Golang : GTK Input dialog box examples

Here are some simplified examples on how to create input dialog box with GTK and Golang. Basically, what each programs does, is to invoke an empty dialog box and insert an input field or dropdown selection into the dialog box.

Below is the simplest way to get user input with GTK and Golang.

 package main

 import (
  "fmt"
  "github.com/mattn/go-gtk/glib"
  "github.com/mattn/go-gtk/gtk"
 )

 func main() {
  gtk.Init(nil)

  window := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
  window.SetPosition(gtk.WIN_POS_CENTER)
  window.SetTitle("GTK Go Input Dialog example!")
  window.SetIconName("gtk-dialog-info")
  window.Connect("destroy", func(ctx *glib.CallbackContext) {
 println("got destroy!", ctx.Data().(string))
 gtk.MainQuit()
  }, "Happy coding!")

  dialog := gtk.NewDialog()
  dialog.SetTitle("User input")

  vbox := dialog.GetVBox()

  label := gtk.NewLabel("Enter some characters here :")
  vbox.Add(label)

  input := gtk.NewEntry()
  input.SetEditable(true)
  vbox.Add(input)

  button := gtk.NewButtonWithLabel("OK")
  button.Connect("clicked", func() {
 fmt.Println("Input : ", input.GetText())
 //gtk.MainQuit()
  })

  vbox.Add(button)

  quitButton := gtk.NewButtonWithLabel("Quit")
  quitButton.Connect("clicked", func() {
 fmt.Println("Quiting now ...")
 gtk.MainQuit()
  })

  vbox.Add(quitButton)

  dialog.ShowAll()
  window.Add(dialog)
  gtk.Main()
 }

To set the input field initial value, use the SetText() function. See comment below.

 package main

 import (
  "fmt"
  "github.com/mattn/go-gtk/glib"
  "github.com/mattn/go-gtk/gtk"
 )

 func main() {
  gtk.Init(nil)

  window := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
  window.SetPosition(gtk.WIN_POS_CENTER)
  window.SetTitle("GTK Go Input Dialog example!")
  window.SetIconName("gtk-dialog-info")
  window.Connect("destroy", func(ctx *glib.CallbackContext) {
 println("got destroy!", ctx.Data().(string))
 gtk.MainQuit()
  }, "Happy coding!")

  dialog := gtk.NewDialog()
  dialog.SetTitle("User input")

  vbox := dialog.GetVBox()

  label := gtk.NewLabel("Enter some characters here :")
  vbox.Add(label)

  input := gtk.NewEntry()
  input.SetEditable(true)
  input.SetText("Initial value 123") // <--- set initiate value
  fmt.Println("Set initial value 123")
  vbox.Add(input)

  button := gtk.NewButtonWithLabel("OK")
  button.Connect("clicked", func() {
 fmt.Println("Input : ", input.GetText())
 //gtk.MainQuit()
  })

  vbox.Add(button)

  quitButton := gtk.NewButtonWithLabel("Quit")
  quitButton.Connect("clicked", func() {
 fmt.Println("Quiting now ...")
 gtk.MainQuit()
  })

  vbox.Add(quitButton)

  dialog.ShowAll()
  window.Add(dialog)
  gtk.Main()
 }

Apart from input with string value, you can select a predefined values as well. Here is an example of how to create drop down and select input dialog box

 package main

 import (
 "fmt"
 "github.com/mattn/go-gtk/glib"
 "github.com/mattn/go-gtk/gtk"
 )

 func main() {
 gtk.Init(nil)

 window := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
 window.SetPosition(gtk.WIN_POS_CENTER)
 window.SetTitle("GTK Go Input Dialog example!")
 window.SetIconName("gtk-dialog-info")
 window.Connect("destroy", func(ctx *glib.CallbackContext) {
 println("got destroy!", ctx.Data().(string))
 gtk.MainQuit()
 }, "Happy coding!")

 dialog := gtk.NewDialog()
 dialog.SetTitle("User input")

 vbox := dialog.GetVBox()

 combos := gtk.NewHBox(false, 1)
 combobox := gtk.NewComboBoxNewText()
 combobox.AppendText("Yes")
 combobox.AppendText("No")
 combobox.SetActive(0) // yes
 combobox.Connect("changed", func() {
 fmt.Println("value:", combobox.GetActiveText())

 if combobox.GetActiveText() == "Yes" {
 fmt.Println("Yes")
 } else {
 fmt.Println("No")
 }
 })
 combos.Add(combobox)
 vbox.Add(combos)

 quitButton := gtk.NewButtonWithLabel("Quit")
 quitButton.Connect("clicked", func() {
 fmt.Println("Quiting now ...")
 gtk.MainQuit()
 })

 vbox.Add(quitButton)

 dialog.ShowAll()
 dialog.SetSizeRequest(400, 50)
 window.Add(dialog)

 gtk.Main()
 }