This commit frees list ui items from their dependencies to Panel, and hence from all the limitations this implied (mostly, the "only one list per panel" one).

It introduces a new (py-extendable and registrable) RNA type, UIList (roughly similar to Panel one), which currently contains only "standard" list's scroll pos and size (but may be expended to include e.g. some filtering data, etc.). This now makes lists completely independent from Panels!

This UIList has a draw_item callback which allows to customize items' drawing from python, that all addons can now use. Incidentally, this also greatly simplifies the C code of this widget, as we do not code any "special case" here anymore!

To make all this work, other changes were also necessary:

* Now all buttons (uiBut struct) have a 'custom_data' void pointer, used currently to store the uiList struct associated with a given uiLayoutListBox.

* DynamicPaintSurface now exposes a new bool, use_color_preview (readonly), saying whether that surface has some 3D view preview data or not.

* UILayout class has now four new (static) functions, to get the actual icon of any RNA object (important e.g. with materials or textures), and to get an enum item's UI name, description and icon.

* UILayout's label() func now takes an optional 'icon_value' integer parameter, which if not zero will override the 'icon' one (mandatory to use "custom" icons as generated for material/texture/... previews).
  Note: not sure whether we should add that one to all UILayout's prop funcs?

Note: will update addons using template list asap.

2 files changed, 8 insertions, 2 deletions

diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index 9a04138e72e..281d80a9d2b 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -56,6 +56,7 @@ struct PropertyRNA;
 struct ReportList;
 struct rcti;
 struct rctf;
+struct uiList;
 struct uiStyle;
 struct uiFontStyle;
 struct uiWidgetColors;
@@ -779,7 +780,7 @@ uiLayout *uiLayoutRow(uiLayout *layout, int align);
 uiLayout *uiLayoutColumn(uiLayout *layout, int align);
 uiLayout *uiLayoutColumnFlow(uiLayout *layout, int number, int align);
 uiLayout *uiLayoutBox(uiLayout *layout);
-uiLayout *uiLayoutListBox(uiLayout *layout, struct PointerRNA *ptr, struct PropertyRNA *prop,
+uiLayout *uiLayoutListBox(uiLayout *layout, struct uiList *uilst, struct PointerRNA *ptr, struct PropertyRNA *prop,
                           struct PointerRNA *actptr, struct PropertyRNA *actprop);
 uiLayout *uiLayoutAbsolute(uiLayout *layout, int align);
 uiLayout *uiLayoutSplit(uiLayout *layout, float percentage, int align);
@@ -825,7 +826,9 @@ void uiTemplateTextureImage(uiLayout *layout, struct bContext *C, struct Tex *te
 void uiTemplateReportsBanner(uiLayout *layout, struct bContext *C);
 void uiTemplateKeymapItemProperties(uiLayout *layout, struct PointerRNA *ptr);
 
-void uiTemplateList(uiLayout *layout, struct bContext *C, struct PointerRNA *ptr, const char *propname, struct PointerRNA *activeptr, const char *activeprop, const char *prop_list, int rows, int maxrows, int type);
+void uiTemplateList(uiLayout *layout, struct bContext *C, const char *listtype_name, const char *list_id,
+                    struct PointerRNA *dataptr, const char *propname, struct PointerRNA *active_dataptr,
+                    const char *active_propname, int rows, int maxrows, int layout_type);
 void uiTemplateNodeLink(uiLayout *layout, struct bNodeTree *ntree, struct bNode *node, struct bNodeSocket *input);
 void uiTemplateNodeView(uiLayout *layout, struct bContext *C, struct bNodeTree *ntree, struct bNode *node, struct bNodeSocket *input);
 void uiTemplateTextureUser(uiLayout *layout, struct bContext *C);
diff --git a/source/blender/editors/include/UI_interface_icons.h b/source/blender/editors/include/UI_interface_icons.h
index aa94bdec724..f578d68b852 100644
--- a/source/blender/editors/include/UI_interface_icons.h
+++ b/source/blender/editors/include/UI_interface_icons.h
@@ -32,12 +32,14 @@
 #ifndef __UI_INTERFACE_ICONS_H__
 #define __UI_INTERFACE_ICONS_H__
 
+struct bContext;
 struct Image;
 struct ImBuf;
 struct World;
 struct Tex;
 struct Lamp;
 struct Material;
+struct PointerRNA;
 
 typedef struct IconFile {
 	struct IconFile *next, *prev;
@@ -74,5 +76,6 @@ void UI_icons_free_drawinfo(void *drawinfo);
 struct ListBase *UI_iconfile_list(void);
 int UI_iconfile_get_index(const char *filename);
 
+int UI_rnaptr_icon_get(struct bContext *C, struct PointerRNA *ptr, int rnaicon, int big);
 
 #endif /*  __UI_INTERFACE_ICONS_H__ */