 160))
        qp.drawRect(130, 15, 90, 60)

        qp.setBrush(QColor(25, 0, 90, 200))
        qp.drawRect(250, 15, 90, 60)


if __name__ == '__main__':

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

36 QPen是筆么

from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QPen
from PyQt5.QtCore import Qt
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.setGeometry(300, 300, 280, 270)
        self.setWindowTitle('Pen styles')
        self.show()


    def paintEvent(self, e):

        qp = QPainter()
        qp.begin(self)
        self.drawLines(qp)
        qp.end()


    def drawLines(self, qp):

        pen = QPen(Qt.black, 2, Qt.SolidLine)

        qp.setPen(pen)
        qp.drawLine(20, 40, 250, 40)

        pen.setStyle(Qt.DashLine)
        qp.setPen(pen)
        qp.drawLine(20, 80, 250, 80)

        pen.setStyle(Qt.DashDotLine)
        qp.setPen(pen)
        qp.drawLine(20, 120, 250, 120)

        pen.setStyle(Qt.DotLine)
        qp.setPen(pen)
        qp.drawLine(20, 160, 250, 160)

        pen.setStyle(Qt.DashDotDotLine)
        qp.setPen(pen)
        qp.drawLine(20, 200, 250, 200)

        pen.setStyle(Qt.CustomDashLine)
        pen.setDashPattern([1, 4, 5, 4])
        qp.setPen(pen)
        qp.drawLine(20, 240, 250, 240)


if __name__ == '__main__':

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

37 QBrush是啥?

from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QBrush
from PyQt5.QtCore import Qt
import sys

class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        self.setGeometry(300, 300, 355, 280)
        self.setWindowTitle('Brushes')
        self.show()


    def paintEvent(self, e):

        qp = QPainter()
        qp.begin(self)
        self.drawBrushes(qp)
        qp.end()


    def drawBrushes(self, qp):

        brush = QBrush(Qt.SolidPattern)
        qp.setBrush(brush)
        qp.drawRect(10, 15, 90, 60)

        brush.setStyle(Qt.Dense1Pattern)
        qp.setBrush(brush)
        qp.drawRect(130, 15, 90, 60)

        brush.setStyle(Qt.Dense2Pattern)
        qp.setBrush(brush)
        qp.drawRect(250, 15, 90, 60)

        brush.setStyle(Qt.DiagCrossPattern)
        qp.setBrush(brush)
        qp.drawRect(10, 105, 90, 60)

        brush.setStyle(Qt.Dense5Pattern)
        qp.setBrush(brush)
        qp.drawRect(130, 105, 90, 60)

        brush.setStyle(Qt.Dense6Pattern)
        qp.setBrush(brush)
        qp.drawRect(250, 105, 90, 60)

        brush.setStyle(Qt.HorPattern)
        qp.setBrush(brush)
        qp.drawRect(10, 195, 90, 60)

        brush.setStyle(Qt.VerPattern)
        qp.setBrush(brush)
        qp.drawRect(130, 195, 90, 60)

        brush.setStyle(Qt.BDiagPattern)
        qp.setBrush(brush)
        qp.drawRect(250, 195, 90, 60)


if __name__ == '__main__':

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

38 貝賽爾曲線(這個學過PS的都知道)

from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QPainterPath
from PyQt5.QtCore import Qt
import sys


class Example(QWidget):

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

        self.initUI()

    def initUI(self):
        # 用QPainterPath路徑創(chuàng)建貝塞爾曲線。
        # 使用cubicTo()方法生成，分別需要三個點：起始點，控制點和終止點。
        self.setGeometry(300, 300, 380, 250)
        self.setWindowTitle('繪制貝塞爾曲線')
        self.show()

    def paintEvent(self, e):
        qp = QPainter()
        qp.begin(self)
        qp.setRenderHint(QPainter.Antialiasing)
        self.drawBezierCurve(qp)
        qp.end()

    def drawBezierCurve(self, qp):
        path = QPainterPath()
        path.moveTo(30, 30)
        path.cubicTo(30, 30, 350, 30, 200, 150)

        qp.drawPath(path)


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

自定義組件

39

from PyQt5.QtWidgets import (QWidget, QSlider, QApplication,
    QHBoxLayout, QVBoxLayout)
from PyQt5.QtCore import QObject, Qt, pyqtSignal
from PyQt5.QtGui import QPainter, QFont, QColor, QPen
import sys

class Communicate(QObject):

    updateBW = pyqtSignal(int)


class BurningWidget(QWidget):

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

        self.initUI()


    def initUI(self):

        self.setMinimumSize(1, 30)
        self.value = 75
        self.num = [75, 150, 225, 300, 375, 450, 525, 600, 675]


    def setValue(self, value):

        self.value = value


    def paintEvent(self, e):

        qp = QPainter()
        qp.begin(self)
        self.drawWidget(qp)
        qp.end()


    def drawWidget(self, qp):

        MAX_CAPACITY = 700
        OVER_CAPACITY = 750

        font = QFont('Serif', 7, QFont.Light)
        qp.setFont(font)

        size = self.size()
        w = size.width()
        h = size.height()

        step = int(round(w / 10))


        till = int(((w / OVER_CAPACITY) * self.value))
        full = int(((w / OVER_CAPACITY) * MAX_CAPACITY))

        if self.value >= MAX_CAPACITY:

            qp.setPen(QColor(255, 255, 255))
            qp.setBrush(QColor(255, 255, 184))
            qp.drawRect(0, 0, full, h)
            qp.setPen(QColor(255, 175, 175))
            qp.setBrush(QColor(255, 175, 175))
            qp.drawRect(full, 0, till-full, h)

        else:

            qp.setPen(QColor(255, 255, 255))
            qp.setBrush(QColor(255, 255, 184))
            qp.drawRect(0, 0, till, h)


        pen = QPen(QColor(20, 20, 20), 1,
            Qt.SolidLine)

        qp.setPen(pen)
        qp.setBrush(Qt.NoBrush)
        qp.drawRect(0, 0, w-1, h-1)

        j = 0

        for i in range(step, 10*step, step):

            qp.drawLine(i, 0, i, 5)
            metrics = qp.fontMetrics()
            fw = metrics.width(str(self.num[j]))
            qp.drawText(i-fw/2, h/2, str(self.num[j]))
            j = j + 1


class Example(QWidget):

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

        self.initUI()


    def initUI(self):

        OVER_CAPACITY = 750

        sld = QSlider(Qt.Horizontal, self)
        sld.setFocusPolicy(Qt.NoFocus)
        sld.setRange(1, OVER_CAPACITY)
        sld.setValue(75)
        sld.setGeometry(30, 40, 150, 30)

        self.c = Communicate()
        self.wid = BurningWidget()
        self.c.updateBW[int].connect(self.wid.setValue)

        sld.valueChanged[int].connect(self.changeValue)
        hbox = QHBoxLayout()
        hbox.addWidget(self.wid)
        vbox = QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox)
        self.setLayout(vbox)

        self.setGeometry(300, 300, 390, 210)
        self.setWindowTitle('Burning widget')
        self.show()


    def changeValue(self, value):

        self.c.updateBW.emit(value)
        self.wid.repaint()


if __name__ == '__main__':

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

終于翻到底部了,能看到這里,給你自己一個獎勵吧!!!

'''

       ┌─┐       ┌─┐ + +
    ┌──┘ ┴───────┘ ┴──┐++
    │                 │
    │       ───       │++ + + +
    ███████───███████ │+
    │                 │+
    │       ─┴─       │
    │                 │
    └───┐         ┌───┘
        │         │
        │         │   + +
        │         │
        │         └──────────────┐
        │                        │
        │                        ├─┐
        │                        ┌─┘
        │                        │
        └─┐  ┐  ┌───────┬──┐  ┌──┘  + + + +
          │ ─┤ ─┤       │ ─┤ ─┤
          └──┴──┘       └──┴──┘  + + + +
                 神獸保佑
                代碼無BUG!


'''