#include "FrameResize.h"
#include <QMouseEvent>
#define min(a,b) ((a)<(b)? (a) :(b))
#define max(a,b) ((a)>(b)? (a) :(b))
FrameResize::FrameResize(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
this->setWindowFlags(Qt::FramelessWindowHint);
edgeMargin = 4; //设置检测边缘为4
resizeDir = nodir; //初始化检测方向为无
setMouseTracking(true); //开启鼠标追踪
ui.centralWidget->setLayout(ui.mainLayout);
}
void FrameResize::mousePressEvent(QMouseEvent *event)
{
event->ignore();
if (event->button() == Qt::LeftButton) //每当按下鼠标左键就记录一下位置
{
dragPosition = event->globalPos() - frameGeometry().topLeft(); //获得鼠标按键位置相对窗口左上面的位置
}
}
void FrameResize::mouseMoveEvent(QMouseEvent *event)
{
event->ignore();
if (event->buttons() & Qt::LeftButton) { //如果左键是按下的
if (resizeDir == nodir) { //如果鼠标不是放在边缘那么说明这是在拖动窗口
move(event->globalPos() - dragPosition);
}
else {
int ptop, pbottom, pleft, pright; //窗口上下左右的值
ptop = frameGeometry().top();
pbottom = frameGeometry().bottom();
pleft = frameGeometry().left();
pright = frameGeometry().right();
if (resizeDir & top) { //检测更改尺寸方向中包含的上下左右分量
if (height() == minimumHeight()) {
ptop = min(event->globalY(), ptop);
}
else if (height() == maximumHeight()) {
ptop = max(event->globalY(), ptop);
}
else {
ptop = event->globalY();
}
}
else if (resizeDir & bottom) {
if (height() == minimumHeight()) {
pbottom = max(event->globalY(), ptop);
}
else if (height() == maximumHeight()) {
pbottom = min(event->globalY(), ptop);
}
else {
pbottom = event->globalY();
}
}
if (resizeDir & left) { //检测左右分量
if (width() == minimumWidth()) {
pleft = min(event->globalX(), pleft);
}
else if (width() == maximumWidth()) {
pleft = max(event->globalX(), pleft);
}
else {
pleft = event->globalX();
}
}
else if (resizeDir & right) {
if (width() == minimumWidth()) {
pright = max(event->globalX(), pright);
}
else if (width() == maximumWidth()) {
pright = min(event->globalX(), pright);
}
else {
pright = event->globalX();
}
}
setGeometry(QRect(QPoint(pleft, ptop), QPoint(pright, pbottom)));
}
}
else
{
checkEdge(); //当不拖动窗口、不改变窗口大小尺寸的时候 检测鼠标边缘
}
}
void FrameResize::mouseReleaseEvent(QMouseEvent *event)
{
event->ignore();
if (resizeDir != nodir) { //还原鼠标样式
checkEdge();
}
}
void FrameResize::checkEdge()
{
int diffLeft = abs(cursor().pos().x() - frameGeometry().left()); //计算鼠标距离窗口上下左右有多少距离
int diffRight = abs(cursor().pos().x() - frameGeometry().right());
int diffTop = abs(cursor().pos().y() - frameGeometry().top());
int diffBottom = abs(cursor().pos().y() - frameGeometry().bottom());
QCursor tempCursor; //获得当前鼠标样式，注意:只能获得当前鼠标样式然后再重新设置鼠标样式
tempCursor = cursor(); //因为获得的不是鼠标指针，所以不能这样用:cursor().setXXXXX
if (diffTop < edgeMargin) { //根据 边缘距离 分类改变尺寸的方向
if (diffLeft < edgeMargin) {
resizeDir = topLeft;
tempCursor.setShape(Qt::SizeFDiagCursor);
}
else if (diffRight < edgeMargin) {
resizeDir = topRight;
tempCursor.setShape(Qt::SizeBDiagCursor);
}
else {
resizeDir = top;
tempCursor.setShape(Qt::SizeVerCursor);
}
}
else if (diffBottom < edgeMargin) {
if (diffLeft < edgeMargin) {
resizeDir = bottomLeft;
tempCursor.setShape(Qt::SizeBDiagCursor);
}
else if (diffRight < edgeMargin) {
resizeDir = bottomRight;
tempCursor.setShape(Qt::SizeFDiagCursor);
}
else {
resizeDir = bottom;
tempCursor.setShape(Qt::SizeVerCursor);
}
}
else if (diffLeft < edgeMargin) {
resizeDir = left;
tempCursor.setShape(Qt::SizeHorCursor);
}
else if (diffRight < edgeMargin) {
resizeDir = right;
tempCursor.setShape(Qt::SizeHorCursor);
}
else {
resizeDir = nodir;
tempCursor.setShape(Qt::ArrowCursor);
}
setCursor(tempCursor); //重新设置鼠标,主要是改样式
}
QT 隐藏标题栏后改变窗体大小
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2018-03-08
15:37:59
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收藏 10KB RAR 举报
Frame Resize.rar （12个子文件） 
Frame Resize Frame Resize 
FrameResize.h 758B Frame Resize.vcxproj.filters 3KB FrameResize.ui 3KB Resources FrameResize.qrc 71B main.cpp 181B FrameResize.cpp 4KB GeneratedFiles Release ui_FrameResize.h 4KB Debug moc_FrameResize.cpp 3KB qrc_FrameResize.cpp 1KB Frame Resize.vcxproj.user 629B Frame Resize.vcxproj 9KB Frame Resize.sln 956B资源评论
