operators.py

                    laycol["ptr"].hide_viewport = False
                    laycol = laycol["parent"]

                cls.isolated = True

        elif modifiers == {"ctrl"}:
            # toggle children

            # reset hide history
            del rto_history["hide"][view_layer]

            # toggle view of collection
            state = not laycol_ptr.hide_viewport
            laycol_ptr.hide_viewport = state

            # pass state to children
            laycol_iter_list = [laycol_ptr.children]
            while len(laycol_iter_list) > 0:
                new_laycol_iter_list = []
                for laycol_iter in laycol_iter_list:
                    for layer_collection in laycol_iter:
                        layer_collection.hide_viewport = state
                        if len(layer_collection.children) > 0:
                            new_laycol_iter_list.append(layer_collection.children)

                laycol_iter_list = new_laycol_iter_list

            cls.isolated = False

        elif modifiers == {"ctrl", "shift"}:
            # isolate nested collections

            laycol = layer_collections[self.name]

            # check if previous state should be restored
            if cls.isolated and self.name == target:
                # restore previous state
                for x, item in enumerate(layer_collections.values()):
                    item["ptr"].hide_viewport = hide_history[x]

                # reset hide history
                del rto_history["hide"][view_layer]

                cls.isolated = False

            else:
                # isolate nested visibility

                rto_history["hide"][view_layer]["target"] = self.name

                # reset hide history
                hide_history.clear()

                # save state
                for item in layer_collections.values():
                    hide_history.append(item["ptr"].hide_viewport)

                # get child states
                child_states = {}
                laycol_iter_list = [laycol_ptr.children]
                while len(laycol_iter_list) > 0:
                    new_laycol_iter_list = []
                    for laycol_iter in laycol_iter_list:
                        for layer_collection in laycol_iter:
                            child_states[layer_collection.name] = layer_collection.hide_viewport
                            if len(layer_collection.children) > 0:
                                new_laycol_iter_list.append(layer_collection.children)

                    laycol_iter_list = new_laycol_iter_list

                # hide all collections
                for laycol in layer_collections.values():
                    laycol["ptr"].hide_viewport = True

                # show active collection plus parents
                laycol_ptr.hide_viewport = False

                laycol = layer_collections[self.name]
                while laycol["id"] != 0:
                    laycol["ptr"].hide_viewport = False
                    laycol = laycol["parent"]

                # restore child states
                laycol_iter_list = [laycol_ptr.children]
                while len(laycol_iter_list) > 0:
                    new_laycol_iter_list = []
                    for laycol_iter in laycol_iter_list:
                        for layer_collection in laycol_iter:
                            layer_collection.hide_viewport = child_states[layer_collection.name]
                            if len(layer_collection.children) > 0:
                                new_laycol_iter_list.append(layer_collection.children)

                    laycol_iter_list = new_laycol_iter_list

                cls.isolated = True

        else:
            # toggle visible

            # reset hide history
            del rto_history["hide"][view_layer]

            # toggle view of collection
            laycol_ptr.hide_viewport = not laycol_ptr.hide_viewport

            cls.isolated = False

        # reset hide all history
        if view_layer in rto_history["hide_all"]:
            del rto_history["hide_all"][view_layer]

        return {'FINISHED'}


class CMUnHideAllOperator(Operator):
    '''  * Click to toggle between current visibility state and all visible.\n  * Shift-Click to invert visibility status of all collections\n  * Ctrl-Click to Copy/Paste RTOs\n  * Ctrl-Alt-Click to swap RTOs\n  * Alt-Click to discard history and copy/swap actions'''
    bl_label = "Toggle Hidden Status Of All Collections"
    bl_idname = "view3d.un_hide_all_collections"
    bl_options = {'REGISTER', 'UNDO'}

    def invoke(self, context, event):
        global rto_history
        global copy_buffer
        global swap_buffer

        view_layer = context.view_layer.name
        modifiers = get_modifiers(event)

        if not view_layer in rto_history["hide_all"]:
            rto_history["hide_all"][view_layer] = []

        hide_all_history = rto_history["hide_all"][view_layer]

        if modifiers == {"alt"}:
            # clear RTO history
            del rto_history["hide_all"][view_layer]

            # clear copy buffer
            if copy_buffer["RTO"] == "hide_viewport":
                copy_buffer["RTO"] = ""
                copy_buffer["values"].clear()

            # clear swap buffer
            if swap_buffer["A"]["RTO"] == "hide_viewport":
                swap_buffer["A"]["RTO"] = ""
                swap_buffer["A"]["values"].clear()
                swap_buffer["B"]["RTO"] = ""
                swap_buffer["B"]["values"].clear()

            return {'FINISHED'}

        if modifiers == {"ctrl"}:
            if not copy_buffer["values"]:
                # copy
                copy_buffer["RTO"] = "hide_viewport"
                for laycol in layer_collections.values():
                    copy_buffer["values"].append(laycol["ptr"].hide_viewport)

            else:
                # paste
                for x, laycol in enumerate(layer_collections.values()):
                    laycol["ptr"].hide_viewport = copy_buffer["values"][x]

                # clear copy buffer
                copy_buffer["RTO"] = ""
                copy_buffer["values"].clear()

            return {'FINISHED'}

        if modifiers == {"ctrl", "alt"}:
            if not swap_buffer["A"]["values"]:
                # get A
                swap_buffer["A"]["RTO"] = "hide_viewport"
                for laycol in layer_collections.values():
                    swap_buffer["A"]["values"].append(laycol["ptr"].hide_viewport)

            else:
                # get B
                swap_buffer["B"]["RTO"] = "hide_viewport"
                for laycol in layer_collections.values():
                    swap_buffer["B"]["values"].append(laycol["ptr"].hide_viewport)

                # swap A with B
                for x, laycol in enumerate(layer_collections.values()):
                    attr_A = attr_B = laycol["ptr"]

                    # get attributes
                    RTO_A = swap_buffer["A"]["RTO"].split(".")
                    RTO_B = swap_buffer["B"]["RTO"].split(".")

                    if RTO_A[0] == "collection":
                        attr_A = getattr(attr_A, RTO_A[0])

                    if RTO_B[0] == "collection":
                        attr_B = getattr(attr_B, RTO_B[0])


                    # swap values
                    setattr(attr_A, RTO_A[-1], swap_buffer["B"]["values"][x])
                    setattr(attr_B, RTO_B[-1], swap_buffer["A"]["values"][x])

                # clear swap buffer
                swap_buffer["A"]["RTO"] = ""
                swap_buffer["A"]["values"].clear()
                swap_buffer["B"]["RTO"] = ""
                swap_buffer["B"]["values"].clear()

            return {'FINISHED'}

        if len(hide_all_history) == 0:
            hide_all_history.clear()
            keep_history = False

            for item in layer_collections.values():
                if event.shift:
                    keep_history = True
                    hide_all_history.append(item["ptr"].hide_viewport)
                    item["ptr"].hide_viewport = not item["ptr"].hide_viewport

                else:
                    if item["ptr"].hide_viewport:
                        keep_history = True

                    hide_all_history.append(item["ptr"].hide_viewport)
                    item["ptr"].hide_viewport = False

            if not keep_history:
                del rto_history["hide_all"][view_layer]

        else:
            for x, item in enumerate(layer_collections.values()):
                item["ptr"].hide_viewport = hide_all_history[x]

            del rto_history["hide_all"][view_layer]

        return {'FINISHED'}


class CMDisableViewportOperator(Operator):
    '''  * Shift-Click to isolate/restore previous state\n  * Ctrl-Click to toggle children\n  * Shift-Ctrl-Click to toggle nested isolation\n  * Alt-Click to discard history'''
    bl_label = "Disable Collection in Viewport"
    bl_idname = "view3d.disable_viewport_collection"
    bl_options = {'REGISTER', 'UNDO'}

    name: StringProperty()

    # static class var
    isolated = False

    def invoke(self, context, event):
        global rto_history
        cls = CMDisableViewportOperator

        modifiers = get_modifiers(event)
        view_layer = context.view_layer.name
        laycol_ptr = layer_collections[self.name]["ptr"]

        if not view_layer in rto_history["disable"]:
            rto_history["disable"][view_layer] = {"target": "", "history": []}

        target = rto_history["disable"][view_layer]["target"]
        disable_history = rto_history["disable"][view_layer]["history"]

        if modifiers == {"alt"}:
            del rto_history["disable"][view_layer]
            cls.isolated = False

        elif modifiers == {"shift"}:
            # isolate/de-isolate disablement of collections in viewport

            laycol = layer_collections[self.name]

            # get active collections
            active_layer_collections = [x["ptr"] for x in layer_collections.values()
                                        if x["ptr"].collection.hide_viewport == False]

            # check if previous state should be restored
            if cls.isolated and self.name == target:
                # restore previous state
                for x, item in enumerate(layer_collections.values()):
                    item["ptr"].collection.hide_viewport = disable_history[x]

                # reset disable history
                del rto_history["disable"][view_layer]

                cls.isolated = False

            # check if all collections should be enabled
            elif (len(active_layer_collections) == 1 and
                  active_layer_collections[0].name == self.name):
                # enable all collections in viewport
                for laycol in layer_collections.values():
                    laycol["ptr"].collection.hide_viewport = False

                # reset disable history
                del rto_history["disable"][view_layer]

                cls.isolated = False

            else:
                 # isolate disable

                rto_history["disable"][view_layer]["target"] = self.name

                # reset disable history
                disable_history.clear()

                # save state
                for item in layer_collections.values():
                    disable_history.append(item["ptr"].collection.hide_viewport)

                # disable all collections in viewport
                for laycol in layer_collections.values():
                    laycol["ptr"].collection.hide_viewport = True

                # enable active collection plus parents in viewport
                laycol_ptr.collection.hide_viewport = False

                laycol = layer_collections[self.name]
                while laycol["id"] != 0:
                    laycol["ptr"].collection.hide_viewport = False
                    laycol = laycol["parent"]

                cls.isolated = True

        elif modifiers == {"ctrl"}:
            # toggle children

            # reset disable history
            del rto_history["disable"][view_layer]

            # toggle view of collection
            state = not laycol_ptr.collection.hide_viewport
            laycol_ptr.collection.hide_viewport = state

            # pass state to children
            laycol_iter_list = [laycol_ptr.children]
            while len(laycol_iter_list) > 0:
                new_laycol_iter_list = []
                for laycol_iter in laycol_iter_list:
                    for layer_collection in laycol_iter:
                        layer_collection.collection.hide_viewport = state
                        if len(layer_collection.children) > 0:
                            new_laycol_iter_list.append(layer_collection.children)

                laycol_iter_list = new_laycol_iter_list

            cls.isolated = False

        elif modifiers == {"ctrl", "shift"}:
            # isolate nested collections

            laycol = layer_collections[self.name]

            # check if previous state should be restored
            if cls.isolated and self.name == target:
                # restore previous state
                for x, item in enumerate(layer_collections.values()):
                    item["ptr"].collection.hide_viewport = disable_history[x]

                # reset disable history
                del rto_history["disable"][view_layer]

                cls.isolated = False

            else:
                 # isolate nested disable

                rto_history["disable"][view_layer]["target"] = self.name

                # reset disable history
                disable_history.clear()

                # save state
                for item in layer_collections.values():
                    disable_history.append(item["ptr"].collection.hide_viewport)

                # get child states
                child_states = {}
                laycol_iter_list = [laycol_ptr.children]
                while len(laycol_iter_list) > 0:
                    new_laycol_iter_list = []
                    for laycol_iter in laycol_iter_list:
                        for layer_collection in laycol_iter:
                            child_states[layer_collection.name] = layer_collection.collection.hide_viewport
                            if len(layer_collection.children) > 0:
                                new_laycol_iter_list.append(layer_collection.children)

                    laycol_iter_list = new_laycol_iter_list

                # disable all collections in viewport
                for laycol in layer_collections.values():
                    laycol["ptr"].collection.hide_viewport = True

                # enable active collection plus parents in viewport
                laycol_ptr.collection.hide_viewport = False

                laycol = layer_collections[self.name]
                while laycol["id"] != 0:
                    laycol["ptr"].collection.hide_viewport = False
                    laycol = laycol["parent"]

                # restore child states
                laycol_iter_list = [laycol_ptr.children]
                while len(laycol_iter_list) > 0:
                    new_laycol_iter_list = []
                    for laycol_iter in laycol_iter_list:
                        for layer_collection in laycol_iter:
                            layer_collection.collection.hide_viewport = child_states[layer_collection.name]
                            if len(layer_collection.children) > 0:
                                new_laycol_iter_list.append(layer_collection.children)

                    laycol_iter_list = new_laycol_iter_list

                cls.isolated = True

        else:
            # toggle disable

            # reset disable history
            del rto_history["disable"][view_layer]

            # toggle disable of collection in viewport
            laycol_ptr.collection.hide_viewport = not laycol_ptr.collection.hide_viewport

            cls.isolated = False

        # reset disable all history
        if view_layer in rto_history["disable_all"]:
            del rto_history["disable_all"][view_layer]

        return {'FINISHED'}


class CMUnDisableViewportAllOperator(Operator):
    '''  * Click to toggle between current viewport display and all enabled.\n  * Shift-Click to invert viewport display of all collections\n  * Ctrl-Click to Copy/Paste RTOs\n  * Ctrl-Alt-Click to swap RTOs\n  * Alt-Click to discard history and copy/swap actions'''
    bl_label = "Toggle Viewport Display of All Collections"
    bl_idname = "view3d.un_disable_viewport_all_collections"
    bl_options = {'REGISTER', 'UNDO'}

    def invoke(self, context, event):
        global rto_history
        global copy_buffer
        global swap_buffer

        view_layer = context.view_layer.name
        modifiers = get_modifiers(event)

        if not view_layer in rto_history["disable_all"]:
            rto_history["disable_all"][view_layer] = []

        disable_all_history = rto_history["disable_all"][view_layer]

        if modifiers == {"alt"}:
            # clear RTO history
            del rto_history["disable_all"][view_layer]

            # clear copy buffer
            if copy_buffer["RTO"] == "collection.hide_viewport":
                copy_buffer["RTO"] = ""
                copy_buffer["values"].clear()

            # clear swap buffer
            if swap_buffer["A"]["RTO"] == "collection.hide_viewport":
                swap_buffer["A"]["RTO"] = ""
                swap_buffer["A"]["values"].clear()
                swap_buffer["B"]["RTO"] = ""
                swap_buffer["B"]["values"].clear()

            return {'FINISHED'}

        if modifiers == {"ctrl"}:
            if not copy_buffer["values"]:
                # copy
                copy_buffer["RTO"] = "collection.hide_viewport"
                for laycol in layer_collections.values():
                    copy_buffer["values"].append(laycol["ptr"].collection.hide_viewport)

            else:
                # paste
                for x, laycol in enumerate(layer_collections.values()):
                    laycol["ptr"].collection.hide_viewport = copy_buffer["values"][x]

                # clear copy buffer
                copy_buffer["RTO"] = ""
                copy_buffer["values"].clear()

            return {'FINISHED'}

        if modifiers == {"ctrl", "alt"}:
            if not swap_buffer["A"]["values"]:
                # get A
                swap_buffer["A"]["RTO"] = "collection.hide_viewport"
                for laycol in layer_collections.values():
                    swap_buffer["A"]["values"].append(laycol["ptr"].collection.hide_viewport)

            else:
                # get B
                swap_buffer["B"]["RTO"] = "collection.hide_viewport"
                for laycol in layer_collections.values():
                    swap_buffer["B"]["values"].append(laycol["ptr"].collection.hide_viewport)

                # swap A with B
                for x, laycol in enumerate(layer_collections.values()):
                    attr_A = attr_B = laycol["ptr"]

                    # get attributes
                    RTO_A = swap_buffer["A"]["RTO"].split(".")
                    RTO_B = swap_buffer["B"]["RTO"].split(".")

                    if RTO_A[0] == "collection":
                        attr_A = getattr(attr_A, RTO_A[0])

                    if RTO_B[0] == "collection":
                        attr_B = getattr(attr_B, RTO_B[0])


                    # swap values
                    setattr(attr_A, RTO_A[-1], swap_buffer["B"]["values"][x])
                    setattr(attr_B, RTO_B[-1], swap_buffer["A"]["values"][x])

                # clear swap buffer
                swap_buffer["A"]["RTO"] = ""
                swap_buffer["A"]["values"].clear()
                swap_buffer["B"]["RTO"] = ""
                swap_buffer["B"]["values"].clear()

            return {'FINISHED'}

        if len(disable_all_history) == 0:
            disable_all_history.clear()
            keep_history = False

            for item in layer_collections.values():
                collection = item["ptr"].collection

                if event.shift:
                    keep_history = True
                    disable_all_history.append(collection.hide_viewport)
                    collection.hide_viewport = not collection.hide_viewport

                else:
                    if collection.hide_viewport:
                        keep_history = True

                    disable_all_history.append(collection.hide_viewport)
                    collection.hide_viewport = False

            if not keep_history:
                del rto_history["disable_all"][view_layer]

        else:
            for x, item in enumerate(layer_collections.values()):
                item["ptr"].collection.hide_viewport = disable_all_history[x]

            del rto_history["disable_all"][view_layer]

        return {'FINISHED'}


class CMDisableRenderOperator(Operator):
    '''  * Shift-Click to isolate/restore previous state\n  * Ctrl-Click to toggle children\n  * Shift-Ctrl-Click to toggle nested isolation\n  * Alt-Click to discard history'''
    bl_label = "Disable Collection in Render"
    bl_idname = "view3d.disable_render_collection"
    bl_options = {'REGISTER', 'UNDO'}

    name: StringProperty()

    # static class var
    isolated = False

    def invoke(self, context, event):
        global rto_history
        cls = CMDisableRenderOperator

        modifiers = get_modifiers(event)
        view_layer = context.view_layer.name
        laycol_ptr = layer_collections[self.name]["ptr"]

        if not view_layer in rto_history["render"]:
            rto_history["render"][view_layer] = {"target": "", "history": []}

        target = rto_history["render"][view_layer]["target"]
        render_history = rto_history["render"][view_layer]["history"]


        if modifiers == {"alt"}:
            del rto_history["render"][view_layer]
            cls.isolated = False

        elif modifiers == {"shift"}:
            # isolate/de-isolate render of collections

            laycol = layer_collections[self.name]

            # get active collections
            active_layer_collections = [x["ptr"] for x in layer_collections.values()
                                        if x["ptr"].collection.hide_render == False]

            # check if previous state should be restored
            if cls.isolated and self.name == target:
                # restore previous state
                for x, item in enumerate(layer_collections.values()):
                    item["ptr"].collection.hide_render = render_history[x]

                # reset render history
                del rto_history["render"][view_layer]

                cls.isolated = False

            # check if all collections should be enabled
            elif (len(active_layer_collections) == 1 and
                  active_layer_collections[0].name == self.name):
                # allow render of all collections
                for laycol in layer_collections.values():
                    laycol["ptr"].collection.hide_render = False

                # reset render history
                del rto_history["render"][view_layer]

                cls.isolated = False

            else:
                # isolate renderability

                rto_history["render"][view_layer]["target"] = self.name

                # reset render history
                render_history.clear()

                # save state
                for item in layer_collections.values():
                    render_history.append(item["ptr"].collection.hide_render)

                # disallow render of all collections
                for laycol in layer_collections.values():
                    laycol["ptr"].collection.hide_render = True

                # allow render of active collection plus parents
                laycol_ptr.collection.hide_render = False

                laycol = layer_collections[self.name]
                while laycol["id"] != 0:
                    laycol["ptr"].collection.hide_render = False
                    laycol = laycol["parent"]

                cls.isolated = True

        elif modifiers == {"ctrl"}:
            # toggle children

            # reset render history
            del rto_history["render"][view_layer]

            # toggle view of collection
            state = not laycol_ptr.collection.hide_render
            laycol_ptr.collection.hide_render = state

            # pass state to children
            laycol_iter_list = [laycol_ptr.children]
            while len(laycol_iter_list) > 0:
                new_laycol_iter_list = []
                for laycol_iter in laycol_iter_list:
                    for layer_collection in laycol_iter:
                        layer_collection.collection.hide_render = state
                        if len(layer_collection.children) > 0:
                            new_laycol_iter_list.append(layer_collection.children)

                laycol_iter_list = new_laycol_iter_list

            cls.isolated = False

        elif modifiers == {"ctrl", "shift"}:
            # isolate nested collections

            laycol = layer_collections[self.name]

            # check if previous state should be restored
            if cls.isolated and self.name == target:
                # restore previous state
                for x, item in enumerate(layer_collections.values()):
                    item["ptr"].collection.hide_render = render_history[x]

                # reset render history
                del rto_history["render"][view_layer]

                cls.isolated = False

            else:
                # isolate nested renderability

                rto_history["render"][view_layer]["target"] = self.name

                # reset render history
                render_history.clear()

                # save state
                for item in layer_collections.values():
                    render_history.append(item["ptr"].collection.hide_render)

                # get child states
                child_states = {}
                laycol_iter_list = [laycol_ptr.children]
                while len(laycol_iter_list) > 0:
                    new_laycol_iter_list = []
                    for laycol_iter in laycol_iter_list:
                        for layer_collection in laycol_iter:
                            child_states[layer_collection.name] = layer_collection.collection.hide_render
                            if len(layer_collection.children) > 0:
                                new_laycol_iter_list.append(layer_collection.children)

                    laycol_iter_list = new_laycol_iter_list

                # disallow render of all collections
                for laycol in layer_collections.values():
                    laycol["ptr"].collection.hide_render = True

                # allow render of active collection plus parents
                laycol_ptr.collection.hide_render = False

                laycol = layer_collections[self.name]
                while laycol["id"] != 0:
                    laycol["ptr"].collection.hide_render = False
                    laycol = laycol["parent"]

                # restore child states
                laycol_iter_list = [laycol_ptr.children]
                while len(laycol_iter_list) > 0:
                    new_laycol_iter_list = []
                    for laycol_iter in laycol_iter_list:
                        for layer_collection in laycol_iter:
                            layer_collection.collection.hide_render = child_states[layer_collection.name]
                            if len(layer_collection.children) > 0:
                                new_laycol_iter_list.append(layer_collection.children)

                    laycol_iter_list = new_laycol_iter_list

                cls.isolated = True

        else:
            # toggle renderable

            # reset render history
            del rto_history["render"][view_layer]

            # toggle renderability of collection
            laycol_ptr.collection.hide_render = not laycol_ptr.collection.hide_render

            cls.isolated = False

        # reset render all history
        if view_layer in rto_history["render_all"]:
            del rto_history["render_all"][view_layer]

        return {'FINISHED'}


class CMUnDisableRenderAllOperator(Operator):
    '''  * Click to toggle between current render status and all rendered.\n  * Shift-Click to invert render status of all collections\n  * Ctrl-Click to Copy/Paste RTOs\n  * Ctrl-Alt-Click to swap RTOs\n  * Alt-Click to discard history and copy/swap actions'''
    bl_label = "Toggle Render Status of All Collections"
    bl_idname = "view3d.un_disable_render_all_collections"
    bl_options = {'REGISTER', 'UNDO'}

    def invoke(self, context, event):
        global rto_history
        global copy_buffer
        global swap_buffer

        view_layer = context.view_layer.name
        modifiers = get_modifiers(event)

        if not view_layer in rto_history["render_all"]:
            rto_history["render_all"][view_layer] = []

        render_all_history = rto_history["render_all"][view_layer]

        if modifiers == {"alt"}:
            # clear RTO history
            del rto_history["render_all"][view_layer]

            # clear copy buffer
            if copy_buffer["RTO"] == "collection.hide_render":
                copy_buffer["RTO"] = ""
                copy_buffer["values"].clear()

            # clear swap buffer
            if swap_buffer["A"]["RTO"] == "collection.hide_render":
                swap_buffer["A"]["RTO"] = ""
                swap_buffer["A"]["values"].clear()
                swap_buffer["B"]["RTO"] = ""
                swap_buffer["B"]["values"].clear()

            return {'FINISHED'}

        if modifiers == {"ctrl"}:
            if not copy_buffer["values"]:
                # copy
                copy_buffer["RTO"] = "collection.hide_render"
                for laycol in layer_collections.values():
                    copy_buffer["values"].append(laycol["ptr"].collection.hide_render)

            else:
                # paste
                for x, laycol in enumerate(layer_collections.values()):
                    laycol["ptr"].collection.hide_render = copy_buffer["values"][x]

                # clear copy buffer
                copy_buffer["RTO"] = ""
                copy_buffer["values"].clear()

            return {'FINISHED'}

        if modifiers == {"ctrl", "alt"}:
            if not swap_buffer["A"]["values"]:
                # get A
                swap_buffer["A"]["RTO"] = "collection.hide_render"
                for laycol in layer_collections.values():
                    swap_buffer["A"]["values"].append(laycol["ptr"].collection.hide_render)

            else:
                # get B
                swap_buffer["B"]["RTO"] = "collection.hide_render"
                for laycol in layer_collections.values():
                    swap_buffer["B"]["values"].append(laycol["ptr"].collection.hide_render)

                # swap A with B
                for x, laycol in enumerate(layer_collections.values()):
                    attr_A = attr_B = laycol["ptr"]

                    # get attributes
                    RTO_A = swap_buffer["A"]["RTO"].split(".")
                    RTO_B = swap_buffer["B"]["RTO"].split(".")

                    if RTO_A[0] == "collection":
                        attr_A = getattr(attr_A, RTO_A[0])

                    if RTO_B[0] == "collection":
                        attr_B = getattr(attr_B, RTO_B[0])


                    # swap values
                    setattr(attr_A, RTO_A[-1], swap_buffer["B"]["values"][x])
                    setattr(attr_B, RTO_B[-1], swap_buffer["A"]["values"][x])

                # clear swap buffer
                swap_buffer["A"]["RTO"] = ""
                swap_buffer["A"]["values"].clear()
                swap_buffer["B"]["RTO"] = ""
                swap_buffer["B"]["values"].clear()

            return {'FINISHED'}

        if len(render_all_history) == 0:
            render_all_history.clear()
            keep_history = False

            for item in layer_collections.values():
                collection = item["ptr"].collection

                if event.shift:
                    keep_history = True
                    render_all_history.append(collection.hide_render)
                    collection.hide_render = not collection.hide_render

                else:
                    if collection.hide_render:
                        keep_history = True

                    render_all_history.append(collection.hide_render)
                    collection.hide_render = False

            if not keep_history:
                del rto_history["render_all"][view_layer]

        else:
            for x, item in enumerate(layer_collections.values()):
                item["ptr"].collection.hide_render = render_all_history[x]

            del rto_history["render_all"][view_layer]

        return {'FINISHED'}


class CMRemoveCollectionOperator(Operator):
    '''Remove Collection'''
    bl_label = "Remove Collection"
    bl_idname = "view3d.remove_collection"
    bl_options = {'UNDO'}

    collection_name: StringProperty()

    def execute(self, context):
        global rto_history
        global qcd_slots

        cm = context.scene.collection_manager

        laycol = layer_collections[self.collection_name]
        collection = laycol["ptr"].collection
        parent_collection = laycol["parent"]["ptr"].collection


        # shift all objects in this collection to the parent collection
        for obj in collection.objects:
            if obj.name not in parent_collection.objects:
                parent_collection.objects.link(obj)


        # shift all child collections to the parent collection
        if collection.children:
            for subcollection in collection.children:
                parent_collection.children.link(subcollection)


        # remove collection and update tree view
        bpy.data.collections.remove(collection)
        update_property_group(context)


        if len(cm.cm_list_collection) == cm.cm_list_index:
            cm.cm_list_index = len(cm.cm_list_collection) - 1
            update_property_group(context)


        # update qcd
        if qcd_slots.contains(name=self.collection_name):
            qcd_slots.del_slot(name=self.collection_name)

        if self.collection_name in qcd_slots.overrides:
            del qcd_slots.overrides[self.collection_name]

        # reset history
        for rto in rto_history.values():
            rto.clear()

        return {'FINISHED'}

rename = [False]
class CMNewCollectionOperator(Operator):
    '''Add New Collection'''
    bl_label = "Add New Collection"
    bl_idname = "view3d.add_collection"
    bl_options = {'UNDO'}

    child: BoolProperty()

    def execute(self, context):
        global rto_history

        new_collection = bpy.data.collections.new('Collection')
        cm = context.scene.collection_manager


        # if there are collections
        if len(cm.cm_list_collection) > 0:
            # get selected collection
            laycol = layer_collections[cm.cm_list_collection[cm.cm_list_index].name]

            # add new collection
            if self.child:
                laycol["ptr"].collection.children.link(new_collection)
                expanded.append(laycol["name"])

                # update tree view property
                update_property_group(context)

                cm.cm_list_index = layer_collections[new_collection.name]["row_index"]

            else:
                laycol["parent"]["ptr"].collection.children.link(new_collection)

                # update tree view property
                update_property_group(context)

                cm.cm_list_index = layer_collections[new_collection.name]["row_index"]

        # if no collections add top level collection and select it
        else:
            context.scene.collection.children.link(new_collection)

            # update tree view property
            update_property_group(context)

            cm.cm_list_index = 0

        global rename
        rename[0] = True

        # reset history
        for rto in rto_history.values():
            rto.clear()

        return {'FINISHED'}


phantom_history = {"view_layer": "",
                   "initial_state": {},

                   "exclude_history": {},
                   "select_history": {},