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bar: wayland: initial support for mouse wheel up/down

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Daniel Eklöf 2021-06-22 20:20:06 +02:00
parent 93a5bbb4a4
commit 530afe6cf5
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GPG key ID: 5BBD4992C116573F
1 changed files with 62 additions and 0 deletions
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62
bar/wayland.c
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@ -113,6 +113,9 @@ struct wayland_backend {
struct buffer *next_buffer; /* Bar is rendering to this one */
struct buffer *pending_buffer; /* Finished, but not yet rendered */
double aggregated_scroll;
bool have_discrete;
void (*bar_expose)(const struct bar *bar);
void (*bar_on_mouse)(struct bar *bar, enum mouse_event event,
enum mouse_button btn, int x, int y);
@ -248,6 +251,8 @@ wl_pointer_leave(void *data, struct wl_pointer *wl_pointer,
struct seat *seat = data;
struct wayland_backend *backend = seat->backend;
backend->have_discrete = false;
if (backend->active_seat == seat)
backend->active_seat = NULL;
}
@ -297,11 +302,46 @@ static void
wl_pointer_axis(void *data, struct wl_pointer *wl_pointer,
uint32_t time, uint32_t axis, wl_fixed_t value)
{
if (axis != WL_POINTER_AXIS_VERTICAL_SCROLL)
return;
struct seat *seat = data;
struct wayland_backend *backend = seat->backend;
backend->active_seat = seat;
if (backend->have_discrete)
return;
const double amount = wl_fixed_to_double(value);
if ((backend->aggregated_scroll > 0 && amount < 0) ||
(backend->aggregated_scroll < 0 && amount > 0))
{
backend->aggregated_scroll = amount;
} else
backend->aggregated_scroll += amount;
enum mouse_button btn = backend->aggregated_scroll > 0
? MOUSE_BTN_WHEEL_DOWN
: MOUSE_BTN_WHEEL_UP;
const double step = 20.;
const double adjust = backend->aggregated_scroll > 0 ? -step : step;
while (fabs(backend->aggregated_scroll) >= step) {
backend->bar_on_mouse(
backend->bar, ON_MOUSE_CLICK, btn,
seat->pointer.x, seat->pointer.y);
backend->aggregated_scroll += adjust;
}
}
static void
wl_pointer_frame(void *data, struct wl_pointer *wl_pointer)
{
struct seat *seat = data;
struct wayland_backend *backend = seat->backend;
backend->have_discrete = false;
}
static void
@ -314,12 +354,34 @@ static void
wl_pointer_axis_stop(void *data, struct wl_pointer *wl_pointer,
uint32_t time, uint32_t axis)
{
if (axis != WL_POINTER_AXIS_VERTICAL_SCROLL)
return;
struct seat *seat = data;
struct wayland_backend *backend = seat->backend;
backend->aggregated_scroll = 0.;
}
static void
wl_pointer_axis_discrete(void *data, struct wl_pointer *wl_pointer,
uint32_t axis, int32_t discrete)
{
if (axis != WL_POINTER_AXIS_VERTICAL_SCROLL)
return;
struct seat *seat = data;
struct wayland_backend *backend = seat->backend;
backend->have_discrete = true;
enum mouse_button btn = discrete > 0
? MOUSE_BTN_WHEEL_DOWN
: MOUSE_BTN_WHEEL_UP;
for (int32_t i = 0; i < discrete; i++) {
backend->bar_on_mouse(
backend->bar, ON_MOUSE_CLICK, btn,
seat->pointer.x, seat->pointer.y);
}
}
static const struct wl_pointer_listener pointer_listener = {