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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/* THIS IS A PUBLIC INTERFACE */
+
+interface nsIDOMNode;
+interface nsIDOMRange;
+interface nsINode;
+
+%{C++
+namespace mozilla {
+namespace dom {
+class Selection;
+} // namespace dom
+} // namespace mozilla
+%}
+
+/**
+ * Interface for manipulating and querying the current selected range
+ * of nodes within the document.
+ *
+ * @version 1.0
+ */
+
+[builtinclass, uuid(e0a4d4b3-f34e-44bd-b1f2-4e3bde9b6915)]
+interface nsISelection : nsISupports
+{
+ /**
+ * Returns the node in which the selection begins.
+ */
+ readonly attribute nsIDOMNode anchorNode;
+
+ /**
+ * The offset within the (text) node where the selection begins.
+ */
+ readonly attribute long anchorOffset;
+
+ /**
+ * Returns the node in which the selection ends.
+ */
+ readonly attribute nsIDOMNode focusNode;
+
+ /**
+ * The offset within the (text) node where the selection ends.
+ */
+ readonly attribute long focusOffset;
+
+ /**
+ * Indicates if the selection is collapsed or not.
+ */
+ readonly attribute boolean isCollapsed;
+ [noscript,notxpcom,nostdcall] boolean collapsed();
+
+ /**
+ * Returns the number of ranges in the selection.
+ */
+ readonly attribute long rangeCount;
+
+ /**
+ * Returns the range at the specified index.
+ */
+ nsIDOMRange getRangeAt(in long index);
+
+ /**
+ * Collapses the selection to a single point, at the specified offset
+ * in the given DOM node. When the selection is collapsed, and the content
+ * is focused and editable, the caret will blink there.
+ * @param parentNode The given dom node where the selection will be set
+ * @param offset Where in given dom node to place the selection (the offset into the given node)
+ */
+ void collapse(in nsIDOMNode parentNode, in long offset);
+ [noscript] void collapseNative(in nsINode parentNode, in long offset);
+
+ /**
+ * Extends the selection by moving the selection end to the specified node and offset,
+ * preserving the selection begin position. The new selection end result will always
+ * be from the anchorNode to the new focusNode, regardless of direction.
+ * @param parentNode The node where the selection will be extended to
+ * @param offset Where in node to place the offset in the new selection end
+ */
+ void extend(in nsIDOMNode parentNode, in long offset);
+ [noscript] void extendNative(in nsINode parentNode, in long offset);
+
+ /**
+ * Collapses the whole selection to a single point at the start
+ * of the current selection (irrespective of direction). If content
+ * is focused and editable, the caret will blink there.
+ */
+ void collapseToStart();
+
+ /**
+ * Collapses the whole selection to a single point at the end
+ * of the current selection (irrespective of direction). If content
+ * is focused and editable, the caret will blink there.
+ */
+ void collapseToEnd();
+
+ /**
+ * Indicates whether the node is part of the selection. If partlyContained
+ * is set to PR_TRUE, the function returns true when some part of the node
+ * is part of the selection. If partlyContained is set to PR_FALSE, the
+ * function only returns true when the entire node is part of the selection.
+ */
+ boolean containsNode(in nsIDOMNode node, in boolean partlyContained);
+
+ /**
+ * Adds all children of the specified node to the selection.
+ * @param parentNode the parent of the children to be added to the selection.
+ */
+ void selectAllChildren(in nsIDOMNode parentNode);
+
+ /**
+ * Adds a range to the current selection.
+ */
+ void addRange(in nsIDOMRange range);
+
+ /**
+ * Removes a range from the current selection.
+ */
+ void removeRange(in nsIDOMRange range);
+
+ /**
+ * Removes all ranges from the current selection.
+ */
+ void removeAllRanges();
+
+ /**
+ * Deletes this selection from document the nodes belong to.
+ */
+ void deleteFromDocument();
+
+ /**
+ * Returns the whole selection into a plain text string.
+ */
+ DOMString toString();
+
+ /**
+ * Modifies the selection. Note that the parameters are case-insensitive.
+ *
+ * @param alter can be one of { "move", "extend" }
+ * - "move" collapses the selection to the end of the selection and
+ * applies the movement direction/granularity to the collapsed
+ * selection.
+ * - "extend" leaves the start of the selection unchanged, and applies
+ * movement direction/granularity to the end of the selection.
+ * @param direction can be one of { "forward", "backward", "left", "right" }
+ * @param granularity can be one of { "character", "word",
+ * "line", "lineboundary" }
+ *
+ * @returns NS_ERROR_NOT_IMPLEMENTED if the granularity is "sentence",
+ * "sentenceboundary", "paragraph", "paragraphboundary", or
+ * "documentboundary". Returns NS_ERROR_INVALID_ARG if alter, direction,
+ * or granularity has an unrecognized value.
+ */
+ void modify(in DOMString alter, in DOMString direction,
+ in DOMString granularity);
+
+%{C++
+ /**
+ * AsSelection() returns a pointer to Selection class if the instance is
+ * derived from it. Otherwise, nullptr but it should never happen
+ * since Selection is the only class implementing nsISelection.
+ */
+ virtual mozilla::dom::Selection* AsSelection() = 0;
+%}
+};