There's a Framework for That!

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# There's a Framework for That!

## Seven and a Half Seconds of Fame

Adriaan de Groot
January 19th, 2020

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# A little history

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## KDE Frameworks
Replace monolithic *kdelibs4* with something easier to use.

Something
 - lightweight,
 - self-contained,
 - focused,
 - easier to consume externally.

*Cool extensions to Qt*
]

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## History
 - July 1st, 2014
 - ECM from the start
 - 53 libraries in the first release
 - 74 in release 5.66 on January 11th, 2020
]

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# That's great!

## it starts with an ..

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# Tier 1

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## Extra-CMake-Modules

Support for finding and managing all the frameworks
]

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## Earthquake

![Earthquake](img-frameworks/earthquake.png)
]

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# Tier 1

.left-column[
## Attica

Open Collaboration Services API

## KUserFeedback

User feedback framework

]

.right-column[
## Birds

![Birds](img-frameworks/bird.png)
]

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# Tier 1

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## BreezeIcons

Breeze icon theme

## Oxygen-icons

Oxygen icon theme

## QQC2-Desktop-Style

QtQuickControls 2 style that integrates with the desktop

]

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## Snakes

![Snakes](img-frameworks/snake.jpg)
]

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# Tier 1

.left-column[
## BluezQt

Qt wrapper for BlueZ 5 DBus API

## ModemManagerQt

Qt wrapper for ModemManager API

## NetworkManagerQt

Qt wrapper for NetworkManager API

## Solid

Hardware integration and detection

]

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## Aeroplanes

![Aeroplane](img-frameworks/airplane.png)
]

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# Tier 1

.left-column[
## KHolidays

Holiday calculation library

## KI18n

Advanced internationalization framework

]

.right-column[
## Lenny Bruce

![Lenny Bruce](img-frameworks/lenny.jpg)
]
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# Tier 1

.left-column[
## Kirigami2

QtQuick plugins to build user interfaces based on the KDE human interface guidelines

## KItemModels

Models for Qt Model/View system

## KItemViews

Widget addons for Qt Model/View

## Quick Charts

A QtQuick module providing high-performance charts.

]

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## Eye of a Hurricane

![Hurricane](img-frameworks/hurricane.jpg)
]

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# Tier 1

.left-column[
## Prison

Barcode abstraction layer providing uniform access to generation of barcodes

]

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## Listen to yourself churn

![Butter Churn](img-frameworks/churn.jpg)

]

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# Tier 1

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## KApiDox

Scripts and data for building API documentation (dox) in a standard format and style
]

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## World serves its own needs

![World](img-frameworks/earth.jpg)

]

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# Tier 1

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## ThreadWeaver

High-level multithreading framework

]

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## Speed it up a notch

![Speedometer](img-frameworks/speed.jpg)

]

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# Tier 1

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## KSyntaxHighlighting

Syntax Highlighting

## Sonnet

Support for spellchecking

]

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## Grunt

![Grunt](img-frameworks/grunt.png)
]

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# Tier 1

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##  KArchive

File compression

## KCodecs

Text encoding

]

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## Strength

![Arm](img-frameworks/arm.png)

]

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# Tier 1

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## KCoreAddons

Addons to QtCore

## KDBusAddons

Addons to QtDBus

## KGuiAddons

Addons to QtGui

## KWidgetsAddons

Addons to QtWidgets

]

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## The ladders clatter

![Ladder](img-frameworks/ladder.jpg)
]

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# Tier 1

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## KWayland

Qt-style API to interact with the wayland-client and wayland-server API

## KWindowSystem

Access to the windowing system

]

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## Wire in a fire

![Firewire](img-frameworks/fw.png)

]

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# Tier 1

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## KConfig

Configuration system

## KDNSSD

Abstraction to system DNSSD features
]

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## Wasn't coming in a hurry

![Hurriers](img-frameworks/hurry.jpg)

]

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# Tier 1

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## KIdleTime

Monitoring user activity

## KPlotting

Lightweight plotting framework

]

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## Furies breathing down your neck

![Furies](img-frameworks/fury.jpg)

]

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.. and that's just Tier 1, the little libraries.

Tiers 2, 3 and 4 build higher and further.
]

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![Slow](img-frameworks/slow.png)
]
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# KCoreAddons

## Addons to QtCore

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.
# KCoreAddons

**Still** 30 classes of awesomeness in 670kB

- About this application
 - Jobs
 - Plugins
 - System information

So let's pick just one: `KOSRelease`

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# KCoreAddons

## KOSRelease

- `/etc/os-release` is a FreeDesktop standard file
 - It describes part of the Linux system
 - Mostly *vendor* information
 - Mix of text, URLs

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# KCoreAddons

## `/etc/os-release`

```
NAME="openSUSE Tumbleweed"
# VERSION="20200107"
ID="opensuse-tumbleweed"
ID_LIKE="opensuse suse"
VERSION_ID="20200107"
PRETTY_NAME="openSUSE Tumbleweed"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:tumbleweed:20200107"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"
LOGO="distributor-logo"
```

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# KCoreAddons

## KOSRelease

Why bother?
 - Parsing the file is pretty trivial
 - Getting it right once is enough

Use it because:
 - One source of truth about the contents of `/etc/os-release`
 - Supports alternate paths
 - Also supported on FreeBSD

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# KCoreAddons

## KOSRelease

```
#include <KOSRelease>

/* Reporting a bug? */
KOSRelease r;
QUrl url( r.bugReportUrl() );

QString description = QStringLiteral( "Bug in %1 %2" )
    .arg( r.prettyName(), r.variant() );
```

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# KHolidays

Five classes, and support for all the holidays you could ever need.

![Rangoli](img-frameworks/holiday.jpg)

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# KHolidays

## LunarPhase

- Convenience functions for phase-of-the-moon
 - Another case of "get it right once"
 
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# KHolidays

## LunarPhase

- Static methods only
 - Query by (Gregorian) QDate

```
 for ( int dayOfMonth = 1; dayOfMonth <= 31; ++dayOfMonth )
 {
 QDate d( 2020, 1, dayOfMonth );
 qDebug() 
 << d 
 << KHolidays::LunarPhase::phaseNameAtDate( d );
 }
```

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# KHolidays

## LunarPhase

Why bother?
 - You rarely need the phase of the moon

Use it because:
 - There's an entire **book** written about this calculation
   (see source code)

---
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# Credits

- *End of the World as We Know It (and I feel fine)* by R.E.M.
 - *Puffin* by <a href="//commons.wikimedia.org/wiki/User:Richard_Bartz" title="User:Richard Bartz">Richard Bartz</a> - Own work, <a href="https://creativecommons.org/licenses/by-sa/3.0" title="Creative Commons Attribution-Share Alike 3.0">CC BY-SA 3.0</a>, <a href="https://commons.wikimedia.org/w/index.php?curid=27624174">Link</a>
 - *Cobra* by <a href="//commons.wikimedia.org/wiki/User:Kamalnv" title="User:Kamalnv">Kamalnv</a> - Own work, <a href="https://creativecommons.org/licenses/by/3.0" title="Creative Commons Attribution 3.0">CC BY 3.0</a>, <a href="https://commons.wikimedia.org/w/index.php?curid=5064660">Link</a>

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# Credits
 - *Churn* by <a href="//commons.wikimedia.org/wiki/User:Musphot" title="User:Musphot">Musphot</a> - Own work, <a href="https://creativecommons.org/licenses/by-sa/3.0" title="Creative Commons Attribution-Share Alike 3.0">CC BY-SA 3.0</a>, <a href="https://commons.wikimedia.org/w/index.php?curid=3651505">Link</a>
 - *Speed* by <a rel="nofollow" class="external text" href="https://www.flickr.com/people/32659528@N00">Brian Snelson</a> from Hockley, Essex, England - <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/32659528@N00/408255529/">Speedometer</a>, <a href="https://creativecommons.org/licenses/by/2.0" title="Creative Commons Attribution 2.0">CC BY 2.0</a>, <a href="https://commons.wikimedia.org/w/index.php?curid=3598465">Link</a>

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# Credits
 - *Ladder* by <a href="//commons.wikimedia.org/wiki/User:Amin" title="User:Amin">Amin</a> - Own work, <a href="https://creativecommons.org/licenses/by-sa/4.0" title="Creative Commons Attribution-Share Alike 4.0">CC BY-SA 4.0</a>, <a href="https://commons.wikimedia.org/w/index.php?curid=67182753">Link</a>
 - *Rangoli* by <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/19364701@N00">Subharnab Majumdar</a> - originally posted to <a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a> as <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/19364701@N00/2982998577">The Rangoli of Lights</a>, <a href="https://creativecommons.org/licenses/by/2.0" title="Creative Commons Attribution 2.0">CC BY 2.0</a>, <a href="https://commons.wikimedia.org/w/index.php?curid=8101819">Link</a>
 
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# There's a Framework for That!

## Seven and a Half Seconds of Fame

https://api.kde.org/frameworks/ (LGPL 2.1)