Provided by: waylandpp-dev_1.0.0-3_amd64 
NAME
wayland::zwp_pointer_gesture_pinch_v1_t - a pinch gesture object
SYNOPSIS
#include <wayland-client-protocol-unstable.hpp>
Inherits wayland::proxy_t.
Public Types
enum class wrapper_type { standard, display, foreign, proxy_wrapper }
Public Member Functions
std::function< void(uint32_t, uint32_t, surface_t, uint32_t)> & on_begin ()
multi-finger pinch begin
std::function< void(uint32_t, double, double, double, double)> & on_update ()
multi-finger pinch motion
std::function< void(uint32_t, uint32_t, int32_t)> & on_end ()
multi-finger pinch end
uint32_t get_id () const
Get the id of a proxy object.
std::string get_class () const
Get the interface name (class) of a proxy object.
uint32_t get_version () const
Get the protocol object version of a proxy object.
wrapper_type get_wrapper_type () const
Get the type of a proxy object.
void set_queue (event_queue_t queue)
Assign a proxy to an event queue.
wl_proxy * c_ptr () const
Get a pointer to the underlying C struct.
bool proxy_has_object () const
Check whether this wrapper actually wraps an object.
operator bool () const
Check whether this wrapper actually wraps an object.
bool operator== (const proxy_t &right) const
Check whether two wrappers refer to the same object.
bool operator!= (const proxy_t &right) const
Check whether two wrappers refer to different objects.
void proxy_release ()
Release the wrapped object (if any), making this an empty wrapper.
Detailed Description
a pinch gesture object
A pinch gesture object notifies a client about a multi-finger pinch gesture detected on an
indirect input device such as a touchpad. The gesture is usually initiated by multiple
fingers moving towards each other or away from each other, or by two or more fingers
rotating around a logical center of gravity. The precise conditions of when such a gesture
is detected are implementation-dependent.
A gesture consists of three stages: begin, update (optional) and end. There cannot be
multiple simultaneous hold, pinch or swipe gestures on a same pointer/seat, how
compositors prevent these situations is implementation-dependent.
A gesture may be cancelled by the compositor or the hardware. Clients should not consider
performing permanent or irreversible actions until the end of a gesture has been received.
Definition at line 3003 of file wayland-client-protocol-unstable.hpp.
Member Enumeration Documentation
enum wayland::proxy_t::wrapper_type [strong], [inherited]
Underlying wl_proxy type and properties of a proxy_t that affect construction,
destruction, and event handling
Enumerator
standard
C pointer is a standard type compatible with wl_proxy*. Events are dispatched and
it is destructed when the proxy_t is destructed. User data is set.
display
C pointer is a wl_display*. No events are dispatched, wl_display_disconnect is
called when the proxy_t is destructed. User data is set.
foreign
C pointer is a standard type compatible with wl_proxy*, but another library owns it
and it should not be touched in a way that could affect the operation of the other
library. No events are dispatched, wl_proxy_destroy is not called when the proxy_t
is destructed, user data is not touched. Consequently, there is no reference
counting for the proxy_t. Lifetime of such wrappers should preferably be short to
minimize the chance that the owning library decides to destroy the wl_proxy.
proxy_wrapper
C pointer is a wl_proxy* that was constructed with wl_proxy_create_wrapper. No
events are dispatched, wl_proxy_wrapper_destroy is called when the proxy_t is
destroyed. Reference counting is active. A reference to the proxy_t creating this
proxy wrapper is held to extend its lifetime until after the proxy wrapper is
destroyed.
Definition at line 115 of file wayland-client.hpp.
Member Function Documentation
wl_proxy* wayland::proxy_t::c_ptr () const [inherited]
Get a pointer to the underlying C struct.
Returns
The underlying wl_proxy wrapped by this proxy_t if it exists, otherwise an exception
is thrown
std::string wayland::proxy_t::get_class () const [inherited]
Get the interface name (class) of a proxy object.
Returns
The interface name of the object associated with the proxy
uint32_t wayland::proxy_t::get_id () const [inherited]
Get the id of a proxy object.
Returns
The id the object associated with the proxy
uint32_t wayland::proxy_t::get_version () const [inherited]
Get the protocol object version of a proxy object. Gets the protocol object version of a
proxy object, or 0 if the proxy was created with unversioned API.
A returned value of 0 means that no version information is available, so the caller must
make safe assumptions about the object's real version.
display_t will always return version 0.
Returns
The protocol object version of the proxy or 0
wrapper_type wayland::proxy_t::get_wrapper_type () const [inline], [inherited]
Get the type of a proxy object.
Definition at line 301 of file wayland-client.hpp.
std::function< void(uint32_t, uint32_t, surface_t, uint32_t)> &
zwp_pointer_gesture_pinch_v1_t::on_begin ()
multi-finger pinch begin
Parameters
serial
time timestamp with millisecond granularity
surface
fingers number of fingers
This event is sent when a multi-finger pinch gesture is detected on the device.
Definition at line 6172 of file wayland-client-protocol-unstable.cpp.
std::function< void(uint32_t, uint32_t, int32_t)> & zwp_pointer_gesture_pinch_v1_t::on_end ()
multi-finger pinch end
Parameters
serial
time timestamp with millisecond granularity
cancelled 1 if the gesture was cancelled, 0 otherwise
This event is sent when a multi-finger pinch gesture ceases to be valid. This may happen
when one or more fingers are lifted or the gesture is cancelled.
When a gesture is cancelled, the client should undo state changes caused by this gesture.
What causes a gesture to be cancelled is implementation-dependent.
Definition at line 6182 of file wayland-client-protocol-unstable.cpp.
std::function< void(uint32_t, double, double, double, double)> &
zwp_pointer_gesture_pinch_v1_t::on_update ()
multi-finger pinch motion
Parameters
time timestamp with millisecond granularity
dx delta x coordinate in surface coordinate space
dy delta y coordinate in surface coordinate space
scale scale relative to the initial finger position
rotation angle in degrees cw relative to the previous event
This event is sent when a multi-finger pinch gesture changes the position of the logical
center, the rotation or the relative scale.
The dx and dy coordinates are relative coordinates in the surface coordinate space of the
logical center of the gesture.
The scale factor is an absolute scale compared to the pointer_gesture_pinch.begin event,
e.g. a scale of 2 means the fingers are now twice as far apart as on
pointer_gesture_pinch.begin.
The rotation is the relative angle in degrees clockwise compared to the previous
pointer_gesture_pinch.begin or pointer_gesture_pinch.update event.
Definition at line 6177 of file wayland-client-protocol-unstable.cpp.
wayland::proxy_t::operator bool () const [inherited]
Check whether this wrapper actually wraps an object.
Returns
true if there is an underlying object, false if this wrapper is empty
bool wayland::proxy_t::operator!= (const proxy_t & right) const [inherited]
Check whether two wrappers refer to different objects.
bool wayland::proxy_t::operator== (const proxy_t & right) const [inherited]
Check whether two wrappers refer to the same object.
bool wayland::proxy_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
void wayland::proxy_t::proxy_release () [inherited]
Release the wrapped object (if any), making this an empty wrapper. Note that display_t
instances cannot be released this way. Attempts to do so are ignored.
void wayland::proxy_t::set_queue (event_queue_t queue) [inherited]
Assign a proxy to an event queue.
Parameters
queue The event queue that will handle this proxy
Assign proxy to event queue. Events coming from proxy will be queued in queue instead of
the display's main queue.
See also: display_t::dispatch_queue().
Author
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Version 1.0.0 Tue May 17 202wayland::zwp_pointer_gesture_pinch_v1_t(3)