import QtQuick
import QtQuick.Window
import QtQuick.Controls

Window {
	id: root
	visible: true

	width: 640
	height: 480

	property int msgNr: 0

	TreeView {
		id: tree_view

		anchors.fill: parent

		selectionModel: ItemSelectionModel {
			id: selection_model
		}

		model: _tree_proxy_model

		// this works as expected
		//delegate: ItemDelegate {
		//	required property bool selected
		//	required property bool current
		//
		// this does not work as expected (selected item immediately gets unselected)
		delegate: TreeViewDelegate {
			id: delegate

			onClicked: {
				console.log(`${++msgNr}: ${model.display}: onClicked`)

				// OMG why column is the first argument?
				// This is different from QAbstractItemModel::index(int row, int column, ...)
				// This also breaks Qt 6.3 code which used TreeView's modelIndex method which accepted (row, column)
				let idx = tree_view.modelIndex(column, row)

				selection_model.select(idx, ItemSelectionModel.Toggle)

				// commenting this makes no difference
				selection_model.setCurrentIndex(idx, ItemSelectionModel.Current)
			}

			onSelectedChanged: {
				console.log(`${++msgNr}: ${model.display}: onSelectedChanged, selected: ${selected}`)
			}

			onCurrentChanged: {
				console.log(`${++msgNr}: ${model.display}: onCurrentChanged, current: ${current}`)
			}

			contentItem: Text {
				text: model.display
				color: delegate.selected ? "white" : "black"
			}

			background: Rectangle {
				color: delegate.selected ? "navy" : "white"
				border.color: delegate.current ? "navy" : "transparent"
				border.width: delegate.current ? 2 : 0
			}
		}
	}
}

qml: 1: Connection Editing Mode: onClicked
qml: 2: Connection Editing Mode: onSelectedChanged, selected: 1
qml: 3: Connection Editing Mode: onSelectedChanged, selected: 0
qml: 4: Connection Editing Mode: onCurrentChanged, current: 1