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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 TreeViewItemSelectionEventHandler func(old, new *TreeViewItem)
type TreeViewItemSelectionEvent struct {
handlers []TreeViewItemSelectionEventHandler
}
func (e *TreeViewItemSelectionEvent) Attach(handler TreeViewItemSelectionEventHandler) 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 *TreeViewItemSelectionEvent) Detach(handle int) {
e.handlers[handle] = nil
}
type TreeViewItemSelectionEventPublisher struct {
event TreeViewItemSelectionEvent
}
func (p *TreeViewItemSelectionEventPublisher) Event() *TreeViewItemSelectionEvent {
return &p.event
}
func (p *TreeViewItemSelectionEventPublisher) Publish(old, new *TreeViewItem) {
for _, handler := range p.event.handlers {
if handler != nil {
handler(old, new)
}
}
}
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