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()
}
// Setup the Window.
func setupWindow() *gtk.Window {
w, _ := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
w.Connect("destroy", gtk.MainQuit)
w.SetDefaultSize(500, 300)
w.SetPosition(gtk.WIN_POS_CENTER)
w.SetTitle("TextView properties example")
return w
}
func main() {
gtk.Init(nil)
win, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
if err != nil {
log.Fatal("Unable to create window:", err)
}
win.Connect("destroy", func() {
gtk.MainQuit()
})
win.Add(windowWidget())
// Native GTK is not thread safe, and thus, gotk3's GTK bindings may not
// be used from other goroutines. Instead, glib.IdleAdd() must be used
// to add a function to run in the GTK main loop when it is in an idle
// state.
//
// Two examples of using glib.IdleAdd() are shown below. The first runs
// a user created function, LabelSetTextIdle, and passes it two
// arguments for a label and the text to set it with. The second calls
// (*gtk.Label).SetText directly, passing in only the text as an
// argument.
//
// If the function passed to glib.IdleAdd() returns one argument, and
// that argument is a bool, this return value will be used in the same
// manner as a native g_idle_add() call. If this return value is false,
// the function will be removed from executing in the GTK main loop's
// idle state. If the return value is true, the function will continue
// to execute when the GTK main loop is in this state.
go func() {
for {
time.Sleep(time.Second)
s := fmt.Sprintf("Set a label %d time(s)!", nSets)
_, err := glib.IdleAdd(LabelSetTextIdle, topLabel, s)
if err != nil {
log.Fatal("IdleAdd() failed:", err)
}
nSets++
s = fmt.Sprintf("Set a label %d time(s)!", nSets)
_, err = glib.IdleAdd(bottomLabel.SetText, s)
if err != nil {
log.Fatal("IdleAdd() failed:", err)
}
nSets++
}
}()
win.ShowAll()
gtk.Main()
}
// Create and initialize the window
func setupWindow(title string) *gtk.Window {
win, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
if err != nil {
log.Fatal("Unable to create window:", err)
}
win.SetTitle(title)
win.Connect("destroy", func() {
gtk.MainQuit()
})
win.SetPosition(gtk.WIN_POS_CENTER)
win.SetDefaultSize(600, 300)
return win
}
func main() {
gtk.Init(nil)
win, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
if err != nil {
log.Fatal("Unable to create window:", err)
}
win.Connect("destroy", func() {
gtk.MainQuit()
})
win.Add(windowWidget())
win.ShowAll()
gtk.Main()
}
func main() {
gtk.Init(nil)
// gui boilerplate
win, _ := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
da, _ := gtk.DrawingAreaNew()
win.Add(da)
win.SetTitle("Arrow keys")
win.Connect("destroy", gtk.MainQuit)
win.ShowAll()
// Data
unitSize := 20.0
x := 0.0
y := 0.0
keyMap := map[uint]func(){
KEY_LEFT: func() { x-- },
KEY_UP: func() { y-- },
KEY_RIGHT: func() { x++ },
KEY_DOWN: func() { y++ },
}
// Event handlers
da.Connect("draw", func(da *gtk.DrawingArea, cr *cairo.Context) {
cr.SetSourceRGB(0, 0, 0)
cr.Rectangle(x*unitSize, y*unitSize, unitSize, unitSize)
cr.Fill()
})
win.Connect("key-press-event", func(win *gtk.Window, ev *gdk.Event) {
keyEvent := &gdk.EventKey{ev}
if move, found := keyMap[keyEvent.KeyVal()]; found {
move()
win.QueueDraw()
}
})
gtk.Main()
}
func main() {
gtk.Init(nil)
win, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
if err != nil {
log.Fatal("Unable to create window:", err)
}
win.SetTitle("Grid Example")
win.Connect("destroy", func() {
gtk.MainQuit()
})
// Create a new grid widget to arrange child widgets
grid, err := gtk.GridNew()
if err != nil {
log.Fatal("Unable to create grid:", err)
}
// gtk.Grid embeds an Orientable struct to simulate the GtkOrientable
// GInterface. Set the orientation from the default horizontal to
// vertical.
grid.SetOrientation(gtk.ORIENTATION_VERTICAL)
// Create some widgets to put in the grid.
lab, err := gtk.LabelNew("Just a label")
if err != nil {
log.Fatal("Unable to create label:", err)
}
btn, err := gtk.ButtonNewWithLabel("Button with label")
if err != nil {
log.Fatal("Unable to create button:", err)
}
entry, err := gtk.EntryNew()
if err != nil {
log.Fatal("Unable to create entry:", err)
}
spnBtn, err := gtk.SpinButtonNewWithRange(0.0, 1.0, 0.001)
if err != nil {
log.Fatal("Unable to create spin button:", err)
}
nb, err := gtk.NotebookNew()
if err != nil {
log.Fatal("Unable to create notebook:", err)
}
// Calling (*gtk.Container).Add() with a gtk.Grid will add widgets next
// to each other, in the order they were added, to the right side of the
// last added widget when the grid is in a horizontal orientation, and
// at the bottom of the last added widget if the grid is in a vertial
// orientation. Using a grid in this manner works similar to a gtk.Box,
// but unlike gtk.Box, a gtk.Grid will respect its child widget's expand
// and margin properties.
grid.Add(btn)
grid.Add(lab)
grid.Add(entry)
grid.Add(spnBtn)
// Widgets may also be added by calling (*gtk.Grid).Attach() to specify
// where to place the widget in the grid, and optionally how many rows
// and columns to span over.
//
// Additional rows and columns are automatically added to the grid as
// necessary when new widgets are added with (*gtk.Container).Add(), or,
// as shown in this case, using (*gtk.Grid).Attach().
//
// In this case, a notebook is added beside the widgets inserted above.
// The notebook widget is inserted with a left position of 1, a top
// position of 1 (starting at the same vertical position as the button),
// a width of 1 column, and a height of 2 rows (spanning down to the
// same vertical position as the entry).
//
// This example also demonstrates how not every area of the grid must
// contain a widget. In particular, the area to the right of the label
// and the right of spin button have contain no widgets.
grid.Attach(nb, 1, 1, 1, 2)
nb.SetHExpand(true)
nb.SetVExpand(true)
// Add a child widget and tab label to the notebook so it renders.
nbChild, err := gtk.LabelNew("Notebook content")
if err != nil {
log.Fatal("Unable to create button:", err)
}
nbTab, err := gtk.LabelNew("Tab label")
if err != nil {
log.Fatal("Unable to create label:", err)
}
nb.AppendPage(nbChild, nbTab)
// Add the grid to the window, and show all widgets.
win.Add(grid)
win.ShowAll()
gtk.Main()
}