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Diffstat (limited to 'src/macos/pardes.h')
| -rw-r--r-- | src/macos/pardes.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/macos/pardes.h b/src/macos/pardes.h index 5f1ccf77..a2d13b1f 100644 --- a/src/macos/pardes.h +++ b/src/macos/pardes.h @@ -377,6 +377,24 @@ void pardes_watch_changed(uint8_t pane, uint32_t generation); void pardes_scroll(float delta_rows, float delta_cols, uint16_t col, uint16_t row); +// The gesture boundaries around pardes_scroll, and the whole of scroll +// momentum. `begin` is fingers down: it catches a coast the way a hand catches +// a spinning dial, and drops whatever the last gesture left banked. `end` is +// fingers up: a swipe still moving when it ended becomes a fling, in +// proportion to how hard it was thrown, on the same curve pardes_rotate_end +// uses — momentum ramps up from zero rather than switching on at a threshold. +// +// A coast makes pardes_animating true and is spent by pardes_animation_tick, +// and it stops at the end of a document instead of spinning against the edge. +// +// A host whose windowing system already flings for it needs no suppression: +// the system's momentum arrives as ordinary pardes_scroll calls, every one of +// which cancels the coast before spending its own travel, so that momentum +// simply takes the gesture over. A host that calls neither — a discrete wheel +// has no phases — scrolls with no momentum at all. +void pardes_scroll_begin(void); +void pardes_scroll_end(void); + // A two-finger trackpad rotation, in degrees since the last call, positive // counterclockwise (AppKit's sign, unchanged). The core has no rotation: this // is spent as the search-step keys, clockwise `n` and counterclockwise `N`, a |