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support parameter-less event handlers

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Andreas Rumpf 2017-08-29 19:32:49 +02:00
commit 2c3e8be9b4
1 changed files with 12 additions and 0 deletions
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src/karax.nim
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@ -642,6 +642,18 @@ proc addEventHandler*(n: VNode; k: EventKind; action: EventHandler;
if not kxi.surpressRedraws: redraw(kxi) if not kxi.surpressRedraws: redraw(kxi)
addEventListener(n, k, wrapper) addEventListener(n, k, wrapper)
proc addEventHandler*(n: VNode; k: EventKind; action: proc();
kxi: KaraxInstance = kxi) =
## Implements the foundation of Karax's event management.
## Karax DSL transforms ``tag(onEvent = handler)`` to
## ``tempNode.addEventHandler(tagNode, EventKind.onEvent, wrapper)``
## where ``wrapper`` calls the passed ``action`` and then triggers
## a ``redraw``.
proc wrapper(ev: Event; n: VNode) =
action()
if not kxi.surpressRedraws: redraw(kxi)
addEventListener(n, k, wrapper)
proc setOnHashChange*(action: proc (hashPart: cstring)) = proc setOnHashChange*(action: proc (hashPart: cstring)) =
var onhashChange {.importc: "window.onhashchange".}: proc() var onhashChange {.importc: "window.onhashchange".}: proc()
var hashPart {.importc: "window.location.hash".}: cstring var hashPart {.importc: "window.location.hash".}: cstring