qt实现颜色下拉框控件

控件如图所示：

代码：

ColorCombox.h

#ifndef COLORCOMBOX_H#define COLORCOMBOX_H#include <QToolButton>class ColorCombox : public QToolButton{    Q_OBJECTpublic:    ColorCombox(QWidget *parent = 0);    ~ColorCombox();    void setButtonIcon(const QString &imageFile, QColor color);private:    QMenu* createColorMenu(const char *slot, const char *slotColorBoard);    QIcon createColorToolButtonIcon(const QString &imageFile, QColor color);    QIcon createColorIcon(QColor color);signals:    void sigColorChanged(QColor color);    private slots:        void OnColorChanged();           // 文本颜色设置        void OnShowColorBoard();         // 颜色板};#endif // COLORCOMBOX_H

ColorCombox.cpp

#include "ColorCombox.h"#include "hit_image.h"#include <QAction>#include <QGridLayout>#include <QMenu>#include <QPainter>#include <QColorDialog>const QColor colors[6][8] = {    {QColor(0, 0, 0, 255), QColor(170, 0, 0, 255), QColor(0, 85, 0, 255), QColor(170, 85, 0, 255),     QColor(0, 170, 0, 255), QColor(170, 170, 0, 255), QColor(0, 255, 0, 255), QColor(170, 250, 0, 255)},    {QColor(0, 0, 127, 255), QColor(170, 0, 127, 255), QColor(0, 85, 127, 255), QColor(170, 85, 127, 255),     QColor(0, 170, 127, 255), QColor(170, 170, 127, 255), QColor(0, 255, 127, 255), QColor(170, 255, 127, 255)},    {QColor(0, 0, 255, 255), QColor(170, 0, 255, 255), QColor(0, 85, 255, 255), QColor(170, 85, 255, 255),     QColor(0, 170, 255, 255), QColor(170, 170, 255, 255), QColor(0, 255, 255, 255), QColor(170, 255, 255, 255)},    {QColor(85, 0, 0, 255), QColor(255, 0, 0, 255), QColor(85, 85, 0, 255), QColor(255, 85, 0, 255),     QColor(85, 170, 0, 255), QColor(255, 170, 0, 255), QColor(85, 255, 0, 255), QColor(255, 255, 0, 255)},    {QColor(85, 0, 127, 255), QColor(255, 0, 127, 255), QColor(85, 85, 127, 255), QColor(255, 85, 127, 255),     QColor(85, 170, 127, 255), QColor(255, 170, 127, 255), QColor(85, 255, 127, 255), QColor(255, 255, 127, 255)},    {QColor(85, 0, 255, 255), QColor(255, 0, 255, 255), QColor(85, 85, 255, 255), QColor(255, 85, 255, 255),     QColor(85, 170, 255, 255), QColor(255, 170, 255, 255), QColor(85, 255, 255, 255), QColor(255, 255, 255, 255)}};ColorCombox::ColorCombox(QWidget *parent)    : QToolButton(parent){    setPopupMode(QToolButton::MenuButtonPopup);    setMenu(createColorMenu(SLOT(OnColorChanged()), SLOT(OnShowColorBoard())));    setAutoFillBackground(true);}ColorCombox::~ColorCombox(){}void ColorCombox::setButtonIcon(const QString &imageFile, QColor color){    setIcon(createColorToolButtonIcon(imageFile, color));}QMenu *ColorCombox::createColorMenu(const char *slot, const char *slotColorBoard){    // 设置透明色    QAction *pActionTransparent = new QAction(this);    pActionTransparent->setData(QColor(0, 0, 0, 0));    pActionTransparent->setText(tr("transparent_set"));    connect(pActionTransparent, SIGNAL(triggered()), this, slot);    QToolButton *pBtnTransparent = new QToolButton;    pBtnTransparent->setFixedSize(QSize(142, 16));    pBtnTransparent->setText(tr("transparent_set"));    pBtnTransparent->setDefaultAction(pActionTransparent);    // 选择其他颜色    QToolButton *pBtnOtherColor = new QToolButton;    pBtnOtherColor->setText(tr("other_color_set"));    pBtnOtherColor->setFixedSize(QSize(142, 20));    pBtnOtherColor->setAutoRaise(true);    pBtnOtherColor->setToolTip("other_color_set");    connect(pBtnOtherColor, SIGNAL(clicked()), this, slotColorBoard);    // 基本色    QGridLayout *pGridLayout = new QGridLayout;    pGridLayout->setAlignment(Qt::AlignCenter);    pGridLayout->setContentsMargins(0, 0, 0, 0);    pGridLayout->setSpacing(2);    for (int iRow = 0; iRow < 6; iRow++)    {        for (int iCol = 0; iCol < 8; iCol++)        {            QAction *action = new QAction(this);            action->setData(colors[iRow][iCol]);            action->setIcon(createColorIcon(colors[iRow][iCol]));            connect(action, SIGNAL(triggered()), this, slot);            QToolButton *pBtnColor = new QToolButton;            pBtnColor->setFixedSize(QSize(16, 16));            pBtnColor->setAutoRaise(true);            pBtnColor->setDefaultAction(action);            pBtnColor->setToolTip("white");            pGridLayout->addWidget(pBtnColor, iRow, iCol);        }    }    QWidget *widget = new QWidget;    widget->setLayout(pGridLayout);    QVBoxLayout *pVLayout = new QVBoxLayout;    pVLayout->addWidget(pBtnTransparent);    pVLayout->addWidget(widget);    pVLayout->addWidget(pBtnOtherColor);    QMenu *colorMenu = new QMenu(this);    colorMenu->setLayout(pVLayout);    return colorMenu;}QIcon ColorCombox::createColorToolButtonIcon(const QString &imageFile, QColor color){    QPixmap pixmap(16, 18);    pixmap.fill(Qt::transparent);    QPainter painter(&pixmap);    QPixmap image(imageFile);    QRect target(0, 0, 16, 16);    QRect source(0, 0, 16, 16);    painter.fillRect(QRect(0, 13, 16, 4), color);    painter.drawPixmap(target, image, source);    return QIcon(pixmap);    return QIcon("");}QIcon ColorCombox::createColorIcon(QColor color){    QPixmap pixmap(16, 16);    QPainter painter(&pixmap);    painter.setPen(Qt::NoPen);    painter.fillRect(QRect(0, 0, 16, 16), color);    return QIcon(pixmap);}void ColorCombox::OnColorChanged(){    QAction *pFillColorAction = new QAction(this);    pFillColorAction = qobject_cast<QAction *>(sender());    QColor color = qvariant_cast<QColor>(pFillColorAction->data());    this->menu()->close();    emit sigColorChanged(color);}void ColorCombox::OnShowColorBoard(){    this->menu()->close();    QColor color = QColorDialog::getColor(Qt::black, this);    if (!color.isValid())        return;    emit sigColorChanged(color);}