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Forum Update on Tuesday, May 27th 2025

Color Picker in QT

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  • Q Offline
    Q Offline
    Qt Enthusiast
    wrote on 20 Apr 2016, 04:10 last edited by
    #1

    I have a requirement in which I have Right Mouse Button and menu comes Color . When the user clicks on Color pop up , When the user clicks on Color pop up , a color picker dialog should come up and when the user picks the color and presses OK then the a rectangle in other QGraphicsView should=be filled with the selected color

    I assume I should QColorDialog should work

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    • Q Offline
      Q Offline
      Qt Enthusiast
      wrote on 20 Apr 2016, 04:20 last edited by
      #2

      @Qt-Enthusiast said:

      I have a requirement in which I have Right Mouse Button and menu comes Color . When the user clicks on Color pop up , When the user clicks on Color pop up , a color picker dialog should come up and when the user picks the color and presses OK then the a rectangle in other QGraphicsView should=be filled with the selected color

      I assume I should QColorDialog should work

      I have a requirement in which I have Right Mouse Button and menu comes Color . When the user clicks on Color pop up , When the user clicks on Color pop up , a color picker dialog should come up and when the user picks the color and presses OK then the a rectangle in other QGraphicsView should=be filled with the selected color

      I assume I should QColorDialog should work. Please let me know if I am going correct and

      It will be helpful I get ar reference example Where I come to know how to use QColorDialog

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      • X Offline
        X Offline
        XavierLL
        wrote on 20 Apr 2016, 06:09 last edited by
        #3

        Hi,

        Not sure if I understood exactly what you wanted, I created a context menu when right clicking over your scene with the action "color" and when clicking the action, the color dialog will show up.

        This is the header code:

        #ifndef MAINWIDGET_H
        #define MAINWIDGET_H
        
        #include <QWidget>
        
        class QGraphicsRectItem;
        
        class MainWidget : public QWidget
        {
            Q_OBJECT
        
        public:
            MainWidget(QWidget *parent = 0);
            ~MainWidget();
        
        public slots:
            void contextMenuRequested(const QPoint& pos);
            void showColorPicker();
        
        protected:
            virtual void resizeEvent(QResizeEvent *event) override;
        
            QGraphicsRectItem *m_rect;
        };
        
        #endif // MAINWIDGET_H
        
        

        This is the cpp

        #include "MainWidget.h"
        
        #include <QGraphicsView>
        #include <QGraphicsWidget>
        #include <QMenu>
        #include <QDebug>
        #include <QAction>
        #include <QGraphicsRectItem>
        #include <QColorDialog>
        
        MainWidget::MainWidget(QWidget *parent)
            : QWidget(parent)
        {
            setContextMenuPolicy(Qt::CustomContextMenu);
            connect(this, &QWidget::customContextMenuRequested,this, &MainWidget::contextMenuRequested);
        }
        
        MainWidget::~MainWidget()
        {
        
        }
        
        void MainWidget::resizeEvent(QResizeEvent *event)
        {
            Q_UNUSED(event);
            QGraphicsView *gv = new QGraphicsView(this);
            QGraphicsScene *gs = new QGraphicsScene(this);
        
            gv->setScene(gs);
            m_rect = gs->addRect(10, 10, 500, 500, QPen(Qt::blue), QBrush(Qt::red));
        }
        
        void MainWidget::contextMenuRequested(const QPoint& pos)
        {
            qDebug() << "Menu Requested";
            QMenu *contextMenu = new QMenu(this);
        
        
            QAction *action = contextMenu->addAction("Color");
        
            contextMenu->popup(mapToGlobal(pos));
        
            connect(action, &QAction::triggered, this, &MainWidget::showColorPicker);
        }
        
        void MainWidget::showColorPicker()
        {
            QColor color = QColorDialog::getColor();
            m_rect->setBrush(color);
        }
        

        This is a very basic example working ok for me. You'll have to work a little bit around it.

        Hope it helps!

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        20 Apr 2016, 06:09

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