ViewWidget.qml

import QtQuick 2.2
import QtQuick.Controls 1.2
import QtQuick.Controls.Styles 1.2

import QGroundControl.Palette 1.0
import QGroundControl.Controllers 1.0

Rectangle {
	property Component connectedComponent: __componentConnected
	property Component disconnectedComponent: __componentDisconnected

	QGCPalette { id: __qgcPal; colorGroupEnabled: enabled }
	ViewWidgetController { id: __controller }

	color: __qgcPal.window

	Component.onCompleted: __controller.checkForVehicle()

	Connections {
		target: __controller

		onPluginConnected: {
			pageLoader.autopilot = autopilot
			pageLoader.sourceComponent = connectedComponent
		}

		onPluginDisconnected: {
            pageLoader.sourceComponent = null
			pageLoader.sourceComponent = disconnectedComponent
			pageLoader.autopilot = null
		}
	}

	Loader {
		id: pageLoader

		anchors.fill: parent

		property var autopilot

		sourceComponent: __componentDisconnected
	}

	Component {
		id: __componentConnected

		Rectangle {
			QGCPalette { id: __qgcPal; colorGroupEnabled: enabled }

			anchors.fill:	parent
			color:			__qgcPal.window

			QGCLabel {
				anchors.fill:	parent

				horizontalAlignment:	Text.AlignHCenter
				verticalAlignment:		Text.AlignVCenter

				text: "missing connected implementation"
			}
		}
	}

	Component {
		id: __componentDisconnected

		Rectangle {
			QGCPalette { id: __qgcPal; colorGroupEnabled: enabled }

			anchors.fill:	parent
			color:			__qgcPal.window

			QGCLabel {
				anchors.fill:	parent

				horizontalAlignment:	Text.AlignHCenter
				verticalAlignment:		Text.AlignVCenter

				text: "no vehicle connected"
			}
		}
	}
}