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# Technical notes
* Here I will try to write some note-snippets about internal architecture.
* I will try to add some text as I discover some relationships.
* **Caution:** some info here may be not 100% accurate. And probably - at all times - there will
be more info missing then contained.
## Classes
* NoteTable - database interface for notes
* NoteModel - handles "note model" - relation ship between internal representation (database table
NoteTable) and provides source data for table view with notes.
Here the multi column sorting is handled.
* NixNote (nixnote.cpp) - main window
* 1:N with NBrowserWindow
* NTabWidget - handles tab bar over note edit window (and the 1:N relationship between main window (NixNote)
and NBrowserWindow)
* also holds a list of browser tabs (NBrowserWindow) and external browser windows ()
* and does sync between them
* NBrowserWindow - represents one tab with note (in a tabbed interface)
* methods/signals
* updateNoteList(lid, column, data) => signal that some table column changes data
* saveNoteContent() - called to save note content (also validates HTML)
* NTitleEditor - title editor - instantiated in NBrowserWindow, but someway passed down
* NWebView - editor + some related stuff (actions, toolbar)
* NWebPage - just the html editor itself
+ ExternalBrowse - external browser window
* uses internally NBrowserWindow for content edit
* NTableView - table view with notes
* slots
* refreshCell(lid, column, data) - refresh one cell
* refreshData() - refresh whole table (does select from DB; more expensive then refreshCell())
## QT notes
* QVariant
* QVariant::QVariant() - create invalid variant => variant.isValid()
* http://doc.qt.io/qt-5/qvariant.html
* enum Qt::ItemDataRole - model - role
* http://doc.qt.io/qt-5/qt.html#ItemDataRole-enum
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