UI: Add template_search (version of template_ID for non-IDs)

Adds a version of template_ID that can be used for non-ID properties.
The property to search for and the collection to search in has to be
passed to it.
Like template_ID it also takes arguments to define a 'new' and 'unlink'
operator. They will be displayed as icon-only buttons then.
Also added a version that can display preview thumbnails.

Had to do some additional changes to make text-buttons support
displaying/modifying empty RNA properties.

This will be needed for workspaces, see D2451.

Reviewed By: campbellbarton

Differential Revision: https://developer.blender.org/D2666

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index ee15413b4d0..b3c95aa0712 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -912,6 +912,17 @@ void uiTemplateIDPreview(uiLayout *layout, struct bContext *C, struct PointerRNA
                          const char *newop, const char *openop, const char *unlinkop, int rows, int cols);
 void uiTemplateAnyID(uiLayout *layout, struct PointerRNA *ptr, const char *propname, 
                      const char *proptypename, const char *text);
+void uiTemplateSearch(
+        uiLayout *layout, struct bContext *C,
+        struct PointerRNA *ptr, const char *propname,
+        struct PointerRNA *searchptr, const char *searchpropname,
+        const char *newop, const char *unlinkop);
+void uiTemplateSearchPreview(
+        uiLayout *layout, struct bContext *C,
+        struct PointerRNA *ptr, const char *propname,
+        struct PointerRNA *searchptr, const char *searchpropname,
+        const char *newop, const char *unlinkop,
+        const int rows, const int cols);
 void uiTemplatePathBuilder(uiLayout *layout, struct PointerRNA *ptr, const char *propname, 
                            struct PointerRNA *root_ptr, const char *text);
 uiLayout *uiTemplateModifier(uiLayout *layout, struct bContext *C, struct PointerRNA *ptr);