gotk3 [](https://godoc.org/github.com/gotk3/gotk3)
=====
[](https://travis-ci.org/gotk3/gotk3)
The gotk3 project provides Go bindings for GTK+3 and dependent
projects. Each component is given its own subdirectory, which is used
as the import path for the package. Partial binding support for the
following libraries is currently implemented:
- GTK+3 (3.12 and later)
- GDK 3 (3.12 and later)
- GLib 2 (2.36 and later)
- Cairo (1.10 and later)
Care has been taken for memory management to work seamlessly with Go's
garbage collector without the need to use or understand GObject's
floating references.
## Sample Use
The following example can be found in [Examples](https://github.com/gotk3/gotk3-examples/).
```Go
package main
import (
"github.com/gotk3/gotk3/gtk"
"log"
)
func main() {
// Initialize GTK without parsing any command line arguments.
gtk.Init(nil)
// Create a new toplevel window, set its title, and connect it to the
// "destroy" signal to exit the GTK main loop when it is destroyed.
win, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
if err != nil {
log.Fatal("Unable to create window:", err)
}
win.SetTitle("Simple Example")
win.Connect("destroy", func() {
gtk.MainQuit()
})
// Create a new label widget to show in the window.
l, err := gtk.LabelNew("Hello, gotk3!")
if err != nil {
log.Fatal("Unable to create label:", err)
}
// Add the label to the window.
win.Add(l)
// Set the default window size.
win.SetDefaultSize(800, 600)
// Recursively show all widgets contained in this window.
win.ShowAll()
// Begin executing the GTK main loop. This blocks until
// gtk.MainQuit() is run.
gtk.Main()
}
```
To build the example:
```shell
$ go build example.go
```
To build this example with older gtk version you should use gtk_3_10 tag:
```shell
$ go build -tags gtk_3_10 example.go
```
### Example usage
```Go
package main
import (
"log"
"os"
"github.com/gotk3/gotk3/glib"
"github.com/gotk3/gotk3/gtk"
)
// Simple Gtk3 Application written in go.
// This application creates a window on the application callback activate.
// More GtkApplication info can be found here -> https://wiki.gnome.org/HowDoI/GtkApplication
func main() {
// Create Gtk Application, change appID to your application domain name reversed.
const appID = "org.gtk.example"
application, err := gtk.ApplicationNew(appID, glib.APPLICATION_FLAGS_NONE)
// Check to make sure no errors when creating Gtk Application
if err != nil {
log.Fatal("Could not create application.", err)
}
// Application signals available
// startup -> sets up the application when it first starts
// activate -> shows the default first window of the application (like a new document). This corresponds to the application being launched by the desktop environment.
// open -> opens files and shows them in a new window. This corresponds to someone trying to open a document (or documents) using the application from the file browser, or similar.
// shutdown -> performs shutdown tasks
// Setup Gtk Application callback signals
application.Connect("activate", func() { onActivate(application) })
// Run Gtk application
os.Exit(application.Run(os.Args))
}
// Callback signal from Gtk Application
func onActivate(application *gtk.Application) {
// Create ApplicationWindow
appWindow, err := gtk.ApplicationWindowNew(application)
if err != nil {
log.Fatal("Could not create application window.", err)
}
// Set ApplicationWindow Properties
appWindow.SetTitle("Basic Application.")
appWindow.SetDefaultSize(400, 400)
appWindow.Show()
}
```
```Go
package main
import (
"log"
"os"
"github.com/gotk3/gotk3/glib"
"github.com/gotk3/gotk3/gtk"
)
// Simple Gtk3 Application written in go.
// This application creates a window on the application callback activate.
// More GtkApplication info can be found here -> https://wiki.gnome.org/HowDoI/GtkApplication
func main() {
// Create Gtk Application, change appID to your application domain name reversed.
const appID = "org.gtk.example"
application, err := gtk.ApplicationNew(appID, glib.APPLICATION_FLAGS_NONE)
// Check to make sure no errors when creating Gtk Application
if err != nil {
log.Fatal("Could not create application.", err)
}
// Application signals available
// startup -> sets up the application when it first starts
// activate -> shows the default first window of the application (like a new document). This corresponds to the application being launched by the desktop environment.
// open -> opens files and shows them in a new window. This corresponds to someone trying to open a document (or documents) using the application from the file browser, or similar.
// shutdown -> performs shutdown tasks
// Setup activate signal with a closure function.
application.Connect("activate", func() {
// Create ApplicationWindow
appWindow, err := gtk.ApplicationWindowNew(application)
if err != nil {
log.Fatal("Could not create application window.", err)
}
// Set ApplicationWindow Properties
appWindow.SetTitle("Basic Application.")
appWindow.SetDefaultSize(400, 400)
appWindow.Show()
})
// Run Gtk application
application.Run(os.Args)
}
```
## Documentation
Each package's internal `go doc` style documentation can be viewed
online without installing this package by using the GoDoc site (links
to [cairo](http://godoc.org/github.com/gotk3/gotk3/cairo),
[glib](http://godoc.org/github.com/gotk3/gotk3/glib),
[gdk](http://godoc.org/github.com/gotk3/gotk3/gdk), and
[gtk](http://godoc.org/github.com/gotk3/gotk3/gtk) documentation).
You can also view the documentation locally once the package is
installed with the `godoc` tool by running `godoc -http=":6060"` and
pointing your browser to
http://localhost:6060/pkg/github.com/gotk3/gotk3
## Installation
gotk3 currently requires GTK 3.6-3.22, GLib 2.36-2.40, and
Cairo 1.10 or 1.12. A recent Go (1.8 or newer) is also required.
For detailed instructions see the wiki pages: [installation](https://github.com/gotk3/gotk3/wiki#installation)
## TODO
- Add bindings for all of GTK+
- Add tests for each implemented binding
## License
Package gotk3 is licensed under the liberal ISC License.
Actually if you use gotk3, then gotk3 is statically linked into your application (with the ISC licence).
The system libraries (e.g. GTK+, GLib) used via cgo use dynamic linking.