func NewInput(X *xgbutil.XUtil, theme *InputTheme, config InputConfig) *Input {
input := &Input{
X: X,
theme: theme,
config: config,
showing: false,
do: nil,
history: make([]string, 0, 100),
}
// Create all windows used for the base of the input prompt.
cwin := func(p xproto.Window) *xwindow.Window {
return xwindow.Must(xwindow.Create(X, p))
}
input.win = cwin(X.RootWin())
input.label = cwin(input.win.Id)
input.input = text.NewInput(X, input.win.Id, 1000, theme.Padding,
theme.Font, theme.FontSize, theme.FontColor, theme.BgColor)
input.bInp = cwin(input.win.Id)
input.bTop, input.bBot = cwin(input.win.Id), cwin(input.win.Id)
input.bLft, input.bRht = cwin(input.win.Id), cwin(input.win.Id)
// Make the top-level window override redirect so the window manager
// doesn't mess with us.
input.win.Change(xproto.CwOverrideRedirect, 1)
input.win.Listen(xproto.EventMaskFocusChange)
input.input.Listen(xproto.EventMaskKeyPress)
// Colorize the windows.
cclr := func(w *xwindow.Window, clr render.Color) {
w.Change(xproto.CwBackPixel, clr.Uint32())
}
cclr(input.win, input.theme.BgColor)
cclr(input.bInp, input.theme.BorderColor)
cclr(input.bTop, input.theme.BorderColor)
cclr(input.bBot, input.theme.BorderColor)
cclr(input.bLft, input.theme.BorderColor)
cclr(input.bRht, input.theme.BorderColor)
// Map the sub-windows once.
input.label.Map()
input.input.Map()
input.bInp.Map()
input.bTop.Map()
input.bBot.Map()
input.bLft.Map()
input.bRht.Map()
// Connect the key response handler.
// The handler is responsible for tab completion and quitting if the
// cancel key has been pressed.
input.keyResponse().Connect(X, input.input.Id)
input.focusResponse().Connect(X, input.win.Id)
return input
}
func main() {
X, err := xgbutil.NewConn()
fatal(err)
// Remember to always initialize the keybind package before usage.
keybind.Initialize(X)
// We create a benign parent window. Its only value in this example is
// instructional. In particular, it shows how to have a sub-window get
// focus using the ICCCM WM_TAKE_FOCUS protocol. (Since by default,
// the window manager will assign focus to your top-level window.)
// The real magic happens below with the WMTakeFocus method call.
parentWin, err := xwindow.Create(X, X.RootWin())
fatal(err)
// NewInput creates a new input window and handles all of the text drawing
// for you. It can be any width, but the height will be automatically
// determined by the height extents of the font size chosen.
input := text.NewInput(X, parentWin.Id, width, padding, font, fontSize,
fontColor, bgColor)
parentWin.Resize(input.Geom.Width(), input.Geom.Height())
// Make sure X reports KeyPress events when this window is focused.
input.Listen(xproto.EventMaskKeyPress)
// Listen to KeyPress events. If it's a BackSpace, remove the last
// character in the input box. If it's "Return" quit. If it's "Escape",
// clear the input box.
// Otherwise, try to add the key pressed to the input box.
// (Not all key presses correspond to a single character that is added.)
xevent.KeyPressFun(
func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
mods, kc := ev.State, ev.Detail
switch {
case keybind.KeyMatch(X, "BackSpace", mods, kc):
input.Remove()
case keybind.KeyMatch(X, "Return", mods, kc):
log.Println("Return has been pressed.")
log.Printf("The current text is: %s", string(input.Text))
log.Println("Quitting...")
xevent.Quit(X)
case keybind.KeyMatch(X, "Escape", mods, kc):
input.Reset()
default:
input.Add(mods, kc)
}
}).Connect(X, input.Id)
// Implement the WM_DELETE_WINDOW protocol.
parentWin.WMGracefulClose(func(w *xwindow.Window) {
xevent.Quit(X)
})
// Implement the WM_TAKE_FOCUS protocol. The callback function provided
// is executed when a valid WM_TAKE_FOCUS ClientMessage event has been
// received from the window manager.
// According to ICCCM Section 4.2.7, this is one of the three valid ways
// of setting input focus to a sub-window. (It's also easiest since it
// doesn't require us to monitor FocusChange events. EW.)
// If you have multiple sub-windows that can be focused, this callback
// function is where the logic would go to pick which sub-window should
// be focused upon receipt of a WM_TAKE_FOCUS message.
parentWin.WMTakeFocus(func(w *xwindow.Window, tstamp xproto.Timestamp) {
input.FocusParent(tstamp)
})
// Map the window and start the main X event loop.
input.Map()
parentWin.Map()
xevent.Main(X)
}