yui/README.md

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Yui - A Declarative UI library for LÖVE
=======================================
**Yui** - Yet another User Interface, is a library to create menu-like GUIs
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for the [LÖVE](https://love2d.org) engine.
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## Why is that?
Because I'm spending so much time tweaking and customizing existing libraries,
I might as well make my own.
## Hello, World!
```lua
local yui = require 'lib.yui'
function love.load()
local w, h = 300, 80
local x = math.floor((love.graphics.getWidth() - w) / 2)
local y = math.floor((love.graphics.getHeight() - h) / 2)
ui = yui.Ui.new {
x = x, y = y,
yui.Rows {
yui.Label {
w = w, h = h / 2,
text = "Hello, World!"
},
yui.Button {
text = "Close",
onHit = function() love.event.quit() end
}
}
}
end
function love.update(dt)
ui:update(dt)
end
function love.draw()
ui:draw()
end
```
![Hello, World!](examples/pics/hello_world.png)
## Features
**Yui** fills the following gaps:
* Immediate mode UIs tend to clutter LÖVE `update()` code a lot, using a declarative approach - that is:
describing how the UI should look upfront, and then letting the UI code `update()` and `draw()` itself accordingly,
makes for a cleaner code.
* Adapt to different sources of input easily (keyboard, mouse, touch, gamepad).
* Out of the box internationalization.
* Out of the box keyboard navigation across widgets.
* Simple layouts (place widget in columns or rows, or possibly build rows made of several columns - grids).
* Custom widgets support.
* Custom theme support.
* Custom input sources support.
* Sufficiently compact, straightforward and hackable code.
**Yui** does have some downsides:
* The declarative approach makes UIs harder to change drastically from frame to frame.
* **Yui** tries to ameliorate this, allowing widgets property tweening, it's still less powerful
compared to an all out immediate UI approach.
* Features come with a price, **Yui**'s code tries to be small and simple, but there are definitely smaller
(and less featureful) frameworks out there.
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## Dependencies
**Yui** depends on:
* [gear](https://git.doublefourteen.io/lua/gear) for general algorithms.
* [moonspeak](https://git.doublefourteen.io/lua/moonspeak) for its localization functionality.
* ...and any of their dependencies.
You may either download each of them manually and place them inside a `lib` subdirectory, or use
[crush](https://git.doublefourteen.io/lua/crush) to do the work for you.
1. Clone this repository.
```sh
git clone https://git.doublefourteen.io/lua/yui
```
2. Move to repository root directory:
```sh
cd yui
```
3. Resolve dependencies using **crush**.
```sh
lua crush.lua
```
You should now see a `lib` subdirectory containing the necessary dependencies.
## Integrating yui in my project using crush
1. Download the latest [crush.lua](https://git.doublefourteen.io/lua/crush/src/branch/master/crush.lua) file and
place it in your project's root directory.
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2. Create a `.lovedeps` text file in your project's root with the following entry:
```lua
{
yui = "https://git.doublefourteen.io/lua/yui",
-- ...more dependencies, if necessary...
}
```
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3. **Yui** can now be downloaded directly by `crush` to the project's `lib` directory:
```sh
lua crush.lua
```
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4. Now `yui` can be `require()`d in your code, like this:
```lua
local yui = require 'lib.yui'
```
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5. Any project depending on yours will now fetch `yui`
automatically when using `crush`, following the above procedure.
## Documentation
...Ouch.
Documentation and examples are underway, however the source code is (IMHO) sufficiently
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straightforward and disciplined to have a decent overview of the functionality.
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## Acknowledgement
Portions of this library's widget rendering code are taken from the
Simple User Interface Toolkit (**SUIT**) for LÖVE by Matthias Richter.
SUIT's source code is available at: [vrld/SUIT](https://github.com/vrld/SUIT).
SUIT is licensed under the [MIT license](https://github.com/vrld/suit/blob/master/license.txt).
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Widgets offered by **yui** and basic theme are also mostly taken from SUIT.
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See [ACKNOWLEDGEMENT](README.ACKNOWLEDGEMENT) for full SUIT license
information and copyright notice.
## Similar projects
* [SUIT](https://github.com/vrld/SUIT) an excellent, simple and flexible framework for immediate UIs.
## License
Zlib, see [LICENSE](LICENSE) for details.