Very early KDE 6 release.

plasma/plasmoids/io.gitgud.wackyideas.win7showdesktop/contents/ui/lib/AppletVersion.qml

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+import QtQuick 2.15
+import QtQuick.Controls 2.12
+import QtQuick.Layouts 1.3
+
+import org.kde.plasma.plasma5support as Plasma5Support
+import org.kde.plasma.plasmoid
+
+Item {
+	implicitWidth: label.implicitWidth
+	implicitHeight: label.implicitHeight
+
+	property string version: "?"
+	property string metadataFilepath: Plasmoid.file("", "../metadata.desktop")
+
+	Plasma5Support.DataSource {
+		id: executable
+		engine: "executable"
+		connectedSources: []
+		onNewData: {
+			var exitCode = data["exit code"]
+			var exitStatus = data["exit status"]
+			var stdout = data["stdout"]
+			var stderr = data["stderr"]
+			exited(exitCode, exitStatus, stdout, stderr)
+			disconnectSource(sourceName) // cmd finished
+		}
+		function exec(cmd) {
+			connectSource(cmd)
+		}
+		signal exited(int exitCode, int exitStatus, string stdout, string stderr)
+	}
+
+	Connections {
+		target: executable
+		function onExited() {
+			version = stdout.replace('\n', ' ').trim()
+		}
+	}
+
+	Label {
+		id: label
+		text: i18n("<b>Version:</b> %1", version)
+	}
+
+	Component.onCompleted: {
+		var cmd = 'kreadconfig6 --file "' + metadataFilepath + '" --group "Desktop Entry" --key "X-KDE-PluginInfo-Version"'
+		executable.exec(cmd)
+	}
+
+}

plasma/plasmoids/io.gitgud.wackyideas.win7showdesktop/contents/ui/lib/ConfigCheckBox.qml

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+import QtQuick 2.15
+import QtQuick.Controls 2.12
+import QtQuick.Layouts 1.3
+
+import org.kde.plasma.core as PlasmaCore
+import org.kde.plasma.components as PlasmaComponents
+
+import org.kde.plasma.plasmoid
+
+import ".."
+
+CheckBox {
+	id: configCheckBox
+
+	property string configKey: ''
+	checked: Plasmoid.configuration[configKey]
+	onClicked: Plasmoid.configuration[configKey] = !Plasmoid.configuration[configKey]
+}

plasma/plasmoids/io.gitgud.wackyideas.win7showdesktop/contents/ui/lib/ConfigColor.qml

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+import QtQuick 2.15
+import QtQuick.Controls 2.12
+import QtQuick.Layouts 1.3
+import QtQuick.Dialogs
+import QtQuick.Window 2.12
+
+import org.kde.plasma.core as PlasmaCore
+import org.kde.plasma.components as PlasmaComponents
+import org.kde.kirigami as Kirigami
+
+import org.kde.plasma.plasmoid
+
+import ".."
+
+RowLayout {
+	id: configColor
+	spacing: 2
+	// Layout.fillWidth: true
+	Layout.maximumWidth: 300
+
+	property alias label: label.text
+	property alias horizontalAlignment: label.horizontalAlignment
+
+	property string configKey: ''
+	property string defaultColor: ''
+	property string value: {
+		if (configKey) {
+			return Plasmoid.configuration[configKey]
+		} else {
+			return "#000"
+		}
+	}
+
+	readonly property color defaultColorValue: defaultColor
+	readonly property color valueColor: {
+		if (value == '' && defaultColor) {
+			return defaultColor
+		} else {
+			return value
+		}
+	}
+
+	onValueChanged: {
+		if (!textField.activeFocus) {
+			textField.text = configColor.value
+		}
+		if (configKey) {
+			if (value == defaultColorValue) {
+				Plasmoid.configuration[configKey] = ""
+			} else {
+				Plasmoid.configuration[configKey] = value
+			}
+		}
+	}
+
+	function setValue(newColor) {
+		textField.text = newColor
+	}
+
+	Label {
+		id: label
+		text: "Label"
+		Layout.fillWidth: horizontalAlignment == Text.AlignRight
+		horizontalAlignment: Text.AlignLeft
+	}
+
+	MouseArea {
+		id: mouseArea
+		width: textField.height
+		height: textField.height
+		hoverEnabled: true
+
+		onClicked: dialog.open()
+
+		Rectangle {
+			anchors.fill: parent
+			color: configColor.valueColor
+			border.width: 2
+			border.color: parent.containsMouse ? Kirigami.Theme.highlightColor : "#BB000000"
+		}
+	}
+
+	TextField {
+		id: textField
+		placeholderText: defaultColor ? defaultColor : "#AARRGGBB"
+		Layout.fillWidth: label.horizontalAlignment == Text.AlignLeft
+		onTextChanged: {
+			// Make sure the text is:
+			//   Empty (use default)
+			//   or #123 or #112233 or #11223344 before applying the color.
+			if (text.length === 0
+				|| (text.indexOf('#') === 0 && (text.length == 4 || text.length == 7 || text.length == 9))
+			) {
+				configColor.value = text
+			}
+		}
+	}
+
+	ColorDialog {
+		id: dialog
+		visible: false
+		modality: Qt.WindowModal
+		title: configColor.label
+		flags: ColorDialog.ShowAlphaChannel
+		selectedColor: configColor.valueColor
+		onAccepted: {
+			configColor.value = selectedColor
+		}
+	}
+}

plasma/plasmoids/io.gitgud.wackyideas.win7showdesktop/contents/ui/lib/ConfigPage.qml

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+// Version 4
+
+import QtQuick 2.15
+import QtQuick.Layouts 1.3
+
+import org.kde.kcmutils as KCM
+
+KCM.SimpleKCM {
+	id: page
+	Layout.fillWidth: true
+	default property alias _contentChildren: content.data
+	implicitHeight: content.implicitHeight
+
+	ColumnLayout {
+		id: content
+		anchors.left: parent.left
+		anchors.right: parent.right
+		anchors.top: parent.top
+
+		// Workaround for crash when using default on a Layout.
+		// https://bugreports.qt.io/browse/QTBUG-52490
+		// Still affecting Qt 5.7.0
+		Component.onDestruction: {
+			while (children.length > 0) {
+				children[children.length - 1].parent = page
+			}
+		}
+	}
+
+	property alias showAppletVersion: appletVersionLoader.active
+	Loader {
+		id: appletVersionLoader
+		active: false
+		visible: active
+		source: "AppletVersion.qml"
+		anchors.right: parent.right
+		anchors.bottom: parent.top
+	}
+}

plasma/plasmoids/io.gitgud.wackyideas.win7showdesktop/contents/ui/lib/ConfigSection.qml

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+import QtQuick 2.15
+import QtQuick.Controls 2.12
+import QtQuick.Layouts 1.3
+
+GroupBox {
+	id: configSection
+	Layout.fillWidth: true
+	default property alias _contentChildren: content.data
+
+	ColumnLayout {
+		id: content
+		anchors.left: parent.left
+		anchors.right: parent.right
+
+		// Workaround for crash when using default on a Layout.
+		// https://bugreports.qt.io/browse/QTBUG-52490
+		// Still affecting Qt 5.7.0
+		Component.onDestruction: {
+			while (children.length > 0) {
+				children[children.length - 1].parent = configSection
+			}
+		}
+	}
+}

plasma/plasmoids/io.gitgud.wackyideas.win7showdesktop/contents/ui/lib/ConfigSpinBox.qml

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+import QtQuick 2.15
+import QtQuick.Controls 2.12
+import QtQuick.Layouts 1.3
+
+import org.kde.plasma.plasmoid
+
+RowLayout {
+	id: configSpinBox
+
+	property string configKey: ''
+	property alias to: spinBox.to
+	property alias from: spinBox.from
+	property alias prefix: spinBox.prefix
+	property alias stepSize: spinBox.stepSize
+	property alias suffix: spinBox.suffix
+	property alias value: spinBox.value
+
+	property alias before: labelBefore.text
+	property alias after: labelAfter.text
+
+	Label {
+		id: labelBefore
+		text: ""
+		visible: text
+	}
+
+	SpinBox {
+		id: spinBox
+
+		property string prefix
+		property string suffix
+
+		value: Plasmoid.configuration[configKey]
+		// onValueChanged: Plasmoid.configuration[configKey] = value
+		onValueChanged: serializeTimer.start()
+		to: 2147483647
+
+		textFromValue: function(value) {
+			return prefix + value + suffix;
+		}
+	}
+
+	Label {
+		id: labelAfter
+		text: ""
+		visible: text
+	}
+
+	Timer { // throttle
+		id: serializeTimer
+		interval: 300
+		onTriggered: Plasmoid.configuration[configKey] = value
+	}
+}