Adds progress value display feature.

examples/calculator/CMakeLists.txt

@@ -13,6 +13,7 @@ set(CALC_HEADER_FILES
   NumberDisplayDataModel.hpp
   NumberSourceDataModel.hpp
   SubtractionModel.hpp
+  LongProcessingRandomNumber.hpp
 )
 
 add_executable(calculator

examples/calculator/LongProcessingRandomNumber.hpp

@@ -3,14 +3,15 @@
 #include <QtNodes/NodeDelegateModel>
 #include <QTimer>
 #include <QtCore/QObject>
+#include <QtCore/QElapsedTimer>
 #include <QtWidgets/QLabel>
 #include <QtCore/QRandomGenerator64>
 
 #include "MathOperationDataModel.hpp"
 #include "DecimalData.hpp"
 
-/// The model generates a random value in a long processing schema,
-/// as it should demonstrate the usage of the NodeProcessingStatus.
+/// The model generates a random value in a long processing schema, as it should demonstrate
+/// the usage of the NodeProcessingStatus and the ProgressValue functionality.
 /// The random number is generate in the [n1, n2] interval.
 class RandomNumberModel : public MathOperationDataModel
 {
@@ -20,21 +21,53 @@ class RandomNumberModel : public MathOperationDataModel
 
 
         QObject::connect(this, &NodeDelegateModel::computingStarted, this, [this]() {
-            if (_number1.lock() && _number2.lock()) {
-                this->setNodeProcessingStatus(
-                    QtNodes::NodeProcessingStatus::Processing);
+            this->setNodeProcessingStatus(
+                QtNodes::NodeProcessingStatus::Processing);
+
+            setProgressValue(QString{"0%"});
+            emit requestNodeUpdate();
+
+            _elapsedTimer.start();
+
+            if (!_progressTimer) {
+                _progressTimer = new QTimer(this);
+                connect(_progressTimer, &QTimer::timeout, this, [this]() {
+                    qint64 elapsed = _elapsedTimer.elapsed();
+                    int percent = static_cast<int>((double(elapsed) / _totalDurationMs) * 100.0);
+
+                    if (percent > 100)
+                        percent = 100;
+
+                    setProgressValue(QString::number(percent) + "%");
+                    emit requestNodeUpdate();
+                });
             }
 
+            _progressTimer->start(_progressUpdateIntervalMs);
+
             emit requestNodeUpdate();
         });
+
         QObject::connect(this, &NodeDelegateModel::computingFinished, this, [this]() {
+            if (_progressTimer) {
+                _progressTimer->stop();
+            }
+
+            setProgressValue(QString());
+
             this->setNodeProcessingStatus(
                 QtNodes::NodeProcessingStatus::Updated);
 
             emit requestNodeUpdate();
         });
     }
-    virtual ~RandomNumberModel() {}
+
+    virtual ~RandomNumberModel() {
+        if (_progressTimer) {
+            _progressTimer->stop();
+            delete _progressTimer;
+        }
+    }
 
 public:
     QString caption() const override { return QStringLiteral("Random Number"); }
@@ -44,40 +77,50 @@ class RandomNumberModel : public MathOperationDataModel
 private:
     void compute() override
     {
+        auto n1 = _number1.lock();
+        auto n2 = _number2.lock();
+
+        if (!n1 || !n2) {
+            return;
+        }
+
         Q_EMIT computingStarted();
         PortIndex const outPortIndex = 0;
 
-        auto n1 = _number1.lock();
-        auto n2 = _number2.lock();
+        QTimer::singleShot(_totalDurationMs, this, [this, n1, n2]() {
+            if (n1 && n2) {
+                double a = n1->number();
+                double b = n2->number();
+
+                if (a > b) {
+                    setNodeProcessingStatus(QtNodes::NodeProcessingStatus::Failed);
 
-        QTimer *timer = new QTimer(this);
-        timer->start(1000);
-        int secondsRemaining = 3;
-        connect(timer, &QTimer::timeout, this, [=]() mutable {
-            if (--secondsRemaining <= 0) {
-                timer->stop();
-                if (n1 && n2) {
-                    double a = n1->number();
-                    double b = n2->number();
-
-                    if (a > b) {
-                        setNodeProcessingStatus(QtNodes::NodeProcessingStatus::Failed);
-
-                        emit requestNodeUpdate();
-                        return;
+                    if (_progressTimer) {
+                        _progressTimer->stop();
                     }
 
-                    double upper = std::nextafter(b, std::numeric_limits<double>::max());
-                    double randomValue = QRandomGenerator::global()->generateDouble() * (upper - a) + a;
+                    setProgressValue(QString());
 
-                    _result = std::make_shared<DecimalData>(randomValue);
-                    Q_EMIT computingFinished();
-                } else {
-                    _result.reset();
+                    emit requestNodeUpdate();
+                    return;
                 }
 
-                Q_EMIT dataUpdated(outPortIndex);
+                double upper = std::nextafter(b, std::numeric_limits<double>::max());
+                double randomValue = QRandomGenerator::global()->generateDouble() * (upper - a) + a;
+
+                _result = std::make_shared<DecimalData>(randomValue);
+                emit computingFinished();
+            } else {
+                _result.reset();
             }
+
+            Q_EMIT dataUpdated(outPortIndex);
         });
     }
+
+    QTimer *_progressTimer = nullptr;
+    QElapsedTimer _elapsedTimer;
+
+    const int _totalDurationMs = 3000;
+    const int _progressUpdateIntervalMs = 50;
 };

include/QtNodes/internal/DefaultNodePainter.hpp

@@ -36,6 +36,8 @@ class NODE_EDITOR_PUBLIC DefaultNodePainter : public AbstractNodePainter
 
     void drawValidationIcon(QPainter *painter, NodeGraphicsObject &ngo) const;
 
+    void drawProgressValue(QPainter *painter, NodeGraphicsObject &ngo) const;
+
 private:
     QIcon _toolTipIcon{"://info-tooltip.svg"};
 };

include/QtNodes/internal/Definitions.hpp

@@ -18,23 +18,24 @@ NODE_EDITOR_PUBLIC Q_NAMESPACE
 Q_NAMESPACE_EXPORT(NODE_EDITOR_PUBLIC)
 #endif
 
-/**
+    /**
  * Constants used for fetching QVariant data from GraphModel.
  */
-enum class NodeRole {
-    Type = 0,             ///< Type of the current node, usually a string.
-    Position = 1,         ///< `QPointF` positon of the node on the scene.
-    Size = 2,             ///< `QSize` for resizable nodes.
-    CaptionVisible = 3,   ///< `bool` for caption visibility.
-    Caption = 4,          ///< `QString` for node caption.
-    Style = 5,            ///< Custom NodeStyle as QJsonDocument
-    InternalData = 6,     ///< Node-stecific user data as QJsonObject
-    InPortCount = 7,      ///< `unsigned int`
-    OutPortCount = 9,     ///< `unsigned int`
-    Widget = 10,          ///< Optional `QWidget*` or `nullptr`
-    ValidationState = 11, ///< Enum NodeValidationState of the node
-    ProcessingStatus = 12 ///< Enum NodeProcessingStatus of the node
-};
+    enum class NodeRole {
+        Type = 0,              ///< Type of the current node, usually a string.
+        Position = 1,          ///< `QPointF` positon of the node on the scene.
+        Size = 2,              ///< `QSize` for resizable nodes.
+        CaptionVisible = 3,    ///< `bool` for caption visibility.
+        Caption = 4,           ///< `QString` for node caption.
+        Style = 5,             ///< Custom NodeStyle as QJsonDocument
+        InternalData = 6,      ///< Node-stecific user data as QJsonObject
+        InPortCount = 7,       ///< `unsigned int`
+        OutPortCount = 9,      ///< `unsigned int`
+        Widget = 10,           ///< Optional `QWidget*` or `nullptr`
+        ValidationState = 11,  ///< Enum NodeValidationState of the node
+        ProcessingStatus = 12, ///< Enum NodeProcessingStatus of the node
+        ProgressValue = 13,    ///< 'QString' for the progress value
+    };
 Q_ENUM_NS(NodeRole)
 
 /**

include/QtNodes/internal/NodeDelegateModel.hpp

@@ -85,6 +85,10 @@ class NODE_EDITOR_PUBLIC NodeDelegateModel
     /// Returns the curent processing status
     virtual NodeProcessingStatus processingStatus() const { return _processingStatus; }
 
+    /// Progress is used in GUI
+    virtual QString progressValue() const { return _progressValue; }
+
+public:
     QJsonObject save() const override;
 
     void load(QJsonObject const &) override;
@@ -109,6 +113,8 @@ class NODE_EDITOR_PUBLIC NodeDelegateModel
 
     void setStatusIconStyle(ProcessingIconStyle const &style);
 
+    void setProgressValue(QString new_progress) { _progressValue = new_progress; }
+
 public:
     virtual void setInData(std::shared_ptr<NodeData> nodeData, PortIndex const portIndex) = 0;
 
@@ -184,6 +190,8 @@ public Q_SLOTS:
     NodeValidationState _nodeValidationState;
 
     NodeProcessingStatus _processingStatus{NodeProcessingStatus::NoStatus};
+
+    QString _progressValue{QString()};
 };
 
 } // namespace QtNodes

src/DataFlowGraphModel.cpp

@@ -303,6 +303,10 @@ QVariant DataFlowGraphModel::nodeData(NodeId nodeId, NodeRole role) const
         auto processingStatus = model->processingStatus();
         result = QVariant::fromValue(processingStatus);
     } break;
+
+    case NodeRole::ProgressValue:
+        result = model->progressValue();
+        break;
     }
 
     return result;
@@ -382,8 +386,10 @@ bool DataFlowGraphModel::setNodeData(NodeId nodeId, NodeRole role, QVariant valu
         }
         Q_EMIT nodeUpdated(nodeId);
     } break;
-    }
 
+    case NodeRole::ProgressValue:
+        break;
+    }
     return result;
 }
 

src/DefaultHorizontalNodeGeometry.cpp

@@ -55,6 +55,7 @@ void DefaultHorizontalNodeGeometry::recomputeSize(NodeId const nodeId) const
     height += _portSpasing; // space below caption
 
     QVariant var = _graphModel.nodeData(nodeId, NodeRole::ProcessingStatus);
+
     auto processingStatusValue = var.value<int>();
 
     if (processingStatusValue != 0)

src/DefaultNodePainter.cpp

@@ -38,6 +38,8 @@ void DefaultNodePainter::paint(QPainter *painter, NodeGraphicsObject &ngo) const
     drawResizeRect(painter, ngo);
 
     drawValidationIcon(painter, ngo);
+
+    drawProgressValue(painter, ngo);
 }
 
 void DefaultNodePainter::drawNodeRect(QPainter *painter, NodeGraphicsObject &ngo) const
@@ -375,4 +377,31 @@ void DefaultNodePainter::drawValidationIcon(QPainter *painter, NodeGraphicsObjec
     painter->restore();
 }
 
+void DefaultNodePainter::drawProgressValue(QPainter *painter, NodeGraphicsObject &ngo) const
+{
+    AbstractGraphModel &model = ngo.graphModel();
+    NodeId const nodeId = ngo.nodeId();
+    AbstractNodeGeometry &geometry = ngo.nodeScene()->nodeGeometry();
+
+    QString const nodeProgress = model.nodeData(nodeId, NodeRole::ProgressValue).toString();
+
+    QFont font = painter->font();
+    font.setBold(true);
+    font.setPointSize(5);
+    auto rect = QFontMetrics(font).boundingRect(nodeProgress);
+
+    QSize size = geometry.size(nodeId);
+    QPointF position(rect.width() / 4.0, size.height() - 0.5 * rect.height());
+
+    QJsonDocument json = QJsonDocument::fromVariant(model.nodeData(nodeId, NodeRole::Style));
+    NodeStyle nodeStyle(json.object());
+
+    painter->setFont(font);
+    painter->setPen(nodeStyle.FontColor);
+    painter->drawText(position, nodeProgress);
+
+    font.setBold(false);
+    painter->setFont(font);
+}
+
 } // namespace QtNodes