Save-to-file in increments and add status label

[karlmsmith]

Reported by @karlmsmith on 29 Nov 2011 17:32 UTC
The save-to-file operation in the viewer should be done in increments, using the QTimer check-command callback (called when the viewer has no events to deal with) to perform another piece of the saving.

Since the number of drawing commands to a QPicture has now been capped, each increment of drawing can save one QPicture to file. This will prevent the GUI from becoming unresponsive when saving large and/or complex drawings.

A label should be added to the status area of the QMainWindow and should indicate when a file is being saved, or when the drawing is being redrawn.

Migrated-From: http://dunkel.pmel.noaa.gov/trac/ferret/ticket/1902

[karlmsmith]

Comment by @karlmsmith on 20 Dec 2011 18:13 UTC
Added messages to the status bar at the bottom of the window giving an indication of progress (piece 'n' out of 'total'). The mouse icon changes to a "working" icon to also give the user a clue that it is busy doing something.

Pushing the saving in increments to a lower priority for now.