import

README.md

@@ -0,0 +1,8 @@
+Slides and demo programs for the Gophercon UK 2019 talk about [Gio](https://gioui.org/) and
+[Scatter](https://scatter.im/), "Gio: Cross Platform GUI Programming for Mobile, Desktop, WebAssembly".
+
+See the slides online [here](https://go-talks.appspot.com/github.com/eliasnaur/gophercon-uk-2019-talk/gophercon-uk-2019-live.slide).
+
+### Licence
+
+[The UNLICENCE](https://unlicense.org/)

UNLICENSE

@@ -0,0 +1,25 @@
+
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>

demo/main.go

@@ -0,0 +1,54 @@
+package main
+
+import "gioui.org/ui/app"
+import "gioui.org/ui"
+import "gioui.org/ui/layout"
+import "gioui.org/ui/gesture"
+import "gopher.con/simple"
+import "fmt"
+
+func main() {
+	go func() {
+		theme := simple.NewTheme()
+		w := app.NewWindow()
+		ops := new(ui.Ops)
+		list := layout.List{Axis: layout.Vertical}
+		btn := new(simple.IconButton)
+		n := 3
+		for e := range w.Events() {
+			switch e := e.(type) {
+			case app.UpdateEvent:
+				cfg := &e.Config
+				ops.Reset()
+				theme.Reset(cfg)
+				cs := layout.RigidConstraints(e.Size)
+
+				q := w.Queue()
+				for e, ok := btn.Next(q); ok; e, ok = btn.Next(q) {
+					if e.Type == gesture.TypeClick {
+						n += 1
+					}
+				}
+
+				for list.Init(cfg, q, ops, cs, n); list.More(); list.Next() {
+					cs := list.Constraints()
+					s := fmt.Sprintf("hello, world %d", list.Index())
+					dims := theme.Label(s, 46).Layout(ops, cs)
+					list.End(dims)
+				}
+				list.Layout()
+
+				align := layout.Align{Alignment: layout.SE}
+				cs = align.Begin(ops, cs)
+				margins := layout.UniformInset(ui.Dp(8))
+				cs = margins.Begin(cfg, ops, cs)
+				dims := btn.Layout(cfg, ops, cs)
+				dims = margins.End(dims)
+				align.End(dims)
+
+				w.Update(ops)
+			}
+		}
+	}()
+	app.Main()
+}

go.mod

@@ -0,0 +1,9 @@
+module gopher.con
+
+go 1.13
+
+require (
+	gioui.org/ui v0.0.0-20190822151904-b34389ac2cf9
+	golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56
+	golang.org/x/image v0.0.0-20190703141733-d6a02ce849c9
+)

go.sum

@@ -0,0 +1,21 @@
+gioui.org/ui v0.0.0-20190822151904-b34389ac2cf9 h1:sM1vb0wEkZKjFsi6y6lBhjOAcf6hNlEdLSjfpTIcPqI=
+gioui.org/ui v0.0.0-20190822151904-b34389ac2cf9/go.mod h1:dmqi7kyK1sZ03VAkEqzKKpKWfRPCuqrd1eDtSqyhjzY=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56 h1:estk1glOnSVeJ9tdEZZc5mAMDZk5lNJNyJ6DvrBkTEU=
+golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56/go.mod h1:JhuoJpWY28nO4Vef9tZUw9qufEGTyX1+7lmHxV5q5G4=
+golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
+golang.org/x/image v0.0.0-20190703141733-d6a02ce849c9 h1:uc17S921SPw5F2gJo7slQ3aqvr2RwpL7eb3+DZncu3s=
+golang.org/x/image v0.0.0-20190703141733-d6a02ce849c9/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
+golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=

gophercon-uk-2019-live.slide

@@ -0,0 +1,75 @@
+Gio: Cross Platform GUI Programming
+Gophercon UK 2019
+
+Elias Naur
+mail@eliasnaur.com
+@elias_naur
+https://gioui.org
+https://scatter.im
+
+* Background
+
+* Background
+
+- [[https://groups.google.com/forum/#!topic/golang-nuts/OSD91zz2TgQ]["[ANN] Write Android apps in Go"]] - June, 2013
+- [[https://github.com/golang/mobile/commit/d3521b7338121e39da67b21ea7d8942d3b47942e][First gomobile commit]] - July, 2014
+- [[https://www.youtube.com/watch?v=QfFwceFo97E][dotGo talk introducing reverse bindings]] - October, 2016
+- First (private) Gio commit - October, 2017
+- [[https://groups.google.com/forum/#!topic/golang-nuts/H4us4194WQ4][Public release of Gio]] - March, 2019
+
+: * Background
+
+: .image tribaltrouble.jpg 470 _
+
+: * Introduction
+
+: Gio - [[https://gioui.org][https://gioui.org]]
+
+: Gio is a simple Go module for writing portable and fast graphical interfaces.
+
+
+
+* Gio
+
+[[https://gioui.org][https://gioui.org]]
+
+Features
+
+- Immediate mode design.
+- Only depends on lowest-level platform libraries.
+- GPU accelerated vector and text rendering.
+- No garbage generated in drawing or layout code.
+- Cross platform (macOS, Linux, Windows, Android, iOS, tvOS, Webassembly).
+- Core is 100% Go. OS-specific native interfaces are optional.
+
+
+* Scatter
+
+
+* Scatter
+
+- [[https://scatter.im][https://scatter.im]]
+
+In app stores
+
+- [[https://play.google.com/apps/testing/im.scatter.app][Android Play Store Beta]]
+- [[https://testflight.apple.com/join/jsGgyJvC][iOS TestFlight]]
+
+
+* Demo
+
+* The gio tool
+
+* Why Gio?
+
+
+
+* Why Gio?
+
+Gio is
+
+- Simple. Immediate mode design, no hidden state.
+- Portable. Runs on the desktop, mobile and browser.
+- Fast. GPU accelerated, very little per-frame garbage.
+- Public domain source (UNLICENCE). Dual licenced MIT if you prefer that.
+

programs/webassembly.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"os"
+)
+
+func main() {
+	err := http.ListenAndServe(":8080", http.FileServer(http.Dir(os.Args[1])))
+	log.Fatal(err)
+}