Update qt hello world example

Author: XuhuaHuang

Qt/HelloGUI/.vscode/settings.json

@@ -0,0 +1,4 @@
+{
+    "C_Cpp.default.compileCommands": "${workspaceFolder}/build/compile_commands.json",
+    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools"
+}

Qt/HelloGUI/TestWidget.cpp

@@ -1,38 +1,40 @@
+// clang-format off
 /*****************************************************************//**
  * \file   TestWidget.cpp
- * \brief
+ * \brief  Implementation of the TestWidget class.
  *
  * \author Xuhua Huang
  * \date   February 11, 2021
  *********************************************************************/
+// clang-format on
 
 #include "TestWidget.h"
 
 // TestWidget class constructor
 // pointer parent is passed to parent class constructor
 TestWidget::TestWidget(QWidget* parent)
-    : QWidget(parent) {
-    // instanciate a vertical box layout manager
-    QVBoxLayout* vbox = new QVBoxLayout();
+  : QWidget(parent) {
+  // instanciate a vertical box layout manager
+  QVBoxLayout* vbox = new QVBoxLayout();
 
-    // instantiate a label with "new" keyword and call QLabel constructor
-    label = new QLabel("Hello Qt World");
-    label->setFont(QFont("Times New Roman", 11));
+  // instantiate a label with "new" keyword and call QLabel constructor
+  label = new QLabel("Hello Qt World");
+  label->setFont(QFont("Times New Roman", 11));
 
-    // set the background to green and text to white
-    label->setStyleSheet("QLabel { background-color : green; color : white; }");
+  // set the background to green and text to white
+  label->setStyleSheet("QLabel { background-color : green; color : white; }");
 
-    // create a new label to implement very first hyperlink
-    QLabel* label2 = new QLabel();
-    showHyperlink(label2); // call function
+  // create a new label to implement very first hyperlink
+  label2 = new QLabel();
+  showHyperlink(label2); // call function
 
-    // add the label to the layout manager
-    vbox->addWidget(label);
-    vbox->addWidget(label2); // label2 still exists since it is a pointer
+  // add the label to the layout manager
+  vbox->addWidget(label);
+  vbox->addWidget(label2); // label2 still exists since it is a pointer
 
-    // notice that there can only be one setLayout(): at the end of the
-    // constructor
-    this->setLayout(vbox);
+  // notice that there can only be one setLayout(): at the end of the
+  // constructor
+  this->setLayout(vbox);
 }
 
 // TestWidget class destructor is empty since
@@ -42,8 +44,8 @@ TestWidget::~TestWidget() noexcept {
 
 // content modified by function will stay since it is passed the address
 void TestWidget::showHyperlink(QLabel* const label) {
-    label->setText("<a href=\"www.qt-project.org/\">Get Started With Qt</a>");
-    label->setTextFormat(Qt::RichText);
-    label->setTextInteractionFlags(Qt::TextBrowserInteraction);
-    label->setOpenExternalLinks(true);
+  label->setText("<a href=\"www.qt-project.org/\">Get Started With Qt</a>");
+  label->setTextFormat(Qt::RichText);
+  label->setTextInteractionFlags(Qt::TextBrowserInteraction);
+  label->setOpenExternalLinks(true);
 }

Qt/HelloGUI/TestWidget.h

@@ -1,10 +1,12 @@
+// clang-format off
 /*****************************************************************//**
  * \file   TestWidget.h
- * \brief
+ * \brief  Declaration of the TestWidget class.
  *
  * \author Xuhua Huang
  * \date   February 11, 2021
  *********************************************************************/
+// clang-format on
 
 #ifndef TESTWIDGET_H
 #define TESTWIDGET_H
@@ -14,23 +16,24 @@
 #include <QWidget>
 
 class TestWidget : public QWidget {
-    Q_OBJECT
+  Q_OBJECT
 
 public:
-    // constructor includes a null pointer
-    TestWidget(QWidget* parent = nullptr);
+  // constructor includes a null pointer
+  TestWidget(QWidget* parent = nullptr);
 
-    // destructor
-    ~TestWidget() noexcept;
+  // destructor
+  ~TestWidget() noexcept;
 
 private:
-    // label
-    QLabel* label;
+  // label
+  QLabel* label;
+  QLabel* label2;
 
-    // layout manager
-    QVBoxLayout* vbox;
+  // layout manager
+  QVBoxLayout* vbox;
 
-    void showHyperlink(QLabel* const label);
+  void showHyperlink(QLabel* const label);
 };
 
 #endif // TESTWIDGET_H

Qt/HelloGUI/main.cpp

@@ -0,0 +1,26 @@
+/**
+ * @file main.cpp
+ * @author Xuhua Huang
+ * @brief
+ * @version 0.1
+ * @date 2025-03-23
+ *
+ * @copyright Copyright (c) 2025
+ *
+ */
+
+#include <QApplication>
+#include <QMainWindow>
+
+#include "TestWidget.h"
+
+int main(int argc, char** argv) {
+  QApplication app(argc, argv);
+
+  TestWidget window;
+  window.setFixedSize(400, 300);
+  window.setWindowTitle("Hello Qt GUI");
+  window.show();
+
+  return app.exec();
+}