#GtkEventControllerScroll is an event controller meant to handle
scroll events from mice and touchpads. It is capable of handling
both discrete and continuous scroll events, abstracting them both
on the #GtkEventControllerScroll::scroll signal (deltas in the
discrete case are multiples of 1).
In the case of continuous scroll events, #GtkEventControllerScroll
encloses all #GtkEventControllerScroll::scroll events between two
#GtkEventControllerScroll::scroll-begin and #GtkEventControllerScroll::scroll-end
signals.
The behavior of the event controller can be modified by the
flags given at creation time, or modified at a later point through
gtk.event_controller_scroll.EventControllerScroll.setFlags (e.g. because the scrolling
conditions of the widget changed).
The controller can be set up to emit motion for either/both vertical
and horizontal scroll events through #GTK_EVENT_CONTROLLER_SCROLL_VERTICAL,
#GTK_EVENT_CONTROLLER_SCROLL_HORIZONTAL and #GTK_EVENT_CONTROLLER_SCROLL_BOTH.
If any axis is disabled, the respective #GtkEventControllerScroll::scroll
delta will be 0. Vertical scroll events will be translated to horizontal
motion for the devices incapable of horizontal scrolling.
The event controller can also be forced to emit discrete events on all devices
through #GTK_EVENT_CONTROLLER_SCROLL_DISCRETE. This can be used to implement
discrete actions triggered through scroll events (e.g. switching across
combobox options).
The #GTK_EVENT_CONTROLLER_SCROLL_KINETIC flag toggles the emission of the
#GtkEventControllerScroll::decelerate signal, emitted at the end of scrolling
with two X/Y velocity arguments that are consistent with the motion that
was received.
#GtkEventControllerScroll is an event controller meant to handle scroll events from mice and touchpads. It is capable of handling both discrete and continuous scroll events, abstracting them both on the #GtkEventControllerScroll::scroll signal (deltas in the discrete case are multiples of 1).
In the case of continuous scroll events, #GtkEventControllerScroll encloses all #GtkEventControllerScroll::scroll events between two #GtkEventControllerScroll::scroll-begin and #GtkEventControllerScroll::scroll-end signals.
The behavior of the event controller can be modified by the flags given at creation time, or modified at a later point through gtk.event_controller_scroll.EventControllerScroll.setFlags (e.g. because the scrolling conditions of the widget changed).
The controller can be set up to emit motion for either/both vertical and horizontal scroll events through #GTK_EVENT_CONTROLLER_SCROLL_VERTICAL, #GTK_EVENT_CONTROLLER_SCROLL_HORIZONTAL and #GTK_EVENT_CONTROLLER_SCROLL_BOTH. If any axis is disabled, the respective #GtkEventControllerScroll::scroll delta will be 0. Vertical scroll events will be translated to horizontal motion for the devices incapable of horizontal scrolling.
The event controller can also be forced to emit discrete events on all devices through #GTK_EVENT_CONTROLLER_SCROLL_DISCRETE. This can be used to implement discrete actions triggered through scroll events (e.g. switching across combobox options).
The #GTK_EVENT_CONTROLLER_SCROLL_KINETIC flag toggles the emission of the #GtkEventControllerScroll::decelerate signal, emitted at the end of scrolling with two X/Y velocity arguments that are consistent with the motion that was received.
This object was added in 3.24.