QAbstractButton details

1, Description

• Base class for all button controls
• Provide general functions of buttons

Only by inheriting the abstract class and implementing the relevant methods can this class be used

import sys
from PyQt5.Qt import *

# The use of abstract classes requires process implementation. All method overrides of abstract classes must be implemented!
class Btn(QAbstractButton):
    def  paintEvent(self,evt):
        print("Draw button")
        # You must draw the button control yourself

        # Create a painter
        # All the patterns drawn below are on this paper - on the button
        painter = QPainter(self)  # self here is equivalent to a piece of paper

        # Give the painter a pen
        # Creating a pen parameter is the incoming color
        pen = QPen(QColor(111,200,20),10)

        # Set this pen
        painter.setPen(pen)

        # The first two parameters of the painter's drawing text are position parameters
        painter.drawText(20,20,"five hundred million")

        # ellipse
        painter.drawEllipse(0,0,100,100)


if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("QAbstractButton")
    window.resize(500,500)

    btn = Btn(window)
    btn.setText("xxx")

    btn.resize(100,100)
    btn.pressed.connect(lambda :print("Click this function"))

    window.show()

    sys.exit(app.exec_())

2, Inherit

QWidget

3, Function

3.1 prompt text

3.1.1 API

• setText(str) sets the button prompt text
• text() get button prompt text

3.1.2 application scenarios

Before the user clicks the button, the text prompt to the user: OK or cancel

3.1.3 cases

Test code:

import sys
from PyQt5.Qt import *


if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("Function test of button -- abstract class")
    window.resize(500,500)

    btn = QPushButton(window)
    btn.setText("1")


    # Implementation requirements: each time you click the button, the text number in the button will be increased by one
    def plus_one():
        print("add one-tenth")
        num = int(btn.text()) + 1
        btn.setText(str(num))

    btn.pressed.connect(plus_one)

    window.show()
    sys.exit(app.exec_())

3.2 icon related

3.2.1 API

• setIcon(QIcon("resource/h1.jpg")) sets the icon relative path icon object
• setIconSize(QSize(w,h)) sets the icon size
• icon() get Icon
• iconSize() get icon size

3.2.2 application scenarios

Before the user clicks the button, the icon prompt to the user

3.2.3 cases

Implement the above API

import sys
from PyQt5.Qt import *


if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("Icon operation")
    window.resize(500,500)

    btn = QPushButton(window)
    btn.setText("1")


    # Implementation requirements: each time you click the button, the text number in the button will be increased by one
    def plus_one():
        print("add one-tenth")
        num = int(btn.text()) + 1
        btn.setText(str(num))


    btn.pressed.connect(plus_one)


    # Create an icon object
    icon = QIcon("img.png")   # Incoming relative path
    btn.setIcon(icon)
  
    # Set the size of the icon and the width and height of the incoming QSize object
    size = QSize(50,50)
    btn.setIconSize(size)

    window.show()
    sys.exit(app.exec_())

3.3 setting shortcut keys

3.3.1 function

Click the button through the specified shortcut key

3.3.2 mode 1

With prompt text: if the prompt text contains the & symbol, QAbstractButton will automatically create a shortcut key

3.3.3 mode 2

No prompt text: setShortcut("Alt + G")

Test code:

import sys
from PyQt5.Qt import *


if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("Icon operation")
    window.resize(500,500)

    btn = QPushButton(window)
    btn.setText("1")


    # Implementation requirements: each time you click the button, the text number in the button will be increased by one
    def plus_one():
        print("add one-tenth")
        num = int(btn.text()) + 1
        btn.setText(str(num))


    # btn.pressed.connect(plus_one)


    # Create an icon object
    icon = QIcon("img.png")   # Incoming relative path
    btn.setIcon(icon)

    # Set the size of the icon and the width and height of the incoming QSize object
    size = QSize(50,50)
    btn.setIconSize(size)

    # Shortcut key setting

    btn.pressed.connect(lambda:print("The button was clicked"))  # Reconnect a slot function
    # btn.setText("&abc")  # For prompted text, add & in front of the text to create a shortcut key: ALT + A


    # If no prompt text is set
    btn.setShortcut("Alt + a") # Shortcut key string passed in





    window.show()
    sys.exit(app.exec_())

3.4 automatic repetition

3.4.1 API

• setAutoRepeat(bool) set autorepeat
• Setautorepeatinterval (milliseconds) sets the automatic repeat detection interval
• Setautorepeatdelay (MS) sets the initial detection delay

Acquisition method

• autoRepeat() gets whether to repeat automatically
• autoRepeatInterval() gets the auto repeat detection interval
• autoRepeatDelay() gets the initial detection delay

3.4.2 application scenarios

Set when the user clicks the button and wants to respond quickly and repeatedly (fire bullets and trigger events all the time)

3.4.3 cases

Create a button and set the initial text to 1

Test code:

import sys
from PyQt5.Qt import *


if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("Icon operation")
    window.resize(500,500)

    btn = QPushButton(window)
    btn.setText("1")


    # Implementation requirements: each time you click the button, the text number in the button will be increased by one
    def plus_one():
        print("add one-tenth")
        num = int(btn.text()) + 1
        btn.setText(str(num))


    btn.pressed.connect(plus_one)
    # Create an icon object
    icon = QIcon("img.png")   # Incoming relative path
    btn.setIcon(icon)

    # Set the size of the icon and the width and height of the incoming QSize object
    size = QSize(50,50)
    btn.setIconSize(size)

    # Shortcut key setting
    # btn.pressed.connect(lambda:print("The button was clicked"))  # Reconnect a slot function
    # btn.setText("&abc")  # For prompted text, add & in front of the text to create a shortcut key: ALT + A

    # If no prompt text is set
    btn.setShortcut("Alt + a") # Shortcut key string passed in

    # Automatic repeat setting
    print(btn.autoRepeat())  # See if it can be repeated automatically

    btn.setAutoRepeat(True)  # Click the button to repeat the corresponding event
    btn.setAutoRepeatDelay(2000)  # Set delay 2000ms
    btn.setAutoRepeatInterval(1000)  # Set the automatic repeat detection interval plus one every second
    window.show()
    sys.exit(app.exec_())

3.5 status

3.5.1 API

3.5.2 application scenarios

Judge the status of the button

3.5.3 cases

Test the above API

Test code 1:

import sys

from PyQt5.Qt import *

if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("Button status")
    window.resize(500,500)


    push_button = QPushButton(window)
    push_button.setText("This is QPushButton")
    push_button.move(100,100)

    radio_button = QRadioButton(window)
    radio_button.setText("This is a radio")
    radio_button.move(100,150)

    checkbox = QCheckBox(window)
    checkbox.setText("This is a checkbox")
    checkbox.move(100,200)

    # The red button can also set the background status after being pressed
    push_button.setStyleSheet("QPushButton:pressed {background-color:red;}")



    # Set all three buttons to the pressed state
    push_button.setDown(True)
    radio_button.setDown(True)
    checkbox.setDown(True)


    window.show()
    sys.exit(app.exec_())

Test code 2:

import sys

from PyQt5.Qt import *

if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("Button status")
    window.resize(500,500)


    push_button = QPushButton(window)
    push_button.setText("This is QPushButton")
    push_button.move(100,100)

    radio_button = QRadioButton(window)
    radio_button.setText("This is a radio")
    radio_button.move(100,150)

    checkbox = QCheckBox(window)
    checkbox.setText("This is a checkbox")
    checkbox.move(100,200)

    # The red button can also set the background status after being pressed
    push_button.setStyleSheet("QPushButton:pressed {background-color:red;}")

    # # Set all three buttons to the pressed state
    # push_button.setDown(True)
    # radio_button.setDown(True)
    # checkbox.setDown(True)

    # Print whether these three buttons can be selected. The first QPushButton cannot be selected
    print(push_button.isCheckable())
    print(radio_button.isCheckable())
    print(checkbox.isCheckable())

    # Set the button to be selected
    push_button.setCheckable(True)
    print(push_button.isCheckable())


    # Set all three buttons to the selected state d
    push_button.setChecked(True)
    radio_button.setChecked(True)
    checkbox.setChecked(True)

    # Check whether these three buttons are selected
    print(push_button.isChecked())
    print(radio_button.isChecked())
    print(checkbox.isChecked())

    # toggle function is to switch the state: selected or selected
    def cao():
        push_button.toggle()
        radio_button.toggle()
        checkbox.toggle()


    btn = QPushButton(window)
    btn.setText("click")
    # Click this button to switch the status of the other three buttons
    btn.pressed.connect(cao)

    window.show()
    sys.exit(app.exec_())

3.6 exclusivity

3.6.1 concept

If there are multiple buttons at the same time, and all buttons are set to be exclusive,
Only one button can be selected at the same time

3.6.2 API

3.6.3 application scenarios

Set the buttons in the button group, radio properties

3.6.4 cases

Test the above API

Test code:

import sys
from PyQt5.Qt import *


if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("Exclusivity test")
    window.resize(500,500)

    for i in range(0,3):
        btn = QPushButton(window)
        btn.setText("btn" + str(i))
        btn.move(50 * i, 50 * i)

        # Set all buttons to optional types
        btn.setCheckable(True)

        # Set button to exclusive
        btn.setAutoExclusive(True)


    window.show()
    sys.exit(app.exec_())

3.7 Click

3.7.1 API

• Click
• animateClick(ms) animation Click

3.7.2 application scenarios

• Click with the code trigger button
• Will transmit relevant signals

3.7.3 cases

Test the above API

import sys
from PyQt5.Qt import *


if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("Button click")
    window.resize(500,500)

    # Simulation button click
    btn = QPushButton(window)
    btn.setText("This is a button")
    btn.move(200,200)
    btn.pressed.connect(lambda:print("Click this button"))


    # Simulate user clicks
    btn.click()  # You can automatically click the button and trigger the slot function

    # Simulated animation Click
    btn.animateClick(2000)


    window.show()
    sys.exit(app.exec_())

3.8 setting effective area

3.8.1 API

Rewrite hitButton(QPoint): return True if valid and False if invalid

3.8.2 application scenarios

Specifies that the user clicks on an area, not a single rectangle

3.8.3 cases

The setting is valid only by clicking the circular area in the center of the button

import sys
from PyQt5.Qt import *
import math

if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = QWidget()
    window.setWindowTitle("Button click")
    window.resize(500,500)

    # Simulation button click
    # btn = QPushButton(window)
    # btn.setText("this is a button")
    # btn.move(200,200)
    # btn.pressed.connect(lambda:print("click this button"))


    # User click simulation
    # btn.click()  # You can automatically click the button and trigger the slot function
    #
    # # Simulated animation Click
    # btn.animateClick(2000)


    class Btn(QPushButton):

        # Click the button
        def hitButton(self, point):
            # print(point)
            #
            # if point.x() > self.width() / 2:
            #     return True
            #
            # return False


            # Click to trigger the slot function in a circle
            # Calculate the distance from the center of a circle by giving the coordinates of a point
            yuanxin_x = self.width() / 2
            yuanxin_y = self.height() / 2

            hit_x = point.x()
            hit_y = point.y()

            distance = math.sqrt(math.pow(hit_x - yuanxin_x,2) + math.pow(hit_y - yuanxin_y,2))

            if distance < self.width() / 2:
                return True

            return False

        # Draw an inscribed circle
        def paintEvent(self,QPaintEvent):
            super().paintEvent(QPaintEvent)


            painter = QPainter(self)
            painter.setPen(QPen(QColor(100,150,200),6))
            painter.drawEllipse(self.rect())



    btn = Btn(window)
    btn.setText("click")
    btn.move(100,100)
    btn.resize(200,200)

    # Only when the button is clicked in the specified area will the slot function be triggered
    btn.pressed.connect(lambda: print("The button was clicked"))  # The slot function is triggered only when it is determined to be valid




    window.show()
    sys.exit(app.exec_())

4, Signal

The test code has been written above