Transform/UI: individualize the option to use snap per editor type

`3DView`'s `use_snap` option has little or nothing to do with using
snapping in `UV`, `Nodes` or `Sequencer`.
So there are no real advantages to keeping these options in sync.

Therefore, individualize the option to use snap for each "spacetype".

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D13310

7 files changed, 104 insertions, 37 deletions

diff --git a/source/blender/blenloader/intern/versioning_300.c b/source/blender/blenloader/intern/versioning_300.c
index 32dcb977110..37356e58132 100644
--- a/source/blender/blenloader/intern/versioning_300.c
+++ b/source/blender/blenloader/intern/versioning_300.c
@@ -1481,6 +1481,10 @@ static void version_liboverride_rnacollections_insertion_animdata(ID *id)
 /* NOLINTNEXTLINE: readability-function-size */
 void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
 {
+  /* The #SCE_SNAP_SEQ flag has been removed in favor of the #SCE_SNAP which can be used for each
+   * snap_flag member individually. */
+  const int SCE_SNAP_SEQ = (1 << 7);
+
   if (!MAIN_VERSION_ATLEAST(bmain, 300, 1)) {
     /* Set default value for the new bisect_threshold parameter in the mirror modifier. */
     if (!DNA_struct_elem_find(fd->filesdna, "MirrorModifierData", "float", "bisect_threshold")) {
@@ -2585,5 +2589,16 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
         ts->uv_relax_method = UV_SCULPT_TOOL_RELAX_LAPLACIAN;
       }
     }
+    LISTBASE_FOREACH (Scene *, scene, &bmain->scenes) {
+      ToolSettings *tool_settings = scene->toolsettings;
+      tool_settings->snap_flag_seq = tool_settings->snap_flag & ~(SCE_SNAP | SCE_SNAP_SEQ);
+      if (tool_settings->snap_flag & SCE_SNAP_SEQ) {
+        tool_settings->snap_flag_seq |= SCE_SNAP;
+        tool_settings->snap_flag &= ~SCE_SNAP_SEQ;
+      }
+
+      tool_settings->snap_flag_node = tool_settings->snap_flag;
+      tool_settings->snap_uv_flag |= tool_settings->snap_flag & SCE_SNAP;
+    }
   }
 }
diff --git a/source/blender/editors/animation/anim_ops.c b/source/blender/editors/animation/anim_ops.c
index 1e8f46fd490..5b0c5eac11b 100644
--- a/source/blender/editors/animation/anim_ops.c
+++ b/source/blender/editors/animation/anim_ops.c
@@ -233,7 +233,7 @@ static bool use_sequencer_snapping(bContext *C)
 
   Scene *scene = CTX_data_scene(C);
   short snap_flag = SEQ_tool_settings_snap_flag_get(scene);
-  return (scene->toolsettings->snap_flag & SCE_SNAP_SEQ) &&
+  return (scene->toolsettings->snap_flag_seq & SCE_SNAP) &&
          (snap_flag & SEQ_SNAP_CURRENT_FRAME_TO_STRIPS);
 }
 
diff --git a/source/blender/editors/transform/transform.c b/source/blender/editors/transform/transform.c
index bb80109d8c9..92d312cebce 100644
--- a/source/blender/editors/transform/transform.c
+++ b/source/blender/editors/transform/transform.c
@@ -1513,14 +1513,42 @@ void saveTransform(bContext *C, TransInfo *t, wmOperator *op)
   if (t->flag & T_MODAL) {
     /* do we check for parameter? */
     if (transformModeUseSnap(t)) {
-      if (!(t->modifiers & MOD_SNAP) != !(ts->snap_flag & SCE_SNAP)) {
+      if (!(t->modifiers & MOD_SNAP) != !(t->tsnap.flag & SCE_SNAP)) {
+        char *snap_flag_ptr;
+
+        wmMsgParams_RNA msg_key_params = {{0}};
+        RNA_pointer_create(&t->scene->id, &RNA_ToolSettings, ts, &msg_key_params.ptr);
+
+        _WM_MESSAGE_EXTERN_BEGIN;
+        extern PropertyRNA rna_ToolSettings_use_snap;
+        extern PropertyRNA rna_ToolSettings_use_snap_node;
+        extern PropertyRNA rna_ToolSettings_use_snap_sequencer;
+        extern PropertyRNA rna_ToolSettings_use_snap_uv;
+        _WM_MESSAGE_EXTERN_END;
+        if (t->spacetype == SPACE_NODE) {
+          snap_flag_ptr = &ts->snap_flag_node;
+          msg_key_params.prop = &rna_ToolSettings_use_snap_node;
+        }
+        else if (t->spacetype == SPACE_IMAGE) {
+          snap_flag_ptr = &ts->snap_uv_flag;
+          msg_key_params.prop = &rna_ToolSettings_use_snap_uv;
+        }
+        else if (t->spacetype == SPACE_SEQ) {
+          snap_flag_ptr = &ts->snap_flag_seq;
+          msg_key_params.prop = &rna_ToolSettings_use_snap_sequencer;
+        }
+        else {
+          snap_flag_ptr = &ts->snap_flag;
+          msg_key_params.prop = &rna_ToolSettings_use_snap;
+        }
+
         if (t->modifiers & MOD_SNAP) {
-          ts->snap_flag |= SCE_SNAP;
+          *snap_flag_ptr |= SCE_SNAP;
         }
         else {
-          ts->snap_flag &= ~SCE_SNAP;
+          *snap_flag_ptr &= ~SCE_SNAP;
         }
-        WM_msg_publish_rna_prop(t->mbus, &t->scene->id, ts, ToolSettings, use_snap);
+        WM_msg_publish_rna_params(t->mbus, &msg_key_params);
       }
     }
   }
diff --git a/source/blender/editors/transform/transform.h b/source/blender/editors/transform/transform.h
index 21592032af2..713cf487ac7 100644
--- a/source/blender/editors/transform/transform.h
+++ b/source/blender/editors/transform/transform.h
@@ -295,7 +295,8 @@ typedef struct TransSnapPoint {
 } TransSnapPoint;
 
 typedef struct TransSnap {
-  short mode;
+  char flag;
+  char mode;
   short target;
   short modePoint;
   short modeSelect;
diff --git a/source/blender/editors/transform/transform_snap.c b/source/blender/editors/transform/transform_snap.c
index 2f3c021ba38..7ace6343985 100644
--- a/source/blender/editors/transform/transform_snap.c
+++ b/source/blender/editors/transform/transform_snap.c
@@ -561,7 +561,22 @@ static bool bm_face_is_snap_target(BMFace *f, void *UNUSED(user_data))
   return true;
 }
 
-static short snap_mode_from_scene(TransInfo *t)
+static char snap_flag_from_spacetype(TransInfo *t)
+{
+  ToolSettings *ts = t->settings;
+  if (t->spacetype == SPACE_NODE) {
+    return ts->snap_flag_node;
+  }
+  else if (t->spacetype == SPACE_IMAGE) {
+    return ts->snap_uv_flag;
+  }
+  else if (t->spacetype == SPACE_SEQ) {
+    return ts->snap_flag_seq;
+  }
+  return ts->snap_flag;
+}
+
+static short snap_mode_from_spacetype(TransInfo *t)
 {
   ToolSettings *ts = t->settings;
   short r_snap_mode = SCE_SNAP_MODE_INCREMENT;
@@ -580,7 +595,7 @@ static short snap_mode_from_scene(TransInfo *t)
   else if (t->spacetype == SPACE_SEQ) {
     r_snap_mode = SEQ_tool_settings_snap_mode_get(t->scene);
   }
-  else if (ELEM(t->spacetype, SPACE_VIEW3D, SPACE_IMAGE) && !(t->options & CTX_CAMERA)) {
+  else if ((t->spacetype == SPACE_VIEW3D) && !(t->options & CTX_CAMERA)) {
     /* All obedit types will match. */
     const int obedit_type = t->obedit_type;
     if ((t->options & (CTX_GPENCIL_STROKES | CTX_CURSOR | CTX_OBMODE_XFORM_OBDATA)) ||
@@ -652,7 +667,7 @@ static short snap_select_type_get(TransInfo *t)
 static void initSnappingMode(TransInfo *t)
 {
   ToolSettings *ts = t->settings;
-  t->tsnap.mode = snap_mode_from_scene(t);
+  t->tsnap.mode = snap_mode_from_spacetype(t);
   t->tsnap.modeSelect = snap_select_type_get(t);
 
   if ((t->spacetype != SPACE_VIEW3D) || !(ts->snap_mode & SCE_SNAP_MODE_FACE)) {
@@ -701,10 +716,9 @@ static void initSnappingMode(TransInfo *t)
 
 void initSnapping(TransInfo *t, wmOperator *op)
 {
-  ToolSettings *ts = t->settings;
-  short snap_target = t->settings->snap_target;
-
   resetSnapping(t);
+  t->tsnap.flag = snap_flag_from_spacetype(t);
+  short snap_target = t->settings->snap_target;
 
   /* if snap property exists */
   PropertyRNA *prop;
@@ -745,19 +759,14 @@ void initSnapping(TransInfo *t, wmOperator *op)
   }
   /* use scene defaults only when transform is modal */
   else if (t->flag & T_MODAL) {
-    if (ELEM(t->spacetype, SPACE_VIEW3D, SPACE_IMAGE, SPACE_NODE)) {
-      if (transformModeUseSnap(t) && (ts->snap_flag & SCE_SNAP)) {
-        t->modifiers |= MOD_SNAP;
-      }
-
-      t->tsnap.align = ((t->settings->snap_flag & SCE_SNAP_ROTATE) != 0);
-      t->tsnap.project = ((t->settings->snap_flag & SCE_SNAP_PROJECT) != 0);
-      t->tsnap.snap_self = !((t->settings->snap_flag & SCE_SNAP_NO_SELF) != 0);
-      t->tsnap.peel = ((t->settings->snap_flag & SCE_SNAP_PROJECT) != 0);
-    }
-    else if ((t->spacetype == SPACE_SEQ) && (ts->snap_flag & SCE_SNAP_SEQ)) {
+    if (transformModeUseSnap(t) && (t->tsnap.flag & SCE_SNAP)) {
       t->modifiers |= MOD_SNAP;
     }
+
+    t->tsnap.align = ((t->tsnap.flag & SCE_SNAP_ROTATE) != 0);
+    t->tsnap.project = ((t->tsnap.flag & SCE_SNAP_PROJECT) != 0);
+    t->tsnap.snap_self = !((t->tsnap.flag & SCE_SNAP_NO_SELF) != 0);
+    t->tsnap.peel = ((t->tsnap.flag & SCE_SNAP_PROJECT) != 0);
   }
 
   t->tsnap.target = snap_target;
diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index 512be41ce2c..2f8d1c5eafe 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -1469,13 +1469,18 @@ typedef struct ToolSettings {
   /* Transform */
   char transform_pivot_point;
   char transform_flag;
+  /** Snap elements (per spacetype). */
   char snap_mode;
   char snap_node_mode;
   char snap_uv_mode;
+  /** Generic flags (per spacetype). */
   char snap_flag;
-  /** UV equivalent of `snap_flag`, limited to: #SCE_SNAP_ABS_GRID. */
+  char snap_flag_node;
+  char snap_flag_seq;
   char snap_uv_flag;
+  /** Default snap source. */
   char snap_target;
+  /** Snap mask for transform modes. */
   char snap_transform_mode_flag;
 
   char proportional_edit, prop_mode;
@@ -1505,16 +1510,14 @@ typedef struct ToolSettings {
   char gpencil_selectmode_vertex;
 
   /* UV painting */
-  char _pad2[1];
   char uv_sculpt_settings;
   char uv_relax_method;
-  /* XXX: these sculpt_paint_* fields are deprecated, use the
-   * unified_paint_settings field instead! */
-  short sculpt_paint_settings DNA_DEPRECATED;
 
   char workspace_tool_type;
 
-  char _pad5[1];
+  /* XXX: these sculpt_paint_* fields are deprecated, use the
+   * unified_paint_settings field instead! */
+  short sculpt_paint_settings DNA_DEPRECATED;
   int sculpt_paint_unified_size DNA_DEPRECATED;
   float sculpt_paint_unified_unprojected_radius DNA_DEPRECATED;
   float sculpt_paint_unified_alpha DNA_DEPRECATED;
@@ -2055,7 +2058,6 @@ enum {
 #define SCE_SNAP_NO_SELF (1 << 4)
 #define SCE_SNAP_ABS_GRID (1 << 5)
 #define SCE_SNAP_BACKFACE_CULLING (1 << 6)
-#define SCE_SNAP_SEQ (1 << 7)
 
 /** #ToolSettings.snap_target */
 #define SCE_SNAP_TARGET_CLOSEST 0
diff --git a/source/blender/makesrna/intern/rna_scene.c b/source/blender/makesrna/intern/rna_scene.c
index 209331065ac..d398dadbec7 100644
--- a/source/blender/makesrna/intern/rna_scene.c
+++ b/source/blender/makesrna/intern/rna_scene.c
@@ -3149,6 +3149,25 @@ static void rna_def_tool_settings(BlenderRNA *brna)
   RNA_def_property_ui_icon(prop, ICON_SNAP_OFF, 1);
   RNA_def_property_update(prop, NC_SCENE | ND_TOOLSETTINGS, NULL); /* header redraw */
 
+  prop = RNA_def_property(srna, "use_snap_node", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "snap_flag_node", SCE_SNAP);
+  RNA_def_property_ui_text(prop, "Snap", "Snap Node during transform");
+  RNA_def_property_ui_icon(prop, ICON_SNAP_OFF, 1);
+  RNA_def_property_update(prop, NC_SCENE | ND_TOOLSETTINGS, NULL); /* header redraw */
+
+  prop = RNA_def_property(srna, "use_snap_sequencer", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "snap_flag_seq", SCE_SNAP);
+  RNA_def_property_ui_text(prop, "Use Snapping", "Snap to strip edges or current frame");
+  RNA_def_property_ui_icon(prop, ICON_SNAP_OFF, 1);
+  RNA_def_property_boolean_default(prop, true);
+  RNA_def_property_update(prop, NC_SCENE | ND_TOOLSETTINGS, NULL); /* Publish message-bus. */
+
+  prop = RNA_def_property(srna, "use_snap_uv", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "snap_uv_flag", SCE_SNAP);
+  RNA_def_property_ui_text(prop, "Snap", "Snap UV during transform");
+  RNA_def_property_ui_icon(prop, ICON_SNAP_OFF, 1);
+  RNA_def_property_update(prop, NC_SCENE | ND_TOOLSETTINGS, NULL); /* header redraw */
+
   prop = RNA_def_property(srna, "use_snap_align_rotation", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "snap_flag", SCE_SNAP_ROTATE);
   RNA_def_property_ui_text(
@@ -3163,13 +3182,6 @@ static void rna_def_tool_settings(BlenderRNA *brna)
       "Absolute grid alignment while translating (based on the pivot center)");
   RNA_def_property_update(prop, NC_SCENE | ND_TOOLSETTINGS, NULL); /* header redraw */
 
-  prop = RNA_def_property(srna, "use_snap_sequencer", PROP_BOOLEAN, PROP_NONE);
-  RNA_def_property_boolean_sdna(prop, NULL, "snap_flag", SCE_SNAP_SEQ);
-  RNA_def_property_ui_text(prop, "Use Snapping", "Snap to strip edges or current frame");
-  RNA_def_property_ui_icon(prop, ICON_SNAP_OFF, 1);
-  RNA_def_property_boolean_default(prop, true);
-  RNA_def_property_update(prop, NC_SCENE | ND_TOOLSETTINGS, NULL); /* Publish message-bus. */
-
   prop = RNA_def_property(srna, "snap_elements", PROP_ENUM, PROP_NONE);
   RNA_def_property_enum_bitflag_sdna(prop, NULL, "snap_mode");
   RNA_def_property_enum_items(prop, rna_enum_snap_element_items);