WtFlowWidget.h

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#pragma once
 
#include <Wt/WEvent.h>
#include <Wt/WPaintedWidget.h>
#include <Wt/WPointF.h>
#include <Wt/WPainterPath.h>
#include <Wt/WPainter.h>
 
#include <SceneGraph.h>
 
#include "WtFlowNodeData.h"
 
enum PortState { in, out };
 
struct sceneConnection {
    std::shared_ptr<Node> exportNode;
    std::shared_ptr<Node> inportNode;
    connectionPointData inPoint;
    connectionPointData outPoint;
};
 
class WtFlowWidget : public Wt::WPaintedWidget
{
public:
    WtFlowWidget(std::shared_ptr<dyno::SceneGraph> scene);
    virtual ~WtFlowWidget() = default;
 
    virtual void onMouseMove(const Wt::WMouseEvent& event) = 0;
    virtual void onMouseWentDown(const Wt::WMouseEvent& event) = 0;
    virtual void onMouseWentUp(const Wt::WMouseEvent& event) = 0;
    virtual void onKeyWentDown() = 0;
 
    void onMouseWheel(const Wt::WMouseEvent& event);
    void zoomIn();
    void zoomOut();
 
    void reorderNode();
    void updateAll();
 
    bool checkMouseInRect(Wt::WPointF mousePoint, WtFlowNodeData nodeData);
 
    bool checkMouseInPoints(Wt::WPointF mousePoint, WtFlowNodeData nodeData, PortState portState);
 
    Wt::WPainterPath cubicPath(Wt::WPointF source, Wt::WPointF sink);
    std::pair<Wt::WPointF, Wt::WPointF> pointsC1C2(Wt::WPointF source, Wt::WPointF sink);
    void drawSketchLine(Wt::WPainter* painter, Wt::WPointF source, Wt::WPointF sink);
 
    Wt::Signal<int>& selectNodeSignal() { return _selectNodeSignal; };
 
    Wt::Signal<>& updateCanvas() { return _updateCanvas; }
 
 
protected:
    double mZoomFactor;
    Wt::WPointF mLastMousePos;
    Wt::WPointF mLastDelta;
 
    bool isDragging = false;
    bool canMoveNode = false;
    bool reorderFlag = true;
    bool mEditingEnabled = true;
    bool drawLineFlag = false;
 
    Wt::WPointF mTranslate = Wt::WPointF(0, 0);
    Wt::WPointF mTranslateNode = Wt::WPointF(0, 0);
    Wt::WPointF mMousePoint = Wt::WPointF(0, 0);
 
    std::shared_ptr<dyno::SceneGraph> mScene;
 
    Wt::Signal<int> _selectNodeSignal;
    Wt::Signal<> _updateCanvas;
 
    int selectType = -1;
    int selectedNum = 0;
 
    Wt::WPointF sourcePoint;
    Wt::WPointF sinkPoint;
 
    connectionPointData outPoint;
    connectionPointData inPoint;
};