WIP: Add add printer page, network part

resources/qml/WelcomePages/DropDownWidget.qml

@@ -0,0 +1,78 @@
+// Copyright (c) 2019 Ultimaker B.V.
+// Cura is released under the terms of the LGPLv3 or higher.
+
+import QtQuick 2.10
+import QtQuick.Controls 2.3
+
+import UM 1.3 as UM
+import Cura 1.1 as Cura
+
+
+Item
+{
+    UM.I18nCatalog { id: catalog; name: "cura" }
+
+    id: base
+
+    implicitWidth: 200
+    height: header.contentShown ? childrenRect.height : header.height
+
+    property var contentComponent: null
+
+    property alias title: header.title
+    property alias contentShown: header.contentShown
+
+    DropDownHeader
+    {
+        id: header
+        anchors.top: parent.top
+        anchors.left: parent.left
+        anchors.right: parent.right
+        height: UM.Theme.getSize("expandable_component_content_header").height
+        rightIconSource: contentShown ? UM.Theme.getIcon("arrow_bottom") : UM.Theme.getIcon("arrow_right")
+    }
+
+    Cura.RoundedRectangle
+    {
+        id: contentRectangle
+        anchors.top: header.bottom
+        anchors.horizontalCenter: header.horizontalCenter
+        width: header.width
+        height: childrenRect.height
+
+        border.width: UM.Theme.getSize("default_lining").width
+        border.color: UM.Theme.getColor("lining")
+        color: "white"
+        radius: UM.Theme.getSize("default_radius").width
+        visible: base.contentShown
+        cornerSide: Cura.RoundedRectangle.Direction.Down
+
+        Loader
+        {
+            id: contentLoader
+            anchors.top: parent.top
+            anchors.left: parent.left
+            anchors.right: parent.right
+            height: childrenRect.height
+            anchors.margins: 1
+            sourceComponent: base.contentComponent != null ? base.contentComponent : emptyComponent
+        }
+
+        // This is the empty component/placeholder that will be shown when the widget gets expanded.
+        // It contains a text line "Empty"
+        Component
+        {
+            id: emptyComponent
+
+            Label
+            {
+                text: catalog.i18nc("@label", "Empty")
+                height: UM.Theme.getSize("action_button").height
+                horizontalAlignment: Text.AlignHCenter
+                verticalAlignment: Text.AlignVCenter
+                font: UM.Theme.getFont("medium")
+                renderType: Text.NativeRendering
+            }
+        }
+    }
+}