Added Alt+[key] and F10 handling to Windows Area key events. Also more TODOs.

area_windows.go

@@ -465,6 +465,15 @@ func areaWndProc(s *sysData) func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lPara
 			_MA_ACTIVATE = 1
 		)
 
+		defwndproc := func() _LRESULT {
+			r1, _, _ := defWindowProc.Call(
+				uintptr(hwnd),
+				uintptr(uMsg),
+				uintptr(wParam),
+				uintptr(lParam))
+			return _LRESULT(r1)
+		}
+
 		switch uMsg {
 		case _WM_PAINT:
 			paintArea(s)
@@ -479,22 +488,25 @@ func areaWndProc(s *sysData) func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lPara
 			// TODO make this unnecessary
 			if s != nil && s.hwnd != 0 {			// this message can be sent before s is assigned properly
 				scrollArea(s, wParam, _SB_VERT)
-			}
 				return 0
+			}
+			return defwndproc()
 		case _WM_SIZE:
 			// TODO make this unnecessary
 			if s != nil && s.hwnd != 0 {			// this message can be sent before s is assigned properly
 				adjustAreaScrollbars(s)
-			}
 				return 0
+			}
+			return defwndproc()
 		case _WM_MOUSEACTIVATE:
 			// register our window for keyboard input
 			// (see http://www.catch22.net/tuts/custom-controls)
 			r1, _, err := _setFocus.Call(uintptr(s.hwnd))
 			if r1 == 0 {		// failure
 				panic(fmt.Errorf("error giving Area keyboard focus: %v", err))
-			}
 				return _MA_ACTIVATE		// TODO eat the click?
+			}
+			return defwndproc()
 		case _WM_MOUSEMOVE:
 			areaMouseEvent(s, 0, false, 0, wParam, lParam)
 			return 0
@@ -532,6 +544,19 @@ func areaWndProc(s *sysData) func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lPara
 		case _WM_KEYUP:
 			areaKeyEvent(s, true, wParam, lParam)
 			return 0
+		// Alt+[anything] and F10 send these instead
+		case _WM_SYSKEYDOWN:
+			handled := areaKeyEvent(s, false, wParam, lParam)
+			if handled {
+				return 0
+			}
+			return defwndproc()
+		case _WM_SYSKEYUP:
+			handled := areaKeyEvent(s, true, wParam, lParam)
+			if handled {
+				return 0
+			}
+			return defwndproc()
 		case msgSetAreaSize:
 			s.areawidth = int(wParam)		// see setAreaSize() in sysdata_windows.go
 			s.areaheight = int(lParam)
@@ -539,12 +564,7 @@ func areaWndProc(s *sysData) func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lPara
 			repaintArea(s)					// this calls for an update
 			return 0
 		default:
-			r1, _, _ := defWindowProc.Call(
+			return defwndproc()
-				uintptr(hwnd),
-				uintptr(uMsg),
-				uintptr(wParam),
-				uintptr(lParam))
-			return _LRESULT(r1)
 		}
 		panic(fmt.Sprintf("areaWndProc message %d did not return: internal bug in ui library", uMsg))
 	}

todo.md

@@ -87,6 +87,7 @@ super ultra important things:
 	- references: https://github.com/glfw/glfw/blob/master/src/win32_window.c#L182, http://www.catch22.net/tuts/custom-controls
 - Area redraw on Windows is still a bit flaky, especially after changing the Area size to something larger than the window size and then resizing the window(???)
 - despite us explicitly clearing the clip area on Windows, Area still doesn't seem to draw alpha bits correctly... it appears as if we are drawing over the existing image each time
+- on Windows, Shift+(num pad key) triggers the shifted key code when num lock is off; will need to reorder key code tests on all platforms to fix this
 
 important things:
 - make specific wording in documentation consistent (make/create, etc.)