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tomo-old/backends/x/system.go

134 lines
3.0 KiB
Go

package x
import "image"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/canvas"
type entitySet map[*entity] struct { }
func (set entitySet) Empty () bool {
return len(set) == 0
}
func (set entitySet) Has (entity *entity) bool {
_, ok := set[entity]
return ok
}
func (set entitySet) Add (entity *entity) {
set[entity] = struct { } { }
}
type system struct {
child *entity
focused *entity
canvas canvas.BasicCanvas
theme tomo.Theme
config tomo.Config
invalidateIgnore bool
drawingInvalid entitySet
anyLayoutInvalid bool
drags [10]tomo.MouseTarget
pushFunc func (image.Rectangle)
}
func (system *system) initialize () {
system.drawingInvalid = make(entitySet)
}
func (system *system) SetTheme (theme tomo.Theme) {
system.theme = theme
system.propagate (func (entity *entity) bool {
if child, ok := system.child.element.(tomo.Themeable); ok {
child.SetTheme(theme)
}
return true
})
}
func (system *system) SetConfig (config tomo.Config) {
system.config = config
system.propagate (func (entity *entity) bool {
if child, ok := system.child.element.(tomo.Configurable); ok {
child.SetConfig(config)
}
return true
})
}
func (system *system) focusNext () {
// TODO
}
func (system *system) focusPrevious () {
// TODO
}
func (system *system) propagate (callback func (*entity) bool) {
if system.child == nil { return }
system.child.propagate(callback)
}
func (system *system) childAt (point image.Point) *entity {
if system.child == nil { return nil }
return system.child.childAt(point)
}
func (system *system) resizeChildToFit () {
system.child.bounds = system.canvas.Bounds()
system.child.clippedBounds = system.child.bounds
system.child.Invalidate()
if system.child.isContainer {
system.child.InvalidateLayout()
}
}
func (system *system) afterEvent () {
if system.anyLayoutInvalid {
system.layout(system.child, false)
system.anyLayoutInvalid = false
}
system.draw()
}
func (system *system) layout (entity *entity, force bool) {
if entity == nil { return }
if entity.layoutInvalid == true || force {
entity.element.(tomo.Container).Layout()
entity.layoutInvalid = false
force = true
}
for _, child := range entity.children {
system.layout(child, force)
}
}
func (system *system) draw () {
finalBounds := image.Rectangle { }
// ignore invalidations that result from drawing elements, because if an
// element decides to do that it really needs to rethink its life
// choices.
system.invalidateIgnore = true
defer func () { system.invalidateIgnore = false } ()
for entity := range system.drawingInvalid {
entity.element.Draw (canvas.Cut (
system.canvas,
entity.clippedBounds))
finalBounds = finalBounds.Union(entity.clippedBounds)
}
system.drawingInvalid = make(entitySet)
// TODO: don't just union all the bounds together, we can definetly
// consolidateupdated regions more efficiently than this.
if !finalBounds.Empty() {
system.pushFunc(finalBounds)
}
}