qt 6.5.1 original

examples/widgets/tutorials/modelview/7_selections/7_selections.pro

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+TARGET = mv_selections
+TEMPLATE = app
+QT += widgets
+requires(qtConfig(treeview))
+SOURCES += main.cpp \
+    mainwindow.cpp
+HEADERS += mainwindow.h 
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tutorials/modelview/7_selections
+INSTALLS += target

examples/widgets/tutorials/modelview/7_selections/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(mv_selections LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/tutorials/modelview/7_selections")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(mv_selections
+    main.cpp
+    mainwindow.cpp mainwindow.h
+)
+
+set_target_properties(mv_selections PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(mv_selections PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS mv_selections
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/tutorials/modelview/7_selections/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+#include "mainwindow.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+    return a.exec();
+}

examples/widgets/tutorials/modelview/7_selections/mainwindow.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+//! [quoting modelview_a]
+#include "mainwindow.h"
+
+#include <QTreeView>
+#include <QStandardItemModel>
+#include <QItemSelectionModel>
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , treeView(new QTreeView(this))
+    , standardModel(new QStandardItemModel(this))
+{
+    setCentralWidget(treeView);
+    auto *rootNode = standardModel->invisibleRootItem();
+
+
+    // defining a couple of items
+    auto *americaItem = new QStandardItem("America");
+    auto *mexicoItem =  new QStandardItem("Canada");
+    auto *usaItem =     new QStandardItem("USA");
+    auto *bostonItem =  new QStandardItem("Boston");
+    auto *europeItem =  new QStandardItem("Europe");
+    auto *italyItem =   new QStandardItem("Italy");
+    auto *romeItem =    new QStandardItem("Rome");
+    auto *veronaItem =  new QStandardItem("Verona");
+
+    // building up the hierarchy
+    rootNode->    appendRow(americaItem);
+    rootNode->    appendRow(europeItem);
+    americaItem-> appendRow(mexicoItem);
+    americaItem-> appendRow(usaItem);
+    usaItem->     appendRow(bostonItem);
+    europeItem->  appendRow(italyItem);
+    italyItem->   appendRow(romeItem);
+    italyItem->   appendRow(veronaItem);
+
+    // register the model
+    treeView->setModel(standardModel);
+    treeView->expandAll();
+
+    // selection changes shall trigger a slot
+    QItemSelectionModel *selectionModel = treeView->selectionModel();
+    connect(selectionModel, &QItemSelectionModel::selectionChanged,
+            this, &MainWindow::selectionChangedSlot);
+}
+//! [quoting modelview_a]
+
+//------------------------------------------------------------------------------------
+
+//! [quoting modelview_b]
+void MainWindow::selectionChangedSlot(const QItemSelection & /*newSelection*/, const QItemSelection & /*oldSelection*/)
+{
+    // get the text of the selected item
+    const QModelIndex index = treeView->selectionModel()->currentIndex();
+    QString selectedText = index.data(Qt::DisplayRole).toString();
+    // find out the hierarchy level of the selected item
+    int hierarchyLevel = 1;
+    QModelIndex seekRoot = index;
+    while (seekRoot.parent().isValid()) {
+        seekRoot = seekRoot.parent();
+        hierarchyLevel++;
+    }
+    QString showString = QString("%1, Level %2").arg(selectedText)
+                         .arg(hierarchyLevel);
+    setWindowTitle(showString);
+}
+//! [quoting modelview_b]
+
+

examples/widgets/tutorials/modelview/7_selections/mainwindow.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE
+class QTreeView; // forward declarations
+class QStandardItemModel;
+class QItemSelection;
+QT_END_NAMESPACE
+
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+
+private slots:
+    void selectionChangedSlot(const QItemSelection &newSelection, const QItemSelection &oldSelection);
+
+private:
+    QTreeView *treeView;
+    QStandardItemModel *standardModel;
+};
+
+#endif // MAINWINDOW_H