63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
// Copyright 2017 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 intRangeEventHandlerInfo struct {
|
|
handler IntRangeEventHandler
|
|
once bool
|
|
}
|
|
|
|
type IntRangeEventHandler func(from, to int)
|
|
|
|
type IntRangeEvent struct {
|
|
handlers []intRangeEventHandlerInfo
|
|
}
|
|
|
|
func (e *IntRangeEvent) Attach(handler IntRangeEventHandler) int {
|
|
handlerInfo := intRangeEventHandlerInfo{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 *IntRangeEvent) Detach(handle int) {
|
|
e.handlers[handle].handler = nil
|
|
}
|
|
|
|
func (e *IntRangeEvent) Once(handler IntRangeEventHandler) {
|
|
i := e.Attach(handler)
|
|
e.handlers[i].once = true
|
|
}
|
|
|
|
type IntRangeEventPublisher struct {
|
|
event IntRangeEvent
|
|
}
|
|
|
|
func (p *IntRangeEventPublisher) Event() *IntRangeEvent {
|
|
return &p.event
|
|
}
|
|
|
|
func (p *IntRangeEventPublisher) Publish(from, to int) {
|
|
for i, h := range p.event.handlers {
|
|
if h.handler != nil {
|
|
h.handler(from, to)
|
|
|
|
if h.once {
|
|
p.event.Detach(i)
|
|
}
|
|
}
|
|
}
|
|
}
|