How to change widget shape in QtDesigner ?

[d_stranz]

The documentation for Q_ENUMS() says it is obsolete and that you should use Q_ENUM() instead. It is possible that the version of Qt Designer you are using depends on the enum being registered with Qt's meta type system. Q_ENUM() must be placed in the code after the enum has been declared.

#pragma once
 
#include <Qt>
#include <QtWidgets/QWidget>
#include <QtUiPlugin/QDesignerExportWidget>
 
 
// My Qt designer widget plugin class
 
class QColor;
 
class QDESIGNER_WIDGET_EXPORT QLed : public QWidget
{
    Q_OBJECT
 
    Q_PROPERTY(bool value READ value WRITE setValue)
    Q_PROPERTY(ledColor onColor READ onColor WRITE setOnColor)
    Q_PROPERTY(ledColor offColor READ offColor WRITE setOffColor)
    Q_PROPERTY(ledShape shape READ shape WRITE setShape)
 
public: 
    explicit QLed(QWidget *parent = 0);
 
    bool value() const { return m_value; }
 
    enum ledColor { Red = 0, Green, Yellow, Grey, Orange, Purple, Blue };
    Q_ENUM (ledColor)
 
    enum ledShape { Circle = 0, Square, Triangle, Rounded };
    Q_ENUM (ledShape)
 
    ledColor onColor() const { return m_onColor; }
    ledColor offColor() const { return m_offColor; }
    ledShape shape() const { return m_shape; }
 
public slots:
    void setValue(bool);
    void setOnColor(ledColor);
    void setOffColor(ledColor);   
    void setShape(ledShape);
    void toggleValue();
 
signals:
    void shapeChanged(ledShape);
 
protected:
    bool m_value;
 
    ledColor m_onColor, m_offColor;
 
    int id_Timer;
 
    ledShape m_shape;
 
 
    void paintEvent(QPaintEvent *event) override;
};

#pragma once

#include <Qt>
#include <QtWidgets/QWidget>
#include <QtUiPlugin/QDesignerExportWidget>


// My Qt designer widget plugin class

class QColor;

class QDESIGNER_WIDGET_EXPORT QLed : public QWidget
{
    Q_OBJECT
    
    Q_PROPERTY(bool value READ value WRITE setValue)
    Q_PROPERTY(ledColor onColor READ onColor WRITE setOnColor)
    Q_PROPERTY(ledColor offColor READ offColor WRITE setOffColor)
    Q_PROPERTY(ledShape shape READ shape WRITE setShape)

public: 
    explicit QLed(QWidget *parent = 0);

    bool value() const { return m_value; }

    enum ledColor { Red = 0, Green, Yellow, Grey, Orange, Purple, Blue };
    Q_ENUM (ledColor)

    enum ledShape { Circle = 0, Square, Triangle, Rounded };
    Q_ENUM (ledShape)

    ledColor onColor() const { return m_onColor; }
    ledColor offColor() const { return m_offColor; }
    ledShape shape() const { return m_shape; }
    
public slots:
    void setValue(bool);
    void setOnColor(ledColor);
    void setOffColor(ledColor);   
    void setShape(ledShape);
    void toggleValue();

signals:
    void shapeChanged(ledShape);

protected:
    bool m_value;

    ledColor m_onColor, m_offColor;

    int id_Timer;

    ledShape m_shape;

 
    void paintEvent(QPaintEvent *event) override;
};

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For your example with the 5 LEDs, can you post the XML .ui file that Qt Designer creates for this widget? In Qt Designer, be sure to select different shapes for the LEDs even if Qt Designer shows them all as circles.