QPUIQ 0.2.3

"PUI" Python Declarative UI Framework

What is PUI

PUI is a declarative UI framework with two-way data binding

Installation

pip install QPUIQ

Get Started

Hello World

# example/hello_world.py

from PUI.PySide6 import *

class Example(Application):
    def content(self):
        with Window(title="test", size=(320,240)):
            Label("Hello world")

root = Example()
root.run()

State & Data Binding

# example/pyside6_textfield.py

from PUI.PySide6 import *

data = State()
data.var = 0

class QtExample(QtApplication):
    def content(self):
        with QtWindow(title="blah"):
            with QtVBox():
                with QtHBox():
                    QtButton("-", self.on_minus)
                    QtLabel(f"{data.var}")
                    QtButton("+", self.on_plus)

                QtLineEdit(data("var")) # binding

    def on_minus(self):
        data.var -= 1

    def on_plus(self):
        data.var += 1

root = QtExample()
root.run()

View Component

# example/bleak_list.py

....

@PUI # View Component
def DeviceView(device, advertising_data):
    Label(f"{device.address} {device.name} {advertising_data.rssi}")

class GUI(Application):
    def __init__(self, state):
        super().__init__()
        self.state = state

    def content(self):
        with Window(title="BLE List"):
            with VBox():
                Label(f"Found {len(self.state.scanned_devices)} devices")
                for device, advertising_data in self.state.scanned_devices:
                    DeviceView(device, advertising_data)

....

Layout & Styling

# example/pyside6_feedparser.py

...
with VBox():
    Label(title).qt(StyleSheet={"font-weight":"bold"}) # QT-specific

    with HBox():
        with Scroll():
            with VBox():
                for i,e in enumerate(entries):
                    Label(e.title).click(self.entry_selected, i)
                Spacer()

        with Scroll().layout(weight=1): # Generic Layout Parameter
            if 0 <= selected and selected < len(entries):
                (Text(entries[selected].description)
                    .layout(padding=10) # Generic Layout Parameter
                    .qt(StyleSheet="background-color:white; color:black")) # QT-specific
...

Canvas

# example/pyside6_canvas.py

from PUI.PySide6 import *

data = State()
data.var = 50

class QtExample(QtApplication):
    def content(self):
        with QtWindow(title="blah", size=(640,480)):
            with QtVBox():
                QtCanvas(self.painter, data.var)
                with QtHBox():
                    QtButton("-", self.on_minus)
                    QtLabel(f"{data.var}")
                    QtButton("+", self.on_plus)

    @staticmethod
    def painter(canvas, var):
        canvas.drawText(var, var/2, f"blah {var}")
        canvas.drawLine(var, var, var*2, var*3)

    def on_minus(self):
        data.var -= 1

    def on_plus(self):
        data.var += 1

root = QtExample()
root.run()

Cookbook

python -m cookbook PySide6 (requires pygments for syntax highlight)

python -m cookbook textual

Hot-Reload with Reloadium

Backends

Tier-1

• PySide6

Lower Priority

• tkinter
  • or https://github.com/rdbende/Sun-Valley-ttk-theme
• flet
  • no canvas before v0.6.0
• textual (Text Mode)
  • no canvas

Generic Expression

• Take a look at PUI/PySide6/__init__.py

Elements

• HBox()
• VBox()
• Spacer()
• Button(text)
  • .click(callback, *cb_args, **cb_kwargs)
• Label(text)
  • .click(callback, *cb_args, **cb_kwargs)
• TextField(binding)
• ProgressBar(progress 0-1)
• Scroll()
• Canvas
  • .drawText(x, y, text)
  • .drawLine(x1, y1, x2, y2, color=0xFF0000, width=2)
  • .drawPolyline([x1, y2, ..., xn, yn], color=0xFF0000, width=2)

Layout

• .layout(width=320, height=240, weight=1)

Hot Reload

Add these lines to your view file and run with reloadium

import reloadium

# reloadium: after_reload
def after_reload(actions):
    PUIView.reload()

TODO

• Use threading.locals() instead of inspect
• State
  • Update Trigger
  • Binding
  • StateList
  • StateDict
  • Lazy UI?
• StateObject decorator
• Adapters
  • Split Application/Window, multi-windows
  • UI Flow
    • Navigation Stack
    • View Router
    • Model Window/Dialog
  • Label
  • Button
  • TextField
  • TimelimeView
  • Layout
    • HBox
    • VBox
    • ZBox
    • Grid
      • Row
      • Column
    • SwiftUI style overlay ??
  • Canvas
    • Text
    • Line
    • Rect
    • Arc
    • Image
    • ...
  • Table
  • Tree
  • Scrollbar (or as a layout setting)
• Better DOM syncer
  • Prevent unnecessary nested update
  • Trace Event Source (TextField) and prevent update it DOM Sync
• Pydantic State