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snap: cache and ignore last-snapped edge when growing or shrinking

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When growing or shrinking a view by snapping to an edge, a client may
ignore the requested size and instead keep its original size or
substitute a different (possibly constrained) size. In this case, the
view may not actually contact the snapped edge, and a subsequent snap
attempt will just keep re-trying (and failing) to contact the same ege.

To mitigate this, remember the last-snapped view, snapping direction and
offset of the snapping edge in snap.c; when re-attempting a snap for the
same view in the same direction, ignore the edge that was last "hit", to
allow snapping to progress beyond the problematic edge.
This commit is contained in:
Andrew J. Hesford 2024-04-02 15:58:50 -04:00 • committed by Johan Malm
parent 9de487cecf
commit 2bf285a2c6
11 changed files with 271 additions and 44 deletions
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20
include/snap-constraints.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef LABWC_SNAP_CONSTRAINTS_H
#define LABWC_SNAP_CONSTRAINTS_H
#include "common/border.h"
#include "view.h"
struct wlr_box;
void snap_constraints_set(struct view *view,
enum view_edge direction, struct wlr_box geom);
void snap_constraints_invalidate(struct view *view);
void snap_constraints_update(struct view *view);
struct wlr_box snap_constraints_effective(struct view *view,
enum view_edge direction);
#endif /* LABWC_SNAP_CONSTRAINTS_H */