UI: Move all Selected NLA-Strips when Dragging

Part of T57918. Selecting and dragging items were conflicting actions
previously when both were using the same mouse button. This avoids the
conflict.

See be2cd4bb5325 for details on behavior.

1 files changed, 36 insertions, 11 deletions

diff --git a/source/blender/editors/space_nla/nla_select.c b/source/blender/editors/space_nla/nla_select.c
index 1abf1a64263..938e7f09881 100644
--- a/source/blender/editors/space_nla/nla_select.c
+++ b/source/blender/editors/space_nla/nla_select.c
@@ -597,13 +597,19 @@ void NLA_OT_select_leftright(wmOperatorType *ot)
 /* ******************** Mouse-Click Select Operator *********************** */
 
 /* select strip directly under mouse */
-static void mouse_nla_strips(
-    bContext *C, bAnimContext *ac, const int mval[2], short select_mode, const bool deselect_all)
+static int mouse_nla_strips(bContext *C,
+                            bAnimContext *ac,
+                            const int mval[2],
+                            short select_mode,
+                            const bool deselect_all,
+                            bool wait_to_deselect_others)
 {
   Scene *scene = ac->scene;
 
   bAnimListElem *ale = NULL;
   NlaStrip *strip = NULL;
+  int ret_value = OPERATOR_FINISHED;
+
   nlaedit_strip_at_region_position(ac, mval[0], mval[1], &ale, &strip);
 
   /* if currently in tweakmode, exit tweakmode before changing selection states
@@ -613,6 +619,10 @@ static void mouse_nla_strips(
     WM_operator_name_call(C, "NLA_OT_tweakmode_exit", WM_OP_EXEC_DEFAULT, NULL);
   }
 
+  if (select_mode != SELECT_REPLACE) {
+    wait_to_deselect_others = false;
+  }
+
   /* For replacing selection, if we have something to select, we have to clear existing selection.
    * The same goes if we found nothing to select, and deselect_all is true
    * (deselect on nothing behavior). */
@@ -620,11 +630,16 @@ static void mouse_nla_strips(
     /* reset selection mode for next steps */
     select_mode = SELECT_ADD;
 
-    /* deselect all strips */
-    deselect_nla_strips(ac, 0, SELECT_SUBTRACT);
+    if (strip && wait_to_deselect_others && (strip->flag & DESELECT_STRIPS_CLEARACTIVE)) {
+      ret_value = OPERATOR_RUNNING_MODAL;
+    }
+    else {
+      /* deselect all strips */
+      deselect_nla_strips(ac, 0, SELECT_SUBTRACT);
 
-    /* deselect all other channels first */
-    ANIM_deselect_anim_channels(ac, ac->data, ac->datatype, 0, ACHANNEL_SETFLAG_CLEAR);
+      /* deselect all other channels first */
+      ANIM_deselect_anim_channels(ac, ac->data, ac->datatype, 0, ACHANNEL_SETFLAG_CLEAR);
+    }
   }
 
   /* only select strip if we clicked on a valid channel and hit something */
@@ -658,14 +673,17 @@ static void mouse_nla_strips(
     /* free this channel */
     MEM_freeN(ale);
   }
+
+  return ret_value;
 }
 
 /* ------------------- */
 
 /* handle clicking */
-static int nlaedit_clickselect_invoke(bContext *C, wmOperator *op, const wmEvent *event)
+static int nlaedit_clickselect_exec(bContext *C, wmOperator *op)
 {
   bAnimContext ac;
+  int ret_value;
 
   /* get editor data */
   if (ANIM_animdata_get_context(C, &ac) == 0) {
@@ -675,15 +693,19 @@ static int nlaedit_clickselect_invoke(bContext *C, wmOperator *op, const wmEvent
   /* select mode is either replace (deselect all, then add) or add/extend */
   const short selectmode = RNA_boolean_get(op->ptr, "extend") ? SELECT_INVERT : SELECT_REPLACE;
   const bool deselect_all = RNA_boolean_get(op->ptr, "deselect_all");
+  const bool wait_to_deselect_others = RNA_boolean_get(op->ptr, "wait_to_deselect_others");
+  int mval[2];
+  mval[0] = RNA_int_get(op->ptr, "mouse_x");
+  mval[1] = RNA_int_get(op->ptr, "mouse_y");
 
   /* select strips based upon mouse position */
-  mouse_nla_strips(C, &ac, event->mval, selectmode, deselect_all);
+  ret_value = mouse_nla_strips(C, &ac, mval, selectmode, deselect_all, wait_to_deselect_others);
 
   /* set notifier that things have changed */
   WM_event_add_notifier(C, NC_ANIMATION | ND_NLA | NA_SELECTED, NULL);
 
   /* for tweak grab to work */
-  return OPERATOR_FINISHED | OPERATOR_PASS_THROUGH;
+  return ret_value | OPERATOR_PASS_THROUGH;
 }
 
 void NLA_OT_click_select(wmOperatorType *ot)
@@ -695,14 +717,17 @@ void NLA_OT_click_select(wmOperatorType *ot)
   ot->idname = "NLA_OT_click_select";
   ot->description = "Handle clicks to select NLA Strips";
 
-  /* api callbacks - absolutely no exec() this yet... */
-  ot->invoke = nlaedit_clickselect_invoke;
+  /* callbacks */
   ot->poll = ED_operator_nla_active;
+  ot->exec = nlaedit_clickselect_exec;
+  ot->invoke = WM_generic_select_invoke;
+  ot->modal = WM_generic_select_modal;
 
   /* flags */
   ot->flag = OPTYPE_UNDO;
 
   /* properties */
+  WM_operator_properties_generic_select(ot);
   prop = RNA_def_boolean(ot->srna, "extend", 0, "Extend Select", "");  // SHIFTKEY
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);