Fixed Area mouse events being sent when something happens outside the Area itself.

area_darwin.go

@@ -143,6 +143,7 @@ func areaMouseEvent(self C.id, e C.id, click bool, up bool) {
 	s := getSysData(self)
 	xp := C.getTranslatedEventPoint(self, e)
 	me.Pos = image.Pt(int(xp.x), int(xp.y))
+	// no need to check me.Pos; Cocoa won't send an event outside the Area
 	me.Modifiers = parseModifiers(e)
 	which := uint(C.objc_msgSend_intret_noargs(e, _buttonNumber)) + 1
 	if which == 3 {		// swap middle and right button numbers

area_unix.go

@@ -105,6 +105,8 @@ func makeModifiers(state C.guint, m Modifiers) Modifiers {
 
 // shared code for finishing up and sending a mouse event
 func finishMouseEvent(widget *C.GtkWidget, data C.gpointer, me MouseEvent, mb uint, x C.gdouble, y C.gdouble, state C.guint, gdkwindow *C.GdkWindow) {
+	var areawidth, areaheight C.gint
+
 	s := (*sysData)(unsafe.Pointer(data))
 	state = translateModifiers(state, gdkwindow)
 	me.Modifiers = makeModifiers(state, 0)
@@ -126,6 +128,10 @@ func finishMouseEvent(widget *C.GtkWidget, data C.gpointer, me MouseEvent, mb ui
 		me.Held = append(me.Held, 5)
 	}
 	me.Pos = image.Pt(int(x), int(y))
+	C.gtk_widget_get_size_request(widget, &areawidth, &areaheight)
+	if !me.Pos.In(image.Rect(0, 0, int(areawidth), int(areaheight))) {		// outside the actual Area; no event
+		return
+	}
 	repaint := s.handler.Mouse(me)
 	if repaint {
 		C.gtk_widget_queue_draw(widget)

area_windows.go

@@ -358,6 +358,9 @@ func areaMouseEvent(s *sysData, button uint, up bool, count uint, wparam _WPARAM
 	xpos += lparam._X()
 	ypos += lparam._Y()
 	me.Pos = image.Pt(int(xpos), int(ypos))
+	if !me.Pos.In(image.Rect(0, 0, s.areawidth, s.areaheight)) {		// outside the actual Area; no event
+		return
+	}
 	if up {
 		me.Up = button
 	} else {

todo.md

@@ -16,7 +16,7 @@ important things:
 - make gcc (Unix)/clang (Mac OS X) pedantic about warnings/errors; also -Werror
 	- problem: cgo-generated files trip -Werror up; I can't seem to turn off unused argument warnings with the -Wall/-Wextra/-pedantic options
 - consolidate scroll view code in GTK+ and Mac OS X
-- make sure mouse events don't trigger if the control size is larger than the Area size and the mouse event happens outside the Area range on all platforms
+- make sure mouse events trigger when we move the mouse over an Area with a button held on OS X
 - area test time label weirdness
 	- does not show anything past the date on windows
 	- does not show initially on OS X; it shows up once you resize, and even shows up after you resize back to the original size