I want to make Qt 5.1.1 touch example application work with qtwayland module.
I get the window on display, and also I get the touch traces from Weston. I see qtwayland is also getting triggered with the callback function that is registered for touch-up, touch-down, touch-motion.
But, QT doesn't invoke the QPushButton handler in QT application.
Connect API I am using as below: connect(ui->b_audio, SIGNAL(pressed()), this, SLOT(on_b_audio_clicked()));
Any clue why this could happen? Please suggest probable problems so that I can explore and debug.
Thanks in Advance. Bhushan.
In QtWayland, QWaylandInputDevice::touch_frame() passes the touch points to Qt internal window system through QWindowSystemInterface::handleTouchEvent(). Weston does not send WL_TOUCH_FRAME event at all, so the buttons or the QML MouseArea never receive touch event. You can add the following line to the end of evdev_flush_motion() in weston/src/evdev.c:
notify_touch(master, time, 0, 0, 0, WL_TOUCH_FRAME);
And rewrite the notify_touch() in weston/src/input.c:
WL_EXPORT void
notify_touch(struct weston_seat *seat, uint32_t time, int touch_id,
wl_fixed_t x, wl_fixed_t y, int touch_type)
{
struct weston_compositor *ec = seat->compositor;
struct weston_touch *touch = seat->touch;
struct weston_touch_grab *grab = touch->grab;
struct weston_surface *es;
wl_fixed_t sx, sy;
struct weston_touch *grab_touch = grab->touch;
/* Update grab's global coordinates. */
touch->grab_x = x;
touch->grab_y = y;
switch (touch_type) {
case WL_TOUCH_DOWN:
weston_compositor_idle_inhibit(ec);
seat->num_tp++;
/* the first finger down picks the surface, and all further go
* to that surface for the remainder of the touch session i.e.
* until all touch points are up again. */
if (seat->num_tp == 1) {
es = weston_compositor_pick_surface(ec, x, y, &sx, &sy);
weston_touch_set_focus(seat, es);
} else if (touch->focus) {
es = (struct weston_surface *) touch->focus;
weston_surface_from_global_fixed(es, x, y, &sx, &sy);
} else {
/* Unexpected condition: We have non-initial touch but
* there is no focused surface.
*/
weston_log("touch event received with %d points down"
"but no surface focused\n", seat->num_tp);
return;
}
grab->interface->down(grab, time, touch_id, sx, sy);
if (seat->num_tp == 1) {
touch->grab_serial =
wl_display_get_serial(ec->wl_display);
touch->grab_time = time;
touch->grab_x = x;
touch->grab_y = y;
}
break;
case WL_TOUCH_MOTION:
es = (struct weston_surface *) touch->focus;
if (!es)
break;
weston_surface_from_global_fixed(es, x, y, &sx, &sy);
grab->interface->motion(grab, time, touch_id, sx, sy);
break;
case WL_TOUCH_UP:
weston_compositor_idle_release(ec);
seat->num_tp--;
grab->interface->up(grab, time, touch_id);
break;
case WL_TOUCH_FRAME:
if (grab_touch->focus_resource) {
wl_touch_send_frame(grab_touch->focus_resource);
if (seat->num_tp == 0)
weston_touch_set_focus(seat, NULL);
}
}
}
Meanwhile, I find that weston does not handle multi-touch properly because its mt structure (below) uses an int value 'slot' which can only track the current slot number.
struct {
int slot;
int32_t x[MAX_SLOTS];
int32_t y[MAX_SLOTS];
} mt;
In multi-touch protocol type B, each slot associates with a finger contact and you get multiple slot events in a touch frame, for example, a touch_down frame;
ABS_MT_SLOT
ABS_MT_TRACKING_ID
ABS_MT_POSITION_X
ABS_MT_POSITION_Y
ABS_MT_SLOT
ABS_MT_TRACKING_ID
ABS_MT_POSITION_X
ABS_MT_POSITION_Y
EV_SYN
weston handles events from first slot event to the EV_SYN event, and it call notify_touch() if EV_SYN is encountered. Therefore, weston cannot send the two touch down events sequentially via notify_touch() with different slot number parameter.
In my reimplementation, I change the mt structure:
struct {
int current_slot;
uint32_t num_down_event;
uint32_t num_motion_event;
uint32_t num_up_event;
int slots[MAX_CONTACTS];
int32_t x[MAX_SLOTS];
int32_t y[MAX_SLOTS];
} mt;