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package widget
import "image"
// Focus keeps track of the currently selected widget.
// A widget receives true when it gains focus and false when it loses focus.
type Focus struct {
Widgets [][]chan bool
p image.Point // coordinates of currently focused widget
}
func NewFocus(rows []int) Focus {
f := Focus{
make([][]chan bool, len(rows)),
image.Point{},
}
for i := range f.Widgets {
f.Widgets[i] = make([]chan bool, rows[i])
for j := range f.Widgets[i] {
f.Widgets[i][j] = make(chan bool)
}
}
return f
}
func (f *Focus) Close() {
for i := range f.Widgets {
for j := range f.Widgets[i] {
close(f.Widgets[i][j])
}
}
}
func (f *Focus) Focus(focus bool) {
f.Widgets[f.p.Y][f.p.X] <- focus
}
func (f *Focus) Left() {
f.Focus(false)
if f.p.X <= 0 {
f.p.X = len(f.Widgets[f.p.Y]) - 1
} else {
f.p.X--
}
f.Focus(true)
}
func (f *Focus) Right() {
f.Focus(false)
f.p.X = (f.p.X + 1) % len(f.Widgets[f.p.Y])
f.Focus(true)
}
func (f *Focus) Up() {
f.Focus(false)
if f.p.Y <= 0 {
f.p.Y = len(f.Widgets) - 1
} else {
f.p.Y--
}
f.p.X = min(f.p.X, len(f.Widgets[f.p.Y])-1)
f.Focus(true)
}
func (f *Focus) Down() {
f.Focus(false)
f.p.Y = (f.p.Y + 1) % len(f.Widgets)
f.p.X = min(f.p.X, len(f.Widgets[f.p.Y])-1)
f.Focus(true)
}
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