Made FilesTreeWidget work

It wasn't as easy as I thought. Quite big changes:

1. I changed the query for setIds in FilesTreeModel. Initially it
executed a database query for every id. Changed it to WHERE
seriespart_id IN (ids). I didn't have a chance to test the first
version, but this one is blazing fast.

2. Fixed a recursio ad infinitum in FilesTreeModel. This happens if you
call data() from data(). Either use the *item or use a role different
from what you've been called.

3. Introduce a new function in SeriesTreeModel: QList<QVariant>
childrenColumnList. It returns a QList from the children values of the
given column.

4. Lot's of UI changes. Hide unneded columns, align the remaining ones
properly.

What doesn't work:
we can't let the database do the sorting of files. We need a proxy for
this.

1 files changed, 8 insertions, 3 deletions

diff --git a/archivetreeview.h b/archivetreeview.h
index 613bdc6..9958138 100644
--- a/archivetreeview.h
+++ b/archivetreeview.h
@@ -9,12 +9,14 @@
 #define ARCHIVETREEVIEW_H
 
 #include <QWidget>
-#include <QList>
+#include <QModelIndexList>
 
 class SmUberModel;
 class SeriesTreeWidget;
 class FilesTreeWidget;
 class FilesTreeModel;
+class SeriesTreeModel;
+class QItemSelection;
 
 class ArchiveTreeView : public QWidget
 {
@@ -25,14 +27,17 @@ class ArchiveTreeView : public QWidget
 		FilesTreeWidget *filesWidget() { return mFilesWidget; }
 
 	private slots:
-		void currentChanged();
+		void currentChanged(const QItemSelection &selected, const QItemSelection &deselected);
 
 	private:
 		//widgets
 		SeriesTreeWidget *mSeriesWidget;
 		FilesTreeWidget *mFilesWidget;
-		QList<int> mSelectedPartIds;
 		FilesTreeModel *mFilesModel;
+		SeriesTreeModel *mSeriesModel;
+
+		//lists
+		QModelIndexList mSelectedItems;
 };
 
 #endif