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rui/focusEvents.go

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package rui
import "strings"
const (
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// FocusEvent is the constant for "focus-event" property tag.
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// The "focus-event" event occurs when the View takes input focus.
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// The main listener format:
// func(View).
// The additional listener format:
// func().
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FocusEvent = "focus-event"
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// LostFocusEvent is the constant for "lost-focus-event" property tag.
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// The "lost-focus-event" event occurs when the View lost input focus.
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// The main listener format:
// func(View).
// The additional listener format:
// func().
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LostFocusEvent = "lost-focus-event"
)
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func valueToNoParamListeners[V any](value any) ([]func(V), bool) {
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if value == nil {
return nil, true
}
switch value := value.(type) {
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case func(V):
return []func(V){value}, true
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case func():
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fn := func(V) {
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value()
}
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return []func(V){fn}, true
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case []func(V):
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if len(value) == 0 {
return nil, true
}
for _, fn := range value {
if fn == nil {
return nil, false
}
}
return value, true
case []func():
count := len(value)
if count == 0 {
return nil, true
}
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listeners := make([]func(V), count)
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for i, v := range value {
if v == nil {
return nil, false
}
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listeners[i] = func(V) {
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v()
}
}
return listeners, true
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case []any:
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count := len(value)
if count == 0 {
return nil, true
}
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listeners := make([]func(V), count)
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for i, v := range value {
if v == nil {
return nil, false
}
switch v := v.(type) {
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case func(V):
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listeners[i] = v
case func():
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listeners[i] = func(V) {
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v()
}
default:
return nil, false
}
}
return listeners, true
}
return nil, false
}
var focusEvents = map[string]struct{ jsEvent, jsFunc string }{
FocusEvent: {jsEvent: "onfocus", jsFunc: "focusEvent"},
LostFocusEvent: {jsEvent: "onblur", jsFunc: "blurEvent"},
}
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func (view *viewData) setFocusListener(tag string, value any) bool {
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listeners, ok := valueToNoParamListeners[View](value)
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if !ok {
notCompatibleType(tag, value)
return false
}
if listeners == nil {
view.removeFocusListener(tag)
} else if js, ok := focusEvents[tag]; ok {
view.properties[tag] = listeners
if view.created {
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view.session.updateProperty(view.htmlID(), js.jsEvent, js.jsFunc+"(this, event)")
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}
} else {
return false
}
return true
}
func (view *viewData) removeFocusListener(tag string) {
delete(view.properties, tag)
if view.created {
if js, ok := focusEvents[tag]; ok {
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view.session.removeProperty(view.htmlID(), js.jsEvent)
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}
}
}
func getFocusListeners(view View, subviewID []string, tag string) []func(View) {
if len(subviewID) > 0 && subviewID[0] != "" {
view = ViewByID(view, subviewID[0])
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}
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if view != nil {
if value := view.Get(tag); value != nil {
if result, ok := value.([]func(View)); ok {
return result
}
}
}
return []func(View){}
}
func focusEventsHtml(view View, buffer *strings.Builder) {
if view.Focusable() {
for _, js := range focusEvents {
buffer.WriteString(js.jsEvent + `="` + js.jsFunc + `(this, event)" `)
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}
}
}
// GetFocusListeners returns a FocusListener list. If there are no listeners then the empty list is returned
// If the second argument (subviewID) is not specified or it is "" then a value from the first argument (view) is returned.
func GetFocusListeners(view View, subviewID ...string) []func(View) {
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return getFocusListeners(view, subviewID, FocusEvent)
}
// GetLostFocusListeners returns a LostFocusListener list. If there are no listeners then the empty list is returned
// If the second argument (subviewID) is not specified or it is "" then a value from the first argument (view) is returned.
func GetLostFocusListeners(view View, subviewID ...string) []func(View) {
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return getFocusListeners(view, subviewID, LostFocusEvent)
}