63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
|
// 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 closeEventHandlerInfo struct {
|
||
|
|
handler CloseEventHandler
|
||
|
|
once bool
|
||
|
|
}
|
||
|
|
|
||
|
|
type CloseEventHandler func(canceled *bool, reason CloseReason)
|
||
|
|
|
||
|
|
type CloseEvent struct {
|
||
|
|
handlers []closeEventHandlerInfo
|
||
|
|
}
|
||
|
|
|
||
|
|
func (e *CloseEvent) Attach(handler CloseEventHandler) int {
|
||
|
|
handlerInfo := closeEventHandlerInfo{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 *CloseEvent) Detach(handle int) {
|
||
|
|
e.handlers[handle].handler = nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (e *CloseEvent) Once(handler CloseEventHandler) {
|
||
|
|
i := e.Attach(handler)
|
||
|
|
e.handlers[i].once = true
|
||
|
|
}
|
||
|
|
|
||
|
|
type CloseEventPublisher struct {
|
||
|
|
event CloseEvent
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *CloseEventPublisher) Event() *CloseEvent {
|
||
|
|
return &p.event
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *CloseEventPublisher) Publish(canceled *bool, reason CloseReason) {
|
||
|
|
for i, h := range p.event.handlers {
|
||
|
|
if h.handler != nil {
|
||
|
|
h.handler(canceled, reason)
|
||
|
|
|
||
|
|
if h.once {
|
||
|
|
p.event.Detach(i)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|