add book

Qt6QMLBeginnersCode/2.DissectingQmlSyntax/3-PropertyBinding/CMakeLists.txt

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+# Copyright (c) Daniel Gakwaya.
+# SPDX-License-Identifier: MIT
+
+cmake_minimum_required(VERSION 3.16)
+
+project(3-PropertyBinding VERSION 0.1 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Qt6 6.5 REQUIRED COMPONENTS Quick)
+
+qt_standard_project_setup(REQUIRES 6.5)
+
+qt_add_executable(app3-PropertyBinding
+    main.cpp
+)
+
+qt_add_qml_module(app3-PropertyBinding
+    URI 3-PropertyBinding
+    VERSION 1.0
+    QML_FILES Main.qml
+)
+
+set_target_properties(app3-PropertyBinding PROPERTIES
+    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
+    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
+    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
+    MACOSX_BUNDLE TRUE
+    WIN32_EXECUTABLE TRUE
+)
+
+target_link_libraries(app3-PropertyBinding
+    PRIVATE Qt6::Quick
+)
+
+install(TARGETS app3-PropertyBinding
+    BUNDLE DESTINATION .
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)

Qt6QMLBeginnersCode/2.DissectingQmlSyntax/3-PropertyBinding/Main.qml

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+// Copyright (c) Daniel Gakwaya.
+// SPDX-License-Identifier: MIT
+
+import QtQuick
+
+Window {
+    visible: true
+    width: 640
+    height: 480
+    title: qsTr("Property Binding Demo")
+
+    Rectangle {
+        id: redRectId
+        width: 50
+        height: width * 1.5
+        color: "red"
+    }
+
+    Rectangle {
+        id: blueRectId
+        color: "blue"
+        width: 100
+        height: 100
+        anchors.bottom: parent.bottom
+
+        MouseArea {
+            anchors.fill: parent
+            onClicked: {
+                redRectId.width = redRectId.width + 10
+            }
+        }
+    }
+
+    Rectangle {
+        id: greenRectId
+        color: "green"
+        width: 100
+        height: 100
+        anchors.bottom: parent.bottom
+        anchors.left: blueRectId.right
+
+        MouseArea {
+            anchors.fill: parent
+            onClicked: {
+                //redRectId.height = 100 // Doesn't work
+                //redRectId.height = redRectId.width * 1.5 // Doesn't work either
+
+                redRectId.height = Qt.binding(function() {
+                    return redRectId.width * 2
+                })
+            }
+        }
+    }
+}

Qt6QMLBeginnersCode/2.DissectingQmlSyntax/3-PropertyBinding/main.cpp

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+// Copyright (c) Daniel Gakwaya.
+// SPDX-License-Identifier: MIT
+
+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+
+int main(int argc, char *argv[])
+{
+	
+	QGuiApplication app(argc, argv);
+
+    QQmlApplicationEngine engine;
+    QObject::connect(&engine, &QQmlApplicationEngine::objectCreationFailed,
+        &app, []() { QCoreApplication::exit(-1); },
+        Qt::QueuedConnection);
+    engine.loadFromModule("3-PropertyBinding", "Main");
+
+    return app.exec();	
+}