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cancel redraw requests as an attempt to improve performance

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This commit is contained in:
Andreas Rumpf 2017-06-28 09:46:26 +02:00
commit ba88fb9a0b
1 changed files with 6 additions and 3 deletions
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9
src/karax.nim
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@ -23,6 +23,7 @@ type
postRenderCallback: proc () postRenderCallback: proc ()
toFocus: Node toFocus: Node
toFocusV: VNode toFocusV: VNode
renderId: int
var var
kxi*: KaraxInstance ## The current Karax instance. This is always used kxi*: KaraxInstance ## The current Karax instance. This is always used
@ -354,7 +355,8 @@ proc dodraw(kxi: KaraxInstance) =
if kxi.toFocus != nil: if kxi.toFocus != nil:
kxi.toFocus.focus() kxi.toFocus.focus()
proc reqFrame(callback: proc()) {.importc: "window.requestAnimationFrame".} proc reqFrame(callback: proc()): int {.importc: "window.requestAnimationFrame".}
proc cancelFrame(id: int) {.importc: "window.cancelAnimationFrame".}
proc redraw*(kxi: KaraxInstance = kxi) = proc redraw*(kxi: KaraxInstance = kxi) =
# we buffer redraw requests: # we buffer redraw requests:
@ -363,14 +365,15 @@ proc redraw*(kxi: KaraxInstance = kxi) =
clearTimeout(drawTimeout) clearTimeout(drawTimeout)
drawTimeout = setTimeout(dodraw, 30) drawTimeout = setTimeout(dodraw, 30)
elif true: elif true:
reqFrame(proc () = kxi.dodraw) cancelFrame kxi.renderId
kxi.renderId = reqFrame(proc () = kxi.dodraw)
else: else:
dodraw(kxi) dodraw(kxi)
proc redrawSync*(kxi: KaraxInstance = kxi) = dodraw(kxi) proc redrawSync*(kxi: KaraxInstance = kxi) = dodraw(kxi)
proc init(ev: Event) = proc init(ev: Event) =
reqFrame(proc () = kxi.dodraw) kxi.renderId = reqFrame(proc () = kxi.dodraw)
proc setRenderer*(renderer: proc (): VNode, root: cstring = "ROOT", proc setRenderer*(renderer: proc (): VNode, root: cstring = "ROOT",
clientPostRenderCallback: proc () = nil): KaraxInstance {.discardable.} = clientPostRenderCallback: proc () = nil): KaraxInstance {.discardable.} =