The dfglib from tc3t

qt::CsvTableView: provide a read-only mode.

To prevent accidental edits and to make it possible to tune UI for read-only use case (could e.g. hide edit-related menu items in context menus).

qt::charts: Documentation for new operations

Both in guide and in context menu dialogs.

io::DelimitedTextReader: incorrect parsing if using separator autodetection and first cell is enclosed

Parsing input such as
"a",b
with separator auto detection fails to detect second cell and results to only one cell handler call with content a

dfgQtTableEditor: revise choice of default separator

Diff application seem to have some problems dealing with unit separator (\1F), so to be revised if it is a good default choice as separator instead of comma.

Testing: Improvements to template and loop handling in unit testing

Currently many of the unit tests use loops and templates and if something fails, reasoning about the actual cause from the output maybe hard as failing line can occur in various contexts. There are ways readily available to improve such cases and those might worth taking into use at least when writing new tests.

Some references:
https://stackoverflow.com/questions/17079702/gtest-testing-template-class
https://stackoverflow.com/questions/50843846/gtest-report-index-variable-for-loop-with-expect-eq
https://github.com/google/googletest/blob/master/googletest/docs/primer.md
https://github.com/google/googletest/blob/master/googletest/docs/advanced.md#typed-tests

qt::charts: provide easier chart item controls

JSON-based controls are not that convenient to use so for better user experience, need "basic" and "advanced" modes for chart item definition widget.

qt::CsvItemModel: auto detection for \r EOL

Currently trying to open file that uses \r EOL causes even for relatively small file the table to have huge number of columns. Since every column among other things allocates 2k content block, this can easily cause memory consumption to grow too much or if memory consumption can be coped with, table view view may effectively freeze due to the high number of columns.

qt::CsvTableView: add ability to generate content using formula parser

cont::TableSz: improve (row, ptr) storage

(row, ptr)-container might be better as vector-based instead of map-based. If, however, keeping map-based structure, at least SoA-style should probably be used to avoid wasting space for padding as current happens in 64-bit builds (pair size with int32-index: 32-bit 4+4=8, with 64-bit 4+8+padding=16).

dfgQtTableEditor: add ability use whole table as data source

qt::CsvTableView: opening a file should be cancellable

Currently if opening a file that takes too long to open, the only way to stop loading is to terminate the application. To require less dramatic actions, Open-dialog could provide "Cancel"-button.

charts: add ability to define line colour for chart item

io::BasicIfStream: implement buffering for improved performance

Currently BasicIfStream calls fgetc() on every get(), which is pretty heavy operation compared to what would suffice in case that there was a separate read buffer from which to return next char.

qt::charts: Add SQLiteDataSource

Like CsvFileDataSource, but for reading from SQLite database.

charts: add operation for generic element-wise arithmetic transforms

New chart operation to be able to make custom element-wise transforms such as shifts, at least +-*/ is to be supported and it should be readily available to add unary operations later on.

qt::charts: add detail tooltip for charts

To show detailed information about nearby points, e.g. for scatter plots (x, y) values.

qt::charts: ability to load chart definition from .conf file

In order to keep the chart definitions between different sessions, json-list could be stored e.g. to .conf-file related to the .csv-file.

charts: add ability to define chart position in chart grid

Needs new chart item properties and actual plotting implementation. For implementation with QCustomPlot, see QCPLayoutGrid and setupAdvancedAxesDemo() in examples.

qt::CsvTableView: add "Save visible" functionality

Currently the only way to save a filtered view is to copy-paste it to a new table and save. There could be a direct option "Save visible".

qt::charts: graphs in same panel should automatically have different colours

Currently all graphs have the same line/point colour and while it can can set manually, for convenience different graphs in same panel should automatically have different colours.

math::FormulaParser: add functions for generating random values from distributions defined in rand/distributionsHelpers.hpp

Examples: new example for automated chart export

With csv/sqlite file data sources and json chart entry definition, it should be possible to create e.g. a command line application doing chart exports without user interaction. Either completely new example or bundled to dfgQtTableEditor.

qt::CsvItemModel: ability to use read filter from .conf-file

Would make it possible to open filtered view without the need to every time manually "Open file with options".

qt::charts: ability export chart to file

QCustomPlot already has functionality available (QCustomPlot::savePdf() et al.), only context menu entries and dialog for choosing export parameters are needed.

qt::charts: add ability to define chart background colour

qt::charts: ability to create histograms from text content

Currently histograms can be created from numerical data, but not from text. With this feature it would be possible to do histogram from column content like
a,b,c,a,a,b,b,c,c,c,c,a
which would effectively be identical to bar chart (#35) from content
a,4
b,3
c,5

qt::charts: add ability to plot timestamp data

qt::TableEditor: add multicolumn filtering

Currently it is possible to filter only by single column or from all columns. While it is often possible to achieve effectively the same multicolumn filtering result by using regexp and filtering from all columns, it is not always possible and possibly less convenient than being able to define filter expression for many columns.

qt::TableEditor: ability to choose calculated details shown in CsvTableViewBasicSelectionAnalyzerPanel

For example through context menu.

qt::charts: fill colour controls for chart types bars and histogram

Currently line colour can be controlled, but not fill colour of bars.

qt::charts: auto-expand option for grid panels

Ability to auto-expand panels could provide a convenient way to do some custom panel configurations without need for span controls.
For example creating three graphs where first would cover whole first grid line and the two others would be on second line, could be created by settings panels at (1, 1), (2, 1) and (2,2), and enabling auto-expand, which would detect that (1, 2) is empty and expand panel at (1, 1) rightwards.

qt::charts: revise terminology

Words such as 'chart', 'graph' and 'plot' may often be used more or less interchangeably, but at least within the library there should be defined terminology for clarity and consistency.