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// Copyright 2011 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package walk
type intEventHandlerInfo struct {
handler IntEventHandler
once bool
}
type IntEventHandler func(n int)
type IntEvent struct {
handlers []intEventHandlerInfo
}
func (e *IntEvent) Attach(handler IntEventHandler) int {
handlerInfo := intEventHandlerInfo{handler, false}
for i, h := range e.handlers {
if h.handler == nil {
e.handlers[i] = handlerInfo
return i
}
}
e.handlers = append(e.handlers, handlerInfo)
return len(e.handlers) - 1
}
func (e *IntEvent) Detach(handle int) {
e.handlers[handle].handler = nil
}
func (e *IntEvent) Once(handler IntEventHandler) {
i := e.Attach(handler)
e.handlers[i].once = true
}
type IntEventPublisher struct {
event IntEvent
}
func (p *IntEventPublisher) Event() *IntEvent {
return &p.event
}
func (p *IntEventPublisher) Publish(n int) {
for i, h := range p.event.handlers {
if h.handler != nil {
h.handler(n)
if h.once {
p.event.Detach(i)
}
}
}
}
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