Qt QWidget

成员函数

move(int x, int y);
move(const QPoint &);
setGeometry(int x, int y, int w, int h);
setMimiMumSize(int w, int h);
setMaxiMumSize(int w, int h);
setFont(const QFont &);

QPalette（调色板）

管理控件外观显示。
ColorGroup

• QPalette::Active，获得焦点状态
• QPalette::Inactive，未获得焦点状态
• QPalette::Disable，不可用状态

不可行时用qss代替。

setStyleSheet("background-color: rgb(170, 0, 255);");

//首先调用，设置控件自动填充背景
setAutoFillBackground(true);

//单一颜色填充
void QPalette::setColor(ColorGroup group, ColorRole role, const QColor &color);
void QPalette::setColor(ColorRole role, const QColor &color);

//非单一颜色（比如图片）填充
void QPalette::setBrush(ColorGroup group, ColorRole role, const QBrush &brush);
void QPalette::setColor(ColorRole role, const QBrush &brush);

Palette.pro

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = Palette
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += main.cpp \
    palette.cpp

HEADERS  += palette.h

main.cpp

#include "palette.h"
#include <QApplication>

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);

    Palette w;
    w.show();

    return a.exec();
}

palette.h

#ifndef PALETTE_H
#define PALETTE_H

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

class Palette : public QDialog {
    Q_OBJECT
public:
    explicit Palette(QWidget *parent = 0);
    void fillColorList(QComboBox *);//完成向颜色下拉列表框中插入颜色的工作
private slots:
    void ShowWindow();
    void ShowWindowText();
    void ShowButton();
    void ShowButtonText();
    void ShowBase();
private:
    QLabel *windowLabel;
    QComboBox *windowComboBox;
    QLabel *windowTextLabel;
    QComboBox *windowTextComboBox;
    QLabel *buttonLabel;
    QComboBox *buttonComboBox;
    QLabel *buttonTextLabel;
    QComboBox *buttonTextComboBox;
    QLabel *baseLabel;
    QComboBox *baseComboBox;

    QFrame *ctrlFrame; //颜色选择面板
    QGridLayout *leftLayout;

    QLabel *label1;
    QComboBox *comboBox1;
    QLabel *label2;
    QLineEdit *lineEdit2;
    QTextEdit *textEdit;
    QGridLayout *TopLayout;

    QPushButton *OkBtn;
    QPushButton *CancelBtn;
    QHBoxLayout *BottomLayout;

    QFrame *contentFrame; //具体显示面板
    QVBoxLayout *rightLayout;

    QHBoxLayout *mainLayout;
};

#endif // PALETTE_H

palette.cpp

#include "palette.h"
#include <QStandardItemModel>


Palette::Palette(QWidget *parent) : QDialog(parent) {
    //完成窗体左半部分颜色选择区的创建
    windowLabel = new QLabel(tr("QPalette::Window: "));
    windowComboBox = new QComboBox;
    fillColorList(windowComboBox);
    connect(windowComboBox, SIGNAL(activated(int)), this, SLOT(ShowWindow()));

    windowTextLabel = new QLabel(tr("QPalette::WindowText: "));
    windowTextComboBox = new QComboBox;
    fillColorList(windowTextComboBox);
    connect(windowTextComboBox, SIGNAL(activated(int)), this, SLOT(ShowWindowText()));

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

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

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

    ctrlFrame = new QFrame; //颜色选择面板
    leftLayout = new QGridLayout(ctrlFrame);
    leftLayout->setSpacing(20);
    leftLayout->addWidget(windowLabel, 0, 0);
    leftLayout->addWidget(windowComboBox, 0, 1);
    leftLayout->addWidget(windowTextLabel, 1, 0);
    leftLayout->addWidget(windowTextComboBox, 1, 1);
    leftLayout->addWidget(buttonLabel, 2, 0);
    leftLayout->addWidget(buttonComboBox, 2, 1);
    leftLayout->addWidget(buttonTextLabel, 3, 0);
    leftLayout->addWidget(buttonTextComboBox, 3, 1);
    leftLayout->addWidget(baseLabel, 4, 0);
    leftLayout->addWidget(baseComboBox, 4, 1);

    //完成窗体右半部分的创建
    label1 = new QLabel(tr("请选择一个值："));
    comboBox1 = new QComboBox;
    //comboBox1->setStyleSheet("background-color: red;");
    //comboBox1->setStyleSheet("QComboBox::drop-down {background: red;}");
    /*
    QPalette pal = comboBox1->palette();
    pal.setColor(QPalette::Base, QColor("red"));
    comboBox1->setPalette(pal);
    */

    comboBox1->addItems({"Item 1", "Item 2", "Item 3", "Item 4", "Item 5"});
    QStandardItemModel *pItemModel = qobject_cast<QStandardItemModel*>(comboBox1->model());
    pItemModel->item(0)->setForeground(QColor(255, 0, 0));            //修改某项文本颜色
    pItemModel->item(0)->setBackground(QColor(0, 0, 255));    //修改某项背景颜色

    label2 = new QLabel(tr("请输入字符串："));
    lineEdit2 = new QLineEdit;
    //lineEdit2->setAutoFillBackground(true);//使用QPlatte失效
    lineEdit2->setStyleSheet("background-color: rgba(0, 255, 255, 255);");
    textEdit = new QTextEdit;

    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(tr("确认"));
    OkBtn->setAutoFillBackground(true); //使用QPlatte失效
    CancelBtn = new QPushButton(tr("取消"));
    CancelBtn->setStyleSheet("background-color: rgb(170, 0, 255);");
    BottomLayout = new QHBoxLayout;
    BottomLayout->addStretch(1);
    BottomLayout->addWidget(OkBtn);
    BottomLayout->addWidget(CancelBtn);

    contentFrame = new QFrame; //具体显示面板
    contentFrame->setAutoFillBackground(true);
    rightLayout = new QVBoxLayout(contentFrame);
    rightLayout->addLayout(TopLayout);
    rightLayout->addLayout(BottomLayout);

    mainLayout = new QHBoxLayout(this);
    mainLayout->addWidget(ctrlFrame);
    mainLayout->addWidget(contentFrame);

    setWindowFlags(Qt::WindowCloseButtonHint);
}

void Palette::ShowWindow() {
    //获得当前选择的颜色值
    QStringList colorList = QColor::colorNames();
    QColor color = QColor(colorList[windowComboBox->currentIndex()]);
    QPalette p = contentFrame->palette();
    p.setColor(QPalette::Window, color);
    //把修改后的调色板信息应用到contentFrame窗体中，更新显示
    contentFrame->setPalette(p);
    contentFrame->update();
}

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

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

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

void Palette::fillColorList(QComboBox *comboBox) {
    foreach(QString color, QColor::colorNames()) {	//对颜色名列表进行遍历
        QPixmap pix(QSize(70, 20));
        pix.fill(QColor(color));   //为pix填充当前遍历的颜色
        comboBox->addItem(QIcon(pix), NULL);
        comboBox->setIconSize(QSize(70, 20));
        comboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
    }
}