add book

Qt6QMLBeginnersCode/4.SignalsSlots/3-PropertChangeSignals/Main.qml

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+// Copyright (c) Daniel Gakwaya.
+// SPDX-License-Identifier: MIT
+
+import QtQuick
+
+Window {
+    width: 640
+    height: 480
+    visible: true
+    title: qsTr("Property change handlers")
+
+    Rectangle {
+        id: rect
+        width: 300
+        height: width
+        color: "dodgerblue"
+
+        property string description: "A rectangle to play with"
+
+        onWidthChanged: function() {
+            console.log("Width changed to: " + rect.width)
+        }
+
+        onHeightChanged: function() {
+            console.log("Height changed to: " + rect.height)
+        }
+
+        onColorChanged: {
+
+        }
+
+        onVisibleChanged: {
+
+        }
+
+        onDescriptionChanged: {
+
+        }
+
+        MouseArea {
+            anchors.fill: parent
+            onClicked: {
+                rect.width = rect.width + 20
+            }
+        }
+    }
+}