Add a PoC of moving vertices in the visualisation

This implementation is really barebones, mostly-broken (each vertex can
only remember one line), but demonstrates that implementing moving is
going to be quite simple.

birdvisu/visualisation/annotators.py

@@ -9,6 +9,7 @@ from dataclasses import dataclass
 import re
 import random
 from PySide6 import QtCore, QtGui, QtWidgets
+from .qt_widgets import MyGraphicsRectItem
 
 # Classification
 
@@ -140,7 +141,7 @@ def create_qgritems(at):
 		x = pos.x
 		y = pos.y
 
-		shape = QtWidgets.QGraphicsRectItem(-size/2, -size/2, size, size)
+		shape = MyGraphicsRectItem(-size/2, -size/2, size, size)
 		shape.setBrush(brush)
 		shape.setPos(x, y)
 		shape.setToolTip(rk)
@@ -149,6 +150,7 @@ def create_qgritems(at):
 		# Centering:
 		text_width = label.boundingRect().width()
 		label.setX(-text_width/2)
+		shape.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable | QtWidgets.QGraphicsItem.ItemIsSelectable)
 		at.router_annotations[rk].append(shape)
 
 	for nk, n in topo.networks.items():
@@ -166,7 +168,7 @@ def create_qgritems(at):
 		x = pos.x
 		y = pos.y
 
-		shape = QtWidgets.QGraphicsRectItem(-size/2, -size/2, size, size)
+		shape = MyGraphicsRectItem(-size/2, -size/2, size, size)
 		shape.setBrush(brush)
 		shape.setPos(x, y)
 		shape.setToolTip(nk)
@@ -175,6 +177,7 @@ def create_qgritems(at):
 		# Centering:
 		text_width = label.boundingRect().width()
 		label.setX(-text_width/2)
+		shape.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable | QtWidgets.QGraphicsItem.ItemIsSelectable)
 		at.network_annotations[nk].append(shape)
 
 	for lk, l in topo.links.items():
@@ -183,16 +186,24 @@ def create_qgritems(at):
 
 		rpos = None
 		for tag in at.router_annotations[rid][-1::-1]:
+			if isinstance(tag, QtWidgets.QGraphicsRectItem):
+				ritem = tag
 			if isinstance(tag, Position):
 				rpos = tag
 				break
 		npos = None
 		for tag in at.network_annotations[nid][-1::-1]:
+			if isinstance(tag, QtWidgets.QGraphicsRectItem):
+				nitem = tag
 			if isinstance(tag, Position):
 				npos = tag
 				break
 
 		line = QtWidgets.QGraphicsLineItem(rpos.x, rpos.y, npos.x, npos.y)
+		ritem.setData(0, line)
+		nitem.setData(0, line)
+		line.setData(0, nitem)
+		line.setData(1, ritem)
 		at.link_annotations[lk].append(line)
 	return at
 

birdvisu/visualisation/qt_widgets.py

@@ -0,0 +1,23 @@
+from PySide6.QtWidgets import QGraphicsRectItem
+from PySide6.QtCore import QLineF
+
+class MyGraphicsRectItem(QGraphicsRectItem):
+	#def __init__(self, *a, **kwa):
+	#	return super().__init__(*a, **kwa)
+	#def itemChange(self, change, val):
+	#	return super().itemChange(change, val)
+	def mouseMoveEvent(self, evt):
+		print(f'Moving: {self}')
+		line = self.data(0)
+		other_end = line.data(0)
+		if other_end == self:
+			other_end = line.data(1)
+		new_qlinef = QLineF(
+			self.x(),
+			self.y(),
+			other_end.x(),
+			other_end.y(),
+			)
+		line.setLine(new_qlinef)
+		return super().mouseMoveEvent(evt)
+