Spreadsheet: Dataset region for spreadsheet editor

This patch adds a left aligned sidebar to the spreadsheet editor. This
Sidebar can be used to navigate the geometry component types and
attribute domains. It also provides a quick overview of domain sizes.
It replaces the two dropdowns in the regions header.
Next step will be to add the domain cycling shortcut
using the CTRL + mouse wheel.

Reviewer: Dalai Felinto (dfelinto), Julian Eisel (Severin),
Hans Goudey (HooglyBoogly).

Differential Revision: https://developer.blender.org/D11046

2 files changed, 12 insertions, 4 deletions

diff --git a/source/blender/editors/include/ED_spreadsheet.h b/source/blender/editors/include/ED_spreadsheet.h
index 3a07b1b9d4b..88bc4738c0b 100644
--- a/source/blender/editors/include/ED_spreadsheet.h
+++ b/source/blender/editors/include/ED_spreadsheet.h
@@ -30,9 +30,9 @@ struct SpreadsheetContext *ED_spreadsheet_context_new(int type);
 void ED_spreadsheet_context_free(struct SpreadsheetContext *context);
 void ED_spreadsheet_context_path_clear(struct SpaceSpreadsheet *sspreadsheet);
 void ED_spreadsheet_context_path_update_tag(struct SpaceSpreadsheet *sspreadsheet);
-uint64_t ED_spreadsheet_context_path_hash(struct SpaceSpreadsheet *sspreadsheet);
+uint64_t ED_spreadsheet_context_path_hash(const struct SpaceSpreadsheet *sspreadsheet);
 
-struct ID *ED_spreadsheet_get_current_id(struct SpaceSpreadsheet *sspreadsheet);
+struct ID *ED_spreadsheet_get_current_id(const struct SpaceSpreadsheet *sspreadsheet);
 
 void ED_spreadsheet_set_geometry_node_context(struct SpaceSpreadsheet *sspreadsheet,
                                               struct SpaceNode *snode,
diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index df65c602fc4..7553a2d373e 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -386,6 +386,7 @@ typedef enum {
   /** Resize handle (resize uilist). */
   UI_BTYPE_GRIP = 57 << 9,
   UI_BTYPE_DECORATOR = 58 << 9,
+  UI_BTYPE_DATASETROW = 59 << 9,
 } eButType;
 
 #define BUTTYPE (63 << 9)
@@ -516,7 +517,7 @@ typedef struct ARegion *(*uiButSearchTooltipFn)(struct bContext *C,
 
 /* Must return allocated string. */
 typedef char *(*uiButToolTipFunc)(struct bContext *C, void *argN, const char *tip);
-typedef int (*uiButPushedStateFunc)(struct bContext *C, void *arg);
+typedef int (*uiButPushedStateFunc)(struct uiBut *but, const void *arg);
 
 typedef void (*uiBlockHandleFunc)(struct bContext *C, void *arg, int event);
 
@@ -1612,6 +1613,13 @@ int UI_searchbox_size_x(void);
 /* check if a string is in an existing search box */
 int UI_search_items_find_index(uiSearchItems *items, const char *name);
 
+void UI_but_hint_drawstr_set(uiBut *but, const char *string);
+void UI_but_datasetrow_indentation_set(uiBut *but, int indentation);
+void UI_but_datasetrow_component_set(uiBut *but, uint8_t geometry_component_type);
+void UI_but_datasetrow_domain_set(uiBut *but, uint8_t attribute_domain);
+uint8_t UI_but_datasetrow_component_get(uiBut *but);
+uint8_t UI_but_datasetrow_domain_get(uiBut *but);
+
 void UI_but_node_link_set(uiBut *but, struct bNodeSocket *socket, const float draw_color[4]);
 
 void UI_but_number_step_size_set(uiBut *but, float step_size);
@@ -1650,7 +1658,7 @@ void UI_but_focus_on_enter_event(struct wmWindow *win, uiBut *but);
 
 void UI_but_func_hold_set(uiBut *but, uiButHandleHoldFunc func, void *argN);
 
-void UI_but_func_pushed_state_set(uiBut *but, uiButPushedStateFunc func, void *arg);
+void UI_but_func_pushed_state_set(uiBut *but, uiButPushedStateFunc func, const void *arg);
 
 struct PointerRNA *UI_but_extra_operator_icon_add(uiBut *but,
                                                   const char *opname,