macOS: add trackpad smart zoom event support

This is done with two-finger double tap on trackpads, and is usually used to
zoom into an element under the cursor.

It can now be used for toggling local view in the 3D viewport.

Differential Revision: https://developer.blender.org/D6588

3 files changed, 20 insertions, 1 deletions

diff --git a/intern/ghost/GHOST_Types.h b/intern/ghost/GHOST_Types.h
index c7c9f91a361..98dd1de867f 100644
--- a/intern/ghost/GHOST_Types.h
+++ b/intern/ghost/GHOST_Types.h
@@ -436,7 +436,8 @@ typedef enum {
   GHOST_kTrackpadEventScroll,
   GHOST_kTrackpadEventRotate,
   GHOST_kTrackpadEventSwipe, /* Reserved, not used for now */
-  GHOST_kTrackpadEventMagnify
+  GHOST_kTrackpadEventMagnify,
+  GHOST_kTrackpadEventSmartMagnify
 } GHOST_TTrackpadEventSubTypes;
 
 typedef struct {
diff --git a/intern/ghost/intern/GHOST_SystemCocoa.mm b/intern/ghost/intern/GHOST_SystemCocoa.mm
index e50e478b9fc..b0e11bd4a96 100644
--- a/intern/ghost/intern/GHOST_SystemCocoa.mm
+++ b/intern/ghost/intern/GHOST_SystemCocoa.mm
@@ -1726,6 +1726,19 @@ GHOST_TSuccess GHOST_SystemCocoa::handleMouseEvent(void *eventPtr)
                                         0));
     } break;
 
+    case NSEventTypeSmartMagnify: {
+      NSPoint mousePos = [cocoawindow mouseLocationOutsideOfEventStream];
+      GHOST_TInt32 x, y;
+      window->clientToScreenIntern(mousePos.x, mousePos.y, x, y);
+      pushEvent(new GHOST_EventTrackpad([event timestamp] * 1000,
+                                        window,
+                                        GHOST_kTrackpadEventSmartMagnify,
+                                        x,
+                                        y,
+                                        0,
+                                        0));
+    } break;
+
     case NSEventTypeRotate: {
       NSPoint mousePos = [cocoawindow mouseLocationOutsideOfEventStream];
       GHOST_TInt32 x, y;
diff --git a/intern/ghost/intern/GHOST_WindowViewCocoa.h b/intern/ghost/intern/GHOST_WindowViewCocoa.h
index cee40924b73..14c70382916 100644
--- a/intern/ghost/intern/GHOST_WindowViewCocoa.h
+++ b/intern/ghost/intern/GHOST_WindowViewCocoa.h
@@ -154,6 +154,11 @@
   systemCocoa->handleMouseEvent(event);
 }
 
+- (void)smartMagnifyWithEvent:(NSEvent *)event
+{
+  systemCocoa->handleMouseEvent(event);
+}
+
 - (void)rotateWithEvent:(NSEvent *)event
 {
   systemCocoa->handleMouseEvent(event);