UI: Tabs categories for panels (D75)

- works by defining panel categories, currently restricted to the toolbar.
- no panels define bl_categories yet, so no user visible changes since tabs only show when there are multiple.
- panel pinning is available in rmb menu or alt+lmb.

1 files changed, 42 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_screen_types.h b/source/blender/makesdna/DNA_screen_types.h
index 6b90557113a..005b0bda041 100644
--- a/source/blender/makesdna/DNA_screen_types.h
+++ b/source/blender/makesdna/DNA_screen_types.h
@@ -112,6 +112,36 @@ typedef struct Panel {		/* the part from uiBlock that needs saved in file */
 	void *activedata;			/* runtime for panel manipulation */
 } Panel;
 
+
+/* Notes on Panel Catogories:
+ *
+ * ar->panels_category (PanelCategoryDyn) is a runtime only list of categories collected during draw.
+ *
+ * ar->panels_category_active (PanelCategoryStack) is basically a list of strings (category id's).
+ *
+ * Clicking on a tab moves it to the front of ar->panels_category_active,
+ * If the context changes so this tab is no longer displayed,
+ * then the first-most tab in ar->panels_category_active is used.
+ *
+ * This way you can change modes and always have the tab you last clicked on.
+ */
+
+/* region level tabs */
+#
+#
+typedef struct PanelCategoryDyn {
+	struct PanelCategoryDyn *next, *prev;
+	char idname[64];
+	rcti rect;
+} PanelCategoryDyn;
+
+/* region stack of active tabs */
+typedef struct PanelCategoryStack {
+	struct PanelCategoryStack *next, *prev;
+	char idname[64];
+} PanelCategoryStack;
+
+
 /* uiList dynamic data... */
 /* These two Lines with # tell makesdna this struct can be excluded. */
 #
@@ -209,8 +239,10 @@ typedef struct ARegion {
 	
 	ListBase uiblocks;			/* uiBlock */
 	ListBase panels;			/* Panel */
+	ListBase panels_category_active;	/* Stack of panel categories */
 	ListBase ui_lists;			/* uiList */
 	ListBase handlers;			/* wmEventHandler */
+	ListBase panels_category;	/* Panel categories runtime */
 	
 	struct wmTimer *regiontimer; /* blend in/out */
 	
@@ -244,6 +276,16 @@ typedef struct ARegion {
 #define SCREENNORMAL	0
 #define SCREENFULL		1
 
+/* Panel->flag */
+enum {
+	PNL_SELECT      = (1 << 0),
+	PNL_CLOSEDX     = (1 << 1),
+	PNL_CLOSEDY     = (1 << 2),
+	PNL_CLOSED      = (PNL_CLOSEDX | PNL_CLOSEDY),
+	/*PNL_TABBED    = (1 << 3), */ /*UNUSED*/
+	PNL_OVERLAP     = (1 << 4),
+	PNL_PIN         = (1 << 5),
+};
 
 /* Panel->snap - for snapping to screen edges */
 #define PNL_SNAP_NONE		0