QMainWindow无标题栏和边框依然可以通过四周改变窗口大小

#include "mainwindow.h" #include "ui_mainwindow.h" #include "qevent.h" #include <Windows.h> #include <WindowsX.h> #define WINDOW_FRAME_BORDER 4 MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); this->setMouseTracking(true); } MainWindow::~MainWindow() { delete ui; } bool MainWindow::nativeEvent(const QByteArray &eventType, void *message, long *result) { return winEvent( (MSG*)message,result ); } bool MainWindow::winEvent(MSG *message, long *result) { switch(message->message) { case WM_NCHITTEST: int xPos = GET_X_LPARAM(message->lParam) - this->frameGeometry().x(); int yPos = GET_Y_LPARAM(message->lParam) - this->frameGeometry().y(); int nLeft = 0; int nTop = 0; int nRight = width(); int nBottom = height(); long flag = 0; if (topHeight + WINDOW_FRAME_BORDER > qAbs(nTop - yPos) && qAbs(nTop - yPos) > WINDOW_FRAME_BORDER) { *result = HTCAPTION; return true; } if( WINDOW_FRAME_BORDER > qAbs( nLeft - xPos ) ) { flag = HTLEFT; *result = HTLEFT; } if( WINDOW_FRAME_BORDER > qAbs( nRight - xPos ) ) { flag = HTRIGHT; *result = HTRIGHT; } if( WINDOW_FRAME_BORDER > qAbs( nTop - yPos ) ) { if (flag == HTLEFT) { *result = HTTOPLEFT; } else if(flag == HTRIGHT) { *result = HTTOPRIGHT; } else { flag = HTTOP; *result = HTTOP; } } if( WINDOW_FRAME_BORDER > qAbs( nBottom - yPos ) ) { if (flag == HTLEFT) { *result = HTBOTTOMLEFT; } else if (flag == HTRIGHT) { *result = HTBOTTOMRIGHT; } else { flag = HTBOTTOM; *result = HTBOTTOM; } } if (flag == 0) { return false; } return true; } return false; }