From 055cd36b20d9ab9d002e867bf31f0a64782c3789 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Thu, 29 May 2014 12:17:02 -0400
Subject: [PATCH] Added the new Modifiers handling to the Windows backend.

---
 area_windows.go             | 20 ++++++++++++++++++++
 zconstants_windows_386.go   |  6 ++++++
 zconstants_windows_amd64.go |  6 ++++++
 3 files changed, 32 insertions(+)

diff --git a/area_windows.go b/area_windows.go
index 5664ffa..6269002 100644
--- a/area_windows.go
+++ b/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")
 )
diff --git a/zconstants_windows_386.go b/zconstants_windows_386.go
index 4c63c62..4427631 100644
--- a/zconstants_windows_386.go
+++ b/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
diff --git a/zconstants_windows_amd64.go b/zconstants_windows_amd64.go
index f1b0060..0274d3a 100644
--- a/zconstants_windows_amd64.go
+++ b/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