fixes #669 Focus event support for Windows console

console_win.go

@@ -51,6 +51,7 @@ type cScreen struct {
 	oimode      uint32
 	oomode      uint32
 	cells       CellBuffer
+	focusEnable bool
 
 	mouseEnabled bool
 	wg           sync.WaitGroup
@@ -280,9 +281,17 @@ func (s *cScreen) EnablePaste() {}
 
 func (s *cScreen) DisablePaste() {}
 
-func (s *cScreen) EnableFocus() {}
+func (s *cScreen) EnableFocus() {
+	s.Lock()
+	s.focusEnable = true
+	s.Unlock()
+}
 
-func (s *cScreen) DisableFocus() {}
+func (s *cScreen) DisableFocus() {
+	s.Lock()
+	s.focusEnable = false
+	s.Unlock()
+}
 
 func (s *cScreen) Fini() {
 	s.finiOnce.Do(func() {
@@ -448,8 +457,8 @@ const (
 	keyEvent    uint16 = 1
 	mouseEvent  uint16 = 2
 	resizeEvent uint16 = 4
-	// menuEvent   uint16 = 8  // don't use
-	// focusEvent  uint16 = 16 // don't use
+	menuEvent   uint16 = 8 // don't use
+	focusEvent  uint16 = 16
 )
 
 type mouseRecord struct {
@@ -460,6 +469,10 @@ type mouseRecord struct {
 	flags uint32
 }
 
+type focusRecord struct {
+	focused int32 // actually BOOL
+}
+
 const (
 	mouseHWheeled uint32 = 0x8
 	mouseVWheeled uint32 = 0x4
@@ -754,6 +767,16 @@ func (s *cScreen) getConsoleInput() error {
 			rrec.y = geti16(rec.data[2:])
 			s.postEvent(NewEventResize(int(rrec.x), int(rrec.y)))
 
+		case focusEvent:
+			var focus focusRecord
+			focus.focused = geti32(rec.data[0:])
+			s.Lock()
+			enabled := s.focusEnable
+			s.Unlock()
+			if enabled {
+				s.postEvent(NewEventFocus(focus.focused != 0))
+			}
+
 		default:
 		}
 	default: