1.运行界面

2.源码 

//.h
#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>namespace Ui {
class Widget;
}class Widget : public QWidget
{Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();private:Ui::Widget *ui;};#endif // WIDGET_H//.cpp
#include "widget.h"
#include "ui_widget.h"
#include <QGraphicsDropShadowEffect>
#include <QColor>const int g_maxValue = 50;Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui->setupUi(this);this->setStyleSheet("background-color: rgb(255, 255, 255);");ui->frame->setStyleSheet("background-color: rgb(0, 0, 0);");ui->frame->setStyleSheet("border-radius:8px;");//设置具体阴影QGraphicsDropShadowEffect *shadow_effect = new QGraphicsDropShadowEffect(this);shadow_effect->setOffset(0, 0);//阴影颜色shadow_effect->setColor(QColor(38, 78, 119, 127));//阴影半径shadow_effect->setBlurRadius(22);ui->frame->setGraphicsEffect(shadow_effect);
}Widget::~Widget()
{delete ui;
}