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<!DOCTYPE html>
<html lang="" xml:lang="">
<head>
<title>Outstanding User Interfaces with Shiny</title>
<meta charset="utf-8" />
<meta name="author" content="David Granjon" />
<meta name="date" content="2021-11-04" />
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</head>
<body>
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class: inverse, center, title-slide, middle
# Outstanding User Interfaces with Shiny
## David Granjon
### 2021-11-04
### R in Pharma
---
# Hi there 🍕
We're in for 20 minutes of **fun**!
- Grab a ☕
- Make yourself comfortable 🛋 or 🧘
.flex.tc[
.w-30.mr3.center[
<img class="br-100" width="100px" height="100px" src="assets/images/granjda1.jpg" class="svg-img"/>
<br>
.f5[David]
.small[Senior Expert Data Scientist, Novartis]
]
]
---
class: inverse center title-slide middle
# Introduction
---
class: header_background
# Shiny
<br/>
.center[
<img src="assets/images/shiny.svg" width="20%" style="display: block; margin: auto;" class="svg-img"/>
]
- `{Shiny}` is about __10__ years old 😲😲😲.
- Today, many tools can make your apps __shining__.
- Let's review some of them ...
---
class: header_background
# What I will share today
<br>
.pull-left[
### How it started ...
<img src="assets/images/virtual-patient-1.png" width="100%"/>
]
--
.pull-right[
### ... 1 years after
<img src="assets/images/virtual-patient-3.png" width="100%"/>
]
---
class: header_background
# From the simplest app ... 👶
<br>
.center[
<iframe src="http://localhost:3511?showcase=0" width="720" height="400px" data-external="1"></iframe>
]
---
class: header_background
# Is this a Shiny app ❓
<br>
.center[
<iframe width="50%" src="http://localhost:3512" allowfullscreen="" frameborder="0" scrolling="yes" height="500px" style="margin-top: -50px"></iframe>
]
---
class: header_background
# What's the difference ❓
<br>
- __111__ lines of CSS.
--
- 29 lines of JavaScript code.
--
- 2 png images (dj gear + rotating wheel).
--
- 36 lines of R code (`{wavesurfer}` htmlWidget).
--
- Few custom HTML tags.
---
class: header_background
# What you'll learn today
<br>
.panelset[
.panel[.panel-name[🎨 Part 1]
__Tweak__ apps style with CSS and Sass
- CSS basics.
- How Sass may help you: `{sass}`.
- High level CSS and Sass tools: `{bslib}` and `{fresh}`.
]
.panel[.panel-name[💃 Part 2]
Unleash app __interactivity__ with JavaScript (JS)
- Discover how Shiny deals with inputs.
- Add React and any JS framework with `{packer}`.
- Optimize your app with custom handlers.
]
.panel[.panel-name[🧙♀️ Part 3]
Create a new template from scratch
- Discover `{charpente}`.
]
.panel[.panel-name[🚄 Part 4]
Sorry I don't have time ...
- Discover `{truelle}`.
- Use preexisting templates.
]
]
---
class: center middle
<img src="assets/images/excited-minions.gif" width="40%" style="display: block; margin: auto;" />
---
class: inverse center title-slide middle
# 🎨 Tweak with CSS and Sass 🎨
---
class: header_background
# What is CSS?
<br>
CSS stands for Cascading Style Sheets,
.small.pull-left[
### Apply CSS
.pull-left[
- Mechanism:
```
selector {
property: value;
}
```
]
.pull-right[
- With Shiny:
```r
tags$style(
"p {
color: red;
}
"
)
```
]
]
.pull-right[
<iframe width="100%" src="http://localhost:3513" allowfullscreen="" frameborder="0" scrolling="yes" height="400px"></iframe>
]
---
class: header_background
# But CSS becomes messy 🗑
<br>
- Easy to __repeat__ yourself.
- Difficult to read and maintain: 🍝 __spaghetti__ 🍝.
- It's just a __mess__ ...
<img src="assets/images/alors_heureux.gif" width="40%" style="display: block; margin: auto;" />
---
class: header_background
# Tidy your CSS with Sass 🧹
<br>
- Sass = Syntactically Awesome Style Sheets.
- __Programmable__: variables, functions, loops, operators, modules, ...
- Modern web development workflow.
- __DRY__ programming.
- Will __motivate__ you to learn more CSS.
--
.pull-left[
An R interface exists: `{sass}`.
```r
install.packages("sass")
```
]
.pull-right[
<img src="assets/images/sass.svg" width="40%" style="display: block; margin: auto;" class="svg-img"/>
]
---
class: header_background
# {sass} in action
<br>
.panelset[
.panel[.panel-name[Variables]
.small.pull-left[
```r
library(sass)
rule1 <- ".class-1{ color: $color; }"
rule2 <- ".class-2{ background-color: $color; }"
sass(input = list(color = "purple", rule1, rule2))
```
]
.pull-right[
```
#> /* CSS */
#> .class-1 {
#> color: purple;
#> }
#>
#> .class-2 {
#> background-color: purple;
#> }
```
]
]
.panel[.panel-name[Functions]
.small.pull-left[
```r
sass(
list(
a = 2,
b = 4,
"@function multiply($parm1, $parm2) {
@debug 'parm1 is #{$parm1}';
@debug 'parm2 is #{$parm2}';
@return $parm1 * $parm2;
}",
".my-class {
width: multiply($a, $b) * 1px;
}"
)
)
```
]
.pull-right[
```
stdin:4 DEBUG: parm1 is 2
stdin:5 DEBUG: parm2 is 4
#> /* CSS */
#> .my-class {
#> width: 8px;
#> }
```
]
]
.panel[.panel-name[➿Loops]
.pull-left[
```r
sass(input = list(
colors = c("green", "red"),
"@each $color in $colors {
.alert-#{$color} {
color: $color;
}
}"
))
```
]
.pull-right[
```
#> .alert-green {
#> color: green;
#> }
#>
#> .alert-red {
#> color: red;
#> }
```
]
]
.panel[.panel-name[With Shiny]
.xsmall.pull-left[
```r
# CSS to include in your app
css <- sass(
sass_layer(
defaults = list(
turquoise = "#03a4ff",
cyan = "#e705be",
green = "#f3d6e9",
yellow = "#fdaf2c",
red = "#ff483e",
"scheme-main" = "hsl(0, 0%, 10%)"
),
rules = sass_file(
input = system.file(
"sass/bulma/bulma.sass",
package = "OSUICode"
)
)
)
)
```
]
.pull-right[
<iframe width="100%" src="http://localhost:3514" allowfullscreen="" frameborder="0" scrolling="yes" height="300px"></iframe>
]
]
]
<br>
---
class: header_background
# Isn't there something easier?
<br>
--
.pull-left[
## {fresh}
- Built on top of `{sass}`.
- For `{shiny}`, `{shinydashboard}`, ...
```r
install.packages("fresh")
```
]
--
.pull-right[
## {bslib}
- Built on top of `{sass}`.
- For `{shiny}`.
- Live theming widget.
- Dynamic theming.
- Conditional rendering.
- ...
```r
install.packages("bslib")
```
]
---
class: header_background
# A dark theme with {fresh}
<br>
.xsmall.pull-left[
```r
library(fresh)
dark_theme <- create_theme(
bs4dash_vars(
navbar_light_color = "#bec5cb",
navbar_light_active_color = "#FFF",
navbar_light_hover_color = "#FFF"
),
bs4dash_yiq(
contrasted_threshold = 10,
text_dark = "#FFF",
text_light = "#272c30"
),
bs4dash_layout(main_bg = "#353c42"),
bs4dash_sidebar_dark(
bg = "#272c30",
color = "#bec5cb",
hover_color = "#FFF",
submenu_bg = "#272c30",
submenu_color = "#FFF",
submenu_hover_color = "#FFF"
),
bs4dash_status(dark = "#272c30"),
bs4dash_color(gray_900 = "#FFF", white = "#272c30")
)
```
]
.pull-right[
<img src="assets/images/bs4Dash-fresh.png" width="100%" style="display: block; margin: auto;" />
]
---
class: header_background
# A neon theme with {bslib}
<br>
.xsmall.pull-left[
```r
library(bslib)
bslib_neon_theme <- bs_theme(
version = 4,
bg = "#000000",
fg = "#FFFFFF",
primary = "#9600FF",
secondary = "#1900A0",
success = "#38FF12",
info = "#00F5FB",
warning = "#FFF100",
danger = "#FF00E3",
base_font = "Marker Felt",
heading_font = "Marker Felt",
code_font = "Chalkduster"
)
bs_theme_preview(bslib_neon_theme, with_themer = FALSE)
```
]
.pull-right[
<iframe width="100%" src="http://localhost:3515" allowfullscreen="" frameborder="0" scrolling="yes" height="400px"></iframe>
]
---
class: header_background
# Dynamic theming example
<br>
Static plot (base R, ggplot2, ...) theming requires `{thematic}`.
.center[
<iframe width="100%" src="http://localhost:3516" allowfullscreen="" frameborder="0" scrolling="yes" height="400px"></iframe>
]
---
class: header_background
# Dynamic theming with {bs4Dash}
<br>
.center[
<iframe width="100%" src="https://dgranjon.shinyapps.io/bs4DashDemo/" allowfullscreen="" frameborder="0" scrolling="yes" height="450px" style="font-size: 0.5em"></iframe>
]
---
class: header_background
# Conditional rendering
<br>
Only 1 code base, 2 possible outputs 😎️
.pull-left[
## BS4 accordion
<iframe width="100%" src="http://localhost:3517" allowfullscreen="" frameborder="0" scrolling="yes" height="400px"></iframe>
]
.pull-right[
## BS5 accordion
<iframe width="100%" src="http://localhost:3518" allowfullscreen="" frameborder="0" scrolling="yes" height="400px"></iframe>
]
---
class: inverse center title-slide middle
# 💃 Unleash interactivity with JS 💃
---
class: header_background
# CSS does not solve all issues
<br>
What can JS do for me ❓
.pull-left[
- Add new __input widgets__.
- __Lighten__ the R logic be delegating some tasks to JS.
- More __interactive__ apps.
- Overall, a better user experience.
]
.pull-right[
<iframe width="100%" src="http://localhost:3523" allowfullscreen="" frameborder="0" scrolling="yes" height="400px"></iframe>
]
---
class: header_background
# Unleash app interactivity: example
<br>
.center[
<video height="400px" width="100%" controls>
<source src="assets/movies/js-interactivity-demo.mov" type="video/mp4">
]
---
class: header_background
# JS code can also become messy
<br>
--
- How do I include __JS__ in my Shiny project ❓
--
- What are the __best practices__ around JS code management ❓
--
- Let's try to bring some answers ...
---
class: header_background
# Relevant R/JS projects
<br>
.panelset[
.panel[.panel-name[📣 Meet `{packer}`]
.small.pull-left[
- A `{usethis}` for JavaScript/R projects.
- Supports Shiny outputs, inputs, htmlwidgets, extensions, ...
- Predefined templates: React, Vue, Framework7.
```r
install.packages("packer")
remotes::install_github("JohnCoene/packer")
```
]
.pull-right[
<a href="https://github.com/JohnCoene/packer"><img src="assets/images/packer.png" width="40%" class="svg-img"/></a>
]
]
.panel[.panel-name[💥 Scaffold project]
.small.pull-left[
We call:
```r
golem::create_golem(...)
packer::scaffold_golem(framework7 = TRUE)
packer::bundle()
```
- Sets all the necessary structure (npm, loaders, webpack, ...).
- So that you don't have to worry too much.
]
.pull-right[
<video autosize="true" controls>
<source src="assets/movies/packer-demo.mov" type="video/mp4">
</video>
]
]
]
---
class: header_background
# Application to Framework7
<br>
.small.pull-left[
- Framework7: first class mobile web framework.
- R in Pharma 2021 RinteRface [workshop](https://rinpharma2021.rinterface.com/).
- Advantages:
- No need to develop a Shiny extension.
- Faster app.
- Ease collaboration with front end dev.
]
.pull-right[
<div class="md-iphone-5 md-black-device" style="font-size: 0.5em; margin-top: -100px; !important;">
<div class="md-body">
<div class="md-buttons"></div>
<div class="md-front-camera"></div>
<div class="md-top-speaker"></div>
<div class="md-screen">
<iframe width="100%" src="http://localhost:3519" allowfullscreen="" frameborder="0" scrolling="yes" height="470px"></iframe>
</div>
<button class="md-home-button"></button>
</div>
</div>
]
---
class: header_background
# Optimize: improve user experience
<br>
.panelset[
.panel[.panel-name[`renderUI` causes lags]
.pull-left[
<iframe width="100%" src="http://localhost:3520" allowfullscreen="" frameborder="0" scrolling="yes" height="300px"></iframe>
]
.small.pull-right[
```r
dummy_task <- reactive({
Sys.sleep(5)
12
})
output$custom_box <- renderUI({
* dummy_task()
box(
title = "Box",
width = dummy_task(),
"Box body",
background = input$background
)
})
```
]
]
.panel[.panel-name[Prefer `update_*` functions]
.pull-left[
<iframe width="100%" src="http://localhost:3521" allowfullscreen="" frameborder="0" scrolling="yes" height="300px"></iframe>
]
.xsmall.pull-right[
```r
dummy_task <- reactive({
Sys.sleep(5)
12
})
observeEvent(dummy_task(), {
* updateBox2(
"mybox",
action = "update",
options = list(
width = dummy_task(),
title = tagList(
shinydashboardPlus::dashboardBadge(
"New",
color = "red"
),
"New title"
)
)
)
})
```
]
]
]
---
class: inverse center title-slide middle
# 🧙♀ New template from scratch 🧙♀
---
class: header_background
# Introducing {charpente}
<br>
.panelset[
.panel[.panel-name[📣 Meet `{charpente}`]
.xsmall.pull-left[
- Plug and play __package__ structure.
- Import dependencies from [jsdelivr](https://www.jsdelivr.com/).
- __Easy__ HTML to R conversion.
- R and JS __boilerplates__: `{shiny}` input bindings, `{shiny}` message handlers, ...
- Seamless JavaScript code management with [esbuild](https://esbuild.github.io/).
```r
remotes::install_github("RinteRface/charpente")
```
]
.pull-right[
<a href="https://github.com/RinteRface/charpente"><img src="assets/images/charpente.png" width="40%" style="display: block; margin: auto;" class="svg-img"/></a>
]
]
.panel[.panel-name[👨🏭 Workflow example]
.xsmall.pull-left[
```r
library(charpente)
path <- file.path(tempdir(), "mypkg")
create_charpente(path, license = "mit")
# Once the package is created and opened
# Look for all bulma flavors
get_dependency_versions("bulma")
# Download bulma locally
create_dependency("bulma")
# Create JS handler
create_custom_handler("modal")
# Create input binding
create_input_binding("myinput")
# Compress JS for production
build_js()
devtools::load_all()
```
]
.pull-right[
<video height="400px" width="100%" controls>
<source src="assets/movies/charpente-demo.mov" type="video/mp4">
</video>
]
]
.panel[.panel-name[Applications]
.center[
<a href="https://github.com/RinteRface/bs4Dash"><img src="assets/images/bs4Dash.svg" width="20%" style="margin: auto;" class="svg-img"/></a>
<a href="https://github.com/RinteRface/shinyMobile"><img src="assets/images/shinyMobile.svg" width="20%" style="margin: auto;" class="svg-img"/></a>
<a href="https://github.com/RinteRface/shinydashboardPlus"><img src="assets/images/shinydashboardPlus.svg" width="20%" style="margin: auto;" class="svg-img"/></a>
]
]
]
---
class: end_part_1
---
class: inverse center title-slide middle
# 🚄 Sorry I don't have time 🚄
---
class: header_background
# Use existing templates: <a href="https://github.com/RinteRface/shinyMobile"><img src="assets/images/shinyMobile.svg" width="5%" style="display: inline; margin: auto;" class="svg-img"/></a>
<br>
Built on top of [Framework7](https://framework7.io/).
.small.pull-left[
- Native look and feel for iOS and Android
- PWA support:
- Can be __installed__ on the device ...
- ... But run via a web browser.
- Provide __offline__ features (don't expect too much).
- One code base (web languages).
- ... also works for desktop apps 😏
]
.pull-right[
<div class="md-iphone-5 md-white-device" style="font-size: 0.5em; margin-top: -150px; !important;">
<div class="md-body">
<div class="md-buttons"></div>
<div class="md-front-camera"></div>
<div class="md-top-speaker"></div>
<div class="md-screen">
<iframe width="100%" src="http://localhost:3522" allowfullscreen="" frameborder="0" scrolling="yes" height="470px"></iframe>
</div>
<button class="md-home-button"></button>
</div>
</div>
]
---
class: header_background
# I want to go faster!
<br>
### {truelle} is a {golem} GUI generator <a href="https://github.com/RinteRface/truelle"><img src="assets/images/truelle.png" width="5%" style="margin: auto;" class="svg-img"/></a>
--
.small.pull-left[
```r
remotes::install_github("RinteRface/truelle")
library(truelle)
run_app()
```
]
.pull-right[
<video height="400px" width="100%" controls>
<source src="assets/movies/truelle-demo.mov" type="video/mp4">
</video>
]
---
class: center middle
# Want to learn more ❓
.center[
📖 [Read my book](https://unleash-shiny.rinterface.com) 📖
]
<img src="assets/images/shiny-ui-book.png" width="20%" style="display: block; margin: auto;" />
.center[
Thanks 🙇
]
---
class: end_part_2
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