Collection Editor based on patch by Julian Eisel

This is extracted from the layer-manager branch. With the following
changes:

* Renamed references of layer manager to collections manager
* I didn't include the editors/space_collections/ draw and util files.

I still need to bring the drawing code here, so we see something.

29 files changed, 444 insertions, 5 deletions

diff --git a/source/blender/blenkernel/BKE_context.h b/source/blender/blenkernel/BKE_context.h
index 649d142d1cd..3f131050694 100644
--- a/source/blender/blenkernel/BKE_context.h
+++ b/source/blender/blenkernel/BKE_context.h
@@ -169,6 +169,7 @@ struct SpaceAction *CTX_wm_space_action(const bContext *C);
 struct SpaceInfo *CTX_wm_space_info(const bContext *C);
 struct SpaceUserPref *CTX_wm_space_userpref(const bContext *C);
 struct SpaceClip *CTX_wm_space_clip(const bContext *C);
+struct SpaceCollections *CTX_wm_space_collections(const bContext *C);
 
 void CTX_wm_manager_set(bContext *C, struct wmWindowManager *wm);
 void CTX_wm_window_set(bContext *C, struct wmWindow *win);
diff --git a/source/blender/blenkernel/intern/context.c b/source/blender/blenkernel/intern/context.c
index 8025732efe5..85fa57f788b 100644
--- a/source/blender/blenkernel/intern/context.c
+++ b/source/blender/blenkernel/intern/context.c
@@ -815,6 +815,14 @@ struct SpaceClip *CTX_wm_space_clip(const bContext *C)
 	return NULL;
 }
 
+struct SpaceCollections *CTX_wm_space_collections(const bContext *C)
+{
+	ScrArea *sa = CTX_wm_area(C);
+	if (sa && sa->spacetype == SPACE_COLLECTIONS)
+		return sa->spacedata.first;
+	return NULL;
+}
+
 void CTX_wm_manager_set(bContext *C, wmWindowManager *wm)
 {
 	C->wm.manager = wm;
diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index cec886b4ce3..90f7ddc5f6d 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -103,6 +103,8 @@
 #include "DNA_movieclip_types.h"
 #include "DNA_mask_types.h"
 
+#include "RNA_access.h"
+
 #include "MEM_guardedalloc.h"
 
 #include "BLI_endian_switch.h"
@@ -6552,6 +6554,10 @@ static void lib_link_screen(FileData *fd, Main *main)
 						
 						slogic->gpd = newlibadr_us(fd, sc->id.lib, slogic->gpd);
 					}
+					else if (sl->spacetype == SPACE_COLLECTIONS) {
+						SpaceCollections *slayer = (SpaceCollections *)sl;
+						slayer->flag |= SC_COLLECTION_DATA_REFRESH;
+					}
 				}
 			}
 			sc->id.tag &= ~LIB_TAG_NEED_LINK;
@@ -6937,6 +6943,10 @@ void blo_lib_link_screen_restore(Main *newmain, bScreen *curscreen, Scene *cursc
 					
 					slogic->gpd = restore_pointer_by_name(id_map, (ID *)slogic->gpd, USER_REAL);
 				}
+				else if (sl->spacetype == SPACE_COLLECTIONS) {
+					SpaceCollections *slayer = (SpaceCollections *)sl;
+					slayer->flag |= SC_COLLECTION_DATA_REFRESH;
+				}
 			}
 		}
 	}
@@ -7331,6 +7341,10 @@ static bool direct_link_screen(FileData *fd, bScreen *sc)
 				sclip->scopes.track_preview = NULL;
 				sclip->scopes.ok = 0;
 			}
+			else if (sl->spacetype == SPACE_COLLECTIONS) {
+				SpaceCollections *slayer = (SpaceCollections *)sl;
+				slayer->flag |= SC_COLLECTION_DATA_REFRESH;
+			}
 		}
 		
 		BLI_listbase_clear(&sa->actionzones);
diff --git a/source/blender/blenloader/intern/writefile.c b/source/blender/blenloader/intern/writefile.c
index 1621bb78432..c22acf2f758 100644
--- a/source/blender/blenloader/intern/writefile.c
+++ b/source/blender/blenloader/intern/writefile.c
@@ -3200,6 +3200,9 @@ static void write_screens(WriteData *wd, ListBase *scrbase)
 				else if (sl->spacetype == SPACE_INFO) {
 					writestruct(wd, DATA, SpaceInfo, 1, sl);
 				}
+				else if (sl->spacetype == SPACE_COLLECTIONS) {
+					writestruct(wd, DATA, SpaceCollections, 1, sl);
+				}
 
 				sl = sl->next;
 			}
diff --git a/source/blender/editors/CMakeLists.txt b/source/blender/editors/CMakeLists.txt
index 1559512d713..7e804a5bbfc 100644
--- a/source/blender/editors/CMakeLists.txt
+++ b/source/blender/editors/CMakeLists.txt
@@ -47,6 +47,7 @@ if(WITH_BLENDER)
 	add_subdirectory(space_graph)
 	add_subdirectory(space_image)
 	add_subdirectory(space_info)
+	add_subdirectory(space_collections)
 	add_subdirectory(space_logic)
 	add_subdirectory(space_nla)
 	add_subdirectory(space_node)
diff --git a/source/blender/editors/include/BIF_glutil.h b/source/blender/editors/include/BIF_glutil.h
index 35d38bf4ca1..96532f748e4 100644
--- a/source/blender/editors/include/BIF_glutil.h
+++ b/source/blender/editors/include/BIF_glutil.h
@@ -49,6 +49,7 @@ struct ColorManagedDisplaySettings;
 
 void fdrawline(float x1, float y1, float x2, float y2); /* DEPRECATED */
 void fdrawbox(float x1, float y1, float x2, float y2); /* DEPRECATED */
+void fdrawbox_filled(float x1, float y1, float x2, float y2);
 void sdrawline(int x1, int y1, int x2, int y2); /* DEPRECATED */
 void sdrawbox(int x1, int y1, int x2, int y2); /* DEPRECATED */
 
diff --git a/source/blender/editors/include/ED_object.h b/source/blender/editors/include/ED_object.h
index 40112bc20fc..c1c0463ee5a 100644
--- a/source/blender/editors/include/ED_object.h
+++ b/source/blender/editors/include/ED_object.h
@@ -55,6 +55,7 @@ struct wmOperatorType;
 struct PointerRNA;
 struct PropertyRNA;
 struct EnumPropertyItem;
+struct LayerTree;
 
 /* object_edit.c */
 struct Object *ED_object_context(struct bContext *C);               /* context.object */
diff --git a/source/blender/editors/include/ED_screen.h b/source/blender/editors/include/ED_screen.h
index f5f66a07aea..01be63919be 100644
--- a/source/blender/editors/include/ED_screen.h
+++ b/source/blender/editors/include/ED_screen.h
@@ -162,6 +162,7 @@ int     ED_operator_image_active(struct bContext *C);
 int     ED_operator_nla_active(struct bContext *C);
 int     ED_operator_logic_active(struct bContext *C);
 int     ED_operator_info_active(struct bContext *C);
+int     ED_operator_collections_active(struct bContext *C);
 int     ED_operator_console_active(struct bContext *C);
 
 
diff --git a/source/blender/editors/include/ED_space_api.h b/source/blender/editors/include/ED_space_api.h
index d268c578cf2..b754e1ba20f 100644
--- a/source/blender/editors/include/ED_space_api.h
+++ b/source/blender/editors/include/ED_space_api.h
@@ -58,6 +58,7 @@ void ED_spacetype_logic(void);
 void ED_spacetype_console(void);
 void ED_spacetype_userpref(void);
 void ED_spacetype_clip(void);
+void ED_spacetype_collections(void);
 
 /* calls for instancing and freeing spacetype static data 
  * called in WM_init_exit */
diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index d48cfbee413..55f11b94eb2 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -212,6 +212,9 @@ enum {
 	UI_BUT_ALIGN_STITCH_TOP  = (1 << 18),
 	UI_BUT_ALIGN_STITCH_LEFT = (1 << 19),
 	UI_BUT_ALIGN_ALL         = (UI_BUT_ALIGN | UI_BUT_ALIGN_STITCH_TOP | UI_BUT_ALIGN_STITCH_LEFT),
+
+	/* Another hack, in some rare cases we don't want any text margin */
+	UI_BUT_TEXT_NO_MARGIN    = (1 << 20),
 };
 
 /* scale fixed button widths by this to account for DPI */
diff --git a/source/blender/editors/include/UI_interface_icons.h b/source/blender/editors/include/UI_interface_icons.h
index 945ac1b6db9..f08c46af8a6 100644
--- a/source/blender/editors/include/UI_interface_icons.h
+++ b/source/blender/editors/include/UI_interface_icons.h
@@ -83,5 +83,6 @@ struct PreviewImage *UI_icon_to_preview(int icon_id);
 
 int UI_rnaptr_icon_get(struct bContext *C, struct PointerRNA *ptr, int rnaicon, const bool big);
 int UI_idcode_icon_get(const int idcode);
+int UI_colorset_icon_get(const int set_idx);
 
 #endif /*  __UI_INTERFACE_ICONS_H__ */
diff --git a/source/blender/editors/interface/interface_icons.c b/source/blender/editors/interface/interface_icons.c
index 0573e8d9c94..70bfd30c2d8 100644
--- a/source/blender/editors/interface/interface_icons.c
+++ b/source/blender/editors/interface/interface_icons.c
@@ -1385,6 +1385,14 @@ int UI_idcode_icon_get(const int idcode)
 	}
 }
 
+/**
+ * \param set_idx: A value from #rna_enum_color_sets_items.
+ */
+int UI_colorset_icon_get(const int set_idx)
+{
+	return (set_idx < 1) ? ICON_NONE : VICO_COLORSET_01_VEC - 1 + set_idx;
+}
+
 static void icon_draw_at_size(
         float x, float y, int icon_id, float aspect, float alpha,
         enum eIconSizes size, const bool nocreate)
diff --git a/source/blender/editors/interface/interface_widgets.c b/source/blender/editors/interface/interface_widgets.c
index b75ecf68136..9dd6c670da8 100644
--- a/source/blender/editors/interface/interface_widgets.c
+++ b/source/blender/editors/interface/interface_widgets.c
@@ -1575,7 +1575,10 @@ static void widget_draw_text_icon(uiFontStyle *fstyle, uiWidgetColors *wcol, uiB
 		}
 	}
 
-	if (but->editstr || (but->drawflag & UI_BUT_TEXT_LEFT)) {
+	if (but->drawflag & UI_BUT_TEXT_NO_MARGIN) {
+		/* skip */
+	}
+	else if (but->editstr || (but->drawflag & UI_BUT_TEXT_LEFT)) {
 		rect->xmin += (UI_TEXT_MARGIN_X * U.widget_unit) / but->block->aspect;
 	}
 	else if ((but->drawflag & UI_BUT_TEXT_RIGHT)) {
diff --git a/source/blender/editors/interface/resources.c b/source/blender/editors/interface/resources.c
index 999556025db..ea72a4aa25b 100644
--- a/source/blender/editors/interface/resources.c
+++ b/source/blender/editors/interface/resources.c
@@ -165,6 +165,9 @@ const unsigned char *UI_ThemeGetColorPtr(bTheme *btheme, int spacetype, int colo
 				case SPACE_CLIP:
 					ts = &btheme->tclip;
 					break;
+				case SPACE_COLLECTIONS:
+					ts = &btheme->tcollections;
+					break;
 				default:
 					ts = &btheme->tv3d;
 					break;
@@ -1206,6 +1209,11 @@ void ui_theme_init_default(void)
 	rgba_char_args_set(btheme->tclip.strip_select, 0xff, 0x8c, 0x00, 0xff);
 	btheme->tclip.handle_vertex_size = 5;
 	ui_theme_space_init_handles_color(&btheme->tclip);
+
+	/* space collection manager */
+	btheme->tcollections = btheme->tv3d;
+	rgba_char_args_set_fl(btheme->tcollections.back,    0.42, 0.42, 0.42, 1.0);
+	rgba_char_args_set(btheme->tcollections.hilite, 255, 140, 25, 255);  /* selected files */
 }
 
 void ui_style_init_default(void)
@@ -2834,7 +2842,11 @@ void init_userdef_do_versions(void)
 	 * (keep this block even if it becomes empty).
 	 */
 	{
-		
+		for (bTheme *btheme = U.themes.first; btheme; btheme = btheme->next) {
+			btheme->tcollections = btheme->tv3d;
+			rgba_char_args_set_fl(btheme->tcollections.back,    0.42, 0.42, 0.42, 1.0);
+			rgba_char_args_set(btheme->tcollections.hilite, 255, 140, 25, 255);  /* selected files */
+		}
 	}
 
 	if (U.pixelsize == 0.0f)
diff --git a/source/blender/editors/screen/glutil.c b/source/blender/editors/screen/glutil.c
index ef514dd5e84..f2933cfa935 100644
--- a/source/blender/editors/screen/glutil.c
+++ b/source/blender/editors/screen/glutil.c
@@ -75,6 +75,18 @@ void fdrawbox(float x1, float y1, float x2, float y2)
 	glEnd();
 }
 
+void fdrawbox_filled(float x1, float y1, float x2, float y2)
+{
+	glBegin(GL_POLYGON);
+
+	glVertex2f(x1, y1);
+	glVertex2f(x1, y2);
+	glVertex2f(x2, y2);
+	glVertex2f(x2, y1);
+
+	glEnd();
+}
+
 void fdrawcheckerboard(float x1, float y1, float x2, float y2) /* DEPRECATED */
 {
 	unsigned char col1[4] = {40, 40, 40}, col2[4] = {50, 50, 50};
diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index 32b63aca34c..a55d6c2143f 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -321,6 +321,10 @@ int ED_operator_info_active(bContext *C)
 	return ed_spacetype_test(C, SPACE_INFO);
 }
 
+int ED_operator_collections_active(bContext *C)
+{
+	return ed_spacetype_test(C, SPACE_COLLECTIONS);
+}
 
 int ED_operator_console_active(bContext *C)
 {
diff --git a/source/blender/editors/space_api/spacetypes.c b/source/blender/editors/space_api/spacetypes.c
index 5ff1d758563..8c278c0b3ae 100644
--- a/source/blender/editors/space_api/spacetypes.c
+++ b/source/blender/editors/space_api/spacetypes.c
@@ -96,6 +96,7 @@ void ED_spacetypes_init(void)
 	ED_spacetype_console();
 	ED_spacetype_userpref();
 	ED_spacetype_clip();
+	ED_spacetype_collections();
 //	...
 	
 	/* register operator types for screen and all spaces */
diff --git a/source/blender/editors/space_collections/CMakeLists.txt b/source/blender/editors/space_collections/CMakeLists.txt
new file mode 100644
index 00000000000..1cc4a40d657
--- /dev/null
+++ b/source/blender/editors/space_collections/CMakeLists.txt
@@ -0,0 +1,45 @@
+# ***** BEGIN GPL LICENSE BLOCK *****
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# Contributor(s): Jacques Beaurain.
+#
+# ***** END GPL LICENSE BLOCK *****
+
+set(INC
+	../include
+	../../blenkernel
+	../../blenlib
+	../../blentranslation
+	../../gpu
+	../../makesdna
+	../../makesrna
+	../../windowmanager
+	../../../../intern/guardedalloc
+	../../../../intern/glew-mx
+)
+
+set(INC_SYS
+	${GLEW_INCLUDE_PATH}
+)
+
+set(SRC
+	collections_ops.c
+	space_collections.c
+
+	collections_intern.h
+)
+
+blender_add_lib(bf_editor_space_collections "${SRC}" "${INC}" "${INC_SYS}")
diff --git a/source/blender/editors/space_collections/collections_intern.h b/source/blender/editors/space_collections/collections_intern.h
new file mode 100644
index 00000000000..866f59659c3
--- /dev/null
+++ b/source/blender/editors/space_collections/collections_intern.h
@@ -0,0 +1,35 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/editors/space_collections/collections_intern.h
+ *  \ingroup spcollections
+ */
+
+#ifndef __COLLECTIONS_INTERN_H__
+#define __COLLECTIONS_INTERN_H__
+
+struct wmKeyConfig;
+
+/* collections_ops.c */
+void collections_operatortypes(void);
+void collections_keymap(struct wmKeyConfig *keyconf);
+
+#endif  /* __COLLECTIONS_INTERN_H__ */
+
diff --git a/source/blender/editors/space_collections/collections_ops.c b/source/blender/editors/space_collections/collections_ops.c
new file mode 100644
index 00000000000..c822ac1e824
--- /dev/null
+++ b/source/blender/editors/space_collections/collections_ops.c
@@ -0,0 +1,37 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/editors/space_collections/collections_ops.c
+ *  \ingroup spcollections
+ */
+
+#include "WM_api.h"
+#include "collections_intern.h" /* own include */
+
+
+/* ************************** registration - operator types **********************************/
+
+void collections_operatortypes(void)
+{
+}
+
+void collections_keymap(wmKeyConfig *UNUSED(keyconf))
+{
+}
diff --git a/source/blender/editors/space_collections/space_collections.c b/source/blender/editors/space_collections/space_collections.c
new file mode 100644
index 00000000000..7dd50e5cbac
--- /dev/null
+++ b/source/blender/editors/space_collections/space_collections.c
@@ -0,0 +1,182 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/editors/space_collections/space_collections.c
+ *  \ingroup spcollections
+ */
+
+#include <string.h>
+
+#include "MEM_guardedalloc.h"
+
+#include "BIF_gl.h"
+
+#include "BKE_context.h"
+#include "BKE_screen.h"
+
+#include "BLI_ghash.h"
+#include "BLI_listbase.h"
+
+#include "ED_screen.h"
+#include "ED_space_api.h"
+
+#include "UI_resources.h"
+#include "UI_view2d.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "collections_intern.h" /* own include */
+
+/* ******************** default callbacks for collection manager space ***************** */
+
+static SpaceLink *collections_new(const bContext *UNUSED(C))
+{
+	ARegion *ar;
+	SpaceCollections *scollection; /* hmm, that's actually a good band name... */
+
+	scollection = MEM_callocN(sizeof(SpaceCollections), __func__);
+	scollection->spacetype = SPACE_COLLECTIONS;
+
+	/* header */
+	ar = MEM_callocN(sizeof(ARegion), "header for collection manager");
+	BLI_addtail(&scollection->regionbase, ar);
+	ar->regiontype = RGN_TYPE_HEADER;
+	ar->alignment = RGN_ALIGN_BOTTOM;
+
+	/* main region */
+	ar = MEM_callocN(sizeof(ARegion), "main region for collection manager");
+	BLI_addtail(&scollection->regionbase, ar);
+	ar->regiontype = RGN_TYPE_WINDOW;
+	ar->v2d.scroll = (V2D_SCROLL_RIGHT | V2D_SCROLL_BOTTOM | V2D_SCROLL_HORIZONTAL_HIDE | V2D_SCROLL_VERTICAL_HIDE);
+	ar->v2d.align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_POS_Y);
+
+	return (SpaceLink *)scollection;
+}
+
+static void collections_free(SpaceLink *UNUSED(sl))
+{
+}
+
+static SpaceLink *collections_duplicate(SpaceLink *sl)
+{
+	SpaceCollections *scollection = MEM_dupallocN(sl);
+
+	/* clear or remove stuff from old */
+
+	return (SpaceLink *)scollection;
+}
+
+/* add handlers, stuff you only do once or on area/region changes */
+static void collection_main_region_init(wmWindowManager *wm, ARegion *ar)
+{
+	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_LIST, ar->winx, ar->winy);
+	ar->v2d.scroll |= (V2D_SCROLL_VERTICAL_FULLR | V2D_SCROLL_HORIZONTAL_FULLR);
+
+	/* own keymap */
+	wmKeyMap *keymap = WM_keymap_find(wm->defaultconf, "Layer Manager", SPACE_COLLECTIONS, 0);
+	WM_event_add_keymap_handler_bb(&ar->handlers, keymap, &ar->v2d.mask, &ar->winrct);
+}
+
+static void collections_main_region_draw(const bContext *C, ARegion *ar)
+{
+	SpaceCollections *spc = CTX_wm_space_collections(C);
+	View2D *v2d = &ar->v2d;
+
+	if (spc->flag & SC_COLLECTION_DATA_REFRESH) {
+	}
+
+	/* v2d has initialized flag, so this call will only set the mask correct */
+	UI_view2d_region_reinit(v2d, V2D_COMMONVIEW_LIST, ar->winx, ar->winy);
+
+	UI_ThemeClearColor(TH_BACK);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	/* reset view matrix */
+	UI_view2d_view_restore(C);
+
+	/* scrollers */
+	View2DScrollers *scrollers;
+	scrollers = UI_view2d_scrollers_calc(C, v2d, V2D_ARG_DUMMY, V2D_ARG_DUMMY, V2D_ARG_DUMMY, V2D_ARG_DUMMY);
+	UI_view2d_scrollers_draw(C, v2d, scrollers);
+	UI_view2d_scrollers_free(scrollers);
+}
+
+/* add handlers, stuff you only do once or on area/region changes */
+static void collections_header_region_init(wmWindowManager *UNUSED(wm), ARegion *ar)
+{
+	ED_region_header_init(ar);
+}
+
+static void collections_header_region_draw(const bContext *C, ARegion *ar)
+{
+	ED_region_header(C, ar);
+}
+
+static void collections_main_region_listener(bScreen *UNUSED(sc), ScrArea *UNUSED(sa), ARegion *ar, wmNotifier *wmn)
+{
+	switch (wmn->category) {
+		case NC_SCENE:
+			if (wmn->data == ND_LAYER) {
+				ED_region_tag_redraw(ar);
+			}
+			break;
+		case NC_SPACE:
+			if (wmn->data == ND_SPACE_COLLECTIONS) {
+				ED_region_tag_redraw(ar);
+			}
+	}
+}
+
+/* only called once, from space/spacetypes.c */
+void ED_spacetype_collections(void)
+{
+	SpaceType *st = MEM_callocN(sizeof(SpaceType), "spacetype collections");
+	ARegionType *art;
+
+	st->spaceid = SPACE_COLLECTIONS;
+	strncpy(st->name, "LayerManager", BKE_ST_MAXNAME);
+
+	st->new = collections_new;
+	st->free = collections_free;
+	st->duplicate = collections_duplicate;
+	st->operatortypes = collections_operatortypes;
+	st->keymap = collections_keymap;
+
+	/* regions: main window */
+	art = MEM_callocN(sizeof(ARegionType), "spacetype collections region");
+	art->regionid = RGN_TYPE_WINDOW;
+	art->init = collection_main_region_init;
+	art->draw = collections_main_region_draw;
+	art->listener = collections_main_region_listener;
+	art->keymapflag = ED_KEYMAP_UI | ED_KEYMAP_VIEW2D;
+	BLI_addhead(&st->regiontypes, art);
+
+	/* regions: header */
+	art = MEM_callocN(sizeof(ARegionType), "spacetype collections header");
+	art->regionid = RGN_TYPE_HEADER;
+	art->prefsizey = HEADERY;
+	art->keymapflag = ED_KEYMAP_UI | ED_KEYMAP_VIEW2D | ED_KEYMAP_HEADER;
+	art->init = collections_header_region_init;
+	art->draw = collections_header_region_draw;
+	BLI_addhead(&st->regiontypes, art);
+
+	BKE_spacetype_register(st);
+}
diff --git a/source/blender/makesdna/DNA_space_types.h b/source/blender/makesdna/DNA_space_types.h
index 5e015544dc9..00d4f6444dd 100644
--- a/source/blender/makesdna/DNA_space_types.h
+++ b/source/blender/makesdna/DNA_space_types.h
@@ -1343,6 +1343,20 @@ typedef enum eSpaceClip_GPencil_Source {
 	SC_GPENCIL_SRC_TRACK = 1,
 } eSpaceClip_GPencil_Source;
 
+/* Collection Manager ======================================= */
+
+typedef struct SpaceCollections {
+	SpaceLink *next, *prev;
+	ListBase regionbase;        /* storage of regions for inactive spaces */
+	int spacetype;
+	int flag; /* eSpaceCollections_Flag */
+} SpaceCollections;
+
+/* SpaceClip->flag */
+typedef enum eSpaceCollections_Flag {
+	SC_COLLECTION_DATA_REFRESH = (1 << 0), /* recreate/update SpaceCollections layer data, needed for undo/read/write */
+} eSpaceCollections_Flag;
+
 /* **************** SPACE DEFINES ********************* */
 
 /* space types, moved from DNA_screen_types.h */
@@ -1372,8 +1386,9 @@ typedef enum eSpace_Type {
 	SPACE_CONSOLE  = 18,
 	SPACE_USERPREF = 19,
 	SPACE_CLIP     = 20,
-	
-	SPACEICONMAX = SPACE_CLIP
+	SPACE_COLLECTIONS   = 21,
+
+	SPACEICONMAX = SPACE_COLLECTIONS
 } eSpace_Type;
 
 /* use for function args */
diff --git a/source/blender/makesdna/DNA_userdef_types.h b/source/blender/makesdna/DNA_userdef_types.h
index 1dc6c7ab578..6cc24f74cee 100644
--- a/source/blender/makesdna/DNA_userdef_types.h
+++ b/source/blender/makesdna/DNA_userdef_types.h
@@ -390,7 +390,8 @@ typedef struct bTheme {
 	ThemeSpace tuserpref;
 	ThemeSpace tconsole;
 	ThemeSpace tclip;
-	
+	ThemeSpace tcollections;
+
 	/* 20 sets of bone colors for this theme */
 	ThemeWireColor tarm[20];
 	/*ThemeWireColor tobj[20];*/
diff --git a/source/blender/makesrna/RNA_access.h b/source/blender/makesrna/RNA_access.h
index 448e5901ec8..48e20e72528 100644
--- a/source/blender/makesrna/RNA_access.h
+++ b/source/blender/makesrna/RNA_access.h
@@ -574,6 +574,7 @@ extern StructRNA RNA_SpaceFileBrowser;
 extern StructRNA RNA_SpaceGraphEditor;
 extern StructRNA RNA_SpaceImageEditor;
 extern StructRNA RNA_SpaceInfo;
+extern StructRNA RNA_SpaceCollectionManager;
 extern StructRNA RNA_SpaceLogicEditor;
 extern StructRNA RNA_SpaceNLA;
 extern StructRNA RNA_SpaceNodeEditor;
@@ -642,6 +643,7 @@ extern StructRNA RNA_ThemeFontStyle;
 extern StructRNA RNA_ThemeGraphEditor;
 extern StructRNA RNA_ThemeImageEditor;
 extern StructRNA RNA_ThemeInfo;
+extern StructRNA RNA_ThemeCollectionManager;
 extern StructRNA RNA_ThemeLogicEditor;
 extern StructRNA RNA_ThemeNLAEditor;
 extern StructRNA RNA_ThemeNodeEditor;
diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index af4fb9d0d8a..14b8410e738 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -79,6 +79,7 @@ EnumPropertyItem rna_enum_space_type_items[] = {
 	{0, "", ICON_NONE, NULL, NULL},
 	{SPACE_BUTS, "PROPERTIES", ICON_BUTS, "Properties", "Edit properties of active object and related data-blocks"},
 	{SPACE_OUTLINER, "OUTLINER", ICON_OOPS, "Outliner", "Overview of scene graph and all available data-blocks"},
+	{SPACE_COLLECTIONS, "COLLECTION_MANAGER", ICON_COLLAPSEMENU, "Collections", "Edit collections of active render layer"},
 	{SPACE_USERPREF, "USER_PREFERENCES", ICON_PREFERENCES, "User Preferences", "Edit persistent configuration settings"},
 	{SPACE_INFO, "INFO", ICON_INFO, "Info", "Main menu bar and list of error messages (drag down to expand and display)"},
 	{0, "", ICON_NONE, NULL, NULL},
@@ -315,6 +316,8 @@ static StructRNA *rna_Space_refine(struct PointerRNA *ptr)
 			return &RNA_SpaceUserPreferences;
 		case SPACE_CLIP:
 			return &RNA_SpaceClipEditor;
+		case SPACE_COLLECTIONS:
+			return &RNA_SpaceCollectionManager;
 		default:
 			return &RNA_Space;
 	}
@@ -4812,6 +4815,15 @@ static void rna_def_space_clip(BlenderRNA *brna)
 	RNA_def_property_update(prop, NC_SPACE | ND_SPACE_CLIP, NULL);
 }
 
+static void rna_def_space_collections(BlenderRNA *brna)
+{
+	StructRNA *srna;
+
+	srna = RNA_def_struct(brna, "SpaceCollectionManager", "Space");
+	RNA_def_struct_sdna(srna, "SpaceCollections");
+	RNA_def_struct_ui_text(srna, "Space Collection Manager", "Layer Collection space data");
+}
+
 
 void RNA_def_space(BlenderRNA *brna)
 {
@@ -4838,6 +4850,7 @@ void RNA_def_space(BlenderRNA *brna)
 	rna_def_space_node(brna);
 	rna_def_space_logic(brna);
 	rna_def_space_clip(brna);
+	rna_def_space_collections(brna);
 }
 
 #endif
diff --git a/source/blender/makesrna/intern/rna_userdef.c b/source/blender/makesrna/intern/rna_userdef.c
index 0eab38faca8..dbf6e636c65 100644
--- a/source/blender/makesrna/intern/rna_userdef.c
+++ b/source/blender/makesrna/intern/rna_userdef.c
@@ -2956,6 +2956,26 @@ static void rna_def_userdef_theme_space_clip(BlenderRNA *brna)
 	rna_def_userdef_theme_spaces_curves(srna, false, false, false, true);
 }
 
+static void rna_def_userdef_theme_space_collections(BlenderRNA *brna)
+{
+	StructRNA *srna;
+	PropertyRNA *prop;
+
+	srna = RNA_def_struct(brna, "ThemeCollectionManager", NULL);
+	RNA_def_struct_sdna(srna, "ThemeSpace");
+	RNA_def_struct_clear_flag(srna, STRUCT_UNDO);
+	RNA_def_struct_ui_text(srna, "Theme Collection Manager", "Theme settings for the Collection Manager");
+
+	rna_def_userdef_theme_spaces_main(srna);
+	rna_def_userdef_theme_spaces_list_main(srna);
+
+	prop = RNA_def_property(srna, "selected_collection", PROP_FLOAT, PROP_COLOR_GAMMA);
+	RNA_def_property_float_sdna(prop, NULL, "hilite");
+	RNA_def_property_array(prop, 3);
+	RNA_def_property_ui_text(prop, "Selected Collection", "");
+	RNA_def_property_update(prop, 0, "rna_userdef_update");
+}
+
 static void rna_def_userdef_themes(BlenderRNA *brna)
 {
 	StructRNA *srna;
@@ -2982,6 +3002,7 @@ static void rna_def_userdef_themes(BlenderRNA *brna)
 		{16, "FILE_BROWSER", ICON_FILESEL, "File Browser", ""},
 		{17, "CONSOLE", ICON_CONSOLE, "Python Console", ""},
 		{20, "CLIP_EDITOR", ICON_CLIP, "Movie Clip Editor", ""},
+		{21, "COLLECTION_MANAGER", ICON_COLLAPSEMENU, "Collection Manager", ""},
 		{0, NULL, 0, NULL, NULL}
 	};
 
@@ -3115,6 +3136,12 @@ static void rna_def_userdef_themes(BlenderRNA *brna)
 	RNA_def_property_pointer_sdna(prop, NULL, "tclip");
 	RNA_def_property_struct_type(prop, "ThemeClipEditor");
 	RNA_def_property_ui_text(prop, "Clip Editor", "");
+
+	prop = RNA_def_property(srna, "collection_manager", PROP_POINTER, PROP_NONE);
+	RNA_def_property_flag(prop, PROP_NEVER_NULL);
+	RNA_def_property_pointer_sdna(prop, NULL, "tcollections");
+	RNA_def_property_struct_type(prop, "ThemeCollectionManager");
+	RNA_def_property_ui_text(prop, "Collection Manager", "");
 }
 
 static void rna_def_userdef_addon(BlenderRNA *brna)
@@ -3205,6 +3232,7 @@ static void rna_def_userdef_dothemes(BlenderRNA *brna)
 	rna_def_userdef_theme_space_console(brna);
 	rna_def_userdef_theme_space_logic(brna);
 	rna_def_userdef_theme_space_clip(brna);
+	rna_def_userdef_theme_space_collections(brna);
 	rna_def_userdef_theme_colorset(brna);
 	rna_def_userdef_themes(brna);
 }
diff --git a/source/blender/python/intern/bpy_rna_callback.c b/source/blender/python/intern/bpy_rna_callback.c
index df1c4155a6d..b8c9b3ff9e9 100644
--- a/source/blender/python/intern/bpy_rna_callback.c
+++ b/source/blender/python/intern/bpy_rna_callback.c
@@ -174,6 +174,7 @@ static eSpace_Type rna_Space_refine_reverse(StructRNA *srna)
 	if (srna == &RNA_SpaceConsole)          return SPACE_CONSOLE;
 	if (srna == &RNA_SpaceUserPreferences)  return SPACE_USERPREF;
 	if (srna == &RNA_SpaceClipEditor)       return SPACE_CLIP;
+	if (srna == &RNA_SpaceCollectionManager)     return SPACE_COLLECTIONS;
 	return SPACE_EMPTY;
 }
 
diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index 3bed4dac2cf..49e70b4f200 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -364,6 +364,7 @@ typedef struct wmNotifier {
 #define ND_SPACE_CHANGED		(18<<16) /*sent to a new editor type after it's replaced an old one*/
 #define ND_SPACE_CLIP			(19<<16)
 #define ND_SPACE_FILE_PREVIEW   (20<<16)
+#define ND_SPACE_COLLECTIONS         (21<<16)
 
 /* subtype, 256 entries too */
 #define NOTE_SUBTYPE		0x0000FF00
diff --git a/source/blender/windowmanager/intern/wm_keymap.c b/source/blender/windowmanager/intern/wm_keymap.c
index e201fa433d4..4179ac7f993 100644
--- a/source/blender/windowmanager/intern/wm_keymap.c
+++ b/source/blender/windowmanager/intern/wm_keymap.c
@@ -1861,6 +1861,10 @@ wmKeyMap *WM_keymap_guess_opname(const bContext *C, const char *opname)
 	else if (STRPREFIX(opname, "OUTLINER_OT")) {
 		km = WM_keymap_find_all(C, "Outliner", sl->spacetype, 0);
 	}
+	/* Layer Manager */
+	else if (STRPREFIX(opname, "COLLECTIONS_OT")) {
+		km = WM_keymap_find_all(C, "Collection Manager", sl->spacetype, 0);
+	}
 	/* Transform */
 	else if (STRPREFIX(opname, "TRANSFORM_OT")) {
 		/* check for relevant editor */