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Avoid selecting more than one lines at a time #8

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Avoid selecting more than one lines at a time #8

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15 changes: 14 additions & 1 deletion mpl_draggable_line/_line.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
from __future__ import annotations

import math
import threading
from numbers import Real

import numpy as np
Expand All @@ -17,6 +19,9 @@


class DraggableLine(AxesWidget):
active_line, min_dist = None, math.inf
lock = threading.Lock()

def __init__(
self,
ax,
Expand Down Expand Up @@ -132,7 +137,13 @@ def _on_press(self, event: MouseEvent):
dist = np.hypot(*diff.T)
idx = np.argmin(dist)
if dist[idx] < self._grab_range:
self._handle_idx = idx
with DraggableLine.lock:
if dist[idx] < DraggableLine.min_dist:
if DraggableLine.active_line is not None:
DraggableLine.active_line._handle_idx = None
self._handle_idx = idx
DraggableLine.min_dist = dist[idx]
DraggableLine.active_line = self

else:
self._handle_idx = None
Expand Down Expand Up @@ -163,6 +174,8 @@ def _on_move(self, event: MouseEvent):

def _on_release(self, event: MouseEvent):
self._handle_idx = None
with DraggableLine.lock:
DraggableLine.active_line, DraggableLine.min_dist = None, math.inf

def on_line_changed(self, func):
"""
Expand Down