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libsysprof-ui: pan when selection changes

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This helps keep things in view while moving around.
This commit is contained in:
Christian Hergert
2019-05-15 18:58:22 -07:00
parent aa2772ef87
commit 3210926f15
3 changed files with 80 additions and 6 deletions
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15
src/libsysprof-ui/sysprof-zoom-manager.c
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@ -527,3 +527,18 @@ sysprof_zoom_manager_fit_zoom_for_duration (SysprofZoomManager *self,
return (width / DEFAULT_PIXELS_PER_SEC) / (duration / (gdouble)NSEC_PER_SEC);
}
gdouble
sysprof_zoom_manager_get_offset_at_time (SysprofZoomManager *self,
gint64 offset,
gint width)
{
gint64 full_duration;
gdouble ratio;
g_return_val_if_fail (SYSPROF_IS_ZOOM_MANAGER (self), 0.0);
full_duration = sysprof_zoom_manager_get_duration_for_width (self, width);
ratio = offset / (gdouble)full_duration;
return ratio * width;
}