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gdk/events: Add constructor for high-resolution scroll events

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Starting with Linux Kernel v5.0 two new axes are available for
mice that support high-resolution wheel scrolling: REL_WHEEL_HI_RES and
REL_HWHEEL_HI_RES.

Both axes send data in fractions of 120 where each multiple of 120
amounts to one logical scroll event. Fractions of 120 indicate a wheel
movement less than one detent.

The 120 magic number is a copy of the Windows API, so this new
constructor can be used both in Linux >= 5.0 and Windows >= Vista.
This commit is contained in:
José Expósito 2021-09-20 19:59:35 +02:00 committed by Carlos Garnacho
parent fb100d719f
commit 51ca454eef
2 changed files with 51 additions and 0 deletions
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42
gdk/gdkevents.c
View File

@ -2377,6 +2377,48 @@ gdk_scroll_event_new_discrete (GdkSurface *surface,
return (GdkEvent *) self;
}
/*< private >
* gtk_scroll_event_new_value120:
* @surface: the `GdkSurface` of the event
* @device: the `GdkDevice` of the event
* @tool: (nullable): the tool that generated to event
* @time: the event serial
* @state: Flags to indicate the state of modifier keys and mouse buttons
* in events.
* @direction: scroll direction.
* @delta_x: delta on the X axis in the 120.0 scale
* @delta_x: delta on the Y axis in the 120.0 scale
*
* Creates a new discrete GdkScrollEvent for high resolution mouse wheels.
*
* Both axes send data in fractions of 120 where each multiple of 120
* amounts to one logical scroll event. Fractions of 120 indicate a wheel
* movement less than one detent.
*
* Returns: the newly created scroll event
*/
GdkEvent *
gdk_scroll_event_new_value120 (GdkSurface *surface,
GdkDevice *device,
GdkDeviceTool *tool,
guint32 time,
GdkModifierType state,
GdkScrollDirection direction,
double delta_x,
double delta_y)
{
GdkScrollEvent *self = gdk_event_alloc (GDK_SCROLL, surface, device, time);
self->tool = tool != NULL ? g_object_ref (tool) : NULL;
self->state = state;
self->direction = direction;
self->delta_x = delta_x / 120.0;
self->delta_y = delta_y / 120.0;
self->unit = GDK_SCROLL_UNIT_WHEEL;
return (GdkEvent *) self;
}
/**
* gdk_scroll_event_get_direction:
* @event: (type GdkScrollEvent): a scroll event

9
gdk/gdkeventsprivate.h
View File

@ -495,6 +495,15 @@ GdkEvent * gdk_scroll_event_new_discrete (GdkSurface *surface,
GdkModifierType state,
GdkScrollDirection direction);
GdkEvent * gdk_scroll_event_new_value120 (GdkSurface *surface,
GdkDevice *device,
GdkDeviceTool *tool,
guint32 time,
GdkModifierType state,
GdkScrollDirection direction,
double delta_x,
double delta_y);
GdkEvent * gdk_touch_event_new (GdkEventType type,
GdkEventSequence *sequence,
GdkSurface *surface,