Qt-无边框窗口实现拖动和改变大小(Qt::FramelessWindowHint)
作者：互联网
相关资料：
https://blog.csdn.net/dragoo1/article/details/121163236 原文
代码实例：
.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 #include <QtGui>
7
8
9 #define EDGE_MARGIN 8
10
11 QT_BEGIN_NAMESPACE
12 namespace Ui { class MainWindow; }
13 QT_END_NAMESPACE
14
15 class MainWindow : public QMainWindow
16 {
17 Q_OBJECT
18
19 public:
20 explicit MainWindow(QWidget *parent = 0);
21 protected:
22 virtual void mouseMoveEvent(QMouseEvent * event);
23 virtual void mousePressEvent(QMouseEvent * event);
24 virtual void mouseReleaseEvent(QMouseEvent * event);
25 virtual void enterEvent(QEvent * event);
26 virtual void leaveEvent(QEvent * event);
27 private:
28 QPoint dragPosition; //鼠标拖动的位置
29 enum {nodir,
30 top = 0x01,
31 bottom = 0x02,
32 left = 0x04,
33 right = 0x08,
34 topLeft = 0x01 | 0x04,
35 topRight = 0x01 | 0x08,
36 bottomLeft = 0x02 | 0x04,
37 bottomRight = 0x02 | 0x08
38 } resizeDir; //更改尺寸的方向
39
40 private:
41 void testEdge(QMouseEvent *event); //检测鼠标是否接近窗口边缘
42
43
44 private:
45 Ui::MainWindow *ui;
46 };
47 #endif // MAINWINDOW_H
View Code
mainwindow.cpp
1 #include "mainwindow.h"
2 #include "ui_mainwindow.h"
3
4
5 #define min(a,b) ((a)<(b)? (a) :(b))
6 #define max(a,b) ((a)>(b)? (a) :(b))
7
8
9 MainWindow::MainWindow(QWidget *parent)
10 : QMainWindow(parent)
11 , ui(new Ui::MainWindow)
12 {
13 resizeDir = nodir; //初始化检测方向为无
14 setWindowFlags(Qt::FramelessWindowHint); //设置无边框
15 setMouseTracking(true); //开启鼠标追踪
16 setMinimumSize(90, 200);
17 }
18
19 void MainWindow::mousePressEvent(QMouseEvent * event)
20 {
21 if (event->button() == Qt::LeftButton) //每当按下鼠标左键就记录一下位置
22 {
23 dragPosition = event->globalPos() - frameGeometry().topLeft(); //获得鼠标按键位置相对窗口左上面的位置
24 }
25 }
26
27 void MainWindow::testEdge(QMouseEvent *event)
28 {
29 int diffLeft = event->globalPos().x() - frameGeometry().left(); //计算鼠标距离窗口上下左右有多少距离
30 int diffRight = event->globalPos().x() - frameGeometry().right();
31 int diffTop = event->globalPos().y() - frameGeometry().top();
32 int diffBottom = event->globalPos().y() - frameGeometry().bottom();
33
34 Qt::CursorShape cursorShape;
35
36 if(diffTop < EDGE_MARGIN && diffTop>=0){ //根据 边缘距离 分类改变尺寸的方向
37 if(diffLeft < EDGE_MARGIN && diffLeft>=0){
38 resizeDir = topLeft;
39 cursorShape = Qt::SizeFDiagCursor;
40 }
41 else if(diffRight > -EDGE_MARGIN && diffRight<=0){
42 resizeDir = topRight;
43 cursorShape = Qt::SizeBDiagCursor;
44 }
45 else{
46 resizeDir = top;
47 cursorShape = Qt::SizeVerCursor;
48 }
49 }
50 else if(abs(diffBottom) < EDGE_MARGIN && diffBottom<=0){
51 if(diffLeft < EDGE_MARGIN && diffLeft>=0){
52 resizeDir = bottomLeft;
53 cursorShape = Qt::SizeBDiagCursor;
54 }
55 else if(diffRight > -EDGE_MARGIN && diffRight<=0){
56 resizeDir = bottomRight;
57 cursorShape = Qt::SizeFDiagCursor;
58 }
59 else{
60 resizeDir = bottom;
61 cursorShape = Qt::SizeVerCursor;
62 }
63 }
64 else if(abs(diffLeft) < EDGE_MARGIN){
65 resizeDir = left;
66 cursorShape = Qt::SizeHorCursor;
67 }
68 else if(abs(diffRight) < EDGE_MARGIN){
69 resizeDir = right;
70 cursorShape = Qt::SizeHorCursor;
71 }
72 else{
73 resizeDir = nodir;
74 cursorShape = Qt::ArrowCursor;
75 }
76
77 QApplication::setOverrideCursor(cursorShape);
78 }
79
80 void MainWindow::mouseMoveEvent(QMouseEvent * event)
81 {
82 if (event->buttons() & Qt::LeftButton){ //如果左键是按下的
83 if(resizeDir == nodir){ //如果鼠标不是放在边缘那么说明这是在拖动窗口
84 move(event->globalPos() - dragPosition);
85 }
86 else{
87 int ptop,pbottom,pleft,pright; //窗口上下左右的值
88 ptop = frameGeometry().top();
89 pbottom = frameGeometry().bottom();
90 pleft = frameGeometry().left();
91 pright = frameGeometry().right();
92 if(resizeDir & top){ //检测更改尺寸方向中包含的上下左右分量
93 if(height() == minimumHeight()){
94 ptop = min(event->globalY(),ptop);
95 }
96 else if(height() == maximumHeight()){
97 ptop = max(event->globalY(),ptop);
98 }
99 else{
100 ptop = event->globalY();
101 }
102 }
103 else if(resizeDir & bottom){
104 if(height() == minimumHeight()){
105 pbottom = max(event->globalY(),ptop);
106 }
107 else if(height() == maximumHeight()){
108 pbottom = min(event->globalY(),ptop);
109 }
110 else{
111 pbottom = event->globalY();
112 }
113 }
114
115 if(resizeDir & left){ //检测左右分量
116 if(width() == minimumWidth()){
117 pleft = min(event->globalX(),pleft);
118 }
119 else if(width() == maximumWidth()){
120 pleft = max(event->globalX(),pleft);
121 }
122 else{
123 pleft = event->globalX();
124 }
125 }
126 else if(resizeDir & right){
127 if(width() == minimumWidth()){
128 pright = max(event->globalX(),pright);
129 }
130 else if(width() == maximumWidth()){
131 pright = min(event->globalX(),pright);
132 }
133 else{
134 pright = event->globalX();
135 }
136 }
137 setGeometry(QRect(QPoint(pleft,ptop),QPoint(pright,pbottom)));
138 }
139 }
140 else testEdge(event); //当不拖动窗口、不改变窗口大小尺寸的时候 检测鼠标边缘
141 }
142 void MainWindow::mouseReleaseEvent(QMouseEvent *event)
143 {
144 if(resizeDir != nodir){ //还原鼠标样式
145 testEdge(event);
146 }
147 }
148
149 void MainWindow::enterEvent(QEvent * event)
150 {
151 QWidget::enterEvent(event);
152 }
153
154 void MainWindow::leaveEvent(QEvent * event)
155 {
156 QApplication::setOverrideCursor(Qt::IBeamCursor);
157 QWidget::leaveEvent(event);
158 }
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：event,FramelessWindowHint,Qt,拖动,void,else,resizeDir,MainWindow 来源： https://www.cnblogs.com/FKdelphi/p/16450267.html