+ enum GraphicsType {
+ PdfGraphicsType,
+ PngGraphicsType,
+ JpegGraphicsType,
+ LinkBackGraphicsType,
+ EmfGraphicsType,
+ WmfGraphicsType,
+ AnyGraphicsType
+ };
+
+ /**
+ * Get the system clipboard contents. The format is as written in
+ * .lyx files (may even be an older version than ours if it comes
+ * from an older LyX).
+ * Does not convert plain text to LyX if only plain text is available.
+ * This should be called when the user requests to paste from the
+ * clipboard.
+ */
+ virtual std::string const getAsLyX() const = 0;
+ /// Get the contents of the window system clipboard in plain text format.
+ virtual docstring const getAsText() const = 0;
+ /// Get the contents of the window system clipboard as graphics file.
+ virtual FileName getAsGraphics(Cursor const & cur, GraphicsType type) const = 0;
+
+ /**
+ * Fill the system clipboard. The format of \p lyx is as written in
+ * .lyx files, the format of \p text is plain text.
+ * We put the clipboard contents in LyX format and plain text into
+ * the system clipboard if supported, so that it is useful for other
+ * applications as well as other instances of LyX.
+ * This should be called when the user requests to cut or copy to
+ * the clipboard.
+ */
+ virtual void put(std::string const & lyx, docstring const & text) = 0;
+
+ /// Does the clipboard contain LyX contents?
+ virtual bool hasLyXContents() const = 0;
+ /// Does the clipboard contain text contents?
+ virtual bool hasTextContents() const = 0;
+ /// Does the clipboard contain graphics contents of a certain type?
+ virtual bool hasGraphicsContents(GraphicsType type = AnyGraphicsType) const = 0;
+ /// state of clipboard.
+ /// \returns true if the system clipboard has been set within LyX
+ /// (document contents, dialogs count as external here).
+ virtual bool isInternal() const = 0;
+ /// \returns true if the OS has the concept of clipboard ownership,
+ /// which is crucial for our concept of internal clipboard.
+ virtual bool hasInternal() const = 0;
+ /// Is the clipboard empty?
+ /// \returns true if both the LyX and the plaintext versions of the
+ /// clipboard are empty, and no supported graphics format is available.
+ virtual bool empty() const = 0;