Self-Order Kiosk Part 07 | React Context & MaterialUI Tutorial | 07 List Products

Self-Order Kiosk Part 07 | React Context & MaterialUI Tutorial For All Levels Web Developers
👉 Demo : https://self-order-kiosk.herokuapp.com
👉 Github : https://github.com/basir/self-order-kiosk-final

YOU WILL LEARN

• Material UI to build professional looking web applications
• Themes, Animations, Modals, Boxes, Forms and etc
• React Hooks like useState and useReducer to manage state in single components
• React Context to handle complex states between multiple components
• Node and Express to build a simple simple and elegant backend
• MongoDB and Mongoose to manage orders in the backend
• Heroku to deploy your web application on cloud servers

#react

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How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

• Performance: It delivers optimal performance.
• Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
• UI design: React Native enables you to design simple and responsive UI for your mobile app.
• 3rd party plugins: This framework supports 3rd party plugins.
• Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

• Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
• Near-native user experience: React Native provides several native components, and these are platform agnostic.
• The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native

Self-Order Kiosk Part 07 | React Context & MaterialUI Tutorial | 07 List Products

Self-Order Kiosk Part 07 | React Context & MaterialUI Tutorial For All Levels Web Developers
👉 Demo : https://self-order-kiosk.herokuapp.com
👉 Github : https://github.com/basir/self-order-kiosk-final

YOU WILL LEARN

• Material UI to build professional looking web applications
• Themes, Animations, Modals, Boxes, Forms and etc
• React Hooks like useState and useReducer to manage state in single components
• React Context to handle complex states between multiple components
• Node and Express to build a simple simple and elegant backend
• MongoDB and Mongoose to manage orders in the backend
• Heroku to deploy your web application on cloud servers

#react

Create QProgressbar with QThread Real Example | PyQt5 | Python

In this python - PyQt5 tutorial we will learn about How to create a QProgressbar using QThread Real Example | PyQt5 | Python. A progress bar is used to give the user an indication of the progress of an operation and to reassure them that the application is still running.

What is PyQt5 QProgressbar ?

QProgressBar widget consists of horizontal or vertical bar that fills up gradually to indicate the progress of a task. it is often used in applications that involve time consuming operations, such as file uploads or downloads, software installations or any other process that may take a while to complete.

QProgressBar widget can be customized to display different colors, fonts, and sizes. It also provides various properties and methods that allow developers to control its behavior, such as the minimum and maximum values, the current value, and the orientation of the bar.

Overall, the QProgressBar widget is a useful tool for providing visual feedback to users on the progress of a task and can help make applications more user-friendly and intuitive.

These are the imports that we need for example

from PyQt5 import QtGui
from PyQt5.QtWidgets import QApplication, QDialog, QProgressBar, QPushButton, QVBoxLayout
import sys
from PyQt5.QtCore import Qt, QThread, pyqtSignal
import time

This is our thread class and this class extends from QThread, a QThread object manages one thread of control within the program. QThreads begin executing in run(). By default, run() starts the event loop by calling exec() and runs a Qt event loop inside the thread.

class MyThread(QThread):
    # Create a counter thread
    change_value = pyqtSignal(int)
    def run(self):
        cnt = 0
        while cnt < 100:
            cnt+=1
            time.sleep(0.3)
            self.change_value.emit(cnt)

After we create our Window class that extends from QDialog and in that class we add the requirements of our window like title, geometry and icon with QProgresBar and also a QPushButton. also we have used some style and design for our progressbar.

class Window(QDialog):
    def __init__(self):
        super().__init__()
        self.title = "PyQt5 ProgressBar"
        self.top = 200
        self.left = 500
        self.width = 300
        self.height = 100
        self.setWindowIcon(QtGui.QIcon("icon.png"))
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        vbox = QVBoxLayout()
        self.progressbar = QProgressBar()
        #self.progressbar.setOrientation(Qt.Vertical)
        self.progressbar.setMaximum(100)
        self.progressbar.setStyleSheet("QProgressBar {border: 2px solid grey;border-radius:8px;padding:1px}"
                                       "QProgressBar::chunk {background:yellow}")
        #qlineargradient(x1: 0, y1: 0.5, x2: 1, y2: 0.5, stop: 0 red, stop: 1 white);
        #self.progressbar.setStyleSheet("QProgressBar::chunk {background: qlineargradient(x1: 0, y1: 0.5, x2: 1, y2: 0.5, stop: 0 red, stop: 1 white); }")
        #self.progressbar.setTextVisible(False)
        vbox.addWidget(self.progressbar)
        self.button = QPushButton("Start Progressbar")
        self.button.clicked.connect(self.startProgressBar)
        self.button.setStyleSheet('background-color:yellow')
        vbox.addWidget(self.button)
        self.setLayout(vbox)
        self.show()

These are the methods that we are going to use for starting and setting the value of the QProgressBar.

  def startProgressBar(self):
        self.thread = MyThread()
        self.thread.change_value.connect(self.setProgressVal)
        self.thread.start()
 
    def setProgressVal(self, val):
        self.progressbar.setValue(val)

Also every PyQt5 application must create an application object. 

App = QApplication(sys.argv)

Finally, we enter the mainloop of the application. The event handling starts from this point. 

window = Window()
sys.exit(App.exec_())

Complete source code for QProgressbar with QThread

from PyQt5 import QtGui
from PyQt5.QtWidgets import QApplication, QDialog, QProgressBar, QPushButton, QVBoxLayout
import sys
from PyQt5.QtCore import Qt, QThread, pyqtSignal
import time
 
 
class MyThread(QThread):
    # Create a counter thread
    change_value = pyqtSignal(int)
    def run(self):
        cnt = 0
        while cnt < 100:
            cnt+=1
            time.sleep(0.3)
            self.change_value.emit(cnt)
class Window(QDialog):
    def __init__(self):
        super().__init__()
        self.title = "PyQt5 ProgressBar"
        self.top = 200
        self.left = 500
        self.width = 300
        self.height = 100
        self.setWindowIcon(QtGui.QIcon("icon.png"))
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        vbox = QVBoxLayout()
        self.progressbar = QProgressBar()
        #self.progressbar.setOrientation(Qt.Vertical)
        self.progressbar.setMaximum(100)
        self.progressbar.setStyleSheet("QProgressBar {border: 2px solid grey;border-radius:8px;padding:1px}"
                                       "QProgressBar::chunk {background:yellow}")
        #qlineargradient(x1: 0, y1: 0.5, x2: 1, y2: 0.5, stop: 0 red, stop: 1 white);
        #self.progressbar.setStyleSheet("QProgressBar::
        # chunk {background:
        # qlineargradient(x1: 0, y1: 0.5, x2: 1, y2: 0.5, stop: 0 red, stop: 1 white); }")
        #self.progressbar.setTextVisible(False)
        vbox.addWidget(self.progressbar)
        self.button = QPushButton("Start Progressbar")
        self.button.clicked.connect(self.startProgressBar)
        self.button.setStyleSheet('background-color:yellow')
        vbox.addWidget(self.button)
        self.setLayout(vbox)
        self.show()
 
    def startProgressBar(self):
        self.thread = MyThread()
        self.thread.change_value.connect(self.setProgressVal)
        self.thread.start()
 
    def setProgressVal(self, val):
        self.progressbar.setValue(val)
 
 
 
App = QApplication(sys.argv)
window = Window()
sys.exit(App.exec_())

This will be the result of the code for the PyQt5 QProgressBar.

PyQt5 QProgressbar With QThread Practical Example

Also you can watch the complete video for PyQt5 QProgressbar With QThread Practical Example.

article source at: https://codeloop.org

#python #pyqt5 

Self-Order Kiosk Part 05 | React Context & MaterialUI Tutorial | 05 List Categories

Self-Order Kiosk Part 05 | React Context & MaterialUI Tutorial For All Levels Web Developers
👉 Demo : https://self-order-kiosk.herokuapp.com
👉 Github : https://github.com/basir/self-order-kiosk-final

YOU WILL LEARN

• Material UI to build professional looking web applications
• Themes, Animations, Modals, Boxes, Forms and etc
• React Hooks like useState and useReducer to manage state in single components
• React Context to handle complex states between multiple components
• Node and Express to build a simple simple and elegant backend
• MongoDB and Mongoose to manage orders in the backend
• Heroku to deploy your web application on cloud servers

#react

Self-Order Kiosk Part 06 | React Context & MaterialUI Tutorial | 06 Create Products API

Self-Order Kiosk Part 06 | React Context & MaterialUI Tutorial For All Levels Web Developers
👉 Demo : https://self-order-kiosk.herokuapp.com
👉 Github : https://github.com/basir/self-order-kiosk-final

YOU WILL LEARN

• Material UI to build professional looking web applications
• Themes, Animations, Modals, Boxes, Forms and etc
• React Hooks like useState and useReducer to manage state in single components
• React Context to handle complex states between multiple components
• Node and Express to build a simple simple and elegant backend
• MongoDB and Mongoose to manage orders in the backend
• Heroku to deploy your web application on cloud servers

#react #developer #web-development