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About Walk
==========
Walk is a "Windows Application Library Kit" for the Go Programming Language.
Its primarily useful for Desktop GUI development, but there is some more stuff.
Setup
=====
Make sure you have a working Go installation.
See [Getting Started](http://golang.org/doc/install.html)
##### Note
`Go 1.7.x` doesn't work with walk anymore, Make sure you use `Go 1.8.x` or later.
##### To Install
Now run `go get github.com/lxn/walk`
Using Walk
==========
The preferred way to create GUIs with Walk is to use its declarative sub package,
as illustrated in this small example:
##### `test.go`
```go
package main
import (
"github.com/lxn/walk"
. "github.com/lxn/walk/declarative"
"strings"
)
func main() {
var inTE, outTE *walk.TextEdit
MainWindow{
Title: "SCREAMO",
MinSize: Size{600, 400},
Layout: VBox{},
Children: []Widget{
HSplitter{
Children: []Widget{
TextEdit{AssignTo: &inTE},
TextEdit{AssignTo: &outTE, ReadOnly: true},
},
},
PushButton{
Text: "SCREAM",
OnClicked: func() {
outTE.SetText(strings.ToUpper(inTE.Text()))
},
},
},
}.Run()
}
```
##### Create Manifest `test.manifest`
```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
<assemblyIdentity version="1.0.0.0" processorArchitecture="*" name="SomeFunkyNameHere" type="win32"/>
<dependency>
<dependentAssembly>
<assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/>
</dependentAssembly>
</dependency>
<asmv3:application>
<asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
<dpiAware>true</dpiAware>
</asmv3:windowsSettings>
</asmv3:application>
</assembly>
```
Then either compile the manifest using the [rsrc tool](https://github.com/akavel/rsrc), like this:
go get github.com/akavel/rsrc
rsrc -manifest test.manifest -o rsrc.syso
or rename the `test.manifest` file to `test.exe.manifest` and distribute it with the application instead.
##### Build app
In the directory containing `test.go` run
go build
To get rid of the cmd window, instead run
go build -ldflags="-H windowsgui"
##### Run app
test.exe
##### Sample Output (Windows 7)
##### More Examples
There are some [examples](examples) that should get you started.
Application Manifest Files
==========================
Walk requires Common Controls 6. This means that you must put an appropriate
application manifest file either next to your executable or embedded as a
resource.
You can copy one of the application manifest files that come with the examples.
To embed a manifest file as a resource, you can use the [rsrc tool](https://github.com/akavel/rsrc).
IMPORTANT: If you don't embed a manifest as a resource, then you should not launch
your executable before the manifest file is in place.
If you do anyway, the program will not run properly. And worse, Windows will not
recognize a manifest file, you later drop next to the executable. To fix this,
rebuild your executable and only launch it with a manifest file in place.
Program Crashes
===============
By default Go uses os threads with small stack sizes of 128KB. If your walk app crashes, it may be due
to a stack overflow. Until a [better solution is found](https://github.com/golang/go/issues/20975),
you can work around this by adding
import _ "runtime/cgo"
somewhere in your program. If you don't have `gcc` installed and on your `PATH`,
you can alternatively add `-linkmode internal` to the `-ldflags` of your `go build` command like so:
go build -ldflags="-H windowsgui -linkmode internal"
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