Go bindings for GTK3
Go C C++
Clone or download
andre-hub Merge pull request #282 from bit101/master
Implement cairo context matrix
Latest commit 5bd78e5 Aug 5, 2018

README.md

gotk3 GoDoc

Build Status

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.

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:

$ go build example.go

To build this example with older gtk version you should use gtk_3_10 tag:

$ go build -tags gtk_3_10 example.go

examples for gtk3

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()
}
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, glib, gdk, and 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 3.6-3.16, GLib 2.36-2.40, and Cairo 1.10 or 1.12. A recent Go (1.3 or newer) is also required.

For detailed instructions see the wiki pages: installation

TODO

  • Add bindings for all of GTK+
  • Add tests for each implemented binding

License

Package gotk3 is licensed under the liberal ISC License.