wartank/vendor/fyne.io/fyne/v2

About

Fyne is an easy-to-use UI toolkit and app API written in Go. It is designed to build applications that run on desktop and mobile devices with a single codebase.

Version 2.3 is the current release of the Fyne API, it added a refined theme design, cloud storage, improved text handling for international languages and many smaller feature additions. We are now working towards the next big release, codenamed Dalwhinnie and more news will follow in our news feeds and GitHub project.

Prerequisites

To develop apps using Fyne you will need Go version 1.14 or later, a C compiler and your system's development tools. If you're not sure if that's all installed or you don't know how then check out our Getting Started document.

Using the standard go tools you can install Fyne's core library using:

go get fyne.io/fyne/v2

After importing a new module, run the following command before compiling the code for the first time. Avoid running it before writing code that uses the module to prevent accidental removal of dependencies:

go mod tidy

Widget demo

To run a showcase of the features of Fyne execute the following:

go install fyne.io/fyne/v2/cmd/fyne_demo@latest
fyne_demo

And you should see something like this (after you click a few buttons):

Or if you are using the light theme:

And even running on a mobile device:

Getting Started

Fyne is designed to be really easy to code with. If you have followed the prerequisite steps above then all you need is a Go IDE (or a text editor).

Open a new file and you're ready to write your first app!

package main

import (
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/widget"
)

func main() {
	a := app.New()
	w := a.NewWindow("Hello")

	hello := widget.NewLabel("Hello Fyne!")
	w.SetContent(container.NewVBox(
		hello,
		widget.NewButton("Hi!", func() {
			hello.SetText("Welcome :)")
		}),
	))

	w.ShowAndRun()
}

And you can run that simply as:

go run main.go

It should look like this:

Note that Windows applications load from a command prompt by default, which means if you click an icon you may see a command window. To fix this add the parameters -ldflags -H=windowsgui to your run or build commands.

Run in mobile simulation

There is a helpful mobile simulation mode that gives a hint of how your app would work on a mobile device:

go run -tags mobile main.go

Another option is to use fyne command, see Packaging for mobile.

Installing

Using go install will copy the executable into your go bin dir. To install the application with icons etc into your operating system's standard application location you can use the fyne utility and the "install" subcommand.

go install fyne.io/fyne/v2/cmd/fyne@latest
fyne install

Packaging for mobile

To run on a mobile device it is necessary to package up the application. To do this we can use the fyne utility "package" subcommand. You will need to add appropriate parameters as prompted, but the basic command is shown below. Once packaged you can install using the platform development tools or the fyne "install" subcommand.

fyne package -os android -appID my.domain.appname
fyne install -os android

The built Android application can run either in a real device or an Android emulator. However, building for iOS is slightly different. If the "-os" argument is "ios", it is build only for a real iOS device. Specify "-os" to "iossimulator" allows the application be able to run in an iOS simulator:

fyne package -os ios -appID my.domain.appname
fyne package -os iossimulator -appID my.domain.appname

Preparing a release

Using the fyne utility "release" subcommand you can package up your app for release to app stores and market places. Make sure you have the standard build tools installed and have followed the platform documentation for setting up accounts and signing. Then you can execute something like the following, notice the -os ios parameter allows building an iOS app from macOS computer. Other combinations work as well :)

$ fyne release -os ios -certificate "Apple Distribution" -profile "My App Distribution" -appID "com.example.myapp"

The above command will create a '.ipa' file that can then be uploaded to the iOS App Store.

Documentation

More documentation is available at the Fyne developer website or on pkg.go.dev.

Examples

You can find many example applications in the examples repository. Alternatively a list of applications using fyne can be found at our website.

Shipping the Fyne Toolkit

All Fyne apps will work without pre-installed libraries, this is one reason the apps are so portable. However, if looking to support Fyne in a bigger way on your operating system then you can install some utilities that help to make a more complete experience.

Additional apps

It is recommended that you install the following additional apps:

app	go install	description
fyne_settings	fyne.io/fyne/v2/cmd/fyne_settings	A GUI for managing your global Fyne settings like theme and scaling
apps	github.com/fyne-io/apps	A graphical installer for the Fyne apps listed at https://apps.fyne.io

These are optional applications but can help to create a more complete desktop experience.

FyneDesk (Linux / BSD)

To go all the way with Fyne on your desktop / laptop computer you could install FyneDesk as well :)