app/internal/window: allow punctuation as keycode events

Allows things like "ctrl-{" and ".".

All punctuation is returned as-is, e.g. "!" is "!", not "shift-1", and
"{" is "{", not "shift-[".

Also add the Enter key as a known key (fn-return on my Mac).

Signed-off-by: Larry Clapp <larry@theclapp.org>

app/internal/window/os_macos.go

@@ -10,6 +10,7 @@ import (
 	"runtime"
 	"sync"
 	"time"
+	"unicode"
 	"unsafe"
 
 	"gioui.org/f32"
@@ -118,13 +119,14 @@ func gio_onFrameCallback(view C.CFTypeRef) {
 //export gio_onKeys
 func gio_onKeys(view C.CFTypeRef, cstr *C.char, ti C.double, mods C.NSUInteger) {
 	str := C.GoString(cstr)
+	kmods := convertMods(mods)
 	viewDo(view, func(views viewMap, view C.CFTypeRef) {
 		w := views[view]
 		for _, k := range str {
 			if n, ok := convertKey(k); ok {
 				w.w.Event(key.Event{
 					Name:      n,
-					Modifiers: convertMods(mods),
+					Modifiers: kmods,
 				})
 			}
 		}
@@ -292,12 +294,6 @@ func Main() {
 }
 
 func convertKey(k rune) (string, bool) {
-	if '0' <= k && k <= '9' || 'A' <= k && k <= 'Z' {
-		return string(k), true
-	}
-	if 'a' <= k && k <= 'z' {
-		return string(k - 0x20), true
-	}
 	var n string
 	switch k {
 	case 0x1b:
@@ -312,6 +308,8 @@ func convertKey(k rune) (string, bool) {
 		n = key.NameDownArrow
 	case 0xd:
 		n = key.NameReturn
+	case 0x3:
+		n = key.NameEnter
 	case C.NSHomeFunctionKey:
 		n = key.NameHome
 	case C.NSEndFunctionKey:
@@ -353,7 +351,11 @@ func convertKey(k rune) (string, bool) {
 	case 0x20:
 		n = "Space"
 	default:
-		return "", false
+		k = unicode.ToUpper(k)
+		if !unicode.IsPrint(k) {
+			return "", false
+		}
+		n = string(k)
 	}
 	return n, true
 }

io/key/key.go

@@ -39,12 +39,12 @@ type FocusEvent struct {
 // An Event is generated when a key is pressed. For text input
 // use EditEvent.
 type Event struct {
-	// Name of the key. For letters, the upper case form is used.
-	// Use the Name* constants for special keys suchs as the arrow
-	// keys.
+	// Name of the key. For letters, the upper case form is used, via
+	// unicode.ToUpper. The shift modifier is taken into account, all other
+	// modifiers are ignored. For example, the "shift-1" and "ctrl-shift-1"
+	// combinations both give the Name "!" with the US keyboard layout.
 	Name string
-	// Modifiers is the set of active modifiers when
-	// the key was pressed.
+	// Modifiers is the set of active modifiers when the key was pressed.
 	Modifiers Modifiers
 }