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Snap level line movements to tick size

basic_orders
Tyler Goodlet 2021-03-07 22:16:46 -05:00
parent d58a82bd38
commit fff9efe4aa
1 changed files with 18 additions and 5 deletions
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23
piker/ui/_graphics/_lines.py
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@ -22,6 +22,7 @@ from typing import Tuple, Optional, List
import pyqtgraph as pg import pyqtgraph as pg
from PyQt5 import QtCore, QtGui from PyQt5 import QtCore, QtGui
from PyQt5.QtCore import QPointF
from .._label import Label, vbr_left, right_axis from .._label import Label, vbr_left, right_axis
from .._style import ( from .._style import (
@ -91,6 +92,8 @@ class LevelLine(pg.InfiniteLine):
self._on_drag_start = lambda l: None self._on_drag_start = lambda l: None
self._on_drag_end = lambda l: None self._on_drag_end = lambda l: None
self._y_incr_mult = 1 / chart._lc._symbol.tick_size
# testing markers # testing markers
# self.addMarker('<|', 0.1, 3) # self.addMarker('<|', 0.1, 3)
# self.addMarker('<|>', 0.2, 3) # self.addMarker('<|>', 0.2, 3)
@ -298,21 +301,31 @@ class LevelLine(pg.InfiniteLine):
# XXX: normal tracking behavior pulled out from parent type # XXX: normal tracking behavior pulled out from parent type
if self.movable and ev.button() == QtCore.Qt.LeftButton: if self.movable and ev.button() == QtCore.Qt.LeftButton:
ev.accept()
if ev.isStart(): if ev.isStart():
self.moving = True self.moving = True
self.cursorOffset = self.pos() - self.mapToParent( down_pos = ev.buttonDownPos()
ev.buttonDownPos()) self.cursorOffset = self.pos() - self.mapToParent(down_pos)
self.startPosition = self.pos() self.startPosition = self.pos()
self._on_drag_start(self)
ev.accept() self._on_drag_start(self)
if not self.moving: if not self.moving:
return return
self.setPos(self.cursorOffset + self.mapToParent(ev.pos())) pos = self.cursorOffset + self.mapToParent(ev.pos())
# TODO: we should probably figure out a std api
# for this kind of thing given we already have
# it on the cursor system...
# round to nearest symbol tick
m = self._y_incr_mult
self.setPos(QPointF(pos.x(), round(pos.y() * m) / m))
self.sigDragged.emit(self) self.sigDragged.emit(self)
if ev.isFinish(): if ev.isFinish():
self.moving = False self.moving = False
self.sigPositionChangeFinished.emit(self) self.sigPositionChangeFinished.emit(self)