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gdk: always populate GDK_AXIS_{X,Y} in merged event history

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Since GdkTimeCoord stores only axis values, prior to this change,
if a device didn't report GDK_AXIS_X or GDK_AXIS_Y, the history
attached to merged motion events wouldn't contain any positional
information.

Commit 6012276093 already addressed
this issue for devices without tools by storing the event position
in GdkTimeCoord using GDK_AXIS_X and GDK_AXIS_Y and augmenting the
GdkTimeCoord's axis bitmask accordingly.

This change generalizes that workaround to all devices. Note that
if a device DOES report values for GDK_AXIS_X and GDK_AXIS_Y, those
values won't be overwritten.

Closes #4809
This commit is contained in:
Hemidark 2022-04-05 14:56:33 -07:00
parent 21cba193ad
commit 0c44851848
1 changed files with 8 additions and 2 deletions
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10
gdk/gdkevents.c
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@ -757,15 +757,21 @@ gdk_motion_event_push_history (GdkEvent *event,
memset (&hist, 0, sizeof (GdkTimeCoord));
hist.time = gdk_event_get_time (history_event);
if (tool)
{
hist.flags = gdk_device_tool_get_axes (tool);
for (i = GDK_AXIS_X; i < GDK_AXIS_LAST; i++)
gdk_event_get_axis (history_event, i, &hist.axes[i]);
}
else
/* GdkTimeCoord has no dedicated fields to record event position. For plain
* pointer events, and for tools which don't report GDK_AXIS_X/GDK_AXIS_Y
* on their own, we surface the position using the X and Y input axes.
*/
if (!(hist.flags & GDK_AXIS_FLAG_X) || !(hist.flags & GDK_AXIS_FLAG_Y))
{
hist.flags = GDK_AXIS_FLAG_X | GDK_AXIS_FLAG_Y;
hist.flags |= GDK_AXIS_FLAG_X | GDK_AXIS_FLAG_Y;
gdk_event_get_position (history_event, &hist.axes[GDK_AXIS_X], &hist.axes[GDK_AXIS_Y]);
}