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x/system.go
2023-07-05 03:25:50 -04:00

124 lines
2.3 KiB
Go

package x
import "image"
import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/canvas"
type boxSet map[anyBox] struct { }
func (set boxSet) Empty () bool {
return set == nil || len(set) == 0
}
func (set boxSet) Has (box anyBox) bool {
if set == nil { return false }
_, ok := set[box]
return ok
}
func (set *boxSet) Add (box anyBox) {
if *set == nil {
*set = make(boxSet)
}
(*set)[box] = struct { } { }
}
func (set *boxSet) Pop () anyBox {
for box := range *set {
delete(*set, box)
return box
}
return nil
}
type parent interface {
window () *window
canvas () canvas.Canvas
}
type anyBox interface {
tomo.Box
doDraw ()
doLayout ()
setParent (parent)
recursiveRedo ()
}
func assertAnyBox (unknown tomo.Box) anyBox {
if box, ok := unknown.(anyBox); ok {
return box
} else {
panic("foregin box implementation, i did not make this!")
}
}
func (window *window) SetRoot (root tomo.Object) {
if window.root != nil {
window.root.setParent(nil)
}
if root == nil {
window.root = nil
} else {
box := assertAnyBox(root.Box())
box.setParent(window)
window.invalidateLayout(box)
window.root = box
}
}
func (window *window) window () *window {
return window
}
func (window *window) canvas () canvas.Canvas {
return window.xCanvas
}
func (window *window) invalidateDraw (box anyBox) {
window.needDraw.Add(box)
}
func (window *window) invalidateLayout (box anyBox) {
window.needLayout.Add(box)
window.invalidateDraw(box)
}
func (window *window) focus (box anyBox) {
if window.focused == box { return }
window.invalidateDraw(window.focused)
window.focused = box
window.invalidateDraw(box)
}
func (window *window) afterEvent () {
if window.xCanvas == nil { return }
if window.needRedo {
// set child bounds
childBounds := window.metrics.bounds
childBounds = childBounds.Sub(childBounds.Min)
window.root.SetBounds(childBounds)
// full relayout/redraw
if window.root != nil {
window.root.recursiveRedo()
}
window.pushAll()
window.needRedo = false
return
}
for len(window.needLayout) > 0 {
window.needLayout.Pop().doLayout()
}
var toPush image.Rectangle
for len(window.needDraw) > 0 {
box := window.needDraw.Pop()
box.doDraw()
toPush = toPush.Union(box.Bounds())
}
if !toPush.Empty() {
window.pushRegion(toPush)
}
}