izapple2/keyboard.go

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2020-10-10 15:35:25 +00:00
package izapple2
import "unicode"
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// KeyboardProvider provides a keyboard implementation
type KeyboardProvider interface {
GetKey(strobe bool) (key uint8, ok bool)
}
// KeyboardChannel is a possible implemetation of a Keyboard provider
type KeyboardChannel struct {
keyChannel chan uint8
a *Apple2
}
// NewKeyboardChannel returns an instance of KeyboardChannel
func NewKeyboardChannel(a *Apple2) *KeyboardChannel {
var k KeyboardChannel
k.keyChannel = make(chan uint8, 100)
k.a = a
a.SetKeyboardProvider(&k)
return &k
}
// PutText sends texts to the emulator as succesive chars
func (k *KeyboardChannel) PutText(text string) {
for _, ch := range text {
k.PutRune(ch)
}
}
// PutRune sends a rune to the emulator if it is valid printable ASCII
func (k *KeyboardChannel) PutRune(ch rune) {
// We will use computed text only for printable ASCII chars
if ch >= ' ' && ch <= '~' {
if k.a.IsForceCaps() && ch >= 'a' && ch <= 'z' {
ch = unicode.ToUpper(ch)
}
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k.PutChar(uint8(ch))
}
}
// PutChar sends a character to the emulator
func (k *KeyboardChannel) PutChar(ch uint8) {
k.keyChannel <- ch
}
// GetKey returns a pressed key if available
func (k *KeyboardChannel) GetKey(_ bool) (key uint8, ok bool) {
select {
case key = <-k.keyChannel:
ok = true
default:
ok = false
}
return
}