add book

Qt6QMLBeginnersCode/4.SignalsSlots/10-MultipleSignalParameters/CMakeLists.txt

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+# Copyright (c) Daniel Gakwaya.
+# SPDX-License-Identifier: MIT
+
+cmake_minimum_required(VERSION 3.16)
+
+project(10-MultipleSignalParameters 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(app10-MultipleSignalParameters
+    main.cpp
+)
+
+qt_add_qml_module(app10-MultipleSignalParameters
+    URI 10-MultipleSignalParameters
+    VERSION 1.0
+    QML_FILES Main.qml
+)
+
+set_target_properties(app10-MultipleSignalParameters 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(app10-MultipleSignalParameters
+    PRIVATE Qt6::Quick
+)
+
+install(TARGETS app10-MultipleSignalParameters
+    BUNDLE DESTINATION .
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)

Qt6QMLBeginnersCode/4.SignalsSlots/10-MultipleSignalParameters/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("Multiple Signal Parameters")
+
+    signal info(string last_name,string first_name,int age)
+
+    //Handle all three parameters
+    onInfo: function(l,f,a){
+        print("last name: " + l + ", first name: " + f +", age: "+ a)
+    }
+
+    //Only handle the first two
+    /*
+    onInfo: function(l,f){
+        print("last name: " + l + ", first name: " + f)
+    }
+    */
+    //Only handle the first one
+    /*
+    onInfo: function(l){
+        print("last name: " +l)
+    }
+    */
+    //Can only omit trailling parameters. Can't only ignore last name
+    /*
+    onInfo: function(f,a){
+        print(" first name: " + f +", age: "+ a)
+    }
+    */
+    //Non trailling parameters can be ignored through some hack
+    /*
+    onInfo: function(_,f,a){
+        print(" first name: " + f +", age: "+ a)
+    }
+    */
+    Rectangle{
+        id: rectId
+        width: 300;
+        height: 300
+        color: "blue"
+
+        MouseArea{
+            anchors.fill: parent
+            onClicked: {
+                info("John", "Snow", 33)
+            }
+        }
+    }
+}

Qt6QMLBeginnersCode/4.SignalsSlots/10-MultipleSignalParameters/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("10-MultipleSignalParameters", "Main");
+
+    return app.exec();
+}