User input/Graphical: Difference between revisions

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 '''[http://cogier.com/gambas/User_input-Graphical.png Click here for a picture of the running program]'''
+=={{header|Go}}==
+{{libheader|gotk3}}
+<lang go>package main
+import (
+    "github.com/gotk3/gotk3/gtk"
+    "log"
+    "math/rand"
+    "strconv"
+    "time"
+)
+func validateInput(window *gtk.Window, str1, str2 string) bool {
+    n, err := strconv.ParseFloat(str2, 64)
+    if len(str1) == 0 || err != nil || n != 75000 {
+        dialog := gtk.MessageDialogNew(
+            window,
+            gtk.DIALOG_MODAL,
+            gtk.MESSAGE_ERROR,
+            gtk.BUTTONS_OK,
+            "Invalid input",
+        )
+        dialog.Run()
+        dialog.Destroy()
+        return false
+    }
+    return true
+}
+func check(err error, msg string) {
+    if err != nil {
+        log.Fatal(msg, err)
+    }
+}
+func main() {
+    rand.Seed(time.Now().UnixNano())
+    gtk.Init(nil)
+    window, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
+    check(err, "Unable to create window:")
+    window.SetTitle("Rosetta Code")
+    window.SetPosition(gtk.WIN_POS_CENTER)
+    window.Connect("destroy", func() {
+        gtk.MainQuit()
+    })
+    vbox, err := gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 1)
+    check(err, "Unable to create vertical box:")
+    vbox.SetBorderWidth(1)
+    hbox1, err := gtk.BoxNew(gtk.ORIENTATION_HORIZONTAL, 1)
+    check(err, "Unable to create first horizontal box:")
+    hbox2, err := gtk.BoxNew(gtk.ORIENTATION_HORIZONTAL, 1)
+    check(err, "Unable to create second horizontal box:")
+    label, err := gtk.LabelNew("Enter a string and the number 75000   \n")
+    check(err, "Unable to create label:")
+    sel, err := gtk.LabelNew("String:      ")
+    check(err, "Unable to create string entry label:")
+    nel, err := gtk.LabelNew("Number: ")
+    check(err, "Unable to create number entry label:")
+    se, err := gtk.EntryNew()
+    check(err, "Unable to create string entry:")
+    ne, err := gtk.EntryNew()
+    check(err, "Unable to create number entry:")
+    hbox1.PackStart(sel, false, false, 2)
+    hbox1.PackStart(se, false, false, 2)
+    hbox2.PackStart(nel, false, false, 2)
+    hbox2.PackStart(ne, false, false, 2)
+    // button to accept
+    ab, err := gtk.ButtonNewWithLabel("Accept")
+    check(err, "Unable to create accept button:")
+    ab.Connect("clicked", func() {
+        // read and validate the entered values
+        str1, _ := se.GetText()
+        str2, _ := ne.GetText()
+        if validateInput(window, str1, str2) {
+            window.Destroy() // close window if input is OK
+        }
+    })
+    vbox.Add(label)
+    vbox.Add(hbox1)
+    vbox.Add(hbox2)
+    vbox.Add(ab)
+    window.Add(vbox)
+    window.ShowAll()
+    gtk.Main()
+}</lang>
 =={{header|Groovy}}==