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Dive pictures: don't update all images on drag&drop to profile

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Gracefully handle drag & drop to the profile, which changes the
offset of the pictures. To do this, keep the pictures in the
DivePictureModel and the ProfileWidget2 sorted by offset and
re-arrange if needed to keep the list sorted. This needs some
code reshuffling.

Introduce a helper-function that moves ranges in arrays.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Berthold Stoeger 2018-06-30 21:32:14 +02:00 • committed by Dirk Hohndel
parent 0aaa1bf386
commit 9efb56e2d4
5 changed files with 174 additions and 38 deletions
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46
qt-models/divepicturemodel.cpp
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@ -56,8 +56,14 @@ void DivePictureModel::updateDivePictures()
struct dive *dive;
for_each_dive (i, dive) {
if (dive->selected) {
int first = pictures.count();
FOR_EACH_PICTURE(dive)
pictures.push_back({picture, picture->filename, {}, picture->offset.seconds});
pictures.push_back({ dive->id, picture, picture->filename, {}, picture->offset.seconds });
// Sort pictures of this dive by offset.
// Thus, the list will be sorted by (diveId, offset).
std::sort(pictures.begin() + first, pictures.end(),
[](const PictureEntry &a, const PictureEntry &b) { return a.offsetSeconds < b.offsetSeconds; });
}
}
@ -166,11 +172,39 @@ void DivePictureModel::updateThumbnail(QString filename, QImage thumbnail)
}
}
void DivePictureModel::updateDivePictureOffset(const QString &filename, int offsetSeconds)
void DivePictureModel::updateDivePictureOffset(int diveId, const QString &filename, int offsetSeconds)
{
int i = findPictureId(filename);
if (i >= 0) {
pictures[i].offsetSeconds = offsetSeconds;
emit dataChanged(createIndex(i, 0), createIndex(i, 1));
// Find the pictures of the given dive.
auto from = std::find_if(pictures.begin(), pictures.end(), [diveId](const PictureEntry &e) { return e.diveId == diveId; });
auto to = std::find_if(from, pictures.end(), [diveId](const PictureEntry &e) { return e.diveId != diveId; });
// Find picture with the given filename
auto oldPos = std::find_if(from, to, [filename](const PictureEntry &e) { return e.filename == filename; });
if (oldPos == to)
return;
// Find new position
auto newPos = std::find_if(from, to, [offsetSeconds](const PictureEntry &e) { return e.offsetSeconds > offsetSeconds; });
// Update the offset here and in the backend
oldPos->offsetSeconds = offsetSeconds;
if (struct dive *dive = get_dive_by_uniq_id(diveId)) {
FOR_EACH_PICTURE(dive) {
if (picture->filename == filename) {
picture->offset.seconds = offsetSeconds;
mark_divelist_changed(true);
break;
}
}
copy_dive(current_dive, &displayed_dive);
}
// Henceforth we will work with indices instead of iterators
int oldIndex = oldPos - pictures.begin();
int newIndex = newPos - pictures.begin();
if (oldIndex == newIndex || oldIndex + 1 == newIndex)
return;
beginMoveRows(QModelIndex(), oldIndex, oldIndex, QModelIndex(), newIndex);
moveInVector(pictures, oldIndex, oldIndex + 1, newIndex);
endMoveRows();
}