Merge pull request #184 from BCDA-APS/183-bug-slow

BUG: speed up GUI response times

@rodolakis Thanks!

.gitignore

@@ -167,6 +167,7 @@ cython_debug/
 
 # local developer code
 dev_*.py
+dev_*/
 
 # Qt (on Windows)
 gemviz/resources/*.py

gemviz/README.md

@@ -0,0 +1,40 @@
+# notes
+
+Terse summary of responsibilities of the source modules.
+
+- app
+  - parse command-line options
+  - setup logging
+  - starts GUI (MainWindow)
+- MainWindow class
+  - creates tiled client connection
+  - passes client to BRC_MVC class
+  - populate QComboBox with available catalog names
+  - When catalog is selected from QComboBox, create BRC_MVC.
+- BRC_MVC class
+  - (re)created each time catalog is chosen:
+    - set self.catalog
+    - remove previous QTableView
+    - create QTableView with default page offset and size
+    - each time filters are changed or catalog is updated:
+      - Set page offset from self.selected_uid (if not None)
+      - update QTableView with fcat_md (page of filtered catalog metadata)
+    - call SelectFieldsWidget when run is selected
+    - call ChartView when requested by SelectFieldsWidget
+  - BRCTableView class
+    - page through a filtered CatalogOfBlueskyRuns
+    - update BRCTableModel as page parameters or filtered catalog are changed
+  - BRCTableModel class
+    - display one page of runs in a table
+    - select a run for examination
+    - when run is selected, update self.selected_uid (emit a signal)
+  - SelectFieldsWidget class
+    - populate the table of plottable fields
+    - identify default data to plot (if any) and check the boxes
+    - request to plot data as directed by buttons
+  - ChartView class
+    - Determine dimensionality (and type of plot)
+    - Only plots 1-D line charts now.
+    - TODO: Expand to 2-D mesh and 2-D image views.
+
+...