source/blender/editors/include/ED_view3d.h

@@ -48,6 +48,7 @@ struct bPoseChannel;
 struct bScreen;
 struct rctf;
 struct rcti;
+struct wmEvent;
 struct wmGizmo;
 struct wmWindow;
 struct wmWindowManager;
@@ -863,6 +864,20 @@ int ED_view3d_backbuf_sample_size_clamp(struct ARegion *region, float dist);
 
 void ED_view3d_select_id_validate(struct ViewContext *vc);
 
+/** Check if the last auto-dist can be used. */
+bool ED_view3d_autodist_last_check(struct wmWindow *win, const struct wmEvent *event);
+/**
+ * \return true when `r_ofs` is set.
+ * \warning #ED_view3d_autodist_last_check should be called first to ensure the data is available.
+ */
+bool ED_view3d_autodist_last_get(struct wmWindow *win, float r_ofs[3]);
+void ED_view3d_autodist_last_set(struct wmWindow *win,
+                                 const struct wmEvent *event,
+                                 const float ofs[3],
+                                 const bool has_depth);
+/** Clear and free auto-dist data. */
+void ED_view3d_autodist_last_clear(struct wmWindow *win);
+
 /**
  * Get the world-space 3d location from a screen-space 2d point.
  * TODO: Implement #alphaoverride. We don't want to zoom into billboards.

source/blender/editors/space_view3d/view3d_navigate.c

@@ -274,16 +274,29 @@ ViewOpsData *viewops_data_create(bContext *C, const wmEvent *event, enum eViewOp
 
   /* we need the depth info before changing any viewport options */
   if (viewops_flag & VIEWOPS_FLAG_DEPTH_NAVIGATE) {
-    float fallback_depth_pt[3];
+    wmWindow *win = CTX_wm_window(C);
+    const bool use_depth_last = ED_view3d_autodist_last_check(win, event);
 
-    view3d_operator_needs_opengl(C); /* Needed for Z-buffer drawing. */
+    if (use_depth_last) {
+      vod->use_dyn_ofs = ED_view3d_autodist_last_get(win, vod->dyn_ofs);
+    }
+    else {
+      float fallback_depth_pt[3];
 
-    negate_v3_v3(fallback_depth_pt, rv3d->ofs);
+      view3d_operator_needs_opengl(C); /* Needed for Z-buffer drawing. */
 
-    vod->use_dyn_ofs = ED_view3d_autodist(
-        depsgraph, vod->region, vod->v3d, event->mval, vod->dyn_ofs, true, fallback_depth_pt);
+      negate_v3_v3(fallback_depth_pt, rv3d->ofs);
+
+      vod->use_dyn_ofs = ED_view3d_autodist(
+          depsgraph, vod->region, vod->v3d, event->mval, vod->dyn_ofs, true, fallback_depth_pt);
+
+      ED_view3d_autodist_last_set(win, event, vod->dyn_ofs, vod->use_dyn_ofs);
+    }
   }
   else {
+    wmWindow *win = CTX_wm_window(C);
+    ED_view3d_autodist_last_clear(win);
+
     vod->use_dyn_ofs = false;
   }
   vod->init.persp = rv3d->persp;

source/blender/editors/space_view3d/view3d_utils.c

@@ -1005,6 +1005,77 @@ void ED_view3d_quadview_update(ScrArea *area, ARegion *region, bool do_clip)
 
 /** \} */
 
+/* -------------------------------------------------------------------- */
+/** \name View Auto-Depth Last State Access
+ *
+ * Calling consecutive track-pad gestures reuses the previous offset to prevent
+ * each track-pad event using a different offset, see: #103263.
+ * \{ */
+
+static const char *view3d_autodepth_last_id = "view3d_autodist_last";
+
+/**
+ * Auto-depth values for #ED_view3d_autodist_last_check and related functions.
+ */
+typedef struct View3D_AutoDistLast {
+  float ofs[3];
+  bool has_depth;
+} View3D_AutoDistLast;
+
+bool ED_view3d_autodist_last_check(wmWindow *win, const wmEvent *event)
+{
+  if (event->flag & WM_EVENT_IS_CONSECUTIVE) {
+    const View3D_AutoDistLast *autodepth_last = WM_event_consecutive_data_get(
+        win, view3d_autodepth_last_id);
+    if (autodepth_last) {
+      return true;
+    }
+  }
+  return false;
+}
+
+void ED_view3d_autodist_last_clear(wmWindow *win)
+{
+  WM_event_consecutive_data_free(win);
+}
+
+void ED_view3d_autodist_last_set(wmWindow *win,
+                                 const wmEvent *event,
+                                 const float ofs[3],
+                                 const bool has_depth)
+{
+  ED_view3d_autodist_last_clear(win);
+
+  if (WM_event_consecutive_gesture_test(event)) {
+    View3D_AutoDistLast *autodepth_last = MEM_callocN(sizeof(*autodepth_last), __func__);
+
+    autodepth_last->has_depth = has_depth;
+    copy_v3_v3(autodepth_last->ofs, ofs);
+
+    WM_event_consecutive_data_set(win, view3d_autodepth_last_id, autodepth_last);
+  }
+}
+
+bool ED_view3d_autodist_last_get(wmWindow *win, float r_ofs[3])
+{
+  const View3D_AutoDistLast *autodepth_last = WM_event_consecutive_data_get(
+      win, view3d_autodepth_last_id);
+  /* #ED_view3d_autodist_last_check should be called first. */
+  BLI_assert(autodepth_last);
+  if (autodepth_last == NULL) {
+    return false;
+  }
+
+  if (autodepth_last->has_depth == false) {
+    zero_v3(r_ofs);
+    return false;
+  }
+  copy_v3_v3(r_ofs, autodepth_last->ofs);
+  return true;
+}
+
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name View Auto-Depth Utilities
  * \{ */

source/blender/makesdna/DNA_windowmanager_types.h

@@ -22,6 +22,7 @@ extern "C" {
 struct wmWindow;
 struct wmWindowManager;
 
+struct wmEvent_ConsecutiveData;
 struct wmEvent;
 struct wmKeyConfig;
 struct wmKeyMap;
@@ -280,6 +281,15 @@ typedef struct wmWindow {
   short grabcursor;
   /** Internal: tag this for extra mouse-move event,
    * makes cursors/buttons active on UI switching. */
+
+  /** Internal, lock pie creation from this event until released. */
+  short pie_event_type_lock;
+  /**
+   * Exception to the above rule for nested pies, store last pie event for operators
+   * that spawn a new pie right after destruction of last pie.
+   */
+  short pie_event_type_last;
+
   char addmousemove;
   char tag_cursor_refresh;
 
@@ -296,15 +306,12 @@ typedef struct wmWindow {
    */
   char event_queue_check_drag_handled;
 
-  char _pad0[1];
-
-  /** Internal, lock pie creation from this event until released. */
-  short pie_event_type_lock;
-  /**
-   * Exception to the above rule for nested pies, store last pie event for operators
-   * that spawn a new pie right after destruction of last pie.
-   */
-  short pie_event_type_last;
+  /** The last event type (that passed #WM_event_consecutive_gesture_test check). */
+  char event_queue_consecutive_gesture_type;
+  /** The cursor location when `event_queue_consecutive_gesture_type` was set. */
+  int event_queue_consecutive_gesture_xy[2];
+  /** See #WM_event_consecutive_data_get and related API. Freed when consecutive events end. */
+  struct wmEvent_ConsecutiveData *event_queue_consecutive_gesture_data;
 
   /**
    * Storage for event system.

source/blender/makesrna/intern/rna_wm.c

@@ -664,6 +664,12 @@ static bool rna_Event_is_repeat_get(PointerRNA *ptr)
   return (event->flag & WM_EVENT_IS_REPEAT) != 0;
 }
 
+static bool rna_Event_is_consecutive_get(PointerRNA *ptr)
+{
+  const wmEvent *event = ptr->data;
+  return (event->flag & WM_EVENT_IS_CONSECUTIVE) != 0;
+}
+
 static float rna_Event_pressure_get(PointerRNA *ptr)
 {
   const wmEvent *event = ptr->data;
@@ -2154,6 +2160,15 @@ static void rna_def_event(BlenderRNA *brna)
   RNA_def_property_boolean_funcs(prop, "rna_Event_is_repeat_get", NULL);
   RNA_def_property_ui_text(prop, "Is Repeat", "The event is generated by holding a key down");
 
+  /* Track-pad & NDOF. */
+  prop = RNA_def_property(srna, "is_consecutive", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+  RNA_def_property_boolean_funcs(prop, "rna_Event_is_consecutive_get", NULL);
+  RNA_def_property_ui_text(prop,
+                           "Is Consecutive",
+                           "Part of a track-pad or NDOF motion, "
+                           "interrupted by cursor motion, button or key press events");
+
   /* mouse */
   prop = RNA_def_property(srna, "mouse_x", PROP_INT, PROP_NONE);
   RNA_def_property_int_sdna(prop, NULL, "xy[0]");

source/blender/windowmanager/WM_api.h

@@ -1258,6 +1258,15 @@ bool WM_gesture_is_modal_first(const struct wmGesture *gesture);
 void WM_event_add_fileselect(struct bContext *C, struct wmOperator *op);
 void WM_event_fileselect_event(struct wmWindowManager *wm, void *ophandle, int eventval);
 
+/* Event consecutive data. */
+
+/** Return a borrowed reference to the custom-data. */
+void *WM_event_consecutive_data_get(wmWindow *win, const char *id);
+/** Set the custom-data (and own the pointer), free with #MEM_freeN. */
+void WM_event_consecutive_data_set(wmWindow *win, const char *id, void *custom_data);
+/** Clear and free the consecutive custom-data. */
+void WM_event_consecutive_data_free(wmWindow *win);
+
 /**
  * Sets the active region for this space from the context.
  *
@@ -1650,6 +1659,9 @@ char WM_event_utf8_to_ascii(const struct wmEvent *event) ATTR_NONNULL(1) ATTR_WA
  */
 bool WM_cursor_test_motion_and_update(const int mval[2]) ATTR_NONNULL(1) ATTR_WARN_UNUSED_RESULT;
 
+bool WM_event_consecutive_gesture_test(const wmEvent *event);
+bool WM_event_consecutive_gesture_test_break(const wmWindow *win, const wmEvent *event);
+
 int WM_event_drag_threshold(const struct wmEvent *event);
 bool WM_event_drag_test(const struct wmEvent *event, const int prev_xy[2]);
 bool WM_event_drag_test_with_delta(const struct wmEvent *event, const int delta[2]);

source/blender/windowmanager/WM_types.h

@@ -614,11 +614,19 @@ typedef enum eWM_EventFlag {
    * See #KMI_REPEAT_IGNORE for details on how key-map handling uses this.
    */
   WM_EVENT_IS_REPEAT = (1 << 1),
+  /**
+   * Generated for consecutive track-pad or NDOF-motion events,
+   * the repeat chain is broken by key/button events,
+   * or cursor motion exceeding #WM_EVENT_CURSOR_MOTION_THRESHOLD.
+   *
+   * Changing the type of track-pad or gesture event also breaks the chain.
+   */
+  WM_EVENT_IS_CONSECUTIVE = (1 << 2),
   /**
    * Mouse-move events may have this flag set to force creating a click-drag event
    * even when the threshold has not been met.
    */
-  WM_EVENT_FORCE_DRAG_THRESHOLD = (1 << 2),
+  WM_EVENT_FORCE_DRAG_THRESHOLD = (1 << 3),
 } eWM_EventFlag;
 ENUM_OPERATORS(eWM_EventFlag, WM_EVENT_FORCE_DRAG_THRESHOLD);
 

source/blender/windowmanager/intern/wm.c

@@ -179,6 +179,8 @@ static void window_manager_blend_read_data(BlendDataReader *reader, ID *id)
     win->event_queue_check_click = 0;
     win->event_queue_check_drag = 0;
     win->event_queue_check_drag_handled = 0;
+    win->event_queue_consecutive_gesture_type = 0;
+    win->event_queue_consecutive_gesture_data = NULL;
     BLO_read_data_address(reader, &win->stereo3d_format);
 
     /* Multi-view always fallback to anaglyph at file opening

source/blender/windowmanager/intern/wm_event_query.c

@@ -103,6 +103,7 @@ void WM_event_print(const wmEvent *event)
       struct FlagIdentifierPair flag_data[] = {
           {"SCROLL_INVERT", WM_EVENT_SCROLL_INVERT},
           {"IS_REPEAT", WM_EVENT_IS_REPEAT},
+          {"IS_CONSECUTIVE", WM_EVENT_IS_CONSECUTIVE},
           {"FORCE_DRAG_THRESHOLD", WM_EVENT_FORCE_DRAG_THRESHOLD},
       };
       event_ids_from_flag(flag_id, sizeof(flag_id), flag_data, ARRAY_SIZE(flag_data), event->flag);
@@ -336,6 +337,51 @@ bool WM_cursor_test_motion_and_update(const int mval[2])
 
 /** \} */
 
+/* -------------------------------------------------------------------- */
+/** \name Event Consecutive Checks
+ * \{ */
+
+/**
+ * Return true if this event type is a candidate for being flagged as consecutive.
+ *
+ * See: #WM_EVENT_IS_CONSECUTIVE doc-string.
+ */
+bool WM_event_consecutive_gesture_test(const wmEvent *event)
+{
+  return ISMOUSE_GESTURE(event->type) || (event->type == NDOF_MOTION);
+}
+
+/**
+ * Return true if this event should break the chain of consecutive gestures.
+ * Practically all intentional user input should, key presses or button clicks.
+ */
+bool WM_event_consecutive_gesture_test_break(const wmWindow *win, const wmEvent *event)
+{
+  /* Cursor motion breaks the chain. */
+  if (ISMOUSE_MOTION(event->type)) {
+    /* Mouse motion is checked because the user may navigate to a new area
+     * and perform the same gesture - logically it's best to view this as two separate gestures. */
+    if (len_manhattan_v2v2_int(event->xy, win->event_queue_consecutive_gesture_xy) >
+        WM_EVENT_CURSOR_MOTION_THRESHOLD) {
+      return true;
+    }
+  }
+  else if (ISKEYBOARD_OR_BUTTON(event->type)) {
+    /* Modifiers are excluded because from a user perspective,
+     * releasing a modifier (for e.g.) should not begin a new action. */
+    if (!ISKEYMODIFIER(event->type)) {
+      return true;
+    }
+  }
+  else if (event->type == WINDEACTIVATE) {
+    return true;
+  }
+
+  return false;
+}
+
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name Event Click/Drag Checks
  *

source/blender/windowmanager/intern/wm_event_system.cc

@@ -3966,6 +3966,27 @@ void wm_event_do_handlers(bContext *C)
       }
       const bool event_queue_check_drag_prev = win->event_queue_check_drag;
 
+      {
+        const bool is_consecutive = WM_event_consecutive_gesture_test(event);
+        if (win->event_queue_consecutive_gesture_type != 0) {
+          if (event->type == win->event_queue_consecutive_gesture_type) {
+            event->flag |= WM_EVENT_IS_CONSECUTIVE;
+          }
+          else if (is_consecutive || WM_event_consecutive_gesture_test_break(win, event)) {
+            CLOG_INFO(WM_LOG_HANDLERS, 1, "consecutive gesture break (%d)", event->type);
+            win->event_queue_consecutive_gesture_type = 0;
+            WM_event_consecutive_data_free(win);
+          }
+        }
+        else if (is_consecutive) {
+          CLOG_INFO(WM_LOG_HANDLERS, 1, "consecutive gesture begin (%d)", event->type);
+          win->event_queue_consecutive_gesture_type = event->type;
+          copy_v2_v2_int(win->event_queue_consecutive_gesture_xy, event->xy);
+          /* While this should not be set, it's harmless to free here. */
+          WM_event_consecutive_data_free(win);
+        }
+      }
+
       /* Active screen might change during handlers, update pointer. */
       screen = WM_window_get_active_screen(win);
 
@@ -4309,6 +4330,56 @@ void WM_event_add_fileselect(bContext *C, wmOperator *op)
 
 /** \} */
 
+/* -------------------------------------------------------------------- */
+/** \name Consecutive Event Access
+ * \{ */
+
+using wmEvent_ConsecutiveData = struct wmEvent_ConsecutiveData {
+  /** Owned custom-data. */
+  void *custom_data;
+  /** Unique identifier per struct type. */
+  char id[0];
+};
+
+void *WM_event_consecutive_data_get(wmWindow *win, const char *id)
+{
+  wmEvent_ConsecutiveData *cdata = win->event_queue_consecutive_gesture_data;
+  if (cdata && STREQ(cdata->id, id)) {
+    return cdata->custom_data;
+  }
+  return nullptr;
+}
+
+void WM_event_consecutive_data_set(wmWindow *win, const char *id, void *custom_data)
+{
+  if (win->event_queue_consecutive_gesture_data) {
+    WM_event_consecutive_data_free(win);
+  }
+
+  const size_t id_size = strlen(id) + 1;
+  wmEvent_ConsecutiveData *cdata = static_cast<wmEvent_ConsecutiveData *>(
+      MEM_mallocN(sizeof(*cdata) + id_size, __func__));
+  cdata->custom_data = custom_data;
+  memcpy((cdata + 1), id, id_size);
+  win->event_queue_consecutive_gesture_data = cdata;
+}
+
+void WM_event_consecutive_data_free(wmWindow *win)
+{
+  wmEvent_ConsecutiveData *cdata = win->event_queue_consecutive_gesture_data;
+  if (cdata == nullptr) {
+    return;
+  }
+
+  if (cdata->custom_data) {
+    MEM_freeN(cdata->custom_data);
+  }
+  MEM_freeN(cdata);
+  win->event_queue_consecutive_gesture_data = nullptr;
+}
+
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name Modal Operator Handling
  * \{ */

source/blender/windowmanager/intern/wm_window.c

@@ -256,6 +256,9 @@ void wm_window_free(bContext *C, wmWindowManager *wm, wmWindow *win)
   if (win->event_last_handled) {
     MEM_freeN(win->event_last_handled);
   }
+  if (win->event_queue_consecutive_gesture_data) {
+    WM_event_consecutive_data_free(win);
+  }
 
   if (win->cursor_keymap_status) {
     MEM_freeN(win->cursor_keymap_status);

source/blender/windowmanager/wm_event_types.h

@@ -60,7 +60,7 @@ enum {
   /* More mouse buttons - can't use 9 and 10 here (wheel) */
   BUTTON6MOUSE = 0x0012,
   BUTTON7MOUSE = 0x0013,
-  /* Extra track-pad gestures. */
+  /* Extra track-pad gestures (check #WM_EVENT_IS_CONSECUTIVE to detect motion events). */
   MOUSEPAN = 0x000e,
   MOUSEZOOM = 0x000f,
   MOUSEROTATE = 0x0010,
@@ -247,6 +247,10 @@ enum {
    * These must be kept in sync with `GHOST_NDOFManager.h`.
    * Ordering matters, exact values do not. */
 
+  /**
+   * Motion from 3D input (translation & rotation).
+   * Check #WM_EVENT_IS_CONSECUTIVE to detect motion events.
+   */
   NDOF_MOTION = 0x0190, /* 400 */
 
 #define _NDOF_MIN NDOF_MOTION