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feat(wayland): touch, with the first finger standing in for the pointer

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The seat's wl_touch was never bound, so a touchscreen could not drive a
window at all. Every finger is now reported through onTouchDown, onTouchMove,
onTouchUp and onTouchCancel (TouchPoint: the compositor's id and the
position in physical pixels). The first finger down also enters the window —
Device::focusedWindow and the pointer serial the clipboard needs — presses
the left button, moves it and releases it when it lifts, so an application
written for a pointer works on a phone as it is.
This commit is contained in:
Jorijn van der Graaf 2026-10-18 01:48:30 +02:00
commit aed6142cce
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
5 changed files with 104 additions and 0 deletions
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8
interfaces/Crafter.Graphics-Window.cppm
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@ -98,6 +98,14 @@ export namespace Crafter {
// touchpads, free-spinning wheels) is accumulated backend-side
// until a whole detent is reached.
Event<std::uint32_t> onMouseScroll;
// Touch, from the seat's wl_touch. The first finger down also drives
// currentMousePos and the left-button events until it lifts, so a
// pointer-only application works on a touchscreen as it is.
Event<TouchPoint> onTouchDown;
Event<TouchPoint> onTouchMove;
Event<TouchPoint> onTouchUp;
Event<void> onTouchCancel;
std::int32_t primaryTouchId = -1;
Vector<float, 2> currentMousePos;
Vector<float, 2> lastMousePos;
Vector<float, 2> mouseDelta;