Datablock ID Properties

The absence of datablock properties "will certainly be resolved soon as the need for them is becoming obvious" said the [[http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.67/Python_Nodes|Python Nodes release notes]]. So this patch allows Python scripts to create ID Properties which reference datablocks.
This functionality is implemented for `PointerProperty` and now such properties can be created with Python.

In addition to the standard update callback, `PointerProperty` can have a `poll` callback (standard RNA) which is useful for search menus. For details see the test included in this patch.

Original author: @artfunkel

Alexander (Blend4Web Team)

Reviewers: brecht, artfunkel, mont29, campbellbarton

Reviewed By: mont29, campbellbarton

Subscribers: jta, sergey, campbellbarton, wisaac, poseidon4o, mont29, homyachetser, Evgeny_Rodygin, AlexKowel, yurikovelenov, fjuhec, sharlybg, cardboard, duarteframos, blueprintrandom, a.romanov, BYOB, disnel, aditiapratama, bliblubli, dfelinto, lukastoenne

Maniphest Tasks: T37754

Differential Revision: https://developer.blender.org/D113

1 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_define.c b/source/blender/makesrna/intern/rna_define.c
index 1d232d2df39..49983b0bc2b 100644
--- a/source/blender/makesrna/intern/rna_define.c
+++ b/source/blender/makesrna/intern/rna_define.c
@@ -2168,6 +2168,16 @@ void RNA_def_property_update_runtime(PropertyRNA *prop, const void *func)
 	prop->update = (void *)func;
 }
 
+void RNA_def_property_poll_runtime(PropertyRNA *prop, const void *func)
+{
+	if (prop->type == PROP_POINTER) {
+		((PointerPropertyRNA *)prop)->poll = func;
+	}
+	else {
+		fprintf(stderr, "%s: %s is not a Pointer Property.\n", __func__, prop->identifier);
+	}
+}
+
 void RNA_def_property_dynamic_array_funcs(PropertyRNA *prop, const char *getlength)
 {
 	if (!DefRNA.preprocess) {
@@ -2982,6 +2992,9 @@ PropertyRNA *RNA_def_pointer_runtime(StructOrFunctionRNA *cont_, const char *ide
 	
 	prop = RNA_def_property(cont, identifier, PROP_POINTER, PROP_NONE);
 	RNA_def_property_struct_runtime(prop, type);
+	if ((type->flag & STRUCT_ID) != 0) {
+		prop->flag |= PROP_EDITABLE;
+	}
 	RNA_def_property_ui_text(prop, ui_name, ui_description);
 
 	return prop;