Color Picker in QT

Qt Enthusiast

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

Qt Enthusiast

@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

XavierLL

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!