QEMU UI subsystem
QEMU Clipboard
Introduction
The header ui/clipboard.h declares the qemu clipboard interface.
All qemu elements which want use the clipboard can register as clipboard peer. Subsequently they can set the clipboard content and get notifications for clipboard updates.
Typical users are user interfaces (gtk), remote access protocols (vnc) and devices talking to the guest (vdagent).
Even though the design allows different data types only plain text is supported for now.
- 
enum QemuClipboardType
Constants
- QEMU_CLIPBOARD_TYPE_TEXT
- text/plain; charset=utf-8 
- QEMU_CLIPBOARD_TYPE__COUNT
- type count. 
- 
enum QemuClipboardSelection
Constants
- QEMU_CLIPBOARD_SELECTION_CLIPBOARD
- clipboard (explitcit cut+paste). 
- QEMU_CLIPBOARD_SELECTION_PRIMARY
- primary selection (select + middle mouse button). 
- QEMU_CLIPBOARD_SELECTION_SECONDARY
- secondary selection (dunno). 
- QEMU_CLIPBOARD_SELECTION__COUNT
- selection count. 
- 
struct QemuClipboardPeer
Definition
struct QemuClipboardPeer {
  const char *name;
  Notifier notifier;
  void (*request)(QemuClipboardInfo *info, QemuClipboardType type);
};
Members
- name
- peer name. 
- notifier
- notifier for clipboard updates. 
- request
- callback for clipboard data requests. 
Description
Clipboard peer description.
- 
enum QemuClipboardNotifyType
Constants
- QEMU_CLIPBOARD_UPDATE_INFO
- clipboard info update 
- QEMU_CLIPBOARD_RESET_SERIAL
- reset clipboard serial 
Description
Clipboard notify type.
- 
struct QemuClipboardNotify
Definition
struct QemuClipboardNotify {
  QemuClipboardNotifyType type;
  union {
    QemuClipboardInfo *info;
  };
};
Members
- type
- the type of event. 
- {unnamed_union}
- anonymous 
- info
- a QemuClipboardInfo event. 
Description
Clipboard notify data.
- 
struct QemuClipboardInfo
Definition
struct QemuClipboardInfo {
  uint32_t refcount;
  QemuClipboardPeer *owner;
  QemuClipboardSelection selection;
  bool has_serial;
  uint32_t serial;
  struct {
    bool available;
    bool requested;
    size_t size;
    void *data;
  } types[QEMU_CLIPBOARD_TYPE__COUNT];
};
Members
- refcount
- reference counter. 
- owner
- clipboard owner. 
- selection
- clipboard selection. 
- has_serial
- whether serial is available. 
- serial
- the grab serial counter. 
- types
- clipboard data array (one entry per type). 
Description
Clipboard content data and metadata.
- 
void qemu_clipboard_peer_register(QemuClipboardPeer *peer)
Parameters
- QemuClipboardPeer *peer
- peer information. 
Description
Register clipboard peer. Registering is needed for both active (set+grab clipboard) and passive (watch clipboard for updates) interaction with the qemu clipboard.
- 
void qemu_clipboard_peer_unregister(QemuClipboardPeer *peer)
Parameters
- QemuClipboardPeer *peer
- peer information. 
Description
Unregister clipboard peer.
- 
bool qemu_clipboard_peer_owns(QemuClipboardPeer *peer, QemuClipboardSelection selection)
Parameters
- QemuClipboardPeer *peer
- peer information. 
- QemuClipboardSelection selection
- clipboard selection. 
Description
Return TRUE if the peer owns the clipboard.
- 
void qemu_clipboard_peer_release(QemuClipboardPeer *peer, QemuClipboardSelection selection)
Parameters
- QemuClipboardPeer *peer
- peer information. 
- QemuClipboardSelection selection
- clipboard selection. 
Description
If the peer owns the clipboard, release it.
- 
QemuClipboardInfo *qemu_clipboard_info(QemuClipboardSelection selection)
Parameters
- QemuClipboardSelection selection
- clipboard selection. 
Description
Return the current clipboard data & owner information.
- 
bool qemu_clipboard_check_serial(QemuClipboardInfo *info, bool client)
Parameters
- QemuClipboardInfo *info
- clipboard info. 
- bool client
- whether to check from the client context and priority. 
Description
Return TRUE if the info has a higher serial than the current clipboard.
- 
QemuClipboardInfo *qemu_clipboard_info_new(QemuClipboardPeer *owner, QemuClipboardSelection selection)
Parameters
- QemuClipboardPeer *owner
- clipboard owner. 
- QemuClipboardSelection selection
- clipboard selection. 
Description
Allocate a new QemuClipboardInfo and initialize it with the given owner and selection.
QemuClipboardInfo is a reference-counted struct. The new struct is returned with a reference already taken (i.e. reference count is one).
- 
QemuClipboardInfo *qemu_clipboard_info_ref(QemuClipboardInfo *info)
Parameters
- QemuClipboardInfo *info
- clipboard info. 
Description
Increase info reference count.
- 
void qemu_clipboard_info_unref(QemuClipboardInfo *info)
Parameters
- QemuClipboardInfo *info
- clipboard info. 
Description
Decrease info reference count. When the count goes down to zero free the info struct itself and all clipboard data.
- 
void qemu_clipboard_update(QemuClipboardInfo *info)
Parameters
- QemuClipboardInfo *info
- clipboard info. 
Description
Update the qemu clipboard. Notify all registered peers (including the clipboard owner) that the qemu clipboard has been updated.
This is used for both new completely clipboard content and for clipboard data updates in response to qemu_clipboard_request() calls.
- 
void qemu_clipboard_reset_serial(void)
Parameters
- void
- no arguments 
Description
Reset the clipboard serial.
- 
void qemu_clipboard_request(QemuClipboardInfo *info, QemuClipboardType type)
Parameters
- QemuClipboardInfo *info
- clipboard info. 
- QemuClipboardType type
- clipboard data type. 
Description
Request clipboard content. Typically the clipboard owner only advertises the available data types and provides the actual data only on request.
- 
void qemu_clipboard_set_data(QemuClipboardPeer *peer, QemuClipboardInfo *info, QemuClipboardType type, uint32_t size, const void *data, bool update)
Parameters
- QemuClipboardPeer *peer
- clipboard peer. 
- QemuClipboardInfo *info
- clipboard info. 
- QemuClipboardType type
- clipboard data type. 
- uint32_t size
- data size. 
- const void *data
- data blob. 
- bool update
- notify peers about the update. 
Description
Set clipboard content for the given type. This function will make a copy of the content data and store that.