Implement different zoom levels for dive photos tab

This implements different zoom levels for the dive photos tab as
suggested by Stefan Fuchs <sfuchs@gmx.de> in #898.
The zoom level can be changed using a slider or CTRL+mousewheel.
Zoom levels range from a third of the standard thumbnail size to
thrice the standard thumbnail size.

Thumbnails are cached in maximum resolution and scaled down on
the fly. Because the profile widget took its pictures from the
photo list model, an extra picture copy with a fixed size had
to be introduced.

The UI is still a bit crude.

Reported-by: Stefan Fuchs <sfuchs@gmx.de>
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

1 files changed, 5 insertions, 0 deletions

diff --git a/qt-models/divepicturemodel.h b/qt-models/divepicturemodel.h
index 53a72076a..74f92f449 100644
--- a/qt-models/divepicturemodel.h
+++ b/qt-models/divepicturemodel.h
@@ -10,6 +10,7 @@ struct PictureEntry {
 	struct picture *picture;
 	QString filename;
 	QImage image;
+	QImage imageProfile;	// For the profile widget keep a copy of a constant sized image
 	int offsetSeconds;
 };
 
@@ -24,9 +25,13 @@ public:
 	void updateDivePicturesWhenDone(QList<QFuture<void>>);
 	void removePicture(const QString& fileUrl, bool last);
 	int rowDDStart, rowDDEnd;
+public slots:
+	void setZoomLevel(int level);
 private:
 	DivePictureModel();
 	QList<PictureEntry> pictures;
+	double zoomLevel;	// -1.0: minimum, 0.0: standard, 1.0: maximum
+	void updateThumbnails();
 };
 
 #endif