Allow enabling individual touch gesture events

Implement support for enabling just some gesture events instead of
having to choose between getting none or all of them.

Also make wxTOUCH_NONE really disable the gestures events generation
instead of just doing nothing as before.

interface/wx/window.h

@@ -52,6 +52,68 @@ enum wxShowEffect
 };
 
 
+/**
+    Values for wxWindow::EnableTouchEvents() mask.
+
+    The values other than ::wxTOUCH_NONE and ::wxTOUCH_ALL_GESTURES can be
+    combined together to request enabling events for the specified gestures and
+    for them only.
+
+    @since 3.1.1
+ */
+enum
+{
+    /**
+        Don't generate any touch events.
+     */
+    wxTOUCH_NONE,
+
+    /**
+        Generate wxPanGestureEvent for vertical pans.
+
+        Note that under macOS horizontal pan events are also enabled when this
+        flag is specified.
+     */
+    wxTOUCH_VERTICAL_PAN_GESTURE,
+
+    /**
+        Generate wxPanGestureEvent for horizontal pans.
+
+        Note that under macOS vertical pan events are also enabled when this
+        flag is specified.
+     */
+    wxTOUCH_HORIZONTAL_PAN_GESTURE,
+
+    /**
+        Generate wxPanGestureEvent for any pans.
+
+        This is just a convenient combination of wxTOUCH_VERTICAL_PAN_GESTURE
+        and wxTOUCH_HORIZONTAL_PAN_GESTURE.
+     */
+    wxTOUCH_PAN_GESTURES,
+
+    /**
+        Generate wxZoomGestureEvent.
+     */
+    wxTOUCH_ZOOM_GESTURE,
+
+    /**
+        Generate wxRotateGestureEvent.
+     */
+    wxTOUCH_ROTATE_GESTURE,
+
+    /**
+        Generate events for press or tap gestures such as wxTwoFingerTapEvent,
+        wxLongPressEvent and wxPressAndTapEvent.
+     */
+    wxTOUCH_PRESS_GESTURES,
+
+    /**
+        Enable all supported gesture events.
+     */
+    wxTOUCH_ALL_GESTURES
+};
+
 /**
    flags for SendSizeEvent()
 */
@@ -3427,6 +3489,15 @@ public:
     /**
         Request generation of touch events for this window.
 
+        Each call to this function supersedes the previous ones, i.e. if you
+        want to receive events for both zoom and rotate gestures, you need to
+        call
+        @code
+            EnableTouchEvents(wxTOUCH_ZOOM_GESTURE | wxTOUCH_ROTATE_GESTURE);
+        @endcode
+        instead of calling it twice in a row as the second call would disable
+        the first gesture.
+
         @param eventsMask Either wxTOUCH_NONE or wxTOUCH_ALL_GESTURES to
             disable or enable gesture events for this window.