Report held pointer buttons on every pointer event

Pointer events set button only on press and release, so wsap_term tracked
held buttons itself to tell a drag from a hover.

yasl_pointer_event.buttons now holds a YASL_BUTTON_BIT() mask of the buttons
held after each event. The common input queue tracks it from the DOWN and
UP events it queues, and clears it on INPUT_RESET and on allocation
failure. Wayland also clears it on leave, since the compositor sends leave
during a press only when it takes the pointer and no release follows. X11
and Cocoa keep it, because they deliver motion and the release to the
pressed window after leave.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/yasl/yasl.h b/include/yasl/yasl.h
index de9a62c..973c39d 100644
--- a/include/yasl/yasl.h
+++ b/include/yasl/yasl.h
@@ -299,6 +299,9 @@ enum yasl_pointer_button {
     YASL_BUTTON_FORWARD = 4, /**< Side "forward" button. */
 };
 
+/** Bit for a yasl_pointer_button in yasl_pointer_event.buttons. */
+#define YASL_BUTTON_BIT(button) (1u << (button))
+
 /** Pointer capture mode for a surface. */
 enum yasl_pointer_mode {
     YASL_POINTER_NORMAL = 0, /**< Absolute positions; cursor per yasl_surface_set_cursor(). */
@@ -376,6 +379,12 @@ struct yasl_pointer_event {
     struct yasl_vector2d scroll;
     /** DOWN/UP: which button changed. */
     enum yasl_pointer_button button;
+    /** YASL_BUTTON_BIT() mask of buttons held after this event, on every
+     * POINTER_* type. Tracked from this queue's DOWN and UP events for all
+     * devices; INPUT_RESET clears it. On Wayland LEAVE clears it too, since the
+     * compositor sends leave during a press only when it takes the pointer.
+     * X11 and Cocoa keep sending motion and the release after LEAVE. */
+    uint32_t buttons;
     /** Mouse, touch, pen, or eraser. */
     enum yasl_pointer_device device;
     /** yasl_mod bitmask at this event. */