程序

.h
#ifndef PALETTE_H
#define PALETTE_H

#include <QDialog>
#include <QComboBox>
#include <QLabel>
#include <QTextEdit>
#include <QPushButton>
#include <QLineEdit>

class Palette : public QDialog
{
    Q_OBJECT

public:
    Palette(QWidget *parent = 0);
    ~Palette();
    void createCtrlFrame();
    void createConTentFrame();
    void fillColorList(QComboBox*);
private slots:
    void ShowWindow();
    void ShowWindowText();
    void ShowButton();
    void ShowButtonText();
    void ShowBase();
private:
    QFrame *ctrlFrame;//颜色选择面板
    QLabel *windowLabel;
    QComboBox *windowComboBox;
    QLabel *windowTextLabel;
    QComboBox *windowTextComboBox;
    QLabel *buttonLabel;
    QComboBox *buttonComboBox;
    QLabel *buttonTextLabel;
    QComboBox *buttonTextComboBox;
    QLabel *baseLabel;
    QComboBox *baseComboBox;
    QFrame*contentFrame;//具体显示面板
    QLabel *label1;
    QComboBox *comboBox1;
    QLabel *label2;
    QLineEdit *lineEdit2;
    QTextEdit *textEdit;
    QPushButton *OkBtn;
    QPushButton *CancelBtn;
};

#endif // PALETTE_H

//.cpp
#include "palette.h"
#include <QHBoxLayout>
#include <QGridLayout>
Palette::Palette(QWidget *parent)
    : QDialog(parent)
{
    createCtrlFrame();
    createConTentFrame();
    QHBoxLayout *mainLayout=new QHBoxLayout(this);
    mainLayout->addWidget(ctrlFrame);
    mainLayout->addWidget(contentFrame);
    contentFrame->setAutoFillBackground(true);//设置背景自动填充
}

Palette::~Palette()
{

}

void Palette::createCtrlFrame()//创建颜色选择区
{
    ctrlFrame=new QFrame;
    windowLabel=new QLabel("QPalette::Window:");
    windowComboBox=new QComboBox;
    fillColorList(windowComboBox);//向下拉列表里插入不同的颜色选项
    connect(windowComboBox,SIGNAL(activated(int)),this,SLOT(ShowWindow()));
    windowTextLabel=new QLabel("QPalette::WindowText:");
    windowTextComboBox=new QComboBox;
    fillColorList(windowTextComboBox);//向下拉列表里插入不同的颜色选项
    connect(windowTextComboBox,SIGNAL(activated(int)),this,SLOT(ShowWindowText()));
    buttonLabel=new QLabel("QPalette::Button:");
    buttonComboBox=new QComboBox;
    fillColorList(buttonComboBox);//向下拉列表里插入不同的颜色选项
    connect(buttonComboBox,SIGNAL(activated(int)),this,SLOT(ShowButton()));
    buttonTextLabel=new QLabel("QPalette::ButtonText:");
    buttonTextComboBox=new QComboBox;
    fillColorList(buttonTextComboBox);//向下拉列表里插入不同的颜色选项
    connect(buttonTextComboBox,SIGNAL(activated(int)),this,SLOT(ShowButtonText()));
    baseLabel=new QLabel("QPalette::Base:");
    baseComboBox=new QComboBox;
    fillColorList(baseComboBox);//向下拉列表里插入不同的颜色选项
    connect(baseComboBox,SIGNAL(activated(int)),this,SLOT(ShowBase()));
    QGridLayout*mainLayout=new QGridLayout(ctrlFrame);
    mainLayout->setSpacing(20);
    mainLayout->addWidget(windowLabel,0,0);
    mainLayout->addWidget(windowComboBox,0,1);
    mainLayout->addWidget(windowTextLabel,1,0);
    mainLayout->addWidget(windowTextComboBox,1,1);
    mainLayout->addWidget(buttonLabel,2,0);
    mainLayout->addWidget(buttonComboBox,2,1);
    mainLayout->addWidget(buttonTextLabel,3,0);
    mainLayout->addWidget(buttonTextComboBox,3,1);
    mainLayout->addWidget(baseLabel,4,0);
    mainLayout->addWidget(baseComboBox,4,1);

}

void Palette::createConTentFrame()//背景填充区
{
    contentFrame =new QFrame;
    label1=new QLabel("请选择一个值：");
    comboBox1=new QComboBox;
    label2=new QLabel("请输入字符串：");
    lineEdit2=new QLineEdit;
    textEdit=new QTextEdit;
    QGridLayout *TopLayout=new QGridLayout;
    TopLayout->addWidget(label1,0,0);
    TopLayout->addWidget(comboBox1,0,1);
    TopLayout->addWidget(label2,1,0);
    TopLayout->addWidget(lineEdit2,1,1);
    TopLayout->addWidget(textEdit,2,0,1,2);
    OkBtn=new QPushButton("确认");
    CancelBtn=new QPushButton("取消");
    QHBoxLayout *BottomLayout=new QHBoxLayout;
    BottomLayout->addStretch(1);
    BottomLayout->addWidget(OkBtn);
    BottomLayout->addWidget(CancelBtn);
    QVBoxLayout *mainLayout=new QVBoxLayout(contentFrame);
    mainLayout->addLayout(TopLayout);
    mainLayout->addLayout(BottomLayout);

}

void Palette::fillColorList(QComboBox *comboBox)//插入颜色
{
    QStringList colorList=QColor::colorNames();//获得QT所有内置名称的颜色名列表，返回一个字符串列表
    QString color;//新建一个QColor为循环遍历做准备
    foreach (color, colorList)
    {
        QPixmap pix(QSize(70,20));//新建一个QPixmap对象pix作为显示颜色的图标
        pix.fill(QColor(color));//为pix填充当前遍历的颜色
        comboBox->addItem(QIcon(pix),NULL);//将遍历到的pix插入comboBox，名称设为NULL
        comboBox->setIconSize(QSize(70,20));//设置图标的尺寸和pix相同
        comboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);//设置下拉列表框的尺寸调整策略为符合内容大小的尺寸
    }
}

void Palette::ShowWindow()
{
    QStringList colorList=QColor::colorNames();//获得QT所有内置名称的颜色名列表，返回一个字符串列表
    QColor color=QColor(colorList[windowComboBox->currentIndex()]);//获取选中的颜色
    QPalette p=contentFrame->palette();//获得右部窗体的调色板信息
    p.setColor(QPalette::Window,color);//设置contentFrame的背景颜色为color
    contentFrame->setPalette(p);
    contentFrame->update();
}

void Palette::ShowWindowText()
{
    QStringList colorList=QColor::colorNames();
    QColor color=QColor(colorList[windowTextComboBox->currentIndex()]);
    QPalette p=contentFrame->palette();
    p.setColor(QPalette::Window,color);
    contentFrame->setPalette(p);
}

void Palette::ShowButton()
{
    QStringList colorList=QColor::colorNames();
    QColor color=QColor(colorList[buttonComboBox->currentIndex()]);
    QPalette p=contentFrame->palette();
    p.setColor(QPalette::Window,color);
    contentFrame->setPalette(p);
    contentFrame->update();
}

void Palette::ShowButtonText()
{
    QStringList colorList=QColor::colorNames();
    QColor color=QColor(colorList[buttonTextComboBox->currentIndex()]);
    QPalette p=contentFrame->palette();
    p.setColor(QPalette::Window,color);
    contentFrame->setPalette(p);
}

void Palette::ShowBase()
{
    QStringList colorList=QColor::colorNames();
    QColor color=QColor(colorList[baseComboBox->currentIndex()]);
    QPalette p=contentFrame->palette();
    p.setColor(QPalette::Window,color);
    contentFrame->setPalette(p);
}

效果展示

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