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 <s...@redhat.com> --- ui/gtk.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) diff --git a/ui/gtk.c b/ui/gtk.c index fd82e9b1ca..bf1e7f086d 100644 --- a/ui/gtk.c +++ b/ui/gtk.c @@ -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); @@ -1058,6 +1065,74 @@ 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 = (uint64_t) touch->sequence; + int update; + int type = -1; + int i; + + if (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_MULTITOUCH_TYPE_BEGIN; + slot->tracking_id = num_slot; + break; + case GDK_TOUCH_UPDATE: + type = INPUT_MULTITOUCH_TYPE_UPDATE; + break; + case GDK_TOUCH_END: + case GDK_TOUCH_CANCEL: + type = INPUT_MULTITOUCH_TYPE_END; + break; + default: + fprintf(stderr, "%s: unexpected touch event\n", __func__); + } + + for (i = 0; i < INPUT_EVENT_SLOTS_MAX; ++i) { + if (i == num_slot) { + update = type; + } else { + update = INPUT_MULTITOUCH_TYPE_UPDATE; + } + + slot = &touch_slots[i]; + + if (slot->tracking_id == -1) { + continue; + } + + if (update == INPUT_MULTITOUCH_TYPE_END) { + slot->tracking_id = -1; + qemu_input_queue_mtt(vc->gfx.dcl.con, update, i, slot->tracking_id); + } 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); + } + qemu_input_event_sync(); + } + + return TRUE; +} + static const guint16 *gd_get_keymap(size_t *maplen) { GdkDisplay *dpy = gdk_display_get_default(); @@ -1977,6 +2052,8 @@ 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); @@ -2086,6 +2163,7 @@ 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; @@ -2133,6 +2211,7 @@ 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 | @@ -2168,6 +2247,11 @@ 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; } -- 2.38.1