Properly gray out modifiers when FCurve has them turned off

Very unstable, and the delete button doesn't work. It's probably
best to just expose graph_panel_context and the equivalent NLA function.

source/blender/blenkernel/intern/fmodifier.c

@@ -1133,7 +1133,7 @@ FModifier *add_fmodifier(ListBase *modifiers, int type, FCurve *owner_fcu)
   /* add modifier itself */
   fcm = MEM_callocN(sizeof(FModifier), "F-Curve Modifier");
   fcm->type = type;
-  fcm->flag = FMODIFIER_FLAG_EXPANDED;
+  fcm->ui_expand_flag = (1 << 0); /* Expand the main panel, not the subpanels. */
   fcm->curve = owner_fcu;
   fcm->influence = 1.0f;
   BLI_addtail(modifiers, fcm);

source/blender/blenloader/intern/versioning_290.c

@@ -875,5 +875,19 @@ void blo_do_versions_290(FileData *fd, Library *UNUSED(lib), Main *bmain)
    */
   {
     /* Keep this block, even when empty. */
+
+    /* Move to storing expansion for all panels of FModifiers. */
+    LISTBASE_FOREACH (bAction *, act, &bmain->actions) {
+      LISTBASE_FOREACH (FCurve *, fcu, &act->curves) {
+        LISTBASE_FOREACH (FModifier *, fcm, &fcu->modifiers) {
+          if (fcm->flag & FMODIFIER_FLAG_EXPANDED) {
+            fcm->ui_expand_flag = 1;
+          }
+          else {
+            fcm->ui_expand_flag = 0;
+          }
+        }
+      }
+    }
   }
 }

source/blender/editors/include/ED_anim_api.h

@@ -33,7 +33,11 @@ struct ID;
 struct ListBase;
 
 struct ARegion;
+struct ARegionType;
 struct Main;
+struct NlaStrip;
+struct FModifier;
+struct PanelType;
 struct ReportList;
 struct ScrArea;
 struct SpaceLink;
@@ -675,11 +679,38 @@ void ANIM_draw_framerange(struct Scene *scene, struct View2D *v2d);
 
 /* ------------- UI Panel Drawing -------------- */
 
-/* draw a given F-Modifier for some layout/UI-Block */
-void ANIM_uiTemplate_fmodifier_draw(struct uiLayout *layout,
-                                    struct ID *fcurve_owner_id,
-                                    ListBase *modifiers,
-                                    struct FModifier *fcm);
+struct NlaStrip *ANIM_nla_context_strip(const struct bContext *C);
+struct FCurve *ANIM_graph_context_fcurve(const struct bContext *C);
+
+typedef bool (*PanelTypePollFn)(const struct bContext *C, struct PanelType *pt);
+typedef void (*uiListPanelIDFromDataFunc)(void *data_link, char *r_idname);
+
+void ANIM_fmodifier_panels(const struct bContext *C,
+                           struct ID *owner_id,
+                           ListBase *fmodifiers,
+                           uiListPanelIDFromDataFunc panel_id_fn);
+
+void ANIM_fmodifiers_generator_panel_register(struct ARegionType *region_type,
+                                              const char *id_prefix,
+                                              PanelTypePollFn poll_fn);
+void ANIM_fmodifiers_fn_generator_panel_register(struct ARegionType *region_type,
+                                                 const char *id_prefix,
+                                                 PanelTypePollFn poll_fn);
+void ANIM_fmodifiers_cycles_panel_register(struct ARegionType *region_type,
+                                           const char *id_prefix,
+                                           PanelTypePollFn poll_fn);
+void ANIM_fmodifiers_noise_panel_register(struct ARegionType *region_type,
+                                          const char *id_prefix,
+                                          PanelTypePollFn poll_fn);
+void ANIM_fmodifiers_envelope_panel_register(struct ARegionType *region_type,
+                                             const char *id_prefix,
+                                             PanelTypePollFn poll_fn);
+void ANIM_fmodifers_limits_panel_register(struct ARegionType *region_type,
+                                          const char *id_prefix,
+                                          PanelTypePollFn poll_fn);
+void ANIM_fmodifiers_stepped_panel_register(struct ARegionType *region_type,
+                                            const char *id_prefix,
+                                            PanelTypePollFn poll_fn);
 
 /* ------------- Copy/Paste Buffer -------------- */
 

source/blender/editors/space_graph/graph_buttons.c

@@ -105,6 +105,16 @@ static bool graph_panel_context(const bContext *C, bAnimListElem **ale, FCurve *
   return true;
 }
 
+FCurve *ANIM_graph_context_fcurve(const bContext *C)
+{
+  FCurve *fcu;
+  if (!graph_panel_context(C, NULL, &fcu)) {
+    return NULL;
+  }
+
+  return fcu;
+}
+
 static bool graph_panel_poll(const bContext *C, PanelType *UNUSED(pt))
 {
   return graph_panel_context(C, NULL, NULL);
@@ -1313,6 +1323,15 @@ static void graph_panel_drivers_popover(const bContext *C, Panel *panel)
 /* All the drawing code is in editors/animation/fmodifier_ui.c */
 
 #define B_FMODIFIER_REDRAW 20
+#define GRAPH_FMODIFIER_PANEL_PREFIX "GRAPH"
+
+static void graph_fmodifier_panel_id(void *fcm_link, char *r_name)
+{
+  FModifier *fcm = (FModifier *)fcm_link;
+  eFModifier_Types type = fcm->type;
+  const FModifierTypeInfo *fmi = get_fmodifier_typeinfo(type);
+  BLI_snprintf(r_name, BKE_ST_MAXNAME, "%s_PT_%s", GRAPH_FMODIFIER_PANEL_PREFIX, fmi->name);
+}
 
 static void do_graph_region_modifier_buttons(bContext *C, void *UNUSED(arg), int event)
 {
@@ -1328,10 +1347,8 @@ static void graph_panel_modifiers(const bContext *C, Panel *panel)
 {
   bAnimListElem *ale;
   FCurve *fcu;
-  FModifier *fcm;
-  uiLayout *col, *row;
+  uiLayout *row;
   uiBlock *block;
-  bool active;
 
   if (!graph_panel_context(C, &ale, &fcu)) {
     return;
@@ -1356,14 +1373,7 @@ static void graph_panel_modifiers(const bContext *C, Panel *panel)
     uiItemO(row, "", ICON_PASTEDOWN, "GRAPH_OT_fmodifier_paste");
   }
 
-  active = !(fcu->flag & FCURVE_MOD_OFF);
-  /* draw each modifier */
-  for (fcm = fcu->modifiers.first; fcm; fcm = fcm->next) {
-    col = uiLayoutColumn(panel->layout, true);
-    uiLayoutSetActive(col, active);
-
-    ANIM_uiTemplate_fmodifier_draw(col, ale->fcurve_owner_id, &fcu->modifiers, fcm);
-  }
+  ANIM_fmodifier_panels(C, ale->fcurve_owner_id, &fcu->modifiers, graph_fmodifier_panel_id);
 
   MEM_freeN(ale);
 }
@@ -1427,10 +1437,20 @@ void graph_buttons_register(ARegionType *art)
   strcpy(pt->label, N_("Modifiers"));
   strcpy(pt->category, "Modifiers");
   strcpy(pt->translation_context, BLT_I18NCONTEXT_DEFAULT_BPYRNA);
+  pt->flag = PNL_NO_HEADER;
   pt->draw = graph_panel_modifiers;
   pt->poll = graph_panel_poll;
   BLI_addtail(&art->paneltypes, pt);
 
+  const char *fmodifier_panel_prefix = GRAPH_FMODIFIER_PANEL_PREFIX;
+  ANIM_fmodifiers_generator_panel_register(art, fmodifier_panel_prefix, graph_panel_poll);
+  ANIM_fmodifiers_fn_generator_panel_register(art, fmodifier_panel_prefix, graph_panel_poll);
+  ANIM_fmodifiers_cycles_panel_register(art, fmodifier_panel_prefix, graph_panel_poll);
+  ANIM_fmodifiers_noise_panel_register(art, fmodifier_panel_prefix, graph_panel_poll);
+  ANIM_fmodifiers_envelope_panel_register(art, fmodifier_panel_prefix, graph_panel_poll);
+  ANIM_fmodifers_limits_panel_register(art, fmodifier_panel_prefix, graph_panel_poll);
+  ANIM_fmodifiers_stepped_panel_register(art, fmodifier_panel_prefix, graph_panel_poll);
+
   pt = MEM_callocN(sizeof(PanelType), "spacetype graph panel view");
   strcpy(pt->idname, "GRAPH_PT_view");
   strcpy(pt->label, N_("Show Cursor"));

source/blender/editors/space_nla/nla_buttons.c

@@ -37,6 +37,7 @@
 #include "BLT_translation.h"
 
 #include "BKE_context.h"
+#include "BKE_fcurve.h"
 #include "BKE_nla.h"
 #include "BKE_screen.h"
 
@@ -184,6 +185,17 @@ bool nla_panel_context(const bContext *C,
   return (found != 0);
 }
 
+NlaStrip *ANIM_nla_context_strip(const bContext *C)
+{
+  PointerRNA strip_ptr;
+  if (!nla_panel_context(C, NULL, NULL, &strip_ptr)) {
+    return NULL;
+  }
+  NlaStrip *strip = strip_ptr.data;
+
+  return strip;
+}
+
 #if 0
 static bool nla_panel_poll(const bContext *C, PanelType *pt)
 {
@@ -535,13 +547,23 @@ static void nla_panel_animated_strip_time(const bContext *C, Panel *panel)
   uiItemR(layout, &strip_ptr, "strip_time", 0, NULL, ICON_NONE);
 }
 
+#define NLA_FMODIFIER_PANEL_PREFIX "NLA"
+
+static void nla_fmodifier_panel_id(void *fcm_link, char *r_name)
+{
+  FModifier *fcm = (FModifier *)fcm_link;
+  eFModifier_Types type = fcm->type;
+  snprintf(r_name, BKE_ST_MAXNAME, "%s_PT_", NLA_FMODIFIER_PANEL_PREFIX);
+  const FModifierTypeInfo *fmi = get_fmodifier_typeinfo(type);
+  BLI_snprintf(r_name, BKE_ST_MAXNAME, "%s_PT_%s", NLA_FMODIFIER_PANEL_PREFIX, fmi->name);
+}
+
 /* F-Modifiers for active NLA-Strip */
 static void nla_panel_modifiers(const bContext *C, Panel *panel)
 {
   PointerRNA strip_ptr;
   NlaStrip *strip;
-  FModifier *fcm;
-  uiLayout *col, *row;
+  uiLayout *row;
   uiBlock *block;
 
   /* check context and also validity of pointer */
@@ -569,12 +591,7 @@ static void nla_panel_modifiers(const bContext *C, Panel *panel)
     uiItemO(row, "", ICON_PASTEDOWN, "NLA_OT_fmodifier_paste");
   }
 
-  /* draw each modifier */
-  for (fcm = strip->modifiers.first; fcm; fcm = fcm->next) {
-    col = uiLayoutColumn(panel->layout, true);
-
-    ANIM_uiTemplate_fmodifier_draw(col, strip_ptr.owner_id, &strip->modifiers, fcm);
-  }
+  ANIM_fmodifier_panels(C, strip_ptr.owner_id, &strip->modifiers, nla_fmodifier_panel_id);
 }
 
 /* ******************* general ******************************** */
@@ -657,5 +674,15 @@ void nla_buttons_register(ARegionType *art)
   strcpy(pt->translation_context, BLT_I18NCONTEXT_DEFAULT_BPYRNA);
   pt->draw = nla_panel_modifiers;
   pt->poll = nla_strip_eval_panel_poll;
+  pt->flag = PNL_NO_HEADER;
   BLI_addtail(&art->paneltypes, pt);
+
+  const char *modifier_panel_prefix = NLA_FMODIFIER_PANEL_PREFIX;
+  ANIM_fmodifiers_generator_panel_register(art, modifier_panel_prefix, nla_strip_eval_panel_poll);
+  ANIM_fmodifiers_fn_generator_panel_register(
+      art, modifier_panel_prefix, nla_strip_eval_panel_poll);
+  ANIM_fmodifiers_noise_panel_register(art, modifier_panel_prefix, nla_strip_eval_panel_poll);
+  ANIM_fmodifiers_envelope_panel_register(art, modifier_panel_prefix, nla_strip_eval_panel_poll);
+  ANIM_fmodifers_limits_panel_register(art, modifier_panel_prefix, nla_strip_eval_panel_poll);
+  ANIM_fmodifiers_stepped_panel_register(art, modifier_panel_prefix, nla_strip_eval_panel_poll);
 }

source/blender/makesdna/DNA_anim_types.h

@@ -57,6 +57,10 @@ typedef struct FModifier {
   short type;
   /** Settings for the modifier. */
   short flag;
+  /** Expansion state for the modifier panel and subpanels. */
+  short ui_expand_flag;
+
+  char _pad[6];
 
   /** The amount that the modifier should influence the value. */
   float influence;
@@ -96,8 +100,10 @@ typedef enum eFModifier_Types {
 typedef enum eFModifier_Flags {
   /** Modifier is not able to be evaluated for some reason, and should be skipped (internal). */
   FMODIFIER_FLAG_DISABLED = (1 << 0),
+#ifdef DNA_DEPRECATED_ALLOW
   /** Modifier's data is expanded (in UI). */
   FMODIFIER_FLAG_EXPANDED = (1 << 1),
+#endif
   /** Modifier is active one (in UI) for editing purposes. */
   FMODIFIER_FLAG_ACTIVE = (1 << 2),
   /** User wants modifier to be skipped. */

source/blender/makesrna/intern/rna_fcurve.c

@@ -1109,6 +1109,17 @@ static void rna_Keyframe_update(Main *bmain, Scene *UNUSED(scene), PointerRNA *p
   rna_tag_animation_update(bmain, ptr->owner_id);
 }
 
+static void rna_FModifier_show_expanded_set(PointerRNA *ptr, bool value)
+{
+  FModifier *fcm = ptr->data;
+  if (value) {
+    fcm->ui_expand_flag |= (1 << 0);
+  }
+  else {
+    fcm->ui_expand_flag &= ~(1 << 0);
+  }
+}
+
 #else
 
 static void rna_def_fmodifier_generator(BlenderRNA *brna)
@@ -1199,7 +1210,7 @@ static void rna_def_fmodifier_function_generator(BlenderRNA *brna)
 
   prop = RNA_def_property(srna, "phase_multiplier", PROP_FLOAT, PROP_NONE);
   RNA_def_property_ui_text(
-      prop, "Phase Multiplier", "Scale factor determining the 'speed' of the function");
+      prop, "Phase Multiple", "Scale factor determining the 'speed' of the function");
   RNA_def_property_update(prop, NC_ANIMATION | ND_KEYFRAME | NA_EDITED, "rna_FModifier_update");
 
   prop = RNA_def_property(srna, "phase_offset", PROP_FLOAT, PROP_NONE);
@@ -1612,13 +1623,14 @@ static void rna_def_fmodifier(BlenderRNA *brna)
   /* settings */
   prop = RNA_def_property(srna, "show_expanded", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_flag(prop, PROP_NO_DEG_UPDATE);
-  RNA_def_property_boolean_sdna(prop, NULL, "flag", FMODIFIER_FLAG_EXPANDED);
+  RNA_def_property_boolean_sdna(prop, NULL, "ui_expand_flag", 0);
+  RNA_def_property_boolean_funcs(prop, NULL, "rna_FModifier_show_expanded_set");
   RNA_def_property_ui_text(prop, "Expanded", "F-Curve Modifier's panel is expanded in UI");
   RNA_def_property_ui_icon(prop, ICON_DISCLOSURE_TRI_RIGHT, 1);
 
   prop = RNA_def_property(srna, "mute", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "flag", FMODIFIER_FLAG_MUTED);
-  RNA_def_property_ui_text(prop, "Muted", "Disable F-Curve Modifier evaluation");
+  RNA_def_property_ui_text(prop, "Enabled", "Enable F-Curve modifier evaluation");
   RNA_def_property_update(prop, NC_ANIMATION | ND_KEYFRAME_PROP, "rna_FModifier_update");
   RNA_def_property_ui_icon(prop, ICON_CHECKBOX_HLT, -1);
 
@@ -1632,7 +1644,7 @@ static void rna_def_fmodifier(BlenderRNA *brna)
   /* TODO: setting this to true must ensure that all others in stack are turned off too... */
   prop = RNA_def_property(srna, "active", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "flag", FMODIFIER_FLAG_ACTIVE);
-  RNA_def_property_ui_text(prop, "Active", "F-Curve Modifier is the one being edited");
+  RNA_def_property_ui_text(prop, "Active", "F-Curve modifier will show settings in the editor");
   RNA_def_property_boolean_funcs(prop, NULL, "rna_FModifier_active_set");
   RNA_def_property_update(prop, NC_ANIMATION | ND_KEYFRAME_PROP, "rna_FModifier_active_update");
   RNA_def_property_ui_icon(prop, ICON_RADIOBUT_OFF, 1);
@@ -1646,8 +1658,6 @@ static void rna_def_fmodifier(BlenderRNA *brna)
       "F-Curve Modifier is only applied for the specified frame range to help "
       "mask off effects in order to chain them");
   RNA_def_property_update(prop, NC_ANIMATION | ND_KEYFRAME_PROP, "rna_FModifier_update");
-  RNA_def_property_ui_icon(
-      prop, ICON_DISCLOSURE_TRI_RIGHT, 1); /* XXX: depends on UI implementation */
 
   prop = RNA_def_property(srna, "frame_start", PROP_FLOAT, PROP_NONE);
   RNA_def_property_float_sdna(prop, NULL, "sfra");
@@ -1689,8 +1699,6 @@ static void rna_def_fmodifier(BlenderRNA *brna)
   RNA_def_property_ui_text(
       prop, "Use Influence", "F-Curve Modifier's effects will be tempered by a default factor");
   RNA_def_property_update(prop, NC_ANIMATION | ND_KEYFRAME_PROP, "rna_FModifier_update");
-  RNA_def_property_ui_icon(
-      prop, ICON_DISCLOSURE_TRI_RIGHT, 1); /* XXX: depends on UI implementation */
 
   prop = RNA_def_property(srna, "influence", PROP_FLOAT, PROP_FACTOR);
   RNA_def_property_float_sdna(prop, NULL, "influence");