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+"""The shape tree, the structure that holds a slide's shapes."""
+
+from __future__ import annotations
+
+import io
+import os
+from typing import IO, TYPE_CHECKING, Callable, Iterable, Iterator, cast
+
+from pptx.enum.shapes import PP_PLACEHOLDER, PROG_ID
+from pptx.media import SPEAKER_IMAGE_BYTES, Video
+from pptx.opc.constants import CONTENT_TYPE as CT
+from pptx.oxml.ns import qn
+from pptx.oxml.shapes.autoshape import CT_Shape
+from pptx.oxml.shapes.graphfrm import CT_GraphicalObjectFrame
+from pptx.oxml.shapes.picture import CT_Picture
+from pptx.oxml.simpletypes import ST_Direction
+from pptx.shapes.autoshape import AutoShapeType, Shape
+from pptx.shapes.base import BaseShape
+from pptx.shapes.connector import Connector
+from pptx.shapes.freeform import FreeformBuilder
+from pptx.shapes.graphfrm import GraphicFrame
+from pptx.shapes.group import GroupShape
+from pptx.shapes.picture import Movie, Picture
+from pptx.shapes.placeholder import (
+    ChartPlaceholder,
+    LayoutPlaceholder,
+    MasterPlaceholder,
+    NotesSlidePlaceholder,
+    PicturePlaceholder,
+    PlaceholderGraphicFrame,
+    PlaceholderPicture,
+    SlidePlaceholder,
+    TablePlaceholder,
+)
+from pptx.shared import ParentedElementProxy
+from pptx.util import Emu, lazyproperty
+
+if TYPE_CHECKING:
+    from pptx.chart.chart import Chart
+    from pptx.chart.data import ChartData
+    from pptx.enum.chart import XL_CHART_TYPE
+    from pptx.enum.shapes import MSO_CONNECTOR_TYPE, MSO_SHAPE
+    from pptx.oxml.shapes import ShapeElement
+    from pptx.oxml.shapes.connector import CT_Connector
+    from pptx.oxml.shapes.groupshape import CT_GroupShape
+    from pptx.parts.image import ImagePart
+    from pptx.parts.slide import SlidePart
+    from pptx.slide import Slide, SlideLayout
+    from pptx.types import ProvidesPart
+    from pptx.util import Length
+
+# +-- _BaseShapes
+# |   |
+# |   +-- _BaseGroupShapes
+# |   |   |
+# |   |   +-- GroupShapes
+# |   |   |
+# |   |   +-- SlideShapes
+# |   |
+# |   +-- LayoutShapes
+# |   |
+# |   +-- MasterShapes
+# |   |
+# |   +-- NotesSlideShapes
+# |   |
+# |   +-- BasePlaceholders
+# |       |
+# |       +-- LayoutPlaceholders
+# |       |
+# |       +-- MasterPlaceholders
+# |           |
+# |           +-- NotesSlidePlaceholders
+# |
+# +-- SlidePlaceholders
+
+
+class _BaseShapes(ParentedElementProxy):
+    """Base class for a shape collection appearing in a slide-type object.
+
+    Subclasses include Slide, SlideLayout, and SlideMaster. Provides common methods.
+    """
+
+    def __init__(self, spTree: CT_GroupShape, parent: ProvidesPart):
+        super(_BaseShapes, self).__init__(spTree, parent)
+        self._spTree = spTree
+        self._cached_max_shape_id = None
+
+    def __getitem__(self, idx: int) -> BaseShape:
+        """Return shape at `idx` in sequence, e.g. `shapes[2]`."""
+        shape_elms = list(self._iter_member_elms())
+        try:
+            shape_elm = shape_elms[idx]
+        except IndexError:
+            raise IndexError("shape index out of range")
+        return self._shape_factory(shape_elm)
+
+    def __iter__(self) -> Iterator[BaseShape]:
+        """Generate a reference to each shape in the collection, in sequence."""
+        for shape_elm in self._iter_member_elms():
+            yield self._shape_factory(shape_elm)
+
+    def __len__(self) -> int:
+        """Return count of shapes in this shape tree.
+
+        A group shape contributes 1 to the total, without regard to the number of shapes contained
+        in the group.
+        """
+        shape_elms = list(self._iter_member_elms())
+        return len(shape_elms)
+
+    def clone_placeholder(self, placeholder: LayoutPlaceholder) -> None:
+        """Add a new placeholder shape based on `placeholder`."""
+        sp = placeholder.element
+        ph_type, orient, sz, idx = (sp.ph_type, sp.ph_orient, sp.ph_sz, sp.ph_idx)
+        id_ = self._next_shape_id
+        name = self._next_ph_name(ph_type, id_, orient)
+        self._spTree.add_placeholder(id_, name, ph_type, orient, sz, idx)
+
+    def ph_basename(self, ph_type: PP_PLACEHOLDER) -> str:
+        """Return the base name for a placeholder of `ph_type` in this shape collection.
+
+        There is some variance between slide types, for example a notes slide uses a different
+        name for the body placeholder, so this method can be overriden by subclasses.
+        """
+        return {
+            PP_PLACEHOLDER.BITMAP: "ClipArt Placeholder",
+            PP_PLACEHOLDER.BODY: "Text Placeholder",
+            PP_PLACEHOLDER.CENTER_TITLE: "Title",
+            PP_PLACEHOLDER.CHART: "Chart Placeholder",
+            PP_PLACEHOLDER.DATE: "Date Placeholder",
+            PP_PLACEHOLDER.FOOTER: "Footer Placeholder",
+            PP_PLACEHOLDER.HEADER: "Header Placeholder",
+            PP_PLACEHOLDER.MEDIA_CLIP: "Media Placeholder",
+            PP_PLACEHOLDER.OBJECT: "Content Placeholder",
+            PP_PLACEHOLDER.ORG_CHART: "SmartArt Placeholder",
+            PP_PLACEHOLDER.PICTURE: "Picture Placeholder",
+            PP_PLACEHOLDER.SLIDE_NUMBER: "Slide Number Placeholder",
+            PP_PLACEHOLDER.SUBTITLE: "Subtitle",
+            PP_PLACEHOLDER.TABLE: "Table Placeholder",
+            PP_PLACEHOLDER.TITLE: "Title",
+        }[ph_type]
+
+    @property
+    def turbo_add_enabled(self) -> bool:
+        """True if "turbo-add" mode is enabled. Read/Write.
+
+        EXPERIMENTAL: This feature can radically improve performance when adding large numbers
+        (hundreds of shapes) to a slide. It works by caching the last shape ID used and
+        incrementing that value to assign the next shape id. This avoids repeatedly searching all
+        shape ids in the slide each time a new ID is required.
+
+        Performance is not noticeably improved for a slide with a relatively small number of
+        shapes, but because the search time rises with the square of the shape count, this option
+        can be useful for optimizing generation of a slide composed of many shapes.
+
+        Shape-id collisions can occur (causing a repair error on load) if more than one |Slide|
+        object is used to interact with the same slide in the presentation. Note that the |Slides|
+        collection creates a new |Slide| object each time a slide is accessed (e.g. `slide =
+        prs.slides[0]`, so you must be careful to limit use to a single |Slide| object.
+        """
+        return self._cached_max_shape_id is not None
+
+    @turbo_add_enabled.setter
+    def turbo_add_enabled(self, value: bool):
+        enable = bool(value)
+        self._cached_max_shape_id = self._spTree.max_shape_id if enable else None
+
+    @staticmethod
+    def _is_member_elm(shape_elm: ShapeElement) -> bool:
+        """Return true if `shape_elm` represents a member of this collection, False otherwise."""
+        return True
+
+    def _iter_member_elms(self) -> Iterator[ShapeElement]:
+        """Generate each child of the `p:spTree` element that corresponds to a shape.
+
+        Items appear in XML document order.
+        """
+        for shape_elm in self._spTree.iter_shape_elms():
+            if self._is_member_elm(shape_elm):
+                yield shape_elm
+
+    def _next_ph_name(self, ph_type: PP_PLACEHOLDER, id: int, orient: str) -> str:
+        """Next unique placeholder name for placeholder shape of type `ph_type`.
+
+        Usually will be standard placeholder root name suffixed with id-1, e.g.
+        _next_ph_name(ST_PlaceholderType.TBL, 4, 'horz') ==> 'Table Placeholder 3'. The number is
+        incremented as necessary to make the name unique within the collection. If `orient` is
+        `'vert'`, the placeholder name is prefixed with `'Vertical '`.
+        """
+        basename = self.ph_basename(ph_type)
+
+        # prefix rootname with 'Vertical ' if orient is 'vert'
+        if orient == ST_Direction.VERT:
+            basename = "Vertical %s" % basename
+
+        # increment numpart as necessary to make name unique
+        numpart = id - 1
+        names = self._spTree.xpath("//p:cNvPr/@name")
+        while True:
+            name = "%s %d" % (basename, numpart)
+            if name not in names:
+                break
+            numpart += 1
+
+        return name
+
+    @property
+    def _next_shape_id(self) -> int:
+        """Return a unique shape id suitable for use with a new shape.
+
+        The returned id is 1 greater than the maximum shape id used so far. In practice, the
+        minimum id is 2 because the spTree element is always assigned id="1".
+        """
+        # ---presence of cached-max-shape-id indicates turbo mode is on---
+        if self._cached_max_shape_id is not None:
+            self._cached_max_shape_id += 1
+            return self._cached_max_shape_id
+
+        return self._spTree.max_shape_id + 1
+
+    def _shape_factory(self, shape_elm: ShapeElement) -> BaseShape:
+        """Return an instance of the appropriate shape proxy class for `shape_elm`."""
+        return BaseShapeFactory(shape_elm, self)
+
+
+class _BaseGroupShapes(_BaseShapes):
+    """Base class for shape-trees that can add shapes."""
+
+    part: SlidePart  # pyright: ignore[reportIncompatibleMethodOverride]
+    _element: CT_GroupShape
+
+    def __init__(self, grpSp: CT_GroupShape, parent: ProvidesPart):
+        super(_BaseGroupShapes, self).__init__(grpSp, parent)
+        self._grpSp = grpSp
+
+    def add_chart(
+        self,
+        chart_type: XL_CHART_TYPE,
+        x: Length,
+        y: Length,
+        cx: Length,
+        cy: Length,
+        chart_data: ChartData,
+    ) -> Chart:
+        """Add a new chart of `chart_type` to the slide.
+
+        The chart is positioned at (`x`, `y`), has size (`cx`, `cy`), and depicts `chart_data`.
+        `chart_type` is one of the :ref:`XlChartType` enumeration values. `chart_data` is a
+        |ChartData| object populated with the categories and series values for the chart.
+
+        Note that a |GraphicFrame| shape object is returned, not the |Chart| object contained in
+        that graphic frame shape. The chart object may be accessed using the :attr:`chart`
+        property of the returned |GraphicFrame| object.
+        """
+        rId = self.part.add_chart_part(chart_type, chart_data)
+        graphicFrame = self._add_chart_graphicFrame(rId, x, y, cx, cy)
+        self._recalculate_extents()
+        return cast("Chart", self._shape_factory(graphicFrame))
+
+    def add_connector(
+        self,
+        connector_type: MSO_CONNECTOR_TYPE,
+        begin_x: Length,
+        begin_y: Length,
+        end_x: Length,
+        end_y: Length,
+    ) -> Connector:
+        """Add a newly created connector shape to the end of this shape tree.
+
+        `connector_type` is a member of the :ref:`MsoConnectorType` enumeration and the end-point
+        values are specified as EMU values. The returned connector is of type `connector_type` and
+        has begin and end points as specified.
+        """
+        cxnSp = self._add_cxnSp(connector_type, begin_x, begin_y, end_x, end_y)
+        self._recalculate_extents()
+        return cast(Connector, self._shape_factory(cxnSp))
+
+    def add_group_shape(self, shapes: Iterable[BaseShape] = ()) -> GroupShape:
+        """Return a |GroupShape| object newly appended to this shape tree.
+
+        The group shape is empty and must be populated with shapes using methods on its shape
+        tree, available on its `.shapes` property. The position and extents of the group shape are
+        determined by the shapes it contains; its position and extents are recalculated each time
+        a shape is added to it.
+        """
+        shapes = tuple(shapes)
+        grpSp = self._element.add_grpSp()
+        for shape in shapes:
+            grpSp.insert_element_before(
+                shape._element, "p:extLst"  # pyright: ignore[reportPrivateUsage]
+            )
+        if shapes:
+            grpSp.recalculate_extents()
+        return cast(GroupShape, self._shape_factory(grpSp))
+
+    def add_ole_object(
+        self,
+        object_file: str | IO[bytes],
+        prog_id: str,
+        left: Length,
+        top: Length,
+        width: Length | None = None,
+        height: Length | None = None,
+        icon_file: str | IO[bytes] | None = None,
+        icon_width: Length | None = None,
+        icon_height: Length | None = None,
+    ) -> GraphicFrame:
+        """Return newly-created GraphicFrame shape embedding `object_file`.
+
+        The returned graphic-frame shape contains `object_file` as an embedded OLE object. It is
+        displayed as an icon at `left`, `top` with size `width`, `height`. `width` and `height`
+        may be omitted when `prog_id` is a member of `PROG_ID`, in which case the default icon
+        size is used. This is advised for best appearance where applicable because it avoids an
+        icon with a "stretched" appearance.
+
+        `object_file` may either be a str path to a file or file-like object (such as
+        `io.BytesIO`) containing the bytes of the object to be embedded (such as an Excel file).
+
+        `prog_id` can be either a member of `pptx.enum.shapes.PROG_ID` or a str value like
+        `"Adobe.Exchange.7"` determined by inspecting the XML generated by PowerPoint for an
+        object of the desired type.
+
+        `icon_file` may either be a str path to an image file or a file-like object containing the
+        image. The image provided will be displayed in lieu of the OLE object; double-clicking on
+        the image opens the object (subject to operating-system limitations). The image file can
+        be any supported image file. Those produced by PowerPoint itself are generally EMF and can
+        be harvested from a PPTX package that embeds such an object. PNG and JPG also work fine.
+
+        `icon_width` and `icon_height` are `Length` values (e.g. Emu() or Inches()) that describe
+        the size of the icon image within the shape. These should be omitted unless a custom
+        `icon_file` is provided. The dimensions must be discovered by inspecting the XML.
+        Automatic resizing of the OLE-object shape can occur when the icon is double-clicked if
+        these values are not as set by PowerPoint. This behavior may only manifest in the Windows
+        version of PowerPoint.
+        """
+        graphicFrame = _OleObjectElementCreator.graphicFrame(
+            self,
+            self._next_shape_id,
+            object_file,
+            prog_id,
+            left,
+            top,
+            width,
+            height,
+            icon_file,
+            icon_width,
+            icon_height,
+        )
+        self._spTree.append(graphicFrame)
+        self._recalculate_extents()
+        return cast(GraphicFrame, self._shape_factory(graphicFrame))
+
+    def add_picture(
+        self,
+        image_file: str | IO[bytes],
+        left: Length,
+        top: Length,
+        width: Length | None = None,
+        height: Length | None = None,
+    ) -> Picture:
+        """Add picture shape displaying image in `image_file`.
+
+        `image_file` can be either a path to a file (a string) or a file-like object. The picture
+        is positioned with its top-left corner at (`top`, `left`). If `width` and `height` are
+        both |None|, the native size of the image is used. If only one of `width` or `height` is
+        used, the unspecified dimension is calculated to preserve the aspect ratio of the image.
+        If both are specified, the picture is stretched to fit, without regard to its native
+        aspect ratio.
+        """
+        image_part, rId = self.part.get_or_add_image_part(image_file)
+        pic = self._add_pic_from_image_part(image_part, rId, left, top, width, height)
+        self._recalculate_extents()
+        return cast(Picture, self._shape_factory(pic))
+
+    def add_shape(
+        self, autoshape_type_id: MSO_SHAPE, left: Length, top: Length, width: Length, height: Length
+    ) -> Shape:
+        """Return new |Shape| object appended to this shape tree.
+
+        `autoshape_type_id` is a member of :ref:`MsoAutoShapeType` e.g. `MSO_SHAPE.RECTANGLE`
+        specifying the type of shape to be added. The remaining arguments specify the new shape's
+        position and size.
+        """
+        autoshape_type = AutoShapeType(autoshape_type_id)
+        sp = self._add_sp(autoshape_type, left, top, width, height)
+        self._recalculate_extents()
+        return cast(Shape, self._shape_factory(sp))
+
+    def add_textbox(self, left: Length, top: Length, width: Length, height: Length) -> Shape:
+        """Return newly added text box shape appended to this shape tree.
+
+        The text box is of the specified size, located at the specified position on the slide.
+        """
+        sp = self._add_textbox_sp(left, top, width, height)
+        self._recalculate_extents()
+        return cast(Shape, self._shape_factory(sp))
+
+    def build_freeform(
+        self, start_x: float = 0, start_y: float = 0, scale: tuple[float, float] | float = 1.0
+    ) -> FreeformBuilder:
+        """Return |FreeformBuilder| object to specify a freeform shape.
+
+        The optional `start_x` and `start_y` arguments specify the starting pen position in local
+        coordinates. They will be rounded to the nearest integer before use and each default to
+        zero.
+
+        The optional `scale` argument specifies the size of local coordinates proportional to
+        slide coordinates (EMU). If the vertical scale is different than the horizontal scale
+        (local coordinate units are "rectangular"), a pair of numeric values can be provided as
+        the `scale` argument, e.g. `scale=(1.0, 2.0)`. In this case the first number is
+        interpreted as the horizontal (X) scale and the second as the vertical (Y) scale.
+
+        A convenient method for calculating scale is to divide a |Length| object by an equivalent
+        count of local coordinate units, e.g. `scale = Inches(1)/1000` for 1000 local units per
+        inch.
+        """
+        x_scale, y_scale = scale if isinstance(scale, tuple) else (scale, scale)
+
+        return FreeformBuilder.new(self, start_x, start_y, x_scale, y_scale)
+
+    def index(self, shape: BaseShape) -> int:
+        """Return the index of `shape` in this sequence.
+
+        Raises |ValueError| if `shape` is not in the collection.
+        """
+        shape_elms = list(self._element.iter_shape_elms())
+        return shape_elms.index(shape.element)
+
+    def _add_chart_graphicFrame(
+        self, rId: str, x: Length, y: Length, cx: Length, cy: Length
+    ) -> CT_GraphicalObjectFrame:
+        """Return new `p:graphicFrame` element appended to this shape tree.
+
+        The `p:graphicFrame` element has the specified position and size and refers to the chart
+        part identified by `rId`.
+        """
+        shape_id = self._next_shape_id
+        name = "Chart %d" % (shape_id - 1)
+        graphicFrame = CT_GraphicalObjectFrame.new_chart_graphicFrame(
+            shape_id, name, rId, x, y, cx, cy
+        )
+        self._spTree.append(graphicFrame)
+        return graphicFrame
+
+    def _add_cxnSp(
+        self,
+        connector_type: MSO_CONNECTOR_TYPE,
+        begin_x: Length,
+        begin_y: Length,
+        end_x: Length,
+        end_y: Length,
+    ) -> CT_Connector:
+        """Return a newly-added `p:cxnSp` element as specified.
+
+        The `p:cxnSp` element is for a connector of `connector_type` beginning at (`begin_x`,
+        `begin_y`) and extending to (`end_x`, `end_y`).
+        """
+        id_ = self._next_shape_id
+        name = "Connector %d" % (id_ - 1)
+
+        flipH, flipV = begin_x > end_x, begin_y > end_y
+        x, y = min(begin_x, end_x), min(begin_y, end_y)
+        cx, cy = abs(end_x - begin_x), abs(end_y - begin_y)
+
+        return self._element.add_cxnSp(id_, name, connector_type, x, y, cx, cy, flipH, flipV)
+
+    def _add_pic_from_image_part(
+        self,
+        image_part: ImagePart,
+        rId: str,
+        x: Length,
+        y: Length,
+        cx: Length | None,
+        cy: Length | None,
+    ) -> CT_Picture:
+        """Return a newly appended `p:pic` element as specified.
+
+        The `p:pic` element displays the image in `image_part` with size and position specified by
+        `x`, `y`, `cx`, and `cy`. The element is appended to the shape tree, causing it to be
+        displayed first in z-order on the slide.
+        """
+        id_ = self._next_shape_id
+        scaled_cx, scaled_cy = image_part.scale(cx, cy)
+        name = "Picture %d" % (id_ - 1)
+        desc = image_part.desc
+        pic = self._grpSp.add_pic(id_, name, desc, rId, x, y, scaled_cx, scaled_cy)
+        return pic
+
+    def _add_sp(
+        self, autoshape_type: AutoShapeType, x: Length, y: Length, cx: Length, cy: Length
+    ) -> CT_Shape:
+        """Return newly-added `p:sp` element as specified.
+
+        `p:sp` element is of `autoshape_type` at position (`x`, `y`) and of size (`cx`, `cy`).
+        """
+        id_ = self._next_shape_id
+        name = "%s %d" % (autoshape_type.basename, id_ - 1)
+        sp = self._grpSp.add_autoshape(id_, name, autoshape_type.prst, x, y, cx, cy)
+        return sp
+
+    def _add_textbox_sp(self, x: Length, y: Length, cx: Length, cy: Length) -> CT_Shape:
+        """Return newly-appended textbox `p:sp` element.
+
+        Element has position (`x`, `y`) and size (`cx`, `cy`).
+        """
+        id_ = self._next_shape_id
+        name = "TextBox %d" % (id_ - 1)
+        sp = self._spTree.add_textbox(id_, name, x, y, cx, cy)
+        return sp
+
+    def _recalculate_extents(self) -> None:
+        """Adjust position and size to incorporate all contained shapes.
+
+        This would typically be called when a contained shape is added, removed, or its position
+        or size updated.
+        """
+        # ---default behavior is to do nothing, GroupShapes overrides to
+        #    produce the distinctive behavior of groups and subgroups.---
+        pass
+
+
+class GroupShapes(_BaseGroupShapes):
+    """The sequence of child shapes belonging to a group shape.
+
+    Note that this collection can itself contain a group shape, making this part of a recursive,
+    tree data structure (acyclic graph).
+    """
+
+    def _recalculate_extents(self) -> None:
+        """Adjust position and size to incorporate all contained shapes.
+
+        This would typically be called when a contained shape is added, removed, or its position
+        or size updated.
+        """
+        self._grpSp.recalculate_extents()
+
+
+class SlideShapes(_BaseGroupShapes):
+    """Sequence of shapes appearing on a slide.
+
+    The first shape in the sequence is the backmost in z-order and the last shape is topmost.
+    Supports indexed access, len(), index(), and iteration.
+    """
+
+    parent: Slide  # pyright: ignore[reportIncompatibleMethodOverride]
+
+    def add_movie(
+        self,
+        movie_file: str | IO[bytes],
+        left: Length,
+        top: Length,
+        width: Length,
+        height: Length,
+        poster_frame_image: str | IO[bytes] | None = None,
+        mime_type: str = CT.VIDEO,
+    ) -> GraphicFrame:
+        """Return newly added movie shape displaying video in `movie_file`.
+
+        **EXPERIMENTAL.** This method has important limitations:
+
+        * The size must be specified; no auto-scaling such as that provided by :meth:`add_picture`
+          is performed.
+        * The MIME type of the video file should be specified, e.g. 'video/mp4'. The provided
+          video file is not interrogated for its type. The MIME type `video/unknown` is used by
+          default (and works fine in tests as of this writing).
+        * A poster frame image must be provided, it cannot be automatically extracted from the
+          video file. If no poster frame is provided, the default "media loudspeaker" image will
+          be used.
+
+        Return a newly added movie shape to the slide, positioned at (`left`, `top`), having size
+        (`width`, `height`), and containing `movie_file`. Before the video is started,
+        `poster_frame_image` is displayed as a placeholder for the video.
+        """
+        movie_pic = _MoviePicElementCreator.new_movie_pic(
+            self,
+            self._next_shape_id,
+            movie_file,
+            left,
+            top,
+            width,
+            height,
+            poster_frame_image,
+            mime_type,
+        )
+        self._spTree.append(movie_pic)
+        self._add_video_timing(movie_pic)
+        return cast(GraphicFrame, self._shape_factory(movie_pic))
+
+    def add_table(
+        self, rows: int, cols: int, left: Length, top: Length, width: Length, height: Length
+    ) -> GraphicFrame:
+        """Add a |GraphicFrame| object containing a table.
+
+        The table has the specified number of `rows` and `cols` and the specified position and
+        size. `width` is evenly distributed between the columns of the new table. Likewise,
+        `height` is evenly distributed between the rows. Note that the `.table` property on the
+        returned |GraphicFrame| shape must be used to access the enclosed |Table| object.
+        """
+        graphicFrame = self._add_graphicFrame_containing_table(rows, cols, left, top, width, height)
+        return cast(GraphicFrame, self._shape_factory(graphicFrame))
+
+    def clone_layout_placeholders(self, slide_layout: SlideLayout) -> None:
+        """Add placeholder shapes based on those in `slide_layout`.
+
+        Z-order of placeholders is preserved. Latent placeholders (date, slide number, and footer)
+        are not cloned.
+        """
+        for placeholder in slide_layout.iter_cloneable_placeholders():
+            self.clone_placeholder(placeholder)
+
+    @property
+    def placeholders(self) -> SlidePlaceholders:
+        """Sequence of placeholder shapes in this slide."""
+        return self.parent.placeholders
+
+    @property
+    def title(self) -> Shape | None:
+        """The title placeholder shape on the slide.
+
+        |None| if the slide has no title placeholder.
+        """
+        for elm in self._spTree.iter_ph_elms():
+            if elm.ph_idx == 0:
+                return cast(Shape, self._shape_factory(elm))
+        return None
+
+    def _add_graphicFrame_containing_table(
+        self, rows: int, cols: int, x: Length, y: Length, cx: Length, cy: Length
+    ) -> CT_GraphicalObjectFrame:
+        """Return a newly added `p:graphicFrame` element containing a table as specified."""
+        _id = self._next_shape_id
+        name = "Table %d" % (_id - 1)
+        graphicFrame = self._spTree.add_table(_id, name, rows, cols, x, y, cx, cy)
+        return graphicFrame
+
+    def _add_video_timing(self, pic: CT_Picture) -> None:
+        """Add a `p:video` element under `p:sld/p:timing`.
+
+        The element will refer to the specified `pic` element by its shape id, and cause the video
+        play controls to appear for that video.
+        """
+        sld = self._spTree.xpath("/p:sld")[0]
+        childTnLst = sld.get_or_add_childTnLst()
+        childTnLst.add_video(pic.shape_id)
+
+    def _shape_factory(self, shape_elm: ShapeElement) -> BaseShape:
+        """Return an instance of the appropriate shape proxy class for `shape_elm`."""
+        return SlideShapeFactory(shape_elm, self)
+
+
+class LayoutShapes(_BaseShapes):
+    """Sequence of shapes appearing on a slide layout.
+
+    The first shape in the sequence is the backmost in z-order and the last shape is topmost.
+    Supports indexed access, len(), index(), and iteration.
+    """
+
+    def _shape_factory(self, shape_elm: ShapeElement) -> BaseShape:
+        """Return an instance of the appropriate shape proxy class for `shape_elm`."""
+        return _LayoutShapeFactory(shape_elm, self)
+
+
+class MasterShapes(_BaseShapes):
+    """Sequence of shapes appearing on a slide master.
+
+    The first shape in the sequence is the backmost in z-order and the last shape is topmost.
+    Supports indexed access, len(), and iteration.
+    """
+
+    def _shape_factory(self, shape_elm: ShapeElement) -> BaseShape:
+        """Return an instance of the appropriate shape proxy class for `shape_elm`."""
+        return _MasterShapeFactory(shape_elm, self)
+
+
+class NotesSlideShapes(_BaseShapes):
+    """Sequence of shapes appearing on a notes slide.
+
+    The first shape in the sequence is the backmost in z-order and the last shape is topmost.
+    Supports indexed access, len(), index(), and iteration.
+    """
+
+    def ph_basename(self, ph_type: PP_PLACEHOLDER) -> str:
+        """Return the base name for a placeholder of `ph_type` in this shape collection.
+
+        A notes slide uses a different name for the body placeholder and has some unique
+        placeholder types, so this method overrides the default in the base class.
+        """
+        return {
+            PP_PLACEHOLDER.BODY: "Notes Placeholder",
+            PP_PLACEHOLDER.DATE: "Date Placeholder",
+            PP_PLACEHOLDER.FOOTER: "Footer Placeholder",
+            PP_PLACEHOLDER.HEADER: "Header Placeholder",
+            PP_PLACEHOLDER.SLIDE_IMAGE: "Slide Image Placeholder",
+            PP_PLACEHOLDER.SLIDE_NUMBER: "Slide Number Placeholder",
+        }[ph_type]
+
+    def _shape_factory(self, shape_elm: ShapeElement) -> BaseShape:
+        """Return appropriate shape object for `shape_elm` appearing on a notes slide."""
+        return _NotesSlideShapeFactory(shape_elm, self)
+
+
+class BasePlaceholders(_BaseShapes):
+    """Base class for placeholder collections.
+
+    Subclasses differentiate behaviors for a master, layout, and slide. By default, placeholder
+    shapes are constructed using |BaseShapeFactory|. Subclasses should override
+    :method:`_shape_factory` to use custom placeholder classes.
+    """
+
+    @staticmethod
+    def _is_member_elm(shape_elm: ShapeElement) -> bool:
+        """True if `shape_elm` is a placeholder shape, False otherwise."""
+        return shape_elm.has_ph_elm
+
+
+class LayoutPlaceholders(BasePlaceholders):
+    """Sequence of |LayoutPlaceholder| instance for each placeholder shape on a slide layout."""
+
+    __iter__: Callable[  # pyright: ignore[reportIncompatibleMethodOverride]
+        [], Iterator[LayoutPlaceholder]
+    ]
+
+    def get(self, idx: int, default: LayoutPlaceholder | None = None) -> LayoutPlaceholder | None:
+        """The first placeholder shape with matching `idx` value, or `default` if not found."""
+        for placeholder in self:
+            if placeholder.element.ph_idx == idx:
+                return placeholder
+        return default
+
+    def _shape_factory(self, shape_elm: ShapeElement) -> BaseShape:
+        """Return an instance of the appropriate shape proxy class for `shape_elm`."""
+        return _LayoutShapeFactory(shape_elm, self)
+
+
+class MasterPlaceholders(BasePlaceholders):
+    """Sequence of MasterPlaceholder representing the placeholder shapes on a slide master."""
+
+    __iter__: Callable[  # pyright: ignore[reportIncompatibleMethodOverride]
+        [], Iterator[MasterPlaceholder]
+    ]
+
+    def get(self, ph_type: PP_PLACEHOLDER, default: MasterPlaceholder | None = None):
+        """Return the first placeholder shape with type `ph_type` (e.g. 'body').
+
+        Returns `default` if no such placeholder shape is present in the collection.
+        """
+        for placeholder in self:
+            if placeholder.ph_type == ph_type:
+                return placeholder
+        return default
+
+    def _shape_factory(  # pyright: ignore[reportIncompatibleMethodOverride]
+        self, placeholder_elm: CT_Shape
+    ) -> MasterPlaceholder:
+        """Return an instance of the appropriate shape proxy class for `shape_elm`."""
+        return cast(MasterPlaceholder, _MasterShapeFactory(placeholder_elm, self))
+
+
+class NotesSlidePlaceholders(MasterPlaceholders):
+    """Sequence of placeholder shapes on a notes slide."""
+
+    __iter__: Callable[  # pyright: ignore[reportIncompatibleMethodOverride]
+        [], Iterator[NotesSlidePlaceholder]
+    ]
+
+    def _shape_factory(  # pyright: ignore[reportIncompatibleMethodOverride]
+        self, placeholder_elm: CT_Shape
+    ) -> NotesSlidePlaceholder:
+        """Return an instance of the appropriate placeholder proxy class for `placeholder_elm`."""
+        return cast(NotesSlidePlaceholder, _NotesSlideShapeFactory(placeholder_elm, self))
+
+
+class SlidePlaceholders(ParentedElementProxy):
+    """Collection of placeholder shapes on a slide.
+
+    Supports iteration, :func:`len`, and dictionary-style lookup on the `idx` value of the
+    placeholders it contains.
+    """
+
+    _element: CT_GroupShape
+
+    def __getitem__(self, idx: int):
+        """Access placeholder shape having `idx`.
+
+        Note that while this looks like list access, idx is actually a dictionary key and will
+        raise |KeyError| if no placeholder with that idx value is in the collection.
+        """
+        for e in self._element.iter_ph_elms():
+            if e.ph_idx == idx:
+                return SlideShapeFactory(e, self)
+        raise KeyError("no placeholder on this slide with idx == %d" % idx)
+
+    def __iter__(self):
+        """Generate placeholder shapes in `idx` order."""
+        ph_elms = sorted([e for e in self._element.iter_ph_elms()], key=lambda e: e.ph_idx)
+        return (SlideShapeFactory(e, self) for e in ph_elms)
+
+    def __len__(self) -> int:
+        """Return count of placeholder shapes."""
+        return len(list(self._element.iter_ph_elms()))
+
+
+def BaseShapeFactory(shape_elm: ShapeElement, parent: ProvidesPart) -> BaseShape:
+    """Return an instance of the appropriate shape proxy class for `shape_elm`."""
+    tag = shape_elm.tag
+
+    if isinstance(shape_elm, CT_Picture):
+        videoFiles = shape_elm.xpath("./p:nvPicPr/p:nvPr/a:videoFile")
+        if videoFiles:
+            return Movie(shape_elm, parent)
+        return Picture(shape_elm, parent)
+
+    shape_cls = {
+        qn("p:cxnSp"): Connector,
+        qn("p:grpSp"): GroupShape,
+        qn("p:sp"): Shape,
+        qn("p:graphicFrame"): GraphicFrame,
+    }.get(tag, BaseShape)
+
+    return shape_cls(shape_elm, parent)  # pyright: ignore[reportArgumentType]
+
+
+def _LayoutShapeFactory(shape_elm: ShapeElement, parent: ProvidesPart) -> BaseShape:
+    """Return appropriate shape object for `shape_elm` on a slide layout."""
+    if isinstance(shape_elm, CT_Shape) and shape_elm.has_ph_elm:
+        return LayoutPlaceholder(shape_elm, parent)
+    return BaseShapeFactory(shape_elm, parent)
+
+
+def _MasterShapeFactory(shape_elm: ShapeElement, parent: ProvidesPart) -> BaseShape:
+    """Return appropriate shape object for `shape_elm` on a slide master."""
+    if isinstance(shape_elm, CT_Shape) and shape_elm.has_ph_elm:
+        return MasterPlaceholder(shape_elm, parent)
+    return BaseShapeFactory(shape_elm, parent)
+
+
+def _NotesSlideShapeFactory(shape_elm: ShapeElement, parent: ProvidesPart) -> BaseShape:
+    """Return appropriate shape object for `shape_elm` on a notes slide."""
+    if isinstance(shape_elm, CT_Shape) and shape_elm.has_ph_elm:
+        return NotesSlidePlaceholder(shape_elm, parent)
+    return BaseShapeFactory(shape_elm, parent)
+
+
+def _SlidePlaceholderFactory(shape_elm: ShapeElement, parent: ProvidesPart):
+    """Return a placeholder shape of the appropriate type for `shape_elm`."""
+    tag = shape_elm.tag
+    if tag == qn("p:sp"):
+        Constructor = {
+            PP_PLACEHOLDER.BITMAP: PicturePlaceholder,
+            PP_PLACEHOLDER.CHART: ChartPlaceholder,
+            PP_PLACEHOLDER.PICTURE: PicturePlaceholder,
+            PP_PLACEHOLDER.TABLE: TablePlaceholder,
+        }.get(shape_elm.ph_type, SlidePlaceholder)
+    elif tag == qn("p:graphicFrame"):
+        Constructor = PlaceholderGraphicFrame
+    elif tag == qn("p:pic"):
+        Constructor = PlaceholderPicture
+    else:
+        Constructor = BaseShapeFactory
+    return Constructor(shape_elm, parent)  # pyright: ignore[reportArgumentType]
+
+
+def SlideShapeFactory(shape_elm: ShapeElement, parent: ProvidesPart) -> BaseShape:
+    """Return appropriate shape object for `shape_elm` on a slide."""
+    if shape_elm.has_ph_elm:
+        return _SlidePlaceholderFactory(shape_elm, parent)
+    return BaseShapeFactory(shape_elm, parent)
+
+
+class _MoviePicElementCreator(object):
+    """Functional service object for creating a new movie p:pic element.
+
+    It's entire external interface is its :meth:`new_movie_pic` class method that returns a new
+    `p:pic` element containing the specified video. This class is not intended to be constructed
+    or an instance of it retained by the caller; it is a "one-shot" object, really a function
+    wrapped in a object such that its helper methods can be organized here.
+    """
+
+    def __init__(
+        self,
+        shapes: SlideShapes,
+        shape_id: int,
+        movie_file: str | IO[bytes],
+        x: Length,
+        y: Length,
+        cx: Length,
+        cy: Length,
+        poster_frame_file: str | IO[bytes] | None,
+        mime_type: str | None,
+    ):
+        super(_MoviePicElementCreator, self).__init__()
+        self._shapes = shapes
+        self._shape_id = shape_id
+        self._movie_file = movie_file
+        self._x, self._y, self._cx, self._cy = x, y, cx, cy
+        self._poster_frame_file = poster_frame_file
+        self._mime_type = mime_type
+
+    @classmethod
+    def new_movie_pic(
+        cls,
+        shapes: SlideShapes,
+        shape_id: int,
+        movie_file: str | IO[bytes],
+        x: Length,
+        y: Length,
+        cx: Length,
+        cy: Length,
+        poster_frame_image: str | IO[bytes] | None,
+        mime_type: str | None,
+    ) -> CT_Picture:
+        """Return a new `p:pic` element containing video in `movie_file`.
+
+        If `mime_type` is None, 'video/unknown' is used. If `poster_frame_file` is None, the
+        default "media loudspeaker" image is used.
+        """
+        return cls(shapes, shape_id, movie_file, x, y, cx, cy, poster_frame_image, mime_type)._pic
+
+    @property
+    def _media_rId(self) -> str:
+        """Return the rId of RT.MEDIA relationship to video part.
+
+        For historical reasons, there are two relationships to the same part; one is the video rId
+        and the other is the media rId.
+        """
+        return self._video_part_rIds[0]
+
+    @lazyproperty
+    def _pic(self) -> CT_Picture:
+        """Return the new `p:pic` element referencing the video."""
+        return CT_Picture.new_video_pic(
+            self._shape_id,
+            self._shape_name,
+            self._video_rId,
+            self._media_rId,
+            self._poster_frame_rId,
+            self._x,
+            self._y,
+            self._cx,
+            self._cy,
+        )
+
+    @lazyproperty
+    def _poster_frame_image_file(self) -> str | IO[bytes]:
+        """Return the image file for video placeholder image.
+
+        If no poster frame file is provided, the default "media loudspeaker" image is used.
+        """
+        poster_frame_file = self._poster_frame_file
+        if poster_frame_file is None:
+            return io.BytesIO(SPEAKER_IMAGE_BYTES)
+        return poster_frame_file
+
+    @lazyproperty
+    def _poster_frame_rId(self) -> str:
+        """Return the rId of relationship to poster frame image.
+
+        The poster frame is the image used to represent the video before it's played.
+        """
+        _, poster_frame_rId = self._slide_part.get_or_add_image_part(self._poster_frame_image_file)
+        return poster_frame_rId
+
+    @property
+    def _shape_name(self) -> str:
+        """Return the appropriate shape name for the p:pic shape.
+
+        A movie shape is named with the base filename of the video.
+        """
+        return self._video.filename
+
+    @property
+    def _slide_part(self) -> SlidePart:
+        """Return SlidePart object for slide containing this movie."""
+        return self._shapes.part
+
+    @lazyproperty
+    def _video(self) -> Video:
+        """Return a |Video| object containing the movie file."""
+        return Video.from_path_or_file_like(self._movie_file, self._mime_type)
+
+    @lazyproperty
+    def _video_part_rIds(self) -> tuple[str, str]:
+        """Return the rIds for relationships to media part for video.
+
+        This is where the media part and its relationships to the slide are actually created.
+        """
+        media_rId, video_rId = self._slide_part.get_or_add_video_media_part(self._video)
+        return media_rId, video_rId
+
+    @property
+    def _video_rId(self) -> str:
+        """Return the rId of RT.VIDEO relationship to video part.
+
+        For historical reasons, there are two relationships to the same part; one is the video rId
+        and the other is the media rId.
+        """
+        return self._video_part_rIds[1]
+
+
+class _OleObjectElementCreator(object):
+    """Functional service object for creating a new OLE-object p:graphicFrame element.
+
+    It's entire external interface is its :meth:`graphicFrame` class method that returns a new
+    `p:graphicFrame` element containing the specified embedded OLE-object shape. This class is not
+    intended to be constructed or an instance of it retained by the caller; it is a "one-shot"
+    object, really a function wrapped in a object such that its helper methods can be organized
+    here.
+    """
+
+    def __init__(
+        self,
+        shapes: _BaseGroupShapes,
+        shape_id: int,
+        ole_object_file: str | IO[bytes],
+        prog_id: PROG_ID | str,
+        x: Length,
+        y: Length,
+        cx: Length | None,
+        cy: Length | None,
+        icon_file: str | IO[bytes] | None,
+        icon_width: Length | None,
+        icon_height: Length | None,
+    ):
+        self._shapes = shapes
+        self._shape_id = shape_id
+        self._ole_object_file = ole_object_file
+        self._prog_id_arg = prog_id
+        self._x = x
+        self._y = y
+        self._cx_arg = cx
+        self._cy_arg = cy
+        self._icon_file_arg = icon_file
+        self._icon_width_arg = icon_width
+        self._icon_height_arg = icon_height
+
+    @classmethod
+    def graphicFrame(
+        cls,
+        shapes: _BaseGroupShapes,
+        shape_id: int,
+        ole_object_file: str | IO[bytes],
+        prog_id: PROG_ID | str,
+        x: Length,
+        y: Length,
+        cx: Length | None,
+        cy: Length | None,
+        icon_file: str | IO[bytes] | None,
+        icon_width: Length | None,
+        icon_height: Length | None,
+    ) -> CT_GraphicalObjectFrame:
+        """Return new `p:graphicFrame` element containing embedded `ole_object_file`."""
+        return cls(
+            shapes,
+            shape_id,
+            ole_object_file,
+            prog_id,
+            x,
+            y,
+            cx,
+            cy,
+            icon_file,
+            icon_width,
+            icon_height,
+        )._graphicFrame
+
+    @lazyproperty
+    def _graphicFrame(self) -> CT_GraphicalObjectFrame:
+        """Newly-created `p:graphicFrame` element referencing embedded OLE-object."""
+        return CT_GraphicalObjectFrame.new_ole_object_graphicFrame(
+            self._shape_id,
+            self._shape_name,
+            self._ole_object_rId,
+            self._progId,
+            self._icon_rId,
+            self._x,
+            self._y,
+            self._cx,
+            self._cy,
+            self._icon_width,
+            self._icon_height,
+        )
+
+    @lazyproperty
+    def _cx(self) -> Length:
+        """Emu object specifying width of "show-as-icon" image for OLE shape."""
+        # --- a user-specified width overrides any default ---
+        if self._cx_arg is not None:
+            return self._cx_arg
+
+        # --- the default width is specified by the PROG_ID member if prog_id is one,
+        # --- otherwise it gets the default icon width.
+        return (
+            Emu(self._prog_id_arg.width) if isinstance(self._prog_id_arg, PROG_ID) else Emu(965200)
+        )
+
+    @lazyproperty
+    def _cy(self) -> Length:
+        """Emu object specifying height of "show-as-icon" image for OLE shape."""
+        # --- a user-specified width overrides any default ---
+        if self._cy_arg is not None:
+            return self._cy_arg
+
+        # --- the default height is specified by the PROG_ID member if prog_id is one,
+        # --- otherwise it gets the default icon height.
+        return (
+            Emu(self._prog_id_arg.height) if isinstance(self._prog_id_arg, PROG_ID) else Emu(609600)
+        )
+
+    @lazyproperty
+    def _icon_height(self) -> Length:
+        """Vertical size of enclosed EMF icon within the OLE graphic-frame.
+
+        This must be specified when a custom icon is used, to avoid stretching of the image and
+        possible undesired resizing by PowerPoint when the OLE shape is double-clicked to open it.
+
+        The correct size can be determined by creating an example PPTX using PowerPoint and then
+        inspecting the XML of the OLE graphics-frame (p:oleObj.imgH).
+        """
+        return self._icon_height_arg if self._icon_height_arg is not None else Emu(609600)
+
+    @lazyproperty
+    def _icon_image_file(self) -> str | IO[bytes]:
+        """Reference to image file containing icon to show in lieu of this object.
+
+        This can be either a str path or a file-like object (io.BytesIO typically).
+        """
+        # --- a user-specified icon overrides any default ---
+        if self._icon_file_arg is not None:
+            return self._icon_file_arg
+
+        # --- A prog_id belonging to PROG_ID gets its icon filename from there. A
+        # --- user-specified (str) prog_id gets the default icon.
+        icon_filename = (
+            self._prog_id_arg.icon_filename
+            if isinstance(self._prog_id_arg, PROG_ID)
+            else "generic-icon.emf"
+        )
+
+        _thisdir = os.path.split(__file__)[0]
+        return os.path.abspath(os.path.join(_thisdir, "..", "templates", icon_filename))
+
+    @lazyproperty
+    def _icon_rId(self) -> str:
+        """str rId like "rId7" of rel to icon (image) representing OLE-object part."""
+        _, rId = self._slide_part.get_or_add_image_part(self._icon_image_file)
+        return rId
+
+    @lazyproperty
+    def _icon_width(self) -> Length:
+        """Width of enclosed EMF icon within the OLE graphic-frame.
+
+        This must be specified when a custom icon is used, to avoid stretching of the image and
+        possible undesired resizing by PowerPoint when the OLE shape is double-clicked to open it.
+        """
+        return self._icon_width_arg if self._icon_width_arg is not None else Emu(965200)
+
+    @lazyproperty
+    def _ole_object_rId(self) -> str:
+        """str rId like "rId6" of relationship to embedded ole_object part.
+
+        This is where the ole_object part and its relationship to the slide are actually created.
+        """
+        return self._slide_part.add_embedded_ole_object_part(
+            self._prog_id_arg, self._ole_object_file
+        )
+
+    @lazyproperty
+    def _progId(self) -> str:
+        """str like "Excel.Sheet.12" identifying program used to open object.
+
+        This value appears in the `progId` attribute of the `p:oleObj` element for the object.
+        """
+        prog_id_arg = self._prog_id_arg
+
+        # --- member of PROG_ID enumeration knows its progId keyphrase, otherwise caller
+        # --- has specified it explicitly (as str)
+        return prog_id_arg.progId if isinstance(prog_id_arg, PROG_ID) else prog_id_arg
+
+    @lazyproperty
+    def _shape_name(self) -> str:
+        """str name like "Object 1" for the embedded ole_object shape.
+
+        The name is formed from the prefix "Object " and the shape-id decremented by 1.
+        """
+        return "Object %d" % (self._shape_id - 1)
+
+    @lazyproperty
+    def _slide_part(self) -> SlidePart:
+        """SlidePart object for this slide."""
+        return self._shapes.part