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