nevu-ui 0.8.0.post1

A powerful multibackend GUI framework for Python. Made for declarative UI creation

Wiki link(BETA!)

• NevuDocs

Nevu UI means: Nevu is Eleven times better Versus other UI's User Interface

Brief Description

Nevu UI is a library for the declarative creation of user interfaces in python. The project aims to provide developers with a set of ready-made, stylable, and extensible components for the rapid creation of modern and responsive interfaces in games and multimedia applications.

The main goal of Nevu UI: to make creating interfaces in python easier and faster

Key features include:

• Layout system: Convenient arrangement of elements, for example, using grids (Grid) and scrollable containers (ScrollableColumn).
• Set of widgets: Ready-to-use elements such as buttons, input fields, and labels.
• Flexible styling: The ability to customize the appearance through a style system that supports colors, gradients, and borders.
• Animations: Built-in support for animations to create dynamic and lively interfaces.
• Declarativeness: Support for declarative interface creation

Style

Style - storage of parameters for customizing the appearance

Editable parameters:

• Gradient
• ColorTheme - Analogous to MaterialDesign, there is a ready-made set of themes - ColorThemeLibrary
• Font name/size
• Border Width/Radius
• Text Align X/Y
• Transparency

Main Features

Nevu UI allows you to describe an interface with a clear structure

Examples of declarativeness:

• Declarative approach: Describe your interface just as you see it.

  # Specify content directly when creating the layout
  grid = ui.Grid(content={(1,1): ui.Button(...)})
  

• Adaptive size system (SizeRules): Forget about pixels. Use relative values that adjust to the size of the window or parent element.
  • vh / vw: Percentage of the window's height/width.
  • fillx / filly / fill: Percentage of the parent layout's height/width/size.
  • gc / gcw / gch: Percentage of the grid cell size.
  • Prefix c: can be placed in any SizeRule, it means that the current value will be taken (without the prefix, the original will be taken).
• Powerful style system: Customize every aspect of the appearance using the universal Style object.
  • Themes: Ready-made color themes in ColorThemeLibrary.
  • Gradients: Support for linear and radial.
  • Image: Support for a background image via the bgimage parameter.
  • And much more: Fonts, borders, rounding, transparency.
• Built-in animations: Bring your interface to life with ready-made animations for movement, transparency, etc.
  • 25+ built-in animations
  • There are 2 types of animations:
    • Start - Allows you to set the initial appearance of the widget.
    • Infinite - Produces an infinite animation defined in animation_manager.
  • Usage example:
    • Start: widget.animation_manager.add_start_animation(ui.animations.EaseOut(...))
    • Infinite: widget.animation_manager.add_continuous_animation(ui.animations.EaseOut(...))

Parameter System (ParamEngine):

• ParamEngine is a convenient tool built into all layouts and widgets, it allows you to:
  • Declaratively add variables to the object's __init__
  • Check the variable type during initialization and after
  • Integrate a parameter into different stages of initialization
  • Retrieve parameter values via self.get_param(param_name).get()
  • Set parameter values via self.get_param(param_name).set(value)
• Examples:

  import nevu_ui as ui
  from typing import Unpack, NotRequired
  
  #Create a TypedDict with variables (optional, but looks nice)
  class MyWidgetKwargs(ui.WidgetKwargs):
      my_var: NotRequired[int | float]
  
  class MyWidget(ui.Widget):
      def __init__(self, size: NvVector2 | list, style: Style = default_style, **param_kwargs: Unpack[MyWidgetKwargs]):
          super().__init__(size, style, **param_kwargs)
  
      #Override the function to add parameters (mandatory)
      def _add_params(self):
          super()._add_params()
  
          #Add a parameter (mandatory)
          self._add_param('my_var', int | float)
  
          #You can also add a link to a parameter
          #self._add_param_link('my_var', 'my_var_new_name')
  
          #You can also block a parameter if necessary
          #self._block_param('my_var')
  

Installation

Dependencies:

Python >= 3.12.*

• For Building:
  • setuptools >= 61.0
  • Cython
  • numpy
• For Running:
  • numpy
  • Pillow
• Additional libraries:
  • pygame-ce>=2.3.0
  • raylib
  • pyyaml

Installation via pip

pip install nevu-ui[all]

Examples

---

Basic Grid

Declarative Approach

import nevu_ui as ui #Import Nevu UI
import pygame

pygame.init()

class MyGame(ui.Manager): #Create the base of our application
    def __init__(self):
        super().__init__(ui.Window((400, 300), title = "My Game")) #Initialize the manager
        style = ui.Style(borderradius=20, colortheme=ui.ColorThemeLibrary.material3_dark) #Create Style (optional)
        self.menu = ui.Menu(self.window, [100%ui.vw, 100%ui.vh], style = style, #Create a menu
                            layout= ui.Grid([100%ui.vw, 100%ui.vh], row=3, column=3, #Create a grid layout
                                            content = {
                                                (2, 2): ui.Button(lambda: print("You clicked!"), "BUTTON!", [50%ui.fill, 50%ui.gc], style=style) #Create a button
                                            }
                                            )
                            )
    def on_draw(self):
        self.menu.draw() #draw the menu
    def on_update(self, events):
        self.menu.update() #update the menu

game = MyGame()
game.run() #Run the finished application

Imperative Approach

import nevu_ui as ui #Import Nevu UI
import pygame

pygame.init()

window = ui.Window((400, 300), title = "My Game") #Create a window

style = ui.Style(borderradius=20, colortheme=ui.ColorThemeLibrary.material3_dark) #Create Style
menu = ui.Menu(window, [100%ui.vw, 100%ui.vh], style=style) #Create a menu
layout = ui.Grid([100%ui.vw, 100%ui.vh], row=3, column=3) #Create a grid layout
layout.add_item(ui.Button(lambda: print("You clicked!"), "BUTTON!", [50%ui.fill, 50%ui.gc], style=style), x = 2, y = 2) #Create a button

menu.layout = layout #Set the menu layout

while True: #Main loop
    events = pygame.event.get() #Get events
    window.update(events) #Update the window
    menu.update() #Update the menu
    menu.draw() #Draw the menu
    pygame.display.update() #Update the screen

Example Result

Nevu UI Status at the Moment

Layouts (Layout_Type Heirs)

(✅ - done, ❌ - not done, 💾 - deprecated and not working)

• ✅ Grid
• ✅ Row
• ✅ Column
• ✅ ScrollableRow
• ✅ ScrollableColumn
• ✅ ColorPicker
• 💾 Pages
• 💾 Gallery_Pages
• ✅ StackColumn
• ✅ StackRow
• ✅ CheckBoxGroup

Widgets (Widget Heirs)

• ✅ Widget
• ✅ Button
• ✅ Label
• ✅ Input
• ✅ EmptyWidget
• ✅ Tooltip (Pygame exclusive, for now)
• 💾 Gif
• ❌ MusicPlayer (Will be reworked, i guess?)
• ✅ ProgressBar
• ✅ SliderBar
• ✅ ElementSwitcher
• 💾 FileDialog
• ✅ RectCheckBox

Available Backends

• ✅ Pygame-ce
• ✅ Pygame-ce._sdl2(Sdl)
• ✅ RayLib

Backend Exclusives

• Ripple effect - Raylib exclusive
• Transparent colors inside Gradient - Raylib exclusive
• Customizable center and angle of the gradient - Raylib exclusive
• Tooltip - Pygame exclusive

License

Nevu UI is protected by the MIT license

Bugs

• Nevu UI is NOT a stable framework, you may encounter many bugs in it.

Additional Information

• Gmail: [e-mail]
• Creator: Nikita A.