plucky (3) wayland_server_pointer_t.3.gz
NAME
wayland::server::pointer_t - pointer input device
SYNOPSIS
#include <wayland-server-protocol.hpp>
Inherits wayland::server::resource_t.
Public Member Functions
std::function< void(uint32_t, surface_t, int32_t, int32_t)> & on_set_cursor ()
set the pointer surface
std::function< void()> & on_release ()
release the pointer object
void enter (uint32_t serial, surface_t const &surface, double surface_x, double surface_y, bool
post=true)
enter event
void leave (uint32_t serial, surface_t const &surface, bool post=true)
leave event
void motion (uint32_t time, double surface_x, double surface_y, bool post=true)
pointer motion event
void button (uint32_t serial, uint32_t time, uint32_t button, pointer_button_state const &state, bool
post=true)
pointer button event
void axis (uint32_t time, pointer_axis const &axis, double value, bool post=true)
axis event
void frame (bool post=true)
end of a pointer event sequence
bool can_frame () const
Check whether the frame function is available with the currently bound version of the protocol.
void axis_source (pointer_axis_source const &axis_source, bool post=true)
axis source event
bool can_axis_source () const
Check whether the axis_source function is available with the currently bound version of the protocol.
void axis_stop (uint32_t time, pointer_axis const &axis, bool post=true)
axis stop event
bool can_axis_stop () const
Check whether the axis_stop function is available with the currently bound version of the protocol.
void axis_discrete (pointer_axis const &axis, int32_t discrete, bool post=true)
axis click event
bool can_axis_discrete () const
Check whether the axis_discrete function is available with the currently bound version of the
protocol.
void axis_value120 (pointer_axis const &axis, int32_t value120, bool post=true)
axis high-resolution scroll event
bool can_axis_value120 () const
Check whether the axis_value120 function is available with the currently bound version of the
protocol.
void post_role (std::string const &msg)
Post error: given wl_surface has another role.
bool proxy_has_object () const
Check whether this wrapper actually wraps an object.
void post_no_memory () const
uint32_t get_id () const
client_t get_client () const
unsigned int get_version () const
std::string get_class ()
Static Public Attributes
static constexpr std::uint32_t enter_since_version = 1
Minimum protocol version required for the enter function.
static constexpr std::uint32_t leave_since_version = 1
Minimum protocol version required for the leave function.
static constexpr std::uint32_t motion_since_version = 1
Minimum protocol version required for the motion function.
static constexpr std::uint32_t button_since_version = 1
Minimum protocol version required for the button function.
static constexpr std::uint32_t axis_since_version = 1
Minimum protocol version required for the axis function.
static constexpr std::uint32_t frame_since_version = 5
Minimum protocol version required for the frame function.
static constexpr std::uint32_t axis_source_since_version = 5
Minimum protocol version required for the axis_source function.
static constexpr std::uint32_t axis_stop_since_version = 5
Minimum protocol version required for the axis_stop function.
static constexpr std::uint32_t axis_discrete_since_version = 5
Minimum protocol version required for the axis_discrete function.
static constexpr std::uint32_t axis_value120_since_version = 8
Minimum protocol version required for the axis_value120 function.
Detailed Description
pointer input device
The wl_pointer interface represents one or more input devices, such as mice, which control the pointer
location and pointer_focus of a seat.
The wl_pointer interface generates motion, enter and leave events for the surfaces that the pointer is
located over, and button and axis events for button presses, button releases and scrolling.
Definition at line 2809 of file wayland-server-protocol.hpp.
Member Function Documentation
void pointer_t::axis (uint32_t time, pointer_axis const & axis, double value, bool post = true)
axis event
Parameters
time timestamp with millisecond granularity
axis axis type
value length of vector in surface-local coordinate space
Scroll and other axis notifications.
For scroll events (vertical and horizontal scroll axes), the value parameter is the length of a vector
along the specified axis in a coordinate space identical to those of motion events, representing a
relative movement along the specified axis.
For devices that support movements non-parallel to axes multiple axis events will be emitted.
When applicable, for example for touch pads, the server can choose to emit scroll events where the motion
vector is equivalent to a motion event vector.
When applicable, a client can transform its content relative to the scroll distance.
Definition at line 2688 of file wayland-server-protocol.cpp.
void pointer_t::axis_discrete (pointer_axis const & axis, int32_t discrete, bool post = true)
axis click event
Parameters
axis axis type
discrete number of steps
Discrete step information for scroll and other axes.
This event carries the axis value of the wl_pointer.axis event in discrete steps (e.g. mouse wheel
clicks).
This event is deprecated with wl_pointer version 8 - this event is not sent to clients supporting version
8 or later.
This event does not occur on its own, it is coupled with a wl_pointer.axis event that represents this
axis value on a continuous scale. The protocol guarantees that each axis_discrete event is always
followed by exactly one axis event with the same axis number within the same wl_pointer.frame. Note that
the protocol allows for other events to occur between the axis_discrete and its coupled axis event,
including other axis_discrete or axis events.
This event is optional; continuous scrolling devices like two-finger scrolling on touchpads do not have
discrete steps and do not generate this event.
The discrete value carries the directional information. e.g. a value of -2 is two steps towards the
negative direction of this axis.
The axis number is identical to the axis number in the associated axis event.
The order of wl_pointer.axis_discrete and wl_pointer.axis_source is not guaranteed.
Definition at line 2723 of file wayland-server-protocol.cpp.
void pointer_t::axis_source (pointer_axis_source const & axis_source, bool post = true)
axis source event
Parameters
axis_source source of the axis event
Source information for scroll and other axes.
This event does not occur on its own. It is sent before a wl_pointer.frame event and carries the source
information for all events within that frame.
The source specifies how this event was generated. If the source is wl_pointer.axis_source.finger, a
wl_pointer.axis_stop event will be sent when the user lifts the finger off the device.
If the source is wl_pointer.axis_source.wheel, wl_pointer.axis_source.wheel_tilt or
wl_pointer.axis_source.continuous, a wl_pointer.axis_stop event may or may not be sent. Whether a
compositor sends an axis_stop event for these sources is hardware-specific and implementation-dependent;
clients must not rely on receiving an axis_stop event for these scroll sources and should treat scroll
sequences from these scroll sources as unterminated by default.
This event is optional. If the source is unknown for a particular axis event sequence, no event is sent.
Only one wl_pointer.axis_source event is permitted per frame.
The order of wl_pointer.axis_discrete and wl_pointer.axis_source is not guaranteed.
Definition at line 2703 of file wayland-server-protocol.cpp.
void pointer_t::axis_stop (uint32_t time, pointer_axis const & axis, bool post = true)
axis stop event
Parameters
time timestamp with millisecond granularity
axis the axis stopped with this event
Stop notification for scroll and other axes.
For some wl_pointer.axis_source types, a wl_pointer.axis_stop event is sent to notify a client that the
axis sequence has terminated. This enables the client to implement kinetic scrolling. See the
wl_pointer.axis_source documentation for information on when this event may be generated.
Any wl_pointer.axis events with the same axis_source after this event should be considered as the start
of a new axis motion.
The timestamp is to be interpreted identical to the timestamp in the wl_pointer.axis event. The timestamp
value may be the same as a preceding wl_pointer.axis event.
Definition at line 2713 of file wayland-server-protocol.cpp.
void pointer_t::axis_value120 (pointer_axis const & axis, int32_t value120, bool post = true)
axis high-resolution scroll event
Parameters
axis axis type
value120 scroll distance as fraction of 120
Discrete high-resolution scroll information.
This event carries high-resolution wheel scroll information, with each multiple of 120 representing one
logical scroll step (a wheel detent). For example, an axis_value120 of 30 is one quarter of a logical
scroll step in the positive direction, a value120 of -240 are two logical scroll steps in the negative
direction within the same hardware event. Clients that rely on discrete scrolling should accumulate the
value120 to multiples of 120 before processing the event.
The value120 must not be zero.
This event replaces the wl_pointer.axis_discrete event in clients supporting wl_pointer version 8 or
later.
Where a wl_pointer.axis_source event occurs in the same wl_pointer.frame, the axis source applies to this
event.
The order of wl_pointer.axis_value120 and wl_pointer.axis_source is not guaranteed.
Definition at line 2733 of file wayland-server-protocol.cpp.
void pointer_t::button (uint32_t serial, uint32_t time, uint32_t button, pointer_button_state const & state,
bool post = true)
pointer button event
Parameters
serial serial number of the button event
time timestamp with millisecond granularity
button button that produced the event
state physical state of the button
Mouse button click and release notifications.
The location of the click is given by the last motion or enter event. The time argument is a timestamp
with millisecond granularity, with an undefined base.
The button is a button code as defined in the Linux kernel's linux/input-event-codes.h header file, e.g.
BTN_LEFT.
Any 16-bit button code value is reserved for future additions to the kernel's event code list. All other
button codes above 0xFFFF are currently undefined but may be used in future versions of this protocol.
Definition at line 2683 of file wayland-server-protocol.cpp.
bool pointer_t::can_axis_discrete () const
Check whether the axis_discrete function is available with the currently bound version of the protocol.
Definition at line 2728 of file wayland-server-protocol.cpp.
bool pointer_t::can_axis_source () const
Check whether the axis_source function is available with the currently bound version of the protocol.
Definition at line 2708 of file wayland-server-protocol.cpp.
bool pointer_t::can_axis_stop () const
Check whether the axis_stop function is available with the currently bound version of the protocol.
Definition at line 2718 of file wayland-server-protocol.cpp.
bool pointer_t::can_axis_value120 () const
Check whether the axis_value120 function is available with the currently bound version of the protocol.
Definition at line 2738 of file wayland-server-protocol.cpp.
bool pointer_t::can_frame () const
Check whether the frame function is available with the currently bound version of the protocol.
Definition at line 2698 of file wayland-server-protocol.cpp.
void pointer_t::enter (uint32_t serial, surface_t const & surface, double surface_x, double surface_y, bool
post = true)
enter event
Parameters
serial serial number of the enter event
surface surface entered by the pointer
surface_x surface-local x coordinate
surface_y surface-local y coordinate
Notification that this seat's pointer is focused on a certain surface.
When a seat's focus enters a surface, the pointer image is undefined and a client should respond to this
event by setting an appropriate pointer image with the set_cursor request.
Definition at line 2668 of file wayland-server-protocol.cpp.
void pointer_t::frame (bool post = true)
end of a pointer event sequence Indicates the end of a set of events that logically belong together. A
client is expected to accumulate the data in all events within the frame before proceeding.
All wl_pointer events before a wl_pointer.frame event belong logically together. For example, in a
diagonal scroll motion the compositor will send an optional wl_pointer.axis_source event, two
wl_pointer.axis events (horizontal and vertical) and finally a wl_pointer.frame event. The client may use
this information to calculate a diagonal vector for scrolling.
When multiple wl_pointer.axis events occur within the same frame, the motion vector is the combined
motion of all events. When a wl_pointer.axis and a wl_pointer.axis_stop event occur within the same
frame, this indicates that axis movement in one axis has stopped but continues in the other axis. When
multiple wl_pointer.axis_stop events occur within the same frame, this indicates that these axes stopped
in the same instance.
A wl_pointer.frame event is sent for every logical event group, even if the group only contains a single
wl_pointer event. Specifically, a client may get a sequence: motion, frame, button, frame, axis, frame,
axis_stop, frame.
The wl_pointer.enter and wl_pointer.leave events are logical events generated by the compositor and not
the hardware. These events are also grouped by a wl_pointer.frame. When a pointer moves from one surface
to another, a compositor should group the wl_pointer.leave event within the same wl_pointer.frame.
However, a client must not rely on wl_pointer.leave and wl_pointer.enter being in the same
wl_pointer.frame. Compositor-specific policies may require the wl_pointer.leave and wl_pointer.enter
event being split across multiple wl_pointer.frame groups.
Definition at line 2693 of file wayland-server-protocol.cpp.
std::string wayland::server::resource_t::get_class () [inherited]
Retrieve the interface name (class) of a resource object.
Returns
Interface name of the resource object.
client_t wayland::server::resource_t::get_client () const [inherited]
Get the associated client
Returns
the client that owns the resource.
uint32_t wayland::server::resource_t::get_id () const [inherited]
Get the internal ID of the resource
Returns
the internal ID of the resource
unsigned int wayland::server::resource_t::get_version () const [inherited]
Get interface version
Returns
Interface version this resource has been constructed with.
void pointer_t::leave (uint32_t serial, surface_t const & surface, bool post = true)
leave event
Parameters
serial serial number of the leave event
surface surface left by the pointer
Notification that this seat's pointer is no longer focused on a certain surface.
The leave notification is sent before the enter notification for the new focus.
Definition at line 2673 of file wayland-server-protocol.cpp.
void pointer_t::motion (uint32_t time, double surface_x, double surface_y, bool post = true)
pointer motion event
Parameters
time timestamp with millisecond granularity
surface_x surface-local x coordinate
surface_y surface-local y coordinate
Notification of pointer location change. The arguments surface_x and surface_y are the location relative
to the focused surface.
Definition at line 2678 of file wayland-server-protocol.cpp.
std::function< void()> & pointer_t::on_release ()
release the pointer object Using this request a client can tell the server that it is not going to use
the pointer object anymore.
This request destroys the pointer proxy object, so clients must not call wl_pointer_destroy() after using
this request.
Definition at line 2662 of file wayland-server-protocol.cpp.
std::function< void(uint32_t, surface_t, int32_t, int32_t)> & pointer_t::on_set_cursor ()
set the pointer surface
Parameters
serial serial number of the enter event
surface pointer surface
hotspot_x surface-local x coordinate
hotspot_y surface-local y coordinate
Set the pointer surface, i.e., the surface that contains the pointer image (cursor). This request gives
the surface the role of a cursor. If the surface already has another role, it raises a protocol error.
The cursor actually changes only if the pointer focus for this device is one of the requesting client's
surfaces or the surface parameter is the current pointer surface. If there was a previous surface set
with this request it is replaced. If surface is NULL, the pointer image is hidden.
The parameters hotspot_x and hotspot_y define the position of the pointer surface relative to the pointer
location. Its top-left corner is always at (x, y) - (hotspot_x, hotspot_y), where (x, y) are the
coordinates of the pointer location, in surface-local coordinates.
On surface.attach requests to the pointer surface, hotspot_x and hotspot_y are decremented by the x and y
parameters passed to the request. Attach must be confirmed by wl_surface.commit as usual.
The hotspot can also be updated by passing the currently set pointer surface to this request with new
values for hotspot_x and hotspot_y.
The current and pending input regions of the wl_surface are cleared, and wl_surface.set_input_region is
ignored until the wl_surface is no longer used as the cursor. When the use as a cursor ends, the current
and pending input regions become undefined, and the wl_surface is unmapped.
The serial parameter must match the latest wl_pointer.enter serial number sent to the client. Otherwise
the request will be ignored.
Definition at line 2656 of file wayland-server-protocol.cpp.
void wayland::server::resource_t::post_no_memory () const [inherited]
Post 'not enough memory' error to the client
If the compositor has not enough memory to fulfill a certail request of the client, this function can be
called to notify the client of this circumstance.
void pointer_t::post_role (std::string const & msg)
Post error: given wl_surface has another role.
Definition at line 2743 of file wayland-server-protocol.cpp.
bool wayland::server::resource_t::proxy_has_object () const [inherited]
Check whether this wrapper actually wraps an object.
Returns
true if there is an underlying object, false if this wrapper is empty
Member Data Documentation
constexpr std::uint32_t wayland::server::pointer_t::axis_discrete_since_version = 5 [static], [constexpr]
Minimum protocol version required for the axis_discrete function.
Definition at line 3162 of file wayland-server-protocol.hpp.
constexpr std::uint32_t wayland::server::pointer_t::axis_since_version = 1 [static], [constexpr]
Minimum protocol version required for the axis function.
Definition at line 3000 of file wayland-server-protocol.hpp.
constexpr std::uint32_t wayland::server::pointer_t::axis_source_since_version = 5 [static], [constexpr]
Minimum protocol version required for the axis_source function.
Definition at line 3085 of file wayland-server-protocol.hpp.
constexpr std::uint32_t wayland::server::pointer_t::axis_stop_since_version = 5 [static], [constexpr]
Minimum protocol version required for the axis_stop function.
Definition at line 3116 of file wayland-server-protocol.hpp.
constexpr std::uint32_t wayland::server::pointer_t::axis_value120_since_version = 8 [static], [constexpr]
Minimum protocol version required for the axis_value120 function.
Definition at line 3200 of file wayland-server-protocol.hpp.
constexpr std::uint32_t wayland::server::pointer_t::button_since_version = 1 [static], [constexpr]
Minimum protocol version required for the button function.
Definition at line 2971 of file wayland-server-protocol.hpp.
constexpr std::uint32_t wayland::server::pointer_t::enter_since_version = 1 [static], [constexpr]
Minimum protocol version required for the enter function.
Definition at line 2910 of file wayland-server-protocol.hpp.
constexpr std::uint32_t wayland::server::pointer_t::frame_since_version = 5 [static], [constexpr]
Minimum protocol version required for the frame function.
Definition at line 3044 of file wayland-server-protocol.hpp.
constexpr std::uint32_t wayland::server::pointer_t::leave_since_version = 1 [static], [constexpr]
Minimum protocol version required for the leave function.
Definition at line 2927 of file wayland-server-protocol.hpp.
constexpr std::uint32_t wayland::server::pointer_t::motion_since_version = 1 [static], [constexpr]
Minimum protocol version required for the motion function.
Definition at line 2943 of file wayland-server-protocol.hpp.
Author
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