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Expose resize events via *Gui.SetResizeFunc #124

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Expose resize events via *Gui.SetResizeFunc #124

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16 changes: 14 additions & 2 deletions _examples/size.go
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@ func main() {
defer g.Close()

g.SetManagerFunc(layout)
g.SetResizeFunc(onresize)

if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
log.Panicln(err)
Expand All @@ -31,12 +32,23 @@ func main() {

func layout(g *gocui.Gui) error {
maxX, maxY := g.Size()
v, err := g.SetView("size", maxX/2-7, maxY/2, maxX/2+7, maxY/2+2)
_, err := g.SetView("size", maxX/2-7, maxY/2, maxX/2+7, maxY/2+2)
if err != nil && err != gocui.ErrUnknownView {
return err
}
return nil
}

func onresize(g *gocui.Gui, x, y int) error {
v, err := g.View("size")
if err != nil {
if err != gocui.ErrUnknownView {
return err
}
return nil
}
v.Clear()
fmt.Fprintf(v, "%d, %d", maxX, maxY)
fmt.Fprintf(v, "%d, %d", x, y)
return nil
}

Expand Down
33 changes: 25 additions & 8 deletions gui.go
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Original file line number Diff line number Diff line change
Expand Up @@ -32,14 +32,15 @@ const (
// Gui represents the whole User Interface, including the views, layouts
// and keybindings.
type Gui struct {
tbEvents chan termbox.Event
userEvents chan userEvent
views []*View
currentView *View
managers []Manager
keybindings []*keybinding
maxX, maxY int
outputMode OutputMode
tbEvents chan termbox.Event
userEvents chan userEvent
views []*View
currentView *View
managers []Manager
resizeHandler func(g *Gui, x, y int) error
keybindings []*keybinding
maxX, maxY int
outputMode OutputMode

// BgColor and FgColor allow to configure the background and foreground
// colors of the GUI.
Expand Down Expand Up @@ -346,6 +347,11 @@ func (g *Gui) SetManagerFunc(manager func(*Gui) error) {
g.SetManager(ManagerFunc(manager))
}

// SetResizeFunc sets a handler that will be called on resize events.
func (g *Gui) SetResizeFunc(handler func(g *Gui, x, y int) error) {
g.resizeHandler = handler
}

// MainLoop runs the main loop until an error is returned. A successful
// finish should return ErrQuit.
func (g *Gui) MainLoop() error {
Expand Down Expand Up @@ -411,6 +417,8 @@ func (g *Gui) handleEvent(ev *termbox.Event) error {
switch ev.Type {
case termbox.EventKey, termbox.EventMouse:
return g.onKey(ev)
case termbox.EventResize:
return g.onResize(ev)
case termbox.EventError:
return ev.Err
default:
Expand Down Expand Up @@ -634,3 +642,12 @@ func (g *Gui) execKeybindings(v *View, ev *termbox.Event) (matched bool, err err
}
return matched, nil
}

// onResize manages resize events. It executes the resize handler if it's set.
func (g *Gui) onResize(ev *termbox.Event) error {
if g.resizeHandler != nil {
maxX, maxY := g.Size()
return g.resizeHandler(g, maxX, maxY)
}
return nil
}