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Improve row-wise access #21

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@imagejan

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@ctrueden Edit: migrated from imagej/imagej-common#26:

I believed the Table API (e.g., for Results tables) was pretty thorough, but when trying to use it to implement a new IJ2 List Shortcuts command, I discovered that there are no appendRow methods. These would be a nice convenience, rather than having to explicitly call set(String colHeader, int row, Object value) for each cell of the row.

Actually, there are appendRow methods, but none that take the actual row data. So the current ListShortcuts implementation does:

shortcuts.appendRow();
shortcuts.set(hotKeyHeader, row, shortcut.toString());
shortcuts.set(commandHeader, row, info.getTitle());

When what would be nicer would be:

shortcuts.appendRow(shortcut.toString(), info.getTitle());

Of course, while this is more succinct, it also loses the column-safety, assuming columns are in a particular order.

Migrated-From: http://trac.imagej.net/ticket/1646

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