Added the new Modifiers handling to the Windows backend.

area_windows.go

@@ -513,6 +513,10 @@ func areaKeyEvent(s *sysData, up bool, wparam _WPARAM, lparam _LPARAM) bool {
 		ke.ExtKey = NEnter
 	} else if extkey, ok := extkeys[wparam]; ok {
 		ke.ExtKey = extkey
+	} else if mod, ok := modonlykeys[wparam]; ok {
+		ke.Modifier = mod
+		// don't include the modifier in ke.Modifiers
+		ke.Modifiers &^= mod
 	} else if xke, ok := fromScancode(uintptr(scancode)); ok {
 		// one of these will be nonzero
 		ke.Key = xke.Key
@@ -580,6 +584,22 @@ func init() {
 	}
 }
 
+var modonlykeys = map[_WPARAM]Modifiers{
+	// TODO except for Super, are the separate left/right necessary?
+	_VK_CONTROL:	Ctrl,
+	_VK_LCONTROL:	Ctrl,
+	_VK_RCONTROL:	Ctrl,
+	_VK_MENU:		Alt,
+	_VK_LMENU:		Alt,
+	_VK_RMENU:		Alt,
+	_VK_SHIFT:		Shift,
+	_VK_LSHIFT:		Shift,
+	_VK_RSHIFT:		Shift,
+	// there's no combined Windows key virtual-key code as there is with the others
+	_VK_LWIN:		Super,
+	_VK_RWIN:		Super,
+}
+
 var (
 	_setFocus = user32.NewProc("SetFocus")
 )

zconstants_windows_386.go

@@ -105,14 +105,20 @@ const _VK_F8 = 119
 const _VK_F9 = 120
 const _VK_HOME = 36
 const _VK_INSERT = 45
+const _VK_LCONTROL = 162
 const _VK_LEFT = 37
+const _VK_LMENU = 164
+const _VK_LSHIFT = 160
 const _VK_LWIN = 91
 const _VK_MENU = 18
 const _VK_MULTIPLY = 106
 const _VK_NEXT = 34
 const _VK_PRIOR = 33
+const _VK_RCONTROL = 163
 const _VK_RETURN = 13
 const _VK_RIGHT = 39
+const _VK_RMENU = 165
+const _VK_RSHIFT = 161
 const _VK_RWIN = 92
 const _VK_SHIFT = 16
 const _VK_SUBTRACT = 109

zconstants_windows_amd64.go

@@ -105,14 +105,20 @@ const _VK_F8 = 119
 const _VK_F9 = 120
 const _VK_HOME = 36
 const _VK_INSERT = 45
+const _VK_LCONTROL = 162
 const _VK_LEFT = 37
+const _VK_LMENU = 164
+const _VK_LSHIFT = 160
 const _VK_LWIN = 91
 const _VK_MENU = 18
 const _VK_MULTIPLY = 106
 const _VK_NEXT = 34
 const _VK_PRIOR = 33
+const _VK_RCONTROL = 163
 const _VK_RETURN = 13
 const _VK_RIGHT = 39
+const _VK_RMENU = 165
+const _VK_RSHIFT = 161
 const _VK_RWIN = 92
 const _VK_SHIFT = 16
 const _VK_SUBTRACT = 109