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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.

package walk

type TreeViewItemEventHandler func(item *TreeViewItem)

type TreeViewItemEvent struct {
handlers []TreeViewItemEventHandler
}

func (e *TreeViewItemEvent) Attach(handler TreeViewItemEventHandler) int {
for i, h := range e.handlers {
if h == nil {
e.handlers[i] = handler
return i
}
}

e.handlers = append(e.handlers, handler)
return len(e.handlers) - 1
}

func (e *TreeViewItemEvent) Detach(handle int) {
e.handlers[handle] = nil
}

type TreeViewItemEventPublisher struct {
event TreeViewItemEvent
}

func (p *TreeViewItemEventPublisher) Event() *TreeViewItemEvent {
return &p.event
}

func (p *TreeViewItemEventPublisher) Publish(item *TreeViewItem) {
for _, handler := range p.event.handlers {
if handler != nil {
handler(item)
}
}
}
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