相关资料：
https://blog.csdn.net/qq_22642239/article/details/120565343
.pro
1 QT += core gui
2
3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
4
5 CONFIG += c++11
6
7 # The following define makes your compiler emit warnings if you use
8 # any Qt feature that has been marked deprecated (the exact warnings
9 # depend on your compiler). Please consult the documentation of the
10 # deprecated API in order to know how to port your code away from it.
11 DEFINES += QT_DEPRECATED_WARNINGS
12
13 # You can also make your code fail to compile if it uses deprecated APIs.
14 # In order to do so, uncomment the following line.
15 # You can also select to disable deprecated APIs only up to a certain version of Qt.
16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
17
18 SOURCES += \
19 main.cpp \
20 mainwindow.cpp
21
22 HEADERS += \
23 mainwindow.h
24
25 FORMS += \
26 mainwindow.ui
27
28 # Default rules for deployment.
29 qnx: target.path = /tmp/$${TARGET}/bin
30 else: unix:!android: target.path = /opt/$${TARGET}/bin
31 !isEmpty(target.path): INSTALLS += target
View Code
main.cpp
1 #include "mainwindow.h"
2
3 #include <QApplication>
4
5 int main(int argc, char *argv[])
6 {
7 QApplication a(argc, argv);
8 MainWindow w;
9 w.show();
10 return a.exec();
11 }
View Code
mainwindow.h
1 #ifndef MAINWINDOW_H
2 #define MAINWINDOW_H
3
4 #include <QMainWindow>
5
6 QT_BEGIN_NAMESPACE
7 namespace Ui { class MainWindow; }
8 QT_END_NAMESPACE
9
10 class MainWindow : public QMainWindow
11 {
12 Q_OBJECT
13
14 public:
15 MainWindow(QWidget *parent = nullptr);
16 ~MainWindow();
17
18 protected:
19 //第一种方案是走windows自己的消息机制
20 virtual bool nativeEvent(const QByteArray &eventType, void *message, long *result);
21 private:
22 Ui::MainWindow *ui;
23 };
24 #endif // MAINWINDOW_H
View Code
mainwindow.cpp
1 #include "mainwindow.h"
2 #include "ui_mainwindow.h"
3
4 #include <QMouseEvent>
5 #include <qt_windows.h>
6 const int g_nBorder = 4;
7
8 MainWindow::MainWindow(QWidget *parent)
9 : QMainWindow(parent)
10 , ui(new Ui::MainWindow)
11 {
12 ui->setupUi(this);
13 this->setWindowFlags(Qt::FramelessWindowHint);
14 setMouseTracking(true);
15 }
16
17 MainWindow::~MainWindow()
18 {
19 delete ui;
20 }
21
22 bool MainWindow::nativeEvent(const QByteArray &eventType, void *message, long *result)
23 {
24 MSG* pMsg = (MSG*)message;
25 switch (pMsg->message)
26 {
27 case WM_NCHITTEST:
28 {
29 QPoint pos = mapFromGlobal(QPoint(LOWORD(pMsg->lParam), HIWORD(pMsg->lParam)));
30 bool bHorLeft = pos.x() < g_nBorder;
31 bool bHorRight = pos.x() > width() - g_nBorder;
32 bool bVertTop = pos.y() < g_nBorder;
33 bool bVertBottom = pos.y() > height() - g_nBorder;
34 if (bHorLeft && bVertTop)
35 *result = HTTOPLEFT;
36 else if (bHorLeft && bVertBottom)
37 *result = HTBOTTOMLEFT;
38 else if (bHorRight && bVertTop)
39 *result = HTTOPRIGHT;
40 else if (bHorRight && bVertBottom)
41 *result = HTBOTTOMRIGHT;
42 else if (bHorLeft)
43 *result = HTLEFT;
44 else if (bHorRight)
45 *result = HTRIGHT;
46 else if (bVertTop)
47 *result = HTTOP;
48 else if (bVertBottom)
49 *result = HTBOTTOM;
50 else
51 return false;
52 return true;
53 }
54 break;
55 default:
56 break;
57 }
58 return QWidget::nativeEvent(eventType, message, result);
59 }
View Code
mainwindow.ui
1 <?xml version="1.0" encoding="UTF-8"?> 2 <ui version="4.0"> 3 <class>MainWindow</class> 4 <widget class="QMainWindow" name="MainWindow"> 5 <property name="geometry"> 6 <rect> 7 <x>0</x> 8 <y>0</y> 9 <width>800</width> 10 <height>600</height> 11 </rect> 12 </property> 13 <property name="windowTitle"> 14 <string>MainWindow</string> 15 </property> 16 <widget class="QWidget" name="centralwidget"/> 17 <widget class="QMenuBar" name="menubar"> 18 <property name="geometry"> 19 <rect> 20 <x>0</x> 21 <y>0</y> 22 <width>800</width> 23 <height>22</height> 24 </rect> 25 </property> 26 </widget> 27 <widget class="QStatusBar" name="statusbar"/> 28 </widget> 29 <resources/> 30 <connections/> 31 </ui>View Code
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<iframe></iframe> 标签：include,Qt,nativeEvent,MainWindow,拖动,ui,result,else,mainwindow From： https://www.cnblogs.com/FKdelphi/p/17103006.html