undo: implement undo of setting a picture time by drag&drop

Even though the functionality is seemingly trivial, this is a bit
invasive, as the code has to be split into two distinct parts:
1) Post undo command
2) React to changes to the divelist

Don't compile that code on mobile.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

2 files changed, 11 insertions, 16 deletions

diff --git a/qt-models/divepicturemodel.cpp b/qt-models/divepicturemodel.cpp
index 306030c4e..e50c51744 100644
--- a/qt-models/divepicturemodel.cpp
+++ b/qt-models/divepicturemodel.cpp
@@ -6,6 +6,7 @@
 #include "core/imagedownloader.h"
 #include "core/picture.h"
 #include "core/qthelper.h"
+#include "core/subsurface-qt/divelistnotifier.h"
 
 #include <QFileInfo>
 #include <QPainter>
@@ -20,6 +21,8 @@ DivePictureModel::DivePictureModel() : zoomLevel(0.0)
 {
 	connect(Thumbnailer::instance(), &Thumbnailer::thumbnailChanged,
 		this, &DivePictureModel::updateThumbnail, Qt::QueuedConnection);
+	connect(&diveListNotifier, &DiveListNotifier::pictureOffsetChanged,
+		this, &DivePictureModel::pictureOffsetChanged);
 }
 
 void DivePictureModel::setZoomLevel(int level)
@@ -212,13 +215,13 @@ void DivePictureModel::updateThumbnail(QString filename, QImage thumbnail, durat
 	}
 }
 
-void DivePictureModel::updateDivePictureOffset(int diveId, const QString &filenameIn, int offsetSeconds)
+void DivePictureModel::pictureOffsetChanged(dive *d, const QString filenameIn, offset_t offset)
 {
 	std::string filename = filenameIn.toStdString();
 
 	// 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; });
+	auto from = std::find_if(pictures.begin(), pictures.end(), [d](const PictureEntry &e) { return e.diveId == d->id; });
+	auto to = std::find_if(from, pictures.end(), [d](const PictureEntry &e) { return e.diveId != d->id; });
 
 	// Find picture with the given filename
 	auto oldPos = std::find_if(from, to, [filename](const PictureEntry &e) { return e.filename == filename; });
@@ -226,20 +229,11 @@ void DivePictureModel::updateDivePictureOffset(int diveId, const QString &filena
 		return;
 
 	// Find new position
-	auto newPos = std::find_if(from, to, [offsetSeconds](const PictureEntry &e) { return e.offsetSeconds > offsetSeconds; });
+	auto newPos = std::find_if(from, to, [offset](const PictureEntry &e) { return e.offsetSeconds > offset.seconds; });
 
 	// 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);
-	}
+	oldPos->offsetSeconds = offset.seconds;
+	copy_dive(current_dive, &displayed_dive); // TODO: remove once profile can display arbitrary dives
 
 	// Henceforth we will work with indices instead of iterators
 	int oldIndex = oldPos - pictures.begin();
diff --git a/qt-models/divepicturemodel.h b/qt-models/divepicturemodel.h
index 1ed5e8095..2d628f429 100644
--- a/qt-models/divepicturemodel.h
+++ b/qt-models/divepicturemodel.h
@@ -18,6 +18,7 @@ struct PictureEntry {
 	duration_t length;
 };
 
+struct dive;
 class DivePictureModel : public QAbstractTableModel {
 	Q_OBJECT
 public:
@@ -27,12 +28,12 @@ public:
 	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
 	void updateDivePictures();
 	void removePictures(const QVector<QString> &fileUrls);
-	void updateDivePictureOffset(int diveId, const QString &filename, int offsetSeconds);
 signals:
 	void picturesRemoved(const QVector<QString> &fileUrls);
 public slots:
 	void setZoomLevel(int level);
 	void updateThumbnail(QString filename, QImage thumbnail, duration_t duration);
+	void pictureOffsetChanged(dive *d, const QString filename, offset_t offset);
 private:
 	DivePictureModel();
 	QVector<PictureEntry> pictures;