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