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rui/keyEvents.go

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package rui
import "strings"
const (
// KeyDown is the constant for "key-down-event" property tag.
// The "key-down-event" event is fired when a key is pressed.
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// The main listener format:
// func(View, KeyEvent).
// The additional listener formats:
// func(KeyEvent), func(View), and func().
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KeyDownEvent = "key-down-event"
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// KeyPp is the constant for "key-up-event" property tag.
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// The "key-up-event" event is fired when a key is released.
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// The main listener format:
// func(View, KeyEvent).
// The additional listener formats:
// func(KeyEvent), func(View), and func().
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KeyUpEvent = "key-up-event"
)
type KeyEvent struct {
// TimeStamp is the time at which the event was created (in milliseconds).
// This value is time since epoch—but in reality, browsers' definitions vary.
TimeStamp uint64
// Key is the key value of the key represented by the event. If the value has a printed representation,
// this attribute's value is the same as the char property. Otherwise, it's one of the key value strings
// specified in Key values. If the key can't be identified, its value is the string "Unidentified".
Key string
// Code holds a string that identifies the physical key being pressed. The value is not affected
// by the current keyboard layout or modifier state, so a particular key will always return the same value.
Code string
// Repeat == true if a key has been depressed long enough to trigger key repetition, otherwise false.
Repeat bool
// CtrlKey == true if the control key was down when the event was fired. false otherwise.
CtrlKey bool
// ShiftKey == true if the shift key was down when the event was fired. false otherwise.
ShiftKey bool
// AltKey == true if the alt key was down when the event was fired. false otherwise.
AltKey bool
// MetaKey == true if the meta key was down when the event was fired. false otherwise.
MetaKey bool
}
func valueToKeyListeners(value interface{}) ([]func(View, KeyEvent), bool) {
if value == nil {
return nil, true
}
switch value := value.(type) {
case func(View, KeyEvent):
return []func(View, KeyEvent){value}, true
case func(KeyEvent):
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fn := func(_ View, event KeyEvent) {
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value(event)
}
return []func(View, KeyEvent){fn}, true
case func(View):
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fn := func(view View, _ KeyEvent) {
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value(view)
}
return []func(View, KeyEvent){fn}, true
case func():
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fn := func(View, KeyEvent) {
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value()
}
return []func(View, KeyEvent){fn}, true
case []func(View, KeyEvent):
if len(value) == 0 {
return nil, true
}
for _, fn := range value {
if fn == nil {
return nil, false
}
}
return value, true
case []func(KeyEvent):
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, KeyEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
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listeners[i] = func(_ View, event KeyEvent) {
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v(event)
}
}
return listeners, true
case []func(View):
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, KeyEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
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listeners[i] = func(view View, _ KeyEvent) {
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v(view)
}
}
return listeners, true
case []func():
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, KeyEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
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listeners[i] = func(View, KeyEvent) {
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v()
}
}
return listeners, true
case []interface{}:
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, KeyEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
switch v := v.(type) {
case func(View, KeyEvent):
listeners[i] = v
case func(KeyEvent):
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listeners[i] = func(_ View, event KeyEvent) {
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v(event)
}
case func(View):
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listeners[i] = func(view View, _ KeyEvent) {
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v(view)
}
case func():
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listeners[i] = func(View, KeyEvent) {
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v()
}
default:
return nil, false
}
}
return listeners, true
}
return nil, false
}
var keyEvents = map[string]struct{ jsEvent, jsFunc string }{
KeyDownEvent: {jsEvent: "onkeydown", jsFunc: "keyDownEvent"},
KeyUpEvent: {jsEvent: "onkeyup", jsFunc: "keyUpEvent"},
}
func (view *viewData) setKeyListener(tag string, value interface{}) bool {
listeners, ok := valueToKeyListeners(value)
if !ok {
notCompatibleType(tag, value)
return false
}
if listeners == nil {
view.removeKeyListener(tag)
} else if js, ok := keyEvents[tag]; ok {
view.properties[tag] = listeners
if view.created {
updateProperty(view.htmlID(), js.jsEvent, js.jsFunc+"(this, event)", view.Session())
}
} else {
return false
}
return true
}
func (view *viewData) removeKeyListener(tag string) {
delete(view.properties, tag)
if view.created {
if js, ok := keyEvents[tag]; ok {
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removeProperty(view.htmlID(), js.jsEvent, view.Session())
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}
}
}
func getKeyListeners(view View, subviewID string, tag string) []func(View, KeyEvent) {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
if value := view.Get(tag); value != nil {
if result, ok := value.([]func(View, KeyEvent)); ok {
return result
}
}
}
return []func(View, KeyEvent){}
}
func keyEventsHtml(view View, buffer *strings.Builder) {
for tag, js := range keyEvents {
if listeners := getKeyListeners(view, "", tag); len(listeners) > 0 {
buffer.WriteString(js.jsEvent + `="` + js.jsFunc + `(this, event)" `)
}
}
}
func handleKeyEvents(view View, tag string, data DataObject) {
listeners := getKeyListeners(view, "", tag)
if len(listeners) == 0 {
return
}
getBool := func(tag string) bool {
if value, ok := data.PropertyValue(tag); ok && value == "1" {
return true
}
return false
}
key, _ := data.PropertyValue("key")
code, _ := data.PropertyValue("code")
event := KeyEvent{
TimeStamp: getTimeStamp(data),
Key: key,
Code: code,
Repeat: getBool("repeat"),
CtrlKey: getBool("ctrlKey"),
ShiftKey: getBool("shiftKey"),
AltKey: getBool("altKey"),
MetaKey: getBool("metaKey"),
}
for _, listener := range listeners {
listener(view, event)
}
}
// GetKeyDownListeners returns the "key-down-event" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetKeyDownListeners(view View, subviewID string) []func(View, KeyEvent) {
return getKeyListeners(view, subviewID, KeyDownEvent)
}
// GetKeyUpListeners returns the "key-up-event" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetKeyUpListeners(view View, subviewID string) []func(View, KeyEvent) {
return getKeyListeners(view, subviewID, KeyUpEvent)
}