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ui/gtk: enable backend to send multi-touch events 

GTK3 provides the infrastructure to receive and process multi-touch
events through the "touch-event" signal and the GdkEventTouch type.
Make use of it to transpose events from the host to the guest.

This allows users of machines with hardware capable of receiving
multi-touch events to run guests that can also receive those events
and interpret them as gestures, when appropriate.

An example of this in action can be seen here:

 https://fosstodon.org/@slp/109545849296546767

Signed-off-by: Sergio Lopez <slp@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230526112925.38794-7-slp@redhat.com>
This commit is contained in:
Sergio Lopez 2023-05-26 13:29:25 +02:00 committed by Marc-André Lureau
parent f6157392d4
commit 5a4cb61ae1
1 changed files with 92 additions and 0 deletions
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92
ui/gtk.c
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@ -130,6 +130,13 @@ typedef struct VCChardev VCChardev;
DECLARE_INSTANCE_CHECKER(VCChardev, VC_CHARDEV,
TYPE_CHARDEV_VC)
struct touch_slot {
int x;
int y;
int tracking_id;
};
static struct touch_slot touch_slots[INPUT_EVENT_SLOTS_MAX];
bool gtk_use_gl_area;
static void gd_grab_pointer(VirtualConsole *vc, const char *reason);
@ -1057,6 +1064,82 @@ static gboolean gd_scroll_event(GtkWidget *widget, GdkEventScroll *scroll,
}
static gboolean gd_touch_event(GtkWidget *widget, GdkEventTouch *touch,
void *opaque)
{
VirtualConsole *vc = opaque;
struct touch_slot *slot;
uint64_t num_slot = GPOINTER_TO_UINT(touch->sequence);
bool needs_sync = false;
int update;
int type = -1;
int i;
if (num_slot >= INPUT_EVENT_SLOTS_MAX) {
warn_report("gtk: unexpected touch slot number: % " PRId64" >= %d\n",
num_slot, INPUT_EVENT_SLOTS_MAX);
return FALSE;
}
slot = &touch_slots[num_slot];
slot->x = touch->x;
slot->y = touch->y;
switch (touch->type) {
case GDK_TOUCH_BEGIN:
type = INPUT_MULTI_TOUCH_TYPE_BEGIN;
slot->tracking_id = num_slot;
break;
case GDK_TOUCH_UPDATE:
type = INPUT_MULTI_TOUCH_TYPE_UPDATE;
break;
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
type = INPUT_MULTI_TOUCH_TYPE_END;
break;
default:
warn_report("gtk: unexpected touch event type\n");
}
for (i = 0; i < INPUT_EVENT_SLOTS_MAX; ++i) {
if (i == num_slot) {
update = type;
} else {
update = INPUT_MULTI_TOUCH_TYPE_UPDATE;
}
slot = &touch_slots[i];
if (slot->tracking_id == -1) {
continue;
}
if (update == INPUT_MULTI_TOUCH_TYPE_END) {
slot->tracking_id = -1;
qemu_input_queue_mtt(vc->gfx.dcl.con, update, i, slot->tracking_id);
needs_sync = true;
} else {
qemu_input_queue_mtt(vc->gfx.dcl.con, update, i, slot->tracking_id);
qemu_input_queue_btn(vc->gfx.dcl.con, INPUT_BUTTON_TOUCH, true);
qemu_input_queue_mtt_abs(vc->gfx.dcl.con,
INPUT_AXIS_X, (int) slot->x,
0, surface_width(vc->gfx.ds),
i, slot->tracking_id);
qemu_input_queue_mtt_abs(vc->gfx.dcl.con,
INPUT_AXIS_Y, (int) slot->y,
0, surface_height(vc->gfx.ds),
i, slot->tracking_id);
needs_sync = true;
}
}
if (needs_sync) {
qemu_input_event_sync();
}
return TRUE;
}
static const guint16 *gd_get_keymap(size_t *maplen)
{
GdkDisplay *dpy = gdk_display_get_default();
@ -1978,6 +2061,8 @@ static void gd_connect_vc_gfx_signals(VirtualConsole *vc)
G_CALLBACK(gd_key_event), vc);
g_signal_connect(vc->gfx.drawing_area, "key-release-event",
G_CALLBACK(gd_key_event), vc);
g_signal_connect(vc->gfx.drawing_area, "touch-event",
G_CALLBACK(gd_touch_event), vc);
g_signal_connect(vc->gfx.drawing_area, "enter-notify-event",
G_CALLBACK(gd_enter_event), vc);
@ -2087,6 +2172,7 @@ static GSList *gd_vc_gfx_init(GtkDisplayState *s, VirtualConsole *vc,
GSList *group, GtkWidget *view_menu)
{
bool zoom_to_fit = false;
int i;
vc->label = qemu_console_get_label(con);
vc->s = s;
@ -2134,6 +2220,7 @@ static GSList *gd_vc_gfx_init(GtkDisplayState *s, VirtualConsole *vc,
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON_MOTION_MASK |
GDK_TOUCH_MASK |
GDK_ENTER_NOTIFY_MASK |
GDK_LEAVE_NOTIFY_MASK |
GDK_SCROLL_MASK |
@ -2169,6 +2256,11 @@ static GSList *gd_vc_gfx_init(GtkDisplayState *s, VirtualConsole *vc,
s->free_scale = true;
}
for (i = 0; i < INPUT_EVENT_SLOTS_MAX; i++) {
struct touch_slot *slot = &touch_slots[i];
slot->tracking_id = -1;
}
return group;
}