input: add drawing tablet setup and event listeners

Co-authored-by: Consolatis <35009135+Consolatis@users.noreply.github.com>

diff --git a/include/input/drawing_tablet.h b/include/input/drawing_tablet.h
new file mode 100644 (file)
index 0000000..8043e7a
--- /dev/null
+++ b/include/input/drawing_tablet.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef LABWC_DRAWING_TABLET_H
+#define LABWC_DRAWING_TABLET_H
+
+#include <wayland-server-core.h>
+struct seat;
+struct wlr_device;
+struct wlr_input_device;
+
+struct drawing_tablet {
+       struct seat *seat;
+       struct wlr_tablet *tablet;
+       double x, y;
+       struct {
+               struct wl_listener axis;
+               struct wl_listener tip;
+               struct wl_listener button;
+               struct wl_listener destroy;
+               // no interest in proximity events
+       } handlers;
+};
+
+void drawing_tablet_setup_handlers(struct seat *seat, struct wlr_input_device *wlr_input_device);
+
+#endif /* LABWC_DRAWING_TABLET_H */

diff --git a/src/input/drawing_tablet.c b/src/input/drawing_tablet.c
new file mode 100644 (file)
index 0000000..540642b
--- /dev/null
+++ b/src/input/drawing_tablet.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <assert.h>
+#include <stdlib.h>
+#include <linux/input-event-codes.h>
+#include <wlr/types/wlr_tablet_pad.h>
+#include <wlr/types/wlr_tablet_tool.h>
+#include <wlr/util/log.h>
+#include "common/macros.h"
+#include "common/mem.h"
+#include "config/rcxml.h"
+#include "input/cursor.h"
+#include "input/drawing_tablet.h"
+
+#include "config/rcxml.h"
+
+static void
+handle_axis(struct wl_listener *listener, void *data)
+{
+       struct wlr_tablet_tool_axis_event *ev = data;
+       struct drawing_tablet *tablet = ev->tablet->data;
+       if (ev->updated_axes & (WLR_TABLET_TOOL_AXIS_X | WLR_TABLET_TOOL_AXIS_Y)) {
+               if (ev->updated_axes & WLR_TABLET_TOOL_AXIS_X) {
+                       tablet->x = ev->x;
+               }
+               if (ev->updated_axes & WLR_TABLET_TOOL_AXIS_Y) {
+                       tablet->y = ev->y;
+               }
+
+               double x = tablet->x;
+               double y = tablet->y;
+               cursor_emulate_move_absolute(tablet->seat, &ev->tablet->base, x, y, ev->time_msec);
+       }
+       // Ignore other events
+}
+
+static void
+handle_tip(struct wl_listener *listener, void *data)
+{
+       struct wlr_tablet_tool_tip_event *ev = data;
+       struct drawing_tablet *tablet = ev->tablet->data;
+
+       cursor_emulate_button(tablet->seat,
+               BTN_LEFT,
+               ev->state == WLR_TABLET_TOOL_TIP_DOWN
+                       ? WLR_BUTTON_PRESSED
+                       : WLR_BUTTON_RELEASED,
+               ev->time_msec);
+}
+
+static void
+handle_button(struct wl_listener *listener, void *data)
+{
+       struct wlr_tablet_tool_button_event *ev = data;
+       struct drawing_tablet *tablet = ev->tablet->data;
+
+       uint32_t button;
+       switch (ev->button) {
+       case BTN_STYLUS:
+               button = BTN_RIGHT;
+               break;
+       case BTN_STYLUS2:
+               button = BTN_MIDDLE;
+               break;
+       default:
+               wlr_log(WLR_DEBUG, "no button map target");
+               return;
+       }
+
+       cursor_emulate_button(tablet->seat, button, ev->state, ev->time_msec);
+}
+
+static void
+handle_destroy(struct wl_listener *listener, void *data)
+{
+       struct drawing_tablet *tablet =
+               wl_container_of(listener, tablet, handlers.destroy);
+       free(tablet);
+}
+
+static void
+setup_pad(struct seat *seat, struct wlr_input_device *wlr_device)
+{
+       wlr_log(WLR_INFO, "not setting up pad");
+}
+
+static void
+setup_pen(struct seat *seat, struct wlr_input_device *wlr_device)
+{
+       wlr_log(WLR_DEBUG, "setting up tablet");
+       struct drawing_tablet *tablet = znew(*tablet);
+       tablet->seat = seat;
+       tablet->tablet = wlr_tablet_from_input_device(wlr_device);
+       tablet->tablet->data = tablet;
+       tablet->x = 0.0;
+       tablet->y = 0.0;
+       CONNECT_SIGNAL(tablet->tablet, &tablet->handlers, axis);
+       CONNECT_SIGNAL(tablet->tablet, &tablet->handlers, tip);
+       CONNECT_SIGNAL(tablet->tablet, &tablet->handlers, button);
+       CONNECT_SIGNAL(wlr_device, &tablet->handlers, destroy);
+}
+
+void
+drawing_tablet_setup_handlers(struct seat *seat, struct wlr_input_device *device)
+{
+       switch (device->type) {
+       case WLR_INPUT_DEVICE_TABLET_PAD:
+               setup_pad(seat, device);
+               break;
+       case WLR_INPUT_DEVICE_TABLET_TOOL:
+               setup_pen(seat, device);
+               break;
+       default:
+               assert(false && "tried to add non-tablet as tablet");
+       }
+}

diff --git a/src/input/meson.build b/src/input/meson.build
index cfdd3cd086d5f9731f8601661e7d1f88f798f582..91d897a9662ee9a67cc707c12464bbb9f12d81f8 100644 (file)
--- a/src/input/meson.build
+++ b/src/input/meson.build
@@ -1,5 +1,6 @@
 labwc_sources += files(
   'cursor.c',
+  'drawing_tablet.c',
   'gestures.c',
   'input.c',
   'keyboard.c',