|
| 1 | +from typing import * |
| 2 | + |
| 3 | +from . import LinearSelector |
| 4 | + |
| 5 | + |
| 6 | +class Synchronizer: |
| 7 | + def __init__(self, *selectors: LinearSelector, key_bind: str = "Shift"): |
| 8 | + """ |
| 9 | + Synchronize the movement of `Selectors`. Selectors will move in sync only when the selected `"key_bind"` is |
| 10 | + used during the mouse movement event. Valid key binds are: ``"Control"``, ``"Shift"`` and ``"Alt"``. |
| 11 | + If ``key_bind`` is ``None`` then the selectors will always be synchronized. |
| 12 | +
|
| 13 | + Parameters |
| 14 | + ---------- |
| 15 | + selectors |
| 16 | + selectors to synchronize |
| 17 | +
|
| 18 | + key_bind: str, default ``"Shift"`` |
| 19 | + one of ``"Control"``, ``"Shift"`` and ``"Alt"`` |
| 20 | + """ |
| 21 | + self._selectors = list() |
| 22 | + self.key_bind = key_bind |
| 23 | + |
| 24 | + for s in selectors: |
| 25 | + self.add(s) |
| 26 | + |
| 27 | + self.block_event = False |
| 28 | + |
| 29 | + @property |
| 30 | + def selectors(self): |
| 31 | + """Selectors managed by the Synchronizer""" |
| 32 | + return self._selectors |
| 33 | + |
| 34 | + def add(self, selector): |
| 35 | + """add a selector""" |
| 36 | + selector.selection.add_event_handler(self._handle_event) |
| 37 | + self._selectors.append(selector) |
| 38 | + |
| 39 | + def remove(self, selector): |
| 40 | + """remove a selector""" |
| 41 | + self._selectors.remove(selector) |
| 42 | + selector.selection.remove_event_handler(self._handle_event) |
| 43 | + |
| 44 | + def _handle_event(self, ev): |
| 45 | + if self.block_event: |
| 46 | + # because infinite recursion |
| 47 | + return |
| 48 | + |
| 49 | + self.block_event = True |
| 50 | + |
| 51 | + source = ev.pick_info["graphic"] |
| 52 | + delta = ev.pick_info["delta"] |
| 53 | + pygfx_ev = ev.pick_info["pygfx_event"] |
| 54 | + |
| 55 | + # only moves when modifier is used |
| 56 | + if pygfx_ev is None: |
| 57 | + self.block_event = False |
| 58 | + return |
| 59 | + |
| 60 | + if self.key_bind is not None: |
| 61 | + if self.key_bind not in pygfx_ev.modifiers: |
| 62 | + self.block_event = False |
| 63 | + return |
| 64 | + |
| 65 | + if delta is not None: |
| 66 | + self._move_selectors(source, delta) |
| 67 | + |
| 68 | + self.block_event = False |
| 69 | + |
| 70 | + def _move_selectors(self, source, delta): |
| 71 | + for s in self.selectors: |
| 72 | + # must use == and not is to compare Graphics because they are weakref proxies! |
| 73 | + if s == source: |
| 74 | + # if it's the source, since it has already movied |
| 75 | + continue |
| 76 | + |
| 77 | + s._move_graphic(delta) |
| 78 | + |
| 79 | + def __del__(self): |
| 80 | + for s in self.selectors: |
| 81 | + self.remove(s) |
| 82 | + |
| 83 | + self.selectors.clear() |
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