Add a C++ example that demonstrates the use of libqmenumodel.

3 files changed, 121 insertions, 2 deletions

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
new file mode 100644
index 0000000..028c6ef
--- /dev/null
+++ b/examples/CMakeLists.txt
@@ -0,0 +1,20 @@
+# Standalone CMakeLists.txt to generate the info-menumodel executable.
+# This is not built as part of libqmenumodel, it has to be built separately
+# and it assumes libqmenumodel-dev is installed on the system.
+
+cmake_minimum_required(VERSION 2.8.9)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+set(CMAKE_AUTOMOC ON)
+
+find_package(Qt5Core REQUIRED)
+
+include(FindPkgConfig)
+pkg_check_modules(QMENUMODEL REQUIRED qmenumodel)
+
+add_executable(info-menumodel info-menumodel.cpp)
+
+qt5_use_modules(info-menumodel Core)
+include_directories(${QMENUMODEL_INCLUDE_DIRS})
+target_link_libraries(info-menumodel ${QMENUMODEL_LDFLAGS})
+
diff --git a/examples/README b/examples/README
index 1ecac0e..ab683f3 100644
--- a/examples/README
+++ b/examples/README
@@ -1,11 +1,23 @@
 This directory contains examples that demonstrate how to use the QMenuModel
-QML binding in applications.
+binding in Qt and QML applications.
+
 
 To export an example menu model on the bus, run 'exportmenu.py'.
 
+
 To render this menu in a QML application, run 'render-menumodel.qml' in
 qmlscene. You will need to inform qmlscene of the location of the QMenuModel
 plugin if it’s not installed system-wide, e.g.:
 
-    qmlscene -I libqmenumodel examples/render-menumodel.qml
+    $ qmlscene -I libqmenumodel examples/render-menumodel.qml
+
+
+To compile a C++ executable that uses libqmenumodel to monitor and print
+information about the exported menu, run `cmake` and then `make` from this
+directory. This assumes that libqmenumodel-dev is installed on the system
+(it won’t work with a local copy). Then, run the executable generated:
+
+    $ cmake .
+    $ make
+    $ ./info-menumodel
 
diff --git a/examples/info-menumodel.cpp b/examples/info-menumodel.cpp
new file mode 100644
index 0000000..d370731
--- /dev/null
+++ b/examples/info-menumodel.cpp
@@ -0,0 +1,87 @@
+/*
+ * Example executable that links against libqmenumodel to monitor
+ * and print information about a menu model exported on D-Bus.
+ */
+
+// QMenuModel
+#include "qmenumodel/qdbusmenumodel.h"
+
+// stdlib
+#include <iostream>
+
+// Qt
+#include <QtCore/QCoreApplication>
+#include <QtCore/QObject>
+
+
+#define BUS_NAME "com.canonical.testmenu"
+#define BUS_OBJECT_PATH "/com/canonical/testmenu"
+
+
+class MenuModelMonitor : public QDBusMenuModel
+{
+    Q_OBJECT
+
+public:
+    MenuModelMonitor(QObject* parent=0)
+        : QDBusMenuModel(parent)
+    {
+        setProperty("busType", DBusEnums::SessionBus);
+        setProperty("busName", BUS_NAME);
+        setProperty("objectPath", BUS_OBJECT_PATH);
+        QObject::connect(this, SIGNAL(statusChanged(DBusEnums::ConnectionStatus)),
+                         SLOT(onStatusChanged(DBusEnums::ConnectionStatus)));
+        QObject::connect(this, SIGNAL(rowsInserted(const QModelIndex&, int, int)),
+                         SLOT(onModelChanged()));
+        QObject::connect(this, SIGNAL(rowsRemoved(const QModelIndex&, int, int)),
+                         SLOT(onModelChanged()));
+        std::cout << "Monitoring menu model "
+                  << property("objectPath").toString().toUtf8().constData()
+                  << " on the well-known name "
+                  << property("busName").toString().toUtf8().constData()
+                  << std::endl;
+    }
+
+private Q_SLOTS:
+    void onStatusChanged(DBusEnums::ConnectionStatus status)
+    {
+        std::cout << "Status of menu model changed to " << status << std::endl;
+        if (status == DBusEnums::Connected) {
+            printModel(this);
+        }
+    }
+
+    void onModelChanged()
+    {
+        printModel(this);
+    }
+
+private:
+    void printModel(QMenuModel* model, int indent=0)
+    {
+        int count = model->rowCount();
+        for (int i = 0; i < count; ++i) {
+            QModelIndex index = model->index(i, 0);
+            QString label = model->data(index, QMenuModel::Label).toString();
+            QVariant submenu = model->data(index, QMenuModel::LinkSubMenu);
+            for (int j = 0; j < indent * 2; ++j) std::cout << " ";
+            std::cout << " > " << label.toUtf8().constData() << std::endl;
+            if (submenu.isValid()) {
+                printModel(qobject_cast<QMenuModel*>(submenu.value<QObject*>()), indent + 1);
+            }
+        }
+    }
+};
+
+#include "info-menumodel.moc"
+
+
+int main(int argc, char** argv)
+{
+    MenuModelMonitor monitor;
+    monitor.start();
+    int result = QCoreApplication(argc, argv).exec();
+    monitor.stop();
+    return result;
+}
+