QPalette调色板类

QT提供的调色板类QPalette专门用于管理部件外观显示，相当于部件或对话框的调色板，管理他们所有的颜色信息。每个部件都包含一个QPalette对象，在显示时，按照它的QPalette对象中对各部分各状态下的颜色的描述进行绘制。

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dialog.cpp

#include "dialog.h"

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    createCtrlFrame();
    createContentFrame();
    QHBoxLayout *mainLayout = new QHBoxLayout(this);
    mainLayout->addWidget(m_ctrlFrame);
    mainLayout->addWidget(m_contentFrame);
}

Dialog::~Dialog()
{

}

void Dialog::createCtrlFrame()
{
    m_ctrlFrame = new QFrame;
    m_ctrlFrame->setFrameStyle(QFrame::Sunken | QFrame::Box);
    m_windowLabel = new QLabel("QPalette::Window:");
    m_windowComboBox = new QComboBox;
    fillColorList(m_windowComboBox);
    connect(m_windowComboBox,SIGNAL(activated(int)),this,SLOT(ShowWindow(int)));//根据选择颜色给窗体设置颜色
    m_windowTextLabel = new QLabel("QPalette::WindowText");
    m_windowTextComboBox = new QComboBox;
     fillColorList(m_windowTextComboBox);
     //选中时发送信号
     connect(m_windowTextComboBox,SIGNAL(activated(int)),this,SLOT(ShowWindowText(int)));

    m_buttonLabel = new QLabel("QPalette::Button");
    m_buttonCombox = new QComboBox;
    fillColorList(m_buttonCombox);
    connect(m_buttonCombox,SIGNAL(activated(int)),this,SLOT(ShowButton(int)));

    m_buttonTextLabel = new QLabel("QPalette::ButtonText");
    m_buttonTextComboBox = new QComboBox;
    fillColorList(m_buttonTextComboBox);
   connect(m_buttonTextComboBox,SIGNAL(activated(int)),this,SLOT(ShowButtonText(int)));

   m_baseLabel = new QLabel("QPalette::Base");
   m_baseComboBox = new QComboBox;
   fillColorList(m_baseComboBox);
   connect(m_baseComboBox,SIGNAL(activated(int)),this,SLOT(ShowBase(int)));

   //布局
   QGridLayout *mainLayout = new QGridLayout(m_ctrlFrame);
   mainLayout->setSpacing(20);
   mainLayout->addWidget(m_windowLabel,0,0);
   mainLayout->addWidget(m_windowComboBox,0,1);
   mainLayout->addWidget(m_windowTextLabel,1,0);
   mainLayout->addWidget(m_windowTextComboBox,1,1);
   mainLayout->addWidget(m_buttonLabel,2,0);
   mainLayout->addWidget(m_buttonCombox,2,1);
   mainLayout->addWidget(m_buttonTextLabel,3,0);
   mainLayout->addWidget(m_buttonTextComboBox,3,1);
   mainLayout->addWidget(m_baseLabel,4,0);
   mainLayout->addWidget(m_baseComboBox,4,1);
}

void Dialog::createContentFrame()
{
    m_contentFrame = new QFrame;
    m_contentFrame->setAutoFillBackground(true);

    m_label1 = new QLabel("请输入一个值");
    m_label2 = new QLabel("请输入字符串");
    m_comboBox1 = new QComboBox;
    m_lineEdit = new QLineEdit;
    m_textEdit = new QTextEdit;

    m_okBtn = new QPushButton(QString("确认"));
    m_cancelBtn = new QPushButton(QString("取消"));
    m_okBtn->setAutoFillBackground(true);

    QGridLayout  *topLayout = new QGridLayout;
    topLayout->addWidget(m_label1,0,0);
    topLayout->addWidget(m_comboBox1,0,1);
    topLayout->addWidget(m_label2,1,0);
    topLayout->addWidget(m_lineEdit,1,1);
    topLayout->addWidget(m_textEdit,2,0,1,2);

    QHBoxLayout *bottomLayout = new QHBoxLayout;
    bottomLayout->addWidget(m_okBtn);
    bottomLayout->addWidget(m_cancelBtn);

    QVBoxLayout *mainLayout = new QVBoxLayout(m_contentFrame);
    mainLayout->addLayout(topLayout);
    mainLayout->addLayout(bottomLayout);
}

void Dialog::fillColorList(QComboBox *comboBox)
{
    QStringList colorList = QColor::colorNames();//获取所有颜色
    QString color;
    foreach (color, colorList)
    {
        QPixmap pix(QSize(70,20));//下拉框尺寸
        pix.fill(QColor(color));
        comboBox->addItem(QIcon(pix),NULL);//下拉菜单添加选项
        comboBox->setIconSize(QSize(70,20));
        comboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);//根据内容适应尺寸
    }
}

void Dialog::ShowWindow(int index)
{
    QStringList colorList = QColor::colorNames();
    QColor color = QColor(colorList[index]);//获取用户选择的颜色
    QPalette p = m_contentFrame->palette();//获取调色板
    p.setColor(QPalette::Window,color);
    m_contentFrame->setPalette(p);//设置调色板
    m_contentFrame->update();//刷新

}

void Dialog::ShowWindowText(int index)
{
    //找到颜色，获取调色板，设置调色板对指定位置颜色进行修改，刷新。
    QStringList colorList = QColor::colorNames();
    QColor color = QColor(colorList[index]);
    QPalette p = m_contentFrame->palette();
    p.setColor(QPalette::WindowText,color);
    m_contentFrame->setPalette(p);
    m_contentFrame->update();
}

void Dialog::ShowButton(int index)
{
    QStringList colorList = QColor::colorNames();
    QColor color = QColor(colorList[index]);
    QPalette p = m_contentFrame->palette();
    p.setColor(QPalette::Button,color);
    m_contentFrame->setPalette(p);
    m_contentFrame->update();
}

void Dialog::ShowButtonText(int index)
{
    QStringList colorList = QColor::colorNames();
    QColor color = QColor(colorList[index]);
    QPalette p = m_contentFrame->palette();
    p.setColor(QPalette::ButtonText,color);
    m_contentFrame->setPalette(p);
    m_contentFrame->update();
}

void Dialog::ShowBase(int index)
{
    QStringList colorList = QColor::colorNames();
    QColor color = QColor(colorList[index]);
    QPalette p = m_contentFrame->palette();
    p.setColor(QPalette::Base,color);
    m_contentFrame->setPalette(p);
    m_contentFrame->update();
}

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

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

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = 0);
    ~Dialog();
    void createCtrlFrame();
    void createContentFrame();
    void fillColorList(QComboBox* comboBox);//给组合框添加颜色列表
public slots:
    void ShowWindow(int index);
    void ShowWindowText(int index);
    void ShowButton(int index);
    void ShowButtonText(int index);
    void ShowBase(int index);
private:
    QFrame *m_ctrlFrame;
    QLabel *m_windowLabel;
    QComboBox*m_windowComboBox;
    QLabel *m_windowTextLabel;
    QComboBox *m_windowTextComboBox;
    QLabel *m_buttonLabel;
    QComboBox * m_buttonCombox;
    QLabel* m_buttonTextLabel;
    QComboBox* m_buttonTextComboBox;
    QLabel* m_baseLabel;
    QComboBox *m_baseComboBox;
    QFrame* m_contentFrame;
    QLabel* m_label1;
    QLabel* m_label2;
    QComboBox* m_comboBox1;
    QLineEdit* m_lineEdit;
    QTextEdit* m_textEdit;
    QPushButton* m_okBtn;
    QPushButton* m_cancelBtn;

};



#endif // DIALOG_H

上述代码中调色板是如何知道指定位置代表的是什么内容？

WindowText,Button…等已经在QT内声明好了。

enum ColorRole { WindowText, Button, Light, Midlight, Dark, Mid,
                     Text, BrightText, ButtonText, Base,Window, Shadow,
                     Highlight, HighlightedText,
                     Link, LinkVisited,
                     AlternateBase,
                     NoRole,
                     ToolTipBase, ToolTipText,
                     NColorRoles = ToolTipText + 1,
                     Foreground = WindowText, Background = Window
};

相比较起来样式表功能更加强大，如果要实现的颜色效果不是很复杂，可以使用调色板。

本文福利，莬费领取Qt开发学习资料包、技术视频，内容包括（C++语言基础，Qt编程入门，QT信号与槽机制，QT界面开发-图像绘制，QT网络，QT数据库编程，QT项目实战，QSS，OpenCV，Quick模块，面试题等等）↓↓↓↓↓↓见下面↓↓文章底部点击莬费领取↓↓