Qt：标准颜色对话框类QColorDialog选择某种颜色

雨点打透心脏的1/2处 2023-01-12 11:41 171阅读 0赞

1、新建"QT GUI"，基类选择"QDialog'，取消“创建界面”

2、dialog.cpp中：

#ifndef DIALOG_H
    #define DIALOG_H
    
    #include <QDialog>
    #include <QPushButton>
    #include <QFrame>
    #include <QGridLayout>
    class Dialog : public QDialog
    {
        Q_OBJECT
    
    public:
        Dialog(QWidget *parent = 0);
        ~Dialog();
    
    private:   //私有变量声明
        QPushButton *colorBtn;
        QFrame *colorFrame;
        QGridLayout *mainLayout;
    
    private slots:
        void showColor();
    };
    
    #endif // DIALOG_H

3、dialog.cpp中

#include "dialog.h"
    #include <QGridLayout>
    #include <QColorDialog>
    Dialog::Dialog(QWidget *parent)
        : QDialog(parent)
    {
        colorBtn = new QPushButton;
    
        //控件初始化
        colorBtn->setText(tr("颜色标准对话框"));
        colorFrame = new QFrame;
        colorFrame->setFrameShape(QFrame::Box);
        colorFrame->setAutoFillBackground(true);
        //布局管理
    
        mainLayout = new QGridLayout(this);
        mainLayout->addWidget(colorBtn, 1, 0);
        mainLayout->addWidget(colorFrame, 1, 1);
    
        //
        connect(colorBtn, SIGNAL(clicked()), this, SLOT(showColor()));
    }
    
    Dialog::~Dialog()
    {
    
    }
    
    void Dialog::showColor()
    {
        QColor c = QColorDialog::getColor(Qt::blue);
        if(c.isValid()){
            colorFrame->setPalette(QPalette(c));
        }
    }

4、效果

![效果图][f050f7c641cf71a511e68ebcf4643b19.png]

5、

QColor color = QColorDialog::getColor  
(const QColor&initial = Qt::white,  
QWidget \* parent = 0);

第一个参数:对话框打开时默认选择的颜色(QColor类型)  
第二个参数:它的parent

[f050f7c641cf71a511e68ebcf4643b19.png]: /images/20221119/0155e7a3c3a94eb7b7e92ae6585910c2.png