Qt 无边框窗口实现窗口阴影的两种方法

#include "testfenbianlv.h" #include <QTextEdit> #include <QDebug> #include <QScrollBar> #include <QFontMetrics> #pragma execution_character_set("utf-8") TestFenBianLv::TestFenBianLv(QWidget *parent) : QMainWindow(parent) { ui.setupUi(this); this->setAttribute(Qt::WA_TranslucentBackground, true); setWindowFlags(Qt::Window | Qt::FramelessWindowHint | Qt::WindowMinimizeButtonHint);//|Qt::WindowSystemMenuHint); } TestFenBianLv::~TestFenBianLv() { } void TestFenBianLv::paintEvent(QPaintEvent *event) { if (isMaximized()) { return; } int nShadowsWidth = 10; int nRadius = 6; QPainterPath path; path.setFillRule(Qt::WindingFill); path.addRoundedRect(nShadowsWidth, nShadowsWidth, this->width() - nShadowsWidth * 2, this->height() - nShadowsWidth * 2, nRadius, nRadius); QPainter painter(this); QColor color(0, 0, 0, 200); for (int i = 0; i < nShadowsWidth; i++) { QPainterPath path; path.setFillRule(Qt::WindingFill); path.addRoundedRect(nShadowsWidth - i, nShadowsWidth - i, this->width() - (nShadowsWidth - i) * 2, this->height() - (nShadowsWidth - i) * 2, nRadius + i, nRadius + i); color.setAlpha(120 - qSqrt(i) * 45); painter.setPen(color); painter.drawPath(path); } }