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Add an idempotent, graphics-state startup flag 

Add `ChartPlotWidget._on_screen: bool` which allows detecting for the
first state where there is y-range-able flow data loaded and able to be
drawn. Check for this flag to be set in `.maxmin()` such that until the
historical data is loaded `.default_view()` will be called to ensure
that a blank view is never shown: race with the UI starting versus the
data layer loading flow graphics can have this outcome.
mxmn_from_m4
Tyler Goodlet 2022-06-28 09:37:12 -04:00
parent 147ceca016
commit ed2c962bb9
1 changed files with 17 additions and 7 deletions
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24
piker/ui/_chart.py
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@ -761,6 +761,11 @@ class ChartPlotWidget(pg.PlotWidget):
self.pi_overlay: PlotItemOverlay = PlotItemOverlay(self.plotItem) self.pi_overlay: PlotItemOverlay = PlotItemOverlay(self.plotItem)
# indempotent startup flag for auto-yrange subsys
# to detect the "first time" y-domain graphics begin
# to be shown in the (main) graphics view.
self._on_screen: bool = False
def resume_all_feeds(self): def resume_all_feeds(self):
try: try:
for feed in self._feeds.values(): for feed in self._feeds.values():
@ -864,7 +869,8 @@ class ChartPlotWidget(pg.PlotWidget):
def default_view( def default_view(
self, self,
bars_from_y: int = 3000, bars_from_y: int = 616,
do_ds: bool = True,
) -> None: ) -> None:
''' '''
@ -925,8 +931,11 @@ class ChartPlotWidget(pg.PlotWidget):
max=end, max=end,
padding=0, padding=0,
) )
self.view.maybe_downsample_graphics()
view._set_yrange() if do_ds:
self.view.maybe_downsample_graphics()
view._set_yrange()
try: try:
self.linked.graphics_cycle() self.linked.graphics_cycle()
except IndexError: except IndexError:
@ -1260,7 +1269,6 @@ class ChartPlotWidget(pg.PlotWidget):
If ``bars_range`` is provided use that range. If ``bars_range`` is provided use that range.
''' '''
# print(f'Chart[{self.name}].maxmin()')
profiler = pg.debug.Profiler( profiler = pg.debug.Profiler(
msg=f'`{str(self)}.maxmin(name={name})`: `{self.name}`', msg=f'`{str(self)}.maxmin(name={name})`: `{self.name}`',
disabled=not pg_profile_enabled(), disabled=not pg_profile_enabled(),
@ -1294,13 +1302,15 @@ class ChartPlotWidget(pg.PlotWidget):
res = flow.maxmin(*key) res = flow.maxmin(*key)
if ( if (
res is None or res is None
res == (None, None)
): ):
log.error( log.warning(
f"{flow_key} no mxmn for bars_range => {key} !?" f"{flow_key} no mxmn for bars_range => {key} !?"
) )
res = 0, 0 res = 0, 0
if not self._on_screen:
self.default_view(do_ds=False)
self._on_screen = True
profiler(f'yrange mxmn: {key} -> {res}') profiler(f'yrange mxmn: {key} -> {res}')
# print(f'{flow_key} yrange mxmn: {key} -> {res}') # print(f'{flow_key} yrange mxmn: {key} -> {res}')