Qt学习-模仿Qt实现一个colorbutton

1、mycolorbutton.h

#include<QToolButton>
#include<QtGlobal>
#include<QColor>
class MyColorButtonPrivate;
class MyColorButton : public QToolButton
{
    Q_OBJECT
public:
    MyColorButton(QWidget* parent);
    ~MyColorButton();
    QColor color() const;
public slots:
    void setColor(const QColor& color);
signals:
    void colorChanged(const QColor& color);
private:
    QScopedPointer<MyColorButtonPrivate> d_ptr;
    Q_DECLARE_PRIVATE(MyColorButton)
    Q_DISABLE_COPY(MyColorButton)
    Q_PRIVATE_SLOT(d_func(), void slotEditColor())
};

　　2、mycolorbutton_p.h

#include "mycolorbutton.h"
class MyColorButtonPrivate
{

public:
    QColor m_color;
    void slotEditColor();
    MyColorButton* q_ptr;
    Q_DECLARE_PUBLIC(MyColorButton)

};

　　3、mycolorbutton.cpp

#include <QColorDialog>
#include "mycolorbutton_p.h"

void MyColorButtonPrivate::slotEditColor()
{
    const QColor newColor = QColorDialog::getColor(m_color, q_ptr, QString(), QColorDialog::ShowAlphaChannel);
    if(!newColor.isValid() || newColor == q_ptr->color())
        return;
    q_ptr->setColor(newColor);
    emit q_ptr->colorChanged(m_color);
}
/////////////////////////////////////////////////////////////////
MyColorButton::MyColorButton(QWidget* parent)
    :QToolButton(parent), d_ptr(new MyColorButtonPrivate)
{
    d_ptr->q_ptr = this;
	connect(this, SIGNAL(clicked()), this, SLOT(slotEditColor()));
}

MyColorButton::~MyColorButton()
{

}

QColor MyColorButton::color() const
{
    return d_ptr->m_color;
}

void MyColorButton::setColor(const QColor &color)
{
    d_ptr->m_color = color;
}

#include "moc_mycolorbutton.cpp"