Gnome::Gdk4::Event

Description§

Represents windowing system events.

In GTK applications the events are handled automatically by toplevel widgets and passed on to the event controllers of appropriate widgets, so using Gnome::Gdk4::Event and its related API is rarely needed.

Gnome::Gdk4::Event structs are immutable.

Class initialization§

new§

:native-object§

Create an object using a native object from an object of the same type found elsewhere. See also Gnome::N::TopLevelSupportClass.

multi method new ( N-Object() :$native-object! )

Methods§

-get-angle§

Returns the relative angle from $event1 to $event2.

The relative angle is the angle between the X axis and the line through both events' positions. The rotation direction for positive angles is from the positive X axis towards the positive Y axis.

This assumes that both events have X/Y information. If not, this function returns False.

method -get-angle ( N-Object() $event2, Num() $angle --> Bool )

• $event2; second Gnome::Gdk4::Event.
• $angle; (transfer ownership: full) return location for the relative angle between both events.

Return value; True if the angle could be calculated..

-get-center§

Returns the point halfway between the events' positions.

This assumes that both events have X/Y information. If not, this function returns False.

method -get-center ( N-Object() $event2, Num() $x, Num() $y --> Bool )

• $event2; second Gnome::Gdk4::Event.
• $x; (transfer ownership: full) return location for the X coordinate of the center.
• $y; (transfer ownership: full) return location for the Y coordinate of the center.

Return value; True if the center could be calculated..

-get-distance§

Returns the distance between the event locations.

This assumes that both events have X/Y information. If not, this function returns False.

method -get-distance ( N-Object() $event2, Num() $distance --> Bool )

• $event2; second Gnome::Gdk4::Event.
• $distance; (transfer ownership: full) return location for the distance.

Return value; True if the distance could be calculated..

get-axes§

Extracts all axis values from an event.

To find out which axes are used, use .get-axes() in class Gnome on the device tool returned by .get-device-tool().

method get-axes ( Num() $axes, Array[Int] $n-axes --> Bool )

• $axes; the array of values for all axes.
• $n-axes; (transfer ownership: full) the length of array.

Return value; True on success, otherwise False.

get-axis§

Extract the axis value for a particular axis use from an event structure.

To find out which axes are used, use .get-axes() in class Gnome on the device tool returned by .get-device-tool().

method get-axis ( GdkAxisUse $axis-use, Num() $value --> Bool )

• $axis-use; the axis use to look for.
• $value; (transfer ownership: full) location to store the value found.

Return value; True if the specified axis was found, otherwise False.

get-device§

Returns the device of an event.

method get-device (--> N-Object )

Return value; a Gnome::Gdk4::Device.

get-device-tool§

Returns a Gnome::Gdk4::DeviceTool representing the tool that caused the event.

If the was not generated by a device that supports different tools (such as a tablet), this function will return undefined.

Note: the Gnome::Gdk4::DeviceTool will be constant during the application lifetime, if settings must be stored persistently across runs, see .get-serial() in class Gnome.

method get-device-tool (--> N-Object )

Return value; The current device tool.

get-display§

Retrieves the display associated to the $event.

method get-display (--> N-Object )

Return value; a Gnome::Gdk4::Display.

get-event-sequence§

Returns the event sequence to which the event belongs.

Related touch events are connected in a sequence. Other events typically don't have event sequence information.

method get-event-sequence (--> N-Object )

Return value; the event sequence that the event belongs to.

get-event-type This function is not yet available§

Retrieves the type of the event.

method get-event-type (--> GdkEventType  )

Return value; a Gnome::Gdk4::EventType.

get-history§

Retrieves the history of the device that $event is for, as a list of time and coordinates.

The history includes positions that are not delivered as separate events to the application because they occurred in the same frame as $event.

Note that only motion and scroll events record history, and motion events do it only if one of the mouse buttons is down, or the device has a tool.

method get-history ( Array[Int] $out-n-coords --> N-Object )

• $out-n-coords; (transfer ownership: full) Return location for the length of the returned array.

Return value; an array of time and coordinates.

get-modifier-state§

Returns the modifier state field of an event.

method get-modifier-state (--> UInt )

Return value; the modifier state of $event.

get-pointer-emulated§

Returns whether this event is an 'emulated' pointer event.

Emulated pointer events typically originate from a touch events.

method get-pointer-emulated (--> Bool )

Return value; True if this event is emulated.

get-position§

Extract the event surface relative x/y coordinates from an event.

This position is in [surface coordinates](coordinates.html).

method get-position ( Num() $x, Num() $y --> Bool )

• $x; (transfer ownership: full) location to put event surface x coordinate.
• $y; (transfer ownership: full) location to put event surface y coordinate.

Return value; whether the positions were set.

get-seat§

Returns the seat that originated the event.

method get-seat (--> N-Object )

Return value; a Gnome::Gdk4::Seat..

get-surface§

Extracts the surface associated with an event.

method get-surface (--> N-Object )

Return value; The Gnome::Gdk4::Surface associated with the event.

get-time§

Returns the timestamp of $event.

Not all events have timestamps. In that case, this function returns GDK_CURRENT_TIME.

method get-time (--> UInt )

Return value; timestamp field from $event.

ref§

Increase the ref count of $event.

method ref (--> N-Object )

Return value; $event.

triggers-context-menu§

Returns whether a Gnome::Gdk4::Event should trigger a context menu, according to platform conventions.

The right mouse button typically triggers context menus. On macOS, Control+left mouse button also triggers.

This function should always be used instead of simply checking for

method triggers-context-menu (--> Bool )

Return value; True if the event should trigger a context menu..

unref§

Decrease the ref count of $event.

If the last reference is dropped, the structure is freed.

method unref ( )