Gio implements portable immediate mode GUI programs in Go. Gio programs run on all the major platforms: iOS/tvOS, Android, Linux (Wayland), macOS, Windows and browsers (Webassembly/WebGL).
Gio includes an efficient vector renderer based on the Pathfinder project (https://github.com/pcwalton/pathfinder). Text and other shapes are rendered using only their outlines without baking them into texture images, to support efficient animations, transformed drawing and pixel resolution independence.
Gio is designed to work with very few dependencies. It depends only on the platform libraries for window management, input and GPU drawing.
With Go 1.12 or newer,
$ export GO111MODULE=on $ go run gioui.org/apps/hello
should display a simple message in a window.
$ go run gioui.org/apps/gophers
runs a simple (nonsense) demo that displays Go contributors fetched from GitHub.
If you run into quota issues, supply a
$ go run gioui.org/apps/gophers -token <github token>
For Android, iOS, tvOS the
gio tool can build and package a Gio program for you.
To build an Android .apk file from the
$ go run gioui.org/cmd/gio -target android gioui.org/apps/gophers
The apk can be installed to a running emulator or attached device with adb:
$ adb install gophers.apk
The gio tool passes command line arguments to os.Args at runtime:
$ go run gioui.org/cmd/gio -target android gioui.org/apps/gophers -token <github token>
-appid flag specifies the iOS bundle id or Android package id. The flag is required
for creating signed .ipa files for iOS and tvOS devices, because the bundle id must match an id
previously provisioned in Xcode. For example,
$ go run gioui.org/cmd/gio -target ios -appid <bundle-id> gioui.org/apps/gophers
Window->Devices and Simulators option in Xcode to install the ipa file to the device.
If you have ideviceinstaller installed,
you can install the app from the command line:
$ ideviceinstaller -i gophers.ipa
If you just want to run a program on the iOS simulator, use the
-o flag to specify a .app
$ go run gioui.org/cmd/gio/ -o gophers.app -target ios gioui.org/apps/gophers
Install the app to a running simulator with simctl:
$ xcrun simctl install booted gophers.app
To run a Gio program in a compatible browser, the
gio tool can output a directory ready to
serve. With the
goxec tool you don't even need a web server:
$ go run gioui.org/cmd/gio -target js gioui.org/apps/gophers $ go get github.com/shurcooL/goexec $ goexec 'http.ListenAndServe(":8080", http.FileServer(http.Dir("gophers")))'
Open http://localhost:8080 in a browser to run the program.
See the integration guide for details on using Gio with existing projects.
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See the contribution guide for more details.
Dual-licensed under UNLICENSE or the MIT.