#733 partial: Adds rotation gesture event on MacOS

FL/Enumerations.H

@@ -407,7 +407,13 @@ enum Fl_Event { // events
   /** A zoom event (ctrl/+/-/0/ or cmd/+/-/0/) was processed.
    Use Fl::add_handler() to be notified of this event.
    */
-  FL_ZOOM_EVENT = 27
+  FL_ZOOM_EVENT         = 27,
+  /** The user has made a rotation gesture (Mac OS platform only).
+   The Fl::event_dy() method can be used to find the rotation amount,
+   Fl::event_x() and Fl::event_y() are set as well.
+   This event is sent to the window's handle method.
+   */
+  FL_ROTATE_GESTURE     = 28
 // DEV NOTE: Keep this list in sync with FL/names.h
 };
 

FL/names.h

@@ -73,9 +73,10 @@ const char * const fl_eventnames[] =
   "FL_FULLSCREEN",
   "FL_ZOOM_GESTURE",
   "FL_ZOOM_EVENT",
-  "FL_EVENT_28", // not yet defined, just in case it /will/ be defined ...
+  "FL_ROTATE_GESTURE",
   "FL_EVENT_29", // not yet defined, just in case it /will/ be defined ...
-  "FL_EVENT_30"  // not yet defined, just in case it /will/ be defined ...
+  "FL_EVENT_30", // not yet defined, just in case it /will/ be defined ...
+  "FL_EVENT_31"  // not yet defined, just in case it /will/ be defined ...
 };
 
 /**

src/Fl_cocoa.mm

@@ -965,6 +965,32 @@ static void cocoaMagnifyHandler(NSEvent *theEvent)
 #endif
 }
 
+/*
+ * Cocoa Rotate Gesture Handler
+ */
+static void cocoaRotateHandler(NSEvent *theEvent)
+{
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
+  fl_lock_function();
+  Fl_Window *window = (Fl_Window*)[(FLWindow*)[theEvent window] getFl_Window];
+  if ( !window->shown() ) {
+    fl_unlock_function();
+    return;
+  }
+  Fl::first_window(window);
+  Fl::e_dy = [theEvent rotation]*1000;
+  if ( Fl::e_dy) {
+    NSPoint pos = [theEvent locationInWindow];
+    pos.y = window->h() - pos.y;
+    NSUInteger mods = [theEvent modifierFlags];
+    mods_to_e_state( mods );
+    update_e_xy_and_e_xy_root([theEvent window]);
+    Fl::handle( FL_ROTATE_GESTURE, window );
+  }
+  fl_unlock_function();
+#endif
+}
+
 /*
  * Cocoa Mouse Button Handler
  */
@@ -2439,6 +2465,9 @@ static FLTextInputContext* fltextinputcontext_instance = nil;
 - (void)magnifyWithEvent:(NSEvent *)theEvent {
   cocoaMagnifyHandler(theEvent);
 }
+- (void)rotateWithEvent:(NSEvent *)theEvent {
+  cocoaRotateHandler(theEvent);
+}
 - (void)keyDown:(NSEvent *)theEvent {
   //NSLog(@"keyDown:%@",[theEvent characters]);
   fl_lock_function();

test/keyboard.cxx

@@ -43,11 +43,22 @@ int handle(int e) {
   return (e == FL_SHORTCUT); // eat all keystrokes
 }
 
-int MyWindow::handle(int msg) {
-  if (msg==FL_MOUSEWHEEL) {
-    roller_x->value( roller_x->value() + Fl::e_dx * roller_x->step() );
-    roller_y->value( roller_y->value() + Fl::e_dy * roller_y->step() );
-    return 1;
+int MyWindow::handle(int event) {
+  static int r = 0;
+  switch (event) {
+    case FL_MOUSEWHEEL: {
+      int x = (int)(w_scroll->xvalue() - Fl::event_dx());
+      int y = (int)(w_scroll->yvalue() - Fl::event_dy());
+      w_scroll->value( (double)(x&31), (double)(y&31) );
+      return 1; }
+    case FL_ZOOM_GESTURE: {
+      int z = (int)(w_zoom->yvalue() + Fl::event_dy());
+      w_zoom->value( (double)(z&255), (double)(z&255) );
+      return 1; }
+    case FL_ROTATE_GESTURE: {
+      r = r - (Fl::event_dy()/100.0);
+      w_rotate->value( (double)(r&1023) );
+      return 1; }
   }
   return 0;
 }

test/keyboard_ui.fl

@@ -10,7 +10,7 @@ snap {
 Function {make_window()} {open
 } {
   Fl_Window my_window {open
-    xywh {448 339 495 215} type Double
+    xywh {407 352 550 215} type Double
     code0 {\#include "keyboard.h"}
     class MyWindow visible
   } {
@@ -690,8 +690,8 @@ Function {make_window()} {open
       xywh {15 20 170 30} labelsize 9 align 5
     }
     Fl_Box {} {
-      label {Fl::event_state():} selected
-      xywh {400 15 80 0} labelsize 9 align 5
+      label {Fl::event_state():}
+      xywh {400 0 80 15} labelsize 9 align 22
     }
     Fl_Output text_output {
       label {Fl::event_text():}
@@ -709,15 +709,30 @@ Function {make_window()} {open
       callback key_cb
       xywh {420 70 20 20} labelsize 10
     }
-    Fl_Dial roller_x {
-      label {x:}
-      callback wheel_cb
-      xywh {440 70 20 20} box ROUND_UP_BOX selection_color 49 labelsize 9 align 5 step 0.1
+    Fl_Box {} {
+      label {Gestures:}
+      xywh {493 0 50 15} labelsize 9 align 22
     }
-    Fl_Dial roller_y {
-      label {y:}
-      callback wheel_cb
-      xywh {460 70 20 20} box ROUND_UP_BOX selection_color 49 labelsize 9 align 5 step 0.1
+    Fl_Box w_scroll {
+      label Mousewheel selected
+      xywh {495 20 40 40} box DOWN_BOX selection_color 8 labelsize 8 align 2
+      code0 {\#include <FL/Fl_Positioner.H>}
+      code1 {w_scroll->xbounds(0.0, 32.0); w_scroll->ybounds(0.0, 32.0);}
+      code2 {w_scroll->value(16.0, 16.0);}
+      class Fl_Positioner
+    }
+    Fl_Box w_zoom {
+      label Zoom
+      tooltip {the zoom gestures is not supported on all platforms} xywh {495 75 40 40} box DOWN_BOX selection_color 8 labelsize 8 align 2
+      code0 {\#include <FL/Fl_Positioner.H>}
+      code1 {w_zoom->xbounds(0.0, 256.0); w_zoom->ybounds(256.0, 0.0);}
+      code2 {w_zoom->value(128.0, 128.0);}
+      class Fl_Positioner
+    }
+    Fl_Dial w_rotate {
+      label Rotate
+      tooltip {the rotation gestures is not supported on all platforms} xywh {495 130 40 40} box ROUND_DOWN_BOX selection_color 49 labelsize 8 maximum 1023 step 1
+      code1 {w_rotate->angles(0, 360);}
     }
   }
 }