[widgets][toolchaineditor] refactor item deletion/added connection selection/connection deletion

beat/editor/widgets/toolchaineditor.py

@@ -289,10 +289,22 @@ class Connection(QGraphicsPathItem):
 
         self.set_style(style)
 
+    def itemChange(self, change, value):
+        if change == self.ItemSelectedChange:
+            if value:
+                color = QColor("red")
+            else:
+                color = QColor(*self.connection_color)
+            pen = self.pen()
+            pen.setColor(color)
+            self.setPen(pen)
+        return QGraphicsItem.itemChange(self, change, value)
+
     def set_style(self, config):
 
         # Highlight
         self.setAcceptHoverEvents(True)
+        self.setFlag(QGraphicsItem.ItemIsSelectable, True)
 
         # Geometry and color settings
         self.connection_color = config["color"]
@@ -1321,7 +1333,7 @@ class ToolchainView(QGraphicsView):
         """Focus on the toolchain when F key pressed"""
         if event.key() == Qt.Key_F:
             self.custom_focus()
-        if event.key() == Qt.Key_D:
+        if event.key() == Qt.Key_Backspace or event.key() == Qt.Key_Delete:
             self.delete_blocks()
 
     def custom_focus(self):
@@ -1351,41 +1363,45 @@ class ToolchainView(QGraphicsView):
 
     def delete_blocks(self):
         """Custom deletion on toolchain"""
-        selected_blocks = self.scene().selectedItems()
-        if selected_blocks:
-            details = {}
-            for block in selected_blocks:
-                num_connections = 0
-                for connection in self.toolchain.connections:
-                    if (
-                        block.name == connection.start_block_name
-                        or block.name == connection.end_block_name
-                    ):
-                        num_connections += 1
-                if num_connections > 0:
-                    details["block"] = num_connections
-            if len(details.keys()):
-                warning = QMessageBox()
-                warning.setIcon(QMessageBox.Warning)
-                warning.setWindowTitle(self.tr("Deleting connected block"))
-                warning.setInformativeText(
-                    self.tr("You can't delete a connected block!")
-                )
-                warning.setStandardButtons(QMessageBox.Ok)
-                warning.exec_()
-            else:
-                for block in selected_blocks:
-                    if block.type == BlockType.DATASETS.name:
+
+        selected_items = self.scene().selectedItems()
+        if selected_items:
+            for item in selected_items:
+                if isinstance(item, Connection):
+                    self.toolchain.connections.remove(item)
+                    self.scene().removeItem(item)
+                    self.toolchain.dataChanged.emit()
+                elif isinstance(item, Block):
+                    num_connections = 0
+                    for connection in self.toolchain.connections:
                         if (
-                            block.name
-                            in self.toolchain.web_representation["channel_colors"]
+                            item.name == connection.start_block_name
+                            or item.name == connection.end_block_name
                         ):
-                            self.toolchain.web_representation["channel_colors"].pop(
-                                block.name
-                            )
-                    self.toolchain.blocks.remove(block)
-                    self.scene().removeItem(block)
-                self.toolchain.dataChanged.emit()
+                            num_connections += 1
+                    if num_connections > 0:
+                        warning = QMessageBox()
+                        warning.setIcon(QMessageBox.Warning)
+                        warning.setWindowTitle(self.tr("Deleting connected block"))
+                        warning.setInformativeText(
+                            self.tr("You can't delete a connected block!")
+                        )
+                        warning.setStandardButtons(QMessageBox.Ok)
+                        warning.exec_()
+                    else:
+                        if item.type == BlockType.DATASETS.name:
+                            if (
+                                item.name
+                                in self.toolchain.web_representation["channel_colors"]
+                            ):
+                                self.toolchain.web_representation["channel_colors"].pop(
+                                    item.name
+                                )
+                        self.toolchain.web_representation["blocks"].pop(item.name)
+
+                        self.toolchain.blocks.remove(item)
+                        self.scene().removeItem(item)
+                        self.toolchain.dataChanged.emit()
 
 
 class Toolchain(QWidget):