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split.go
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split.go
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package screen
import (
"context"
"github.com/cfoust/cy/pkg/geom"
"github.com/cfoust/cy/pkg/geom/tty"
"github.com/cfoust/cy/pkg/mux"
"github.com/cfoust/cy/pkg/taro"
"github.com/sasha-s/go-deadlock"
)
// Split renders two screens side by side (or one above the other) at a fixed proportion of its full width or height (respectively.)
type Split struct {
deadlock.RWMutex
*mux.UpdatePublisher
screenA, screenB Screen
// The size of the Split's screen.
size Size
// Whether the split should be vertical or horizontal.
isVertical bool
// Whether screenA is focused, which means its cursor position will be
// used and causes events to be sent to it.
isFocusA bool
// The proportion of the axis perpendicular to the split that A should occupy.
percent float64 // [0..1]
// The number of cells perpendicular to the split axis to include from
// screen A. This is calculated using `percent`.
splitCells int
}
var _ Screen = (*Split)(nil)
func (s *Split) getPositionB() Size {
positionB := geom.Size{C: s.splitCells}
if s.isVertical {
positionB = geom.Size{R: s.splitCells}
}
return positionB
}
func (s *Split) State() *tty.State {
s.RLock()
var (
size = s.size
positionB = s.getPositionB()
)
s.RUnlock()
state := tty.New(size)
stateA := s.screenA.State()
tty.Copy(geom.Size{}, state, stateA)
stateB := s.screenB.State()
tty.Copy(positionB, state, stateB)
return state
}
func (s *Split) Send(msg mux.Msg) {
if s.isFocusA {
s.screenA.Send(msg)
return
}
s.RLock()
positionB := s.getPositionB()
s.RUnlock()
s.screenB.Send(taro.TranslateMouseMessage(
msg,
-positionB.C,
-positionB.R,
))
}
func (s *Split) poll(ctx context.Context) {
updatesA := s.screenA.Subscribe(ctx)
updatesB := s.screenB.Subscribe(ctx)
for {
select {
case <-ctx.Done():
return
case event := <-updatesA.Recv():
s.Publish(event)
case event := <-updatesB.Recv():
s.Publish(event)
}
}
}
func (s *Split) recalculate(size Size) error {
s.size = size
axisCells := size.C
if s.isVertical {
axisCells = size.R
}
s.splitCells = geom.Max(int(s.percent*float64(axisCells)), 1)
positionB := s.getPositionB()
sizeA := geom.Size{
R: size.R,
C: s.splitCells,
}
if s.isVertical {
sizeA = geom.Size{
R: s.splitCells,
C: size.C,
}
}
err := s.screenA.Resize(sizeA)
if err != nil {
return err
}
sizeB := size.Sub(positionB)
err = s.screenB.Resize(sizeB)
if err != nil {
return err
}
return nil
}
func (s *Split) SetPercent(percent float64) error {
s.Lock()
defer s.Unlock()
s.percent = percent
return s.recalculate(s.size)
}
func (s *Split) Resize(size Size) error {
s.Lock()
defer s.Unlock()
return s.recalculate(size)
}
func NewSplit(
ctx context.Context,
screenA, screenB Screen,
percent float64,
isVertical bool,
) *Split {
split := &Split{
UpdatePublisher: mux.NewPublisher(),
screenA: screenA,
screenB: screenB,
isVertical: isVertical,
percent: percent,
}
go split.poll(ctx)
return split
}