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selection: create global single_selected_trip() function

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The DiveListView had a singleSelectedTrip function that
returns the selected trip if exactly one trip is selected.
This could be very slow if numerous non-trip items were
selected, because all the selection indices were back-
translated by the proxy model.

This could make selection changes very slow, because the
MainTab used said function to determine whether it should
show trip or dive data.. Indeed, with a 3500 dive test log,
when selecting all dives in tree mode, the updating of the
TabWidgets is sped up from 130 ms to 5 ms this commit.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2020-05-02 18:14:44 +02:00 • committed by Dirk Hohndel
parent 5147131701
commit 769915f3fe
5 changed files with 17 additions and 23 deletions
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core/selection.h
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@ -23,6 +23,7 @@ extern void select_newest_visible_dive();
extern void select_single_dive(struct dive *d); // wrapper for setSelection() with a single dive. NULL clears the selection.
extern void select_trip(struct dive_trip *trip);
extern void deselect_trip(struct dive_trip *trip);
extern struct dive_trip *single_selected_trip(); // returns trip if exactly one trip is selected, NULL otherwise.
extern void clear_selection(void);
#if DEBUG_SELECTION_TRACKING