I have a PyQGIS script, which dynamically creates a print layout and opens it in the layout designer, when finished (example below). It works without problems when executed from the console. Now I want to integrate it into my scripts in the processing toolbox. Executed from the processing script, which was previously also running well, the same procedure causes problems and ultimately crashes QGIS. I have opened an issue on Github for this and have received the answer that this is not a QGIS error but that my script is not thread safe.
Does anybody know a way to accomplish my objective in processing scripts?
project = context.project()
manager = project.layoutManager()
layout = QgsPrintLayout(project)
layout.initializeDefaults()
layout.setName('Layout Name')
pages = layout.pageCollection()
pages.beginPageSizeChange()
page = pages.page(0)
page.setPageSize('A4')
pages.endPageSizeChange()
page_center = page.pageSize().width() / 2
title = QgsLayoutItemLabel(layout)
title.setText('Layout Title')
title.setFont(QFont('arial', 36))
title.adjustSizeToText()
title.setReferencePoint(1)
title.attemptMove(QgsLayoutPoint(page_center, 20))
layout.addItem(title)
map = QgsLayoutItemMap(layout)
map.setRect(20, 20, 20, 20)
ms = QgsMapSettings()
ms.setLayers([catchment])
rect = QgsRectangle(ms.fullExtent())
rect.scale(1.0)
ms.setExtent(rect)
map.setExtent(rect)
map.attemptResize(QgsLayoutSize(180, 90))
map.setReferencePoint(1)
map.attemptMove(QgsLayoutPoint(page_center, 50))
layout.addLayoutItem(map)
table = QgsLayoutItemTextTable(layout)
layout.addMultiFrame(table)
cols = [QgsLayoutTableColumn(), QgsLayoutTableColumn(), QgsLayoutTableColumn()]
cols[0].setHeading('Heading 0')
cols[1].setHeading('Heading 1')
table.setColumns(cols)
table.setContents([['Hello', 'world!']])
frame = QgsLayoutFrame(layout, table)
frame.attemptResize(QgsLayoutSize(30, 30), True)
frame.setReferencePoint(1)
frame.attemptMove(QgsLayoutPoint(page_center, 150))
table.addFrame(frame) # crash point 1
manager.addLayout(layout)
iface.openLayoutDesigner(layout) # crash point 2
