8、QColorDialog类（颜色对话框）

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QPushButton>
#include <QFrame>
#include <QColor>
#include <QGridLayout>

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = 0);
    ~Dialog();


private:
    QGridLayout *glayout;
    QPushButton *colorbutton;
    //基本控件的基类
    QFrame *colorFrame;


private slots:
    void dispcolorFunc();
};

#endif // DIALOG_H

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

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    setWindowTitle("颜色对话测试筐");
    glayout=new QGridLayout(this);

    colorbutton=new QPushButton("打开颜色选择");

    colorFrame=new QFrame;

    colorFrame->setFrameShape(QFrame::Box);//设置形状
    colorFrame->setAutoFillBackground(true);//填充背景处理

    glayout->addWidget(colorbutton,0,0);
    glayout->addWidget(colorFrame,1,0);

    //信号槽函数的连接
    connect(colorbutton,SIGNAL(clicked()),this,SLOT(dispcolorFunc()));
}

Dialog::~Dialog()
{

}

void Dialog::dispcolorFunc()
{
    QColor colorValues= QColorDialog::getColor(Qt::red);
    if(colorValues.isValid()){
        colorFrame->setPalette(QPalette(colorValues));
    }
}