79 lines
1.6 KiB
Go
79 lines
1.6 KiB
Go
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// 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 eventHandlerInfo struct {
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handler EventHandler
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once bool
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}
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type EventHandler func()
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type Event struct {
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handlers []eventHandlerInfo
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}
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func (e *Event) Attach(handler EventHandler) int {
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handlerInfo := eventHandlerInfo{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 *Event) Detach(handle int) {
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e.handlers[handle].handler = nil
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}
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func (e *Event) Once(handler EventHandler) {
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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 EventPublisher struct {
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event Event
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}
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func (p *EventPublisher) Event() *Event {
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return &p.event
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}
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func (p *EventPublisher) Publish() {
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// This is a kludge to find the form that the event publisher is
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// affiliated with. It's only necessary because the event publisher
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// doesn't keep a pointer to the form on its own, and the call
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// to Publish isn't providing it either.
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if form := App().ActiveForm(); form != nil {
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fb := form.AsFormBase()
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fb.inProgressEventCount++
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defer func() {
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fb.inProgressEventCount--
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if fb.inProgressEventCount == 0 && fb.layoutScheduled {
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fb.layoutScheduled = false
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fb.startLayout()
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}
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}()
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}
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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()
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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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