Using modified signal in the calculator example

Author: zmoth

examples/calculator/main.cpp

@@ -77,8 +77,12 @@ int main(int argc, char *argv[])
 
     auto menuBar = new QMenuBar();
     QMenu *menu = menuBar->addMenu("File");
+
     auto saveAction = menu->addAction("Save Scene");
+    saveAction->setShortcut(QKeySequence::Save);
+
     auto loadAction = menu->addAction("Load Scene");
+    loadAction->setShortcut(QKeySequence::Open);
 
     QVBoxLayout *l = new QVBoxLayout(&mainWidget);
 
@@ -92,13 +96,20 @@ int main(int argc, char *argv[])
     l->setContentsMargins(0, 0, 0, 0);
     l->setSpacing(0);
 
-    QObject::connect(saveAction, &QAction::triggered, scene, &DataFlowGraphicsScene::save);
+    QObject::connect(saveAction, &QAction::triggered, scene, [scene, &mainWidget]() {
+        if (scene->save())
+            mainWidget.setWindowModified(false);
+    });
 
     QObject::connect(loadAction, &QAction::triggered, scene, &DataFlowGraphicsScene::load);
 
     QObject::connect(scene, &DataFlowGraphicsScene::sceneLoaded, view, &GraphicsView::centerScene);
 
-    mainWidget.setWindowTitle("Data Flow: simplest calculator");
+    QObject::connect(scene, &DataFlowGraphicsScene::modified, &mainWidget, [&mainWidget]() {
+        mainWidget.setWindowModified(true);
+    });
+
+    mainWidget.setWindowTitle("[*]Data Flow: simplest calculator");
     mainWidget.resize(800, 600);
     // Center window.
     mainWidget.move(QApplication::primaryScreen()->availableGeometry().center()

include/QtNodes/internal/DataFlowGraphicsScene.hpp

@@ -26,9 +26,9 @@ class NODE_EDITOR_PUBLIC DataFlowGraphicsScene : public BasicGraphicsScene
     QMenu *createSceneMenu(QPointF const scenePos) override;
 
 public Q_SLOTS:
-    void save() const;
+    bool save() const;
 
-    void load();
+    bool load();
 
 Q_SIGNALS:
     void sceneLoaded();

src/DataFlowGraphicsScene.cpp

@@ -144,7 +144,7 @@ QMenu *DataFlowGraphicsScene::createSceneMenu(QPointF const scenePos)
     return modelMenu;
 }
 
-void DataFlowGraphicsScene::save() const
+bool DataFlowGraphicsScene::save() const
 {
     QString fileName = QFileDialog::getSaveFileName(nullptr,
                                                     tr("Open Flow Scene"),
@@ -158,24 +158,26 @@ void DataFlowGraphicsScene::save() const
         QFile file(fileName);
         if (file.open(QIODevice::WriteOnly)) {
             file.write(QJsonDocument(_graphModel.save()).toJson());
+            return true;
         }
     }
+    return false;
 }
 
-void DataFlowGraphicsScene::load()
+bool DataFlowGraphicsScene::load()
 {
     QString fileName = QFileDialog::getOpenFileName(nullptr,
                                                     tr("Open Flow Scene"),
                                                     QDir::homePath(),
                                                     tr("Flow Scene Files (*.flow)"));
 
     if (!QFileInfo::exists(fileName))
-        return;
+        return false;
 
     QFile file(fileName);
 
     if (!file.open(QIODevice::ReadOnly))
-        return;
+        return false;
 
     clearScene();
 
@@ -184,6 +186,8 @@ void DataFlowGraphicsScene::load()
     _graphModel.load(QJsonDocument::fromJson(wholeFile).object());
 
     Q_EMIT sceneLoaded();
+
+    return true;
 }
 
 } // namespace QtNodes