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package main
import (
"image"
"image/draw"
"github.com/faiface/gui"
)
type envPair struct {
events <-chan gui.Event
draw chan<- func(draw.Image) image.Rectangle
}
func (ep *envPair) Events() <-chan gui.Event { return ep.events }
func (ep *envPair) Draw() chan<- func(draw.Image) image.Rectangle { return ep.draw }
func FixedLeft(env gui.Env, maxX int) gui.Env {
out, in := gui.MakeEventsChan()
go func() {
for e := range env.Events() {
if resize, ok := e.(gui.Resize); ok {
resize.Max.X = maxX
in <- resize
} else {
in <- e
}
}
close(in)
}()
return &envPair{out, env.Draw()}
}
func FixedRight(env gui.Env, minX int) gui.Env {
out, in := gui.MakeEventsChan()
go func() {
for e := range env.Events() {
if resize, ok := e.(gui.Resize); ok {
resize.Min.X = minX
in <- resize
} else {
in <- e
}
}
close(in)
}()
return &envPair{out, env.Draw()}
}
func FixedTop(env gui.Env, maxY int) gui.Env {
out, in := gui.MakeEventsChan()
go func() {
for e := range env.Events() {
if resize, ok := e.(gui.Resize); ok {
resize.Max.Y = maxY
in <- resize
} else {
in <- e
}
}
close(in)
}()
return &envPair{out, env.Draw()}
}
func FixedBottom(env gui.Env, minY int) gui.Env {
out, in := gui.MakeEventsChan()
go func() {
for e := range env.Events() {
if resize, ok := e.(gui.Resize); ok {
resize.Min.Y = minY
in <- resize
} else {
in <- e
}
}
close(in)
}()
return &envPair{out, env.Draw()}
}
func EvenHorizontal(env gui.Env, minI, maxI, n int) gui.Env {
out, in := gui.MakeEventsChan()
go func() {
for e := range env.Events() {
if resize, ok := e.(gui.Resize); ok {
x0, x1 := resize.Min.X, resize.Max.X
resize.Min.X, resize.Max.X = x0+(x1-x0)*minI/n, x0+(x1-x0)*maxI/n
in <- resize
} else {
in <- e
}
}
close(in)
}()
return &envPair{out, env.Draw()}
}
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