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ResolutionsRow: snap to nearest allowed resolution value

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libratbag now exports a list of permitted resolutions rather than a min/max
value (and a guesswork step increment on piper's side). Use that and snap the
resolution slider to the nearest value in that list.

See https://github.com/libratbag/libratbag/pull/393

Related to #186
This commit is contained in:
Peter Hutterer
2017-10-16 09:58:07 +10:00
committed by Jente Hidskes
parent 6f6cacbc35
commit 1f1b43b40a
1 changed files with 25 additions and 4 deletions
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29
piper/resolutionrow.py
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@@ -62,6 +62,7 @@ class ResolutionRow(Gtk.ListBoxRow):
xres, __ = resolution.resolution
minres = resolution.resolutions[0]
maxres = resolution.resolutions[-1]
self.resolutions = resolution.resolutions
self.dpi_label.set_text("{} DPI".format(xres))
self.active_label.set_visible(resolution.is_active)
@@ -75,10 +76,30 @@ class ResolutionRow(Gtk.ListBoxRow):
@GtkTemplate.Callback
def _on_change_value(self, scale, scroll, value):
# Round the value resulting from a scroll event to the nearest multiple
# of 50. This is to work around the Gtk.Scale not snapping to its
# Gtk.Adjustment's step_increment.
scale.set_value(int(value - (value % 50)))
# Cursor-controlled slider may get out of the GtkAdjustment's range
value = min(max(self.resolutions[0], value), self.resolutions[-1])
# Find the nearest permitted value to our Gtk.Scale value
lo = max([r for r in self.resolutions if r <= value])
hi = min([r for r in self.resolutions if r >= value])
if value - lo < hi - value:
value = lo
else:
value = hi
scale.set_value(value)
# libratbag provides a fake-exponential range with the deltas
# increasing as the resolution goes up. Make sure we set our
# steps to the next available value.
idx = self.resolutions.index(value)
if idx < len(self.resolutions) - 1:
delta = self.resolutions[idx + 1] - self.resolutions[idx]
self.scale.props.adjustment.set_step_increment(delta)
self.scale.props.adjustment.set_page_increment(delta)
return True
@GtkTemplate.Callback